Message-ID: <386B9079.69846A2E@wfubmc.edu> From: tcullen@wfubmc.edu To: "J.Y.Methven" Cc: Linac Engineering List Subject: Re: A Professional Society - UK Style Date: Thu, 30 Dec 1999 09:03:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, very impressive document. It has a way of legitimizing the need for a society here in the USA, by showing there is a need to develop an entry point into this profession other than the manufacturer or laterally moving into it from the radiology/biomedical fields. The formal education path and strategy of training will produce extremely knowledgeable engineers, but I also like the way they covered all avenues for entry into the profession, other than education only. The ability to advance or use this training and education in multiple fields of the profession is also appealing. Happy New Year "J.Y.Methven" wrote: > The Institute of Physics and Engineering in Medicine (IPEM) is the United > Kingdom's professional organisation for engineers, technologists and > technicians working in radiotherapy. > > IPEM has recently published a consultation document on the education and > training of Clinical Technologists specialising in physics and engineering > in health care. Included in this document are detailed proposals for > education and training in both radiotherapy physics and radiotherapy > technology. Comments are actively encouraged. > > You may access a copy of the proposals at the IPEM web site > http://www.ipem.org.uk simply click on the > box marked "Consultation - Draft Proposals for Proposed Clinical > Technologist Training". > > The closing date for comment is Monday 28th February 2000. > > Information on membership categories and how to join IPEM may also be > obtained from the web site. > > Jim Methven > Chair, IPEM Clinical Technologists Education and Training Panel ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dose rate, EXQ2 Message-ID: <386B84EC.64CF840F@wfubmc.edu> From: tcullen@wfubmc.edu To: "Villegas, Jose" Cc: linac-eng@plato1.aristotle.net Subject: Re: Dose rate, EXQ2 Date: Thu, 30 Dec 1999 08:14:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jose, during the period leading up to the EXQ2 I/L, do you see any change in the symmetry meter? You did not mention if this is taking place during a dynamic or static treatment either. You can start with the beam position servo pcb in the cardrack, then the steering amp in the aux electronics. This may sound like a dumb ? but have you tried just tuning the dose rate in service mode, and if so, does it still give the EXQ2? Happy New Year, you know I bet if every computer on the planet melted down because of this Y2K thing, the only one left standing would be the one with my mortgage payment on it. The other question on registration can be looked into here. World Congress on Medical Physics and Biomedical Engineering The Linac Eng meeting is not listed but an earlier post (below)had the info you requested. The meeting will be held on Saturday and Sunday, July 22-23, 2000, just prior to the 2000 World Congress on Medical Physics and Biomedical Engineering and the AAPM Annual Meeting. The meeting will take place at the AAPM host hotel, the Sheraton Chicago. Hotel rooms should be reserved prior to the housing registration deadline, June 23. Advanced registration will cost $50, and registration after June 1 will cost $100. Details regarding registration and housing can be obtained from Farhana Khan in the AAPM office (phone: 301-209-3375 or email: farhana@aapm.org). For those interested in attending the World Congress following this meeting, registration is available on a daily and weekly basis, and information can be accessed through the internet at http://www.wc2000.org . "Villegas, Jose" wrote: Having problem with Hi, and Low X, Low dose rate and EXQ2, only on Photons, all the electrons are fine Measured Target current, below normal value, phase to phase voltage line ok. any suggestions? Jose R. Villegas Clinical Engineer Radiation/Oncology The University of Massachusetts Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dose rate, EXQ2 Message-ID: <85256857.00523259.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net, villegaj@ummhc.org Subject: Re: Dose rate, EXQ2 Date: Thu, 30 Dec 1999 06:57:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Is the position servo on? How many MU are delivered before it trips the interlock? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Dose rate, EXQ2 Message-ID: <77279C4E0878D2118B860000F8085C8B015BDC6D@hcunivexch02.ummhc.org> From: "Villegas, Jose" To: 'Linear Accelereator submissions' Subject: Dose rate, EXQ2 Date: Thu, 30 Dec 1999 06:08:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Having problem with Hi, and Low X, Low dose rate and EXQ2, only on Photons, all the electrons are fine Measured Target current, below normal value, phase to phase voltage line ok. any suggestions? Jose R. Villegas Clinical Engineer Radiation/Oncology The University of Massachusetts Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: A Professional Society - UK Style Message-ID: <004501bf52c9$589001c0$427abcbc@pc1950> From: "J.Y.Methven" To: Linac Engineering List Subject: A Professional Society - UK Style Date: Thu, 30 Dec 1999 05:25:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The Institute of Physics and Engineering in Medicine (IPEM) is the United Kingdom's professional organisation for engineers, technologists and technicians working in radiotherapy. IPEM has recently published a consultation document on the education and training of Clinical Technologists specialising in physics and engineering in health care. Included in this document are detailed proposals for education and training in both radiotherapy physics and radiotherapy technology. Comments are actively encouraged. You may access a copy of the proposals at the IPEM web site http://www.ipem.org.uk simply click on the box marked "Consultation - Draft Proposals for Proposed Clinical Technologist Training". The closing date for comment is Monday 28th February 2000. Information on membership categories and how to join IPEM may also be obtained from the web site. Jim Methven Chair, IPEM Clinical Technologists Education and Training Panel ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Chicago Meeting... Message-ID: <4.1.19991230005353.0096cbd0@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: RE: Chicago Meeting... Date: Wed, 29 Dec 1999 21:58:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, even though you're jjoking, I agree with you. The question is, how to make this a credible case, so administrators everywhere will buy into it. Maybe the local physicists will help each of us do this. Anybody have other ideas? John At 12:37 PM 12/29/99 -0600, Richard Kimball wrote: >Cheap at twice the price... >Ask admin to pay for this. >Explain that this is a benefit to them having you affiliated with such a >fine organization, >and that you saved them that much simply repairing that last PWM board >instead of purchasing a new one at ~$1500. > >Richard L. Kimball >Chief Clinical Engineer >Department of Radiation & Cellular Oncology >The University of Chicago Hospitals >Tel. 773.702.6879 > > > >-----Original Message----- >From: tcullen@wfubmc.edu [mailto:tcullen@wfubmc.edu] >Sent: Wednesday, December 29, 1999 10:30 AM >To: Linac Engineers (E-mail) >Subject: Chicago Meeting > > >I did a quick estimate of what the meeting would cost if I go, and it >will be an expensive weekend at ~ $900US. This is the advance >registration $50, the airfare~$300, the housing $178x2, and food/ground >transportation picking up the rest. This does not include anything other >than the Linac Eng meeting, so if you wanted to browse the World >Congress exhibit hall, you would have to kick in another day or so plus >more registration fees. I used the Sheraton's rate of $178, because this >is where the AAPM HQ will be and for convenience. There are less >expensive hotels, and airfare rates are unpredictable, could be a lot >more could be less. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <77279C4E0878D2118B860000F8085C8B015BDC6C@hcunivexch02.ummhc.org> From: "Villegas, Jose" To: 'Linear Accelereator submissions' Subject: Date: Wed, 29 Dec 1999 12:25:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Can anybody tell me when is the Linac Engineers conference taking place?, and how could I get register for it Jose R. Villegas Clinical Engineer Radiation/Oncology The University of Massachusetts Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Chicago Meeting... Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D84D@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'tcullen@wfubmc.edu'" , "Linac Engineers (E-mail)" Subject: RE: Chicago Meeting... Date: Wed, 29 Dec 1999 10:37:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Cheap at twice the price... Ask admin to pay for this. Explain that this is a benefit to them having you affiliated with such a fine organization, and that you saved them that much simply repairing that last PWM board instead of purchasing a new one at ~$1500. Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: tcullen@wfubmc.edu [mailto:tcullen@wfubmc.edu] Sent: Wednesday, December 29, 1999 10:30 AM To: Linac Engineers (E-mail) Subject: Chicago Meeting I did a quick estimate of what the meeting would cost if I go, and it will be an expensive weekend at ~ $900US. This is the advance registration $50, the airfare~$300, the housing $178x2, and food/ground transportation picking up the rest. This does not include anything other than the Linac Eng meeting, so if you wanted to browse the World Congress exhibit hall, you would have to kick in another day or so plus more registration fees. I used the Sheraton's rate of $178, because this is where the AAPM HQ will be and for convenience. There are less expensive hotels, and airfare rates are unpredictable, could be a lot more could be less. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Chicago Meeting Message-ID: <386A36F6.339A469@wfubmc.edu> From: tcullen@wfubmc.edu To: "Linac Engineers (E-mail)" Subject: Chicago Meeting Date: Wed, 29 Dec 1999 08:29:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I did a quick estimate of what the meeting would cost if I go, and it will be an expensive weekend at ~ $900US. This is the advance registration $50, the airfare~$300, the housing $178x2, and food/ground transportation picking up the rest. This does not include anything other than the Linac Eng meeting, so if you wanted to browse the World Congress exhibit hall, you would have to kick in another day or so plus more registration fees. I used the Sheraton's rate of $178, because this is where the AAPM HQ will be and for convenience. There are less expensive hotels, and airfare rates are unpredictable, could be a lot more could be less. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: RT100 Message-ID: <9912290406.AB24447@yoyo.rah.sa.gov.au> From: Andrew Frolov To: 'Linac Eng List' , John Macmillan Cc: "'medical-physics-engineering@mailbase.ac.uk'" Subject: Re: RT100 Date: Tue, 28 Dec 1999 19:46:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" From: John Macmillan > > Good News: They may be able to recondition the tube in Hamburg. But I > am still awaiting details and price." > > BAD NEWS: Philips cannot recon or provide a replacement - end of > story. > > Has anyone got a spare tube? > > Regards > > John Macmillan > Radiotherapy Physics > Royal Shrewsbury Hospital > UK This is the most unusual suggestion as we have just bought a replacement tube for our RT100 from Philips via their agent in Australia. It is not exactly the same and required a minor modification to the machine. It came with a comprehensive manual and took us only one day to complete changeover. It comes as an assembly with the housing TRC100/HT101 p/n 9890 000 03001. The cost was US$26000.00. A bit expensive, but it works. So, push harder unless you wanted an insert only. Regards, Andrew Frolov Manager, Radiation Engineering Medical Physics Royal Adelaide Hospital Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian HE Carrousel Message-ID: <002d01bf5183$c929f900$c8c6d6d8@pavilion> From: Richard Reply-To: Richard To: "Linac-Eng (E-mail)" Subject: Varian HE Carrousel Date: Tue, 28 Dec 1999 14:34:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank to all who responded. The need was immediate, as the unit wouldn't lose calibration, just refused to move all the time. We removed the lead to expose the front part of the chain, and then sprayed a tri-flo type of cleaner while vacuuming up the wash a few centimeters away, while rotating. Afterwards, we wick up any residual lube/cleaner with kimwipes. The carrousel movement became EXTREMELY easy. We cal'd and tested all angles/energies etc. No more problem. BTW the chain did have some gunk on it which looked like old graphite lube. Cheers, Rich Kimball ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Group Message-ID: <6CE096D0CDF4D211A3110008C75D07523603D8@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: Group Date: Tue, 28 Dec 1999 10:23:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" While I applaud the efforts of those trying to get a professional organization started for linac engineers, I will not be jetting off to Chicago and staying in the Sheraton for a two day conference until I start getting paid like a doctor or physicist. Good luck to those of you who can afford it or work for a hospital that will pay your way. Until then I will occasionally play the lottery. All opinions expressed are purely my own. Dan Watters Radiology Engineer ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian HE Carrousel Message-ID: <3868F248.86E1059B@scf.sk.ca> From: S Thiesson To: "Lapenna, Russ" Cc: 'LINAC-ENG' Subject: Re: Varian HE Carrousel Date: Tue, 28 Dec 1999 09:24:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Our machine is a 2100C3 serial number is 1015, sorry for the the omission. Scot Thiesson "Lapenna, Russ" wrote: > We had the same problem with both our 2100's s/n 330 and 331. It > turned out that the original motor was not good enough for the job over the > long haul and after a while gave us intermittent problems that progressively > got worse. Shortly thereafter there was a retro from Varian. Depending on > your s/n this could be your problem. > > Russ LaPenna E.E.T. > Hamilton Regional Cancer Centre > > > > Having trouble with movement of a C2 series carrousel. > > > Erratic movement and overshoot of ports. I don't think it > > is a pot or motor > > > or motor driver. > > > Could be the bearing is dirty or has metal particles in it? > > > Has anyone flushed this bearing, and, if so....how? > > > > > > Thanks, > > > > > > Richard L. Kimball > > > Chief Clinical Engineer > > > Department of Radiation & Cellular Oncology > > > The University of Chicago Hospitals > > > Tel. 773.702.6879 > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian HE Carrousel Message-ID: <0.f5c3eb2e.259a45ad@aol.com> From: Virago1100@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Varian HE Carrousel Date: Tue, 28 Dec 1999 08:56:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, We just went thru a very similar problem last week. Carrousel was jerky and would tend to overshoot holes during calibration, sometimes would calibrate OK but then next time wouldn't. This all started after the motor drive transistor had shorted and spun the carrousel at hyper speed :-( After repairing the board we then noticed the jerky motion and over shooting. Given the nature of the failure, we replaced the pot but still had the same symptoms......We lubricated the carrousel and all the switches checked out OK, ultimately a new motor fixed the problem. If you remove the center piece of lead at the front of the gantry you can gain access to the carrousel bearing to flush and lubricate it. I've had good luck flushing the bearing with a little WD-40 then lubricating it with a little Super Lube or similar, don't over do it with the lubricant. Jim McKenzie ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian HE Carrousel Message-ID: From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: RE: Varian HE Carrousel Date: Tue, 28 Dec 1999 08:32:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had the same problem with both our 2100's s/n 330 and 331. It turned out that the original motor was not good enough for the job over the long haul and after a while gave us intermittent problems that progressively got worse. Shortly thereafter there was a retro from Varian. Depending on your s/n this could be your problem. Russ LaPenna E.E.T. Hamilton Regional Cancer Centre > > Having trouble with movement of a C2 series carrousel. > > Erratic movement and overshoot of ports. I don't think it > is a pot or motor > > or motor driver. > > Could be the bearing is dirty or has metal particles in it? > > Has anyone flushed this bearing, and, if so....how? > > > > Thanks, > > > > Richard L. Kimball > > Chief Clinical Engineer > > Department of Radiation & Cellular Oncology > > The University of Chicago Hospitals > > Tel. 773.702.6879 > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian HE Carrousel Message-ID: <3868E26B.7BD9D107@scf.sk.ca> From: S Thiesson To: Richard Kimball Cc: 'Linac Engineer ListServ' Subject: Re: Varian HE Carrousel Date: Tue, 28 Dec 1999 08:16:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Richard. We had a similar problem that turned out to be just a lack of lubrication. The chain didn't make the turn at the motor easy enough and as a result the extra tension was causing the pot to shake a bit at start up and slow down. This resulted in a very erratic, surging type of motion. We were stumped for the longest time because the chain seemed O.K. when we rotated it by hand. We only cured the problem by resorting to lubrication as a last resort. We removed the chain and cleaned it in an ultrasonic bath. The flexibility difference before and after was quite remarkable. We then lubricated it with a very light application of WD 40, which was all we had at the time. I think the next time we remove it we will use a silicone based lubricant. Hope this helps. Scot Thiesson A.B.C.C. Regina Sask. Canada sthiesson@scf.sk.ca Richard Kimball wrote: > Having trouble with movement of a C2 series carrousel. > Erratic movement and overshoot of ports. I don't think it is a pot or motor > or motor driver. > Could be the bearing is dirty or has metal particles in it? > Has anyone flushed this bearing, and, if so....how? > > Thanks, > > Richard L. Kimball > Chief Clinical Engineer > Department of Radiation & Cellular Oncology > The University of Chicago Hospitals > Tel. 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian HE Carrousel Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D84B@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: Varian HE Carrousel Date: Tue, 28 Dec 1999 07:41:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Having trouble with movement of a C2 series carrousel. Erratic movement and overshoot of ports. I don't think it is a pot or motor or motor driver. Could be the bearing is dirty or has metal particles in it? Has anyone flushed this bearing, and, if so....how? Thanks, Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Water Lines Message-ID: <00ac01bf513f$6e1f5580$3d0000c0@att.net.worldnet.att.net> From: Kevin Pueschel Reply-To: Kevin Pueschel To: linac-eng@plato1.aristotle.net Subject: Water Lines Date: Tue, 28 Dec 1999 06:25:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" While the list is deep into the discussion of water problems, Has anybody found a hose material that will last in a high radiation area significantly longer than the rubber hoses that are now in use in varian machines? The best substance that I've been able to find so far is reinforced ether based polyurethane. The Chemical Resistance Guide for Elastomers II rates this material for 50,000,000 RADS. Is there any other material used which can exceed that? Thanks for your input. Kevin Pueschel ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Ximatron CT Message-ID: From: Kerry Clark To: linac-eng@plato1.aristotle.net Subject: RE: Ximatron CT Date: Sun, 26 Dec 1999 13:44:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Frank, the error codes for the Ximatron in the operators manual are more up to date, but are terrible in the way of recommended actions. Error 816 actually is error 800 +16, which if you look at the operators manual says to see error 640, which as recommended actions says to reboot the system, re-attempt operation, then call service! (not a great deal of help I know). We recently had an 800 +32 error (ROTATION error), which with Varian's help was tracked down to being the cable in the windup between the encoder board and the camera control unit. I can't help much more with your error 816, we only found our 832 by slowly working through the system. Have fun. Kerry. > -----Original Message----- > From: fsherid@banet.net [SMTP:fsherid@banet.net] > Sent: Friday, 24 December 1999 15:25 > To: linac-eng@plato1.aristotle.net > Subject: Ximatron CT > > Hi: > > I would appreciate any insight with the > following problem on a xim with the CT > option. > When trying to initialize for a scan it > displays: "error while scanning" > and "dp_collect(patient)failed:-816" > The error codes in the manual say > 812-850 are spares. > > Thankyou in advance for ANY > insight into error code 816. > > Frank ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fwd:World Conference on Med Physics and Biomed Eng Message-ID: <4.1.19991105012706.0093ede0@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Fwd:World Conference on Med Physics and Biomed Eng Date: Mon, 27 Dec 1999 19:21:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Regards and happy holidays to all on the list. Here's more info about the Big event in Chicago next July which our organizational meeting is being tagged onto. I hope to see many of you there. John Somers >>Subject: Call for Papers - WC on Med Physics and Biomed Eng >> >>CALL FOR PAPERS >> >>Chicago 2000 >>World Congress on Medical Physics and Biomedical Engineering >>July 23 - 28, 1999 >>Chicago, Illinois, USA >> >>Meeting registration and abstract submission is now available via the >>Internet only. >> >>The deadline for abstract submission is January 14, 2000. >> >>All necessary information is available at >> >>http://www.wc2000.org >> >>Chicago 2000 World Congress Headquarters >>wc2000@wc2000.org >>One Physics Ellipse >>College Park, MD 20740-3846 >>(301) 209-3350 >>(301) 209-0862 fax >> >>Incorporating: >>19th International Conference on Medical and Biological Engineering >>12th International Conference on Medical Physics >>22nd International Conference of IEEE-EMBS >>42nd Annual Meeting of the American Association of Physicists in Medicine >> >>Organized by: >>International Union for Physics and Engineering in Medicine (IUPEM) >>International Organization for Medical Physics (IOMP) >>International Federation for Medical and Biological Engineering (IFMBE) >>International Federation of Engineers in Medicine and Biology (IFEMB) >>American Association of Physicists in Medicine (AAPM) >>American Institute for Medical and Biological Engineering (AIMBE) >>Engineering in Medicine and Biology Society of IEEE (IEEE-EMBS) >> >> >> ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian CR MLC IPSN faults Message-ID: <88256854.005F0341.00@ntip01.swedish.org> From: Chris.Coyle@mail.swedish.org To: Richard Kimball Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian CR MLC IPSN faults Date: Mon, 27 Dec 1999 09:16:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" IPSN = Leaf position outside tolerance or The Controller is off. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Ximatron CT Message-ID: From: Kerry Clark To: linac-eng@plato1.aristotle.net Subject: RE: Ximatron CT Date: Sun, 26 Dec 1999 13:44:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Frank, the error codes for the Ximatron in the operators manual are more up to date, but are terrible in the way of recommended actions. Error 816 actually is error 800 +16, which if you look at the operators manual says to see error 640, which as recommended actions says to reboot the system, re-attempt operation, then call service! (not a great deal of help I know). We recently had an 800 +32 error (ROTATION error), which with Varian's help was tracked down to being the cable in the windup between the encoder board and the camera control unit. I can't help much more with your error 816, we only found our 832 by slowly working through the system. Have fun. Kerry. > -----Original Message----- > From: fsherid@banet.net [SMTP:fsherid@banet.net] > Sent: Friday, 24 December 1999 15:25 > To: linac-eng@plato1.aristotle.net > Subject: Ximatron CT > > Hi: > > I would appreciate any insight with the > following problem on a xim with the CT > option. > When trying to initialize for a scan it > displays: "error while scanning" > and "dp_collect(patient)failed:-816" > The error codes in the manual say > 812-850 are spares. > > Thankyou in advance for ANY > insight into error code 816. > > Frank ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Bmag water flow Message-ID: <0.32d67db4.25944a3f@aol.com> From: MLancaster@aol.com To: linac-eng@plato1.aristotle.net Subject: RE: Bmag water flow Date: Thu, 23 Dec 1999 20:02:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just an update to the list; the problem was the guide flow restrictor, the 1 gpm total for all 4 bmag coils does appear to be more than enough. Thanks for all the help. Mike Lancaster ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron CT Message-ID: <3862D98A.722D29D2@banet.net> From: fsherid@banet.net Reply-To: fsherid@banet.net To: linac-eng@plato1.aristotle.net Subject: Ximatron CT Date: Thu, 23 Dec 1999 18:25:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi: I would appreciate any insight with the following problem on a xim with the CT option. When trying to initialize for a scan it displays: "error while scanning" and "dp_collect(patient)failed:-816" The error codes in the manual say 812-850 are spares. Thankyou in advance for ANY insight into error code 816. Frank ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DMS1 Data Message-ID: <002001bf4d8f$12c7a880$107011ce@medtech-solutio> From: Francis Tiss To: Chris.C.Coley@erhc-tr.nthames.nhs.uk Cc: linac-eng@plato1.aristotle.net Subject: Re: DMS1 Data Date: Thu, 23 Dec 1999 13:43:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, When a Lantis computer is connected to a Conventional Mevatron, there is a Special PCB manufactured by Siemens in the computer, which combines the DMS 1 and DMS 2 data and transfers it to the serial port. Have you got this PCB? If not, you may need to get this PCB from Siemens Regards Francis Tiss Medtech Solutions -----Original Message----- From: Chris.C.Coley@erhc-tr.nthames.nhs.uk To: linac-eng@plato1.aristotle.net Date: Tuesday, 21 December 1999 23:02 Subject: DMS1 Data >Help ! > >We are trying to connect our Siemens Mevatron (Conventional) to the Helax >Visir verification system. The problem is the Helax Visir does not recognise >the DMS1 data. If we attach a current loop converter to a PC and look at the >data, we get a string of letters instead of numbers. > ie ___PPPRQYPPPRPPPPQYQQYQSQQQS___PPPRQYPPPRPPPPQYQQYQSQQQS___ >Using the CDR program from Siemens, again we get letters. > >Normally I would have said okay we have a fault, but the protractor and our >existing punch card verification system receive the same data. They work >fine. > >Has anyone got any ideas as to wheather we have a fault or a strange protocol >???? > >Chris > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: High Voltage Diodes Message-ID: <38622652.45001BD@wfubmc.edu> From: tcullen@wfubmc.edu To: Keith Croft Cc: 'Linac eng' Subject: Re: High Voltage Diodes Date: Thu, 23 Dec 1999 05:40:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" uhhh.... let me guess, it cost more, right? It's probably a single component, maybe potted, oh well, even in the data book they talk about substituting this part for item 11, .53HVM7.5, if needed... but my god man, don't leave us hanging before the holidays! Keith Croft wrote: > Quizz question, > > The high voltage diodes CDB7.5 used in the modulator of the Varian 2100C are > no longer available from Varian, they have been replaced with another > component. > > What is this other component? > > Thanks, > > Keith. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: High Voltage Diodes Message-ID: <0.49ede65e.2592f5c2@aol.com> From: Accelinear@aol.com To: KeithC@midcentral.co.nz, Linac-eng@plato1.aristotle.net Subject: Re: High Voltage Diodes Date: Wed, 22 Dec 1999 19:49:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The only "door bell" diode unavailable in the open market I believe is the 15K style. Though I'm sure used ones are around. For those of you who may be unfamiliar, high voltage diodes are marked with the manufacturer's trademark first, then current rating, then voltage rating. A Unitrode (one of several manufacturers) diode such as a UDB 7.5 is a Unitrode diode, "B" current rating which I believe to be 1/4 amp, at 7.5Kvolts. Manufacturer is of no consequence with these diodes. Technical Opitions of Georgia stocks each of the diodes used in Varian linacs. While the 7.5 is no problem the 15s are no longer available. All one needs to do though is replace a 15 (Varian used A15 in some early modulators) with two 7.5s of the same current rating (in this case A). One is always safe in using a higher rated diode, voltage or current, than the original. One other note. If one set of diodes fail (short) in a rectifier array, replace the entire array. The others will have been stressed and are very likely to fail. Marty Shapiro, Technical Opitions of Georgia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: High Voltage Diodes Message-ID: <00BE56E17E26D11197CB00805FA6803A023BB53B@mail.midcentral.co.nz> From: Keith Croft To: 'Linac eng' Subject: High Voltage Diodes Date: Wed, 22 Dec 1999 17:51:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Quizz question, The high voltage diodes CDB7.5 used in the modulator of the Varian 2100C are no longer available from Varian, they have been replaced with another component. What is this other component? Thanks, Keith. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian CR MLC IPSN faults Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D847@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: Varian CR MLC IPSN faults Date: Wed, 22 Dec 1999 13:08:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are experiencing IPSN faults during IMRT approximately half way through the treatment. A check of all leaf motors and carriage movements show all is well. Thoughts? regards, Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel-773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Bmag flow Message-ID: <0.beed6110.25925a70@aol.com> From: Acceletronics@aol.com To: linac-eng@plato1.aristotle.net Subject: Bmag flow Date: Wed, 22 Dec 1999 08:46:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, If the problem is the flow restrictor, chances are its unseated and cocked at an angle - All you'd need to do in that case is reseat it, reassemble and test. If you do need one, Acceletronics carries them in stock and you can order it online as well. When doing a parts search with us either online or via phone, all you need is the part name such as "flow restrictor" or "restrictor" and our database will list those items we carry that contain that name. Please feel free to call us at 800-626-8704 - our parts people are service folks who have actually worked on and serviced linear accelerators and can help you find whatever it is your looking for - with or without a part number. Or try our online parts database at www.acceletronics.com. We guarantee your satisfaction and will meet or beat any other parts supplier's pricing if it is not below our own cost. Have a great Holiday! Steve Schwarz, Acceletronics ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water flow through Varian bend magnet coils Message-ID: <002d01bf4c86$3a49b1a0$7a2a56d1@default> From: clyde To: MLancaster@aol.com Cc: Linac Engineers Subject: Re: water flow through Varian bend magnet coils Date: Wed, 22 Dec 1999 06:09:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The flow should be much more. I never measured the rate but I have turned on the pump to do flow checks and a substantial amount of water is displaced. Were the old hoses clogged? I would suggest that you use some compressed air and ensure that the lines are clear. Is it possible you have a bent copper line or lines? Is this Mike ? Daryl Knox ----- Original Message ----- From: To: Sent: Wednesday, December 22, 1999 12:09 AM Subject: water flow through Varian bend magnet coils > Have any of you ever measured the flow rate for the water through Varian bend > magnet coils? We checked it on a Clinac 1800 today and it appears to be only > about 0.25 gpm per coil (1gpm total). This doesn't seem like it would be > enough flow but it also seems unlikely that all four coils would be > restricted (especially an equal amount). The hoses are new and the 1/2" hose > supplying the bend magnet supply manifold has much more than 1 gpm if it is > checked by itself. > > And yes, the machine is not closing the flow switch for the loop which > includes the magnet. > > Thanks in advance... > > Mike Lancaster > OMS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water flow through Varian bend magnet coils Message-ID: <001701bf4c85$351b34c0$b5086520@oem773> From: KENNETH R WRIGHT To: MLancaster@aol.com, "@plato1 (E-mail)" Subject: Re: water flow through Varian bend magnet coils Date: Wed, 22 Dec 1999 06:01:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, Your BMAG flow is normal. If you are getting Flow faults, try the Hays 7.0 GPM flow restrictor (regulator) coming off of the Supply manifold. I couldn't find the part number in the book but Technical Options of Georgia found it for me: 27-198934-00 and they have it in stock. Ken Wright ----- Original Message ----- From: To: Sent: Wednesday, December 22, 1999 12:09 AM Subject: water flow through Varian bend magnet coils > Have any of you ever measured the flow rate for the water through Varian bend > magnet coils? We checked it on a Clinac 1800 today and it appears to be only > about 0.25 gpm per coil (1gpm total). This doesn't seem like it would be > enough flow but it also seems unlikely that all four coils would be > restricted (especially an equal amount). The hoses are new and the 1/2" hose > supplying the bend magnet supply manifold has much more than 1 gpm if it is > checked by itself. > > And yes, the machine is not closing the flow switch for the loop which > includes the magnet. > > Thanks in advance... > > Mike Lancaster > OMS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: professional society Message-ID: <000501bf4c84$745fe960$7a2a56d1@default> From: clyde To: Tim Cullen Cc: Linac Engineers Subject: Re: professional society Date: Wed, 22 Dec 1999 05:57:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I agree. Nothing but good can come of this. Looking forward to good things happening at the y2k. Daryl Knox ----- Original Message ----- From: Tim Cullen To: Cc: ; Sent: Tuesday, December 21, 1999 4:39 PM Subject: Re: professional society > Tim, thanks for your persistence in this matter and congratulations to members of the list server group in showing an undying interest in the > formation of such a society. Nothing but good will come of it. I look forward to putting faces with names in July. > Dr. Hogstrom, thank you for your assistance and time. This is very good news for the new millennium. > > > Happy Holidays to All > > > > twaldron@mail.mdanderson.org wrote: > > > Dear colleagues and fellow linac-fixers: > > > > The notion of a professional society for linac-fixing types is a topic that has > > come up time and again in this forum. The following is an invitiation from the > > AAPM to act as a facilitator to us in this endeavor. Dr. Hogstrom, as president > > of the AAPM, is inviting us to use the existing structure of the AAPM to help an > > independent professionoal association get off the ground. We need a strong > > showing of individuals willing to take on the tasks needed to build an > > organization. Mark your calendars and begin your preparations to attend the > > first organizational meeting in Chicago next July 22-23. > > Please distribute this to your non-listersever colleagues. > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water flow through Varian bend magnet coils Message-ID: <3860D2BF.DD8EE348@wfubmc.edu> From: tcullen@wfubmc.edu To: MLancaster@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: water flow through Varian bend magnet coils Date: Wed, 22 Dec 1999 05:31:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, this may sound contradictory, but it appears the manufacturer is more concerned with temperature versus water flow on the bmag. Of course you have to have a good flow to keep the thermo-switches from activating, but what I'm getting at if you did not have adequate flow through the bmag, it would be the thermo-switches that would nail you. Correct me if I'm wrong. Happy Holidays MLancaster@aol.com wrote: > Have any of you ever measured the flow rate for the water through Varian bend > magnet coils? We checked it on a Clinac 1800 today and it appears to be only > about 0.25 gpm per coil (1gpm total). This doesn't seem like it would be > enough flow but it also seems unlikely that all four coils would be > restricted (especially an equal amount). The hoses are new and the 1/2" hose > supplying the bend magnet supply manifold has much more than 1 gpm if it is > checked by itself. > > And yes, the machine is not closing the flow switch for the loop which > includes the magnet. > > Thanks in advance... > > Mike Lancaster > OMS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water flow through Varian bend magnet coils Message-ID: <006e01bf4c4d$21d28220$0100005a@pacbell.net> From: Domenic Greco To: MLancaster@aol.com, linac-eng@plato1.aristotle.net Subject: Re: water flow through Varian bend magnet coils Date: Tue, 21 Dec 1999 23:21:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, If memory serves me right, the spec for total flow on the coil is 0.8gpm minimum for a -07 bend magnet. Not sure if the coil in a -10 bend magnet (CL2100/CL2300) is different. Regards, Domenic Greco Radiation Electronics, Inc. dgreco@pacbell.net ----- Original Message ----- From: To: Sent: Tuesday, December 21, 1999 9:09 PM Subject: water flow through Varian bend magnet coils > Have any of you ever measured the flow rate for the water through Varian bend > magnet coils? We checked it on a Clinac 1800 today and it appears to be only > about 0.25 gpm per coil (1gpm total). This doesn't seem like it would be > enough flow but it also seems unlikely that all four coils would be > restricted (especially an equal amount). The hoses are new and the 1/2" hose > supplying the bend magnet supply manifold has much more than 1 gpm if it is > checked by itself. > > And yes, the machine is not closing the flow switch for the loop which > includes the magnet. > > Thanks in advance... > > Mike Lancaster > OMS > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: water flow through Varian bend magnet coils Message-ID: <0.4fc495bf.2591b6f2@aol.com> From: MLancaster@aol.com To: linac-eng@plato1.aristotle.net Subject: water flow through Varian bend magnet coils Date: Tue, 21 Dec 1999 21:09:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Have any of you ever measured the flow rate for the water through Varian bend magnet coils? We checked it on a Clinac 1800 today and it appears to be only about 0.25 gpm per coil (1gpm total). This doesn't seem like it would be enough flow but it also seems unlikely that all four coils would be restricted (especially an equal amount). The hoses are new and the 1/2" hose supplying the bend magnet supply manifold has much more than 1 gpm if it is checked by itself. And yes, the machine is not closing the flow switch for the loop which includes the magnet. Thanks in advance... Mike Lancaster OMS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Base Frame Message-ID: <6CE096D0CDF4D211A3110008C75D07523603D2@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: Base Frame Date: Tue, 21 Dec 1999 14:01:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, The Siemens MD-2 base frame that we had for sale has been sold. To all who expressed interest, thank you. May all of you have a safe and happy holiday season. Hopefully none of us will spend Christmas eve in a treatment room wondering why we took this job in the first place. Dan Watters Rad. Eng. UMC Tucson, AZ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: professional society Message-ID: <385FF37A.9E95274E@wfubmc.edu> From: tcullen@wfubmc.edu To: twaldron@mail.mdanderson.org Cc: linac-eng@plato1.aristotle.net, khogstro@mdanderson.org Subject: Re: professional society Date: Tue, 21 Dec 1999 13:39:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tim, thanks for your persistence in this matter and congratulations to members of the list server group in showing an undying interest in the formation of such a society. Nothing but good will come of it. I look forward to putting faces with names in July. Dr. Hogstrom, thank you for your assistance and time. This is very good news for the new millennium. Happy Holidays to All twaldron@mail.mdanderson.org wrote: > Dear colleagues and fellow linac-fixers: > > The notion of a professional society for linac-fixing types is a topic that has > come up time and again in this forum. The following is an invitiation from the > AAPM to act as a facilitator to us in this endeavor. Dr. Hogstrom, as president > of the AAPM, is inviting us to use the existing structure of the AAPM to help an > independent professionoal association get off the ground. We need a strong > showing of individuals willing to take on the tasks needed to build an > organization. Mark your calendars and begin your preparations to attend the > first organizational meeting in Chicago next July 22-23. > Please distribute this to your non-listersever colleagues. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Y2k and all that. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Y2k and all that. Date: Tue, 21 Dec 1999 10:06:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day. I promised (a while ago) to post our y2k issues to the list early on Jan1 NZ time thus giving early warning for sites further west BUT....... I received notification yesterday that our hospital is pulling it's I-net plug over the y2k changeover period. Therefore I will not be able to post. Happy CHRISTmas and an uneventful N.Year. Dave. PS my wife is convinced there is going to be MAJOR computer chaos on the changeover of Y2k.. There has to be... There are going to be thousands of computers being checked by VERY HUNGOVER people with 'ADMIN' priviledges. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Gammex lasers Message-ID: <199912211457.OAA13133@mkoc.demon.co.uk> From: dfenn@mkoc.inet.mkoc.mkh-tr.sthames.nhs.uk To: cconn@kih.net Cc: linac-eng@plato1.aristotle.net Subject: Re: Gammex lasers Date: Tue, 21 Dec 1999 06:57:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Hello all; > I have some of the older He-Ne lasers in use. Is anyone out there repairing > these or are you just replacing them with the newer diode lasers. > If you are repairing them where do you get parts and do you have a schematic > for them. > I have one that takes a long time to come on. (sometimes) Does anyone > already know what the problem is, before I begin to troubleshoot. > > Calvin R. Conn > cconn@kih.net Hi Calvin, The Gammex supplied He-Ne tubes we use here were are from Melles Griot and are green. I have found that sometimes the PSU driving the tube will not start. This is proved quickly by substitution with another channel. If the tube is faulty there is no repair possible as they are sealed units. Melles Griot have a "barn door" spec for the output of these tubes which means to us that even new ones coming in are too dim! We have recently changed to Uniphase tubes which seem very good on output (much tighter spec) and are cheaper too! However, I would opt for green diodes for new rooms - check out the LAP version with remote controlled alignment - it's very good. Best wishes David Fenn Mid Kent Oncology Centre MAIDSTONE Kent UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DMS1 Data Message-ID: <000701bf4bb3$5e77c540$ebc6d6d8@pavilion> From: Richard Kimball To: Chris.C.Coley@erhc-tr.nthames.nhs.uk, linac-eng@plato1.aristotle.net Subject: Re: DMS1 Data Date: Tue, 21 Dec 1999 05:00:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, It's been a long time since I heard anyone talk about the data stream for a conventional Mevatron... >From my memory, Siemens uses a 31 bit word. To view the data, I believe you need your protocol set to 7bit Even parity and 2 stop bits. Any terminal program can view this, although some of the software I've used from Siemens formats the data nicely. Manuals included with your machine have excellent info about all of this. I don't have access to this info any more so I am just guessing here. Anyone? Cheers, Rich Kimball ----- Original Message ----- From: To: Sent: Tuesday, December 21, 1999 5:13 AM Subject: DMS1 Data > Help ! > > We are trying to connect our Siemens Mevatron (Conventional) to the Helax > Visir verification system. The problem is the Helax Visir does not recognise > the DMS1 data. If we attach a current loop converter to a PC and look at the > data, we get a string of letters instead of numbers. > ie ___PPPRQYPPPRPPPPQYQQYQSQQQS___PPPRQYPPPRPPPPQYQQYQSQQQS___ > Using the CDR program from Siemens, again we get letters. > > Normally I would have said okay we have a fault, but the protractor and our > existing punch card verification system receive the same data. They work > fine. > > Has anyone got any ideas as to wheather we have a fault or a strange protocol > ???? > > Chris ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DMS1 Data Message-ID: <"WIN1ee8-991221101359-0EE0*/G=Chris/I=C/S=Coley/O=NHS ESSEX RIVERS HEALTHCARE TR/PRMD=NHS NTHAMES HN/ADMD=NHS/C=GB/"@MHS> From: Chris.C.Coley@erhc-tr.nthames.nhs.uk To: linac-eng@plato1.aristotle.net Subject: DMS1 Data Date: Tue, 21 Dec 1999 03:13:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Help ! We are trying to connect our Siemens Mevatron (Conventional) to the Helax Visir verification system. The problem is the Helax Visir does not recognise the DMS1 data. If we attach a current loop converter to a PC and look at the data, we get a string of letters instead of numbers. ie ___PPPRQYPPPRPPPPQYQQYQSQQQS___PPPRQYPPPRPPPPQYQQYQSQQQS___ Using the CDR program from Siemens, again we get letters. Normally I would have said okay we have a fault, but the protractor and our existing punch card verification system receive the same data. They work fine. Has anyone got any ideas as to wheather we have a fault or a strange protocol ???? Chris ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: professional society Message-ID: <8625684E.00011B5E.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Cc: khogstro@mdanderson.org Subject: professional society Date: Mon, 20 Dec 1999 15:59:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear colleagues and fellow linac-fixers: The notion of a professional society for linac-fixing types is a topic that has come up time and again in this forum. The following is an invitiation from the AAPM to act as a facilitator to us in this endeavor. Dr. Hogstrom, as president of the AAPM, is inviting us to use the existing structure of the AAPM to help an independent professionoal association get off the ground. We need a strong showing of individuals willing to take on the tasks needed to build an organization. Mark your calendars and begin your preparations to attend the first organizational meeting in Chicago next July 22-23. Please distribute this to your non-listersever colleagues. **************************************************************************** ******************************************************************* Press Release for AAPM Newsletter AAPM Forms Ad-hoc Committee to Assist in Formation of Professional Society for Radiotherapy Accelerator Maintenance Personnel by Kenneth R. Hogstrom AAPM President During the annual meeting of the Radiological Society of North America in Chicago, the Executive Committee of the American Association of Physicists in Medicine (AAPM) consented to my forming, effective January 1, 2000, an ad-hoc committee entitled "Formation of Professional Society for Radiotherapy Accelerator Maintenance Personnel." The objectives of the ad-hoc committee will be (1) to provide radiotherapy accelerator maintenance personnel an opportunity to form a professional society, (2) to facilitate the process so long as they wish to proceed, and (3) to ensure that the AAPM and medical physicists maintain a strong professional relationship with radiotherapy accelerator maintenance personnel through any society formed. The formation of the ad-hoc committee follows two investigating committee meetings held on July 26 and October 31, 1999 between AAPM representatives and radiotherapy accelerator service providers from Elekta, Siemens, Varian, third parties, and local institutions. The ad-hoc committee is charged with (1) scheduling and hosting a forum for the purpose of initiating the planning process for establishment of a professional society for accelerator engineers and technicians, (2) providing leadership and logistical support throughout the process of forming this professional society, (3) helping establish mechanisms that promote a high degree of professionalism amongst its members and that ensure a continued high level of competition amongst companies providing accelerator maintenance service, (4) encouraging the professional society to maintain a strong relationship with medical physicists by incorporating features such as allowing the AAPM to be a member organization, utilizing administrative services of AAPM headquarters on a for-fee basis, conducting annual meetings in conjunction with the AAPM annual meeting, and allowing medical physicists to have associate or other class of membership, and (5) reporting progress regularly to the AAPM. Jim Galvin will chair the ad-hoc committee, and Larry Berkley will serve as vice chair. There will be representatives from Elekta, Siemens, Varian, third party service personnel, and institutional service personnel. Other AAPM members will include liaisons from key committees and at least 2 at-large AAPM members. I will be an ex-officio member, and there will be a representative from AAPM headquarters. The first major action of the ad-hoc committee will be its hosting the first organizational meeting of interested radiotherapy accelerator engineers and technicians. The logistics of the meeting will be coordinated by the AAPM Headquarters Office (Sal Trofi, Jr., Executive Director and Angela Keyser, Deputy Executive Director). The meeting will be held on Saturday and Sunday, July 22-23, 2000, just prior to the 2000 World Congress on Medical Physics and Biomedical Engineering and the AAPM Annual Meeting. The meeting will take place at the AAPM host hotel, the Sheraton Chicago. Hotel rooms should be reserved prior to the housing registration deadline, June 23. Advanced registration will cost $50, and registration after June 1 will cost $100. Details regarding registration and housing can be obtained from Farhana Khan in the AAPM office (phone: 301-209-3375 or email: farhana@aapm.org). For those interested in attending the World Congress following this meeting, registration is available on a daily and week ly basis, and information can be accessed through the internet at http://www.wc2000.org. The program of the July 22-23 meeting will be developed by the ad-hoc committee and is expected to consist of a series of lectures followed by discussion groups. Questions expected to be addressed are: (1) What is a professional society? (2) What are the benefits of a professional society? (3) How are professional societies structured and administered? (4) What are the fiscal costs of a professional society? (5) What mechanisms are there for funding a professional society? (6) What are the steps necessary to form a professional society? (7) How will the professional society be formed? (8) What will be the geographic scope of the society? (some have suggested to initially limit membership to the United States and Canada) (9) What is the potential role of the AAPM in the society? and (10) What are the next steps? In summary, the formation of an ad-hoc committee is a statement that the AAPM is committed to the successful formation of a professional society for radiotherapy accelerator engineers and technicians and will facilitate formation of the society. However, the society will consist of accelerator maintenance personnel and will be organized and maintained by accelerator maintenance personnel, not the AAPM. We look forward to participation of all engineers and technicians that want to be of part this founding effort. Medical physicists are encouraged to discuss these plans with their radiotherapy accelerator maintenance providers. December 15, 1999 **************************************************************************** ********************************************************************* ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mfil interlock Message-ID: <8625684D.005E78AF.00@LXH1CS70.GUNDLUTH.ORG> From: Al Engstler To: linac-eng@plato1.aristotle.net Subject: Mfil interlock Date: Mon, 20 Dec 1999 09:12:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Got called in early this morning to find our 600CD sn 491 sitting with a Mfil fault. Traced problem down to K9 on the power distribution board. The relay had a burn't up pin in one of the PC board sockets. To get them running I swapped the relay,cleaned up and resoldered the sockets. Is there somewhere I could order these PC board individual sockets? Thanks, and Happy Holidays to everyone. Alan Engstler aengstle@gundluth.org ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Chief Radiotherapy Engineer UCLH Message-ID: <000101bf4afe$ddc16190$75e82880@medphys.ucl.ac.uk> From: Ivan Rosenberg Reply-To: ivan To: 'Linac Eng List' Subject: Chief Radiotherapy Engineer UCLH Date: Mon, 20 Dec 1999 07:28:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This Ad will appear on the IPEM Bulletin for 12 January 2000 Chief Radiotherapy Engineer University College London Hospitals NHS Trust The Meyerstein Institute of Oncology Radiotherapy Physics Section Clinical Scientist B18-22 / Medical Technical Officer MTO5+3 : #29,189 - 33,764 We require a radiotherapy equipment engineer with a track record in successful maintenance of linear accelerators and other radiotherapy equipment. The person appointed will lead a team of technical officers, training them in servicing techniques and developing a team approach to maintaining the equipment in optimum condition. A key element in this will be the implementation of a systematic approach to equipment support, and developing the related Quality System documentation. The ability to work under pressure and to participate in early and late duties is essential. Close liaison with radiographers, radiotherapy physicists, clinicians and medical technical officers is required. The Radiotherapy Department has three Philips linear accelerators (one soon to be replaced), and two Varian units with MLC and PV. Additionally, there are two cobalt teletherapy machines, two superficial treatment X-ray sets, one simulator, a dedicated CT-simulator and a Microselectron HDR afterloading unit. The responsibility of this post-holder will be to provide a safe and efficient equipment support service to the Radiotherapy Department. You will be directly responsible for the supervision and training of three Radiotherapy Engineers. Engineering staff from the Equipment Management Group will also be involved in the rota to provide engineering support. This aspect of their work will be under your supervision. There will be close liaison with the Head of Radiation Physics, whose group comprises ten other scientists dedicated to Radiotherapy. Terms and conditions are in accordance with current Whitley Council agreements. The Department operates a no smoking policy. The post is suitable for job share arrangements. For further details please contact Dr. Ivan Rosenberg on 071-380 9437, e-mail: ivan@medphys.ucl.ac.uk or Mr Derek D'Souza on 0171-380-9438, e-mail: d.dsouza@medphys.ucl.ac.uk For an application form and job description, please contact the Personnel Department, University College Hospital, Versey Strong Building, 112 Hampstead Road, London NW1 2LT or telephone 071-380 9699 (24 hour answer phone) quoting reference No. CL/ 620 Closing Date: 31 January 2000 ------------------------------------------------- Ivan Rosenberg, Ph.D. Head of Radiotherapy Physics Department of Medical Physics and Bio-Engineering The University College Hospitals NHS Trust Middlesex Hospital Mortimer Street, London W1N 8AA. Tel: (+44) 0171 380-9437 direct (+44) 0171 636-833 bleep: 2259 FAX: (+44) 0171 380-9111 e-mail; ivan@medphys.ucl.ac.uk ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: (no subject) Message-ID: <0.bfbc5a87.258fa44e@aol.com> From: CherokeeCa@aol.com To: linac-eng@plato1.aristotle.net Subject: (no subject) Date: Mon, 20 Dec 1999 07:25:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are interested in purchasing a 1800-2100 linear accelerator. If you have any ideas as to where to begin looking for this please let me know thank-you ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <01BF4AFB.C8AA1660@ppp-1-41.cvx4.telinco.net> From: John Macmillan To: 'Linac Eng List' Cc: "'medical-physics-engineering@mailbase.ac.uk'" Subject: Date: Mon, 20 Dec 1999 06:53:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Re: Our RT100 saga:- "It has finally deteriorated over the last few weeks and has now been withdrawn from service. After carrying out the 'easiest' options for repair (thanks list), Philips are adamant it is the filament breaking down in the tube. Good News: They may be able to recondition the tube in Hamburg. But I am still awaiting details and price." BAD NEWS: Philips cannot recon or provide a replacement - end of story. Has anyone got a spare tube? Regards John Macmillan Radiotherapy Physics Royal Shrewsbury Hospital UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Water Pumps Message-ID: <00BE56E17E26D11197CB00805FA6803A023BB525@mail.midcentral.co.nz> From: Keith Croft To: 'Linac eng' Subject: Water Pumps Date: Sun, 19 Dec 1999 13:09:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Having pulled the pumps out of a 2100C (#86) and 600C (#178) - yes they are stainless steal. The water seals to the motor eventually leaks, the motor fills up with water.. but continues to run O.K. Eventually the bearings loose their grease and the bearing is slowly destroyed. Indications are the motor is working harder by tripping the fuse for the pumps. Grunfos's local agents were happy to supply just the motor. But turn around time for the 110V 3 phase version is slow as nominal voltage here is 230V. Keith, New Zealand. -----Original Message----- From: Accelinear@aol.com [mailto:Accelinear@aol.com] Sent: Monday, December 20, 1999 3:16 AM To: RKimball@radonc-uc-po.mcis.uchicago.edu; Virago1100@aol.com; PilotDaveR@cs.com; Linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. No, I don't believe there is any PVC in the water pumps used in Varian linacs. I have very recently seen an exposed demo model from Grunfos. It looks to be nearly 100% stainless, as advertised. Remember, these are stainless steel waterpumps for use in food handling situations. There are a couple of small rubber seals but I'm sure they do not effect water quality. I suspect that Jim is correct in that the chlorides are coming from the DI cartridge. Yet, it is very doubtful that the level of chlorides being discussed would have any meaningful effect on the copper in the machine. Marty Shapiro PE, Technical Options of Georgia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Diode Lasers Message-ID: <00BE56E17E26D11197CB00805FA6803A023BB526@mail.midcentral.co.nz> From: Keith Croft To: 'Linac eng' Subject: Diode Lasers Date: Sun, 19 Dec 1999 13:10:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We too have seen the diodes slowly fade over time, or split into two lines. Scandatronix wanted to get them back to the factory for repair. Seemed rather silly to send them to the other side of the planet for that. We put Toshiba laser diodes into these units Type TOLD9211. Red light of 671.4nm. Haven't done this for a while now, so can't give specifics on life time. The replacement process is simple, after which you may need to refocus. Keith Palmerston North New Zealand. -----Original Message----- From: John Somers [mailto:somers@radonc17.ucsf.edu] Sent: Saturday, December 18, 1999 9:14 PM To: Jerry Maddox; 'linac-eng@plato.aristotle.net' Subject: Re: Lasers At 04:40 PM 12/17/99 -0800, Jerry Maddox wrote: >Getting a lot out of the laser discussion. TX > >We used to fix homemade hard tube types, similar problems to those >discussed. > >We have a lot of Scanditronix solid state lasers which are very stable in >position. They are also reliable, with a few failure where the line gets >larger or turns into two. >We were told that we could repair these ourselves, but this did not turn >out to be the case for various reasons. Repairs are expensive, apparently >since they have to go back to the factory. > Jerry, this is not good news regarding the repairability of Scanditronix' diode lasers. Could you tell us more about the reasons they are not repairable in house? Also, what lifetimes are you getting from these lasers? And what is the typical cost and turn-around time if one is sent to the factory for repair? Thanks, John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Diode Lasers Message-ID: <00BE56E17E26D11197CB00805FA6803A023BB526@mail.midcentral.co.nz> From: Keith Croft To: 'Linac eng' Subject: Diode Lasers Date: Sun, 19 Dec 1999 13:10:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We too have seen the diodes slowly fade over time, or split into two lines. Scandatronix wanted to get them back to the factory for repair. Seemed rather silly to send them to the other side of the planet for that. We put Toshiba laser diodes into these units Type TOLD9211. Red light of 671.4nm. Haven't done this for a while now, so can't give specifics on life time. The replacement process is simple, after which you may need to refocus. Keith Palmerston North New Zealand. -----Original Message----- From: John Somers [mailto:somers@radonc17.ucsf.edu] Sent: Saturday, December 18, 1999 9:14 PM To: Jerry Maddox; 'linac-eng@plato.aristotle.net' Subject: Re: Lasers At 04:40 PM 12/17/99 -0800, Jerry Maddox wrote: >Getting a lot out of the laser discussion. TX > >We used to fix homemade hard tube types, similar problems to those >discussed. > >We have a lot of Scanditronix solid state lasers which are very stable in >position. They are also reliable, with a few failure where the line gets >larger or turns into two. >We were told that we could repair these ourselves, but this did not turn >out to be the case for various reasons. Repairs are expensive, apparently >since they have to go back to the factory. > Jerry, this is not good news regarding the repairability of Scanditronix' diode lasers. Could you tell us more about the reasons they are not repairable in house? Also, what lifetimes are you getting from these lasers? And what is the typical cost and turn-around time if one is sent to the factory for repair? Thanks, John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: <0.bed994a9.258e42af@aol.com> From: Accelinear@aol.com To: RKimball@radonc-uc-po.mcis.uchicago.edu, Virago1100@aol.com, PilotDaveR@cs.com, Linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Sun, 19 Dec 1999 06:16:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" No, I don't believe there is any PVC in the water pumps used in Varian linacs. I have very recently seen an exposed demo model from Grunfos. It looks to be nearly 100% stainless, as advertised. Remember, these are stainless steel waterpumps for use in food handling situations. There are a couple of small rubber seals but I'm sure they do not effect water quality. I suspect that Jim is correct in that the chlorides are coming from the DI cartridge. Yet, it is very doubtful that the level of chlorides being discussed would have any meaningful effect on the copper in the machine. Marty Shapiro PE, Technical Options of Georgia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: <0.bed994a9.258e42af@aol.com> From: Accelinear@aol.com To: RKimball@radonc-uc-po.mcis.uchicago.edu, Virago1100@aol.com, PilotDaveR@cs.com, Linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Sun, 19 Dec 1999 06:16:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" No, I don't believe there is any PVC in the water pumps used in Varian linacs. I have very recently seen an exposed demo model from Grunfos. It looks to be nearly 100% stainless, as advertised. Remember, these are stainless steel waterpumps for use in food handling situations. There are a couple of small rubber seals but I'm sure they do not effect water quality. I suspect that Jim is correct in that the chlorides are coming from the DI cartridge. Yet, it is very doubtful that the level of chlorides being discussed would have any meaningful effect on the copper in the machine. Marty Shapiro PE, Technical Options of Georgia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: TBI setup Message-ID: <8625684B.00018010.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Subject: TBI setup Date: Fri, 17 Dec 1999 16:03:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes indeed. On a Varian Hi-Energy C Series machine, the TBI and HDTSe modes require software and an additional program PCB to run at the higher dose rates used. It's a purchased option. Tim W ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: TBI setup Message-ID: <8625684B.00018010.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Subject: TBI setup Date: Fri, 17 Dec 1999 16:03:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes indeed. On a Varian Hi-Energy C Series machine, the TBI and HDTSe modes require software and an additional program PCB to run at the higher dose rates used. It's a purchased option. Tim W ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Lasers Message-ID: <4.1.19991218031029.009361b0@radonc17.ucsf.edu> From: John Somers To: Jerry Maddox , "'linac-eng@plato.aristotle.net'" Subject: Re: Lasers Date: Sat, 18 Dec 1999 00:14:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 04:40 PM 12/17/99 -0800, Jerry Maddox wrote: >Getting a lot out of the laser discussion. TX > >We used to fix homemade hard tube types, similar problems to those >discussed. > >We have a lot of Scanditronix solid state lasers which are very stable in >position. They are also reliable, with a few failure where the line gets >larger or turns into two. >We were told that we could repair these ourselves, but this did not turn >out to be the case for various reasons. Repairs are expensive, apparently >since they have to go back to the factory. > Jerry, this is not good news regarding the repairability of Scanditronix' diode lasers. Could you tell us more about the reasons they are not repairable in house? Also, what lifetimes are you getting from these lasers? And what is the typical cost and turn-around time if one is sent to the factory for repair? Thanks, John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Lasers Message-ID: <4.1.19991218031029.009361b0@radonc17.ucsf.edu> From: John Somers To: Jerry Maddox , "'linac-eng@plato.aristotle.net'" Subject: Re: Lasers Date: Sat, 18 Dec 1999 00:14:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 04:40 PM 12/17/99 -0800, Jerry Maddox wrote: >Getting a lot out of the laser discussion. TX > >We used to fix homemade hard tube types, similar problems to those >discussed. > >We have a lot of Scanditronix solid state lasers which are very stable in >position. They are also reliable, with a few failure where the line gets >larger or turns into two. >We were told that we could repair these ourselves, but this did not turn >out to be the case for various reasons. Repairs are expensive, apparently >since they have to go back to the factory. > Jerry, this is not good news regarding the repairability of Scanditronix' diode lasers. Could you tell us more about the reasons they are not repairable in house? Also, what lifetimes are you getting from these lasers? And what is the typical cost and turn-around time if one is sent to the factory for repair? Thanks, John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: <0.bdc7f321.258c1c4a@aol.com> From: Virago1100@aol.com To: Linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Fri, 17 Dec 1999 15:07:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, Yes, I believe that you are correct in that some pumps have plastic impellers. But I wouldn't think that they would be a significant source of chlorides. Jim McKenzie ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: TBI SETUP Message-ID: From: Robert Wood To: Linac-eng@plato1.aristotle.net Subject: TBI SETUP Date: Fri, 17 Dec 1999 14:53:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The problem I am having is that on the other unit I can't even get into Special Procedures mode. It says "This Major Mode is currently not available" when I select Special Procedures. I am sure I have to add something to the hardware but I don't know what so i will contact Varian. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Water Leaks in B-mag area.. Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D83F@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'Virago1100@aol.com'" , PilotDaveR@cs.com, Linac-eng@plato1.aristotle.net Subject: RE: Water Leaks in B-mag area.. Date: Fri, 17 Dec 1999 11:44:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I could be totally off base here, but aren't the impellers in most of the water pumps used made of PVC? Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel-773.702.6879 > -----Original Message----- > From: Virago1100@aol.com [SMTP:Virago1100@aol.com] > Sent: Friday, December 17, 1999 11:18 AM > To: PilotDaveR@cs.com; Linac-eng@plato1.aristotle.net > Subject: Re: Water Leaks in B-mag area.. > > Dave, > > The Varian machines do not have any PVC in the closed system that I am > aware > of. The chlorides, as it was explained to me, are coming from the > exhausted > deionizer cartridge. From what I have seen over the years, the disposable > cartridges very seldom were changed as frequently as they should have > been. > When the cartridge is exhausted it begins to dump chlorides back into the > system. The Varian machines never had an indicator with the old disposable > > cartridges and the cartridges were typically changed anywhere from every 6 > to > 12 months, which in my opinion is not frequent enough to prevent them from > > becoming exhausted. The Siemens machines have always used an indicator > with > the disposable cartridge which allowed them to be changed before they > became > exhausted and started dumping chlorides into the water system. > Jim McKenzie > Acceletronics Mid-Atlantic ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: <0.ea2ee64.258bca44@aol.com> From: Virago1100@aol.com To: PilotDaveR@cs.com, Linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Fri, 17 Dec 1999 09:17:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, The Varian machines do not have any PVC in the closed system that I am aware of. The chlorides, as it was explained to me, are coming from the exhausted deionizer cartridge. From what I have seen over the years, the disposable cartridges very seldom were changed as frequently as they should have been. When the cartridge is exhausted it begins to dump chlorides back into the system. The Varian machines never had an indicator with the old disposable cartridges and the cartridges were typically changed anywhere from every 6 to 12 months, which in my opinion is not frequent enough to prevent them from becoming exhausted. The Siemens machines have always used an indicator with the disposable cartridge which allowed them to be changed before they became exhausted and started dumping chlorides into the water system. Jim McKenzie Acceletronics Mid-Atlantic ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: TBI setup Message-ID: <385A4E42.A371DEC0@wfubmc.edu> From: tcullen@wfubmc.edu To: Robert Wood Cc: linac-eng@plato1.aristotle.net Subject: Re: TBI setup Date: Fri, 17 Dec 1999 06:52:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Woody, I'm curious. If you are currently doing TBI treatments with a 2100C, then why would you want to know how to do it with another? It's mostly the responsibility of physics/dosimetry. So staffing at the facility would be a concern. If you mean what other peripheral equipment will you need. The answer is not much, unless you will be doing standup TBI treatments which will require you building a stand or purchasing one. You need to make sure the other facility has a TBIx or e accessory for whatever accessory mount system you have. Like the gentleman from the mideast asked last week, the distance is important if the unit is in a small vault. Also it would not hurt to check the machine performance with long "heat runs" prior to actually doing the treatments. This unit will have to have a higher reliability standard and if it has a past history of being a "problem" unit, then this would have to be resolved. Hope this helps and Happy Holidays. Robert Wood wrote: > We currently have a (Varian) 2100C, that we use for TBI. > We have a 2100C that is 40 miles away that we want to set up for TBI, what all will it entail. > Thanks > Woody ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: TBI setup Message-ID: From: "Lapenna, Russ" To: 'Robert Wood' , linac-eng@plato1.aristotle.net Subject: RE: TBI setup Date: Fri, 17 Dec 1999 03:36:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > > We currently have a (Varian) 2100C, that we use for TBI. > We have a 2100C that is 40 miles away that we want to set up > for TBI, what all will it entail. > Thanks > Woody > I think a 40 mile machine to patient distance might be a bit too large for successful TBI. Sorry couldn't resist. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Water Quality Message-ID: <004801bf484c$793cb800$969aacd1@pen300> From: Dave D To: Linac-Eng Subject: Water Quality Date: Thu, 16 Dec 1999 21:06:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Following the manufacturers recommendations seems to be the best course of action. DaveD ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Gammex lasers Message-ID: <0.b156df8d.258b0051@aol.com> From: Accelinear@aol.com To: acceltek@flash.net, oxiknox@mindspring.com, linac-eng@plato1.aristotle.net Subject: Re: Gammex lasers Date: Thu, 16 Dec 1999 18:56:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Technical Options stocks both new laser tubes AND the new style (block) power supply at very reasonable pricing. 1-800-755-9640. Oh, and no part number is usually required. Just tell us what you need. We'll help you find the right number. Marty Shapiro, Technical Options of GA. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: <0.aa85f8b3.258aca55@cs.com> From: PilotDaveR@cs.com To: Virago1100@aol.com, Linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Thu, 16 Dec 1999 15:05:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, you are right on track. I hired a metallurgist to analyze one of our failed slits. They came to the same conclusions. We also had a square external perforation. X-ray examination also proved off-center drilling of the slit. The Metallurgy Company advised that in my case, the primary failure was due to aggressive water. They did find a large amount of chlorides on the external surface yet, when testing the water and internal slit they could not find anything significant. Their secondary conclusion was the "off-center" drilling in the slits. Third conclusion was due to heat. Electron microscope magnification showed copper crystals which appear to have grown. So given the three parts, what can we control in the field? I am amazed to see your finding of the copper chlorides in the P154. I myself would have thought different. Where is the chlorides coming from? Does the Varian machine have PVC in the closed loop? Thanks for the info. David Rodriguez PilotDaveR@cs.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: TBI setup Message-ID: From: Robert Wood To: linac-eng@plato1.aristotle.net Subject: TBI setup Date: Thu, 16 Dec 1999 14:38:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We currently have a (Varian) 2100C, that we use for TBI. We have a 2100C that is 40 miles away that we want to set up for TBI, what all will it entail. Thanks Woody ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: <199912162051.OAA14610@bunyip.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: Virago1100@aol.com, linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Thu, 16 Dec 1999 12:50:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" From: Virago1100@aol.com Date sent: Thu, 16 Dec 1999 14:46:00 EST Subject: Re: Water Leaks in B-mag area.. To: linac-eng@plato1.aristotle.net > Hi All, > I am by no means a water expert but have been following the water discussion > with great interest since this has been an on going debate within our > company. Everyone has made valid points on both the pro and con of the D25P > cartridge (Culligan style) versus the disposable P154 cartridge, which goes > to show how confusing the issue has been! > ----------- Snip ---------------------- Nice data Jim. I suspect your right, that the extensive use of polyflow in a Siemens unit decreases the 'pinhole' syndrome. I've only seen it a couple times on a Siemens unit. Once on a Mev 12 that used the old copper thin-wall pipe as a distribution manifold. That one was very thin, after years of use, and the gentle torque of tightening a polyflow fitting broke loose the brazed connection. Another was a very small pinhole in the copper tubing brazed to the outside of a waveguide body of a Mev 12. It took almost a year to trace that leak. It was very small, and the waveguides on the 12's were enclosed in a strongback so the leak wasn't visible until the waveguide was removed from both the machine, and the strongback removed. The BM leaks were reportedly due to a junction used internally in the older BM's That junction is reportedly not used on the newer ones. Has anyone experienced leaks on the newer potted Siemens BM's (made by Elma I think)? Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Gammex lasers Message-ID: <199912162021.OAA21867@chupacabras.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: clyde , linac-eng@plato1.aristotle.net Subject: Re: Gammex lasers Date: Thu, 16 Dec 1999 12:19:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" From: "clyde" To: Subject: Re: Gammex lasers Date sent: Thu, 16 Dec 1999 14:49:02 -0500 > Gammex has new p/s that is very good, it's a solid box and is real easy to > replace, call 1-800-426-6391 ext-1238 and ask for Mike Nelson. > > Daryl Knox -------------------- Reply Seperator ----------------------- The last p/s we purchased from Gammex was over $500 Garian supplys are solid also and adjustable for voltage, come in 115 volt, or 115/220 dual, and are under $150. Maybe Gammex has moderated their pricing a bit. Also, we have not had a Garian p/s fail yet (aprox 3 year history). Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE:Gammex Lasers Message-ID: <99Dec16.141626est.116050@gateway.healthlink.on.ca> From: "Abbassian, Farhoud" To: "AE-LIST (E-mail)" Subject: RE:Gammex Lasers Date: Thu, 16 Dec 1999 11:09:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Calvin, The nominal life time of a Gammex HeNe laser tube is about 25000 hrs. Considering whether you keep them on at night or not, you can estimate when they should be replaced. As tube ages you might notice longer firing time - black lines/marks in the inner tube are also another indication of faulty tubes . As far as older type Power Supplies (non encapsulated ones) are concern, the most common problem are electrolytic capacitors (four of them) on the rectifier board - these capacitors operate at a voltage very close to what they're rated for and they go quite often. You can replace these with higher Working Voltage rated caps as long as you have a local supplier with a wide range of caps to select. Regards, Farhoud abbassian Princess Margaret Hospital Toronto, Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Picker VoxelQ Backup Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Picker VoxelQ Backup Date: Thu, 16 Dec 1999 10:03:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks: Does anyone out there have a VoxelQ system (used with Picker's AcQSim CT-Sim) with an optical disk drive. The reason I ask is for daily image backups. Presently they use 8mm tape to back up their images. This is time consuming due to the time it takes to rewind and ffwd the tapes. I would like to know if it would be faster to use an optical drive to back the images up. I have learned that the optical disks only hold 600MB. The tapes advertise that they hold 5GB (@112 meters). Also, the date transfer rate for read and write is signifigantly less for optical drives, but it does not need to ffwd and rewind. I would like to know if anyone has this and if they do, how well and fast does it operate. Regards, Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: leadite blocks Message-ID: <002301bf47e7$c2cd11a0$7e748cd4@default> From: "S. Murphy" Reply-To: "S. Murphy" To: linac digest Subject: leadite blocks Date: Thu, 16 Dec 1999 09:04:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, I would like to post a big "thanks" to all who have given advice and information regarding my posting about leadite blocks, especially Chris Forrest, John Somers and Richard Newby. I have learned more in two days than I could have managed alone in a year! Thanks again. Regards Sean Murphy Senior MTO RSH Hospital Southampton Tel. (+44) 02380 825393 Fax. (+44) 02380 825650 UK ___________________________________________________________ Disclaimer - The information and views expressed in this text are those of the author alone and should in no way be taken to express those of the Department or Trust management. ___________________________________________________________ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Gammex Lasers Message-ID: <000501bf47e6$bc4ee340$78c8d9ab@pwserver> From: Steve Schwarz To: linac-eng@plato1.aristotle.net Subject: Gammex Lasers Date: Thu, 16 Dec 1999 08:57:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Calvin, You can get the laser tubes from Melles Griot and the discrete components from Newark. we carry the parts in stock and perform depot repairs on the lasers as well. Send me an email with your address & numbers if you can't find the schematic tucked in the operators manual for the laser. We have a few of them around here. Be sure to specify the model number of the laser in your reply. Rgds to the list, Steve Schwarz, Acceletronics Subj: RE: Gammex lasers Date: 12/16/1999 10:39:10 AM Central Standard Time From: nelson@radonc.musc.edu (Nelson, Steve) Sender: owner-linac-eng@plato1.aristotle.net To: linac-eng@plato1.aristotle.net Calvin, I have also seen the resistors on the HVPS board change their values as the unit gets older. The resistors (nominally 27K for the older Gammex lasers) will decrease in value over time and will cause the tube to draw more current. If you change out the tube, check these resistors if present. regards, Stephen > -----Original Message----- > From: Gil Head [SMTP:gilf@dibbs.net] > Sent: Thursday, December 16, 1999 10:40 AM > To: cconn@kih.net > Cc: linac-eng@plato1.aristotle.net > Subject: Re: Gammex lasers > > > > Calvin Conn wrote: > > > > Hello all; > > I have some of the older He-Ne lasers in use. Is anyone out there > repairing > > these or are you just replacing them with the newer diode lasers. > > If you are repairing them where do you get parts and do you have a > schematic > > for them. > > I have one that takes a long time to come on. (sometimes) Does anyone > > already know what the problem is, before I begin to troubleshoot. > > > > Calvin R. Conn > > cconn@kih.net > > Probably just the tube age, next step flashing on and off, followed by > failure. If you look at the center of the tube you will probably see > some brown deposits. I don't know what causes this. > > If its the old surface mount power supply card it is usually just the > diodes. I had a home made spare parts kit w/all components but tossed > it in July. > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SOLUTION: communication error Clinac 2100C Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB50C@liosex1.lio.se> From: Viking Eilert To: "Linac-Eng (E-postl)" , Viking Eilert Cc: "Henning Christiansen (E-postl)" , "Tommie Jeppesen (E-postl)" , "Torben Larsen (E-postl)" , "Michael Severin (E-postl)" Subject: SOLUTION: communication error Clinac 2100C Date: Thu, 16 Dec 1999 08:39:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello again. I promised to come back with a possible solution of the problem below. = I am pretty sure we have solved the problem AT LAST. It seems to be the communication and control microprocessor printed circuit board (PCB) in = the STD bus (and the console +5 V power supply?). They BOTH have to have revision (rev.) number above 13 (17?). One of the first things we actually did was changing both PCB=B4s to a = rev. number above 13. (Maybe the replacement of the console +5 V power = supply or the flat cable, see below, was important as well). What we did WITHOUT any luck was replacing the control micropr. PCB to = rev. 18, replacing all PCB=B4s in the STD-bus one by one, run scandisk on = harddisk, replacing harddisk, reinstalling software program 5,4 on the console = PC, replacing console PC, reinstall the old IBM PS/2 PC with console = software version 5,4, changing serial cable from PC, installing UPS for 240 Vac = to PC, installing external extra fan for cooling of the STD-bus, = increasing the +5 V in console to approx 5,15 V, changing the serial communication PCB inside PC to BOCA IOAT55, disable network interface controller (NIC) = and power saving in BIOS on PC, replacing EPROM on communic. and control micropr. PCB again, reinstall NEW software version 5,4 with NEW = security module from Varian, checking jumpers on PCB=B4s in STD-bus, checking = DIP switches on DSYNC PCB in STD-bus, disconnecting cable to printer on parallell port, changing dedicated keyboard, checking all steps in the Varian service technical bulletin (STB) upgrade procedure to 5,4 and procedure for replacing PC. The last things we did that did SOLVE the problem (with help from = Varian) was replacing the +5 V power supply i console, replacing the flat cable = to communic. micropr. PCB in STD-bus, flushing the sockets in the STD-bus = hard with compressed air by removing all the PCB=B4s and at the same time = replacing the communic. micropr. PCB to rev. 20. (By reinstalling the old comm. micropr. PCB with rev. 7 the PROBLEM = came back). I hope these steps might help someone else. Tired but lucky Eilert Viking aaaaaaaaaaaaaaaaaaaaa Hello linac list. We have a Clinac 2100C #248. It was upgraded to version 5,4 and at the = same time Varian replaced the IBM PC to a pentium Dell optiplex. Ever since = we have had communication error which locks the Dell PC approximately once = a day (some times maybe five times a day and outer times maybe not for a couple of days). We havn't noticed any particular times when the error occour. Rather often it happens during the nights when the machine is = in standby. The only way to solve the problem is to reset the STD bus (or shutting = the machine off and on), then it works fine for a while. Our local Varian office doesn't know what causes the problem. First = they asked us to replace the communication and controller microprocessor PCB = to a vendor revision number 17 or above. We replaced them but it didn't = help. Could it be the Dell PC or the security module on the printer port of = the PC? We have know replaced all the PCB (beside the ADC, which we will = replace) in the STD bus without any luck. Have anyone of you out there on the list heard of a simular problem or = have any suggestions? Symptoms: 1. The LED on the control microprocessor PCB always shows 01 hex, = digital output read back failure. 2. The LED on the communication microprocessor PCB is ok (FF hex). 3. No info is stored in the Event log file. 4. If you reboot the Dell PC (when you have the comm error) it = sometimes shows on the screen: Installed versions 5,4,05 console software 1102194-10, comm software 01x*+0=A7/&=3D?...... (or some other rubbish characters), incorrect = comm firmware installed, incorrect controller firmware installed. or Communication failed reading firmware version - data 24 (or data 26) 5. No communication is possible from the machine to the Dell PC. We = have tried to look in service mode at the hex codes in = the common RAM, but I don't know if it have any relevant information = because of the lack of proper communication. The hex codes for = shows F1 or FD (should be 01 ?) and the shows F1 = or FF. Thank you Eilert Viking Universitetssjukhuset i Link=F6ping Eilert Viking O-centrum telefon: +46-13 222805 Radiofysikavdelningen fax: +46-13 222895 Sjukhusfysik Eilert.Viking@lio.se S-581 85 Link=F6ping Sweden telefon: +46-13 222000 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Gammex lasers Message-ID: From: "Nelson, Steve" To: linac-eng@plato1.aristotle.net Subject: RE: Gammex lasers Date: Thu, 16 Dec 1999 08:25:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Calvin, I have also seen the resistors on the HVPS board change their values as the unit gets older. The resistors (nominally 27K for the older Gammex lasers) will decrease in value over time and will cause the tube to draw more current. If you change out the tube, check these resistors if present. regards, Stephen > -----Original Message----- > From: Gil Head [SMTP:gilf@dibbs.net] > Sent: Thursday, December 16, 1999 10:40 AM > To: cconn@kih.net > Cc: linac-eng@plato1.aristotle.net > Subject: Re: Gammex lasers > > > > Calvin Conn wrote: > > > > Hello all; > > I have some of the older He-Ne lasers in use. Is anyone out there > repairing > > these or are you just replacing them with the newer diode lasers. > > If you are repairing them where do you get parts and do you have a > schematic > > for them. > > I have one that takes a long time to come on. (sometimes) Does anyone > > already know what the problem is, before I begin to troubleshoot. > > > > Calvin R. Conn > > cconn@kih.net > > Probably just the tube age, next step flashing on and off, followed by > failure. If you look at the center of the tube you will probably see > some brown deposits. I don't know what causes this. > > If its the old surface mount power supply card it is usually just the > diodes. I had a home made spare parts kit w/all components but tossed > it in July. > > Gil > "Suppose you were an idiot. And suppose you were a member of Congress. > But I repeat myself." Mark Twain ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re Water Leaks Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: Re Water Leaks Date: Thu, 16 Dec 1999 08:30:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have no experience of Varian accelerators, however Elekta SL series machines with a closed cooling system are dosed with Benzotriozole either on install or in the factory. This is a chemical which prevents copper corrosion and will therefore prevent corrosion should demineralised water be used instead of distilled water. Brian Whitlock Radiotherapy Physics Poole Hospital >>> TECHNICAL OPTIONS 12/16/99 02:12pm >>> Randy, You are correct about the Culligan demineralizers doing their job too well. We used to have them regenerated by Culligan locally, until they called us to ask why the water was green. We told them how they were being used and Culligan had the green water analyzed. As suspected, the water was filled with copper. Here's an exact Culligan quote: "Per our discussions and the information supplied from the water analysis we performed on equipment similar to that you service, we have confirmed that there is copper leaching occurring in your equipment. The copper in solution within your equipment is a hazardous material and cannot be discharged to the sanitary sewer. The copper from your equipment is being captured in the resin." We have heard several reports from customers who have had problems with fittings and even bend magnets as a result of this cartridge. Buyer, beware! Lisa Przepasniak Technical Options of Georgia ---------- From: Randy Niccolls Sent: Wednesday, December 15, 1999 10:46 AM To: PilotDaveR@cs.com; mdenning@emh.org; linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. We replaced a bend magnet about a year ago on our 2100C s/n:224 ....installed in 1991. The cause was a leak in the copper in the energy slit. We were told that the epoxy is not recommended....but on our 2100C s/n:305 ....also 1991 vintage has not developed that problem yet. If it starts leaking I will consider using the epoxy. We have noticed that when we have our culligan cartridges cleaned we have had a lot of copper in them. We have suspected the cartridges are doing to good of a job and causing the leaks. The copper in the energy slit I have been told is a lot more thin than the rest of the water system. Just a thought. We have thought about going back to the original deminerizer cartridges. Has anyone else experianced copper in Their culligan cartridges? These opinions are my own and not anyone elses. Randy Niccolls....... Linac Electronics Tech. Mountain States Tumor Institute Boise, Idaho >>> 12/15/99 12:25AM >>> I have experienced ea. 2100C machines fail in this mode. It was discovered that small perforations formed in the energy slit. They were C2 series machines manufactured in 1991. I'm told that epoxy applied externally might help. Twice this was tried by the OEM and it failed days later. Ouch... We had to purchase new B-mags. I have heard that epoxy can be applied internally by disconnecting the water lines to the Energy Slits and pumping epoxy back and forth to coat the slit walls. It takes approximately 24 hours to cure. I don't have personal experience with this method, but I can tell you anything you want to know about this type of failure, costs, down time, personal failure analysis, etc., etc. All I can say is Good Luck and God Speed... Further Questions? Please respond to PilotDaveR@cs.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Gammex lasers Message-ID: <199912161619.KAA21732@bunyip.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: Calvin Conn , linac-eng@plato1.aristotle.net Subject: Re: Gammex lasers Date: Thu, 16 Dec 1999 08:17:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Send reply to: From: "Calvin Conn" To: Subject: Gammex lasers Date sent: Thu, 16 Dec 1999 08:55:39 -0500 > Hello all; > I have some of the older He-Ne lasers in use. Is anyone out there repairing > these or are you just replacing them with the newer diode lasers. > If you are repairing them where do you get parts and do you have a schematic > for them. > I have one that takes a long time to come on. (sometimes) Does anyone > already know what the problem is, before I begin to troubleshoot. > > Calvin R. Conn > cconn@kih.net > > ----------------------- Reply Seperator ---------------------------- Calvin, We repair Gammex lasers here. We buy new tubes (red), from Technical Options, and new powersupplys from Garian. Total parts cost if both are replaced is about $450 which is usually quite a bit less than a new laser box, although with the decreasing cost of the laser units and the increased reliability, a switch to solid state is looking more attractive. The usual cause of a slow firing HeNe laser is a soft laser tube. Also, check the solder connections on the voltage multiplyer PCB if you have the old type powersupply (verses the potted type). The solder lands can get toasted due to heat from the resistors. Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Water Leaks in B-mag area.. Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: RE: Water Leaks in B-mag area.. Date: Thu, 16 Dec 1999 07:36:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have no experience of Varian accelerators, however Elekta SL series machines with a closed cooling system are dosed with Benzotriozole either on install or in the factory. This is a chemical which prevents copper corrosion and will therefore prevent corrosion should demineralised water be used instead of distilled water. Brian Whitlock Radiotherapy Physics Poole Hospital >>> TECHNICAL OPTIONS 12/16/99 02:12pm >>> Randy, You are correct about the Culligan demineralizers doing their job too well. We used to have them regenerated by Culligan locally, until they called us to ask why the water was green. We told them how they were being used and Culligan had the green water analyzed. As suspected, the water was filled with copper. Here's an exact Culligan quote: "Per our discussions and the information supplied from the water analysis we performed on equipment similar to that you service, we have confirmed that there is copper leaching occurring in your equipment. The copper in solution within your equipment is a hazardous material and cannot be discharged to the sanitary sewer. The copper from your equipment is being captured in the resin." We have heard several reports from customers who have had problems with fittings and even bend magnets as a result of this cartridge. Buyer, beware! Lisa Przepasniak Technical Options of Georgia ---------- From: Randy Niccolls Sent: Wednesday, December 15, 1999 10:46 AM To: PilotDaveR@cs.com; mdenning@emh.org; linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. We replaced a bend magnet about a year ago on our 2100C s/n:224 ....installed in 1991. The cause was a leak in the copper in the energy slit. We were told that the epoxy is not recommended....but on our 2100C s/n:305 ....also 1991 vintage has not developed that problem yet. If it starts leaking I will consider using the epoxy. We have noticed that when we have our culligan cartridges cleaned we have had a lot of copper in them. We have suspected the cartridges are doing to good of a job and causing the leaks. The copper in the energy slit I have been told is a lot more thin than the rest of the water system. Just a thought. We have thought about going back to the original deminerizer cartridges. Has anyone else experianced copper in Their culligan cartridges? These opinions are my own and not anyone elses. Randy Niccolls....... Linac Electronics Tech. Mountain States Tumor Institute Boise, Idaho >>> 12/15/99 12:25AM >>> I have experienced ea. 2100C machines fail in this mode. It was discovered that small perforations formed in the energy slit. They were C2 series machines manufactured in 1991. I'm told that epoxy applied externally might help. Twice this was tried by the OEM and it failed days later. Ouch... We had to purchase new B-mags. I have heard that epoxy can be applied internally by disconnecting the water lines to the Energy Slits and pumping epoxy back and forth to coat the slit walls. It takes approximately 24 hours to cure. I don't have personal experience with this method, but I can tell you anything you want to know about this type of failure, costs, down time, personal failure analysis, etc., etc. All I can say is Good Luck and God Speed... Further Questions? Please respond to PilotDaveR@cs.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Gammex lasers Message-ID: <385907CF.BC71A4C3@dibbs.net> From: Gil Head To: cconn@kih.net Cc: linac-eng@plato1.aristotle.net Subject: Re: Gammex lasers Date: Thu, 16 Dec 1999 07:39:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Calvin Conn wrote: > > Hello all; > I have some of the older He-Ne lasers in use. Is anyone out there repairing > these or are you just replacing them with the newer diode lasers. > If you are repairing them where do you get parts and do you have a schematic > for them. > I have one that takes a long time to come on. (sometimes) Does anyone > already know what the problem is, before I begin to troubleshoot. > > Calvin R. Conn > cconn@kih.net Probably just the tube age, next step flashing on and off, followed by failure. If you look at the center of the tube you will probably see some brown deposits. I don't know what causes this. If its the old surface mount power supply card it is usually just the diodes. I had a home made spare parts kit w/all components but tossed it in July. Gil "Suppose you were an idiot. And suppose you were a member of Congress. But I repeat myself." Mark Twain ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Water Leaks in B-mag area.. Message-ID: <01BF47A5.A3B53140@user-38lc43b.dialup.mindspring.com> From: TECHNICAL OPTIONS To: PilotDaveR@cs.com, mdenning@emh.org, linac-eng@plato1.aristotle.net, 'Randy Niccolls' Subject: RE: Water Leaks in B-mag area.. Date: Thu, 16 Dec 1999 06:12:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy, You are correct about the Culligan demineralizers doing their job too well. We used to have them regenerated by Culligan locally, until they called us to ask why the water was green. We told them how they were being used and Culligan had the green water analyzed. As suspected, the water was filled with copper. Here's an exact Culligan quote: "Per our discussions and the information supplied from the water analysis we performed on equipment similar to that you service, we have confirmed that there is copper leaching occurring in your equipment. The copper in solution within your equipment is a hazardous material and cannot be discharged to the sanitary sewer. The copper from your equipment is being captured in the resin." We have heard several reports from customers who have had problems with fittings and even bend magnets as a result of this cartridge. Buyer, beware! Lisa Przepasniak Technical Options of Georgia ---------- From: Randy Niccolls Sent: Wednesday, December 15, 1999 10:46 AM To: PilotDaveR@cs.com; mdenning@emh.org; linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. We replaced a bend magnet about a year ago on our 2100C s/n:224 ....installed in 1991. The cause was a leak in the copper in the energy slit. We were told that the epoxy is not recommended....but on our 2100C s/n:305 ....also 1991 vintage has not developed that problem yet. If it starts leaking I will consider using the epoxy. We have noticed that when we have our culligan cartridges cleaned we have had a lot of copper in them. We have suspected the cartridges are doing to good of a job and causing the leaks. The copper in the energy slit I have been told is a lot more thin than the rest of the water system. Just a thought. We have thought about going back to the original deminerizer cartridges. Has anyone else experianced copper in Their culligan cartridges? These opinions are my own and not anyone elses. Randy Niccolls....... Linac Electronics Tech. Mountain States Tumor Institute Boise, Idaho >>> 12/15/99 12:25AM >>> I have experienced ea. 2100C machines fail in this mode. It was discovered that small perforations formed in the energy slit. They were C2 series machines manufactured in 1991. I'm told that epoxy applied externally might help. Twice this was tried by the OEM and it failed days later. Ouch... We had to purchase new B-mags. I have heard that epoxy can be applied internally by disconnecting the water lines to the Energy Slits and pumping epoxy back and forth to coat the slit walls. It takes approximately 24 hours to cure. I don't have personal experience with this method, but I can tell you anything you want to know about this type of failure, costs, down time, personal failure analysis, etc., etc. All I can say is Good Luck and God Speed... Further Questions? Please respond to PilotDaveR@cs.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Gammex lasers Message-ID: <11512A2A5407D1118DB300805FA996C440891F@SCMCMAIL> From: Calvin Conn Reply-To: cconn@kih.net To: linac-eng@plato1.aristotle.net Subject: Gammex lasers Date: Thu, 16 Dec 1999 05:55:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all; I have some of the older He-Ne lasers in use. Is anyone out there repairing these or are you just replacing them with the newer diode lasers. If you are repairing them where do you get parts and do you have a schematic for them. I have one that takes a long time to come on. (sometimes) Does anyone already know what the problem is, before I begin to troubleshoot. Calvin R. Conn cconn@kih.net ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Leadite blocks. Message-ID: <4.1.19991216023823.00999150@radonc17.ucsf.edu> From: John Somers To: "S. Murphy" , linac digest Subject: Re: Leadite blocks. Date: Thu, 16 Dec 1999 00:04:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sean, I learned some things about these lead blocks in a departmental renovation/expansion project recently. They are available in the form of interlocking bricks so there are no straight-through joint lines in a shield wall incorporating them. Several thicknesses are available. For general bunker wall construction, they are more expensive than concrete in equivalent shielding thickness, at least in the U.S. One advantage they have is the substantial saving of space, since 1 inch thickness of lead replaces several inches of concrete. One disadvantage you touched on: "High energy" photons (any energy at or above 10 MV) transversing lead will generate a significant intensity of thermal neutrons in the process. This is what I understand by your reference to "neutron scatter" with regard to lead bricks. These neutrons may then have to be absorbed/attenuated by additional shielding in the form of borated polyethylene. This is often include in the makeup of shielding doors for high energy treatment vaults, i.e., lead sheets followed by borated polyethylene. Note that the polyethylene must be on the outside of the lead in order to absorb the generated neutrons. So far as I know there is not an issue with electron treatment beams since any scattered photon intensities reaching a maze or door would be quite low. But all design considerations should be made by a qualified physicist shielding designer. Cautionary note: Someone involved should plan to directly confirm the thickness and placement of lead and polyethylene at the construction site. This includes door, maze, and wall construction. Do NOT assume that the constructed version will match the design plan. I recommend taking photos of the actual configuration as a way of firmly documenting it. Regards, John Somers At 05:02 PM 12/15/99 +0000, S. Murphy wrote: >Hi group, > >As part of our centre's redevelopment programme, we are investigating the >potential use of constructing our bunkers from 'Leadite' blocks. These are >relatively unheard of in the UK but I am lead (no pun intended) to believe >that they are more commonly used in US centres? It is part of my remit to >investigate the feasibility of these blocks with particular emphasis on the >maze door / barrier. I was wondering whether anyone on the digest would like >to offer me some advice or opinions on this material and the use of >motorised maze-doors? On a side note, I have heard several mentions of >'neutron scatter' in the same conversations as Leadite. Can anybody >enlighten me? The highest electron energy we will be running is likely to be >22 MeV. > >All information gratefully received. > >Regards > >Sean Murphy >Senior MTO >RSH Hospital >Southampton >Tel. (+44) 02380 825393 >Fax. (+44) 02380 825650 >UK > >___________________________________________________________ >Disclaimer - > >The information and views expressed in this text are those of the author >alone and should in no way be taken to express those of the Department >or Trust management. >___________________________________________________________ > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Distilled water Message-ID: <3858134C.6119038C@scf.sk.ca> From: S Thiesson To: Chris.Coyle@mail.swedish.org Cc: linac-eng@plato1.aristotle.net Subject: Re: Distilled water Date: Wed, 15 Dec 1999 14:16:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ?? Maybe you refer to 'double distillation'? Chris.Coyle@mail.swedish.org wrote: > Sorry folks but "Steam Distilled" and just "Distilled" water are not the > same thing.............. > I only use "Steam Distilled" water, and have so for many years without > problems. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Distilled water Message-ID: <88256848.005A2EA6.00@ntip01.swedish.org> From: Chris.Coyle@mail.swedish.org To: linac-eng@plato1.aristotle.net Subject: Distilled water Date: Wed, 15 Dec 1999 08:24:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry folks but "Steam Distilled" and just "Distilled" water are not the same thing.............. I only use "Steam Distilled" water, and have so for many years without problems. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water water everywhere Message-ID: <3857DDDC.96F9C737@scf.sk.ca> From: S Thiesson To: Linac eng Subject: Re: water water everywhere Date: Wed, 15 Dec 1999 10:28:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry, forgot to add the following link to my last post. http://www.eimac.com/ab16.htm S Thiesson wrote: > FYI > A fair bit of information can be found at > http://www.high-q.com/pdf/whatwhywhen.pdf > You will need adobe acrobat reader. > The Barnstead | Thermolyne company catalog also has an excellent > discussion on water purification. > We use RO, DI water in our systems (mostly Siemens) with after market > mixed bed DI cartridges. > The Varian unit we have has the original Culligan unit, (for warranty > purposes) even though I am less than impressed with the over all design. > > I have heard this 'too pure' argument before but have never witnessed a > real problem on the Siemens units. > The Varian problem, to me at least, sounds like a manufacturing issue. > > Scot Thiesson > A.B.C.C. > Regina Sask. > Canada > sthiesson@scf.sk.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: water water everywhere Message-ID: <3857D0E6.F48DD381@scf.sk.ca> From: S Thiesson To: Linac eng Subject: water water everywhere Date: Wed, 15 Dec 1999 09:33:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" FYI A fair bit of information can be found at http://www.high-q.com/pdf/whatwhywhen.pdf You will need adobe acrobat reader. The Barnstead | Thermolyne company catalog also has an excellent discussion on water purification. We use RO, DI water in our systems (mostly Siemens) with after market mixed bed DI cartridges. The Varian unit we have has the original Culligan unit, (for warranty purposes) even though I am less than impressed with the over all design. I have heard this 'too pure' argument before but have never witnessed a real problem on the Siemens units. The Varian problem, to me at least, sounds like a manufacturing issue. Scot Thiesson A.B.C.C. Regina Sask. Canada sthiesson@scf.sk.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water leaks Message-ID: <0.ad58c38a.258924d7@aol.com> From: BMic644@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: water leaks Date: Wed, 15 Dec 1999 09:07:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Until recently, I had worked for a Rad Onc group that had several 2100c machines that were of the same vintage of PilotDaveR. We had no trouble with BMag water leaks or klystron water leaks. Early on I had decided that the Culligan system was too clean and conducive to copper erosion. Therefore, I did not change the systems over to Culligan but retained the P154 demineralizer cartridge and changed the water a couple of times a year. These machines are still operating fine after 8 years. I hope someone gets to the bottom of this problem and puts out the proper recommendation for machine longevity. Barry Michael SBHCS Livingston, NJ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Leadite blocks. Message-ID: <000501bf471e$4964d880$f39c8cd4@default> From: "S. Murphy" Reply-To: "S. Murphy" To: linac digest Subject: Leadite blocks. Date: Wed, 15 Dec 1999 09:02:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi group, As part of our centre's redevelopment programme, we are investigating the potential use of constructing our bunkers from 'Leadite' blocks. These are relatively unheard of in the UK but I am lead (no pun intended) to believe that they are more commonly used in US centres? It is part of my remit to investigate the feasibility of these blocks with particular emphasis on the maze door / barrier. I was wondering whether anyone on the digest would like to offer me some advice or opinions on this material and the use of motorised maze-doors? On a side note, I have heard several mentions of 'neutron scatter' in the same conversations as Leadite. Can anybody enlighten me? The highest electron energy we will be running is likely to be 22 MeV. All information gratefully received. Regards Sean Murphy Senior MTO RSH Hospital Southampton Tel. (+44) 02380 825393 Fax. (+44) 02380 825650 UK ___________________________________________________________ Disclaimer - The information and views expressed in this text are those of the author alone and should in no way be taken to express those of the Department or Trust management. ___________________________________________________________ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: From: Randy Niccolls To: PilotDaveR@cs.com, mdenning@emh.org, linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Wed, 15 Dec 1999 07:45:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We replaced a bend magnet about a year ago on our 2100C s/n:224 ....installed in 1991. The cause was a leak in the copper in the energy slit. We were told that the epoxy is not recommended....but on our 2100C s/n:305 ....also 1991 vintage has not developed that problem yet. If it starts leaking I will consider using the epoxy. We have noticed that when we have our culligan cartridges cleaned we have had a lot of copper in them. We have suspected the cartridges are doing to good of a job and causing the leaks. The copper in the energy slit I have been told is a lot more thin than the rest of the water system. Just a thought. We have thought about going back to the original deminerizer cartridges. Has anyone else experianced copper in Their culligan cartridges? These opinions are my own and not anyone elses. Randy Niccolls....... Linac Electronics Tech. Mountain States Tumor Institute Boise, Idaho >>> 12/15/99 12:25AM >>> I have experienced ea. 2100C machines fail in this mode. It was discovered that small perforations formed in the energy slit. They were C2 series machines manufactured in 1991. I'm told that epoxy applied externally might help. Twice this was tried by the OEM and it failed days later. Ouch... We had to purchase new B-mags. I have heard that epoxy can be applied internally by disconnecting the water lines to the Energy Slits and pumping epoxy back and forth to coat the slit walls. It takes approximately 24 hours to cure. I don't have personal experience with this method, but I can tell you anything you want to know about this type of failure, costs, down time, personal failure analysis, etc., etc. All I can say is Good Luck and God Speed... Further Questions? Please respond to PilotDaveR@cs.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water leaks from copper items Message-ID: <3857B3C9.1A747569@wfubmc.edu> From: tcullen@wfubmc.edu To: "Linac Engineers (E-mail)" Subject: Re: water leaks from copper items Date: Wed, 15 Dec 1999 07:29:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" So what you guys are saying is you got the Monday bmags. I use an Amsco electrical powered still for my linac water supply. Located, of all places, in the Rad Onc Conference room. Needless to say it's a conversation piece. To tell the truth I never checked the pH, the conductivity, or even worried about it. This steam distilled water has been used in 2 HE and 2 LE since installation with no major problems associated with water quality. On the other hand I replace the water regularly (1 to 3 times/yr) and have the hoses on a 5 year replacement schedule. If memory serves me right, I have replaced only 1 heat exchanger (recently) in 10 years. Maybe I should start selling this water.....hmmm$$$ 2100C 101 2100C 403 600C 042 600C 081 .....looking for wood..........Do you think this will jinx me right here at the holidays and all? Doug Tymofichuk wrote: > On Wed, 15 Dec 1999 07:30:54 -0800 Jerry Maddox > wrote: > > > > Pure distilled water is very corrosive. But if the > > conductivity is low, electrolytic action should be small. > > If the water is "pure" then the conductivity will be > extremely low by definition. The reason that extremely pure > water is corrosive is that it is a very powerful solvent. > > > In my experience, deionized or steam distilled water > > should not be used, only high quality distilled, based on > > mfr reccommendations. > > > Distilled water is "steam" distilled by definition. Your > statement makes no sense. > > ---------------------- > Doug Tymofichuk > dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water leaks from copper items Message-ID: From: Doug Tymofichuk Reply-To: dougt@CancerBoard.ab.ca To: Jerry Maddox Cc: "'linac-eng@plato.aristotle.net'" Subject: Re: water leaks from copper items Date: Wed, 15 Dec 1999 06:41:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On Wed, 15 Dec 1999 07:30:54 -0800 Jerry Maddox wrote: > Pure distilled water is very corrosive. But if the > conductivity is low, electrolytic action should be small. If the water is "pure" then the conductivity will be extremely low by definition. The reason that extremely pure water is corrosive is that it is a very powerful solvent. > In my experience, deionized or steam distilled water > should not be used, only high quality distilled, based on > mfr reccommendations. > Distilled water is "steam" distilled by definition. Your statement makes no sense. ---------------------- Doug Tymofichuk dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: MouldRoom Mailing List Message-ID: <01BF470B.95D46400@ppp-1-44.cvx6.telinco.net> From: John Macmillan To: 'Linac Eng List' Subject: FW: MouldRoom Mailing List Date: Wed, 15 Dec 1999 06:48:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" May I repeat this? According to my records, it has disappeared, while my other e-mail arrived OK on the list. John Macmillan -----Original Message----- From: John Macmillan [SMTP:jmac@rtphys.abel.co.uk] Sent: 13 December 1999 09:40 To: 'Linac Eng List' Subject: MouldRoom Mailing List I would be grateful to other engineers on the list who know of, or are associated with any mould room staff who do not know of a mailing list like this one, dedicated to Oncology Mould Room issues - to pass on this e-mail address: MouldRoom-subscribe@onelist.com Even though I am an in-house 'linac eng', our department is small, so we get involved in the engineering aspect of the Mould Room. I apologise if I am breaking any 'netiquette rules'. Please e-mail privately. Many Thanks John Macmillan Royal Shrewsbury Hospital UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: water leaks from copper items Message-ID: <199912151335.OAA14799@chimay.radth.ruu.nl> From: Jan Kok To: jmaddox@jcrt.harvard.edu Cc: linac-eng@plato1.aristotle.net Subject: Re: water leaks from copper items Date: Wed, 15 Dec 1999 05:35:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Is it possible to use glycol instead of water? Jan ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: water leaks from copper items Message-ID: <01BF46CE.52970720.jmaddox@jcrt.harvard.edu> From: Jerry Maddox To: "'linac-eng@plato.aristotle.net'" Subject: water leaks from copper items Date: Wed, 15 Dec 1999 07:30:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" No bending magnet slit leaks as yet, 4 2100's from #273 to 719. Very interested in your experiences with the slits. Two targets have developed leaks at the 6x button, which separated from the body, possibly due to thermal cycling. Removed water from the tube and capped the ends to see if the target was at fault. Water freezes in a vacuum and sublimates at a steady rate related to the surface area available, so it looks like a very steady leak. Took quite a while to pump down after repair, due to very slow sublimation rate. We also had a leak inside a sled. Had Varian in to remove it and replace a solenoid elbow, which had a pinhole leak. Some minimal resteering after. Also had a circulator develop leaks, primarily at joints. Epoxy worked well here. I think Devcon liquid steel was used. Leaks from copper parts are a growing concern, being difficult, expensive and time consuming to repair. We are seeing corrosion inside the hoses from the deionizers, we think more since the Culligen deionizer was added. We are starting to check these hoses frequently. A local therapist remarked that his condo had to be completely replumbed, due to use of copper tubing from California, where the codes allow thinner walls than here and the water is less corrosive. Many pinhole leaks. Pure distilled water is very corrosive. But if the conductivity is low, electrolytic action should be small. The indicator lights are a big plus. It is my understanding that only a couple of weeks of poor water can have large effects, particularly on the target. In my experience, deionized or steam distilled water should not be used, only high quality distilled, based on mfr reccommendations. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Leaks in B-mag area.. Message-ID: <0.b778583d.25889c87@cs.com> From: PilotDaveR@cs.com To: mdenning@emh.org, linac-eng@plato1.aristotle.net Subject: Re: Water Leaks in B-mag area.. Date: Tue, 14 Dec 1999 23:25:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have experienced ea. 2100C machines fail in this mode. It was discovered that small perforations formed in the energy slit. They were C2 series machines manufactured in 1991. I'm told that epoxy applied externally might help. Twice this was tried by the OEM and it failed days later. Ouch... We had to purchase new B-mags. I have heard that epoxy can be applied internally by disconnecting the water lines to the Energy Slits and pumping epoxy back and forth to coat the slit walls. It takes approximately 24 hours to cure. I don't have personal experience with this method, but I can tell you anything you want to know about this type of failure, costs, down time, personal failure analysis, etc., etc. All I can say is Good Luck and God Speed... Further Questions? Please respond to PilotDaveR@cs.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: From: Joe Larkin To: linac-eng@plato1.aristotle.net Subject: Date: Mon, 13 Dec 1999 12:32:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, As luck would have it we just experienced exactly the same type of water leak on our 5 yr old CL-2300 C/D, ser no.107. In fact, you could substitute Tim Waldron's description of their water leak for ours. Varian arrived and our first attempt at patching the leak consisted of sanding/scrubbing the copper clean, appying epoxy, placing a copper foil patch and then applying a final coat of epoxy. When the water pump was started again the next morning the leak reappeared. It was speculated at the time that the foil may have lifted slightly before the epoxy had hardened enough. A second attempt was made. The previous patch was peeled off and the area was cleaned again with a soft wire wheel on a Dremel tool to remove the old epoxy followed by a wipe down with 99% ethyl alcohol. The new patch consisted of epoxy/small foil patch/epoxy/larger foil patch/epoxy. As a final measure the "shunt" (small tungsten block) was reinstalled in place next to the energy slit and effectively held the whole patch in place. The shunt is difficult to remove under normal conditions but with it now cemented in place by the epoxy from the patch, it's there for good and any further leak at the same location cannot be repaired (ie; new bmag). The pump was started the next morning and there were no signs of leakage so we put the machine back together and proceeded to check symmetry. We were told that since there was now a double foil patch between the energy slit and the shunt that the shunt may not be resting in it's original location but may be a few thou off. Sure enough, the symmetry was off in both directions but not by much. Tweaked Ang Sym, Ang Gain, Rad Sym, Rad Gain on each energyIt's been three weeks now with no further sign of a leak. We also have a 20 yr old CL-18 but have never had any similar problems. Best of luck. Joe Larkin Montreal General Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Water purity for linacs. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Water purity for linacs. Date: Mon, 13 Dec 1999 11:43:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, I have asked some questions and had some experience with the water purity issue over the last 15 years ( I guess that equates to research). Over the years we have had water related problems like: Leak in acc focus coil of Clinac 6. Leak in target 2100 #40. Leak in slits 2100 #40. None of these leaks were at an early stage of the life of the machine. We always used distilled water for the closed system and here it starts to get interesting. Because of the extreme purity of the water it tends to pull atoms off things by brute force entropy. Making the water quite corrosive. The local water purity people were not at all surprised at the holes in copper from the distilled water. They suggested adding something like a little antifreeze or anti corrosive agent. Unfortunately this would cause water conduction and give BMAG interlocks. Varian also pointed out that due to the extremely high radiation levels at the target there was likelyhood of any chemical being ionised and really stuffing things up. We went with the Varian reccomendations. As to the statistical likelyhood of a leak. The old Clinac6 went to it's 21st birthday with one corrosion related leak. 2100 #40 currently ~10yrs has had 2. 600 #248 currently ~5 no problems. 2100 #1164 currently ~2 no problems A total of 38 Clinacyears with 3 corrosion related leaks. PS Varian welded the slits on old #40 2-Dec-94 and all has been well since. PPS Mike.....With the pump turned off for several days. When the fix was completed the pump would not start. It may be worth while keying one of those up just in case.... Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Message-ID: From: Steve Reliford To: mdenning@emh.org, linac-eng@plato1.aristotle.net Subject: Re: Date: Mon, 13 Dec 1999 11:20:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, we also had a leak of the energy slit last year. We used the epoxy method with great success. Give Steve Schwartz a call for the procedure (800 626-8074). Unfortunately, I can't find my copy. Steve should be able to help. Good luck, Steve ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Message-ID: <0.4ddd7674.25869e48@aol.com> From: Radsrus@aol.com To: sthiesson@scf.sk.ca Cc: mdenning@emh.org, linac-eng@plato1.aristotle.net Subject: Re: Date: Mon, 13 Dec 1999 11:08:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gents, Basically, as Richard mentioned, it involves blowing the lines dry with an air compressor, then taking a very high peel strength epoxy & blowing that thru the lines, back & forth, coating and hopefully plugging the leak. Then waiting the 24 hr cure time, charging up the system with water and repeating the process, if necessary. Trick is not to use too much epoxy so as to cut H20 flow below 2GPM, and to use tygon tubing to extend the lines so you can "see" what your blowing back & forth & makes it easier to connect to the compressor. That's all there is to it - we use a brand of epoxy called "hardman orange bubble pack" - order 24 packets per fix. We have this available if you need it. At the hugely outrageous cost per bend magnet, it doesn't make "cents" not to try this inexpensive fix for the bmag leaks, especially when the new one you get is likely to wear the same way (unless the vendor has "fixed" the problem causing this in the first place). If they have, (fixed the problem, that is) please, somebody, let the list know. Hope this helps & my regards to the list, Steve Schwarz, Acceletronics 800-626-8704 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: In-Room Monitor Message-ID: From: Randy Niccolls To: skeeter135@netzero.net, linac-eng@plato1.aristotle.net Subject: Re: In-Room Monitor Date: Mon, 13 Dec 1999 10:21:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" As our old EGA type in-room monitors went bad....we repleced them with 21" VGA 15 pin and purchase a two-way video/amplifier splitter...one side to consold monitor and the other to to in-room monitor. Take the input to the splitter right off the back of the computer video output and do away with Varians splitter. >>> "Max Maxwell" 12/13/99 09:01AM >>> We have a 2100C with an in-room monitor that is going out. The monitor has a 9 pin connector and appears to be an EGA type. What is the procedure for replacing this monitor with a VGA monitor. I have thought about using a Cybex box and just T-ing off the console video signal. Any thoughts or suggestions would be appreciated. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2100CD energy slit leak Message-ID: From: Randy Wick To: 'Linac-eng list' Subject: Re: 2100CD energy slit leak Date: Mon, 13 Dec 1999 10:03:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Uh-oh. We had this happen on one of our 2100C's s/n 266 about 3 1/2 years ago. The leak was from the slit itself: the copper had worn thin. We called in Varian and they were able to provide someone who brazed the slit shut. It wasn't cheap, but it was much cheaper than a new bending magnet. It seemed like a pretty tricky repair, so I wouldn't have wanted to try it myself. The Varian guy did a great job though: we have had no problem since. As to the cause, that is a bit of a mystery. I know that this has happened to various other sites, but we have another 2100C s/n 265 that is like a twin to 266. Any time something failed on one (water pump, heat exchanger etc.) the same thing happened on the other within a couple of weeks. In this case, we have never had any leaks in the slit area so is the leak due to flawed design, materials ??? who knows. It's interesting that you're seeing this on a fairly new machine. Ours was about 4 years old at the time. One thing I would look at is your water quality in the closed loop. Even with the de-ionizer tank, our water was fairly acid. We later found out that the returned tanks contents were very blue when they were processed: ie full of copper from the waveguide! We eventually went to a dual cartridge system, and refilled the resevoir with distilled rather than de-ionized water. The tanks are changed annually: the water is now almost exactly pH 7 with very little conductivity (< 1 Meg). I think some time back there was a discussion about water quality on the list: at that time someone mentioned they had done a lot of research into the issue. Anyone care to refresh our memories? (PS Since I wrote the above, I have read the replies regarding epoxy, etc. Since it is probably a small leak, it might be worth a try. Maybe some copper foil over the hole first? After all, any thing that gets into the cooling system at that point could cause a blockage with catastrophic consequences. Like Scott, I would also like to hear more about this from anyone who's done this repair) ----------------------------------- Randy Wick Vancouver Cancer Clinic Vancouver, BC Canada rwick@bccancer.bc.ca > -----Original Message----- > From: Denning, Mike [SMTP:mdenning@emh.org] > Sent: Monday, December 13, 1999 6:05 AM > To: Linac-eng (E-mail) > Subject: > > I have a 2100 C/D 1163. We had a water leak at the energy slit down in > the > bowels of the bend magnet. It wasn't a hose fitting or anything you could > see from the outside. Has anyone else had a leak like this and how did > you > repair it? > > Mike Denning > Eastern Maine Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Nuclear Medicine Mailing List Message-ID: <385533F8.3B593589@batelco.com.bh> From: "Sreekumar K.T" To: Linac Eng Listserver Subject: Nuclear Medicine Mailing List Date: Mon, 13 Dec 1999 09:59:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello folks Can anypone suggest me a Nuclear Medicine mailing list or a body where I can get specific info about Iodine 131 therapy. Thanks & Regards Kumar ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Message-ID: <38552AFF.6F4413F1@scf.sk.ca> From: S Thiesson To: Radsrus@aol.com Cc: mdenning@emh.org, linac-eng@plato1.aristotle.net Subject: Re: Date: Mon, 13 Dec 1999 09:21:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Even though we have no problem with a water leak at this time, it might be a good idea to know the procedure anyway? If you would be so kind as to post it to the list? By the way, why not silicone seal or 'seals all' ? It occurs to me that epoxy would behave poorly in a high radiation area. Scot Thiesson Allan Blair Cancer Centre Regina Sask Canada Radsrus@aol.com wrote: > In a message dated 12/13/1999 8:09:55 AM Central Standard Time, > mdenning@emh.org writes: > > > Subj: > > Date: 12/13/1999 8:09:55 AM Central Standard Time > > From: mdenning@emh.org (Denning, Mike) > > Sender: owner-linac-eng@plato1.aristotle.net > > To: linac-eng@plato1.aristotle.net (Linac-eng (E-mail)) > > > > I have a 2100 C/D 1163. We had a water leak at the energy slit down in > > the > > bowels of the bend magnet. It wasn't a hose fitting or anything you could > > see from the outside. Has anyone else had a leak like this and how did you > > repair it? > > > > Mike Denning > > Eastern Maine Medical Center > > > > Mike, depending on the location & the severity of the leak, you may be able > to successfully epoxy the leak. Of course, the real answer here is to find > out why the leaks are occuring - hopefully the vendor will come up with that > info. > > I've heard the vendor does not sanction the epoxy fix but then I also heard > that after the successes we've had, they've started doing it themselves - so > I don't know which rumor is true.... What's really odd is that I've heard > some other machines in your S/N range are experiencing the same types of > problems. Go figure. > > If you would like to know how the epoxy fix is done, feel free to give me a > call. > > Rgds, Steve Schwarz, Acceletronics 800-626-8074. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian HE Energy slit water leak Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D831@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'Denning, Mike'" , "Linac-eng (E-mail)" Subject: RE: Varian HE Energy slit water leak Date: Mon, 13 Dec 1999 08:55:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes.....I believe that Acceletronics has a fix for this that has worked well. Contact them for details. From what I recall, it was a matter of blowing in epoxy resin and sealing the leak. It has worked on 2 HE linacs that I know of. Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Denning, Mike [mailto:mdenning@emh.org] Sent: Monday, December 13, 1999 8:05 AM To: Linac-eng (E-mail) Subject: I have a 2100 C/D 1163. We had a water leak at the energy slit down in the bowels of the bend magnet. It wasn't a hose fitting or anything you could see from the outside. Has anyone else had a leak like this and how did you repair it? Mike Denning Eastern Maine Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: bmag leak Message-ID: <86256846.005AB6B2.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Subject: bmag leak Date: Mon, 13 Dec 1999 08:17:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have heard of a number of these, the pattern being that the leak occurs on the side of the slit assembly that is "up" when the gantry is at 270 IEC (9 o'clock). To observe this we had to "strip" the bmag and remove the iron magnetic "shield" at the front of the vacuum chamber. With the gantry at 270 IEC, ours leaked on the vertical surface approximatley 2/3 back from the front of the slit assembly. It was a pinhole shooting one of the smallest jets of water I've ever seen. When we had this happen to us in January on our CL2100C SN492, we opted to replace the bending magnet. I've been told that a successful repair of this has been made in a number of cases using a "scrubbie", copper leaf, and epoxy. We felt that for a 5-year old machine the bmag replacement was a justified expense. If this had occurred on our 10-year old SN 095, we probably would have gone the epoxy route. Prior to today, I was under the impression that this problem was restricted to machines with serial numbers near 500. I am rather suprised (and disappointed) at this occurring in such a recently-manufactured machine. It will be interesting to know if the leak on your machine is very similar to the one we experienced, Mike. (Insert exhortations to Varian to examine their design, along with any other splenic commentary apropriate for Monday morning here). Best of luck with it. Tim Waldron ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Message-ID: <0.cb2e2f38.2586775f@aol.com> From: Radsrus@aol.com To: mdenning@emh.org, linac-eng@plato1.aristotle.net Subject: Re: Date: Mon, 13 Dec 1999 08:22:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In a message dated 12/13/1999 8:09:55 AM Central Standard Time, mdenning@emh.org writes: > Subj: > Date: 12/13/1999 8:09:55 AM Central Standard Time > From: mdenning@emh.org (Denning, Mike) > Sender: owner-linac-eng@plato1.aristotle.net > To: linac-eng@plato1.aristotle.net (Linac-eng (E-mail)) > > I have a 2100 C/D 1163. We had a water leak at the energy slit down in > the > bowels of the bend magnet. It wasn't a hose fitting or anything you could > see from the outside. Has anyone else had a leak like this and how did you > repair it? > > Mike Denning > Eastern Maine Medical Center > Mike, depending on the location & the severity of the leak, you may be able to successfully epoxy the leak. Of course, the real answer here is to find out why the leaks are occuring - hopefully the vendor will come up with that info. I've heard the vendor does not sanction the epoxy fix but then I also heard that after the successes we've had, they've started doing it themselves - so I don't know which rumor is true.... What's really odd is that I've heard some other machines in your S/N range are experiencing the same types of problems. Go figure. If you would like to know how the epoxy fix is done, feel free to give me a call. Rgds, Steve Schwarz, Acceletronics 800-626-8074. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: In-Room Monitor Message-ID: <003501bf4583$46cf8260$f6e01f26@louie> From: Max Maxwell To: Linac Eng Subject: In-Room Monitor Date: Mon, 13 Dec 1999 08:01:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a 2100C with an in-room monitor that is going out. The monitor has a 9 pin connector and appears to be an EGA type. What is the procedure for replacing this monitor with a VGA monitor. I have thought about using a Cybex box and just T-ing off the console video signal. Any thoughts or suggestions would be appreciated. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Date: Mon, 13 Dec 1999 06:05:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a 2100 C/D 1163. We had a water leak at the energy slit down in the bowels of the bend magnet. It wasn't a hose fitting or anything you could see from the outside. Has anyone else had a leak like this and how did you repair it? Mike Denning Eastern Maine Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Thanks about the TBI Message-ID: <001301bf4563$fe179360$a874fea9@batelco.com.bh.batelco.com.bh> From: Rene Agbayani Reply-To: Rene Agbayani To: linac-eng@plato1.aristotle.net Subject: Thanks about the TBI Date: Mon, 13 Dec 1999 02:31:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Hello Group, Thank you very much for those who responded to me about the issues concerning our problem with the TBI. The messages were so informative that helped us come up with our decision. Finally, we settled into a compromise that the distance of the isocenter to the wall for this purpose be at 3.5m. This is the maximum that we can get from the design. Extending it 5.0m will have to reconstruct the plinth level which is already existing. More power to the group. Thanks again and best regards, Rene P. Agbayani Medical Physics Engineer MED-MOH Bahrain ------_=_NextPart_002_01C19966.172FB140 Content-Type: image/gif; name="ATT12898.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="ATT12898.gif" Content-ID: <001d01bf4555$352ad740$d1f2fea9@batelco.com.bh.batelco.com.bh> Content-Location: ATT-0-82544732F4B0D3119D9B00805FCB5F15-A TT12898.gif R0lGODlhFAAUAPcAAP//////zP//mf//Zv//M///AP/M///MzP/Mmf/MZv/MM//MAP+Z//+ZzP+Z mf+ZZv+ZM/+ZAP9m//9mzP9mmf9mZv9mM/9mAP8z//8zzP8zmf8zZv8zM/8zAP8A//8AzP8Amf8A Zv8AM/8AAMz//8z/zMz/mcz/Zsz/M8z/AMzM/8zMzMzMmczMZszMM8zMAMyZ/8yZzMyZmcyZZsyZ M8yZAMxm/8xmzMxmmcxmZsxmM8xmAMwz/8wzzMwzmcwzZswzM8wzAMwA/8wAzMwAmcwAZswAM8wA AJn//5n/zJn/mZn/Zpn/M5n/AJnM/5nMzJnMmZnMZpnMM5nMAJmZ/5mZzJmZmZmZZpmZM5mZAJlm /5lmzJlmmZlmZplmM5lmAJkz/5kzzJkzmZkzZpkzM5kzAJkA/5kAzJkAmZkAZpkAM5kAAGb//2b/ zGb/mWb/Zmb/M2b/AGbM/2bMzGbMmWbMZmbMM2bMAGaZ/2aZzGaZmWaZZmaZM2aZAGZm/2ZmzGZm mWZmZmZmM2ZmAGYz/2YzzGYzmWYzZmYzM2YzAGYA/2YAzGYAmWYAZmYAM2YAADP//zP/zDP/mTP/ ZjP/MzP/ADPM/zPMzDPMmTPMZjPMMzPMADOZ/zOZzDOZmTOZZjOZMzOZADNm/zNmzDNmmTNmZjNm MzNmADMz/zMzzDMzmTMzZjMzMzMzADMA/zMAzDMAmTMAZjMAMzMAAAD//wD/zAD/mQD/ZgD/MwD/ AADM/wDMzADMmQDMZgDMMwDMAACZ/wCZzACZmQCZZgCZMwCZAABm/wBmzABmmQBmZgBmMwBmAAAz /wAzzAAzmQAzZgAzMwAzAAAA/wAAzAAAmQAAZgAAMwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACwAAAAAFAAUAEAIQwBJCBxI sKBBAAgTKlyYUCDDhwsdQpwoceLDihYjksh4cSNHjR9BhmzocSQAjCFRflTJkWVGlxZhUiw5UiZE gzhzBgQAOw== ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: LAP Lasers Message-ID: <01bf455f$92ce3360$0f155691@pc_559> From: "MST, afd. Radiotherapie" Reply-To: "MST, afd. Radiotherapie" To: Chris.Coyle@mail.swedish.org, linac-eng@plato1.aristotle.net Subject: Re: LAP Lasers Date: Mon, 13 Dec 1999 03:45:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Chris.Coyle@mail.swedish.org To: linac-eng@plato1.aristotle.net Date: vrijdag 10 december 1999 22:42 Subject: LAP Lasers >Anyone have an address/ phone number for LAP ???? > >Hello Chris and all on the list. The adress/phone number for LAP in Germany is: LAP gmbh Laser Applikationen Zeppelinstrasse 23 D-21337 Luneburg (Germany) Tel: 04131 - 951195 Fax: 04131 - 951196 Ronald Bossink Medical Physics Engineer MST - Enschede The Netherlands > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RT100 Message-ID: <01BF4552.0FA57640@ppp-1-62.cvx2.telinco.net> From: John Macmillan To: 'Linac Eng List' Subject: RT100 Date: Mon, 13 Dec 1999 02:07:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Regarding a problem we had with or RT100 a few months ago :- "Our RT100 output mA is intermittently dropping from 8 to 4 on 100KV and 10 to 6 on the rest for more than a few seconds - sometimes up to a minute. Therefore, the problem is not specific to any one energy." It has finally deteriorated over the last few weeks and has now been withdrawn from service. After carrying out the 'easiest' options for repair (thanks list), Philips are adamant it is the filament breaking down in the tube. Good News: They may be able to recondition the tube in Hamburg. But I am still awaiting details and price. John Macmillan Radiotherapy Physics Royal Shrewsbury Hospital UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Clinac 6/100 Yield faults Message-ID: <9912130306.AB29647@yoyo.rah.sa.gov.au> From: David Horsman To: linac-eng@plato1.aristotle.net Subject: Re: Clinac 6/100 Yield faults Date: Sun, 12 Dec 1999 18:46:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all who replied, thanks for the advice. It turns out that our problem is due to the magnetron output dropping over time. I don't know how this was missed before as two people (myself being one of them) checked the forward power with the Yield servo off and didn't notice any drop over time. This was one of the first things that was checked. Anyway, we checked the forward power again, just to be sure, and saw a steady drop in output. The magnetron current is very stable with the Yield servo off. (Yes, I double checked this as well.) Is this a typical symptom of "old age" in a magnetron? ie. Output dropping with temperature? David Horsman Medical Physics Royal Adelaide Hospital Ph +61 8 8222 4188 Fx +61 8 8222 5937 dhorsman@cancer.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Nucletron Therapax 150 Message-ID: <007501bf43b3$a77171e0$0100005a@pacbell.net> From: Domenic Greco To: Brian Whitlock , linac-eng@plato1.aristotle.net Subject: Re: Nucletron Therapax 150 Date: Sat, 11 Dec 1999 00:42:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To my understanding, a supply trip is indicative of tube arcing. Remove HV cable at tube and check for carbon tracks. Or else, it could be gassy tube. I just finished troubleshooting intermittent "under mA" faults which ended up being a poor connection at the tube contacts. Regards, Domenic Greco Radiation ELectronics, Inc dgreco@pacbell.net ----- Original Message ----- From: Brian Whitlock To: Sent: Wednesday, December 01, 1999 12:46 AM Subject: Re: Nucletron Therapax 150 > We have a Pantak Therapax 150, assuming it is the same, these faults often occur on warmup and are often just glitches that can be ignored. > However we have had some which have been more serious, but this is usually flagged by some other fault when you try to continue, or run in manual mode IE under mA etc. > Check the following if you haven't already done so, remove ht cable at tube end and check cable and insert for tracking, ensure cable is not over tightened causing a compression fault. > Many other things can also cause this fault to show, but running in manual mode usually shows the real cause. > We have had, flywheel diodes fail in the inverter ( must be a matched pair), fil series regulator failure, Fil switching PCB relay faults etc etc. > Good luck > > Brian Whitlock > MTO > > > Radiotherapy Physics > Poole Hospital > > >>> "Joe Czarnecki" 11/30/99 04:03pm >>> > Hello group, > > I would like to know if other owners of Therapax 150's have "supply trip" interlocks. We keep getting them and our machine was installed in September and has been down several days at a time. I do believe no patients have completed treatment on this machine. I would like feedback to other peoples problems. > > Thanks, > Joe Czarnecki > RISS III > BJC Health Systems Clinical Engineering > St. Louis, MO 63110 > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: lasers, corrected Message-ID: <4.1.19991210211914.00969620@radonc17.ucsf.edu> From: John Somers To: Richard , "Barnes, Bill" , "'Vanek, Kenneth'" Cc: "Linac-Eng (E-mail)" Subject: Re: lasers, corrected Date: Fri, 10 Dec 1999 18:43:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 09:58 PM 12/8/99 -0600, Richard wrote: >Has anyone evaluated lasers from LAP? We are looking seriously into these. >Even sales from Scanditronix mentioned that if you wanted the best, buy LAP. > >Thanks. >Richard Kimball > Richard, Bill and all on the list, We have lasers from LAP in our CT room. These are the motorized moving lasers which are referenced to isocenter of the scanner and take input data (offsets), move the laser lines to the planned treatment isocenter on the patient, and allow precise marking or tatooing of the patient's skin. Gammex RMI has a similar product. I am familiar only with the LAP version, and it is indeed very good. Currently the CT tech inputs the offsets manually after bringing them up on the treatment planning workstation. Coming, supposedly soon, is a direct transfer of this data from the ADAC Pinnacle treatment planning system to the LAP system. The only problem we have had is occasional bumping of one of the wall units when patients are moved around on guerneys. For our new cancer center the lasers will be recessed to avoid this. LAP also has fixed-position treatment room lasers, including a high-end version that has motorized alignment motions. Six small motors, no more manual adjustments. No experience here with those. Apparently LAP, which is sourced in Germany, has discontinued using green diodes for now, but does use red diodes in some of their products. U.S. contact: LAP of America, Inc., Boca Raton Fl, (561) 416-9250 http://www.LAP-Laser.com John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: lasers, corrected Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D82D@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'John Somers' Cc: "Linac-Eng (E-mail)" Subject: RE: lasers, corrected Date: Fri, 10 Dec 1999 09:46:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" diode pumped solid state green lasers are available from LAP. We have a quote list of $3995 for the motorized version. Good to hear that folks are happy with the LAP design. We are reoutfitting our PQ5000 with the CT1 system. Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: John Somers [mailto:somers@radonc17.ucsf.edu] Sent: Friday, December 10, 1999 8:43 PM To: Richard; Barnes, Bill; 'Vanek, Kenneth' Cc: Linac-Eng (E-mail) Subject: Re: lasers, corrected At 09:58 PM 12/8/99 -0600, Richard wrote: >Has anyone evaluated lasers from LAP? We are looking seriously into these. >Even sales from Scanditronix mentioned that if you wanted the best, buy LAP. > >Thanks. >Richard Kimball > Richard, Bill and all on the list, We have lasers from LAP in our CT room. These are the motorized moving lasers which are referenced to isocenter of the scanner and take input data (offsets), move the laser lines to the planned treatment isocenter on the patient, and allow precise marking or tatooing of the patient's skin. Gammex RMI has a similar product. I am familiar only with the LAP version, and it is indeed very good. Currently the CT tech inputs the offsets manually after bringing them up on the treatment planning workstation. Coming, supposedly soon, is a direct transfer of this data from the ADAC Pinnacle treatment planning system to the LAP system. The only problem we have had is occasional bumping of one of the wall units when patients are moved around on guerneys. For our new cancer center the lasers will be recessed to avoid this. LAP also has fixed-position treatment room lasers, including a high-end version that has motorized alignment motions. Six small motors, no more manual adjustments. No experience here with those. Apparently LAP, which is sourced in Germany, has discontinued using green diodes for now, but does use red diodes in some of their products. U.S. contact: LAP of America, Inc., Boca Raton Fl, (561) 416-9250 http://www.LAP-Laser.com John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: [Fwd: Beam Geometry] Message-ID: <38512FA3.F353A9FD@wfubmc.edu> From: tcullen@wfubmc.edu To: "Linac Engineers (E-mail)" Subject: [Fwd: Beam Geometry] Date: Fri, 10 Dec 1999 08:51:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Joe, neither, the AR reading in the MC is the analog meter (can also be > seen in service mode) which is termed "ang r mtr" in the drawings. This > comes from the steering amps in the aux electronics chassis and is a > feedback signal from the coils. Don't quote me on this but I remember > something about 1V/1A??? When tracing this signal you also have to use > some of the "jump" logic to find what goes where because the drawings > don't lead you by the hand. As far as I know it would have to be a more > sophisticated system than what Varian deploys to tell you the actual > beam angle. The program pot is a reference control voltage from each > program pcb that is summed on the input of the steering amp pcb with the > neg fb from the coils. Hope this helps. > > Joe Czarnecki wrote: > > > Hello group, > > I am not sure my first one got out, but I am resending > > it anyway. I am having a discussion with a co-worker > > about what "ANGLE RAD" on the morning checkout form > > represents. Does it represent actual beam angle or a > > representation of the voltage on the program pot "ANG > > R"? > > > > Thanx in advance, > > Joe Czarnecki > > RISS III > > BJC Health Systems/Mallinckrodt Institute of Radiology > > St. Louis, MO > > > > __________________________________________________ > > Do You Yahoo!? > > Thousands of Stores. Millions of Products. All in one place. > > Yahoo! Shopping: http://shopping.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Total Body Irraddiation. Message-ID: From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Cc: "'repag@pacific.net.ph'" Subject: FW: Total Body Irraddiation. Date: Fri, 10 Dec 1999 06:40:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Price, Robert Sent: Friday, December 10, 1999 9:38 AM To: Barnes, Bill Subject: RE: Total Body Irraddiation. Rene, A 3 meter treatment distance may severely limit your patient positioning ability during a TBI treatment since at this distance a 40 cm long f.s. projects to under 4 feet. The same 40 cm field will project to approximately 6.5 feet at 5 meters. There are many issues concerning TBI and a great deal of literature for support. The following is a good place to start: Physics Considerations for Total Body Irradiation, James M. Galvin, in Advances in Radiation Oncology Physics, Dosimetry, Treatment Planning and Brachytherapy, ed. James A. Purdy, Ph.D. AAPM Monograph No. 19, American Institute of Physics (publisher) 1992, pp 289-306. I hope this helps. Robert A. Price Jr., Ph.D. Medical Physicist Department of Radiation Oncology Fox Chase Cancer Center 7701 Burholme Avenue Philadelphia, PA 19111 Phone: (215) 728-2819 Fax: (215) 728-4789 email: r_price@fccc.edu -----Original Message----- From: Barnes, Bill Sent: Wednesday, December 08, 1999 4:29 PM To: Price, Robert Subject: FW: Total Body Irraddiation. Bob, I thought you might like to answer this one. Bil -----Original Message----- From: Rene Agbayani [mailto:repag@pacific.net.ph] Sent: Tuesday, December 07, 1999 4:55 AM To: linac-eng@plato1.aristotle.net Subject: Total Body Irraddiation. Hello to you guys, We are having a big debate about the requirement for Total Body Irridiation bunker design. Can you please help us here?? We are going to house a Clinac 600C/D machine in a room having 3.06 m on one side and 2.9 m on the other side of the wall. According to Varian, the 3.06m length is sufficent for TBI. The physicist here insist of approximately 5.0 distance from the isocenter to the wall. I have never seen a patient being treated with TBI. What does really matters about treating with TBI. What can be done if you have a limited space of 3.0m?? What can be the minimum distance needed for TBI patients?? Can you please advice. Thanks, Rene Agbayani Medical Physics Engineer MED-MOH Bahrain ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Beam Geometry Message-ID: <0.cc923869.25817347@aol.com> From: Accelinear@aol.com To: joe_cz_99@yahoo.com, linac-eng@plato1.aristotle.net Subject: Re: Beam Geometry Date: Thu, 9 Dec 1999 13:04:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" It represents neither value you have stated. The Ang R number at the cardrack or on the monitor represents the amount of current flowing in that circuit. It will vary for each energy depending on the program pot. setting and the feedback the servos are sending. Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: LAP lasers. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: LAP lasers. Date: Thu, 9 Dec 1999 12:54:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, We have one of LAP laser. It is a most excellently engineered piece of work. I would reccommend it to anyone. Every adjustment has a fine tweeker on it and the case is sealed and heavily engineered. Ours has been running now for 1 year and has had no problems. The beam does not seem to move with warm-up. As for very long term reliability and stability I cannot comment. Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Beam Geometry Message-ID: <0002DA7B.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net, Joe Czarnecki Subject: Re: Beam Geometry Date: Thu, 9 Dec 1999 14:36:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Neither. I'm not sure what you mean by "beam angle," but if you're refering to beam symmetry that's represented by SYMM RAD (SYMM TRANS in the other plane.) Even then SYMM RAD/TRANS aren't truely representive of beam symmetry; it's the percent of deviation from a preset value, that value being where the beam was steered and the drivers balanced. If you measure the ANG R value at the pot on the program board chances are that is does not equal the value of ANGLE RAD on your morning checkout. ANGLE RAD is a representative value of how much current the driver is drawing. If this value has changed (relative to previous values) then something has changed and the driver is drawing a different current to steer the beam back to the same position in order to maintain symmetry. It has been my experience that if the absolute value is higher than before then the driver is working harder to steer the beam. This can be caused by numerous things. Of course, you can have relatively high ANGLE RAD values (-1.15 vs. .03) in the higher energies, especially 20e. At these higher energies it takes more current to bend the beam 270 degrees. Just remember that it's not the value of ANGLE RAD that's important but a change in value. Flip your ANG R servos off and chances are you'll see the ANGLE RAD values go to zero and your percent symmetry change will climb. Get ready for an EXQ1.....! Hope this helps. Kerry Price Lutheran General Hospital Park Ridge, Illinois USA ______________________________ Reply Separator _________________________________ Subject: Beam Geometry Author: Joe Czarnecki at PO_EXTERNET Date: 12/9/99 11:34 AM Hello group, I am not sure my first one got out, but I am resending it anyway. I am having a discussion with a co-worker about what "ANGLE RAD" on the morning checkout form represents. Does it represent actual beam angle or a representation of the voltage on the program pot "ANG R"? Thanx in advance, Joe Czarnecki RISS III BJC Health Systems/Mallinckrodt Institute of Radiology St. Louis, MO __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: lasers, corrected Message-ID: From: "Barnes, Bill" To: 'Richard' Cc: "Linac-Eng (E-mail)" Subject: RE: lasers, corrected Date: Thu, 9 Dec 1999 10:33:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry Richard, that is one we did not test. Why are they better than the Scanditronix Emeralds? Bill Barnes Fox Chase Cancer Center -----Original Message----- From: Richard [mailto:rkimball@radonc-uc-po.mcis.uchicago.edu] Sent: Wednesday, December 08, 1999 9:58 PM To: Barnes, Bill; 'Vanek, Kenneth' Cc: Linac-Eng (E-mail) Subject: Re: lasers, corrected Has anyone evaluated lasers from LAP? We are looking seriously into these. Even sales from Scanditronix mentioned that if you wanted the best, buy LAP. Thanks. Richard Kimball ----- Original Message ----- From: "Barnes, Bill" To: "'Vanek, Kenneth'" Cc: "Linac-Eng (E-mail)" Sent: Wednesday, December 08, 1999 4:46 PM Subject: RE: lasers, corrected > For everyone's information; I have had many request about my posting on > lasers. So here is the information I have, hope that it helps you. > > We have had the green diode lasers in about four months now, with no > problems. > The warranty from Scanditronix is 2 years. " > http://www.scxmedical.se/scxduro.html " This is the web address of > Scanditronix is you want to see them for yourself. > > The Scanditronix Duroline Laser manual states "EXPECTED LIFETIME FOR LASER > IS 5 YEARS DURING NORMAL USE. 5000 HOURS CONTINUOUS OPERATION." > > This is a different type of solid state diode, that is supposed to last > longer, opererate at a cooler temp and emit a brighter beam. It operates in > the 532 nm wavelength with an output of 1.0 mW. The Green is VERY VISIBLE > with normal room lights on, and it projects a linear beamwidth of over 8 > feet at isocenter. None of the other lasers we tested would do that, I can > not mention specific names, but we did look at all that were available. > > If anyone would be interested in visiting our new center, we will be open > soon and I would make arrangements for a tour. > > > > > > Bill Barnes B.S.E.E. > BIO ENGINEER > FOX CHASE CANCER CENTER PHILADELPHIA > 215-728-2997 > 215-728-4789 FAX > B_BARNES@FCCC.EDU > > -----Original Message----- > From: Vanek, Kenneth [mailto:vanek@radonc.musc.edu] > Sent: Wednesday, December 08, 1999 12:07 PM > To: 'B_Barnes@FCCC.EDU' > Cc: Nelson, Steve > Subject: FW: lasers, corrected > > > Bill: > > How long have you had the green diodes? Many claims have been verbally made > about their longevity, but the written warranty has been the same as the gas > lasers. I really like the green lasers, but the short lifetime of the tube > type (Gammex) made them very expensive to purchase and maintain. > > Kenneth N. Vanek, Ph.D. > Associate Chairman > Department of Radiation Oncology > Medical University of South Carolina > 169 Ashley Avenue > P.O. Box 250318 > Charleston, S.C. 29425-0721 > > Email: vanek@radonc.musc.edu > Office: 843-792-3273 > FAX: 843-792-5498 > > > -------------------------------------------------------------------------- -- > -------------------------- > "Only by opening our mind to the possibility that we are not seeing > everything > will we be able to see what we are missing." Steven Covey 1997 calendar > -------------------------------------------------------------------------- -- > -------------------------- > > > > -----Original Message----- > > From: Nelson, Steve > > Sent: Tuesday, November 30, 1999 8:21 AM > > To: Vanek, Kenneth > > Subject: FW: lasers, corrected > > > > FYI > > > > -----Original Message----- > > From: Barnes, Bill [SMTP:B_Barnes@FCCC.EDU] > > Sent: Friday, November 26, 1999 9:01 AM > > To: 'John Somers' > > Cc: Linac-Eng (E-mail) > > Subject: RE: lasers, corrected > > > > Hello John, > > > > We installed the Scanditronix Emerald lasers(15 of them)(Green), they are > > a > > diode laser with sub millimeter line thickness. We looked at all > > available > > lasers and chose the Emeralds over everyone else because of the clarity, > > projected line length,thickness and visibility. I would highly recommend > > them. The green laser is great because it is VERY VISIBLE in all > > situations > > > > > > BILL BARNES > > BIO ENGINEER > > FOX CHASE CANCER CENTER PHILADELPHIA > > 215-728-2997 > > > > > > > > -----Original Message----- > > From: John Somers [mailto:somers@radonc17.ucsf.edu] > > Sent: Thursday, November 25, 1999 12:21 AM > > To: linac-eng@plato1.aristotle.net > > Subject: Fwd: lasers, corrected > > > > > > Somehow I seem to have deleted the word "diode" from my original message. > > As some people figured out, that's what I was trying to ask about. So > > here > > it is corrected. > > > > > >Good day to all, > > > We are fitting up a new facility with 3 new linac rooms. Does > > anyone have > > >experience with using wall-mounted DIODE lasers instead of the plasma > > tube > > >lasers? I'm wondering if they might give better long-term reliability? > > > Thanks for any info. > > > > > > John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Beam Geometry Message-ID: <19991209173415.11636.qmail@web1306.mail.yahoo.com> From: Joe Czarnecki To: linac-eng@plato1.aristotle.net Subject: Beam Geometry Date: Thu, 9 Dec 1999 09:34:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello group, I am not sure my first one got out, but I am resending it anyway. I am having a discussion with a co-worker about what "ANGLE RAD" on the morning checkout form represents. Does it represent actual beam angle or a representation of the voltage on the program pot "ANG R"? Thanx in advance, Joe Czarnecki RISS III BJC Health Systems/Mallinckrodt Institute of Radiology St. Louis, MO __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: lasers, corrected Message-ID: <001b01bf41f9$9a96cee0$94c6d6d8@pavilion> From: Richard Reply-To: Richard To: "Barnes, Bill" , "'Vanek, Kenneth'" Cc: "Linac-Eng (E-mail)" Subject: Re: lasers, corrected Date: Wed, 8 Dec 1999 19:58:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Has anyone evaluated lasers from LAP? We are looking seriously into these. Even sales from Scanditronix mentioned that if you wanted the best, buy LAP. Thanks. Richard Kimball ----- Original Message ----- From: "Barnes, Bill" To: "'Vanek, Kenneth'" Cc: "Linac-Eng (E-mail)" Sent: Wednesday, December 08, 1999 4:46 PM Subject: RE: lasers, corrected > For everyone's information; I have had many request about my posting on > lasers. So here is the information I have, hope that it helps you. > > We have had the green diode lasers in about four months now, with no > problems. > The warranty from Scanditronix is 2 years. " > http://www.scxmedical.se/scxduro.html " This is the web address of > Scanditronix is you want to see them for yourself. > > The Scanditronix Duroline Laser manual states "EXPECTED LIFETIME FOR LASER > IS 5 YEARS DURING NORMAL USE. 5000 HOURS CONTINUOUS OPERATION." > > This is a different type of solid state diode, that is supposed to last > longer, opererate at a cooler temp and emit a brighter beam. It operates in > the 532 nm wavelength with an output of 1.0 mW. The Green is VERY VISIBLE > with normal room lights on, and it projects a linear beamwidth of over 8 > feet at isocenter. None of the other lasers we tested would do that, I can > not mention specific names, but we did look at all that were available. > > If anyone would be interested in visiting our new center, we will be open > soon and I would make arrangements for a tour. > > > > > > Bill Barnes B.S.E.E. > BIO ENGINEER > FOX CHASE CANCER CENTER PHILADELPHIA > 215-728-2997 > 215-728-4789 FAX > B_BARNES@FCCC.EDU > > -----Original Message----- > From: Vanek, Kenneth [mailto:vanek@radonc.musc.edu] > Sent: Wednesday, December 08, 1999 12:07 PM > To: 'B_Barnes@FCCC.EDU' > Cc: Nelson, Steve > Subject: FW: lasers, corrected > > > Bill: > > How long have you had the green diodes? Many claims have been verbally made > about their longevity, but the written warranty has been the same as the gas > lasers. I really like the green lasers, but the short lifetime of the tube > type (Gammex) made them very expensive to purchase and maintain. > > Kenneth N. Vanek, Ph.D. > Associate Chairman > Department of Radiation Oncology > Medical University of South Carolina > 169 Ashley Avenue > P.O. Box 250318 > Charleston, S.C. 29425-0721 > > Email: vanek@radonc.musc.edu > Office: 843-792-3273 > FAX: 843-792-5498 > > > -------------------------------------------------------------------------- -- > -------------------------- > "Only by opening our mind to the possibility that we are not seeing > everything > will we be able to see what we are missing." Steven Covey 1997 calendar > -------------------------------------------------------------------------- -- > -------------------------- > > > > -----Original Message----- > > From: Nelson, Steve > > Sent: Tuesday, November 30, 1999 8:21 AM > > To: Vanek, Kenneth > > Subject: FW: lasers, corrected > > > > FYI > > > > -----Original Message----- > > From: Barnes, Bill [SMTP:B_Barnes@FCCC.EDU] > > Sent: Friday, November 26, 1999 9:01 AM > > To: 'John Somers' > > Cc: Linac-Eng (E-mail) > > Subject: RE: lasers, corrected > > > > Hello John, > > > > We installed the Scanditronix Emerald lasers(15 of them)(Green), they are > > a > > diode laser with sub millimeter line thickness. We looked at all > > available > > lasers and chose the Emeralds over everyone else because of the clarity, > > projected line length,thickness and visibility. I would highly recommend > > them. The green laser is great because it is VERY VISIBLE in all > > situations > > > > > > BILL BARNES > > BIO ENGINEER > > FOX CHASE CANCER CENTER PHILADELPHIA > > 215-728-2997 > > > > > > > > -----Original Message----- > > From: John Somers [mailto:somers@radonc17.ucsf.edu] > > Sent: Thursday, November 25, 1999 12:21 AM > > To: linac-eng@plato1.aristotle.net > > Subject: Fwd: lasers, corrected > > > > > > Somehow I seem to have deleted the word "diode" from my original message. > > As some people figured out, that's what I was trying to ask about. So > > here > > it is corrected. > > > > > >Good day to all, > > > We are fitting up a new facility with 3 new linac rooms. Does > > anyone have > > >experience with using wall-mounted DIODE lasers instead of the plasma > > tube > > >lasers? I'm wondering if they might give better long-term reliability? > > > Thanks for any info. > > > > > > John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: LASERS Message-ID: From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: LASERS Date: Wed, 8 Dec 1999 15:08:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" BTW... we purchased them through Frank Barker Associates 33 Jacksonville Rd. Bldg 1 Towaco NJ 07082 800-2-BARKER 973-335-1225 fax Bill Barnes Fox Chase Cancer Center Philadelphia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: lasers, corrected Message-ID: From: "Barnes, Bill" To: "'Vanek, Kenneth'" Cc: "Linac-Eng (E-mail)" Subject: RE: lasers, corrected Date: Wed, 8 Dec 1999 14:46:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For everyone's information; I have had many request about my posting on lasers. So here is the information I have, hope that it helps you. We have had the green diode lasers in about four months now, with no problems. The warranty from Scanditronix is 2 years. " http://www.scxmedical.se/scxduro.html " This is the web address of Scanditronix is you want to see them for yourself. The Scanditronix Duroline Laser manual states "EXPECTED LIFETIME FOR LASER IS 5 YEARS DURING NORMAL USE. 5000 HOURS CONTINUOUS OPERATION." This is a different type of solid state diode, that is supposed to last longer, opererate at a cooler temp and emit a brighter beam. It operates in the 532 nm wavelength with an output of 1.0 mW. The Green is VERY VISIBLE with normal room lights on, and it projects a linear beamwidth of over 8 feet at isocenter. None of the other lasers we tested would do that, I can not mention specific names, but we did look at all that were available. If anyone would be interested in visiting our new center, we will be open soon and I would make arrangements for a tour. Bill Barnes B.S.E.E. BIO ENGINEER FOX CHASE CANCER CENTER PHILADELPHIA 215-728-2997 215-728-4789 FAX B_BARNES@FCCC.EDU -----Original Message----- From: Vanek, Kenneth [mailto:vanek@radonc.musc.edu] Sent: Wednesday, December 08, 1999 12:07 PM To: 'B_Barnes@FCCC.EDU' Cc: Nelson, Steve Subject: FW: lasers, corrected Bill: How long have you had the green diodes? Many claims have been verbally made about their longevity, but the written warranty has been the same as the gas lasers. I really like the green lasers, but the short lifetime of the tube type (Gammex) made them very expensive to purchase and maintain. Kenneth N. Vanek, Ph.D. Associate Chairman Department of Radiation Oncology Medical University of South Carolina 169 Ashley Avenue P.O. Box 250318 Charleston, S.C. 29425-0721 Email: vanek@radonc.musc.edu Office: 843-792-3273 FAX: 843-792-5498 ---------------------------------------------------------------------------- -------------------------- "Only by opening our mind to the possibility that we are not seeing everything will we be able to see what we are missing." Steven Covey 1997 calendar ---------------------------------------------------------------------------- -------------------------- > -----Original Message----- > From: Nelson, Steve > Sent: Tuesday, November 30, 1999 8:21 AM > To: Vanek, Kenneth > Subject: FW: lasers, corrected > > FYI > > -----Original Message----- > From: Barnes, Bill [SMTP:B_Barnes@FCCC.EDU] > Sent: Friday, November 26, 1999 9:01 AM > To: 'John Somers' > Cc: Linac-Eng (E-mail) > Subject: RE: lasers, corrected > > Hello John, > > We installed the Scanditronix Emerald lasers(15 of them)(Green), they are > a > diode laser with sub millimeter line thickness. We looked at all > available > lasers and chose the Emeralds over everyone else because of the clarity, > projected line length,thickness and visibility. I would highly recommend > them. The green laser is great because it is VERY VISIBLE in all > situations > > > BILL BARNES > BIO ENGINEER > FOX CHASE CANCER CENTER PHILADELPHIA > 215-728-2997 > > > > -----Original Message----- > From: John Somers [mailto:somers@radonc17.ucsf.edu] > Sent: Thursday, November 25, 1999 12:21 AM > To: linac-eng@plato1.aristotle.net > Subject: Fwd: lasers, corrected > > > Somehow I seem to have deleted the word "diode" from my original message. > As some people figured out, that's what I was trying to ask about. So > here > it is corrected. > > > >Good day to all, > > We are fitting up a new facility with 3 new linac rooms. Does > anyone have > >experience with using wall-mounted DIODE lasers instead of the plasma > tube > >lasers? I'm wondering if they might give better long-term reliability? > > Thanks for any info. > > > > John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: employment opportunities Message-ID: <000501bf419e$8a46d7c0$d252dbab@pwserver> From: Steve Schwarz To: linac-eng@plato1.aristotle.net Subject: employment opportunities Date: Wed, 8 Dec 1999 09:05:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" **************EMPLOYMENT OPPORTUNITIES!************************** Acceletronics, the leading independent service company specializing in Radiation Therapy equipment has immediate openings for experienced Field Service Engineers and Product Specialists. We are looking for professional, self motivated, customer satisfaction oriented individuals with factory and/or in-house/field training and experience. At Acceletronics, we've earned the respect of the Radiotherapy community by fielding the most dedicated, innovative and technically competent Field Service Engineers in the industry. Come help us continue our record of success by joining us as a Field Service Engineer or Product Specialist in one of the the following areas: East Coast, Mid-Atlantic and North-Eastern U.S. North Central and Mid-Central U.S. Upper Mid-West and Central Mid-Western U.S. Other areas of the U.S. will be considered. Personnel in these key positions will interface directly with therapists, doctors and physicists, requiring proven customer relations and troubleshooting skills. Military electronics training or an electronics degree is required, supplemented by at least 2 years of experience with Radiation therapy equipment. Field experience with GE, Siemens or Picker CT Scanners, networking and/or diagnostic radiology equipment a big plus. Acceletronics offers an excellent salary and benefits package that includes a very generous salary and vacation plan, company provided medical, dental, life and disability insurances, a top notch 401K plan with company contributions, profit sharing and bonus plan, an excellent sales incentive program and company provided vehicles. We believe we are offering the finest compensation package available and the opportunity to work with the finest team in the industry. This is a ground floor opportunity to utilize your skills to the fullest and advance within a rapidly growing organization. The potential for your personal & professional growth is huge. All applicant information will be held in the strictest confidence. Please fax your resume to (847)-735-0087 or reply by email to resume@acceletronics.com. You may also send your resume to: Acceletronics, 37 Sherwood Terrace, Suite 124, Lake Bluff, IL, 60044 Attn: Steve Schwarz, president Acceletronics is an equal opportunity employer. Hope you all have a happy & healthy holiday season and we look forward to hearing from you! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Clinac 6/100 Yield faults Message-ID: <85256841.004F06C1.00@mail.lrcc.on.ca> From: Bob.Tonks@lrcc.on.ca To: David Horsman , linac-eng@plato1.aristotle.net Subject: Re: Clinac 6/100 Yield faults Date: Wed, 8 Dec 1999 06:23:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi David, Your machine is probably running at the heat limit of the magnatron. They cannot run at 115 amps for long and as the maggie heats up the RF output falls off so the yield servo ups the current which just makes things worse. How old is the maggie? Can you run at lower rep rate? You may have a problem with the dose per pulse output from the accelerator tube. These units have a fine balance between gun current and RF. If you can increase the gun HV pulse voltage you may be able to decrease your rep rate or your magnet might have low guass which will cause high MAGI but low gun pulse high voltage. If the magnatron magnet is low you effectively have low impedance at the magnatron so the supply voltage is reduced which causes lower gun high voltage which causes low dose per pulse. All this is required to maintain the Clinical energy your machine was setup to run at. Let me know what you have come up with so far. Bob Tonks London Regional Cancer Centre Hello all, I'm after some worldly advice on a Clinac 6/100 that is giving Yield faults. Just after Beam On, the Yield servo is operating at minimum. (As shown by LEDs on the Yield Servo PCB.) The mag current is about 105 amps at this time. Occasionally a Yield fault is produced. If the machine does not give a Yield fault at this stage, the Yield servo slowly increases the mag current until the servo is operating at maximum (as indicated by the LEDs on the Yield servo PCB). The mag current is about 115 amps at this time. The machine often gives Yield faults after the Yield servo reaches maximum. If you Beam Off, then Beam On immediately, or soon after, the Yield servo operates at or near maximum straight away, so it appears that my problem is temperature related. AFC has been checked and operates properly. With the Yield servo off, forward power does not change noticeably with time, so the magnetron is okay. The accelerator waveguide has been suspected, so the gun filament voltage was increased from 6.83 to 7.6 volts with no noticeable change in the operation of the machine. (I didn't check the Step 1 voltage directly. I only wanted to observe the effect of increasing the gun filament voltage.) Should I still be suspicious of the waveguide? Are there any other tests I can perform to verify it's status? What am I missing? Any (helpful) suggestions would be greatly appreciated. David Horsman Medical Physics Royal Adelaide Hospital Ph +61 8 8222 4188 Fx +61 8 8222 5937 dhorsman@cancer.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Clinac 6/100 Yield faults Message-ID: <384E5FE2.2DAF8ED3@wfubmc.edu> From: tcullen@wfubmc.edu To: David Horsman Cc: linac-eng@plato1.aristotle.net Subject: Re: Clinac 6/100 Yield faults Date: Wed, 8 Dec 1999 05:40:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" David, to get a good understanding of the operation of the yield servo pcb and to help you TS this problem, look in the systems diagrams in the data book or look at the block diagram in the systems manual, both are well laid out and will help you. You did not mention what your DQing was doing during this. David Horsman wrote: > Hello all, > > I'm after some worldly advice on a Clinac 6/100 that is giving Yield > faults. > > Just after Beam On, the Yield servo is operating at minimum. (As > shown by LEDs on the Yield Servo PCB.) The mag current is about > 105 amps at this time. Occasionally a Yield fault is produced. If the > machine does not give a Yield fault at this stage, the Yield servo > slowly increases the mag current until the servo is operating at > maximum (as indicated by the LEDs on the Yield servo PCB). The > mag current is about 115 amps at this time. The machine often > gives Yield faults after the Yield servo reaches maximum. > > If you Beam Off, then Beam On immediately, or soon after, the > Yield servo operates at or near maximum straight away, so it > appears that my problem is temperature related. > > AFC has been checked and operates properly. With the Yield > servo off, forward power does not change noticeably with time, so > the magnetron is okay. The accelerator waveguide has been > suspected, so the gun filament voltage was increased from 6.83 to > 7.6 volts with no noticeable change in the operation of the machine. > (I didn't check the Step 1 voltage directly. I only wanted to observe > the effect of increasing the gun filament voltage.) > > Should I still be suspicious of the waveguide? Are there any other > tests I can perform to verify it's status? What am I missing? Any > (helpful) suggestions would be greatly appreciated. > > > David Horsman > Medical Physics > Royal Adelaide Hospital > Ph +61 8 8222 4188 > Fx +61 8 8222 5937 > > dhorsman@cancer.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: MLC Debate Message-ID: <384E57FF.9F264AF4@hsc.vcu.edu> From: Chris Bartee To: "." , linac-eng Subject: Re: MLC Debate Date: Wed, 8 Dec 1999 05:07:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Very well said, Chris Bartee "." wrote: > Hi all, > > I have watched the debate on MLC's with interest but now feel I must add my > comments. > > It should be universally accepted that the MLC, whatever manufacturer makes > it, is a complicated device. The mechanics of such a device are complicated > enough without taking into account all of the control software and allied > systems. > > I believe that none of the manufacturers deliberately release onto the > market a product that is unreliable and more of a hindrance than help. It > would only damage their reputation and ultimately, sales. Every product goes > through incremental design improvements during its life cycle, so the > performance of your MLC will depend on what evolution you have bought. If > you are unfortunate enough to have a 'rogue' one, and lets face it, we have > all got a piece of equipment somewhere that doesn't do exactly what it > should or has its' own quirks, take comfort in the knowledge that somewhere > there is someone struggling to fix an older, less developed version (usually > me!). You don't have to be Einstein to realise that the more complicated a > device, the greater possibility of it breaking down or misbehaving. > >From the messages I have read, it appears as though the manufacturers are > happy to assist in faults and supply components. What else could you hope > for? Every device will ultimately fail at some time, that's why we are here! > As long as the manufacturers continue to offer support and parts, what's the > problem? > > What concerns me is the apparent degeneration of the debate into a 'you said > this and then I said that' affair which I have witnessed on many a digest > before, and unsubscribed because of it. Lets return this digest to the forum > of colleagues sharing information and helping each other. After all, isn't > that the more constructive than arguing over things we have little control > over? The vast majority of us are employed to use our knowledge and > experience to fix machine faults. Surely we shouldn't be upset when they do > break? > > Regards > > Sean Murphy > Senior MTO > RSH Hospital > Southampton > Tel. (+44) 02380 825393 > Fax. (+44) 02380 825650 > UK > > ___________________________________________________________ > Disclaimer - > > The information and views expressed in this text are those of the author > alone and should in no way be taken to express those of the Department > or Trust management. > ___________________________________________________________ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: job posting Message-ID: <01BF4155.120C8820.jmaddox@jcrt.harvard.edu> From: Jerry Maddox To: "'linac-eng@plato.aristotle.net'" Subject: job posting Date: Wed, 8 Dec 1999 05:20:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" There is a position available at Caregroup in Boston. They have a contract with Accelinear, but still want someone for first response, everything else, etc. Send email to holupka@jcrt.harvard.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: SL Target Check Pot Assy Message-ID: <53D52477D1F@medfys.aau.dk> From: Lars Nielsen To: chrisf@ulth.northy.nhs.uk Cc: linac-eng@plato1.aristotle.net Subject: Re: SL Target Check Pot Assy Date: Wed, 8 Dec 1999 05:18:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hey Chris Here at our department we have replaced the spring 2 times, on a SL15 installed in 1990. On SL25 installed in 1991 the spring has never been replaced (yet) It is my idea that you have to take great care when replacing this spring not to damage the eye of the spring by using force instead of dismounting the nuts on the frame side. The last spring was broken at the eye of the spring mounted to the frame. Lars Nielsen Aarhus University Hospital Department of Medical Physis Noerrebrogade 44 8000 Aarhus C Denmark E-mail: Lars@medfysik.aau.dk Phone: (+045) 89492497 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: MLC Debate Message-ID: From: STEVEN COLLIGAN To: linac-eng@plato1.aristotle.net Subject: MLC Debate Date: Wed, 8 Dec 1999 02:58:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ---------------snipped--------------------------------- If the machines didn't break we wouldn't have a job. ---------------snipped--------------------------------- As long as the manufacturers continue to offer support and parts, what's the problem? ---------------snipped--------------------------------- If the hospital were to buy a machine which could be broken permanently, and the suppliers continued to offer support and parts, we'd all be happy. Or would we ? The purpose of the machine is to treat patients, and while it is being repaired, it is not doing this. Yes, we have to accept down-time, and the more complex the machine, the more down-time we have to expect. Also, if a hospital is involved in the beta testing of equipment, then the patient workload and staffing must be structured to cope with the possible problems. However, by the time the equipment is released onto the general marketplace, the customer has a right to expect a reasonable MTBF. Manufacturers spend vast sums of money on development, and must recoup this cash through sales. However, the product must be ready for use in a busy clinical environment before it is released. This may or may not be the case with the recent MLC debate, but I suspect that ALL manufacturers are guilty to a certain extent of releasing products too early. Support and spares certainly help, but low down-time and maximum availability for patient treatment are what really matter. The information and views expressed are those of the author and should not be taken to express those of the Hospital Trust or Management Steve Colligan Senior Physicist Radiotherapy Department Raigmore Hospital Old Perth Road Inverness Scotland, UK Phone +44 (0) 1463 704440 Fax +44 (0) 1463 704430 Email scoll01@raigmore.scot.nhs.uk ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Clinac 6/100 Yield faults Message-ID: <0.ee49eba5.257f5a58@aol.com> From: Accelinear@aol.com To: Dhorsman@mail.rah.sa.gov.au, linac-eng@plato1.aristotle.net Subject: Re: Clinac 6/100 Yield faults Date: Tue, 7 Dec 1999 22:53:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For all our non-Varian experienced friends out there let me clear up the term "yield fault". Varian uses the term to identify the xray yield from a given quantity of electrons. It is derived by comparing the beam (target) current to the charge captured by the ion chamber. For a constant beam energy the theory states that the ratio of the ion chamber current to the beam current will be constant. Varian uses this method in place of a bending magnet to insure constant and calibrated beam energy. Therefore when one is troubleshooting a yield fault problem one must first determine which of the two signals is changing (or maybe both). In a properly operating system within 3 seconds of beaming on both the ion chamber current and the beam current should have reached stable operating points. My question at this point to the author of the original question is, which is changing? Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Clinac 6/100 Yield faults Message-ID: <9912080451.AA03908@yoyo.rah.sa.gov.au> From: David Horsman To: linac-eng@plato1.aristotle.net Subject: Clinac 6/100 Yield faults Date: Tue, 7 Dec 1999 20:31:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, I'm after some worldly advice on a Clinac 6/100 that is giving Yield faults. Just after Beam On, the Yield servo is operating at minimum. (As shown by LEDs on the Yield Servo PCB.) The mag current is about 105 amps at this time. Occasionally a Yield fault is produced. If the machine does not give a Yield fault at this stage, the Yield servo slowly increases the mag current until the servo is operating at maximum (as indicated by the LEDs on the Yield servo PCB). The mag current is about 115 amps at this time. The machine often gives Yield faults after the Yield servo reaches maximum. If you Beam Off, then Beam On immediately, or soon after, the Yield servo operates at or near maximum straight away, so it appears that my problem is temperature related. AFC has been checked and operates properly. With the Yield servo off, forward power does not change noticeably with time, so the magnetron is okay. The accelerator waveguide has been suspected, so the gun filament voltage was increased from 6.83 to 7.6 volts with no noticeable change in the operation of the machine. (I didn't check the Step 1 voltage directly. I only wanted to observe the effect of increasing the gun filament voltage.) Should I still be suspicious of the waveguide? Are there any other tests I can perform to verify it's status? What am I missing? Any (helpful) suggestions would be greatly appreciated. David Horsman Medical Physics Royal Adelaide Hospital Ph +61 8 8222 4188 Fx +61 8 8222 5937 dhorsman@cancer.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: PO 9991261 Nellcor Message-ID: <3F7128BCAC04D211838F00805FA76DE401921322@PHSORMSG02> From: "DelaRosa, Ella" To: "Menken, Dean" Cc: "Pieren, Doug" , "McMahan, Robert" , "Wilson, Jim" Subject: RE: PO 9991261 Nellcor Date: Tue, 7 Dec 1999 16:08:07 -0800 Importance: high X-Priority: 1 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dean - This problem has been fixed. Got all info I needed to receive. I did check with Duane, and he didn't have the equipment card but I gave him s/n and equipment control card numbers. Thanks. Ella > -----Original Message----- > From: Menken, Dean > Sent: Tuesday, December 07, 1999 12:03 PM > To: DelaRosa, Ella > Cc: Pieren, Doug; McMahan, Robert; Wilson, Jim > Subject: RE: PO 9991261 Nellcor > > Ella, > I'm sure you've already contacted Duane Dick to see if this is complete. > Anytime capital equipment is checked in, we send the Equipment Control > Card to Duane for proper tracking. > > Also, have we received serial number info from vendor. We could assist in > tracking though our database via this method. > > Dean > > -----Original Message----- > From: Rutstein, Faye > Sent: Tuesday, December 07, 1999 8:22 AM > To: McMahan, Robert; DelaRosa, Ella; Wilson, Jim > Cc: Pieren, Doug > Subject: RE: PO 9991261 Nellcor > > > 12-7 Company calling again and I don't have an answer yet. It this > PO going to be paid if not what do I tell Johene at Nellcor > 1-800-664-8786 ex 46495. > Faye Rutstein > PHS Regional Accounting > > -----Original Message----- > From: McMahan, Robert > Sent: Friday, November 19, 1999 6:40 AM > To: DelaRosa, Ella; Wilson, Jim > Cc: Rutstein, Faye > Subject: RE: PO 9991261 Nellcor > > Ella, > If the device came here, I would have sent it to SV Biomed. > I have no paperwork or anything here. I might suggest that you ask Nellcor > for the serial # of the unit they shipped on this po#, that way if Jim W. > can't track it we might be able to search our database for that s/n and > find it that way. > Thanks > BobM. > > -----Original Message----- > From: DelaRosa, Ella > Sent: Thursday, November 18, 1999 3:23 PM > To: McMahan, Robert; Wilson, Jim > Cc: Rutstein, Faye > Subject: FW: PO 9991261 Nellcor > Importance: High > > Bob/Jim - > > I need your help again. Back in July, it was > unclear to me who services PMG Sunnyside. I now know it's STV. However, > the above P.O. indicated ship to PPMC Biomed. If this was inspected and > tagged in either PPMC or PSTV Biomed, can either of you let me know if > the inspection was completed and product delivered to the clinic? The > company's invoice is dated July. Thanks again. > > Ella > > -----Original Message----- > From: Rutstein, Faye > Sent: Thursday, November 18, 1999 1:23 PM > To: DelaRosa, Ella > Subject: PO 9991261 Nellcor > > Company calling for payment it is a July invoice. > Can we pay it. thanks > > Faye Rutstein > PHS Regional Accounting > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 120 mlc Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D821@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Jerry Maddox' , "'linac-eng@plato.aristotle.net'" Subject: RE: 120 mlc Date: Tue, 7 Dec 1999 10:19:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I second the motion on personal opinions. As to no Mdiag, this is true. There is NTDiag, but it still needs some work. You access the controller directly through a serial link (at present). The command set in mlcx.out is excellent when it comes to giving you information about what is going on inside. Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Jerry Maddox [mailto:jmaddox@jcrt.harvard.edu] Sent: Tuesday, December 07, 1999 9:16 AM To: 'linac-eng@plato.aristotle.net' Subject: 120 mlc Appreciate hearing evreyone's experience on new MLCs, 80 or 120. How do you go about repairing them? No Mdiag, I hear. Would appreciate it if personal issues were not part of this forum, enough stress already! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: MLC Debate Message-ID: <002001bf40d6$ab80fec0$f556ac3e@default> From: "." Reply-To: "." To: linac digest Subject: MLC Debate Date: Tue, 7 Dec 1999 09:14:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, I have watched the debate on MLC's with interest but now feel I must add my comments. It should be universally accepted that the MLC, whatever manufacturer makes it, is a complicated device. The mechanics of such a device are complicated enough without taking into account all of the control software and allied systems. I believe that none of the manufacturers deliberately release onto the market a product that is unreliable and more of a hindrance than help. It would only damage their reputation and ultimately, sales. Every product goes through incremental design improvements during its life cycle, so the performance of your MLC will depend on what evolution you have bought. If you are unfortunate enough to have a 'rogue' one, and lets face it, we have all got a piece of equipment somewhere that doesn't do exactly what it should or has its' own quirks, take comfort in the knowledge that somewhere there is someone struggling to fix an older, less developed version (usually me!). You don't have to be Einstein to realise that the more complicated a device, the greater possibility of it breaking down or misbehaving. >From the messages I have read, it appears as though the manufacturers are happy to assist in faults and supply components. What else could you hope for? Every device will ultimately fail at some time, that's why we are here! As long as the manufacturers continue to offer support and parts, what's the problem? What concerns me is the apparent degeneration of the debate into a 'you said this and then I said that' affair which I have witnessed on many a digest before, and unsubscribed because of it. Lets return this digest to the forum of colleagues sharing information and helping each other. After all, isn't that the more constructive than arguing over things we have little control over? The vast majority of us are employed to use our knowledge and experience to fix machine faults. Surely we shouldn't be upset when they do break? Regards Sean Murphy Senior MTO RSH Hospital Southampton Tel. (+44) 02380 825393 Fax. (+44) 02380 825650 UK ___________________________________________________________ Disclaimer - The information and views expressed in this text are those of the author alone and should in no way be taken to express those of the Department or Trust management. ___________________________________________________________ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 120 mlc Message-ID: <01BF409C.16E140C0.jmaddox@jcrt.harvard.edu> From: Jerry Maddox To: "'linac-eng@plato.aristotle.net'" Subject: 120 mlc Date: Tue, 7 Dec 1999 07:16:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Appreciate hearing evreyone's experience on new MLCs, 80 or 120. How do you go about repairing them? No Mdiag, I hear. Would appreciate it if personal issues were not part of this forum, enough stress already! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: SL Target Check Pot Assy Message-ID: <85256840.00466BAF.00@atlantaone.eos.elekta.com> From: Winston.Swaby@elekta.com To: Chris FORREST , Andy.G.Scott@elekta.com Cc: linac-eng@plato1.aristotle.net, David.Paton@elekta.com, Jo.Subedar@elekta.com Subject: Re: SL Target Check Pot Assy Date: Tue, 7 Dec 1999 04:47:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Chris, I would like to comfort you in saying that the failure of the spring from the target check pot assy is an unusal occurrence. I am glad to say we do not get many reports of this kind of failure. In the meantime we have despatched a couple of springs to your site FOC. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Total Body Irraddiation. Message-ID: <000701bf4099$17cabdc0$LocalHost@instant> From: Rene Agbayani To: linac-eng@plato1.aristotle.net Subject: Total Body Irraddiation. Date: Tue, 7 Dec 1999 01:54:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to you guys, We are having a big debate about the requirement for Total Body Irridiation bunker design. Can you please help us here?? We are going to house a Clinac 600C/D machine in a room having 3.06 m on one side and 2.9 m on the other side of the wall. According to Varian, the 3.06m length is sufficent for TBI. The physicist here insist of approximately 5.0 distance from the isocenter to the wall. I have never seen a patient being treated with TBI. What does really matters about treating with TBI. What can be done if you have a limited space of 3.0m?? What can be the minimum distance needed for TBI patients?? Can you please advice. Thanks, Rene Agbayani Medical Physics Engineer MED-MOH Bahrain ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: New Millennium working so well Message-ID: <0.1e44eec4.257df0d8@aol.com> From: Smeliin@aol.com To: clbartee@hsc.vcu.edu, RKimball@radonc-uc-po.mcis.uchicago.edu, linac-eng@plato1.aristotle.net Subject: Re: New Millennium working so well Date: Mon, 6 Dec 1999 21:10:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hey Chris--I'm glad your such a loyal Varian past employee but my job is to protect my employer by not giving tons of money to Varian. If they want happy customers--then work with us-not against us. The feedback you refer to is a two way street; when you worked for Varian I asked a simple question and got nothing from you except a hard time;; If you want to kiss Varian's behind take it somewhere else. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 120 leaf MLC Message-ID: <384C17EF.7810F4E2@wfubmc.edu> From: tcullen@wfubmc.edu To: Chris Bartee , "Linac Engineers (E-mail)" Subject: Re: 120 leaf MLC Date: Mon, 6 Dec 1999 12:09:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, I can remember you coming to this facility as a field service rep, not so long ago, having very little knowledge of the item you were about "service," which happened to be a 80 under warranty. But by now I'm sure you have both the 80 and 120 mastered. If you read my post closely I don't believe I "hammered" the 120 at all, I merely made comment on the operation of the 80 and what appears to be similarities with the 120. I thought I actually slipped in a kudos line for the fellows in Milpitas but I guess it was too subtle. You say the two MLC's are different. I don't see it. From what's being said here, including from you, both seem to have operational problems out of the box. Chris Bartee wrote: > I rest my case. Tim you should have some knowledge of the equipment > before you hammer it. > The Mk2 and 120 are very different, The motors in question are half > leaf, smaller, and the control software is totally different. > > Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 120 leaf MLC Message-ID: <384C0C28.B76ED2FF@hsc.vcu.edu> From: Chris Bartee To: Tim Cullen , linac-eng Subject: Re: 120 leaf MLC Date: Mon, 6 Dec 1999 11:19:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I rest my case. Tim you should have some knowledge of the equipment before you hammer it. The Mk2 and 120 are very different, The motors in question are half leaf, smaller, and the control software is totally different. Chris Bartee Tim Cullen wrote: > ----------------snipped--------------------------------- > > > If the machines didn't break we wouldn't have a job. > > ----------------snipped----------------------------------- > > Chris C.and Chris B., > > I'd like to add to this: On the other hand, if they break too much we might > not have a job either. > > I have also always powered down the 80 leaf PCs, but on the occasional "left > on" nights and weekends, there have never been motor failures. > The "groans", in most cases are warranted, at least the people doing the > groaning believe so. You can cull through the "groans" to make decisions on > products, not just on this listserver, but others. I think the original thread > on the 120 leaf MLC was fishing for info. If it was received in the "groan" > format or in the "at-a-boy" format, I don't think I would care, as long as I > got the pro-con info I was looking for. > > If you feel like the motor problem was solved by powering down the controller > then good...... > > IMHO this forum is not to be taken as the linac gospel. > > Chris.Coyle@mail.swedish.org wrote: > > > First, thanks for the responses on the problems THAT MAY be present in the > > 120 leaf MLC. > > > > I have always suggested that the MLC controller be shut down after > > treatment usage each day. > > This was true with the 52 and 80 leaf versions. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: MD-2 Baseframe Message-ID: <6CE096D0CDF4D211A3110008C75D07523603C5@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: MD-2 Baseframe Date: Mon, 6 Dec 1999 10:38:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To All, We have a Siemens MD-2 baseframe available if anyone is interested. This baseframe is 3 years old and has been removed from the concrete in very good condition. It is my understanding that this baseframe can be adapted for use on a new Primus machine with the addition of the 5th pad. If anyone is interested please contact me at: 520-694-7404 Just a comment here about all the talk on MLC's. As far as I am concerned MLC stands for More or Less Crap no matter who makes them. Remember, the people that design them and rush them to market never have to work on them in the field. This is a personal comment only and does not reflect my employers position. Dan Watters Radiology Engineer University Medical Center Tucson, AZ. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 120 leaf MLC Message-ID: <384BF38A.8E644C49@wfubmc.edu> From: tcullen@wfubmc.edu To: Chris.Coyle@mail.swedish.org Cc: linac-eng@plato1.aristotle.net Subject: Re: 120 leaf MLC Date: Mon, 6 Dec 1999 09:34:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ----------------snipped--------------------------------- > If the machines didn't break we wouldn't have a job. ----------------snipped----------------------------------- Chris C.and Chris B., I'd like to add to this: On the other hand, if they break too much we might not have a job either. I have also always powered down the 80 leaf PCs, but on the occasional "left on" nights and weekends, there have never been motor failures. The "groans", in most cases are warranted, at least the people doing the groaning believe so. You can cull through the "groans" to make decisions on products, not just on this listserver, but others. I think the original thread on the 120 leaf MLC was fishing for info. If it was received in the "groan" format or in the "at-a-boy" format, I don't think I would care, as long as I got the pro-con info I was looking for. If you feel like the motor problem was solved by powering down the controller then good...... IMHO this forum is not to be taken as the linac gospel. Chris.Coyle@mail.swedish.org wrote: > First, thanks for the responses on the problems THAT MAY be present in the > 120 leaf MLC. > > I have always suggested that the MLC controller be shut down after > treatment usage each day. > This was true with the 52 and 80 leaf versions. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian Christmas Bonus Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D81D@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'Hidalgo, Oscar'" , 'Chris Bartee' , linac-eng Subject: RE: Varian Christmas Bonus Date: Mon, 6 Dec 1999 09:31:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Well....okay...there you have it! Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Hidalgo, Oscar [mailto:OSCARH@MARYBIRD.COM] Sent: Monday, December 06, 1999 10:01 AM To: 'Chris Bartee'; linac-eng Subject: RE: (no subject) We had the same experience at the beginning with our 120 MLC. Varian took care of the problem promptly. Changed a couple of motors and the problem hasn't showed up again. We now turn off the controller at night. I think the Varian service is excellent and I wouldn't hesitate to recommend it to any one. Oscar Hidalgo Mary Bird Perkins Cancer Center BM__MailData-----Original Message----- From: Chris Bartee [SMTP:clbartee@hsc.vcu.edu] Sent: Monday, December 06, 1999 8:42 AM To: linac-eng Subject: (no subject) Ok everyone, I recently had an MLC 120 installed with a new machine. We lost motors (half Leave) in the beginning, about 1 every 2 days. Varian now recommends to shut the controller down at night. Since we started doing that, we have not lost any motors. And Varian has been very cooperative in the problem solving of all the minor problems. I also thought this was a constructive site used for the exchange of ideas and problem solving. I don't respond to most e-mail because this to me is a groaning brd about vendors. If the machines didn't break we wouldn't have a job. As for a few people, if you didn't try to antagonize and work with the vendors you wouldn't have any problems. I think you should check yourself before slamming others. Thats' all I'll say, Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: New Millennium working so well Message-ID: <384BEB6D.355ACDF@hsc.vcu.edu> From: Chris Bartee To: Richard Kimball , linac-eng Subject: Re: New Millennium working so well Date: Mon, 6 Dec 1999 08:59:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Look I will not play these games. Like I said, my job is to repair it and to provide constructive feedback to the vendor. My job is not to re-design it. And yes I do know about the Millennium and the software. My conduit is clear. Chris Bartee, Research Associate Medical College of Virginia/ VCU 804.225.3260 Richard Kimball wrote: > Chris, > We are happy to hear that your new equipment is working so well....but > please....where does this message come from? > > The Millennium series MLC is a really great design...really! But, there ARE > problems. Many more than you realize right now (but will :)). Ask yourself > this question, "Why do we have to shut down the MLC controller every night?" > Is it because the software still needs extensive work? Hmmmm....maybe. > > And by the way....there is no official conduit of information for keeping up > on the Millennium software or hardware. We just installed the -19 release > to the controller. Do you have this same rev level? If you said yes....I > would be surprised. > > Richard L. Kimball > Chief Clinical Engineer > Department of Radiation & Cellular Oncology > The University of Chicago Medical Center > 773.702.6879 > > -----Original Message----- > From: Chris Bartee [mailto:clbartee@hsc.vcu.edu] > Sent: Monday, December 06, 1999 8:42 AM > To: linac-eng > Subject: (no subject) > > Ok everyone, I recently had an MLC 120 installed with a new > machine. We lost motors (half Leave) in the beginning, about 1 every 2 > days. Varian now recommends to shut the controller down at night. Since > we started doing that, we have not lost any motors. And Varian has been > very cooperative in the problem solving of all the minor problems. > I also thought this was a constructive site used for the > exchange of ideas and problem solving. I don't respond to most e-mail > because this to me is a groaning brd about vendors. If the machines > didn't break we wouldn't have a job. As for a few people, if you didn't > try to antagonize and work with the vendors you wouldn't have any > problems. I think you should check yourself before slamming others. > > Thats' all I'll say, > > Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 120 leaf MLC Message-ID: <8825683F.005E7FA5.00@ntip01.swedish.org> From: Chris.Coyle@mail.swedish.org To: linac-eng@plato1.aristotle.net Subject: 120 leaf MLC Date: Mon, 6 Dec 1999 09:09:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" First, thanks for the responses on the problems THAT MAY be present in the 120 leaf MLC. I have always suggested that the MLC controller be shut down after treatment usage each day. This was true with the 52 and 80 leaf versions. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: New Millennium working so well Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D81B@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Chris Bartee' , linac-eng Subject: RE: New Millennium working so well Date: Mon, 6 Dec 1999 08:03:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, We are happy to hear that your new equipment is working so well....but please....where does this message come from? The Millennium series MLC is a really great design...really! But, there ARE problems. Many more than you realize right now (but will :)). Ask yourself this question, "Why do we have to shut down the MLC controller every night?" Is it because the software still needs extensive work? Hmmmm....maybe. And by the way....there is no official conduit of information for keeping up on the Millennium software or hardware. We just installed the -19 release to the controller. Do you have this same rev level? If you said yes....I would be surprised. Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Chris Bartee [mailto:clbartee@hsc.vcu.edu] Sent: Monday, December 06, 1999 8:42 AM To: linac-eng Subject: (no subject) Ok everyone, I recently had an MLC 120 installed with a new machine. We lost motors (half Leave) in the beginning, about 1 every 2 days. Varian now recommends to shut the controller down at night. Since we started doing that, we have not lost any motors. And Varian has been very cooperative in the problem solving of all the minor problems. I also thought this was a constructive site used for the exchange of ideas and problem solving. I don't respond to most e-mail because this to me is a groaning brd about vendors. If the machines didn't break we wouldn't have a job. As for a few people, if you didn't try to antagonize and work with the vendors you wouldn't have any problems. I think you should check yourself before slamming others. Thats' all I'll say, Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: (no subject) Message-ID: From: "Hidalgo, Oscar" To: 'Chris Bartee' , linac-eng Subject: RE: (no subject) Date: Mon, 6 Dec 1999 08:00:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had the same experience at the beginning with our 120 MLC. Varian took care of the problem promptly. Changed a couple of motors and the problem hasn't showed up again. We now turn off the controller at night. I think the Varian service is excellent and I wouldn't hesitate to recommend it to any one. Oscar Hidalgo Mary Bird Perkins Cancer Center BM__MailData-----Original Message----- From: Chris Bartee [SMTP:clbartee@hsc.vcu.edu] Sent: Monday, December 06, 1999 8:42 AM To: linac-eng Subject: (no subject) Ok everyone, I recently had an MLC 120 installed with a new machine. We lost motors (half Leave) in the beginning, about 1 every 2 days. Varian now recommends to shut the controller down at night. Since we started doing that, we have not lost any motors. And Varian has been very cooperative in the problem solving of all the minor problems. I also thought this was a constructive site used for the exchange of ideas and problem solving. I don't respond to most e-mail because this to me is a groaning brd about vendors. If the machines didn't break we wouldn't have a job. As for a few people, if you didn't try to antagonize and work with the vendors you wouldn't have any problems. I think you should check yourself before slamming others. Thats' all I'll say, Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: (no subject) Message-ID: <384BCB2F.C0A074C0@hsc.vcu.edu> From: Chris Bartee To: linac-eng Subject: (no subject) Date: Mon, 6 Dec 1999 06:41:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ok everyone, I recently had an MLC 120 installed with a new machine. We lost motors (half Leave) in the beginning, about 1 every 2 days. Varian now recommends to shut the controller down at night. Since we started doing that, we have not lost any motors. And Varian has been very cooperative in the problem solving of all the minor problems. I also thought this was a constructive site used for the exchange of ideas and problem solving. I don't respond to most e-mail because this to me is a groaning brd about vendors. If the machines didn't break we wouldn't have a job. As for a few people, if you didn't try to antagonize and work with the vendors you wouldn't have any problems. I think you should check yourself before slamming others. Thats' all I'll say, Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re: brachytherapy sources Message-ID: <0.72df356c.257d01c9@aol.com> From: WesPres@aol.com To: linac-eng@plato1.aristotle.net Subject: re: brachytherapy sources Date: Mon, 6 Dec 1999 04:10:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks for the input from everyone. Not knowing a lot about the subject, your input regarding the safety of non Nucletron sources was greatly appreciated. It makes the decision to stick with Nucletron for now pretty easy. Wes Preston Sr. Imaging Engineer Northside Hospital Atlanta, Georgia wespres@aol.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: brachytherapy sources Message-ID: <0.784c5790.257c90ec@aol.com> From: WesPres@aol.com To: linac-eng@plato1.aristotle.net Subject: brachytherapy sources Date: Sun, 5 Dec 1999 20:09:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Could anyone give me the name and contact information of a few places that Iridium-192 sources could be acquired. We have a Nucletron HDR Afterloader and I would like to be able to compare prices from different suppliers if their is more than one. We have received the prices from Nucletron, but I don't know how competitive they are. Thanks in advance, Wes Preston Sr. Imaging Engineer Northside Hospital Atlanta, Georgia wespres@aol.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian 120 leaf MLC Message-ID: <3848610A.A717BDBF@wfubmc.edu> From: tcullen@wfubmc.edu To: "Barnes, Bill" Cc: "'David Bisciotti, MSc'" , "Linac-Eng (E-mail)" Subject: Re: Varian 120 leaf MLC Date: Fri, 3 Dec 1999 16:32:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Bill, you don't have to shout. We all know they care. "Going through motors like crazy"...... but you see, they have supplied him with more than enough motors to replace the ones that fail regularly. Now that is what I call caring. Don't that just make you all warm and fuzzy inside. Makes you want to hug your local field/sales rep the next time he/she comes in for that casual drop-in visit to see how those million dollar units they sold you are doing. Wait a minute.... I'm sorry I got the old company mixed up with the new company....my mistake....sorry. I stayed here till midnight and again here late...little punchy....seems to be a trend.... All I can say is if there are problems with the MLC product I know they will work them out over a period of time, if the guys in Milpitas have anything to do with it. We have a 80 leaf which was very troublesome for the first year +, but now gives very little trouble. There was some damage done to the effort to convince the physicians here to give it a chance. Not only were they leery about the "jagged edges" but the up-time became a real issue. It sounds as if they have worked on the jagged edge problem by adding more leaves but not the general operation problems. Of course another way to look at it, is....more leaves...more problems. Y'all have one on me while I sit here and wait for this SW to load. Things like this only occur on Fridays.... "Barnes, Bill" wrote: > HERE IS VARIAN'S CHANCE TO SHOW THEY CARE... > > DO THEY WANT TO CONTRIBUTE TO OUR LIST IN A CONSTRUCTIVE WAY OR NOT... > > BILL BARNES > > -----Original Message----- > From: David Bisciotti, MSc [mailto:daveb@nshs.edu] > Sent: Friday, December 03, 1999 4:10 PM > To: 'Chris.Coyle@mail.swedish.org'; Linac Engineers (E-mail) > Subject: RE: Varian 120 leaf MLC > > We have been going thru motors like crazy.......They fail during > initialization. > > We have also noticed that failures follow whenever the machine crashes > overnight and is "cold" in the morning (Could be contraction of the leaves > - increased friction?) > > In the last two months we have replaced no less than 12 motors....(10% > failure rate...hmm...) > > On the positive side, replacing the motors is very simple, and fast (about > 10 minutes) - Varian has been very supportive by keeping a good supply on > site! > > -----Original Message----- > From: Chris.Coyle@mail.swedish.org [SMTP:Chris.Coyle@mail.swedish.org] > Sent: Friday, December 03, 1999 1:53 PM > To: linac-eng@plato1.aristotle.net > Subject: Varian 120 leaf MLC > > Are there any recent problems with the Varian 120 leaf MLC. We considering > upgrading our 80 leaf. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian 120 leaf MLC Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D816@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: RE: Varian 120 leaf MLC Date: Fri, 3 Dec 1999 13:05:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Maybe someone besides me should respond to this? Things are progressing.....guess that is all I want to say at the moment. Richard L. Kimball Chief Clinical Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Chris.Coyle@mail.swedish.org [mailto:Chris.Coyle@mail.swedish.org] Sent: Friday, December 03, 1999 12:53 PM To: linac-eng@plato1.aristotle.net Subject: Varian 120 leaf MLC Are there any recent problems with the Varian 120 leaf MLC. We considering upgrading our 80 leaf. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian 120 leaf MLC Message-ID: From: "Barnes, Bill" To: "'David Bisciotti, MSc'" Cc: "Linac-Eng (E-mail)" Subject: RE: Varian 120 leaf MLC Date: Fri, 3 Dec 1999 15:19:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" HERE IS VARIAN'S CHANCE TO SHOW THEY CARE... DO THEY WANT TO CONTRIBUTE TO OUR LIST IN A CONSTRUCTIVE WAY OR NOT... BILL BARNES -----Original Message----- From: David Bisciotti, MSc [mailto:daveb@nshs.edu] Sent: Friday, December 03, 1999 4:10 PM To: 'Chris.Coyle@mail.swedish.org'; Linac Engineers (E-mail) Subject: RE: Varian 120 leaf MLC We have been going thru motors like crazy.......They fail during initialization. We have also noticed that failures follow whenever the machine crashes overnight and is "cold" in the morning (Could be contraction of the leaves - increased friction?) In the last two months we have replaced no less than 12 motors....(10% failure rate...hmm...) On the positive side, replacing the motors is very simple, and fast (about 10 minutes) - Varian has been very supportive by keeping a good supply on site! -----Original Message----- From: Chris.Coyle@mail.swedish.org [SMTP:Chris.Coyle@mail.swedish.org] Sent: Friday, December 03, 1999 1:53 PM To: linac-eng@plato1.aristotle.net Subject: Varian 120 leaf MLC Are there any recent problems with the Varian 120 leaf MLC. We considering upgrading our 80 leaf. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100EX Gantry Speed Message-ID: <01BF3DAD.49396D00.daveb@nshs.edu> From: "David Bisciotti, MSc" To: "Linac Engineers (E-mail)" Subject: 2100EX Gantry Speed Date: Fri, 3 Dec 1999 13:41:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone have a Published spec on the gantry rotation speed for a Varian High Energy machine - 2100 EX (I think its about 1RPM?) I have a machine with a portal imager on it and the gantry is not well balanced and the gantry speed was reduced down to a crawl in order to successfully do arcs.... Any specs on the speed and alignment would be appreciated... ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian 120 leaf MLC Message-ID: <01BF3DA8.DAFA4CA0.daveb@nshs.edu> From: "David Bisciotti, MSc" To: "'Chris.Coyle@mail.swedish.org'" , "Linac Engineers (E-mail)" Subject: RE: Varian 120 leaf MLC Date: Fri, 3 Dec 1999 13:10:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have been going thru motors like crazy.......They fail during initialization. We have also noticed that failures follow whenever the machine crashes overnight and is "cold" in the morning (Could be contraction of the leaves - increased friction?) In the last two months we have replaced no less than 12 motors....(10% failure rate...hmm...) On the positive side, replacing the motors is very simple, and fast (about 10 minutes) - Varian has been very supportive by keeping a good supply on site! -----Original Message----- From: Chris.Coyle@mail.swedish.org [SMTP:Chris.Coyle@mail.swedish.org] Sent: Friday, December 03, 1999 1:53 PM To: linac-eng@plato1.aristotle.net Subject: Varian 120 leaf MLC Are there any recent problems with the Varian 120 leaf MLC. We considering upgrading our 80 leaf. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 120 leaf MLC Message-ID: <8825683C.0067E08A.00@ntip01.swedish.org> From: Chris.Coyle@mail.swedish.org To: linac-eng@plato1.aristotle.net Subject: Varian 120 leaf MLC Date: Fri, 3 Dec 1999 10:52:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Are there any recent problems with the Varian 120 leaf MLC. We considering upgrading our 80 leaf. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: pfn pots ccw, carrousel Message-ID: <0.e62be65a.25794627@aol.com> From: Accelinear@aol.com To: jmaddox@jcrt.harvard.edu, linac-eng@plato1.aristotle.net Subject: Re: pfn pots ccw, carrousel Date: Fri, 3 Dec 1999 08:13:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Those of you who have had to lower the pfn repeatedly what measurements have you made of forward power. Maybe your klystrons are becoming more efficient with age. I should think that such an improvement could possibly be explained by cathode changes or internal stud shifting. Martin Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Need Philips superficial x-ray tube Message-ID: <19991203155146.11914.qmail@web1305.mail.yahoo.com> From: Douglas Steers To: linac-eng@plato1.aristotle.net Subject: Need Philips superficial x-ray tube Date: Fri, 3 Dec 1999 07:51:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello linac engineers, My company is the world wide distributor of the Pantak Therapax superficial and Orthovoltage x-ray therapy systems. (Also the Bucky Grenz ray, and Faxitron specimen irradiators). From time to time we assist users of other manufacturers systems in an effort to get their equipment back on line by providing tubes and parts I stockpile from old systems I take as trade in's when selling Therapax new systems. We do this purely as a not for profit service; I am not a parts broker. Currently, I have an urgent need to replace a defective Philips RT 100 tube at a site which is not currently in a position to install a new system. If anyone knows the whereabouts of a good, used (of course, since they are obsolete) RT 100 tube, please contact me as soon as possible. Please either reply via e-mail, FAX or telephone. Fax number is (USA) 203-790-9529 Telephone (toll free in US and Canada) 1-877-797-9181. e-mail either to my office : therapax@yahoo.com, or my personal e-mail: steersdad@aol.com All responses are considered confidential. Payment is via company, check, wire transfer, or Cash in USD. Please help me help my customer. Kind regards, Doug Steers Pantak Therapax Products __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: MLC startup problem. Message-ID: <0.335818b7.2578c872@aol.com> From: SMcna39074@aol.com To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: MLC startup problem. Date: Thu, 2 Dec 1999 23:17:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I've seen this on an 80 leaf machine. We changed the Motcomm PCB in the control computer for the side affected and the problem disappeared. I ordered new RAM chips from Varian, but have not installed them yet. Could also be due to a thermal problem or poor connection on the card-- the card sags in the socket unless its tie wrapped. Stan at Cancer Center of Santa Barbara, CA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: pfn pots ccw, carrousel Message-ID: <01BF3CF7.02FBAC60.jmaddox@jcrt.harvard.edu> From: Jerry Maddox To: "'linac-eng@plato1.aristotle.net'" Subject: pfn pots ccw, carrousel Date: Thu, 2 Dec 1999 15:56:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have the same pfn pot problem on a 5 yr old 2100cd. Pfn has needed frequent adjustments for a year, pots moving toward ccw. Pfn v on screen has dropped about 1 out of 33, all modes. (upgraded to 5.2 about a year ago, assume screen cal is the same.) Deq circuits checked out, program pcb to divider, all seems well. If I believe the screen, can't be DEQ. Something in RF sytem. T drive most likely, but seems ok. Had to adj 12e stud to be able to peak pfn. Checked the afc starve tuned (lo Rf) many times, always find best manual freq same as auto, afc ok. Note that some servo loops, afc and steering, will saturate and not recover if too far off. Beam off and on to be sure. Looking at raw afc signals (per Jeremy) on scope, subtracting, you should have a symmetrical error signal above and below resonance. Bad ldpwr2 observed suggests waveguide---e sw, rotary joint, circulator, gasket, etc. Hope not! TX for info! Had a carrousel problem where frequencies were wrong on backplane , causing wrong config data to controller. Loose connection. Old c2 machine. Data book describes the freq, I think. Causes many interlocks, not fixed by pcb. Interlocks are generated by comparing console and carrousel bcd signals. Had to clean and lube bearing on same machine, many intermittent interlocks. If there is a problem, carrousel will stop while moving. Find the LED displays very useful, also moving in manual mode. Can see switches, pot v, pin, etc. Very helpful to record the data for each mode. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: MLC startup problem. Message-ID: From: Don Melsness To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: RE: MLC startup problem. Date: Thu, 2 Dec 1999 09:32:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Keejan, We had this identical problem several months ago on our 80-leaf (21EX and just out of warranty). It was occurring about once a week and only after the first initialization in the morning. The messages were the same as yours, indicating some problem with Crg A Motcom PCB. We decided to swap (side A <-> side B) the Motcom Processor PCBs which reside in the Controller computer. After we did this, we have not had a reoccurence of the problem. Note: earlier version MLC controllers have two PCBs for each side - a Motor Controller and a Controller Transceiver. These have now been combined into one PCB called the Motcom Processor. Regards, Don Melsness BC Cancer Agency Vancouver, Canada -----Original Message----- From: CJ.de.Bruijne@walcheren.ziekenhuis.nl [mailto:CJ.de.Bruijne@walcheren.ziekenhuis.nl] Sent: Wednesday, December 01, 1999 5:59 AM To: linac-eng@plato1.aristotle.net Subject: MLC startup problem. Hi colleagues, Here is a totally different problem from the Netherlands. Once or twice a week our MLC comes up with the following messages during the daily startup: >Mlcxcal.txt values: >Askew = -20 , Bskew = 0 >Leaf gap error= -35 ; Centerline offset = 0 >leaves per carriage = 26 >Combocomm : Gantry ; Model Mark 2 >Crg A Motcomm PCB : one of taxi clocks is bad >Crg A Motcomm PCB : Ram bad >Motcomm PCB not working properly >Initializing >Assertion failed : pTaxi -> IO ! = Null, file ..\pkgtaxi.c , line 1787 >Abnormal program termination . >General error reading drive C: The last line does suggest there are harddisk problems. While checking this disk we found none. Do any of you have the same messages/problems? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel control I/F pcb Message-ID: <0.3e53eb37.2576ea94@cs.com> From: PilotDaveR@cs.com To: Mlaa@aol.com, Linac-eng@plato1.aristotle.net Subject: Re: Carrousel control I/F pcb Date: Wed, 1 Dec 1999 13:18:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Other problems could also cause this problem and it will appear as if it is an interface problem. I have one question and some suggestions. 1) What is the fault code on the L.E.D. display? 2) Centering of the carousel Pot. Should read 5.00VDC when the carrousel is at correct position for each energy. 3) Plunger should lock into hole when carrousel has reached final position. Check switch contact S 9. 4) Try lubing the carousel chain. This has caused the carousel to overshoot the correct position and the plunger will not seat if the chain is dry. Remove air pressure, unlock the plunger and rotate by hand while spraying Tri-Flow. I hope this helps. Good Luck. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: MLC startup problem. Message-ID: From: Carl Murphy To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: MLC startup problem. Date: Wed, 1 Dec 1999 07:28:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'd replace the hard drive. We saw this problem with an 80 leaf on one of our machines which was under warranty about a year ago. Scandisk never reported any errors. Seemed to be an erratic problem. Make and image of the hard drive on a zip disk (be sure to get all of the hidden files as well) and just throw in the new hard drive. You might have to change some BIOS settings, but other than that, it should run tickety-boo. Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca >>> 12/01 9:59 AM >>> Hi colleagues, Here is a totally different problem from the Netherlands. Once or twice a week our MLC comes up with the following messages during the daily startup: >Mlcxcal.txt values: >Askew = -20 , Bskew = 0 >Leaf gap error= -35 ; Centerline offset = 0 >leaves per carriage = 26 >Combocomm : Gantry ; Model Mark 2 >Crg A Motcomm PCB : one of taxi clocks is bad >Crg A Motcomm PCB : Ram bad >Motcomm PCB not working properly >Initializing >Assertion failed : pTaxi -> IO ! = Null, file ..\pkgtaxi.c , line 1787 >Abnormal program termination . >General error reading drive C: The last line does suggest there are harddisk problems. While checking this disk we found none. Do any of you have the same messages/problems? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel control I/F pcb Message-ID: <38453804.B229912B@wfubmc.edu> From: tcullen@wfubmc.edu To: Mlaa@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Carrousel control I/F pcb Date: Wed, 1 Dec 1999 07:00:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, just a thought but, it would appear the pcb at fault would be the mode control not the I/F. Mlaa@aol.com wrote: > Hello to all on the list, > > I have a question regarding the carr. cntl. I/F pcb. We had one fail on a cl > 2100 s/n 300. We have recieved 3 boards from Varian which all have the same > symptoms. The boards will not clear the carr, targ, foil,tdrv, and ensw > interlocks. I tried to calibrate the mode control pcb, but am unable to > because of the above mentioned faults. Has anyone else had this problem with > new boards being sent from Varian, or is there a set up procedure for the > control I/F board? Any help would be appreciated. Thanks in advance. > > Mike Liddicote > Accelerator Associates ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: MLC startup problem. Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: MLC startup problem. Date: Wed, 1 Dec 1999 05:59:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi colleagues, Here is a totally different problem from the Netherlands. Once or twice a week our MLC comes up with the following messages during the daily startup: >Mlcxcal.txt values: >Askew = -20 , Bskew = 0 >Leaf gap error= -35 ; Centerline offset = 0 >leaves per carriage = 26 >Combocomm : Gantry ; Model Mark 2 >Crg A Motcomm PCB : one of taxi clocks is bad >Crg A Motcomm PCB : Ram bad >Motcomm PCB not working properly >Initializing >Assertion failed : pTaxi -> IO ! = Null, file ..\pkgtaxi.c , line 1787 >Abnormal program termination . >General error reading drive C: The last line does suggest there are harddisk problems. While checking this disk we found none. Do any of you have the same messages/problems? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Carrousel control I/F pcb Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: Mlaa@aol.com Cc: linac-eng@plato1.aristotle.net Subject: RE: Carrousel control I/F pcb Date: Wed, 1 Dec 1999 05:42:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > -----Original Message----- > From: Mlaa@aol.com [SMTP:Mlaa@aol.com] > Sent: Wednesday, December 01, 1999 7:18 AM > To: linac-eng@plato1.aristotle.net > Subject: Carrousel control I/F pcb > > Hello to all on the list, > > I have a question regarding the carr. cntl. I/F pcb. We had one fail on a > cl > 2100 s/n 300. We have recieved 3 boards from Varian which all have the > same > symptoms. The boards will not clear the carr, targ, foil,tdrv, and ensw > interlocks. I tried to calibrate the mode control pcb, but am unable to > because of the above mentioned faults. Has anyone else had this problem > with > new boards being sent from Varian, or is there a set up procedure for the > control I/F board? Any help would be appreciated. Thanks in advance. > > Mike Liddicote > Accelerator Associates > Mike, I cant remember we had a problem in that zone. But it sounds to something odd. Did you check jumpers, PROM's, S/W versions, (DIP)-switches and all that stuff? Three broken boards on arrival sounds very unlikely. Good luck, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Nucletron Therapax 150 Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: Re: Nucletron Therapax 150 Date: Wed, 1 Dec 1999 00:46:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a Pantak Therapax 150, assuming it is the same, these faults often occur on warmup and are often just glitches that can be ignored. However we have had some which have been more serious, but this is usually flagged by some other fault when you try to continue, or run in manual mode IE under mA etc. Check the following if you haven't already done so, remove ht cable at tube end and check cable and insert for tracking, ensure cable is not over tightened causing a compression fault. Many other things can also cause this fault to show, but running in manual mode usually shows the real cause. We have had, flywheel diodes fail in the inverter ( must be a matched pair), fil series regulator failure, Fil switching PCB relay faults etc etc. Good luck Brian Whitlock MTO Radiotherapy Physics Poole Hospital >>> "Joe Czarnecki" 11/30/99 04:03pm >>> Hello group, I would like to know if other owners of Therapax 150's have "supply trip" interlocks. We keep getting them and our machine was installed in September and has been down several days at a time. I do believe no patients have completed treatment on this machine. I would like feedback to other peoples problems. Thanks, Joe Czarnecki RISS III BJC Health Systems Clinical Engineering St. Louis, MO 63110 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Cl.2100C: PFN pots end CCW - update Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: yorkej@cbhc.ns.ca Cc: linac-eng@plato1.aristotle.net Subject: RE: Cl.2100C: PFN pots end CCW - update Date: Wed, 1 Dec 1999 00:53:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jeremy, Thanks for thinking. It is as you describe: after detuning the AFC it wont come back to output. But it is not at one side, but both sides. We checked AFC A&B cristal signals, tuned them at the gun driver for same amplitude (C2 machine) but this has no effect, so we set it back. This machine had a weak working AFC since installation (1993) Thats why we are thinking of setting up AFC from beginning to end. But maybe AFC is not the main problem. When peaking for output sometimes we find the PFN-pot out of tuning and at other times we have to turn the AFC-pot a lot. Strange thing is that sometimes we find peak-output with a 'bad' shaped LDPWR2-signal at the scope. (So: no max output at minimal reflected power in LDPWR2) Yeah, its a really tough one! Regards, Keesjan > -----Original Message----- > From: Jeremy Yorke [SMTP:yorkej@cbhc.ns.ca] > Sent: Tuesday, November 30, 1999 11:01 PM > To: 'CJ.de.Bruijne@walcheren.ziekenhuis.nl' > Subject: RE: Cl.2100C: PFN pots end CCW - update > > Hello, > > You have mentioned the AFC system a couple times now, are you saying that > if you manually "detune" the AFC that it will only recover from one > direction?? If this is the case, you may want to check the AFC A and B > signals as maybe one of the crystal diodes for the AFC feedback is > pooched. > If you have a C2 or C3 version there is is selector switch on the gun > driver module which will enable you to monitor the 'raw" AFC A and B > signals from the diodes at the console. I believe they should be very > close in amplitude.(?????) Hope this helps, if indeed I am understanding > the problem correctly. Let me know how you make out. > > Good luck > Jeremy > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Carrousel control I/F pcb Message-ID: <0.55c7b20e.2576177a@aol.com> From: Mlaa@aol.com To: linac-eng@plato1.aristotle.net Subject: Carrousel control I/F pcb Date: Tue, 30 Nov 1999 22:17:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all on the list, I have a question regarding the carr. cntl. I/F pcb. We had one fail on a cl 2100 s/n 300. We have recieved 3 boards from Varian which all have the same symptoms. The boards will not clear the carr, targ, foil,tdrv, and ensw interlocks. I tried to calibrate the mode control pcb, but am unable to because of the above mentioned faults. Has anyone else had this problem with new boards being sent from Varian, or is there a set up procedure for the control I/F board? Any help would be appreciated. Thanks in advance. Mike Liddicote Accelerator Associates ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Job Posting Message-ID: From: Steve Andrews To: "'linac-eng@plato1.aristotle.net'" Subject: Job Posting Date: Tue, 30 Nov 1999 16:42:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Technical Options Incorporated is an Ohio based ISO specializing in the service, refurbishing, and relocation of radiation therapy equipment. We are seeking experienced linac and therapy simulator engineers for job opportunities as equipment installers and field service engineers. Technical Options offers competitive salaries and excellent benefits. Please respond in confidence to: Steve Andrews Technical Options, Inc. 213 Dayton Road Newark, Ohio 43055 email : steveandrews@toptions.com Voice: 800-322-0802 Fax: 740-344-3630 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Nucletron Therapax 150 Message-ID: <001201bf3b4c$7a4d41e0$052b187e@joec> From: Joe Czarnecki To: linac-eng@plato1.aristotle.net Subject: Nucletron Therapax 150 Date: Tue, 30 Nov 1999 08:03:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello group, I would like to know if other owners of Therapax 150's have "supply trip" interlocks. We keep getting them and our machine was installed in September and has been down several days at a time. I do believe no patients have completed treatment on this machine. I would like feedback to other peoples problems. Thanks, Joe Czarnecki RISS III BJC Health Systems Clinical Engineering St. Louis, MO 63110 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Cl.2100C: PFN pots end CCW - update Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Cl.2100C: PFN pots end CCW - update Date: Tue, 30 Nov 1999 05:58:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all. Thanks for your replies. Here is an update: - We checked the T-drive: No loose rods or plunger-end. There is a little backlash when the plunger reaches the rod: it pushes the wheel nearly a millimeter down. (same behavior at our other machine) - Our DQ-ing is between 40% and 60% - also as the fault happens. (we had a bad DQ-pcb a few weeks ago - thought that THAT was the 'bad guy') - We found that we don't have a REFL PWR at the console. Broken wire? (we have to check this yet) - We are thinking of retuning the AFC servo-gain, while none of the energies come back from end-steering. That is it for now. Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ADAC Systems Digitizer Message-ID: <0.af61c983.2574442f@aol.com> From: Smeliin@aol.com To: "Wilson, Jim" Subject: Re: ADAC Systems Digitizer Date: Mon, 29 Nov 1999 13:03:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Try BG Technologies--phone 888-228-3241. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: lasers Message-ID: <4.1.19991129234029.009475f0@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: lasers Date: Mon, 29 Nov 1999 20:43:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks to all who have generously responded to my inquiry. This morning I returned from the U.S. holiday and found several helpful replies, and with followup I expect to specify some good reliable lasers for the new cancer center here to purchase. Good day to all, John ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Rotary joint part number Message-ID: <000501bf3a96$aa16f580$7446a698@pwserver> From: Steve Schwarz To: Oktay.Ureten@science.ankara.edu.tr Cc: linac-eng@plato1.aristotle.net Subject: Rotary joint part number Date: Mon, 29 Nov 1999 10:21:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Oktay, The Gantry swivel joint is VA# 28-430040; The Stand swivel joint is VA#28-840002. We carry these items under product ID 85 6139-0C and 85 6141-0C at our online parts store (www.acceletronics.com). Current pricing is listed and these items are available for online ordering and immediate shipment. We also carry a swivel joint seal repair kit, also available online, under product ID#85 6140-00, if you desire to repair the defective part yourself. I hope this information helps and please do not hesitate to contact us if you require any additional information. Thank you & My Regards, Steve Schwarz, Acceletronics ubj: Rotary Joint Part Number Date: 11/29/1999 2:28:58 AM Central Standard Time From: Oktay.Ureten@science.ankara.edu.tr (Oktay Ureten) Sender: owner-linac-eng@plato1.aristotle.net To: Hi Fellow Linac_Engs, I need to find the part number of the rotary joint used in the water system of Clinac 2300. (There are two of them). I could not find it in the manuals. Is this a secret of Varian? :) Oktay Ureten ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Rotary Joint Part Number Message-ID: <38429854.81596241@wfubmc.edu> From: tcullen@wfubmc.edu To: Oktay Ureten Cc: linac-eng@plato1.aristotle.net Subject: Re: Rotary Joint Part Number Date: Mon, 29 Nov 1999 07:14:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Oktay, the P/N 2843004000 is used in the 2100C's we have. It is an OPW Dover Corp. swivel joint. Oktay Ureten wrote: > Hi Fellow Linac_Engs, > > I need to find the part number of the rotary joint used in the water > system of Clinac 2300. (There are two of them). I could not find it in the > manuals. Is this a secret of Varian? :) > > Oktay Ureten ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Siemens Mevatron: F12 not respond Message-ID: <38424A36.5BA2779A@unison.com.tw> From: =?iso-8859-1?Q?=C4=AC=ACf=BE=C7?= To: linac-eng Subject: Siemens Mevatron: F12 not respond Date: Mon, 29 Nov 1999 01:41:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, The function key F12 of the keyboard does not respond intermittently ( about 3 times a day) after download a treatment field from Lantis. When the problem happens user have to reset the keyboard and download the field again, then F12 will come back normal. We have swapped the keyboard, replaced a new console I/O board, and checked the +/- 12V +5V DC console power. We have no idea what to do next. Does anyone have the same problem before. Any hints would be appreciated. Thanks & Best Regards Victor Su ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Equipment available. Message-ID: <001001bf39ff$5cdd1660$e1461ed1@lsegovia> From: Luis Segovia To: Linac List Subject: Equipment available. Date: Sun, 28 Nov 1999 16:18:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The following equipment is available for sale: 1. Varian CL 6-100 2. Siemens Mevatron 77; 20MV, 6-20 electrons 3. Oldelft Simulix Y 4. Will take best bid. Interested parties please contact: Luis Segovia Acceleparts, L.L.C. (713) 523-4013 Voice (713) 523-4051 Fax lsegovia@flash.net ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re: Cl.2100C: PFN pots end CCW Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: re: Cl.2100C: PFN pots end CCW Date: Sun, 28 Nov 1999 10:59:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, And I thought I got all the tough ones..... The only thing I can suggest is your T drive. It would have to be something common to all energies like the bottom not falling off etc.... Good luck. Dave ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: lasers, corrected Message-ID: From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: FW: lasers, corrected Date: Fri, 26 Nov 1999 08:03:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello John Those lasers are made by Duroline and have a 5 year warranty. Bill Barnes -----Original Message----- From: Barnes, Bill [mailto:B_Barnes@FCCC.EDU] Sent: Friday, November 26, 1999 9:01 AM To: 'John Somers' Cc: Linac-Eng (E-mail) Subject: RE: lasers, corrected Hello John, We installed the Scanditronix Emerald lasers(15 of them)(Green), they are a diode laser with sub millimeter line thickness. We looked at all available lasers and chose the Emeralds over everyone else because of the clarity, projected line length,thickness and visibility. I would highly recommend them. The green laser is great because it is VERY VISIBLE in all situations BILL BARNES BIO ENGINEER FOX CHASE CANCER CENTER PHILADELPHIA 215-728-2997 -----Original Message----- From: John Somers [mailto:somers@radonc17.ucsf.edu] Sent: Thursday, November 25, 1999 12:21 AM To: linac-eng@plato1.aristotle.net Subject: Fwd: lasers, corrected Somehow I seem to have deleted the word "diode" from my original message. As some people figured out, that's what I was trying to ask about. So here it is corrected. > >Good day to all, > We are fitting up a new facility with 3 new linac rooms. Does anyone have >experience with using wall-mounted DIODE lasers instead of the plasma tube >lasers? I'm wondering if they might give better long-term reliability? > Thanks for any info. > > John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Cl.2100C: PFN pots end CCW Message-ID: <004001bf3827$3216d3a0$8d26fea9@pacbell.net> From: Domenic Greco To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: Re: Cl.2100C: PFN pots end CCW Date: Fri, 26 Nov 1999 07:59:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Have you checked the T-drive? A common problem is that the base of the drive rod unscrews, causing an effective increase in stud height, and causing you to lower your PFN voltage. Domenic Greco Radiation Electronics, Inc. dgreco@pacbell.net ----- Original Message ----- From: To: Sent: Friday, November 26, 1999 4:54 AM Subject: Cl.2100C: PFN pots end CCW > > > Hi folks, > > > > We have a funny symptom at our Cl.2100 sn.417. > > Once in a while (a week or a month) we have to retune the machine, > > because the doserate of serveral energies becomes low. > > We never have to touch the GUN-I pot, just peaking PFN & AFC > > will do the job. > > We wrote down the PFN voltages at the edge of the program pcb's > > and the funny thing is that every time they become lower. > > Now serveral pots have reached their CCW end, so we decided to > > change some R's at the program boards. > > At the moment the machine is fine, but we have a unhappy feeling > > about this. What is going on? > > Do one of you have the same experience with a Clinac? > > > > For those of you who are interested, here are some details: > > * The effect is at ALL energies > > * We saturated the klystron > no change > > * No change in perveance > > * Turning the PFN pot CCW wil INcrease the DQ-ing, so LESS energy > > will go to the klystron > we'r running cheaper and cheaper :-) > > * When going out of resonance the AFC often does'nt steer back - > > but this may be an other problem. > (We checked the connections and diode signals over and over) > > > Waitin for your reply, > > > > Regards, > > Keesjan de Bruijne > > Ziekenhuis Walcheren > > Vlissingen, the Netherlands > > afd. DIA > > cj.de.bruijne@walcheren.ziekenhuis.nl > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Cl.2100C: PFN pots end CCW Message-ID: <85256835.00566214.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Re: Cl.2100C: PFN pots end CCW Date: Fri, 26 Nov 1999 07:43:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Have you checked what your De'Q percentage is? It should be about 50%, if it is not you could get something like what you are seeing. What is the TAP setting of the HV Transformer/Plate Transformer, you may need to change it up or down a tap. Are you finding problems with all energies? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fwd: Magnetrons Message-ID: <0.fbe51199.256ff8cf@aol.com> From: Accelinear@aol.com To: LINAC-ENG@plato1.aristotle.net Subject: Fwd: Magnetrons Date: Fri, 26 Nov 1999 06:53:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" ------_=_NextPart_002_01C19966.172FB140 Content-Type: message/rfc822 Message-ID: <0.4625b33.256e226f@aol.com> From: Accelinear@aol.com To: dmelsnes@bccancer.bc.ca Subject: Re: Magnetrons Date: Wed, 24 Nov 1999 21:26:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain Reviewing the most recent product literature from EEV I note that the only significant differance between a 5167 and 5193 is the tested maximum pulse repetition rate. The 67 is spec'd for 210pps while the 93 is spec''d for 280pps. I can speak from experience that I've found few cases where the 93 could not be replaced with the much less expensive 67 for medical use. Just for info the MG prefix means that the tube has a machined anode rather than a braised structure. This is a much more reliable manufacturing method and the "MG" tubes appear to last much longer than the "M" equivalents. The MG 6165 I believe (shown on EEV's web page) is only manufactured for Varian at this time though a generic equivalent has been promised. Data is not generally published for this tube but it likely has slightly higher output ratings than the 2.6MW MG-5167,5193 tubes and likely allows for a slightly higher pulse rep. rate as may be needed on a high output 4X - 600C. Therefore the MG 6165 could be used in place of the other tubes but the inverse is not necessarily advisable. A MG 5193 will likely work well in all Varian 4/6-100 machines as well as most 600Cs. An MG 5167 will also operate just fine for most cases too though one should keep an eye on the operating rep. rate. Marty Shapiro ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: lasers, corrected Message-ID: From: "Barnes, Bill" To: 'John Somers' Cc: "Linac-Eng (E-mail)" Subject: RE: lasers, corrected Date: Fri, 26 Nov 1999 06:01:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello John, We installed the Scanditronix Emerald lasers(15 of them)(Green), they are a diode laser with sub millimeter line thickness. We looked at all available lasers and chose the Emeralds over everyone else because of the clarity, projected line length,thickness and visibility. I would highly recommend them. The green laser is great because it is VERY VISIBLE in all situations BILL BARNES BIO ENGINEER FOX CHASE CANCER CENTER PHILADELPHIA 215-728-2997 -----Original Message----- From: John Somers [mailto:somers@radonc17.ucsf.edu] Sent: Thursday, November 25, 1999 12:21 AM To: linac-eng@plato1.aristotle.net Subject: Fwd: lasers, corrected Somehow I seem to have deleted the word "diode" from my original message. As some people figured out, that's what I was trying to ask about. So here it is corrected. > >Good day to all, > We are fitting up a new facility with 3 new linac rooms. Does anyone have >experience with using wall-mounted DIODE lasers instead of the plasma tube >lasers? I'm wondering if they might give better long-term reliability? > Thanks for any info. > > John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Cl.2100C: PFN pots end CCW Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Cl.2100C: PFN pots end CCW Date: Fri, 26 Nov 1999 04:54:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Hi folks, > > We have a funny symptom at our Cl.2100 sn.417. > Once in a while (a week or a month) we have to retune the machine, > because the doserate of serveral energies becomes low. > We never have to touch the GUN-I pot, just peaking PFN & AFC > will do the job. > We wrote down the PFN voltages at the edge of the program pcb's > and the funny thing is that every time they become lower. > Now serveral pots have reached their CCW end, so we decided to > change some R's at the program boards. > At the moment the machine is fine, but we have a unhappy feeling > about this. What is going on? > Do one of you have the same experience with a Clinac? > > For those of you who are interested, here are some details: > * The effect is at ALL energies > * We saturated the klystron > no change > * No change in perveance > * Turning the PFN pot CCW wil INcrease the DQ-ing, so LESS energy > will go to the klystron > we'r running cheaper and cheaper :-) > * When going out of resonance the AFC often does'nt steer back - > but this may be an other problem. (We checked the connections and diode signals over and over) > Waitin for your reply, > > Regards, > Keesjan de Bruijne > Ziekenhuis Walcheren > Vlissingen, the Netherlands > afd. DIA > cj.de.bruijne@walcheren.ziekenhuis.nl > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Philips RT250 Message-ID: <000501bf3771$10c2d7a0$3e9c8cd4@default> From: "." Reply-To: "." To: linac digest Subject: Philips RT250 Date: Thu, 25 Nov 1999 10:14:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" GOING FREE........... Philips RT250 xray head unit ---------------------------- We acquired this unit approximately 4 yrs ago as a second-hand spare for our machine. It was taken from a to-be decommissioned machine from another hospital. Tube hours are unknown but it was believed to be in a working condition when we acquired it. Details from the units ID tag are: Philips RT250 Tube TO 250/15 Type: 9811 260 00001 250 kV Going free to a good home! Buyer collects. Contact me at scm1@surfree.co.uk or seanmurphy@e36m3evo.freeserve.co.uk if interested. Regards Sean Murphy Senior MTO RSH Hospital Southampton UK ___________________________________________________________ - Disclaimer - The information and views expressed in this text are those of the author alone and should in no way be taken to express those of the Department or Trust management. ___________________________________________________________ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: hose crimping systems Message-ID: <0.931c6925.256ed22b@aol.com> From: Accelinear@aol.com To: sthiesson@scf.sk.ca, linac-eng@plato1.aristotle.net Subject: Re: hose crimping systems Date: Thu, 25 Nov 1999 09:55:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Interestingly many manufacurers have available lines of hose products that don't require clamps or crimps at the low pressures found in linac uses. Few users seem willing to trust that method though. Sort of like using double stick tape to secure blocks to trays. Those who use it love it, the rest of us function out of fear. For years JMCompany used a very nice gray plastic hose without clamps in all their rebuilds. Never saw one leak either. Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: hose crimping systems Message-ID: <383D4ED7.8DB95B39@scf.sk.ca> From: S Thiesson To: Linac eng Subject: hose crimping systems Date: Thu, 25 Nov 1999 06:59:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I was wondering what type brand of crimping system people use for making up their linac hoses. I was looking into the coll-o-crimp system. Does anybody out there use this system? Scot Thiesson Sr. Physics Tech. A.B.C.C. Regina ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: lasers, corrected Message-ID: From: "Kloster, Stephen" To: 'John Somers' , linac-eng@plato1.aristotle.net Subject: RE: lasers, corrected Date: Wed, 24 Nov 1999 14:36:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi John, We use Cemarligne solid state lasers in 2 of our treatment rooms. They have been extremely reliable for us. I would not even consider using tube lasers for a new installation. Regards, Steve Kloster Electronics technologist Kingston Regional Cancer Centre Kingston, Ontario Canada -----Original Message----- From: John Somers [mailto:somers@radonc17.ucsf.edu] Sent: Thursday, November 25, 1999 12:21 AM To: linac-eng@plato1.aristotle.net Subject: Fwd: lasers, corrected Somehow I seem to have deleted the word "diode" from my original message. As some people figured out, that's what I was trying to ask about. So here it is corrected. > >Good day to all, > We are fitting up a new facility with 3 new linac rooms. Does anyone have >experience with using wall-mounted DIODE lasers instead of the plasma tube >lasers? I'm wondering if they might give better long-term reliability? > Thanks for any info. > > John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re magnetrons Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Re magnetrons Date: Wed, 24 Nov 1999 11:21:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" While on a 2100 course someone mentioned about the 600CD machine. It was some time back and only a passing mention but......... the difference is that the green cap version is required in the CD for the higher dose rates. There will be internal differences too but it is likely that the green cap (MG 6165 ??????) will perform well in a C machine. The (5193 ?????) will not handle the CD machine. Check with Varian to confirm this. Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: lasers Message-ID: <383C364E.13D6FAB1@scf.sk.ca> From: S Thiesson To: John Somers Cc: linac-eng@plato1.aristotle.net Subject: Re: lasers Date: Wed, 24 Nov 1999 11:02:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi John We are using our own laser mounts with the Cemarligne boxes mounted on them. We had some initial troubles with their earlier units but they seem to have worked out the design fairly well. We have maybe a module fail every two years or so. The laser diodes are field replaceable though. Good luck Scot Thiesson Sr. Physics Tech. Regina Canada John Somers wrote: > Good day to all, > We are fitting up a new facility with 3 new linac rooms. Does anyone have > experience with using wall-mounted lasers instead of the plasma tube > lasers? I'm wondering if they might give better long-term reliability? > Thanks for any info. > > John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Magnetrons Message-ID: From: Don Melsness To: Carl Murphy , linac-eng@plato1.aristotle.net Subject: RE: Magnetrons Date: Wed, 24 Nov 1999 10:07:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl, Our 600C, S/N 417 here also uses the MG 6165. I believe that this magnetron is just a 5193 with a green cap and RF foam insulation under it, so there shouldn't be a problem using it in either of your units. Don Melsness BC Cancer Agency Vancouver -----Original Message----- From: Carl Murphy [mailto:CCCHM@qe2-hsc.ns.ca] Sent: Wednesday, November 24, 1999 5:21 AM To: linac-eng@plato1.aristotle.net Subject: Magnetrons Does anyone know the difference between these EEV maggies: MG 6165 and MG 5193 The reason why I ask is that I was told that they are the same maggie, just one part number is used by Varian. I have a 600C S/N 311 with a MG 5193 and a S/N 494 with a MG 6165. I would like to know if I can use a 6165 on both units because I have a spare. Thanks, Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: lasers Message-ID: <4.1.19991124215142.0095cc00@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: lasers Date: Wed, 24 Nov 1999 18:54:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good day to all, We are fitting up a new facility with 3 new linac rooms. Does anyone have experience with using wall-mounted lasers instead of the plasma tube lasers? I'm wondering if they might give better long-term reliability? Thanks for any info. John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SL Target Check Pot Assy Message-ID: <99Nov24.170752gmt.115204@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Cc: bobl@ulth.northy.nhs.uk, GERALDR@ulth.northy.nhs.uk, jalanw@ulth.northy.nhs.uk, johnw@ulth.northy.nhs.uk, martinb@ulth.northy.nhs.uk, robertw@ulth.northy.nhs.uk, STEVED@ulth.northy.nhs.uk, steves@ulth.northy.nhs.uk, stevew@ulth.northy.nhs.uk, stuartla@ulth.northy.nhs.uk, timc@ulth.northy.nhs.uk Subject: SL Target Check Pot Assy Date: Wed, 24 Nov 1999 09:07:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We've recently had the little spring that maintains pressure on the target/flight tube check pot lever fail. I'm curious to know if the failure of this spring is just an isolated incident or if other centres have experienced the problem also? If it turns out that everyone's "had a snapper" then it's probably worth replacing while you've got all the lead out on your annual PMI . Chris Forrest Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Magnetrons Message-ID: <383C1157.7965FF18@wfubmc.edu> From: tcullen@wfubmc.edu To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Magnetrons Date: Wed, 24 Nov 1999 08:24:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl, I have a early 600C (042) with a 5167 in it, manuf. date 1988. Amazing. The 5193 was the replacement for the 5167 I think, and to tell you the truth all maggies I remember were 5xxx series. The 6165 must be another breed altogether and fairly new. Probably an experimental model that will last you till the warranty runs out :-|) Carl Murphy wrote: > Does anyone know the difference between these EEV maggies: > > MG 6165 > and > MG 5193 > > The reason why I ask is that I was told that they are the same maggie, > just one part number is used by Varian. > > I have a 600C S/N 311 with a MG 5193 and a S/N 494 with a MG 6165. I > would like to know if I can use a 6165 on both units because I have a > spare. > > Thanks, > > Carl Murphy, C.E.T. > Electronics Engineering Technologist > Medical Physics Department > Nova Scotia Cancer Centre > Queen Elizabeth II Health Sciences Centre > phone: (902) 473-6152 > fax: (902) 473-6120 > email: ccchm@qe2-hsc.ns.ca > > > > > > > > > > > > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Magnetrons Message-ID: <383BFA5E.F9026D66@yale.edu> From: "Peter E. Vitali" To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Magnetrons Date: Wed, 24 Nov 1999 06:47:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl: You can find EEV on the WEB at http://www.EEV.com. You can phone them in the USA at 914-592-6050. E-Mail: info@eevinc.com. The USA Corporate Offices is located at 4 Whestchester Plaza, P.O. Box 482, Elmsford, N.Y. 10523-0482. Pete Vitali ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Magnetrons Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Magnetrons Date: Wed, 24 Nov 1999 05:20:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone know the difference between these EEV maggies: MG 6165 and MG 5193 The reason why I ask is that I was told that they are the same maggie, just one part number is used by Varian. I have a 600C S/N 311 with a MG 5193 and a S/N 494 with a MG 6165. I would like to know if I can use a 6165 on both units because I have a spare. Thanks, Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: flow interlock Message-ID: <383B66C1.4F0D8A96@aristotle.net> From: Jim Beaty To: Kurt Knibutat Cc: Linac Eng Listserver Subject: Re: flow interlock Date: Tue, 23 Nov 1999 20:17:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The target lines aren't the only ones you need to watch. We just replaced the entire loop on flowswitch S3 for this same problem. Took the machine down to replace the dedicated keyboard, and it came back up with a flow fault. All the lines in this loop were swollen internally. Kurt Knibutat wrote: > Salih > > Your target water lines could be swollen internally. Check them > at the manifolds behind the gantry display. If the interior > looks cracked and spongy they need to be replaced. The > restriction caused by the reduced interior dimension will trip > the associated flow interlock switch. This has happened on > three of our units. One of which was in service for only 2.5 > years. > -- > Kurt Knibutat > Tom Baker Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: shutdown at beam on Message-ID: <0.cb981529.256ca893@aol.com> From: Accelinear@aol.com To: RvrRtMark@aol.com, linac-eng@plato1.aristotle.net Subject: Re: shutdown at beam on Date: Tue, 23 Nov 1999 18:33:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" One possible and may I say textbook cause is a sticking step-start relay. On this machine it is "fun" to change. Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: flow interlock Message-ID: <383B068B.F9021779@cancerboard.ab.ca> From: Kurt Knibutat To: salih bulut Cc: Linac Eng Listserver Subject: Re: flow interlock Date: Tue, 23 Nov 1999 13:26:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Salih Your target water lines could be swollen internally. Check them at the manifolds behind the gantry display. If the interior looks cracked and spongy they need to be replaced. The restriction caused by the reduced interior dimension will trip the associated flow interlock switch. This has happened on three of our units. One of which was in service for only 2.5 years. -- Kurt Knibutat Tom Baker Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: oldeft simulix MC light problem Message-ID: <383AFA46.D1DD3AC9@wfubmc.edu> From: tcullen@wfubmc.edu To: salih bulut Cc: linac-eng@plato1.aristotle.net Subject: Re: oldeft simulix MC light problem Date: Tue, 23 Nov 1999 12:34:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Salih, I would use the remote pendant and watch the A50 panel when this happens. You can watch the LEDs to see which ssr is going bad or watch the top right of the bottom panel K70, K130, and K131 for sticking contacts. You may want to check your 24VDC supply when this is happening also. good luck salih bulut wrote: > Dear Friends > > Our machine lights some times are mixing i.e when I > turn off the laser, also the field light turns off or > randomly the field light turns off. Or when I turn the > room light off also the field light turns off. I have > adjusted the lights to work independently. > Important: The problem occurs sometimes > > > __________________________________________________ > Do You Yahoo!? > Bid and sell for free at http://auctions.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: shutdown at beam on Message-ID: From: "Nelson, Steve" To: "'RvrRtMark@aol.com'" , linac-eng@plato1.aristotle.net Subject: RE: shutdown at beam on Date: Tue, 23 Nov 1999 10:44:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I had the same problem with 2100 sn 246. Ended up being a loose connection on the customer interface board. Everything was ready to go to beam on. Once initiated the 24v line dropped to a couple of volts in the modulator, and the machine went to Emergency Off. Took a long time to find it and 2 seconds to fix. Could be many other things though. Happy hunting. regards, Stephen > -----Original Message----- > From: RvrRtMark@aol.com [SMTP:RvrRtMark@aol.com] > Sent: Tuesday, November 23, 1999 1:27 PM > To: linac-eng@plato1.aristotle.net > Subject: shutdown at beam on > > Hi Everybody, > We have a CL1800 s/n 39 that intermittently shuts down > > hard at beam on. The following has been done or replaced- new DQ thy., > new > main thy., new dequing amp, resaturated klystron. Any ideas? Thanks in > advance, you've been a big help before- > Mark Brideson > RAS > Sacramento, CA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: shutdown at beam on Message-ID: <0.5fd4e68a.256c3672@aol.com> From: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: shutdown at beam on Date: Tue, 23 Nov 1999 10:26:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everybody, We have a CL1800 s/n 39 that intermittently shuts down hard at beam on. The following has been done or replaced- new DQ thy., new main thy., new dequing amp, resaturated klystron. Any ideas? Thanks in advance, you've been a big help before- Mark Brideson RAS Sacramento, CA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: flow interlock Message-ID: <383A9C9C.8DFA9846@wfubmc.edu> From: tcullen@wfubmc.edu To: salih bulut Cc: linac-eng@plato1.aristotle.net Subject: Re: flow interlock Date: Tue, 23 Nov 1999 05:54:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Salih, I suggest using the system diagram to TS this problem and if the 2300 is anything like the 2100 you could have other problems, such as the switch in the oil tank for the klystron, that gives a flow I/L. Or you could have a bad thermal switch up by the bmag. Any way the system diag will show you the series path the -12V ON takes for this I/L. You failed to say how much PSI the pump was putting out but Dave is right about the phasing of the motor. This usually only happens if they do something like a major repair on the incoming line power and fail to put the cabling back the way it came off. If you have proper power and phasing on the motor with clean water and you still have low pressure, the only way to increase the PSI is to buy a new pump. salih bulut wrote: > I HAVE A FLOW INTERLOCK PROPLEM ON 2300 C/D C3 > MACHINE. > THERE ARE 6 FLOW SWITCHES WORKING CORRECTLY. BUT THE > SWITCHES SEEM OPEN BECAUSE OF THE FLOW PUMP MOTOR DONT > GIVE ENOUGH PRESSURE. > MY QUESTION IS HOW CAN I INCREASE THE PRESSURE? > __________________________________________________ > Do You Yahoo!? > Bid and sell for free at http://auctions.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: oldeft simulix MC light problem Message-ID: <19991123104906.21089.rocketmail@web210.mail.yahoo.com> From: salih bulut To: linac-eng@plato1.aristotle.net Subject: oldeft simulix MC light problem Date: Tue, 23 Nov 1999 02:49:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Friends Our machine lights some times are mixing i.e when I turn off the laser, also the field light turns off or randomly the field light turns off. Or when I turn the room light off also the field light turns off. I have adjusted the lights to work independently. Important: The problem occurs sometimes __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Arm support - Varian 600C Message-ID: <002d01bf358f$6b0be3c0$140a0180@vig066> From: davef@rmpdsch.freeserve.co.uk Reply-To: Dave Farrell To: linac-eng@plato1.aristotle.net Subject: Arm support - Varian 600C Date: Tue, 23 Nov 1999 00:47:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, The patient arm support accessory (pt. no. 856807.0) for our 600C is broken! The problem is the small knob that locks the sliding mechanism has suffered stripped threads over years of use. Our mechanical workshop guru informs me that these threads are left-handed, therefore the damaged components would be difficult to repair or replicate with our existing tooling. Varian UK do not have any drawings for this accessory immediately to hand, and so are unable to easily provide a part number for the small knob and insert. They are able to supply the complete accessory, but it needs to be sourced in the States. As well as being expensive, it will take a while to arrive. I have been advised that many centres have not used this device from the day it was supplied with the machine, and consequently many may be gathering dust. Can anybody spare the knob and threaded insert, or even the whole accessory :-) ? Cheers Dave _______________________________ David Farrell Medical Physics South Cleveland Hospital Middlesbrough Cleveland TS4 3BW United Kingdom +44 1642 854778 x3157 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: flow interlock -Reply Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: flow interlock -Reply Date: Mon, 22 Nov 1999 16:21:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The flow system on both of 2100 C machines produce 60PSI at the pump. This is for a 50Hz country. If the pump is producing that then there is enough pressure. If not there is probably a pump fault. Most probably the pump going the wrong way. To correct this swap any two input phases to the pump - I dont think there are any other phase rotation dependant parts of the linac. I have come across a flow restrictor which was over half blocked this would make only one flow switch activate. I have also come across a batch of reeds from the flow switches which had a slightly high resistance (0.5 - 1.0 ohms). This gave intermittent flow interlocks. Good luck. Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: flow interlock Message-ID: <19991122214013.11203.rocketmail@web208.mail.yahoo.com> From: salih bulut To: linac-eng@plato1.aristotle.net Subject: flow interlock Date: Mon, 22 Nov 1999 13:40:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I HAVE A FLOW INTERLOCK PROPLEM ON 2300 C/D C3 MACHINE. THERE ARE 6 FLOW SWITCHES WORKING CORRECTLY. BUT THE SWITCHES SEEM OPEN BECAUSE OF THE FLOW PUMP MOTOR DONT GIVE ENOUGH PRESSURE. MY QUESTION IS HOW CAN I INCREASE THE PRESSURE? __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: mfil 600c Message-ID: From: "Nelson, Steve" To: "'Bob.Tonks@lrcc.on.ca'" , GWilson@wph.trent.nhs.uk, linac-eng@plato1.aristotle.net Subject: RE: mfil 600c Date: Thu, 18 Nov 1999 07:40:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I think Bob's on the right track, the Mfil also comes from that box me thinks. Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 843-792-3271 nelson@radonc.musc.edu > -----Original Message----- > From: Bob.Tonks@lrcc.on.ca [SMTP:Bob.Tonks@lrcc.on.ca] > Sent: Thursday, November 18, 1999 9:14 AM > To: GWilson@wph.trent.nhs.uk; linac-eng@plato1.aristotle.net > Subject: Re: mfil 600c > > > > The ion chamber power supply and vacuum supply are from the same box. It > could > be caused by a faulty cover switch or loose cover. I think I would check > that > and clean the circuit board edge connections on the Vacion interlock > board. I > would also check the vacuum levels of the tube just as a precaution. > > Good luck, Bob Tonks > London Regional Cancer Centre > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: mfil 600c Message-ID: <38341884.8A9958CA@wfubmc.edu> From: tcullen@wfubmc.edu To: Bob.Tonks@lrcc.on.ca Cc: GWilson@wph.trent.nhs.uk, linac-eng@plato1.aristotle.net Subject: Re: mfil 600c Date: Thu, 18 Nov 1999 07:17:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" You could replace the opto-iso's at the same time also. By the way, take my advice and remove power from the machine before doing anything with this Vacion I/L pcb. Bob.Tonks@lrcc.on.ca wrote: > The ion chamber power supply and vacuum supply are from the same box. It could > be caused by a faulty cover switch or loose cover. I think I would check that > and clean the circuit board edge connections on the Vacion interlock board. I > would also check the vacuum levels of the tube just as a precaution. > > Good luck, Bob Tonks > London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Varian MLC initializing... Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB4D9@liosex1.lio.se> From: Viking Eilert To: "'Kerry.Price@advocatehealth.com'" , "Linac-Eng (E-postl)" Subject: SV: Varian MLC initializing... Date: Thu, 18 Nov 1999 06:08:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Maybe the problem isn't Impac related?? I remember a while ago we had a simular problem with our MLC mark 1 # 20, 52 leaves on our Cl-2100C #248. We use VARiS. (We don't have = Impac). I don't recall at all the details of the problem. What I do remember is that Varian have a service technical bulletin (STB) that should fix the problem. They told us that they usually = install the STB only when the customer have the problem with reinitializing by itself. Our problem wasn't that frequent. We never did install the STB. = I don't know if it's dependent of software version because we have not = had the problem for a long time. It must be a at least a year since we had the problem. (I think we were running MLC version 3.9 more than a year ago. = Now we have version 4.8). Eilert Viking =20 Accelerator engineer Link=F6ping, Sweden aaaaaaaaaaaaaaaaaaaaa > Hello All. I am new to this list. >=20 > Kerry, >=20 > Here at the Princess Margaret Hospital we were running many = iterations > IMPAC > v4.x until recently moving to version 5. We have two Varian 52 leaf = MLCs > running controller v3.9 and have never experienced this problem in = the two > years we were running IMPAC v4.x. Do you know the exact version = number of > your IMPAC software? When did you first experience this problem? Was = it > after a version change of IMPAC, or did it manifest itself after = another > event? >=20 > Terry Michaelson > Director-Technical Systems > Radiation Medicine Program > The Princess Margaret Hospital > A member of the University Health Network > Please note my new email address > terry.michaelson@rmp.uhn.on.ca > (416)946-6532 >=20 > aaaaaaaaaaaaaaaaaa >=20 > Kerry, > There was some discussion about this way back but I don't recall the > result. > As you may already know, the MLC controller can't initialize itself > without > a command via MLCX.EXE. It is my guess that the IMPAC controller = computer > must be sending this INITIALIZE command via a serial link. I don't = know > how > it does that. The Varian MLC would not do this on its' own accord. >=20 > Richard L. Kimball > Senior Engineer > Department of Radiation & Cellular Oncology=20 > The University of Chicago Medical Center > 773.702.6879 >=20 > aaaaaaaaaaaaaaaa >=20 > Any insight into the following problem would be much = appreciated. > =20 > We have a Varian 52 leaf MLC running ver 3.9 on the controller = and > the=20 > workstation. We are also running IMPAC v4.0. After the plan is = > called up in IMPAC and the leaves are going to the planned = position=20 > and while the gantry is moving, usually toward 270 degrees = (IEC), the >=20 > MLC re-initializes on its own. > =20 > I have no idea what could be causing this. Do you? > =20 > Kerry Price > Lutheran General Hospital > Park Ridge, Illinois USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Ximatron PS2 replacement Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB4DA@liosex1.lio.se> From: Viking Eilert To: "'Caunt, Peter'" , "Linac-Eng (E-postl)" Subject: SV: Ximatron PS2 replacement Date: Thu, 18 Nov 1999 06:19:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable We are going to let Varian replace our IBM PS/2 286 on our Ximatron CX #243. Varian recommended us to use the (TM56696000) Service = technical bulletin (STB) XC-144A "ISA 486 computer upgrade" 847120-0030, US$3500, because customers not using the STB had have different kind of = problems. Eilert Viking Accelerator engineer Link=F6ping, Sweden =20 aaaaaaaaaaaaaaaaaaa > This inquiry concerns replacement of the control computer (IBM PS2 = model > 30) > on a Varian Ximatron s/no 140. >=20 > Is there a preferred replacement type ?, is the serial comms (ISA) = board > still useable ?, does software require upgrading ?=20 >=20 > Any information about such replacement and possible pitfalls would be > greatly appreciated. >=20 > Many thanks, >=20 > Peter Caunt > Radiation Oncology > The Canberra Hospital, > Canberra, Australia. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: mfil 600c Message-ID: <697DE9C94DFED211A6DB00A0C9067D870B90D9@bilbo.wph.trent.nhs.uk> From: GWilson@wph.trent.nhs.uk To: linac-eng@plato1.aristotle.net Subject: mfil 600c Date: Thu, 18 Nov 1999 04:05:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Has anyone seen the following on a 600c Machine switches to standby very intermittently with the following interlocks ION 1- ION 2- VAC 2 and MFIL This is always preceded by a couple occurrences of DS12. All the obvious and many of the not so obvious checks have been carried out to no avail. The problem is very intermittent so does not adversely interrupt treatment, however the problem has become personal!!! any help appreciated. Glynn Weston Park Hospital Sheffield UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron PS2 replacement Message-ID: <000951210631D311B91A00A0C9DED0B867AC4A@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato1.aristotle.net'" Subject: Ximatron PS2 replacement Date: Wed, 17 Nov 1999 21:12:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This inquiry concerns replacement of the control computer (IBM PS2 model 30) on a Varian Ximatron s/no 140. Is there a preferred replacement type ?, is the serial comms (ISA) board still useable ?, does software require upgrading ? Any information about such replacement and possible pitfalls would be greatly appreciated. Many thanks, Peter Caunt Radiation Oncology The Canberra Hospital, Canberra, Australia. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ADAC Systems Digitizer Message-ID: <0.a37b6499.2564845a@aol.com> From: Radsrus@aol.com To: "Wilson, Jim" , linac-eng@plato1.aristotle.net Subject: Re: ADAC Systems Digitizer Date: Wed, 17 Nov 1999 14:21:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, Summagraphics & CalComp makes digitizers & tablets and their products can be seen at the web site www.gtcocalcomp.com The Summagraphics cursors are prob not Numonics compatible but at that price, you can probably get a new cursor & tablet, depending on the size & resolution of the tablet you're using. Another thing (or first thing) you could try (if you haven't already) would be to ask Numonics for a different model cursor, but compatible with the one thats broken. FOr example, if you have a corded model, you can ask for the cordless upgrade.. just a thought. Hope this helps and good luck, Steve Schwarz, Acceletronics In a message dated 11/17/1999 3:37:45 PM Central Standard Time, JWilson3@providence.org writes: > ubj: ADAC Systems Digitizer > Date: 11/17/1999 3:37:45 PM Central Standard Time > From: JWilson3@providence.org (Wilson, Jim) > Sender: owner-linac-eng@plato1.aristotle.net > To: linac-eng@plato1.aristotle.net ('Linac Bulletin Board Posting') > > We have an ADAC therapy planning system that needs a 4 button digitizing > cursor. Numonics, the manufacturer, won't sell to us because of an agreement > with ADAC. ADAC wants (choke) $1000 for this item. Help. > > Jim Wilson > Clinical Engineering > Providence Health Systems ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian MLC initializing... Message-ID: <99Nov17.153555est.115846@gateway.healthlink.on.ca> From: "Michaelson, Terry" To: 'Richard Kimball' , "'Kerry.Price@advocatehealth.com'" , linac-eng@plato1.aristotle.net Subject: RE: Varian MLC initializing... Date: Wed, 17 Nov 1999 12:29:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All. I am new to this list. Kerry, Here at the Princess Margaret Hospital we were running many iterations IMPAC v4.x until recently moving to version 5. We have two Varian 52 leaf MLCs running controller v3.9 and have never experienced this problem in the two years we were running IMPAC v4.x. Do you know the exact version number of your IMPAC software? When did you first experience this problem? Was it after a version change of IMPAC, or did it manifest itself after another event? Terry Michaelson Director-Technical Systems Radiation Medicine Program The Princess Margaret Hospital A member of the University Health Network Please note my new email address terry.michaelson@rmp.uhn.on.ca (416)946-6532 "PAY NO ATTENTION TO THE MAN BEHIND THE CURTAIN!" -Frank L. Baum > -----Original Message----- > From: Richard Kimball [SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > Sent: Wednesday, November 17, 1999 9:57 AM > To: 'Kerry.Price@advocatehealth.com'; linac-eng@plato1.aristotle.net > Subject: RE: Varian MLC initializing... > > Kerry, > There was some discussion about this way back but I don't recall the > result. > As you may already know, the MLC controller can't initialize itself > without > a command via MLCX.EXE. It is my guess that the IMPAC controller computer > must be sending this INITIALIZE command via a serial link. I don't know > how > it does that. The Varian MLC would not do this on its' own accord. > > Richard L. Kimball > Senior Engineer > Department of Radiation & Cellular Oncology > The University of Chicago Medical Center > 773.702.6879 > > -----Original Message----- > From: Kerry.Price@advocatehealth.com > [mailto:Kerry.Price@advocatehealth.com] > Sent: Tuesday, November 16, 1999 2:25 PM > To: linac-eng@plato1.aristotle.net > Subject: Varian MLC initializing... > > > Any insight into the following problem would be much appreciated. > > We have a Varian 52 leaf MLC running ver 3.9 on the controller and > the > workstation. We are also running IMPAC v4.0. After the plan is > called up in IMPAC and the leaves are going to the planned position > and while the gantry is moving, usually toward 270 degrees (IEC), the > > MLC re-initializes on its own. > > I have no idea what could be causing this. Do you? > > Kerry Price > Lutheran General Hospital > Park Ridge, Illinois USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian MLC initializing... Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D7F4@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'Kerry.Price@advocatehealth.com'" , linac-eng@plato1.aristotle.net Subject: RE: Varian MLC initializing... Date: Wed, 17 Nov 1999 06:56:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kerry, There was some discussion about this way back but I don't recall the result. As you may already know, the MLC controller can't initialize itself without a command via MLCX.EXE. It is my guess that the IMPAC controller computer must be sending this INITIALIZE command via a serial link. I don't know how it does that. The Varian MLC would not do this on its' own accord. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Kerry.Price@advocatehealth.com [mailto:Kerry.Price@advocatehealth.com] Sent: Tuesday, November 16, 1999 2:25 PM To: linac-eng@plato1.aristotle.net Subject: Varian MLC initializing... Any insight into the following problem would be much appreciated. We have a Varian 52 leaf MLC running ver 3.9 on the controller and the workstation. We are also running IMPAC v4.0. After the plan is called up in IMPAC and the leaves are going to the planned position and while the gantry is moving, usually toward 270 degrees (IEC), the MLC re-initializes on its own. I have no idea what could be causing this. Do you? Kerry Price Lutheran General Hospital Park Ridge, Illinois USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Siemens Orthovoltage contacts? Message-ID: From: James Balter To: linac-eng@plato1.aristotle.net Subject: Siemens Orthovoltage contacts? Date: Tue, 16 Nov 1999 10:44:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi! Does anyone know of someone in Siemens that has expertise on installation og their orthovoltage unit? We are considering moving a unit out of our VA hospital and into an existing Co-60 treatment room in a research lab. Any hints would be appreciated! Thanks in advance, James Balter Department of Radiation Oncology University of Michigan Medical Center jbalter@umich.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian MLC initializing... Message-ID: <0000E114.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net Subject: Varian MLC initializing... Date: Tue, 16 Nov 1999 12:24:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Any insight into the following problem would be much appreciated. We have a Varian 52 leaf MLC running ver 3.9 on the controller and the workstation. We are also running IMPAC v4.0. After the plan is called up in IMPAC and the leaves are going to the planned position and while the gantry is moving, usually toward 270 degrees (IEC), the MLC re-initializes on its own. I have no idea what could be causing this. Do you? Kerry Price Lutheran General Hospital Park Ridge, Illinois USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Sick 600C... or is it? Message-ID: From: "Nelson, Steve" To: 'Richard Kimball' , 'Carl Murphy' , 'Linac Engineer ListServ' Subject: RE: Sick 600C... or is it? Date: Tue, 16 Nov 1999 05:31:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello group, While I was experiencing this problem, the charge current would change in amplitude and when it dropped in amplitude, it would run out of DQ . Of course when that happened the PFN V would drop for that pulse and hence the maggie. This then generated the yield fault after several groups of pulses like that occurred. regards, Stephen > -----Original Message----- > From: Richard Kimball [SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > Sent: Monday, November 15, 1999 5:15 PM > To: 'Carl Murphy'; 'Linac Engineer ListServ' > Subject: RE: Sick 600C... or is it? > > Actually Carl, and please someone correct me if I am wrong, the period can > change while the amplitude of the Charge I pulse should not. > > Richard L. Kimball > Senior Engineer > Department of Radiation & Cellular Oncology > The University of Chicago Medical Center > 773.702.6879 > > -----Original Message----- > From: Carl Murphy [mailto:CCCHM@qe2-hsc.ns.ca] > Sent: Monday, November 15, 1999 1:41 PM > To: linac-eng@plato1.aristotle.net > Subject: Sick 600C... or is it? > > > Continuing on my 600C: > > Came in this morning. Machine runs fine. I am still running the s**t > out of it (that is the technical term). > > The problem came back. We swept the AFC manually and it ran fine again. > I am suspecting that there is some crap in the maggie. We're going to > replace it anyway since we have one on the way. > > The weird thing was, not only was dequing changing, but the amplitude > (understandable) AND the period (strange!?). So obviously there was > some strange frequency response loading down the PFN. Will keep an eye > on it and let you know the final result. As of now, the machine runs > fine. > > Thanks for all the suggestions. > > Carl Murphy, C.E.T. > Electronics Engineering Technologist > Medical Physics Department > Nova Scotia Cancer Centre > Queen Elizabeth II Health Sciences Centre > phone: (902) 473-6152 > fax: (902) 473-6120 > email: ccchm@qe2-hsc.ns.ca > > > > > > > > > > > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: sick 600c Message-ID: <3830B87B.EA0F11DD@connect.net> From: james pinkerton Reply-To: jimkaren@connect.net To: Linac-Eng Subject: Re: sick 600c Date: Mon, 15 Nov 1999 17:50:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, I just changed out a maggie on a 4/100 two months ago with the same sort of failure mode. Batch problems??? Regards, Jim Pinkerton ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Sick 600C... or is it? Message-ID: <99Nov15.174046est.115783@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: Sick 600C... or is it? Date: Mon, 15 Nov 1999 14:34:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, you're right. But it WILL go down if your input DC drops. The period will also change, since it needs to charge longer! Regards, Tom Feuerstake PMH Toronto -----Original Message----- From: Richard Kimball [SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] Sent: Monday, November 15, 1999 5:15 PM To: 'Carl Murphy'; 'Linac Engineer ListServ' Subject: RE: Sick 600C... or is it? Actually Carl, and please someone correct me if I am wrong, the period can change while the amplitude of the Charge I pulse should not. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Sick 600C... or is it? Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D7EF@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Carl Murphy' , 'Linac Engineer ListServ' Subject: RE: Sick 600C... or is it? Date: Mon, 15 Nov 1999 14:14:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Actually Carl, and please someone correct me if I am wrong, the period can change while the amplitude of the Charge I pulse should not. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Carl Murphy [mailto:CCCHM@qe2-hsc.ns.ca] Sent: Monday, November 15, 1999 1:41 PM To: linac-eng@plato1.aristotle.net Subject: Sick 600C... or is it? Continuing on my 600C: Came in this morning. Machine runs fine. I am still running the s**t out of it (that is the technical term). The problem came back. We swept the AFC manually and it ran fine again. I am suspecting that there is some crap in the maggie. We're going to replace it anyway since we have one on the way. The weird thing was, not only was dequing changing, but the amplitude (understandable) AND the period (strange!?). So obviously there was some strange frequency response loading down the PFN. Will keep an eye on it and let you know the final result. As of now, the machine runs fine. Thanks for all the suggestions. Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Sick 600C... or is it? Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Sick 600C... or is it? Date: Mon, 15 Nov 1999 11:40:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Continuing on my 600C: Came in this morning. Machine runs fine. I am still running the s**t out of it (that is the technical term). The problem came back. We swept the AFC manually and it ran fine again. I am suspecting that there is some crap in the maggie. We're going to replace it anyway since we have one on the way. The weird thing was, not only was dequing changing, but the amplitude (understandable) AND the period (strange!?). So obviously there was some strange frequency response loading down the PFN. Will keep an eye on it and let you know the final result. As of now, the machine runs fine. Thanks for all the suggestions. Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: intermittent xsdr faults Message-ID: <942698281.27867.293@excite.com> From: Mike Nordin To: Linac-eng@plato1.aristotle.net Subject: intermittent xsdr faults Date: Mon, 15 Nov 1999 12:38:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Some Questions Varian 600c/d, 5.4 software, Portal Vision MK-2 installed not used(pfs servo installed and operational) It is my understanding that the xsdr trips when the dose rate exceeds 150% of nominal servo output(per Varian school literature) i.e. with dose rate selected of 400r/min, a dose rate of 600r/min would trip the fault. This fault is not excess dose per pulse so am I correct in my assumption that in order for xsdr to trip that there must be an increase in prf? Could the pfs servo be at fault if so where to monitor. My techs accept the new calculated freq during morning warmup as suggested by the manufacture. Faults are not less frequient and when portal vision is put on line that wouldn't be practical. Thanks in advance m.nordin Likely suspect Control Timer ________________________________________________________________ Get FREE voicemail, fax and email at http://voicemail.excite.com Talk online at http://voicechat.excite.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sick 600C con't Message-ID: <38302FDF.32C38CC4@wfubmc.edu> From: tcullen@wfubmc.edu To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Sick 600C con't Date: Mon, 15 Nov 1999 08:07:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl, pulling at straws here, check the 100M resistor used for the pfn sample voltage divider. They have been known to break off and still arc over and make erratic contact. Carl Murphy wrote: > Sorry for the lack of detail on the last email. I am under the gun > here. When I turn the YLD servo off, it makes no difference. The > output is still erratic. Dequiing is erratic. Sometimes it is dequing, > sometimes not. Replaced the tube, no deal. Tried different YLD servo > PCB, no deal. Looking like it might be the pulse tank. Only problem > is, I can't find a part number for it. > > Seems like something is loading down the system. Could be the maggie. > I'd like to be able to attach an equivalent load and take the maggie out > of the circuit. Big job. Don't think it's the pulse cable. I figure > I'd smell burning or there would be arcing?! > > More suggestions welcome! > > Carl Murphy, C.E.T. > Electronics Engineering Technologist > Medical Physics Department > Nova Scotia Cancer Centre > Queen Elizabeth II Health Sciences Centre > phone: (902) 473-6152 > fax: (902) 473-6120 > email: ccchm@qe2-hsc.ns.ca > > > > > > > > > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Sick 600C con't Message-ID: From: "Nelson, Steve" To: 'Carl Murphy' Cc: 'Linac Engineers' Subject: RE: Sick 600C con't Date: Mon, 15 Nov 1999 05:59:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl, This sounds so familiar. I had the same problems and the answers were posted a while back. Look at the main thyratron and make sure that it is seated well in its socket. If so, you may want to take some of the slowdown coil windings out of the circuit in series with the main thyratron anode. We ended up taking half of the coil out to eliminate the problem. It is simple to try and may be the source of your problem. good luck, stephen > -----Original Message----- > From: Carl Murphy [SMTP:CCCHM@qe2-hsc.ns.ca] > Sent: Friday, November 12, 1999 1:05 PM > To: linac-eng@plato1.aristotle.net > Subject: Sick 600C con't > > Sorry for the lack of detail on the last email. I am under the gun > here. When I turn the YLD servo off, it makes no difference. The > output is still erratic. Dequiing is erratic. Sometimes it is dequing, > sometimes not. Replaced the tube, no deal. Tried different YLD servo > PCB, no deal. Looking like it might be the pulse tank. Only problem > is, I can't find a part number for it. > > Seems like something is loading down the system. Could be the maggie. > I'd like to be able to attach an equivalent load and take the maggie out > of the circuit. Big job. Don't think it's the pulse cable. I figure > I'd smell burning or there would be arcing?! > > More suggestions welcome! > > Carl Murphy, C.E.T. > Electronics Engineering Technologist > Medical Physics Department > Nova Scotia Cancer Centre > Queen Elizabeth II Health Sciences Centre > phone: (902) 473-6152 > fax: (902) 473-6120 > email: ccchm@qe2-hsc.ns.ca > > > > > > > > > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100c motors paramaters Message-ID: <0.d73bc0d3.2560fd02@aol.com> From: Mlaa@aol.com To: linac-eng@plato1.aristotle.net Subject: 2100c motors paramaters Date: Sun, 14 Nov 1999 22:06:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all on the list, My question is this: can anyone tell me what the parameter 1 and 2 define in the calibrate motors window? The window shows parameter 1, parameter 2, velocity 1, and velocity 2. I was working on an X2 jaw problem. I believe that the parameters 1 and 2 are in reference to acceleration and de-acceleration of the motors, but I am not sure. Can anyone help me with this? Thanks in advance. Mike Liddicote Accelerator Associates ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: computers and neutrons Message-ID: From: "Barry M. Berner" To: linac-eng@plato1.aristotle.net Subject: computers and neutrons Date: Sun, 14 Nov 1999 13:43:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" thermal neutrons will undergo capture to produce activation products such as au-198. as one respondent pointed out the scale of everything is getting smaller so that the beta particles produced during decay will have an increased chance of traversing a sensitive volume. a survey of the injured computer with a sodium iodide crystal might detect something. along the same lines wrapping the computer in borated polyethylene might stop the problem if the thermal neutrons are the culprit. barry m berner ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Computers in treatment rms. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Computers in treatment rms. Date: Sun, 14 Nov 1999 12:38:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In the early days of VARiS it was reccommended that the in room monitor PCs were installed in the room. We did that with 486 not very fast PCs (on shelves behind gantry). The PCs kept crashing on the high energy linacs. We moved them out of the room and they stopped crashing. There was some talk amongst our physics staff about alpha particles doing the dirty on us. A BIG question that I have been unable to resolve satisfactorily so far is...... What computer gear can be allowed into the room????? Ignoring the inbuilt uPs for now... Infusion stands ?????? Anesthetics trolleys?????? Pacemakers ????? etc??? And the inbuilts... PV systems? Accessory controllers? Carrousel controllers? etc ??? We have had an accessory controller crash on us once which may be related. This was brought to the manufacturer's attention at the time (June 1999). BEWARE there is NO WATCHDOG on this unit and a crash may not show an interlock. (based on information at hand). Could all manufacturers please supply list members with clear guidelines on what equipment should/should not be used in treatment rooms. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Cybex controls on Varian linacs Message-ID: <0.49d51aee.255e3c04@aol.com> From: Accelinear@aol.com To: LINAC-ENG@plato1.aristotle.net Subject: Cybex controls on Varian linacs Date: Fri, 12 Nov 1999 19:59:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I wish to bring to the attention of all users of C-series linacs ( and hopefully Varian management) a serious safety concern I have found at some newer installations. It seems that many users are adding Cybex remote control boxes to enable in-room control of service mode. At this point I am not sure as to whether or not this mode of installation has Varian's approval but it is being routinely done on new installations and it brings with it a great danger - the machine may be easily beamed on from within the treatment room. This is a really bad idea. As all servicemen of C-series linacs know one can use "pendant redirection" to allow virtually every control to be operated from an in-room pendant. The one exception has been that one cannot beam on. One must leave the room to beam on and then return to make observations or measurements. This added step insures technician safety. Especially so for that tired tech, operating the machine alone late at night. In my opinion the small added assistance that one derives from having the in room facility afforded by the Cybex box is far outweighed by the clear and present danger of its' accidental misuse. Martin Shapiro Accelinear Company ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sick 600C Message-ID: <001301bf2d7f$93755520$16301c3f@ELNjoeczarn> From: Joe Czarnecki To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Sick 600C Date: Fri, 12 Nov 1999 18:34:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl, Check your connections on your contactors in the aux power distribution, particularly the big one (K2). We had one with a bad connection and the connection with the wire was arcing. Seems to be a problem with this vintage machine. The one we had a problem with is CL-600C/D s/n 498. Joe Czarnecki RISS III BJC Health Systems St. Louis, MO ----- Original Message ----- From: Carl Murphy To: Sent: Friday, November 12, 1999 9:31 AM Subject: Sick 600C > 600C S/N 494. > > MagI fluctuating from 80 to 100. > > Constant YLD I/L. Replaced both thyratrons. Replaced all caps in PFN > (except for the 6 section cap... I'm doing that one now.) Line voltage > is ok. Bumped up tap transformer. No difference. The machine sounds > like it is struggling. > > Any suggestions?? > > Carl Murphy, C.E.T. > Electronics Engineering Technologist > Medical Physics Department > Nova Scotia Cancer Centre > Queen Elizabeth II Health Sciences Centre > phone: (902) 473-6152 > fax: (902) 473-6120 > email: ccchm@qe2-hsc.ns.ca > > > > > > > > > > > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Neutrons and Computers Message-ID: <382C8BC7.C034A134@scf.sk.ca> From: S Thiesson To: Richard Kimball Cc: "'Peter E. Vitali'" , "Linac-Engineers, Listserver" Subject: Re: Neutrons and Computers Date: Fri, 12 Nov 1999 13:51:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I think the newer class machines with the flash eproms for BIOS settings have problems in a noisy environment. We just received a new Portal Vision upgrade, putting the acquisition computer inside the room behind the gantry. I guess time will tell if this is the right location for it. Scot Thiesson A.B.C.C. Regina Sask. Canada Richard Kimball wrote: > We tried running Pentium class machines inside the treatment room on our > 2100C's to no avail. PC's would lock up and/or reboot by themselves. Ended > up using remote video/keyboard/mouse devices and leaving the PC outside the > room. Works great. I believe that linac vendors spec radiation hardened > components on circuit boards, although I know that I have used standard CMOS > chips inside old style Siemens linacs to no effect in performance. The > neutron theory seems logical to me. > > Richard L. Kimball > Senior Engineer > Department of Radiation & Cellular Oncology > The University of Chicago Medical Center > 773.702.6879 > > -----Original Message----- > From: Peter E. Vitali [mailto:peter.vitali@yale.edu] > Sent: Friday, November 12, 1999 11:15 AM > To: Medical Physics, Listserver; Linac-Engineers, Listserver > Subject: Neutrons and Computers > > To all members of both lists: > > Recently we had a problem with a computer in a piece of equipment > located in one of our treatment rooms. The computer was a new one and > within one week of being in the room it would not boot up correctly. > This first computer was replaced by a new one and within one week would > also not boot up correctly. The representative of the equipment (not > Varian) said that the problems was caused by neutrons in the room. He > said that the only places where they were having a problem was when the > equipment was in a treatment room where the photon energy was 10 MV or > above. The higher the energy the more breakdowns. We later spoke to a > representative of another company who said that they had to remove their > computers from inside of treatment rooms because of this problem. This > representative also stated that the problem was noticed in those > computers using the higher internal speeds and that they had not seen > the problem with computers using the 486 CPU due to the slower speeds of > these computers. That the cause was that the manufacture of the memory > chips in the computers, in order to obtain more speed, decreased the > thickness of the mask in the chips from 5 microns to 3 microns, which > then made them more susceptible to thermal neutrons. The neutrons would > then change the memory state in the chips. > > Question: Does anyone have more information on the above and is my > information correct? How many have seen this problem? Also since > shielding is not prefect, has anyone seen this problem with equipment > outside of the treatment room? Is this phenomena only effecting the > boot up memory or is it also affecting other memory in the computers? > > The computers that we had the problems with were in a treatment room > with a 6/18 MV linac. > > Peter E. Vitali, CBET > Therapeutic Radiological Engineer > Department of Radiation Physics > Yale-New Haven Hospital > 15 York Street > New Haven, CT. 06504 U.S.A. > Tel: 203 688-2948 > Fax: 203 688-3663 > E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Neutrons and Computers Message-ID: <457B79AC7AB2D211AAAC006097BDA65318D7EB@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'Peter E. Vitali'" , "Linac-Engineers, Listserver" Subject: RE: Neutrons and Computers Date: Fri, 12 Nov 1999 13:15:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We tried running Pentium class machines inside the treatment room on our 2100C's to no avail. PC's would lock up and/or reboot by themselves. Ended up using remote video/keyboard/mouse devices and leaving the PC outside the room. Works great. I believe that linac vendors spec radiation hardened components on circuit boards, although I know that I have used standard CMOS chips inside old style Siemens linacs to no effect in performance. The neutron theory seems logical to me. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Peter E. Vitali [mailto:peter.vitali@yale.edu] Sent: Friday, November 12, 1999 11:15 AM To: Medical Physics, Listserver; Linac-Engineers, Listserver Subject: Neutrons and Computers To all members of both lists: Recently we had a problem with a computer in a piece of equipment located in one of our treatment rooms. The computer was a new one and within one week of being in the room it would not boot up correctly. This first computer was replaced by a new one and within one week would also not boot up correctly. The representative of the equipment (not Varian) said that the problems was caused by neutrons in the room. He said that the only places where they were having a problem was when the equipment was in a treatment room where the photon energy was 10 MV or above. The higher the energy the more breakdowns. We later spoke to a representative of another company who said that they had to remove their computers from inside of treatment rooms because of this problem. This representative also stated that the problem was noticed in those computers using the higher internal speeds and that they had not seen the problem with computers using the 486 CPU due to the slower speeds of these computers. That the cause was that the manufacture of the memory chips in the computers, in order to obtain more speed, decreased the thickness of the mask in the chips from 5 microns to 3 microns, which then made them more susceptible to thermal neutrons. The neutrons would then change the memory state in the chips. Question: Does anyone have more information on the above and is my information correct? How many have seen this problem? Also since shielding is not prefect, has anyone seen this problem with equipment outside of the treatment room? Is this phenomena only effecting the boot up memory or is it also affecting other memory in the computers? The computers that we had the problems with were in a treatment room with a 6/18 MV linac. Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Neutrons and Computers Message-ID: <99Nov12.144537est.115774@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: Neutrons and Computers Date: Fri, 12 Nov 1999 11:39:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My guess is that it is not the Neutrons. Keep in mind, there are many electronic circuits in the machine, and these don't seem to be affected by the radiation. I don't know of any special electronics being used on the Linac pc boards, its mostly consumer grade stuff and it seems to survive. The neutron fluence is pretty well everywhere, in all directions in the room, since they bounce around and aren't slowed down by much. I'm assuming the computer is not in-line with the isocentre of the machine so that you are not irradiating directly into it! I would more suspect that it is interference from EMF radiated from the Linac modulator. It might be coming through ground from the wall outlet. When you turn on the beam on some of these machines, you get big noise spikes on pretty well every conductor in the vicinity. You can try to isolate the power supply using an isolation transformer or a CorCom filter. For your info we have Pentium computers in each of our 14 Linac rooms for the past 4 months. There hasn't been any problem to date. (However, now that I've said that..! And now my 600c is acting up just like the guy who wrote in this morning!) Regards, Tom Feuerstake PMH Toronto -----Original Message----- From: Peter E. Vitali [SMTP:peter.vitali@yale.edu] Sent: Friday, November 12, 1999 12:15 PM To: Medical Physics, Listserver; Linac-Engineers, Listserver Subject: Neutrons and Computers To all members of both lists: Recently we had a problem with a computer in a piece of equipment located in one of our treatment rooms. The computer was a new one and within one week of being in the room it would not boot up correctly. This first computer was replaced by a new one and within one week would also not boot ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sick 600C con't Message-ID: <382C5D77.A8ECD6CE@scf.sk.ca> From: S Thiesson To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Sick 600C con't Date: Fri, 12 Nov 1999 10:33:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I had a problem years ago with a D'Q thyratron intermittently shutting off. I traced the problem to a faulty socket connection for the filament. As the tube heated up it would cut out intermittently, when you went into the room to check the tube it would be cooled off enough to make the connection again. Scot Thiesson A.B.C.C. Regina Sask. Canada Carl Murphy wrote: > Sorry for the lack of detail on the last email. I am under the gun > here. When I turn the YLD servo off, it makes no difference. The > output is still erratic. Dequiing is erratic. Sometimes it is dequing, > sometimes not. Replaced the tube, no deal. Tried different YLD servo > PCB, no deal. Looking like it might be the pulse tank. Only problem > is, I can't find a part number for it. > > Seems like something is loading down the system. Could be the maggie. > I'd like to be able to attach an equivalent load and take the maggie out > of the circuit. Big job. Don't think it's the pulse cable. I figure > I'd smell burning or there would be arcing?! > > More suggestions welcome! > > Carl Murphy, C.E.T. > Electronics Engineering Technologist > Medical Physics Department > Nova Scotia Cancer Centre > Queen Elizabeth II Health Sciences Centre > phone: (902) 473-6152 > fax: (902) 473-6120 > email: ccchm@qe2-hsc.ns.ca > > > > > > > > > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sick 600C con't Message-ID: <85256827.0066D983.00@mail.lrcc.on.ca> From: Bob.Tonks@lrcc.on.ca To: Carl Murphy , linac-eng@plato1.aristotle.net Subject: Re: Sick 600C con't Date: Fri, 12 Nov 1999 10:43:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Carl, Got a question did you recently switch the main thyratron to the CX1140 that Varian has been using on the newer 2100's? We started using this unit instead of the CX1159 on all our machines but we started having similar problems to what you are having on our old 600C so we installed a CX1159 everything worked properly again. We are using CX1140's on all our 2100's and CX1159 on the 600C. I was never able to explain why the problems but have been satisfied with the results. Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Sick 600C con't Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Sick 600C con't Date: Fri, 12 Nov 1999 10:05:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry for the lack of detail on the last email. I am under the gun here. When I turn the YLD servo off, it makes no difference. The output is still erratic. Dequiing is erratic. Sometimes it is dequing, sometimes not. Replaced the tube, no deal. Tried different YLD servo PCB, no deal. Looking like it might be the pulse tank. Only problem is, I can't find a part number for it. Seems like something is loading down the system. Could be the maggie. I'd like to be able to attach an equivalent load and take the maggie out of the circuit. Big job. Don't think it's the pulse cable. I figure I'd smell burning or there would be arcing?! More suggestions welcome! Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Engineer position available Message-ID: <003601bf2d38$96791780$2919a8c0@Kevin> From: Kevin Kalbaugh Reply-To: Kevin Kalbaugh To: linac-eng@plato1.aristotle.net Subject: Engineer position available Date: Fri, 12 Nov 1999 10:05:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Free-standing radiation oncology practice with five (5) offices located in North Central Florida is seeking a second linac engineer. Position requires 3-5 yrs experience (Varian preferred). Individual must be self motivated with the ability to operate independently and work flexible hours. Extremely competitive salary and benefits. Experience with simulators a plus. This is an exciting and dynamic company located in a geographically desireable part of the country. For further information contact Mike Hill at mhill@rboi.org ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Neutrons and Computers Message-ID: <382C4ACF.89BCC50A@yale.edu> From: "Peter E. Vitali" To: "Medical Physics, Listserver" , "Linac-Engineers, Listserver" Subject: Neutrons and Computers Date: Fri, 12 Nov 1999 09:15:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all members of both lists: Recently we had a problem with a computer in a piece of equipment located in one of our treatment rooms. The computer was a new one and within one week of being in the room it would not boot up correctly. This first computer was replaced by a new one and within one week would also not boot up correctly. The representative of the equipment (not Varian) said that the problems was caused by neutrons in the room. He said that the only places where they were having a problem was when the equipment was in a treatment room where the photon energy was 10 MV or above. The higher the energy the more breakdowns. We later spoke to a representative of another company who said that they had to remove their computers from inside of treatment rooms because of this problem. This representative also stated that the problem was noticed in those computers using the higher internal speeds and that they had not seen the problem with computers using the 486 CPU due to the slower speeds of these computers. That the cause was that the manufacture of the memory chips in the computers, in order to obtain more speed, decreased the thickness of the mask in the chips from 5 microns to 3 microns, which then made them more susceptible to thermal neutrons. The neutrons would then change the memory state in the chips. Question: Does anyone have more information on the above and is my information correct? How many have seen this problem? Also since shielding is not prefect, has anyone seen this problem with equipment outside of the treatment room? Is this phenomena only effecting the boot up memory or is it also affecting other memory in the computers? The computers that we had the problems with were in a treatment room with a 6/18 MV linac. Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology Message-ID: <85256827.005AE324.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Re: Apology Date: Fri, 12 Nov 1999 08:32:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" There are three sides to every story, Yours, Mine and the Facts! (I don't know who coined that phrase but it is soooo true) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sick 600C Message-ID: <382C3DF4.6D836DBE@wfubmc.edu> From: tcullen@wfubmc.edu To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Sick 600C Date: Fri, 12 Nov 1999 08:19:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl, Tom is right. If the yield servo is weirding out on you the HVPS I signal should be too. The target current monitor could play into this also. good luck ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Sick 600C Message-ID: <99Nov12.110230est.115735@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: Sick 600C Date: Fri, 12 Nov 1999 07:56:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Check the HVPSI signal. One problem with it is that if the yield servo is on, it will try to correct for the mag current fluctuations. Switch the yield servo off and look at the HVPSI. It should be constant. If not, look at the 3 phase supplies etc. Maybe a bad contactor. Regards, Tom Feuerstake PMH Toronto -----Original Message----- From: Carl Murphy [SMTP:CCCHM@qe2-hsc.ns.ca] Sent: Friday, November 12, 1999 10:31 AM To: linac-eng@plato1.aristotle.net Subject: Sick 600C 600C S/N 494. MagI fluctuating from 80 to 100. Constant YLD I/L. Replaced both thyratrons. Replaced all caps in PFN (except for the 6 section cap... I'm doing that one now.) Line voltage is ok. Bumped up tap transformer. No difference. The machine sounds like it is struggling. Any suggestions?? Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Junior Linac Engineer Job Description Message-ID: <99Nov12.155029gmt.115203@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: Junior Linac Engineer Job Description Date: Fri, 12 Nov 1999 07:50:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Must have a basic interest in electronics but preference will be given to candidates who have experience of all the following : Electronic Engineering - (Analogue & Digital, DC to Microwave, Microwatts to Megawatts) Electrical Engineeing Mechanical Engineering Radiation Physics PC Configuration, Repair & Maintenance Programming Plumbing Pneumatics Networking - Wiring to Administration of Management - Staff & Quality Building Design Storekeeping Failing that, a good sense of humour.............. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Sick 600C Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Sick 600C Date: Fri, 12 Nov 1999 07:31:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" 600C S/N 494. MagI fluctuating from 80 to 100. Constant YLD I/L. Replaced both thyratrons. Replaced all caps in PFN (except for the 6 section cap... I'm doing that one now.) Line voltage is ok. Bumped up tap transformer. No difference. The machine sounds like it is struggling. Any suggestions?? Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: BONR Message-ID: <012601bf2cdc$21be2540$ee39fea9@pacbell.net> From: Domenic Greco To: Tim Cullen , linac-eng@plato1.aristotle.net Subject: Re: BONR Date: Thu, 11 Nov 1999 23:04:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" If the problem you speak of relates to phantom beam-offs, the remedy was a .1 cap added to the beam off line inside the dedicated keyboard (refer to DWG# 879761, pg 3 of 3, capacitor C31). Regards, Domenic Greco Radiation Electronics, Inc. ----- Original Message ----- From: Tim Cullen To: Sent: Thursday, November 11, 1999 1:39 PM Subject: BONR > BONR > I recently had this old problem pop up on a 600C 042 ver 5.4 Varian unit > and this unit has had the modification done to prevent this. I posed a > question to the Varian people from coast to coast and they are being a > little slow (fact: requested info 10/22/99) in responding. (that was > inoffensive wasn't it?) > So I am asking the lot of you if during the subsequent mods performed by > Varian they took into account the filter mod for the BONR problem they > had done on the Timer I/F pcb? Was the filter cap suppose to be soldered > onto the new Timer I/F pcbs or has one of you heard they engineered the > filtration into the subsequent mods? The new schematics do not reflect > this. > By the way there have been, or at least here we have done, at least two > upgrades that I can remember required the replacement of the Timer I/F > pcb. > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Equipment for sale Message-ID: <0.7ca7ebd9.255cbb9e@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Equipment for sale Date: Thu, 11 Nov 1999 16:38:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" BEST BID WILL BE ACCEPTED AVAILABLE IMMEDIATELY !!! SATURN 3 Linear Accelerator - Needs a Gun !!! late 80's model Successful bidder will be responsible for all removal & rigging costs including the customary liabilities. We can arrange for rigging & removal if required. Fax BIDS to: 661-257-3601 Thanks in advance Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Comparisons of Linacs Message-ID: <4.1.19991112021237.00946b80@radonc17.ucsf.edu> From: John Somers To: busht@shmc.org, "@plato1 (E-mail)" Subject: Re: Comparisons of Linacs Date: Thu, 11 Nov 1999 23:39:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 01:52 PM 11/10/99 -0800, Tom Bush wrote: >Does anyone out there have a list of performance or service advantages of >the latest Siemens and/or Philips Linacs with regard to the current varian >offerings? Any information on the positive aspects of these "other" Linacs >would be appreciated. Also, does anyone have first hand knowledge on the >availability of technical maintenance training for the in-house engineer >on these products. > >Regards, >Tom Bush > Hi Tom and everyone on the list, I have recently attended several Siemens training courses at the factory in Concord. These included service training on the Digital Mevatron, the MLC, and LANTIS. Next month I return for a few days on the PRIMUS machines, later on the ZXT table. In all courses so far there was a combination of in-house engineers such as myself along with Siemens field service engineers. In fact I'm now ahead of the local SMS FSE's as far as the direct training i've received. I came away with very large amounts of information, both printed in the manuals and from the class and lab notes, plus some info on CD and floppy disk. The class experience itself i would call "variable". Siemens training department seems to be a work in progress. By that i mean there has been a lot of turnover in instructors, plus extensive revision of the course materials and content. There's also a bit of a scramble there to have all the equipment available for hands-on labs. Each time i've gone there things seem to have improved. The instructors i've had were quite good and conscientious, but hampered somewhat by the situation. There is very little testing of either customers or employees. Maybe one of the best things is, there's a LOT of sharing of information and experience within the classes. So in effect, I taught a few things from my experience, other in-house people did some, and the more experienced of the Siemens FSE's did as well. This include a fair amount of the same complaints and frustrations that the rest of us have. It's been awhile since I had the varian and Philips courses, so wouldn't be able to compare with what they're currently doing. As far as comparing performance characteristics, i might be able to respond to some specific questions if you have those. Regards to all, John ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600c Mag Fil Message-ID: <199911112126.PAA26601@plato1.aristotle.net> From: JIM WALLACE Reply-To: JIM@gloria.force9.co.uk To: linac-eng@plato1.aristotle.net Subject: 600c Mag Fil Date: Thu, 11 Nov 1999 13:21:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, We have a 600 c #64 running Ver 5.4 which has been extremely stable for ages. 2 days ago on run up in the morning had trubs with yield faults. reset led's all stable did o/p + ratio checks all in spec. Later on in the day yield faults again had to readjust led's back. On further investigations found that when looking at analogue meters for mag fil in service mode found that step 1 was not being initiated till 200 rep rate and with 250 still getting approx 5 v (fluctuating) shown. I f step 1 & 2 done with switches all ok. Had a couple of other centres with 600' do some checks 1 had similar results though more stable while the other had what we expected step 1 showing 6.5 and step 2 (250 R/R) giving 0 on meters. Mag I plus doserate all ok. Problem not assoc. with gantry position. Have put new maggy" in lots of problems with arcing) but get 0 v at max R/R, though step 1 still not active till 200 R/R Any ideas why the incorrect stepping and reasons for seeing voltage indicated at Max Rep Rate. Unsure how long the mag fil voltage problem has been with us as it is something we do not look at on a regular basis. Jim Wallace The Princess Royal Hospital Hull England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Software updates. Message-ID: <199911111917.NAA23069@ogopogo.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: linac-eng@plato1.aristotle.net Subject: Re: Software updates. Date: Thu, 11 Nov 1999 11:14:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" From: "Thomas McCausland" To: linac-eng@plato1.aristotle.net Date sent: Wed, 10 Nov 1999 21:43:58 -0600 Subject: Re: Software updates. Send reply to: acceltek@flash.net > On my reply regarding software updates (Y2K) and Siemens: Actually I misspoke. The upgrades Siemens installed were Y2K upgrades to the Lantis verification system, not the accelerators themselves. Current Y2K info on Siemens Accelerators and fixes can be found at http://www.siemens.de/med/d/y2000/02_9.html Regards to the list Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Type 3 Accessories Message-ID: <00007952.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net Subject: Varian Type 3 Accessories Date: Thu, 11 Nov 1999 09:28:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I was recently doing a repair on the interface mount and made a mistake that I thought I would share so that no one else repeats it. After removing the cover over the POD pcb and interconnect pcb, make sure that the ribbon cable at J24/J5 is not folded over U1. The cover presses the ribbon cable against the IC and the heat that builds up in the IC is not able to dissipate. Result: crispy chips... If this does happen and you don't have the IC in spares, not to worry. Pull the IC out and place jumper from pin 8 to pin 12. This will keep the HWSTATUS high allowing the ACCY interlock to clear. This will not interfere with the various switches in the accessory system to show a fault condition since U7 on the POD pcb requires all the switches to be in their normal operating condition in order for the photoswitch to properly read a wedge code (or a 33 code in the absence of a wedge.) Good Luck! Kerry Price Lutheran General Hospital Park Ridge, Illinois USA ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: thousand apologies Message-ID: <0000783B.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: Eric Westzaan , linac-eng@plato1.aristotle.net, tcullen@wfubmc.edu Subject: Re: thousand apologies Date: Thu, 11 Nov 1999 09:09:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" IMHO... The point Eric is making is that there are those who were willing to rush to judgment based on assumptions, and state their opinions without first knowing the facts... We certainly wouldn't want to let the facts get in the way... What's wrong with an apology if one is owed? "Corporate feelings" are not the point, but rather individual integrity. Yours and mine. Period. If you write something offensive on the list and later rethink it, then a public apology on the list is fine. I think a little humility from those that were quick to weigh in on Paul's decision to apologize is in order. Dissenting opinions and comments are welcome. Regards, Kerry Price ______________________________ Reply Separator _________________________________ Subject: Re: thousand apologies Author: tcullen@wfubmc.edu (Tim Cullen) at PO_EXTERNET Date: 11/11/99 7:26 AM Well now there you go.... let's all apologize for something we have said that was a little bit offensive to the vendors. We would not want to hurt their big corporate feelings now would we. This damn thing about apologizing for something you say when you're pissed off about a vendor's attitude or competence has got to stop. period. If after you say something on this list, and you go home and have you a few beers and cool off, you realize you were an asshole for saying those things...hey make it official sit down a write a hard copy letter and send it the vendors home office and say you're sorry, don't post it here. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Reaction to Suggestion Message-ID: <199911111504.QAA06394@chouffe.radth.ruu.nl> From: Niels de Graaff Reply-To: degraaff@radth.med.uu.nl To: linac-eng@plato1.aristotle.net Cc: chwdegra@wxs.nl Subject: Reaction to Suggestion Date: Thu, 11 Nov 1999 07:07:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" From: Stuart.Vessey@gstt.sthames.nhs.uk To: linac-eng@plato1.aristotle.net Subject: Suggestion Date sent: Thu, 11 Nov 1999 13:08:26 -0000 > Given the problems with "hasty" comments and reactions to them, perhaps now > would be a good time to publish a FAQ for the list which also contains a > "Code of Conduct" for subscribers. Initially I see this more about the > mechanics of the list (how to subscribe, purpose of list, guidelines on > postings etc). At a later stage we can perhaps add extra FAQ's based on > specific machines and common "foibles" and faults. > > I am quite willing to write this initial FAQ, and even arrange web hosting > for it. > > Anybody got any thoughts??? > > Stuart > > > Medical Technical Officer > Guys' and St Thomas' NHS Trust > ___________________________________________________ > Any views stated in this email are my own, and are not to be > interpreted as being those of the Trust unless specifically > stated otherwise. > ___________________________________________________ > > > > <> > Hello Stuart! A very good, if not an excellent idea! One thing that drops into my mind is something I sent to the List already a couple of times in the past: start your message by telling what Linac brand you are talking about, Varian/Elekta/Siemens or even Mitsubishi as I read this morning! We are all Elekta freaks here and sometimes when you want to quickly 'scan' incoming messages it is a real puzzle to find out the type of Linac someone is talking about and so if this message is possibly interesting for you: believe it or not: there ARE Linacs made by other vendors you know! And excellent ones btw. (personally, in such a situation I 'scan' the message to see if there is '2000' or '2100' or '600' in the message, if not, then it could be an Elekta-related problem and I can decide to read it..!) I would suggest a more structured way of posing your question/statement or whatever would be wonderful! Suggested sequence: Name your name, Name the Linac brand you have trouble with, Then define your problem, Tell what you did about it, What the results of your attempts were. I know we all tend to express our emotions quite direct, and I think this is a very good thing (afterall we 'techies' are often considered, lets say a 'strange', 'closed', 'introvert' sometimes even 'weird' type of people... the emotions and the commotions of the last two days fortunately show even we do have feelings!!). Therefore this small hint to 'structurize' your emotions/questions on the List which might help to make yourself more understandable for the rest of our community! Niels de Graaff Dept of Radiotherapy Univ. Hosp. Utrecht The Netherlands degraaff@radth.ruu.nl PS. Note I spell List with a capital 'L'! I think it deserves it! N. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: honour Message-ID: <199911111500.QAA06386@chouffe.radth.ruu.nl> From: Eric Westzaan To: tcullen@wfubmc.edu, linac-eng@plato1.aristotle.net Subject: honour Date: Thu, 11 Nov 1999 07:03:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" According to me your last e-mail does honour to you Tim. Moral Crusader ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Cable Fractures in Rotation Elekta SL15 Message-ID: <4.1.19991111225013.0097ccd0@mail.iinet.net.au> From: Ron Kimber To: linac-eng@plato1.aristotle.net Subject: Cable Fractures in Rotation Elekta SL15 Date: Thu, 11 Nov 1999 07:07:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A short while ago we had a nasty little intermittent on one of the above little beasties. At beam on all would appear okay but HT did not fire up and a PRF EN CHK inhibit was coming up. Beam on again all okay. Once a month, once a week, once a day, you get the picture. PRF EN CHK is the outcome of an interlock chain running right around the whole machine, out to the interface cabinet and computer cabinet and checking most everything. After many many board changes I struck it lucky to find an intermittent in a cable which runs between the beam arm and the connector panel from the cable reeling (SKT44A if I remember). This cable is normally cable tied to the panel but was missed at installation and had been flapping back and forth for about two and a half years before giving trouble. Just a thought, you may like to inspect your own machines for ANY unsecured cables and avoid the problems I had. This cable would not normally be noticed, unless you were specifically looking for it. Happy hunting Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Phone: 61 (0) 8 9381 5655 Mobile: 041 993 7776 Fax:61 (0) 8 9381 4364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Suggestion Message-ID: <99Nov11.145317gmt.14337@firewall1.ccotrust.co.uk> From: Richard Clements To: 'Linac-Eng' Subject: RE: Suggestion Date: Thu, 11 Nov 1999 05:51:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" One thought is that all attachments should be blocked. Many list already do this, but linac-eng clearly doesn't. If subscribers wish to receive attachments they can request them from the individual offering the attachment. This helps stop the spread of viruses and keeps net traffic down. Richard Clements Clatterbridge Centre for Oncology Bebington Wirral Merseyside. CH63 4JY Tel: (+44) 151 334 1155 ext 4168 Fax: (+44) 151 604 7391 > -----Original Message----- > From: Stuart.Vessey@gstt.sthames.nhs.uk > [SMTP:Stuart.Vessey@gstt.sthames.nhs.uk] > Sent: Thursday, November 11, 1999 1:08 PM > To: linac-eng@plato1.aristotle.net > Subject: Suggestion > > Given the problems with "hasty" comments and reactions to them, perhaps > now > would be a good time to publish a FAQ for the list which also contains a > "Code of Conduct" for subscribers. Initially I see this more about the > mechanics of the list (how to subscribe, purpose of list, guidelines on > postings etc). At a later stage we can perhaps add extra FAQ's based on > specific machines and common "foibles" and faults. > > I am quite willing to write this initial FAQ, and even arrange web hosting > for it. > > Anybody got any thoughts??? > > Stuart > > > Medical Technical Officer > Guys' and St Thomas' NHS Trust > ___________________________________________________ > Any views stated in this email are my own, and are not to be > interpreted as being those of the Trust unless specifically > stated otherwise. > ___________________________________________________ > > > > <> << File: Vessey Stuart.vcf >> ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: thousand apologies Message-ID: <382AC401.D256A48E@wfubmc.edu> From: tcullen@wfubmc.edu To: Eric Westzaan , linac-eng@plato1.aristotle.net Subject: Re: thousand apologies Date: Thu, 11 Nov 1999 05:26:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Well now there you go.... let's all apologize for something we have said that was a little bit offensive to the vendors. We would not want to hurt their big corporate feelings now would we. This damn thing about apologizing for something you say when you're pissed off about a vendor's attitude or competence has got to stop. period. If after you say something on this list, and you go home and have you a few beers and cool off, you realize you were an asshole for saying those things...hey make it official sit down a write a hard copy letter and send it the vendors home office and say you're sorry, don't post it here. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Comparisons of Linacs Message-ID: From: "Kloster, Stephen" To: "@plato1 (E-mail)" Subject: RE: Comparisons of Linacs Date: Thu, 11 Nov 1999 05:11:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mark Wanlass wrote: >I have also taken a couple of Varian classes. I felt at the time >that they could have been better. I also believe that when >I took the courses, Varian had separate classes for it's own >service engineers which I suspected may have included more >service information than was supplied in the customer courses. >I haven't looked at any Varian courses recently, however. I have been told by the instructors at the Varian training facility that the sole reason that Varian employees have seperate classes of longer duration than the customers is to allow class time for the extensive testing which is required of employees but not of customers. Regards, Steve "I don't know, but I've been told" Kloster Electronics Technologist Kingston Regional Cancer Centre Kingston, Ontario Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Suggestion Message-ID: <4510ED9293BFD1119D280008C7280D620283BBD8@ex1.gstt.sthames.nhs.uk> From: Stuart.Vessey@gstt.sthames.nhs.uk To: linac-eng@plato1.aristotle.net Subject: Suggestion Date: Thu, 11 Nov 1999 05:08:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Given the problems with "hasty" comments and reactions to them, perhaps now would be a good time to publish a FAQ for the list which also contains a "Code of Conduct" for subscribers. Initially I see this more about the mechanics of the list (how to subscribe, purpose of list, guidelines on postings etc). At a later stage we can perhaps add extra FAQ's based on specific machines and common "foibles" and faults. I am quite willing to write this initial FAQ, and even arrange web hosting for it. Anybody got any thoughts??? Stuart Medical Technical Officer Guys' and St Thomas' NHS Trust ___________________________________________________ Any views stated in this email are my own, and are not to be interpreted as being those of the Trust unless specifically stated otherwise. ___________________________________________________ <> ------_=_NextPart_002_01C19966.172FB140 Content-Type: application/octet-stream; name="Vessey Stuart.vcf" Content-Disposition: attachment; filename="Vessey Stuart.vcf" BEGIN:VCARD VERSION:2.1 N:Vessey;Stuart;Edward;Mr. FN:Stuart Edward Vessey ORG:Medical Physics Dept, Guys and St Thomas' NHS Trust;Medical Physics TITLE:Medical Technical Officer TEL;WORK;VOICE:+44 0207 928 9292 x3916 TEL;WORK;FAX:+44 0207 922 8279 ADR;WORK;ENCODING=QUOTED-PRINTABLE:;Electronics (RT) Workshop;Lower Ground Floor, Lambeth Wing=0D=0ASt Thomas' = Hospital=0D=0ALambeth Palace Road;London;;SE1 7EH;United Kingdom LABEL;WORK;ENCODING=QUOTED-PRINTABLE:Electronics (RT) Workshop=0D=0ALower Ground Floor, Lambeth Wing=0D=0ASt Thom= as' Hospital=0D=0ALambeth Palace Road=0D=0ALondon SE1 7EH=0D=0AUnited Kingdo= m EMAIL;PREF;INTERNET:Stuart.Vessey@gstt.sthames.nhs.uk REV:19990928T092628Z END:VCARD ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Manufacturer's comments. Message-ID: From: Craig Pearce To: 'Dave Pinchin' Cc: 'linac eng' Subject: RE: Manufacturer's comments. Date: Wed, 10 Nov 1999 19:18:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" " I have been contacted offline by one manufacturer over a posting. But in my case it was to offer advise on a fix. " [Craig Pearce] I have been contacted several times from one manufacture due to comments I have made in this forum. On all occasions this as proved to be beneficial to both parties. I talk to this manufactures rep as required for assistance but sometimes you need to hear the collective view. The K1 contactor for example has come up in posting recently. Last night I found that we had a problem with ours and we will replace it. An input line appears not to have been toughed enough on assembly and has heated the contact at the connection point, thus the contact surface inside is most likely damaged. The copper deposit, black soot and the discoloration were all a give away. We also found out that K2 is a resetable contactor, if only I had known that several hours earlier! I for one enjoy the discussion as I have learnt quite a few things. Some of the problems that are discussed which people have seen, I have not. But should they happen I will not be as surprised. Everyone keep up the posting. For Paul who started all this off, John as returned to as safety and he sends his regards. Craig Pearce Technical Officer Medical Physics and Clinical Engineering Auckland Healthcare Services Ltd Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: thousand apologies Message-ID: <199911111149.MAA05878@chouffe.radth.ruu.nl> From: Eric Westzaan To: linac-eng@plato1.aristotle.net Subject: thousand apologies Date: Thu, 11 Nov 1999 03:52:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To whom it may concern I am waiting and ready to read another 35 messages. This time about apologies to Varian. Well done Paul. Your sincerely, Mocking-bird-Eric ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Apology Message-ID: <199911111033.EAA09320@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: Apology Date: Thu, 11 Nov 1999 02:22:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have not had the strong arm applied to me. What I said about Varian was unfair and incorrect and I felt an apology was in order. I stand by my apology and I am sorry if that offends anyone. I did not actually intend for my mail to go on the linaceng list - it was a mistake. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England The contents of this mail are the opinions of myself and not that of the Trust of other individuals. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Relays for Mitsubishi. Message-ID: <4.1.19991111160047.00967cc0@mail.iinet.net.au> From: Ron Kimber To: Linac Engineers Subject: Relays for Mitsubishi. Date: Thu, 11 Nov 1999 00:20:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all I realise this is probably a long shot but otherwise I don't know where to turn. We have a little Mitsubishi ML4 (4MV) which is starting to age and we are getting some funny switch offs and terminations which I am sure is due to relay problems. We have no proper representation for Mitsubishi linacs in this country (our is the only one). But I think there are a few Mitsubishies in USA. Has anyone a source for Mitsubishi parts or know of a supplier for the relay type below. Manufacturer unknown (Japanese) type AE3313 Used on Circuit Board RA209315 Power Driver PCB. I think these are 24V DC 2PCO but they have an unusual pinout so don't have a direct drop in replacement I can source from Farnell or RS. Maybe I will have to make an adapter. There are 36 of these relays on this board. (Thousands of different relays in the unit) Thanks for at least reading this I will be surprised to find a source but fingers crossed. Best regards to you all. Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Mobile: 041 993 7776 Fax:61 (0) 8 93814364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Software updates. Message-ID: <199911110346.VAA03303@bunyip.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: linac-eng@plato1.aristotle.net Subject: Re: Software updates. Date: Wed, 10 Nov 1999 19:43:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Date sent: Wed, 10 Nov 1999 22:22:58 +0800 To: linac-eng@plato1.aristotle.net From: Ron Kimber Subject: Software updates. > Heres a little positive feedback for you all. > > We have just recently upgraded the software on our ELEKTA SL linacs to > level 3.1 which gives us Y2K compliance. > > This upgrade was supplied FREE OF CHARGE to us although we do not have a > service contract with Elekta. I believe ELEKTA supplied all their clients > with the upgrade FOR FREE. > > Can any other linac manufacture lay claim to that level of support for > their product. > > I believe from what I have heard (of course unsubstantiated) none can. > Please correct me if I am wrong. > > Siemens supplyed and installed their latest software upgrade (Y2K and other enhancements) to all their customers also, regardless of service vendor. They upgraded 3 machines for customers we do service for, and I must say, did a fine, professional job. Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Proprietary information Message-ID: <000951210631D311B91A00A0C9DED0B867AC48@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato1.aristotle.net'" Subject: Proprietary information Date: Wed, 10 Nov 1999 20:08:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mark Wanlass wrote regarding my comments on the issue of proprietary information. I must agree that signatures to "confidentiality" agreements cannot under law be broken without possible consequences, but what is a confidentiality agreement and why are people required to sign one ? Maybe manufacturers, are justifiably concerned over how their information is used after all return on investment is what business is all about. However, even after having signed such an agreement I have encountered considerable resistance to the supply of setup/calibration information on fundamental system units. Perhaps in this instance the manufacturers responsibility to the community are being overidden by business priorities. Should information necessary to "appropriately" maintain clinical equipment for use in the community be subject to a "commercial in confidence" clause. Should not the manufacturer expect information that they make available to others be used in the manner intended and by competent individuals. Most professional associations seek a contract with the community in which they operate. In return for autonomy in operation these associations places the health and safety of the community above all other interests. Perhaps a solution to some of the problems (on both sides of the fence) in this "industry" is to establish a professional association with ethics that requires members to comply with a set of industry "ethics". After all, who wants to destroy an industry that they currently earn a living from. Peter Caunt Canberra Australia. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Comments on manufacturers. Message-ID: <382A1858.2CF4D858@reyes.stanford.edu> From: Mark Wanlass To: "'linac-eng@plato1.aristotle.net'" Subject: Re: Comments on manufacturers. Date: Wed, 10 Nov 1999 17:14:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" "Caunt, Peter" wrote: > > > Why not include ongoing access to manufacturers service/support information > in equipment tenders. We already do include such language in our "Request for Proposal" documents. > > > Argue the economics/operational benefits of such comprehensive equipment > data with management at your facility - establish a professional association > and distribute information freely within this domain. > We do have to be careful, however, about any proprietary information that we may be privy to. Information that we figure out on our own should be sharable, though. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Comments on manufacturers. Message-ID: <000951210631D311B91A00A0C9DED0B867AC47@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato1.aristotle.net'" Subject: Comments on manufacturers. Date: Wed, 10 Nov 1999 17:48:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Having shared similiar concerns on manufacturers actions I would like to share my personal opinions. (1) Regarding comments on this list ; The old adage of not committing anything to paper that you would not like to read on the front page of the local news paper equally applies here. This list is an excellent communications medium but in this age of legalistic arguement expect all comments (especially the effective ones) to be considered in a legal sense. Obvious factual information that can be readily substanciated makes an opposing legal case difficult and perhaps unwise to commence. However, I believe all subscribers should identify themselves to this list and be willing to substanciate all comments made. (2) Limiting those who suscribers to this list; Today, very little e-mail is confidential, yet the author is readily identified. As employers are increasingly monitoring e-mail correspondance and the confidentiality of individual subscribers cannot be guaranteed. I believe little benefit is to be obtained from the process of limiting suscribers. (3) Manufacturers confidential information; I remember some years ago when, in this industry, sales were king and service/support were considered "necessary liabilities" Nowadays service/support is a BUSINESS. Manufacturers who compete in this market use "information" as an edge and I seriously doubt that they will be encouraged to contribute formally to this list. However, I believe that as service/support is integral to the life cycle of all radiation equipment, then the owner of the equipment should not be disadvantaged either economically or operationally by the manufacturer when chosing alternate (non OEM) service/support arrangements, a point that may be considered in other forums. Do we want the industry to change ? then change it ourselves. One theory on societal change considers that all change stems from the concerted actions of groups of individuals. Why not include ongoing access to manufacturers service/support information in equipment tenders. Argue the economics/operational benefits of such comprehensive equipment data with management at your facility - establish a professional association and distribute information freely within this domain. Today, we have the tools - why not start now ? Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Comparisons of Linacs Message-ID: <3829F4D5.814DC9AF@reyes.stanford.edu> From: Mark Wanlass To: "@plato1 (E-mail)" Subject: Re: Comparisons of Linacs Date: Wed, 10 Nov 1999 14:42:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tom Bush wrote: > Does anyone out there have a list of performance or service advantages of > the latest Siemens and/or Philips Linacs with regard to the current varian > offerings? Any information on the positive aspects of these "other" Linacs > would be appreciated. Also, does anyone have first hand knowledge on the > availability of technical maintenance training for the in-house engineer > on these products. > Well, I can make a few comments about training. In the past several years, I have attended training courses at Varian, Philips, and Picker (for the AcQsim). The Picker course was the best -- 5 weeks long and very comprehensive. I was in the same class along with the Picker engineers and got all the same service information they did. I only mention this class (since it doesn't directly have anything to do with accelerators) because I think that it set a good example of what a service school can be. (However, I understand that the school has been restructured since I attended -- don't know what it's like now). The Philips SL series course at the time I took it was 6 weeks long and pretty comprehensive. Again, I was in the same class and got the same information that the Philips engineers did. I have also taken a couple of Varian classes. I felt at the time that they could have been better. I also believe that when I took the courses, Varian had separate classes for it's own service engineers which I suspected may have included more service information than was supplied in the customer courses. I haven't looked at any Varian courses recently, however. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Comparisons of Linacs Message-ID: From: busht@shmc.org To: "@plato1 (E-mail)" Subject: Comparisons of Linacs Date: Wed, 10 Nov 1999 13:52:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone out there have a list of performance or service advantages of the latest Siemens and/or Philips Linacs with regard to the current varian offerings? Any information on the positive aspects of these "other" Linacs would be appreciated. Also, does anyone have first hand knowledge on the availability of technical maintenance training for the in-house engineer on these products. Regards, Tom Bush ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Manufacturer's comments. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Manufacturer's comments. Date: Wed, 10 Nov 1999 13:11:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" These views are mine alone, they do not represent those of my employer, they may not even be soundly based in fact, but here they are anyway. While supporting the 'free speech' ideals whole heartedly, we must remember that sometimes we all have 'bad hair days' (I don't because all mine has been torn out for some time now). On a text only media the body language is lost. I do agree also that threats of legal action are way out of line........ We are a Varian site and I would hate to see them or Seimens etc excluded from this list. Rather I would like them to be more active. I am sure that there are a lot of mods suggestions etc which could come from us at the coal face which would benefit averyone. An open forum should be practiced. The benefits to reliablilty, safety, ease of use, serviceability etc would enhance any manufacturer's reputation. There are difficulties with some information being propriety. But we are all mature adults here. I have been contacted offline by one manufacturer over a posting. But in my case it was to offer advise on a fix. The free speech ideal should not extend to advertising (what about new cencepts or products?????????) but it should allow for a call of 'foul' for any transgressions.This may mean that some system of refereeing will be required. Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology Message-ID: <3829C74A.E7551826@scf.sk.ca> From: S Thiesson To: Mark Wanlass Cc: Henk van der Gugten , "Linac Engineers (E-mail)" Subject: Re: Apology Date: Wed, 10 Nov 1999 11:28:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I agree completely with you Mark. Just because the majority of the 'complaints' regard one manufacturer doesn't point to a bad product. It merely indicates that indeed, the majority of sites around the world use that particular product. If we keep our comments factual and helpful, everybody wins. If the manufacturers listen constructively, well.... that is another matter. If we hide things on a private list, everybody loses. Scot Thiesson Sr. physics tech. ABCC Regina Sask. Canada Mark Wanlass wrote: > Henk van der Gugten wrote: > > > [stuff snipped} > > > > If making this list private is the way to keep lawsuits from our doorstep we > > should do that. > > As a practical matter, how can you make the list private? There > are at least 300 subscribers, some of whom work for the > accelerator manufacturers, but who use their own private email > addresses to subscribe to the list. You can bet that anything said > on the list will get back to the manufacturers whether the list is > "private" or not. > > Ideally, we should submit our comments to the list in a professional > manner and the manufacturers should respond likewise. If > comments are made in a professional manner that reflect badly on > a particular company, then too bad -- the manufacturer will have to > deal with the issues. > > However, resorting to name calling type of commentary is not likely to > improve anything for anybody. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology Message-ID: <0000640E.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: 'Linac-Eng' , Richard Clements Subject: Re: Apology Date: Wed, 10 Nov 1999 13:02:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all of esteemed colleagues: I think before we continue to comment on this situation it would be wise to find out why Paul felt the necessity to retract his statements and offer an apology to Varian. It seems to be an assumption that Varian has used some sort of "strong arm" tactic on Paul. I see no indication or evidence from Paul's statements that this is so. I would never defend a company (or an individual) willing to stoop to a level of suppressing free speech, or the free exchange of information or ideas, and I'm not defending Varian. In order to be objective about this and implement a measure of fairness to both Varian and Paul we should know all of the facts before making any comments. Remember, there are two sides to every story and somewhere in the middle lies the truth... Paul, would you care to share with us? Kerry Price ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology Message-ID: <3829BEF0.DF3B6992@reyes.stanford.edu> From: Mark Wanlass To: Henk van der Gugten , "Linac Engineers (E-mail)" Subject: Re: Apology Date: Wed, 10 Nov 1999 10:52:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Henk van der Gugten wrote: > [stuff snipped} > > If making this list private is the way to keep lawsuits from our doorstep we > should do that. As a practical matter, how can you make the list private? There are at least 300 subscribers, some of whom work for the accelerator manufacturers, but who use their own private email addresses to subscribe to the list. You can bet that anything said on the list will get back to the manufacturers whether the list is "private" or not. Ideally, we should submit our comments to the list in a professional manner and the manufacturers should respond likewise. If comments are made in a professional manner that reflect badly on a particular company, then too bad -- the manufacturer will have to deal with the issues. However, resorting to name calling type of commentary is not likely to improve anything for anybody. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology To Varian Message-ID: <008501bf2ba7$18ff98c0$5a2257c0@henkvdg-PC.rt.nki.nl> From: Henk van der Gugten Reply-To: Henk van der Gugten To: Paul Twyman , linac-eng@plato1.aristotle.net Subject: Re: Apology To Varian Date: Wed, 10 Nov 1999 10:11:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To Tom, Paul, the list owner and everybody of good will on this list, Yes, it looks like it that somebody prefers policing reports and complaints about persistant problems to investing in better performance and reliability. I feel sorry for you Paul, that this for the moment is coming back to you. In my memory this is the second or third time that somebody on the list feels compelled to withdraw an earlier frank statement. I recall that at least on one earlier occasion the person concerned wrote that it was because of legal threats by the supplier. Suppose that this is also the case in Pauls' situation, then this said supplier can now be sure that he has a rather silly reputation with all those engineers and fysicists that take part in this list world wide. I for my part will certainly adress this harrassment of an honest messanger in future contacts with the supplier. The critical remarks that fired this thread were not really new or surprising. News and gossip travels fast today, and in local, regional and world meetings there is a lively practice of exchanging and commenting on them, not the least in the circles of those in charge of purchase decisicions. And we should not forget that in the heat of looking for sales arguments it are often the salespeople who spread gossip that intends to harm the competitors credebility. I find it shamefull that somebody from the workfloor appears to be nailed for a frank statement. Companies should be happy to be able to pick up such signals in a list like ours, and use it to their benefit, that is to be able to correct flaws in their system in the earliest possible stage before it becomes an embarrasment to them, like this is now. If making this list private is the way to keep lawsuits from our doorstep we should do that. But this affair than becomes threatening and besides it seems futile. Also information from a private list could come to the attention of a supplier and it is always possible for to try influence a single person. No, the only way to discourage this could be that we act as a loyal group of colleagues. The person(s) that find themselves harrassed should say so to the list, as is automatically so when they publish their "spontanuous" apologies, and they should indicate in it whether it was indeed the commercial partner that asked them to do so. Each of us can than use the appropriate channels to demonstrate that we stand firm against this malpractice, and that it means loss of credibility for the company involved. Everybody that like me feels offended by this thing, let us not sit and wait but make it quite clear that this is unacceptable. Regards to you all, Henk _______________________________________________________________ Henk W. van der Gugten Technical Specialist Radiotherapy Netherlands Cancer Institute / Antoni van Leeuwenhoek hospital Plesmanlaan 121 voice : xx31.(0)20.512.2116 1066 CX Amsterdam fax : xx31.(0)20.669.1101 the Netherlands email : gugten@nki.nl | ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology Message-ID: <3829B739.B0C7C580@earthlink.com> From: "Scott A. King" To: linac-eng@plato1.aristotle.net Subject: Re: Apology Date: Wed, 10 Nov 1999 10:19:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just for the record, I have seen some responses from engineers at Siemens whom I know. They don't announce that they work for the company, maybe Siemens would not like them doing this. The engineers for the most part are just like you and me, but in the corporate setting they have to be careful what they do. I am a third party and have no ties with any manufactures. I feel that if a company wants to promote their product they should work with the in-house and independent contractors, because remember your name is on that product. That is what the customer is going to remember, not who serviced it when it comes time to purchase a new one. Scott A. King ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Apology Message-ID: <199911101700.LAA11606@plato1.aristotle.net> From: "Patnaude, Peter" To: "Linac Engineers (E-mail)" , "Feuerstake, Tom" Subject: RE: Apology Date: Wed, 10 Nov 1999 08:52:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I think that a private channel where anything can be said is the way to go. It could be set up on MIRC software that could be used for chat or postings. From: Feuerstake, Tom To: Linac Engineers (E-mail) Subject: RE: Apology Date: Wednesday, November 10, 1999 9:55AM Perhaps, if this continues, we should consider making this a private list and not allowing the manufactures to view it. As far as I see, they're not contributing to the discussions anyway, and the idea of being policed or muzzled by these guys certainly doesn't appeal to me. In fact, it could kill the list. What do you think, list administrator? Tom Feuerstake PMH Toronto ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Apology Message-ID: <99Nov10.183817gmt.14338@firewall1.ccotrust.co.uk> From: Richard Clements To: 'Linac-Eng' Subject: RE: Apology Date: Wed, 10 Nov 1999 09:36:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I agree with the comments on this subject. If manufacturers were posting adverts they would be banned. Surely a similar punishment should be given to those who threaten and intimidate contributors. It certainly does more harm to their reputation to witness such treatment of their customers than to read the occasional gripe. I had forgotten what the original content was until the apology arrived. It will stick in my mind for a while now. Somewhat of an own goal. Manufacturers should concentrate on satisfying their customers, not bulling them. These are of course my own personal comments and not those of my employer. Richard Clements ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology Message-ID: <38299F9B.811818C2@reyes.stanford.edu> From: Mark Wanlass To: "Linac Engineers (E-mail)" Subject: Re: Apology Date: Wed, 10 Nov 1999 08:38:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" "Feuerstake, Tom" wrote: > Perhaps, if this continues, we should consider making this a private list > and not allowing the manufactures to view it. As far as I see, they're not > contributing to the discussions anyway, and the idea of being policed or > muzzled by these guys certainly doesn't appeal to me. In fact, it could kill > the list. What do you think, list administrator? I'm not sure that making the list private would be the best solution to the problem. Perhaps the best way to avoid creating even more problems when sharing a unhappy experience with a manufacturer would be to simply stick to the facts in a particular case. For example, rather than saying something like "manufacturer X sucks because they can't fix their own equipment in a reasonable time," it would probably be better to give a brief description of the problem, the amount of time it has been allowed to go on, the number of service calls required, etc., and let the facts speak for themselves. It's probably also okay to say that the experience has been particularly frustrating or whatever else the case may be, so long as the content is limited to a factual description of what has occurred (i.e. staff members were actually "particularly frustrated," in the above example). After all, as far as I know, simply telling the truth does not constitute libel. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Apology Message-ID: <002401bf2bae$05bc65c0$790110ac@RPC021.abcc_domain> From: Peter Dickof To: "Feuerstake, Tom" , "Linac Engineers (E-mail)" Subject: Re: Apology Date: Wed, 10 Nov 1999 11:01:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tom Feuerstake said >Perhaps, if this continues, we should consider making this a private list >and not allowing the manufactures to view it. I disagree. >as far as I see, they're not contributing to the discussions anyway, That is my impression also and, like Sherlock Holme's dog that didn't bark, it is a crucial piece of information. > ... being policed or muzzled by these guys certainly doesn't appeal to me. If muzzling is going on, that is something worth knowing. I am currently subscribed to another list where similar events have occurred. A number of individuals complained loudly and bitterly about poor support. Other individuals said that service was a problem but the product was great. Yet others said there was no problem at all. A week or two later, a senior manager from the company in question wrote to the list and said 1) yes there were support problems in specific areas affecting certain kinds of users (and not others) and stated why they had occurred, 2) apologized for same, and 3) specified actions which the company was taking to rectify the problem (including some suggested by the group) I do not own the product in question. I am subscribed to that list precisely to see what the users think and where the problems lie. I was impressed. All companies have problems - the problems which can cause you the most grief are management problems (because they create and/or compound all the others). I have deduced that the company in question is pretty well managed. On another list I belong to the manufacturer routinely provides technical advice. Again, I am impressed. When we make purchase decisions, support is a very important consideration, but it can often be difficult to evaluate. This list provides a forum in which manufacturers can demonstrate their dedication to customer support. I suggest that we encourage all manufacturers to show their true colours on this list as often and as clearly as possible. Peter ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Open letter to Varian Message-ID: <19991110161342.95719.qmail@hotmail.com> From: will smith To: linac-eng@plato1.aristotle.net Subject: Open letter to Varian Date: Wed, 10 Nov 1999 08:13:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Open Letter To Varian I find your companies interference with correspondents on this list server repugnant, it is quite obvious that you have subscribed to this list and thus regulary monitor it. I find it incredible that while YOUR CUSTOMERS employees (referring to us 'in-house' technicians) battle with problems with equipment designed by you and with which I'm sure in most cases, you have known solutions, and you keep silent. In fact you actually go out of the way to make things difficult for us by interfering with people commenting on this list server, which I might add was created for us 'independents' and not the manufacturers. I am the technical manager (we maintain our own equipment) for a very large group of oncologists and I have a major decision making role in what equipment we buy. Based on what appears to be your companies attitude to third party service providers, you now have little chance in selling equipment to us. Are your petty / threatening comments to us Linac engineers worth losing future business ?. If so, I don't see you making it to far into the next millennium. WORK WITH US, NOT AGAINST US, and then, when our employers consult us about purchasing new units, we can say that maybe Varian is the company to go with. That's not the case at the moment as far as I'm concerned. Will Smith. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Apology Message-ID: <99Nov10.100205est.115665@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: Apology Date: Wed, 10 Nov 1999 06:55:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Perhaps, if this continues, we should consider making this a private list and not allowing the manufactures to view it. As far as I see, they're not contributing to the discussions anyway, and the idea of being policed or muzzled by these guys certainly doesn't appeal to me. In fact, it could kill the list. What do you think, list administrator? Tom Feuerstake PMH Toronto ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Software updates. Message-ID: <4.1.19991110221336.0096e320@mail.iinet.net.au> From: Ron Kimber To: linac-eng@plato1.aristotle.net Subject: Software updates. Date: Wed, 10 Nov 1999 06:22:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Heres a little positive feedback for you all. We have just recently upgraded the software on our ELEKTA SL linacs to level 3.1 which gives us Y2K compliance. This upgrade was supplied FREE OF CHARGE to us although we do not have a service contract with Elekta. I believe ELEKTA supplied all their clients with the upgrade FOR FREE. Can any other linac manufacture lay claim to that level of support for their product. I believe from what I have heard (of course unsubstantiated) none can. Please correct me if I am wrong. Wouldn't it be nice to see more product support on these sorts of issues. Well done ELEKTA. I reserve the right to make critical judgement on other issues which may not be so positive. The opinions expressed in this email are my own and mine alone. I do not represent my employer or any other company or individual. Ron Kimber ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Apology Message-ID: <38297D5A.3D1C4C84@wfubmc.edu> From: tcullen@wfubmc.edu To: Paul Twyman , linac-eng@plato1.aristotle.net Subject: Apology Date: Wed, 10 Nov 1999 06:12:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Paul, I'm guessing the message below is the one you are referring to. What I see is a company founded in the "home of the free" embarrassing all of us. You'd think instead of wasting their time muscling an apology out of an engineer in the basement, they would spend time resolving issues posted on the list. I know they can't respond to the list but they can contact the customer directly....or can they??? Wait a minute....this would require effort, manpower, and cost.... oh my god what about the cost....hmmm. Well like I was saying..... Let's leave the "say what they want to hear" stuff to the politicians. _____ Hi Hobie This all sounds very familiar to scenarios in the UK. Varian service here either don't know, can't find out or aren't there. Still lets hope that Varian get their act together soon for their sake as well as ours. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England Paul Twyman wrote: I recently made some comments on this list that were both unfair and incorrect. I would like to withdraw those comments and apologise for having made them. I also apologise for not having taken the time to think about what I was saying rather than just saying what I think. It was not my intention to offended any of the employees of Varian. In future I will simply view the list and not actually comment on it unless I have something positive to contribute. Paul Twyman. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re:Apology to manufacturers. Message-ID: <4.1.19991110214119.00977100@mail.iinet.net.au> From: Ron Kimber To: linac-eng@plato1.aristotle.net Subject: Re:Apology to manufacturers. Date: Wed, 10 Nov 1999 06:06:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To the list users but also to the list "police". Negative comments about machines equate to one persons opinion or experience, as do positive comments. Forced retraction of those comments equate to -1 points in my next consideration on a linac purchase and I will openly inform my employer of my judgment. All posters to the list by all means consider moderating your comments to keep a balance but do not let this list lose its integrity and right to free speech. Official disclaimer: The opinions expressed in this email are my own and belong to me alone, they are not representative of my employer or any other company or individual. (Is that enough to protect me???? or does it serve to condemn me??? ) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Apology To Varian Message-ID: <75BBAEFDC8E5D2119B83006008CD73D9811E5B@s0000052.smz.magwien.gv.at> From: =?iso-8859-1?Q?B=FCchler_Felix?= To: Paul Twyman , linac-eng@plato1.aristotle.net Subject: RE: Apology To Varian Date: Wed, 10 Nov 1999 03:21:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Paul, hi to all others, due to the messages in the last weeks I have the impression that Varian does a lot of work in watching this list and keeping their lawyers busy instead of trying to immediately solve the focused problems. In fact they are the suppliers and should have an interest to keep their customers satisfied! Or has everybody already a linac and there is no future market??? They would get a real nice image if the participants of this list would be able to answer "You are wrong, all our Varian-machines work pretty well and we never had troubles with the service! That must be an exception!" This is my personal opinion and I hope, that this list stays a place where we can talk without consulting a lawyer before!!!! Regards, felix -----Original Message----- From: Paul Twyman [ mailto:mawm82@ [158.43.128.67]] Sent: Mittwoch, 10. November 1999 11:03 To: linac-eng@plato1.aristotle.net Subject: Apology To Varian I recently made some comments on this list that were both unfair and incorrect. I would like to withdraw those comments and apologise for having made them. I also apologise for not having taken the time to think about what I was saying rather than just saying what I think. It was not my intention to offended any of the employees of Varian. In future I will simply view the list and not actually comment on it unless I have something positive to contribute. Paul Twyman. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Apology To Varian Message-ID: <199911101013.EAA03033@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: Apology To Varian Date: Wed, 10 Nov 1999 02:03:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I recently made some comments on this list that were both unfair and incorrect. I would like to withdraw those comments and apologise for having made them. I also apologise for not having taken the time to think about what I was saying rather than just saying what I think. It was not my intention to offended any of the employees of Varian. In future I will simply view the list and not actually comment on it unless I have something positive to contribute. Paul Twyman. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Used Equipment Message-ID: <003301bf2add$793ad120$0101a8c4@jacksrad> From: Jack Trochessett To: Medical Physicists List , Linac Engineers List Subject: Used Equipment Date: Tue, 9 Nov 1999 10:06:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" 1987 Siemens MDX SN 1735, 4 & 6 Photon beam plus electrons available in 30 days. Contact jasksrad@datasync.com if interested. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: X-ray field a-symmetrical on SL75/5 Message-ID: <99Nov8.194417est.119472@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: X-ray field a-symmetrical on SL75/5 Date: Mon, 8 Nov 1999 16:00:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" There are 2 planes of adjustment that affect the beam as it hits the target/ flattener. One is the absolute position of the beam on the target. The other is the angle of the beam. It is possible to get what looks like a good flatness from a number of geometric combinations of these 2 parameters, but while the beam may be flat, the wrong combination can result in the beam being offset from the central axis. The best way to tell if the beam is at the correct angle and position on the target is to rotate the collimator 180 degrees. If the beam stays in the same offset position it is good evidence that its striking the target at an angle, but positionally offset in such a way that it interacts with the flattener to produce reasonable symmetry. There is a great risk under these circumstances for the Linac engineer to overlook this and assume that the independent jaws need to be re-calibrated. The result would be a beam that looks good, but only at that collimator angle. We should all be checking for this kind of thing regularly, especially with ind. jaws or MLC. On Linacs in general you can assume that the steering coils that are further away from the target (ie. nearer the gun end) will affect the beam position on the target more than the beam angle. The coils near the target affect the angle. There are several ways to try and correct the steering. For example, if there is a steering servo in the a-b plane, leave it on (since its trying to zero the difference on the ion chamber plates) and adjust the coils nearer to the gun end to try and move the beam back in line with the central axis. Keep in mind, you will need to check the position of the beam by rotating the collimator 180 degrees and shooting films. With this adjustment you may eventually encounter problems with doserate and loss of beam output due to steering the beam off. On an older SL25 this problem was solved by adjusting the AFC to recover the doserate. If anyone really wants to know why, I can give you a "hand-waving" argument. Regards, Tom Feuerstake PMH Toronto -----Original Message----- From: Francis Tiss [SMTP:francis@medtech.com.au] Sent: Monday, November 08, 1999 5:51 PM To: linac-eng@plato1.aristotle.net Subject: X-ray field a-symmetrical on SL75/5 Hi folks, We have a Philips Linear Accelerator SL75/5, that has developed a sudden a-symmetry in the transverse (2T) direction only. When the X-ray field is measured on a film, the B-plane is larger then the A-plane by as much as 1.5mm. This does not change with collimator angle, although the effect is more pronounced at 0 degrees and 180 degrees, when the inner jaws are used in the 2T direction. This seems to indicate a shift between the X-ray axis and the collimator centre-of-rotation of 0.7mm, which is also measured by the Wellhofer tank as being the CAX offset. The Mechanical iso-centre of the collimator has been extensively checked, the lightfield has been correctly adjusted, and the flatness of the X-ray beam is near perfect. The flattening filter has been checked for play, but no movement possible? as far as we can determine, the field is symmetrical in the G-T plane (2R). As the collimator rotation does not influence this problem, the problem thus is: How to move the X-ray focal spot in the transverse direction while keeping a flat field. Regards Francis Tiss Medtech Solutions ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: X-ray field a-symmetrical on SL75/5 Message-ID: <01bf2a3b$c6604c20$LocalHost@medtech> From: Francis Tiss To: linac-eng@plato1.aristotle.net Subject: X-ray field a-symmetrical on SL75/5 Date: Mon, 8 Nov 1999 14:51:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi folks, We have a Philips Linear Accelerator SL75/5, that has developed a sudden a-symmetry in the transverse (2T) direction only. When the X-ray field is measured on a film, the B-plane is larger then the A-plane by as much as 1.5mm. This does not change with collimator angle, although the effect is more pronounced at 0 degrees and 180 degrees, when the inner jaws are used in the 2T direction. This seems to indicate a shift between the X-ray axis and the collimator centre-of-rotation of 0.7mm, which is also measured by the Wellhofer tank as being the CAX offset. The Mechanical iso-centre of the collimator has been extensively checked, the lightfield has been correctly adjusted, and the flatness of the X-ray beam is near perfect. The flattening filter has been checked for play, but no movement possible? as far as we can determine, the field is symmetrical in the G-T plane (2R). As the collimator rotation does not influence this problem, the problem thus is: How to move the X-ray focal spot in the transverse direction while keeping a flat field. Regards Francis Tiss Medtech Solutions ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian linacs: V5.4 & gantrywoble -Reply Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Varian linacs: V5.4 & gantrywoble -Reply Date: Mon, 8 Nov 1999 10:58:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had this problem with 600c #248 ( this one had later versions of the aerotech boards). The problem was almost totally eliminated by tweeking the gantry balance and board pots. I also believe there are some numbers in the machine config files which can improve the situation. Your service rep should check this one out with the factory. Good luck Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Varian linacs: V5.4 & gantrywoble Message-ID: <000101bf2a1a$fc29d720$782810ac@eive-nt.centrala.liv.se> From: eive@centrala.liv.se Reply-To: eive.rodestedt@centrala.liv.se To: Linac Mailing List , CJ.de.Bruijne@walcheren.ziekenhuis.nl Subject: SV: Varian linacs: V5.4 & gantrywoble Date: Mon, 8 Nov 1999 10:56:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi I've got exactly the same problem and it has been there for more than 6 months. Our Varian rep has adjusted all things that he can think of. = Since 2 moths he has been investigate the issue with Varian USA but no answer = yet. There is a different in the gantry velocity parameter. 2100C #28 = version 5.2 has FEE0 and 0 2100C #413 version 5.4 has FFCC and 0. There is no problem with the autosetup on my older Clinac with version 5.2 We have = new clutches and PVI on both machines /Eive Rodestedt Central hospital Karlstad Sweden > -----Ursprungligt meddelande----- > Fr=E5n: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]F=F6r > CJ.de.Bruijne@walcheren.ziekenhuis.nl > Skickat: den 8 november 1999 16:32 > Till: linac-eng@plato1.aristotle.net > =C4mne: Varian linacs: V5.4 & gantrywoble > > > g'day linac slaves, > > As many of you we had an update on our linacs (2100C-c2 & 2300CD-c3) > to V5.4. > > V5.4 works fine, but 'they' added some funny things that we don't = like. > The most important one is the change in gantry-rotation steering > during auto-setup. (The machines are connected to Varis) > With V5.2 we never had problems, but now there is an overshoot when > the gantry reaches its position. > This effect is most strong at gantry right up position (0=B0 IEC) - > it starts wobbling and never stops untill you release the MEB's. > (when you see this first you like to tune the gain-pot - but there = is no > pot) > > We spoke to our Varian rep. and they told us to balance the gantry, > check the motor current limmit, and take care for a good chain & = clutch > alignment. > We did this and the problem is almost gone now. > Still V5.2 worked better than V5.4 and the problem tend to come back. > > Do any of you have the same experience, or are we the only one with = this > problem? > > Regards, > > Keesjan de Bruijne > ZRTI, Flushing, the Netherlands. > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian linacs: V5.4 & gantrywoble Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Varian linacs: V5.4 & gantrywoble Date: Mon, 8 Nov 1999 07:32:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable g'day linac slaves, As many of you we had an update on our linacs (2100C-c2 & 2300CD-c3) to V5.4. V5.4 works fine, but 'they' added some funny things that we don't like. The most important one is the change in gantry-rotation steering during auto-setup. (The machines are connected to Varis) With V5.2 we never had problems, but now there is an overshoot when the gantry reaches its position.=20 This effect is most strong at gantry right up position (0=B0 IEC) - it starts wobbling and never stops untill you release the MEB's. (when you see this first you like to tune the gain-pot - but there is = no pot) We spoke to our Varian rep. and they told us to balance the gantry,=20 check the motor current limmit, and take care for a good chain & clutch alignment. We did this and the problem is almost gone now. Still V5.2 worked better than V5.4 and the problem tend to come back. Do any of you have the same experience, or are we the only one with = this=20 problem? Regards, Keesjan de Bruijne ZRTI, Flushing, the Netherlands. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mevasim S Simulator, Moving Wires Message-ID: From: Oktay Ureten To: linac-eng@plato1.aristotle.net Subject: Mevasim S Simulator, Moving Wires Date: Mon, 8 Nov 1999 15:17:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi folks, We have some problems with our Mevasim simulator. One of the problems is that the wires are moving by time. For example, when we set a 10x10 field, it gets narrower slowly with time. We have tried to make adjustments by using potentiometers (R1,R2,R3) located at the analogic board. The gain potentiometer (R1) value and the zero potentiometer (R2) values seem to be correct. We have adjusted the reference potentiometer to its desired value. But it did not help. We have also checked the voltges and they were OK. Do you have any idea about this problem? Oktay Ureten ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 2300C/D HVCB intermittently trips - SOLVED Message-ID: From: "Loeks, Michael" To: "Wilson, Jim" Subject: RE: 2300C/D HVCB intermittently trips - SOLVED Date: Mon, 8 Nov 1999 07:52:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, This is my response to Marty Shapiro of Accelinear. In my opinion, he was off base with his response. (Made me wonder if he used to work for Varian on the design team for the modulator.) Please tell me what you think. I haven't checked for water in the klystron focus solenoid, but I was planning to do so on Friday which is our next IPM date. Thanks, Mike Marty, I respectfully submit the following: 1. The inrush current can't be more than 160Arms with our machine (208Vrms) if the step start resistors are in circuit. 208Vrms/1.3Ohms = 160Arms. 2. It is C1,C2 that are responsible for the inrush current, not the transformer. 3. The only way that the current can be more than 160Arms is if K2 is pulled in, in which case the current will be flowing through K2 as well as K1. The contacts on our K2 relay were excessively pitted. This indicates that the relay is being used in an application that requires it to switch more current than it can reliably handle. The number of problems with K2 reported by others on this list supports this. There is no electronic delay in the coil circuit. K2 is pulled in by K1 so the only delay is the time it takes for the contacts to close. I would wager that K2 is being pulled in before the inrush has subsided. In theory K2 appropriately sized. However, if the normal operating current is 30 amps and K2 is rated for 40 amps then it is derated by 25%. My experience has been that 25% is not enough for a long reliable life. I was not a member of this E-mail list when the lower reliability K2 was discussed. I archive all messages that are pertinent to Varian accelerators so I searched previous messages and didn't find any that discussed changes to K2. Michael Loeks -----Original Message----- From: Accelinear@aol.com [mailto:Accelinear@aol.com] Sent: Friday, November 05, 1999 7:37 PM To: MLoeks@providence.org; linac-eng@plato1.aristotle.net Subject: Re: 2300C/D HVCB intermittently trips - SOLVED Sorry, but your suggestion that K2 is incorrectly sized is wrong. K1 needs to be much higher rated to handle the extremely large inrush current that happens inthe first few milliseconds after beam on. Even with the step-start resistors the current flow may reach over 200amps. Thats one large plate transformer! Afterward the current flow is likely to be less than 30amps. K1 also must be sufficiently sized to survive failures such as a failed K2 relay or blooming main thyratron. These inrush current flows may reach as much as 700 amps. No, K2 is well sized for its use and this has been proven in over 1200 high linacs manufactured by Varian over the years. Recently a lower cost, lower reliability version of this relay has been instituted by Varian but that was covered months ago on this BBS. Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Water Frustration (quick response appreciated) Message-ID: From: Terence Kearey To: woodr@slrmc.org, linac-eng@plato1.aristotle.net Subject: SV: Water Frustration (quick response appreciated) Date: Mon, 8 Nov 1999 02:45:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Robert, Just hope you don't have that which happened here once. The klystron solenoid cooling was leaking. It filled the outer casing = and then proceeded to run into the HV tank under the klystron. It didn't happen fast as yours seems to be doing. I found it on a routine inspection, a tiny drop of water on the rim of = the klystron solenoid. I then drilled a hole in the casing as it didn't = seem to be hollow sounding. The water poured out filling a bucket. When we removed the solenoid and inspected the tank, there was a pool = of water at the bottom, under the oil. I can almost imagine the results if that water had dripped into the = tank a couple of cm nearer the contact plate. we were lucky not to have a = major disaster. I wouldn't hurt to rule out this possibilty by drilling a hole in the klystron solenoid casing, as low down as you can, just above the fixing plate. The cooling coils are in the upper part, the lower part should = be empty. You must stop the machine. There is a real danger here. In my opinion = the engineer is responsible in this instance when faults could jeopardise patient safety and or could produce such damage to the machine that it could be down for a long time. It's the lesser of two evils. By all means get your physicist to back you up if necessary. Good luck Tel. -----Ursprungligt meddelande----- Fr=E5n: woodr@slrmc.org [SMTP:woodr@slrmc.org] Skickat: den 5 november 1999 17:47 Till: linac-eng@plato1.aristotle.net =C4mne: Water Frustration (quick response appreciated) Yesterday one or our techs added about "a gallon" of water to our = Varian 2100C. I looked around and could find no leaks. This morning he = informed me that he added about 5 liters. Now I am really concerned and of = course the machine is running so I can't get to it. I am setting here = frustrated over the fact that I am afraid I have a major problem but I can't get = the machine to check it out. Anyway I checked the mechanical water diagram and it is scary what = could be a possible problem. However the obvious things aren't the problem. No water joints, the pit is dry, all the hose connections are fine. We = are still up and running (bet that won't stay that way long). Anyway I am asking for some fast and clean checks that I might look at between = patients and at lunch. There really aren't that many components involved and I = would think that most of the would display a major fault it they were leaking internally. Got any ideas! Robert Wood MSTI Boise, Id ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2300C/D HVCB intermittently trips - SOLVED Message-ID: <0.5190d347.2554fc51@aol.com> From: Accelinear@aol.com To: "Loeks, Michael" , linac-eng@plato1.aristotle.net Subject: Re: 2300C/D HVCB intermittently trips - SOLVED Date: Fri, 5 Nov 1999 19:36:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry, but your suggestion that K2 is incorrectly sized is wrong. K1 needs to be much higher rated to handle the extremely large inrush current that happens inthe first few milliseconds after beam on. Even with the step-start resistors the current flow may reach over 200amps. Thats one large plate transformer! Afterward the current flow is likely to be less than 30amps. K1 also must be sufficiently sized to survive failures such as a failed K2 relay or blooming main thyratron. These inrush current flows may reach as much as 700 amps. No, K2 is well sized for its use and this has been proven in over 1200 high linacs manufactured by Varian over the years. Recently a lower cost, lower reliability version of this relay has been instituted by Varian but that was covered months ago on this BBS. Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Water Frustration Message-ID: From: Randy Wick To: 'Linac-eng list' Subject: RE: Water Frustration Date: Fri, 5 Nov 1999 14:25:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have had a couple of heat exchangers leak, with the same symptoms. You might also want to check the pH and conductivity of your water to make sure you're not getting excessive corrosion. > -----Original Message----- > From: Robert Wood [SMTP:woodr@slrmc.org] > Sent: Friday, November 05, 1999 7:44 AM > To: Linac-eng@plato1.aristotle.net; busht@shmc.org > Subject: Water Frustration > > This is a copy of an earlier message. > However I sometimes have trouble posting to the list so I am doing this > two different ways. > > Yesterday one or our techs added about "a gallon" of water to our Varian > 2100C. I looked around and could find no leaks. This morning he informed > me that he added about 5 liters. .... ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2300C/D HVCB intermittently trips - SOLVED Message-ID: From: "Loeks, Michael" To: "'linac-eng@plato.aristotle.net'" Subject: 2300C/D HVCB intermittently trips - SOLVED Date: Fri, 5 Nov 1999 14:40:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, With some advice (David Rodriguez had the suggestion that was the closest to the actual problem) I was able to track down the problem. The low line voltage had the potential to be a problem, but it was not THE problem. The 24V UVR holds this breaker on and goes through an set of auxiliary contacts (a microswitch) on the side of K2 . The contacts were intermittent. I replaced the switch and the machine has been fine ever since. The main contacts don't look very healthy so I will be replacing the contactor at the next opportunity. Thanks for the help!! It seems odd to me that Varian used a huge contactor for K1 and a small one for K2 when K2 carries most of the load. K2 is only rated for 40 Amps. I understand that there will be some inrush current that requires K1 to be rated for high current, but the resistors should moderate that somewhat. It seems like K2 should be the same size as K1. Michael Loeks Clinical Engineering Technician Providence Portland Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Frustration (quick response appreciated) Message-ID: <199911052050.OAA20475@plato1.aristotle.net> From: JIM WALLACE Reply-To: JIM@gloria.force9.co.uk To: Virago1100@aol.com, linac-eng@plato1.aristotle.net Subject: Re: Water Frustration (quick response appreciated) Date: Fri, 5 Nov 1999 12:32:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Robert, My bet is the heat exchanger. If you have a chiller in the external supply chances are that it will have overflowed. Or if you switch the Lin Acc off it will overflow from the internal water tank!. Jim Wallace The Princess Royal Hospital Hull England. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Frustration (quick response appreciated) Message-ID: <0.87f2d8d9.25546f1e@aol.com> From: Virago1100@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Water Frustration (quick response appreciated) Date: Fri, 5 Nov 1999 09:34:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Robert, Two items come to my mind..... First is the heat exchanger, if the city side of the heat exchanger has a lower pressure than the closed loop side, it is possible for water to leak from closed loop side and down the drain. This is probably less likely if you have a chiller or closed loop on the city side. The second thought you are not going to like..... In recent years when I have seen water leaks that are not the obvious, it generally ends up being the klystron focus coil :-( This has been a pretty common problem in the last 5-8 years, they don't seem to last like they used to! With the older focus coils one could pull up the thin piece of fiberglass in the channel on the top rear of the coil and look down along the inside wall. That can't be done on the newer focus coils because of a change in design... As a matter of habit, we have been drilling a weep hole in the focus coils so that an internal water leak will be obvious before it gets too bad. I drill an 1/8 or 3/16" hole about 2 1/2 or 3" up from the bottom of the focus coil (as measured from the top plate of the pulse tank that it rests on). The steel wall of the focus coil is about 3/8" to 1/2" thick, use a stop on your bit so that you don't go too far in! There is a gap between the inside wall and the coils (about 3/8 to 1/2" I believe), if you are leery of doing this, you could call Ogalala at 308-284-4740 for confirmation of dimensions and where best to drill. Can't tell you how many times I have found a focus coil with an internal leak! I have seen many machines running just fine with the coil full of water (~ 4 gallons). Good luck! Let me know what you find. Jim McKenzie Acceletronics Midatlantic ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Water Frustration (quick response appreciated) Message-ID: <000501bf27aa$49475b40$1e23d3ab@pwserver> From: Steve Schwarz To: woodr@slrmc.org Cc: linac-eng@plato1.aristotle.net Subject: Water Frustration (quick response appreciated) Date: Fri, 5 Nov 1999 08:24:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In a message dated 11/05/1999 9:51:49 AM Central Standard Time, woodr@slrmc.org writes: > Subj: Water Frustration (quick response appreciated) > Date: 11/05/1999 9:51:49 AM Central Standard Time > From: woodr@slrmc.org (Robert Wood) > Sender: owner-linac-eng@plato1.aristotle.net > To: linac-eng@plato1.aristotle.net > > Yesterday one or our techs added about "a gallon" of water to our Varian > 2100C. I looked around and could find no leaks. This morning he informed me > that he added about 5 liters. > Now I am really concerned and of course the machine is running so I can't > get to it. I am setting here frustrated over the fact that I am afraid I > have a major problem but I can't get the machine to check it out. > Anyway I checked the mechanical water diagram and it is scary what could be > a possible problem. However the obvious things aren't the problem. No water > joints, the pit is dry, all the hose connections are fine. We are still up > and running (bet that won't stay that way long). > Anyway I am asking for some fast and clean checks that I might look at > between patients and at lunch. > There really aren't that many components involved and I would think that > most of the would display a major fault it they were leaking internally. > Got any ideas! > > Robert Wood > MSTI > Boise, Id > > Robert, It sounds like your heat exchanger may have a leak. Your internal water pressure is probably greater than the external so your probably leaking system water out to city water which is why you don't see it in the pit or on the floor. Acceletronics sells the heat exchanger, Varian part number 855086-01 for $870.00. The Acceletronics product ID# is 85 6030-00. You can order directly thru the website parts pages, call us at 800-626-8704, fax us at 847-735-8394 or email us at parts@acceletronics.com. We've been updating our online database and have over 1,000 items listed with new pricing. Hope this helps & good Luck, Steve ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <0.64401a3e.2553bb35@aol.com> From: Accelinear@aol.com To: somers@radonc17.ucsf.edu, perhh@radonc.unc.edu, linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Thu, 4 Nov 1999 20:46:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I want to thank all who responed to my inquiry. I have seen the latest windows version in use though most extensively on a Elekta SLi. The techs don't have an Impac inroom monitor though the Elekta does have two monitors that displays much of the same information. They use auto setup extensively too. There really is a lot of info on the Impac work station, and nicely presented in the opinion of the techs who have made comments to me. Still, I can see how having all that data presented in the room may be a bit much. One thing I didn't know was that the Siemens tables don't provide positioning data back to the Lantis. Is that for all machines and tables? Thanks for the info, Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fw: Dual In-Room Monitors Message-ID: <007501bf2744$c0bc79a0$427011ce@medtech-solutio> From: Francis Tiss To: linac-eng@plato1.aristotle.net Subject: Fw: Dual In-Room Monitors Date: Thu, 4 Nov 1999 20:17:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have found a fix for this. In the Windows version of Lantis, right click in the DOS window and select properties, you can then increase the font size this will increase the size of the window Francis Tiss Medtech Solutions Australia -----Original Message----- From: Per H Halvorsen < perhh@radonc.unc.edu > To: Tim Cullen < tcullen@wfubmc.edu >; linac-eng@plato1.aristotle.net < linac-eng@plato1.aristotle.net > Date: Thursday, 4 November 1999 1:28 Subject: Re: Dual In-Room Monitors We use the Windows version of Lantis (badge-engineered IMPAC), and have the same frustration with unreadable fonts on the in-room monitor. We have complained about this, and got the same "recommendation" you describe. We have suggested that they add a second video card in the R&V computer, and drive a differently formatted display for the in-room monitor (rather than just splitting the same signal to two monitors). Your idea has some merit, though.... Per Halvorsen Clinical Physicist Univ North Carolina Chapel Hill, NC Steve, there is a company by the name of Extron Electronics that carries a good selection of video splitting equipment and cables. All of high quality. I am currently using their model RGB 202 xi. We have only one monitor in the room and use the IMPAC R+V system. The therapist can easily switch from the clinac console or R+V screen but rarely do so. They prefer to use the R+V screen most of the time in the room. I just found out a little disturbing info about the IMPAC system though. Their Windows version, when displayed in the room on a 20 inch monitor, is almost impossible to see from more than a meter away and they are recommending a work-around of placing the in-room monitor on a cart or shelf at eye level. I don't think this is what the therapist are looking for and would like to know if anyone is currently using this version and have come up with a better solution. The only thing I can come up with is hanging a larger monitor from the ceiling say 30 inch or so and then I can come in on the weekends and watch the football games on it :-) _____ Steve Cripps wrote: Hi all, I am quite new to this list and would value some information on dual in-room monitors. Does anyone have dual in-room monitors connected to VARiS, and if so, is it just a matter of using a splitter in the treatment room to drive both monitors? If this is the case, what make and/or model have you used or do you suggest? I would appreciate any feedback. Regards, Steve Cripps. Radiation Engineer. Royal Hobart Hospital (W P Holman Clinic) GPO Box 1061L Hobart TAS 7001 Australia Phone: + 61 3 6223 4000 Direct: + 61 3 6222 8618 Fax + 61 3 6234 8036 Mobile: + 61 0408 136 906 E-mail: steve.cripps@dchs.tas.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <4.1.19991104211807.00940c60@radonc17.ucsf.edu> From: John Somers To: Accelinear@aol.com, perhh@radonc.unc.edu, linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Thu, 4 Nov 1999 18:26:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 10:06 PM 11/3/99 -0500, Accelinear@aol.com wrote: >I don't understand all the concern about the size of the in room monitor with >the windows version of Impac. Maybe I'm missing something here but I should >think that all one needs to do is use the auto setup feature and all >positions will be in accordance to the prescription. A few quick checks that >the light field and tatoos align and off they go. No? > > Marty Shapiro Marty, how about first ensuring that the techs have the correct patient on the table. Seriously, the issue as I know it is that the therapists must be able to read the information displayed on the in-room monitor. This is currently a challenge due to the display layout, size and fonts used. Not everyone has or uses full auto setup. And even if they do, the principle is that the therapists will notice if something's awry (not guaranteed, as we know). There are many, many things that can go wrong with setup, including treating the wrong patient or the wrong anatomical part of the correct patient. If an in-room monitor is used at all, it certainly should be readily readable. Otherwise it's just a useless expense and hassle. Regards, John ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <4.1.19991104081827.009d5bb0@apophost.radonc.unc.edu> From: Per H Halvorsen To: Accelinear@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Thu, 4 Nov 1999 05:28:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The therapists like to use the in-room keyboard (we use a cordless version) to bring up the room schedule, and select their next patient. While one therapist walks the patient out of the room, the other therapist calls up the next patient and prepares the immobilization devices. With the new Windows version of IMPAC/Lantis, however, the font size is so small as to be illegible from more than 3 feet away. When the monitor is hung on the wall, that's a real problem. Also, if the therapists want to read SSDs or couch height from the Lantis/IMPAC record (Siemens couches still are not interfaced with Lantis...), that's nearly impossible as well due to the small fonts. So they rely on the paper chart for now. It would not work to simply increase font size or decrease the display resolution, since that means large sections of the windows will not be visible on Siemens' PrimeView interface (it doesn't re-size or scroll...). Any ideas would be welcome. Per Halvorsen Clinical Physicist Univ North Carolina >I don't understand all the concern about the size of the in room monitor with >the windows version of Impac. Maybe I'm missing something here but I should >think that all one needs to do is use the auto setup feature and all >positions will be in accordance to the prescription. A few quick checks that >the light field and tatoos align and off they go. No? > > Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <382189BF.EA9E89@wfubmc.edu> From: tcullen@wfubmc.edu To: linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Thu, 4 Nov 1999 05:27:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Marty, I think the therapist wish it was always that simple. The fact is the setups on patients are more complex than ever with the advent of three dimensional treatments and all the other high precision/accuracy gadgets that we are hanging on the linacs these days. It's frequent they do what you describe and the anatomy still does not cooperate or they have forgotten the wedge angle or whatever. That's when they need to see actuals vs prescribed, the setup notes, and accessories. That's where having to go up to the IMPAC windows ver screen squinting your eyes till you finally focus in at a very close range comes in. _____ Accelinear@aol.com wrote: I don't understand all the concern about the size of the in room monitor with the windows version of Impac. Maybe I'm missing something here but I should think that all one needs to do is use the auto setup feature and all positions will be in accordance to the prescription. A few quick checks that the light field and tatoos align and off they go. No? Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 2100CD Portal Vision Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Varian 2100CD Portal Vision Date: Thu, 4 Nov 1999 04:41:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi folks: Have a Mark 1 PV with type 3 cassette on 2100CD s/n 1025. Can't get an image. 400V is live on the cassette. Of course, not much diagnostics provided. At first, I could see an image come up on the screen, but it would look like a dark field image. Now, I don't have any image at all. When I take a scan, it comes up blank. Any suggestions? Carl Murphy, C.E.T. Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <0.110c947e.25525242@aol.com> From: Accelinear@aol.com To: somers@radonc17.ucsf.edu, perhh@radonc.unc.edu, tcullen@wfubmc.edu, linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Wed, 3 Nov 1999 19:06:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I don't understand all the concern about the size of the in room monitor with the windows version of Impac. Maybe I'm missing something here but I should think that all one needs to do is use the auto setup feature and all positions will be in accordance to the prescription. A few quick checks that the light field and tatoos align and off they go. No? Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: In-room monitor driver Message-ID: From: busht@shmc.org To: "@plato1 (E-mail)" Subject: In-room monitor driver Date: Wed, 3 Nov 1999 15:00:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have been very happy with our Cybex monitor driver system. The big advantage to the Cybex is that it allows the addition of an in-room monitor and in-room keyboard and in-room bar code reader if desired. (Impac friendly). The system consists of a "driver box" and the "remote box" and the 100 ft or 250 ft cable all in one package. Works great lasts a long time. Can be had by calling Cybex at: (256) 430-4000 in Huntsville, Alabama or one of their distributors at Ergonomics Plus at : (253) 942-7557 also 1(800) 526-1953. Any questions happily considered. good luck. Tom Bush in Spokane ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <8825681E.006A29DC.00@ntip01.swedish.org> From: Chris.Coyle@mail.swedish.org To: steve.crips@dchs.tas.gov.au Cc: linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Wed, 3 Nov 1999 08:36:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Try QVS they have a line of dual monitor drivers. I'm using mvs 602 $64.20 U.S. Phone 800.344.3371 www.qvs.com Chris Coyle Swedish Tumor Inst Seattle, WA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <4.1.19991103212306.0094d8f0@radonc17.ucsf.edu> From: John Somers To: Per H Halvorsen , tcullen@wfubmc.edu, linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Wed, 3 Nov 1999 18:50:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We also have requested more readable displays for our LANTIS in-room information. So far no change from Siemens or IMPAC on this. But I'm glad to hear that others are asking for the same thing. Who knows, if we all keep bugging them, maybe both Siemens and Varian will get off their cans and do something about it. Now if we had a linac engineers organization to emphasize our point.... John At 09:00 AM 11/3/99 -0500, Per H Halvorsen wrote: > > We use the Windows version of Lantis (badge-engineered IMPAC), and have the > same > frustration with unreadable fonts on the in-room monitor. We have complained > about > this, and got the same "recommendation" you describe. > > We have suggested that they add a second video card in the R&V computer, and > drive > a differently formatted display for the in-room monitor (rather than just > splitting the same > signal to two monitors). Your idea has some merit, though.... > > > Per Halvorsen > Clinical Physicist > Univ North Carolina > Chapel Hill, NC > > > >> >> Steve, there is a company by the name of Extron Electronics that carries a >> good selection of video splitting equipment and cables. All of high quality. >> I am currently using their model RGB 202 xi. We have only one monitor in the >> room and use the IMPAC R+V system. The therapist can easily switch from the >> clinac console or R+V screen but rarely do so. They prefer to use the R+V >> screen most of the time in the room. >> I just found out a little disturbing info about the IMPAC system though. >> Their Windows version, when displayed in the room on a 20 inch monitor, is >> almost impossible to see from more than a meter away and they are >> recommending a work-around of placing the in-room monitor on a cart or shelf >> at eye level. I don't think this is what the therapist are looking for and >> would like to know if anyone is currently using this version and have come >> up with a better solution. The only thing I can come up with is hanging a >> larger monitor from the ceiling say 30 inch or so and then I can come in on >> the weekends and watch the football games on it :-) >> >> ---------- > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <8525681E.005F3060.00@mail.lrcc.on.ca> From: Bob.Tonks@lrcc.on.ca To: steve.crips@dchs.tas.gov.au, linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Wed, 3 Nov 1999 09:19:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Startech makes a very nice video splitter driver, its part number is ST-122. It will amplify the video signal up to 200 feet and all for about $100. Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <4.1.19991103085523.009d4af0@apophost.radonc.unc.edu> From: Per H Halvorsen To: tcullen@wfubmc.edu, linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Wed, 3 Nov 1999 06:00:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We use the Windows version of Lantis (badge-engineered IMPAC), and have the same frustration with unreadable fonts on the in-room monitor. We have complained about this, and got the same "recommendation" you describe. We have suggested that they add a second video card in the R&V computer, and drive a differently formatted display for the in-room monitor (rather than just splitting the same signal to two monitors). Your idea has some merit, though.... Per Halvorsen Clinical Physicist Univ North Carolina Chapel Hill, NC Steve, there is a company by the name of Extron Electronics that carries a good selection of video splitting equipment and cables. All of high quality. I am currently using their model RGB 202 xi. We have only one monitor in the room and use the IMPAC R+V system. The therapist can easily switch from the clinac console or R+V screen but rarely do so. They prefer to use the R+V screen most of the time in the room. I just found out a little disturbing info about the IMPAC system though. Their Windows version, when displayed in the room on a 20 inch monitor, is almost impossible to see from more than a meter away and they are recommending a work-around of placing the in-room monitor on a cart or shelf at eye level. I don't think this is what the therapist are looking for and would like to know if anyone is currently using this version and have come up with a better solution. The only thing I can come up with is hanging a larger monitor from the ceiling say 30 inch or so and then I can come in on the weekends and watch the football games on it :-) _____ Steve Cripps wrote: Hi all, I am quite new to this list and would value some information on dual in-room monitors. Does anyone have dual in-room monitors connected to VARiS, and if so, is it just a matter of using a splitter in the treatment room to drive both monitors? If this is the case, what make and/or model have you used or do you suggest? I would appreciate any feedback. Regards, Steve Cripps. Radiation Engineer. Royal Hobart Hospital (W P Holman Clinic) GPO Box 1061L Hobart TAS 7001 Australia Phone: + 61 3 6223 4000 Direct: + 61 3 6222 8618 Fax + 61 3 6234 8036 Mobile: + 61 0408 136 906 E-mail: steve.cripps@dchs.tas.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dual In-Room Monitors Message-ID: <38203C17.385ED32F@wfubmc.edu> From: tcullen@wfubmc.edu To: linac-eng@plato1.aristotle.net Subject: Re: Dual In-Room Monitors Date: Wed, 3 Nov 1999 05:43:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Steve, there is a company by the name of Extron Electronics that carries a good selection of video splitting equipment and cables. All of high quality. I am currently using their model RGB 202 xi. We have only one monitor in the room and use the IMPAC R+V system. The therapist can easily switch from the clinac console or R+V screen but rarely do so. They prefer to use the R+V screen most of the time in the room. I just found out a little disturbing info about the IMPAC system though. Their Windows version, when displayed in the room on a 20 inch monitor, is almost impossible to see from more than a meter away and they are recommending a work-around of placing the in-room monitor on a cart or shelf at eye level. I don't think this is what the therapist are looking for and would like to know if anyone is currently using this version and have come up with a better solution. The only thing I can come up with is hanging a larger monitor from the ceiling say 30 inch or so and then I can come in on the weekends and watch the football games on it :-) _____ Steve Cripps wrote: Hi all, I am quite new to this list and would value some information on dual in-room monitors. Does anyone have dual in-room monitors connected to VARiS, and if so, is it just a matter of using a splitter in the treatment room to drive both monitors? If this is the case, what make and/or model have you used or do you suggest? I would appreciate any feedback. Regards, Steve Cripps. Radiation Engineer. Royal Hobart Hospital (W P Holman Clinic) GPO Box 1061L Hobart TAS 7001 Australia Phone: + 61 3 6223 4000 Direct: + 61 3 6222 8618 Fax + 61 3 6234 8036 Mobile: + 61 0408 136 906 E-mail: steve.cripps@dchs.tas.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Dual In-Room Monitors Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: FW: Dual In-Room Monitors Date: Wed, 3 Nov 1999 03:00:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > -----Original Message----- > From: Bruijne, Keesjan de > Sent: Wednesday, November 03, 1999 10:07 AM > To: 'steve.crips@dchs.tas.gov.au' > Subject: RE: Dual In-Room Monitors > > Hi Steve, > > Yes, we have dual monitors here in the treatment rooms. > They work with via a commercial available SVGA splitter. > If you want to go this way, give special attention to the > SVGA cables. They must be of good quallity, otherwise > you will have a distorted signal at your 2nd monitor. > At our site we also installed a videoswitch, so that one > monitor can be set to the Clinac while the other stays at > the VARIS display. > > Good luck! > > Keesjan de Bruijne > Ziekenhuis Walcheren > Vlissingen, the Netherlands > afd. DIA > cj.de.bruijne@walcheren.ziekenhuis.nl > > > -----Original Message----- > From: Steve Cripps [SMTP:steve.crips@dchs.tas.gov.au] > Sent: Tuesday, November 02, 1999 11:04 PM > To: Linac Engineers List Server (E-mail) > Subject: Dual In-Room Monitors > > Hi all, I am quite new to this list and would value some information > on > dual in-room monitors. > Does anyone have dual in-room monitors connected to VARiS, and if > so, is it > just a matter of using a splitter in the treatment room to drive > both > monitors? > If this is the case, what make and/or model have you used or do you > suggest? > I would appreciate any feedback. > Regards, > > Steve Cripps. > Radiation Engineer. > > Royal Hobart Hospital > (W P Holman Clinic) > GPO Box 1061L > Hobart TAS 7001 > Australia > > Phone: + 61 3 6223 4000 > Direct: + 61 3 6222 8618 > Fax + 61 3 6234 8036 > Mobile: + 61 0408 136 906 > E-mail: steve.cripps@dchs.tas.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Dual In-Room Monitors Message-ID: <01BF25DA.570C8600.steve.crips@dchs.tas.gov.au> From: Steve Cripps Reply-To: steve.crips@dchs.tas.gov.au To: "Linac Engineers List Server (E-mail)" Subject: Dual In-Room Monitors Date: Tue, 2 Nov 1999 14:03:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, I am quite new to this list and would value some information on dual in-room monitors. Does anyone have dual in-room monitors connected to VARiS, and if so, is it just a matter of using a splitter in the treatment room to drive both monitors? If this is the case, what make and/or model have you used or do you suggest? I would appreciate any feedback. Regards, Steve Cripps. Radiation Engineer. Royal Hobart Hospital (W P Holman Clinic) GPO Box 1061L Hobart TAS 7001 Australia Phone: + 61 3 6223 4000 Direct: + 61 3 6222 8618 Fax + 61 3 6234 8036 Mobile: + 61 0408 136 906 E-mail: steve.cripps@dchs.tas.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100c-f2 auto function Message-ID: <0.d29f4baa.2550acad@aol.com> From: Accelassoc@aol.com To: linac-eng@plato1.aristotle.net Subject: 2100c-f2 auto function Date: Tue, 2 Nov 1999 13:07:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello fellow service engineers, I have a site with a Clinac 2100c that the therapists have reported a problem moving the jaws from the pendant. Sometimes when they move the jaws they return to the original setting after they stop driving- similar to driving the jaws with a cone in. After a cursory glance at the problem I noticed that when you depress the "f2 Go" button from the console keyboard that the white background on the X jaw remains on because the jaw is short .1 cm- example y=8.0, x=8.1 instead of the requested 8.0,8.0. If you do not depress "f2 stop" and go in the room (as they do when in a hurry) the condition will happen for some period of time before resuming normal pendant control. I re-calibrated the readouts for both x jaws and swapped in a new PWM board with no success. I didn't have time to check the comm processor or trace any other adjustments. Any thoughts ? Many blessings to all of you and thanks in advance for you replies. Bob Dyer Accelerator Associates, Inc. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y2K Upgrade Message-ID: <199911021037.EAA02988@plato1.aristotle.net> From: Paul Twyman To: shackie Cc: linac-eng@plato1.aristotle.net Subject: Re: Y2K Upgrade Date: Tue, 2 Nov 1999 02:27:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Hobie This all sounds very familiar to scenarios in the UK. Varian service here either don't know, can't find out or aren't there. Still lets hope that Varian get their act together soon for their sake as well as ours. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fwd: Re:Organization--latest note from AAPM Message-ID: <4.1.19991101220326.009473e0@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Fwd: Re:Organization--latest note from AAPM Date: Mon, 1 Nov 1999 19:06:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" FYI to those interested in the formation of a new organization: >X-Lotus-Fromdomain: MDACC >From: ashiu@mail.mdanderson.org >To: John Somers >Date: Fri, 29 Oct 1999 21:26:03 -0500 >Subject: Re: > >Hi John, > >Thank you for the information. I will keep the list confidential till I obtain >their permission to record in the directory. We truly believe the engineers >should have their national society and be recognized the contribution to the >Radiotherapy and Radiology communities. Thank you for your participation and >help. > >Almon > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: SL75/5 dose integrator Message-ID: <99Nov1.182947gmt.14337@firewall1.ccotrust.co.uk> From: Philip Mayles To: "'linac-eng@plato1.aristotle.net'" Subject: RE: SL75/5 dose integrator Date: Mon, 1 Nov 1999 09:28:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Although we have not made this modification I can think of three very good reasons why one might want to do it. The first is that setting up the potentiometer should it change calibration takes time - even if a relatively short time. The second is that some people may not be aware that almost any wedge factor can be set and the wedge calibration is therefore almost independent of the open field calibration so that more frequent checking is required. The third is that the wedge factor becomes arbitrary and this can mask other problems such as misalignment of the wedge. The down side is that if there are two similar machines in the department the wedge factor may differ and there may be no way of correcting this. I personally think that the solution adopted in the SL series accelerators is far more sensible and gives a better feel for what is going on - which is rather different from recommending modifying the dosimetry circuit of the SL75/5. The stability of the SL series machines also obviates the potential problems of differing wedge factors. However, if Elekta were to support such a modification I think it would be worth considering. The problem with the approach of setting the wedge dosimetry so that the wedged and open dose rates are the same is that this cannot be done simultaneously and is therefore less accurate than doing a dose measurement of the wedge output. Philip Mayles Clatterbridge Centre for Oncology > -----Original Message----- > From: Brian Whitlock [SMTP:bwhitlock@poole-tr.swest.nhs.uk] > Sent: 01 November 1999 13:07 > To: linac-eng@plato1.aristotle.net > Subject: Re: SL75/5 dose integrator > > Why would you want to do this? the calibration only takes several mins, so > I can see no reason for it. I would not expect this to be a mod which > elekta approved of. > > Brian Whitlock > > > Radiotherapy Physics > Poole Hospital > > >>> "Gordon Galloway" 10/31/99 09:52pm >>> > > > On a Philips (Elekta) SL75/5 there is a board for dose channel 1 > containing > two > potentiometers which control the output/calibration of the linac - one for > the open part, and one for the wedged part of an exposure. There is a > second identical board for dose channel two. I understand that it is > possible to disable one of these potentiometers and have the output > controlled by a single pot, for both open and wedged modes. The downside > of > doing this is that the displayed doserate for open and wedged parts will > be > slightly different (around 2%). I have several questions concerning this > modification. > > 1. Has anyone carried out this modification? > > 2. Is this an "approved" Philips modification - i.e. has anyone had this > mod carried out, and documented, by their local Philips engineer (or had a > linac supplied which was configured this way)? > > 3. Are there any disadvantages, problems or pitfalls associated with > making > this modification? > > 4. Has anyone retained the separate open and wedged calibrations, and > arranged that the sensitivity of the dose integrator for the open and the > wedged parts is such that the wedge factor is equal, or close to, unity? > > Gordon Galloway > Medical Physics > Derbyshire Royal Infirmary > Derby > UK > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: SL75/5 dose integrator Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: Re: SL75/5 dose integrator Date: Mon, 1 Nov 1999 05:06:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Why would you want to do this? the calibration only takes several mins, so I can see no reason for it. I would not expect this to be a mod which elekta approved of. Brian Whitlock Radiotherapy Physics Poole Hospital >>> "Gordon Galloway" 10/31/99 09:52pm >>> On a Philips (Elekta) SL75/5 there is a board for dose channel 1 containing two potentiometers which control the output/calibration of the linac - one for the open part, and one for the wedged part of an exposure. There is a second identical board for dose channel two. I understand that it is possible to disable one of these potentiometers and have the output controlled by a single pot, for both open and wedged modes. The downside of doing this is that the displayed doserate for open and wedged parts will be slightly different (around 2%). I have several questions concerning this modification. 1. Has anyone carried out this modification? 2. Is this an "approved" Philips modification - i.e. has anyone had this mod carried out, and documented, by their local Philips engineer (or had a linac supplied which was configured this way)? 3. Are there any disadvantages, problems or pitfalls associated with making this modification? 4. Has anyone retained the separate open and wedged calibrations, and arranged that the sensitivity of the dose integrator for the open and the wedged parts is such that the wedge factor is equal, or close to, unity? Gordon Galloway Medical Physics Derbyshire Royal Infirmary Derby UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: SL75/5 dose integrator Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: Re: SL75/5 dose integrator Date: Mon, 1 Nov 1999 05:06:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Why would you want to do this? the calibration only takes several mins, so I can see no reason for it. I would not expect this to be a mod which elekta approved of. Brian Whitlock Radiotherapy Physics Poole Hospital >>> "Gordon Galloway" 10/31/99 09:52pm >>> On a Philips (Elekta) SL75/5 there is a board for dose channel 1 containing two potentiometers which control the output/calibration of the linac - one for the open part, and one for the wedged part of an exposure. There is a second identical board for dose channel two. I understand that it is possible to disable one of these potentiometers and have the output controlled by a single pot, for both open and wedged modes. The downside of doing this is that the displayed doserate for open and wedged parts will be slightly different (around 2%). I have several questions concerning this modification. 1. Has anyone carried out this modification? 2. Is this an "approved" Philips modification - i.e. has anyone had this mod carried out, and documented, by their local Philips engineer (or had a linac supplied which was configured this way)? 3. Are there any disadvantages, problems or pitfalls associated with making this modification? 4. Has anyone retained the separate open and wedged calibrations, and arranged that the sensitivity of the dose integrator for the open and the wedged parts is such that the wedge factor is equal, or close to, unity? Gordon Galloway Medical Physics Derbyshire Royal Infirmary Derby UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: SL75/5 dose integrator Message-ID: <4.1.19991101092850.009ed170@mail.iinet.net.au> From: Ron Kimber To: gordon.galloway@lineone.net Cc: linac-eng@plato1.aristotle.net Subject: Re: SL75/5 dose integrator Date: Sun, 31 Oct 1999 17:45:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Gordon and all. I personally would not consider the mod. you mention as the circuit is applied for a specific reason. The calibration of the wedge field should take very little time and should be a normal part of the routine output calibration. It is only necessary to match the dose rate non-wedge/wedge to be the same. (So long as this is where your wedge field was initially commissioned.) I assume that you are setting at this point as the variation you mention is about 2%. Elekta released an Important Notice dated 8th October 1997 Reference A221 which gives more detail on the reasons and adjustments for the wedge/non-wedge fields. It also gives the signal line which selects the different pots if you really wish to pursue combining the calibration settings. Regards At 05:52 1999-11-01 , you wrote: > > >On a Philips (Elekta) SL75/5 there is a board for dose channel 1 containing >two >potentiometers which control the output/calibration of the linac - one for >the open part, and one for the wedged part of an exposure. There is a >second identical board for dose channel two. I understand that it is >possible to disable one of these potentiometers and have the output >controlled by a single pot, for both open and wedged modes. The downside of >doing this is that the displayed doserate for open and wedged parts will be >slightly different (around 2%). I have several questions concerning this >modification. > >1. Has anyone carried out this modification? > >2. Is this an "approved" Philips modification - i.e. has anyone had this >mod carried out, and documented, by their local Philips engineer (or had a >linac supplied which was configured this way)? > >3. Are there any disadvantages, problems or pitfalls associated with making >this modification? > >4. Has anyone retained the separate open and wedged calibrations, and >arranged that the sensitivity of the dose integrator for the open and the >wedged parts is such that the wedge factor is equal, or close to, unity? > >Gordon Galloway >Medical Physics >Derbyshire Royal Infirmary >Derby >UK Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Mobile: 041 993 7776 Fax:61 (0) 8 93814364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: SL75/5 dose integrator Message-ID: <4.1.19991101092850.009ed170@mail.iinet.net.au> From: Ron Kimber To: gordon.galloway@lineone.net Cc: linac-eng@plato1.aristotle.net Subject: Re: SL75/5 dose integrator Date: Sun, 31 Oct 1999 17:45:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Gordon and all. I personally would not consider the mod. you mention as the circuit is applied for a specific reason. The calibration of the wedge field should take very little time and should be a normal part of the routine output calibration. It is only necessary to match the dose rate non-wedge/wedge to be the same. (So long as this is where your wedge field was initially commissioned.) I assume that you are setting at this point as the variation you mention is about 2%. Elekta released an Important Notice dated 8th October 1997 Reference A221 which gives more detail on the reasons and adjustments for the wedge/non-wedge fields. It also gives the signal line which selects the different pots if you really wish to pursue combining the calibration settings. Regards At 05:52 1999-11-01 , you wrote: > > >On a Philips (Elekta) SL75/5 there is a board for dose channel 1 containing >two >potentiometers which control the output/calibration of the linac - one for >the open part, and one for the wedged part of an exposure. There is a >second identical board for dose channel two. I understand that it is >possible to disable one of these potentiometers and have the output >controlled by a single pot, for both open and wedged modes. The downside of >doing this is that the displayed doserate for open and wedged parts will be >slightly different (around 2%). I have several questions concerning this >modification. > >1. Has anyone carried out this modification? > >2. Is this an "approved" Philips modification - i.e. has anyone had this >mod carried out, and documented, by their local Philips engineer (or had a >linac supplied which was configured this way)? > >3. Are there any disadvantages, problems or pitfalls associated with making >this modification? > >4. Has anyone retained the separate open and wedged calibrations, and >arranged that the sensitivity of the dose integrator for the open and the >wedged parts is such that the wedge factor is equal, or close to, unity? > >Gordon Galloway >Medical Physics >Derbyshire Royal Infirmary >Derby >UK Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Mobile: 041 993 7776 Fax:61 (0) 8 93814364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SL75/5 dose integrator Message-ID: <199910312214.WAA12371@boober.lineone.net> From: Gordon Galloway Reply-To: gordon.galloway@lineone.net To: linac-eng@plato1.aristotle.net Subject: SL75/5 dose integrator Date: Sun, 31 Oct 1999 13:52:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On a Philips (Elekta) SL75/5 there is a board for dose channel 1 containing two potentiometers which control the output/calibration of the linac - one for the open part, and one for the wedged part of an exposure. There is a second identical board for dose channel two. I understand that it is possible to disable one of these potentiometers and have the output controlled by a single pot, for both open and wedged modes. The downside of doing this is that the displayed doserate for open and wedged parts will be slightly different (around 2%). I have several questions concerning this modification. 1. Has anyone carried out this modification? 2. Is this an "approved" Philips modification - i.e. has anyone had this mod carried out, and documented, by their local Philips engineer (or had a linac supplied which was configured this way)? 3. Are there any disadvantages, problems or pitfalls associated with making this modification? 4. Has anyone retained the separate open and wedged calibrations, and arranged that the sensitivity of the dose integrator for the open and the wedged parts is such that the wedge factor is equal, or close to, unity? Gordon Galloway Medical Physics Derbyshire Royal Infirmary Derby UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SL75/5 dose integrator Message-ID: <199910312214.WAA12371@boober.lineone.net> From: Gordon Galloway Reply-To: gordon.galloway@lineone.net To: linac-eng@plato1.aristotle.net Subject: SL75/5 dose integrator Date: Sun, 31 Oct 1999 13:52:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On a Philips (Elekta) SL75/5 there is a board for dose channel 1 containing two potentiometers which control the output/calibration of the linac - one for the open part, and one for the wedged part of an exposure. There is a second identical board for dose channel two. I understand that it is possible to disable one of these potentiometers and have the output controlled by a single pot, for both open and wedged modes. The downside of doing this is that the displayed doserate for open and wedged parts will be slightly different (around 2%). I have several questions concerning this modification. 1. Has anyone carried out this modification? 2. Is this an "approved" Philips modification - i.e. has anyone had this mod carried out, and documented, by their local Philips engineer (or had a linac supplied which was configured this way)? 3. Are there any disadvantages, problems or pitfalls associated with making this modification? 4. Has anyone retained the separate open and wedged calibrations, and arranged that the sensitivity of the dose integrator for the open and the wedged parts is such that the wedge factor is equal, or close to, unity? Gordon Galloway Medical Physics Derbyshire Royal Infirmary Derby UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Organization--more info #3 Message-ID: <4.1.19991029120558.00945900@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Organization--more info #3 Date: Fri, 29 Oct 1999 11:43:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Q: A basic question.....what will be our goal as an organization? Will it be educational, standards setting for engineers, resource for job statistics etc. ? JS: To be determined. Could include all of the above and more. We will shape it. One of Ken's aims is that our organization would have an annual meeting in conjunction with the AAPM meeting. The Radiation Therapy Techs (Therapists) do exactly that at ASTRO. ASTRO itself is an organization of physicians. By having the meetings jointly, there is a lot of shared information, short courses, and, at least as important, personal contact amongst members of both organizations. We would also get the benefit of the manufacturers' equipment and technology exhibits at the large meeting. The linac mfrs. have been assigning some of their technical people to their AAPM and ASTRO exhibit booths. And the displays get more competitive each year. Of course they don't answer all questions there, but it's at least more direct contact for us, and sometimes can lead to helpful followup. Q: Have there been many responses off list? JS: Most responses have been off the list. That's 22 so far, including several that are on behalf of more than one person, sometimes as many as 30 engineers and technologists. Rough estimate is expressions of interest by or on behalf of about 60 people. That includes about 10 from Canada, one from Austria. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Organization--more info #3 Message-ID: <4.1.19991029120558.00945900@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Organization--more info #3 Date: Fri, 29 Oct 1999 11:43:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Q: A basic question.....what will be our goal as an organization? Will it be educational, standards setting for engineers, resource for job statistics etc. ? JS: To be determined. Could include all of the above and more. We will shape it. One of Ken's aims is that our organization would have an annual meeting in conjunction with the AAPM meeting. The Radiation Therapy Techs (Therapists) do exactly that at ASTRO. ASTRO itself is an organization of physicians. By having the meetings jointly, there is a lot of shared information, short courses, and, at least as important, personal contact amongst members of both organizations. We would also get the benefit of the manufacturers' equipment and technology exhibits at the large meeting. The linac mfrs. have been assigning some of their technical people to their AAPM and ASTRO exhibit booths. And the displays get more competitive each year. Of course they don't answer all questions there, but it's at least more direct contact for us, and sometimes can lead to helpful followup. Q: Have there been many responses off list? JS: Most responses have been off the list. That's 22 so far, including several that are on behalf of more than one person, sometimes as many as 30 engineers and technologists. Rough estimate is expressions of interest by or on behalf of about 60 people. That includes about 10 from Canada, one from Austria. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Organization support--more info #2 Message-ID: <4.1.19991028122114.009464b0@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Organization support--more info #2 Date: Thu, 28 Oct 1999 11:56:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" "FAQ" Q: there are at least x# of us who are interested in joining your organization. Q: Who has volunteered to the startup officers positions? JS: No organization exists yet, no positions exist. Nobody has volunteered yet, except for 5 or 6 people who volunteered to be at the ASTRO meeting. Things should begin taking somewhat more shape after that. Meanwhile, if anyone wants to volunteer for anything, it's wide open. I'll take notes and distribute communications. What's happening now is just the beginning of an effort to help from the AAPM. This is to help us set up our own, independent organization. It is not intended to establish any organization or membership for us within the AAPM itself. We are still in the very early stages of this effort. Ken's aim is to move deliberately and rationally towards an effective AAPM mechanism to help us. But much will be up to us, and the resulting organization will be ours, not the AAPM's. Ken is just beginning to set up an AAPM committee, to be charged with facilitating, but not directing or shaping, the formation of a "linac engineers" organization (let's say the LINEACS for lack of anything definite at this time). It will be up to us to do the actual formation of the organization. Seems appropriate. Right now, it is up to us to demonstrate to the AAPM our interest and intent to carry this through. This will be done partly by attendance and participation in the discussion at the ASTRO meeting. Later there can be some kind of interorganizational interaction between the AAPM and the LINEACS. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Elekta SL Sec Access terminal lockup Message-ID: From: Denny Yu To: "'Whitham, Richard'" , 'Chris FORREST' , linac-eng@plato1.aristotle.net Subject: Elekta SL Sec Access terminal lockup Date: Thu, 28 Oct 1999 07:47:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, We have been runinig 3.1.0 for over half a year on two SL20s' without any secondary access lockup problems. Other then that,in average of twice daily, Dr. Watson error message appeared in the color moniter. Three weeks ago, we installed a switch in the LAN before the hub in the Javelin. Since then, Dr. Watson decided not to vist us anymore. Just a thought on your Secondary Access lockup, with the RS232 interface, if the cable is too long, a line driver may be helpful for the data flow. I believe you must have been looked into this issue already. Regards, Denny Yu Fraser Valley Cancer Centre B.C. Canada Email: dyu@bccancer.bc.ca 604-930-4051 -----Original Message----- From: Whitham, Richard [mailto:Richard.Whitham@rmp.uhn.on.ca] Sent: Wednesday, October 13, 1999 8:48 AM To: 'Chris FORREST'; linac-eng@plato1.aristotle.net Subject: RE: SL Sec Access terminal lockup Chris, We have been running 3.1 for over two months on four SL25's without any secondary access problems. Occassional Dr. Watson error message from colour computer but that's been random since colour upgrade last year. Regards, Richard BW Princess Margaret Hospital, Toronto, Canada > -----Original Message----- > From: Chris FORREST [SMTP:chrisf@ulth.northy.nhs.uk] > Sent: Friday, October 01, 1999 9:52 AM > To: linac-eng@plato1.aristotle.net > Subject: SL Sec Access terminal lockup > > 1) Since Upgrading to 3.1 s/w on our 3 Javelin Based SLs, we've had the > Sec. Access terminal comms lockup on an intermittent basis. > The only way to clear it has been to Re-boot Javelin. > > Anyone else experienced this phenomenon? > > > > > > Chris Forrest > Cookridge Hospital > Leeds UK > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RF Driver Repair Message-ID: <0.425bcf47.2549aec3@aol.com> From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: RF Driver Repair Date: Thu, 28 Oct 1999 05:50:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to All, I remember (I think) awhile back something about a source for repair of the SPC Rf driver. (For Varian High Energy) Could anyone provide me with a phone number or address. Thank you, Roger ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Maintenance Software Message-ID: <99Oct28.092752edt.115625@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: Maintenance Software Date: Thu, 28 Oct 1999 05:16:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We use our own software to handle our database needs, it is called ACCEL and will be available for sale after January, 2000. There is a free demo of Accel posted on the Web at http://www.geocities.com/soho/lofts/1053/accel/accel.htm . Please contact me privately if you are interested in buying a copy, I dont want to use this forum for marketing our products. Regards, Tom Feuerstake Princess Margaret Hospital Toronto -----Original Message----- From: Chris Bartee [SMTP:clbartee@hsc.vcu.edu] Sent: Wednesday, October 27, 1999 10:59 AM To: linac-eng Subject: Maintenance Software I saw some email traffic awhile back about CMMS. Of course I discarded all of the emails because I was not in need of maintenance s/w at that time. If anyone has any input or recommends a specific system I would appreciate your response. At this facility, we have approx, 5 accelleraters, 4 simulators, 1 accusim, and Various types of Mlc, and portal vision on all accelerators. And of course all other misc stuff no one else wants. Thank you, Chris Bartee Medical College of Virginia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Maintenance Software Message-ID: <38171348.8BF91ED@hsc.vcu.edu> From: Chris Bartee To: linac-eng Subject: Maintenance Software Date: Wed, 27 Oct 1999 06:59:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I saw some email traffic awhile back about CMMS. Of course I discarded all of the emails because I was not in need of maintenance s/w at that time. If anyone has any input or recommends a specific system I would appreciate your response. At this facility, we have approx, 5 accelleraters, 4 simulators, 1 accusim, and Various types of Mlc, and portal vision on all accelerators. And of course all other misc stuff no one else wants. Thank you, Chris Bartee Medical College of Virginia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Elekta leaf motors (posted only once) Message-ID: <99Oct27.112917edt.115640@gateway.healthlink.on.ca> From: "Abbassian, Farhoud" To: "AE-LIST (E-mail)" Subject: RE: Elekta leaf motors (posted only once) Date: Wed, 27 Oct 1999 07:18:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Denny, You can purchase the drive motors from Micro Mo Electronics Inc. (distributor for SAYAMA ). Part number: SC12G-2008 15:1 Price: $82.00cdn Micro Mo Electronics Inc. 14881 Evergreen Ave. Clearwater, Fl. US 33762-3008 Tel: 800-807-9166 www.micromo.com Make sure you ask for axial leads so you can crimp/solder the contacts. Regards, Farhoud Abbassian Princess Margaret Hospital Toronto, Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: GE Saturne Linac: Part Problems Message-ID: <008e01bf2064$a4394ba0$427abcbc@pc1950> From: "J.Y.Methven" To: Linac Engineering List Subject: GE Saturne Linac: Part Problems Date: Wed, 27 Oct 1999 02:18:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Scott Varnum wanted to hear about part problems in respect of GE Saturne linear accelerators: We are the only site in England with Saturne linacs. All our parts are sourced from France via the Varian office in Crawley, England. We do not have any problems with ordering or delivery. We have recently experienced problems with replacement parts which have not functioned to specification. Some parts are re-conditioned rather than new and this has caused us significant concern and difficulty. In the past, when GE provided the service support, we experienced problems with parts which were DOA - this was resolved. I hope this issue is not recurring. We have concerns about the long-term commitment of Varian to the GE linacs. I too would be interested to know about problems related to support and logistics. Jim Methven Mr J.Y. Methven BA, IIPEM Principal Medical Technologist (Electronics) Regional Medical Physics Department Newcastle-Upon-Tyne England United Kingdom NE4 6BE ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Organization support--more info Message-ID: <4.1.19991026140622.00952410@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Organization support--more info Date: Tue, 26 Oct 1999 16:13:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks for the many responses in support of renewing the effort to form an organization. They have been generally very positive, and include some excellent suggestions. Of course, some questions have been raised. In the interest of time, and to keep everybody informed, I will post the questions, with some response, to the linac-eng list rather than sending individual responses. If anyone feels their concerns have not been noted or addressed, please ring my bell again. And if you have a question or concern you don't want the whole world to see, please note that when you post to me (Mark it as private, personal, confidential, restricted, top secret or whatever). And, it's a wide open discussion, which i don't intend to manage or direct, only to facilitate, so feel free. Here we go-- Ken Allen wrote: "As far as I am concerned this sounds like an excellent start. My biggest question is if there are any plans to include/expand into Canada as well?" JS: This would be one of the many things the AAPM has the resources to help with. By that I mean the aapm organization will have access to accurate information about what issues are involved, legally, logistically, and otherwise, in making an organization international versus domestic U.S. in scope. It may be that the domestic version is the starting point, with planned expansion capability. (upgrade path by design! :~) Or it may be better or more feasible to begin with an aim of building legally separate organizations in various countries, possibly somehow affiliated with each other. I will put this on a list of Frequently Asked Questions (FAQ), to be addressed. Danny Sutton wrote: "If I had known about a month ago of the meeting being during ASTRO I could have attended but I now have other commitments." JS: Right, I wish I had the info sooner so more people could have planned for it too. Things are getting better though. Everyone please note that this effort is only one item on a very heavy list that Ken Hogstrom and the AAPM are dealing with. At this point I'm just glad we're on that list and something is happening. We can expect similar followup meetings at the RSNA meeting later this fall in Chicago, then next year at both the AAPM and ASTRO meetings. Maybe someone can supply the dates and locations for each of those. I will post details of scheduled meetings as soon as available. Steve Schwarz of Acceletronics wrote: "When Jim Beatty had the org. ball a few years back, I met with him & a few other guys at an ASTRO & offered to build & host the new org's website (on our existing server) as a corporate sponsor. I'd still like to explore that possibility or corporate sponsorship in general, if the org gets off the ground." JS: This is a generous and supportive offer. Again, at some point, I would expect helpful input from the offices of the AAPM regarding best arrangements for any kind of corporate sponsorship. I hope that other linac engineers will offer their comments about this. And about how useful a website would be at this time. For example, is everyone now able to readily access such a site and use it regularly enough to rely on it for broad-based communications? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Elekta MLC leaf motor Message-ID: From: Denny Yu To: "'linac-eng@plato1.aristotle.net'" Subject: Elekta MLC leaf motor Date: Tue, 26 Oct 1999 11:41:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello: Does anyone has any second sourcing information on the Elekta SL20 MLC leaf driving motors? Label on the motor say " microreduction SAYAMA", " made in Japan" Our two five year old SL20s are in the states of requiring frequent motor replacements. Would be nice if there are alternate parts source available. Thank you for your input. Regards, Denny Yu Fraser Valley Cancer Centre. B.C. Canada. Email: dyu@bccancer.bc.ca Phone: (604) 930-4051 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Organization support Message-ID: <4.1.19991026113530.0093fee0@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Organization support Date: Tue, 26 Oct 1999 07:57:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To interested parties, Ken Hogstrom, President-elect of the AAPM, sent a message that he has scheduled a meeting during the ASTRO annual meeting of "Investigational Committee for Formation of Professional Society for Radiotherapy Accelerator Engineers/Technicians." The meeting is scheduled for: Sunday, October 31, 1999 8:30-10:30 am Henry B. Gonzalez Convention Center- Room 103 This is at the ASTRO meeting in San Antonio. Ken is very supportive of the linac engineers being able to form their own organization. He aims to set up something in the AAPM to help with that. This is now in the early stages. When I talked with him he said that any showing of support from us will be helpful for him. So that would include attending this meeting for anyone who can. I won't be able to attend. I think this is very good news that he is devoting some time and attention to help us, especially from the position he has now been elected to. Maybe this will provide some of what has been needed in the previous efforts to form an organization. Please RSVP if you can attend. At Ken's request, I have agreed for now to help as a communication liaison from this list to the AAPM side. I am also forwarding to the AAPM a list of interested linac engineers, so if you want to be included, please let me know, with your contact info. John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Magnetron foam collars Message-ID: <0.515c5af7.25471ade@aol.com> From: MLancaster@aol.com To: linac-eng@plato1.aristotle.net Subject: Magnetron foam collars Date: Tue, 26 Oct 1999 06:55:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tom's message concerning the arcing problems was interesting. I haven't experienced that unless the foam was too far down (towards the end) of the tube. I hadn't considered the problem of the filament leads flexing, or bowing out towards the side, but they certainly do. As a note, if you use a Litton tube you don't need the foam as they pot the bells with a conductive silicone. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: GE Saturn Linac: Part Problems Message-ID: <38FC380A0D25D211A6660000F804F63C01A40D94@BHSEXC1> From: "Varnum, Scott" To: linac-eng@plato1.aristotle.net Subject: GE Saturn Linac: Part Problems Date: Tue, 26 Oct 1999 05:41:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Anyone out there experiencing a significant increase in Parts problems in last seven months? Such as: * DOA (Dead on Arrival) Parts * Damaged * Missing Components * Increased Part Failures * Logistics Problems * Parts often Not Available in USA and need to go to France with major delays * Poor tracking of where abouts of parts * Have to reorder parts Thanks. F.Scott Varnum,BEE, MBA Director, Clinical Engineering Baystate Health System 3601 Main Street Springfield, MA 01199 Associate Professor Graduate Biomedical Engineering BEACON (The Biomedical Engineering Alliance of Connecticut) Program University of Connecticut Phone: 413.794.3382 Fax: 413.794.5570 Fax E-mail: scott.varnum@bhs.org > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Philips RT100 Message-ID: <9910260224.AA19937@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Subject: Philips RT100 Date: Mon, 25 Oct 1999 18:05:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello everybody, We are looking for a spare X-ray tube assembly for Philips RT100, part # 9811 2010 0002. Our local suppliers claim that the tube is no longer manufactured and the machine itself is no longer supported. Any suggestions on this matter or offers of spare tubes (even secondhand ones) will be greatly appreciated. By the way, we still have not prooved that the tube itself had failed. The simpthoms are: - the machine drains excessive current for 3 seconds then interlocks. At higher energies it even trips the mains circuit breaker. - we isolated and tested the cable and the tube with the megger. The cable took about 200 mcA at 12 KV while the tube drains a lot of current at much lower kVs. So we assume that some sort of leakage path has developed inside the housing. We do not know how to take it apart. And the last question. How to fill the housing (connector enclosure) with oil and release the air. Regards, Andrew Frolov Manager, Radiation Engineering Medical Physics Royal Adelaide Hospital Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2300C/D HVCB intermittently trips Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: "Loeks, Michael" Cc: "'linac-eng@plato.aristotle.net'" Subject: Re: 2300C/D HVCB intermittently trips Date: Mon, 25 Oct 1999 13:40:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Check the status of the battery that supplies your emergency couch pendant controls. This battery aslo supplies the 24VDC to keep the HVCB undervoltage release circuit energized. If the battery voltage is too low you can get HVCB "trips"... len.j. On Mon, 25 Oct 1999 10:37:47 -0700 "Loeks, Michael" wrote: > Hello everyone, > I am having a problem with our 2300C/D. It is manifested by the HVCB > tripping with no other interlocks. It doesn't trip with any discernable > timing with relation to beam on except that beam has to be on to trip. When > I arrived in the department Friday, the HVCB was tripping pretty regularly. > I tried replacing the HVPS rectifiers CR1-CR12, the main thyratron, the > thyratron trigger PCB and the thyratron grid PS PCB. None of these fixed the > problem. After about an hour the breaker wouldn't trip anymore. I thought > the current was going through the main thyratron tube because the breaker > didn't trip when the wire was removed from the anode of the thyratron. This > was probably a red herring as there is not an HVOC interlock and the breaker > trips even with the thyratron triggers turned off. The thyratron grid > voltage ranges from 304 to 330 VDC depending on which energy is selected and > whether the thyratron triggers are off. The mains voltage is right at > 200Vrms which seems a little low to me. I am wondering if possibly the mains > voltage is a little bit low which is causing the HVCB to trip > intermittently. I have not had the opportunity to measure the current > through the breaker yet because the machine has been working fine so far > this morning but this is the direction I intend to go unless anyone has a > better suggestion. Any suggestions are appreciated. > Thanks, > Michael Loeks > Clinical Engineering Technician > Providence Portland Medical Center > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2300C/D HVCB intermittently trips Message-ID: <99Oct25.164212edt.115683@gateway.healthlink.on.ca> From: Tom Feuerstake Reply-To: Tom Feuerstake To: "'linac-eng@plato.aristotle.net'" Subject: Re: 2300C/D HVCB intermittently trips Date: Mon, 25 Oct 1999 12:27:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Do you have a DQ Thyratron on that machine? They can fail in unusual ways. For example, sometimes they fail to fire, causing the PFN to charge all the way to maximum, resulting in a large current pulse when the main thyraton fires. Good Luck, Tom Feuerstake, Accelerator Service PMH Toronto -----Original Message----- From: Loeks, Michael To: 'linac-eng@plato.aristotle.net' Date: Monday, October 25, 1999 1:55 PM Subject: 2300C/D HVCB intermittently trips >Hello everyone, > I am having a problem with our 2300C/D. It is manifested by the HVCB >tripping with no other interlocks. It doesn't trip with any discernable >timing with relation to beam on except that beam has to be on to trip. When >I arrived in the department Friday, the HVCB was tripping pretty regularly. >I tried replacing the HVPS rectifiers CR1-CR12, the main thyratron, the ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2300C/D HVCB intermittently trips Message-ID: From: "Loeks, Michael" To: "'linac-eng@plato.aristotle.net'" Subject: 2300C/D HVCB intermittently trips Date: Mon, 25 Oct 1999 09:37:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello everyone, I am having a problem with our 2300C/D. It is manifested by the HVCB tripping with no other interlocks. It doesn't trip with any discernable timing with relation to beam on except that beam has to be on to trip. When I arrived in the department Friday, the HVCB was tripping pretty regularly. I tried replacing the HVPS rectifiers CR1-CR12, the main thyratron, the thyratron trigger PCB and the thyratron grid PS PCB. None of these fixed the problem. After about an hour the breaker wouldn't trip anymore. I thought the current was going through the main thyratron tube because the breaker didn't trip when the wire was removed from the anode of the thyratron. This was probably a red herring as there is not an HVOC interlock and the breaker trips even with the thyratron triggers turned off. The thyratron grid voltage ranges from 304 to 330 VDC depending on which energy is selected and whether the thyratron triggers are off. The mains voltage is right at 200Vrms which seems a little low to me. I am wondering if possibly the mains voltage is a little bit low which is causing the HVCB to trip intermittently. I have not had the opportunity to measure the current through the breaker yet because the machine has been working fine so far this morning but this is the direction I intend to go unless anyone has a better suggestion. Any suggestions are appreciated. Thanks, Michael Loeks Clinical Engineering Technician Providence Portland Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y2K Message-ID: <0.ebf480e.2545c6c5@aol.com> From: MLancaster@aol.com To: "Wilson, Jim" Subject: Re: Y2K Date: Mon, 25 Oct 1999 06:44:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, I understand it doesn't do anything with, or to, Varian's software. It's just that Varian has always had the stance that it was forbidden to run ANY software on the computer that they didn't approve and supply. Let's face it, they won't even allow you to run something like Word, which obviously doesn't have anything to do with the linac operation and which was written by Microsoft. Anyway, just a note of concern. I would hate for anyone to get into trouble (remember that Varian folks do read this list). I had a friend who had a similar program to tweak the DOS date so he could run demo program permanently; pretty cool. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y2K Message-ID: <8cff6fe2.2541cc81@aol.com> From: MLancaster@aol.com To: "Wilson, Jim" Subject: Re: Y2K Date: Fri, 22 Oct 1999 06:19:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, have you given careful thought to the potential liability of "diddling" with the software on a therapy unit? Varian for one, absolutely forbids the installation of any software not provided by them onto a computer connected to one of their machines. You may not care, and the likelihood of it ever becoming an issue is minute, but it is there. And, there are always those pesky lawyer-types hiding around the corner ready to pop out when you least expect them... Mike Lancaster Oncology Maintenance Services ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y2K Message-ID: <0.49a93f41.254129dc@aol.com> From: RSAINC1@aol.com To: "Wilson, Jim" Subject: Re: Y2K Date: Thu, 21 Oct 1999 18:45:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hey, Could you give us some more information on this program.??? Roger ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: foam collars on Low energy varian magnatrons Message-ID: From: busht@shmc.org To: "'Linac-eng@plato1.Aristotle.net'" Subject: foam collars on Low energy varian magnatrons Date: Thu, 21 Oct 1999 13:45:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have some experience with the foam collors on magnatrons. SOME (a very few) machines NEEDED a foam collar because of the properties of the particular magnatron and the system. This was not usually the case but Varian put the collars on every machine. this actually caused more problems (in my opinion) than the origional problem of RF in the AFC assy. Yes: the foam collar reduces the stray RF from the Maggi and solves some problems of cross-coupled RF BUT, the collar would also cause arcing thru the maggi case (black bakelite/plastic) which would cause all sorts of problems with the Yield servo function and mod faults etc. The cure (if used) was to raise the conductive foam collar 1 inch from the bottom-most travel on the body of the maggi and aso to add an eighth of an inch (thick) of electrical tape under the BOTTOM sharp edge of the foam collar by simply wraping it around the maggi at that point of contact. In other words, don't let the foam collar be a path to ground for the HV just inside the maggi. If the HV is arcing to the edge of the foam collar it will be at the TOP edge (due to the bottom edge being grounded) of the foam and with the proper light you will see many small arc spots where the HV came right thru the case. Oh by the way...The HV wire is just on the inside of the maggi case at one third down from the top. Due to the assembly requirements the filiment wire bows outward toward the top edge of the foam collar. arcle sparkle !! These are most likely just my own opinions and of very little real value. Tom Bush in Spokane, Wash. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SL75 RDO's Message-ID: <380F6974.52625BE@Freenet.co.uk> From: Paul Whittard To: linac-eng@plato1.aristotle.net Subject: SL75 RDO's Date: Thu, 21 Oct 1999 11:28:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Everyone. Thanks to all those who offered suggestions in response to my recent posting about the RDO's we were having on our SL75. It actually turns out that the bonding cable for the pulse earth bus bar (which bolts to one of the main chasis supports in the central section at the rear of the machine) has gone flaky. We discovered this by connecting a supplementary earth from the bus bar first of all to the main earthing point on the HT transfromer and proceeding from there. This bonding cable is of a braided construction which is surronded by a free insulating sleeve. Although we have yet to examine the offending item I guess that some corrosion of the braid may have occured by moisture getting between the sleeve and the wire. There is no corrosion around the bolts at either end of the cable. Regards Paul Whittard Royal Berkshire Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Y2k....More stuff. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Y2k....More stuff. Date: Thu, 21 Oct 1999 11:54:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day fellow techno-gnomes. We are at the leading edge of technology. We will get to try these thing out before most of you have even realised there are also time zones involved. Our site is running 2100 #1164 MLC PV 5.4 on dell optiplex. 2100 #40 5.4 on dell, 600 #248 5.4 on Dell 486, MLC shaper on dell 486 win95. Ximatron #old (IBM PC), Varis. Focus treatment planning and so on ......... We have done much testing and evaluation with our biggest compromise being white paint on the ximatron screen to correct the 19100 (year field of date). Apart from manual date changes, we expect everything to be OK. We will be on site early pm NZDT 1-1-2000 (that is day-month-year format) to do some testing. I will report our findings. No posting and the net is down. Dave. PS How do you know a software engineer has been using your PC ??? There is white paint on the screen..... PPS Our v5.4 upgrade on #40 was straight from the book- no probs at all. Apart from throwing the old IBM and getting the speed improvement in booting service mode the best thing about 5.4 is the DD-file decoder. A real beaut. ********************************************** The early worm gets caught. ********************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y2K Message-ID: <006f01bf1bf1$af9662c0$850870c3@chris> From: Christine Usher Reply-To: Christine Usher To: linac-eng@plato1.aristotle.net Subject: Re: Y2K Date: Thu, 21 Oct 1999 10:17:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ----- Original Message ----- From: Wilson, Jim To: ; Sent: Thursday, October 21, 1999 3:46 PM Subject: RE: Y2K All interesting solutions - we went for the pay up solution, and had all our linacs upgraded. Where you have implemented in house solutions, who has certified the equipment Y2K compliant. Are you sure it will not be the physics departmetn who take the rap if things don't work as you imagine Chris > I have installed a program that diddles with the real time clock and makes > the old IBM (version 3 SW) compliant. > > > To: linac-eng@plato1.> > > Hello All, > > I have a general question for everyone who has Varian C series > machines. How are you dealing with Y2K issues? Is the cost of the > upgrade to Rel 5.4 and upgrading the PC worth the investment or do you > plan on manually setting the real time clock in you current platform > at the turn of the century? What issues have you encountered or > foresee? > > Kerry Price > Lutheran General Hospital > Park Ridge, IL USA > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD RF noise. The solution MK II Message-ID: <86256811.00548DD3.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Subject: 600CD RF noise. The solution MK II Date: Thu, 21 Oct 1999 07:14:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Paul, sounds like that machine is giving you a heck of a go. I take it you mean that Varian installed the dreaded Conductive Foam Collar on the magnetron. -Ot is this something really new and different (the foam collar solution actually dates to the 4/100 period)? I hope all is well with you otherwise. TimW ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re[2]: Y2K Upgrade Message-ID: <001016E8.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: shackie Cc: linac-eng@plato1.aristotle.net Subject: Re[2]: Y2K Upgrade Date: Thu, 21 Oct 1999 07:26:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hobie: I appreciate all of the information! Were the MLC PC's provided by Varian and what model are they? Kerry ______________________________ Reply Separator _________________________________ Subject: Re: Y2K Upgrade Author: shackie at PO_EXTERNET Date: 10/20/99 9:22 PM Kerry: Good timing! We just went through an upgrade last weekend; but more on that later. We have two 2100C's in this category. One s/n 012 and one s/n 637. The oldest linac has (if memory serves me) the oldest operating system software listed in the Varian Y2K documents which seems to have minimal Y2K issues. That system is not going to be upgraded. We felt the newer unit had more issues to resolve in its version (3.4?) and that the upgrade would bring the system to a level where adding some of the more recent options (like enhanced dynamic wedge) would be easier. We are also going with the MLC "Y2K" upgrade (on a third linac currently at V 5.4) because of concern over possible problems with the patient files. Now on to the upgrade problems: 1. Never, never, never plan a Varian upgrade on a Friday. We thought it was a good idea to allow physics (me) to do the Varian required checks and start the annual checks (due anyway) on an upgraded machine. Unfortunately the upgrade did not work, Varian did not ship documentation on a new board, and no one at Varian tech support answered the phone between 4:15 and 5:15 pm PST. It seems that providing tech support when the customer would like the repair work done is too expensive. I guess Varian expects its customers to shut down their clinics or their field service engineers to be superstars (although ours are close). 2. Given the upgrade failure and no way to troubleshoot it, the engineers backed up to the old software but kept the new hardware (computer and some Varian parts). But now we had no communication with IMPAC. We figured one day treating off line would not be much of a burden, wrong! Treating 66 patients, many with IJ's, turned out to be therapist's hell. 3. The Varian engineer tried to get replacement parts on the weekend and most were not in stock (more cost savings?). On Monday he tracked down spare PCB's compatible with v 5.4 at another site while another engineer tracked down the missing documentation at a new installation. 4. At the 2nd upgrade attempt it was discovered that the linac was older than indicated by its s/n and a replacement PCB needed was not in the upgrade kit. Varian either did not know or did not check the machine configuration (QA breakdown or further cost cutting?). Fortunately, the borrowed parts enabled the upgrade to be completed successfully. After this experience I checked the computers involved in the MLC upgrade with the Microsoft checking program. Guess what? The Windows 95 installed is not Y2K compliant!! Hobie Shackford Medical Physicist Saint Anne's Hospital Fall River, MA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y2K Message-ID: <380F169F.BED7C61E@wfubmc.edu> From: tcullen@wfubmc.edu To: Linac eng Subject: Re: Y2K Date: Thu, 21 Oct 1999 05:35:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kerry, spend some money upgrade everything. That's what this Y2K compliance thing is all about, money. The higher authorities here have dictated that we do what it takes to become Y2K compliant and we didn't argue. You see, this comes at a point where the PC's need replacing anyway (one bombed out during the upgrade).... and the SW upgrades....well what can I say about the SW upgrades. It's good to stay current?? It allows new treatment modalities?? Oh well you see what I mean. The 5.4 upgrade does very little for you from ver 3.4 if you have not changed the way you treat patients. We have kept current with SW because we have incorporated some of the new features offered, but not all of them. If you are anywhere near replacing an old unit or have no intention of doing anything fancy with the clinical use of the unit...common sense tells you why bother. On the other hand, old SW/HW loses support fast in this day-and-age, especially if you are interfacing two different vendors (clinac&RV). As far as compliance issues and the manufacturers, they seem to be covering their asses by posting on web pages what you have to do to become Y2K compliant. In other words, you were informed that you should have spent a lot of money. Of course none of this matters because this guy on the street corner this morning told me the world is coming to a screeching halt that same day. :-) Kerry Price wrote: > Hello All, > > I have a general question for everyone who has Varian C series > machines. How are you dealing with Y2K issues? Is the cost of the > upgrade to Rel 5.4 and upgrading the PC worth the investment or do you > plan on manually setting the real time clock in you current platform > at the turn of the century? What issues have you encountered or > foresee? > > Kerry Price > Lutheran General Hospital > Park Ridge, IL USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Y2K Message-ID: From: Terence Kearey To: Kerry.Price@advocatehealth.com, linac-eng@plato1.aristotle.net Subject: SV: Y2K Date: Thu, 21 Oct 1999 05:35:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Kerry et al, >From Varian's Y2K site it doesn't look like its strictly necessary to upgrade to 5.4. Setting the rtc should, as you say, fix it. http://www.varian.com/vms/oncology/y2k/statment.html It rather depends on the actual machine you have, software version and peripheral equipment, check and confirm equipment and the so on. I had been planning to set the clock and carry on running the = computers, however, the disk drives whirr on their last legs so I have now = replaced the computers and we will be upgrading as we are getting a package deal = with new equipment. Regards Tel -----Ursprungligt meddelande----- Fr=E5n: Kerry.Price@advocatehealth.com = [SMTP:Kerry.Price@advocatehealth.com] Skickat: den 20 oktober 1999 17:45 Till: linac-eng@plato1.aristotle.net =C4mne: Y2K Hello All, I have a general question for everyone who has Varian C = series machines. How are you dealing with Y2K issues? Is the cost of the upgrade to Rel 5.4 and upgrading the PC worth the investment or do you plan on manually setting the real time clock in you current platform = at the turn of the century? What issues have you encountered or = foresee? Kerry Price Lutheran General Hospital Park Ridge, IL USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Sorensen PS Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB4B0@liosex1.lio.se> From: Viking Eilert To: 'James Lollar' , "'linac-eng@plato1.aristotle.net'" Subject: SV: Sorensen PS Date: Thu, 21 Oct 1999 02:31:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello. We got three DRC60-45B, one DCRB 6045, one DCRB 40-40 and one DCR 40-70 = used Sorensen power supply we don't use any more. Interested? Eilert Universitetssjukhuset i Link=F6ping Eilert Viking O-centrum telefon: +46-13 222805 Radiofysikavdelningen fax: +46-13 222895 Sjukhusfysik e-post: Eilert.Viking@lio.se S-581 85 Link=F6ping Sverige telefon: +46-13 222000 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD RF noise. The solution MK II Message-ID: <199910211017.FAA03199@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: 600CD RF noise. The solution MK II Date: Thu, 21 Oct 1999 03:08:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to everybody You may remember that a few weeks ago we were having problems with our 600CD and its spiky MAG I pulse. The cure for this was the elusive modulator mod that installed some extra resistors, capacitors and an inductor. Well this did not completely cure our intermittent false interlock problems. We still suffered from FLOW, ACC, ION 1,ION 2 etc. We invited Varian back on site and another mod has been installed which seems to have done the trick. The magnetron has had some RF absorbers installed around its glassware. If any of you are suffering from unexplained interlocks tripping contact you're local Varian service centre and enquire about this new mod. If any of you have had this mod fitted please let me know as I am eager to discover if this is the final chapter in this saga. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y2K Upgrade Message-ID: <380E78E5.CFAF864B@concentric.net> From: shackie To: Kerry Price Cc: linac-eng@plato1.aristotle.net Subject: Re: Y2K Upgrade Date: Wed, 20 Oct 1999 18:22:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kerry: Good timing! We just went through an upgrade last weekend; but more on that later. We have two 2100C's in this category. One s/n 012 and one s/n 637. The oldest linac has (if memory serves me) the oldest operating system software listed in the Varian Y2K documents which seems to have minimal Y2K issues. That system is not going to be upgraded. We felt the newer unit had more issues to resolve in its version (3.4?) and that the upgrade would bring the system to a level where adding some of the more recent options (like enhanced dynamic wedge) would be easier. We are also going with the MLC "Y2K" upgrade (on a third linac currently at V 5.4) because of concern over possible problems with the patient files. Now on to the upgrade problems: 1. Never, never, never plan a Varian upgrade on a Friday. We thought it was a good idea to allow physics (me) to do the Varian required checks and start the annual checks (due anyway) on an upgraded machine. Unfortunately the upgrade did not work, Varian did not ship documentation on a new board, and no one at Varian tech support answered the phone between 4:15 and 5:15 pm PST. It seems that providing tech support when the customer would like the repair work done is too expensive. I guess Varian expects its customers to shut down their clinics or their field service engineers to be superstars (although ours are close). 2. Given the upgrade failure and no way to troubleshoot it, the engineers backed up to the old software but kept the new hardware (computer and some Varian parts). But now we had no communication with IMPAC. We figured one day treating off line would not be much of a burden, wrong! Treating 66 patients, many with IJ's, turned out to be therapist's hell. 3. The Varian engineer tried to get replacement parts on the weekend and most were not in stock (more cost savings?). On Monday he tracked down spare PCB's compatible with v 5.4 at another site while another engineer tracked down the missing documentation at a new installation. 4. At the 2nd upgrade attempt it was discovered that the linac was older than indicated by its s/n and a replacement PCB needed was not in the upgrade kit. Varian either did not know or did not check the machine configuration (QA breakdown or further cost cutting?). Fortunately, the borrowed parts enabled the upgrade to be completed successfully. After this experience I checked the computers involved in the MLC upgrade with the Microsoft checking program. Guess what? The Windows 95 installed is not Y2K compliant!! Hobie Shackford Medical Physicist Saint Anne's Hospital Fall River, MA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Y2K -Reply Message-ID: <00100B9B.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net Subject: Y2K -Reply Date: Wed, 20 Oct 1999 14:53:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Kerry We have two 2100C linacs both with PS2s. I have set both internal clocks to 11:59:00 12/31/99 and passed away the minute to verify that the machines still work. Instead of replacing the Pcs I will be setting the clocks on 1/1/00. We will eventually upgrade the platforms when we either replace the linacs or add modalities ( EPID, MLC etc.) I will be doing the same for the Xim C. Varis will accommodate the change by it self. Please publish your results on the list. Bob Lindeyer Hartford Hospital Hartford CT >>> Kerry Price 10/20/99 12:34pm >>> Hello All, I have a general question for everyone who has Varian C series machines. How are you dealing with Y2K issues? Is the cost of the upgrade to Rel 5.4 and upgrading the PC worth the investment or do you plan on manually setting the real time clock in you current platform at the turn of the century? What issues have you encountered or foresee? Kerry Price Lutheran General Hospital Park Ridge, IL USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Y2K Message-ID: <000FFD11.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net Subject: Y2K Date: Wed, 20 Oct 1999 08:34:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All, I have a general question for everyone who has Varian C series machines. How are you dealing with Y2K issues? Is the cost of the upgrade to Rel 5.4 and upgrading the PC worth the investment or do you plan on manually setting the real time clock in you current platform at the turn of the century? What issues have you encountered or foresee? Kerry Price Lutheran General Hospital Park Ridge, IL USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SL ion chamber Message-ID: <199910201116.NAA29615@chouffe.radth.ruu.nl> From: Eric Westzaan To: linac-eng@plato1.aristotle.net Subject: SL ion chamber Date: Wed, 20 Oct 1999 03:15:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Accelarator maniacs, Last Monday I had a leaking carbon fiber ion-chamber of issue 1 in one of our Elekta SL machines. I removed the chamber, tightened al srews and nuts, cleaned the surface with ether and used Nitrogin as recommended by Ron Kimber. Replaced the thing and it is in use after a dosimetry check since monday 11 am without a problem. What excactly solved the problem and for how long is unknown to me. Obvious is that you should think twice before replacing an ion chamber. The first thing you should do when a chamber starts to leak is shut down the Javelin and reboot the system. If the leaking is a result of a confused Javelin this wil solve your problem. If the chamber is not physically damaged but is stil counting the second step is using Nitrogin conform Ron's story. If this is still not enough you could follow my advise as described at the start of this e-mail. Good luck! Eric Westaan University Medical Center Utrecht Holland ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Elekta SL25 Ion Chambers Message-ID: <4.1.19991020173343.00957f10@mail.iinet.net.au> From: Ron Kimber To: 'Linac Engineers' Subject: Elekta SL25 Ion Chambers Date: Wed, 20 Oct 1999 02:19:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi fellow Linac slaves. This posting is again on my pet peeve with the SL25. The reliability of ion chambers. To me this is really the only major point on which you could criticise the reliability of the SL. You may remember the issue of the nuts securing the plate stack becoming loose. And the chamber which was returned to service, this was on 23 Feb this year and the chamber is still in use. The next issue which has become apparent is that the chambers are prone to count up (leakage) which appears to mainly affect channel 2 but is not associated with the securing nuts. I presently have three machines which have had chambers which have exhibited this phenomenon but the chambers are still in use!!!! I have no idea exactly what the mechanism is which is causing this but have come up with a novel (and quick) fix. Hopefully this may assist some of you out there to avoid unnecessary ion chamber replacement. To overcome the count up I have blown the area of the connector on the ion chamber with dry nitrogen using a pistol type air gun attached to a nitrogen cylinder through a pressure regulator. By watching the dose rate you can see when you have been successful. This takes about fifteen minutes to complete including removing and replacing the covers. Access is by removing the small shielding piece from the radiation head 90 degrees around from the wedge assembly (this saves removing the wedge assy and inherent need then to check the light field). I think the symptom is most likely due to some condensation on the chamber (I first thought it may have been dust/metal filings) but I have not been able to really confirm it. By using the method above the outage is reduced to about 20-30 minutes (includes quick dose check) replacing the ion chamber would put you out for probably 4 hours minimum if you are good at doing the job and physics is also on the ball. I am not 100% happy to keep an ion chamber in service which has shown any fault symptoms BUT once the chamber has been recovered I have not been able to fault it with any test. There really is no guarantee that a new chamber would be any more reliable. So far we have lost about 3 hours treatment time from "leaky" ion chambers. If the chambers had been replaced we would have at least done 12 hours and spent quite large sums of money on at least three new chambers, presently we have gained a total of some 60 odd weeks of life from our present chambers. I know from a number of colleagues that Elekta are aware in the factory that there is a humidity problem with the ion chambers (I also have heard that they are not the only manufacturer with this weakness). Hopefully Elekta will come up with a cure for the problem but I am not sure of the urgency when profit is to be made from selling more of the same. Our chambers were only lasting on average one year but others I believe are getting a couple of years life (our shortest would have been 8 months on the latest rev. chamber installed most recently!!!!) I still think five years or more is achievable but then that is only my humble opinion. I hope this information may assist SL maintainers to both cut cost and increase up time from their machines. ONE WORD OF WARNING. DO NOT BLOW DIRECTLY ON THE MYLAR OF THE CHAMBERS. I had one totally disintegrate on me. Luckily the chamber was an old chamber I was playing with and the millions of bits of CONDUCTIVE carbon plated mylar did not end up through the radiation head. I would be interested to hear of any experience you may have had with ion chambers and include Siemens and Varian in the discussion if you please. Good luck and good health to you all. Ron Kimber ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: HWFA's Message-ID: From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: HWFA's Date: Tue, 19 Oct 1999 14:45:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just an update, we changed K4 in the modulator which is the Mode B contactor. One we got the old one out it seemed rather intermittent in it's ability to make good contact. The machine "SEEMS" to be fine. I still don't understand why we at times were getting no interlock whatsoever, any opinions are surely welcome. Russ LaPenna E.E.T. Hamilton Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Reverse Diode o/l Message-ID: <99Oct19.115555bst.115220@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: Reverse Diode o/l Date: Tue, 19 Oct 1999 02:56:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Eeeh by 'eck an SL75. Them were the days, when linacs were linacs. Where you could tell things were working 'cos you could see the valves glowing violet as you blasted your eyes with X-rays and when signals went down bits of wire and you could measure them with your AVO meter. When you fixed faults with your soldering iron instead of CTRL+ALT+DEL...................... as my older colleages used to say....... Anyway Paul, back to your RDO problem (if I can remember back that far...) . Have you checked out your RDO detector? It may have suffered a little when you had that pulse cable go short. Particularly all the diodes in RD stack and the input components. By the way, did you replace BOTH pulse cables? If you are SURE that it's OK then it's a case of hanging a dummy load on the o/p of the pulse Xfrmr - 400ohms I think (One that will handle plenty of Watts for a very short period or else it will glow violet along with the valves). If, however, you've replaced the Maggie then I doubt this is the cause of the problem. The next stage would be to substitute pulse Xfrmr with a 25ohm (again, I far as I can remember) load. Problems with the PFN normally cause HT o'loads. Hope this waffle helps! I'd put my money on the RDO detector! Chris Forrest Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100 Controller Faults Message-ID: <0.393e0716.253ca1f8@aol.com> From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: 2100 Controller Faults Date: Mon, 18 Oct 1999 08:16:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank you to all who responded to our weird controller fault. Dave P. hit it right on the button. The problem was target current monitor. Somehow the wire to the target had come off and was getting into something or "building a charge". We saw a sawtooth looking waveform on the scope for target I. After removing the wire and replacing the associated chip on meter interface, the odd waveform is gone and so is the problem. Easy to fix, hard to find! There is a pick off from the monitor panel at the bnc, that goes to the meter interface and then to ADC#1. Again, thank you for your ideas and hope I can be of help in the future. Roger ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Rep rate racing Message-ID: From: Robert Wood To: linac-eng@plato1.aristotle.net Subject: Rep rate racing Date: Fri, 15 Oct 1999 14:21:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a Varian 2100c ser 224. On occasion when beamed on the rep-rate will run up and act like it is unservoed. It doesn't happen often 1 or twice a month but it is disturbing. It happened most recently in 10 x. If allowed to continue to the end of the treatment it will remain high. I have only observed it myself once and that was a long time ago. Just a nagging problem but I would like to get it fixed. Got any ideas? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100 Controller Fault 6x -Reply Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: 2100 Controller Fault 6x -Reply Date: Fri, 15 Oct 1999 12:12:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had this one too a long time ago. It is real easy to solve but an absolute B***** to find. You may notice the target current waveform flakey. This was the hint in our case. The target monitor wire was broken off the target itself. This meant that as you beamed in significant number of electrons (6X) there is a charge building up on the target. Eventually this arcs over to the target wire (the 75 ohm resistor is a little way down the cable) and the spike is sufficiently large to break through the MUX chip and overload the ADC giving CTR interlocks. After refixing the wire all was well. The ADC and mux survived. Hope this solves your probs. Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Comp Filter Mount Trays Message-ID: <3807633E.CE30F576@wfubmc.edu> From: tcullen@wfubmc.edu To: Linac eng Subject: Varian Comp Filter Mount Trays Date: Fri, 15 Oct 1999 09:24:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, I'm trying to track down a vendor who sells trays to fit the Varian comp filter mount. The single tray (yea that's it 1ea) Varian shipped with this unit has the type 3 look and is a little larger (WxL) than the normal polyblock tray. This tray also has four 8-32 heli-coils in the corners to mount the aluminum trays or whatever you use. If anyone, including the Varian reps, has any info as to where I could purchase these I would appreciate it. T I A ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2100 Controller Fault 6x Message-ID: <8525680B.005062C1.00@mail.lrcc.on.ca> From: Randy McVittie To: RSAINC1@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: 2100 Controller Fault 6x Date: Fri, 15 Oct 1999 06:38:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello: We had a similar run of problems with an older 2100 here at London. We looked at a lot of stuff over the years but there was no single source but these two things were done and it has been all quiet ever since. 1. Re-seated all of the boards in the Signal Conditioning backplane and on the STD bus computer. When we did a close comparison between 2 similar vintage 2100C's we also noticed: 2. Changed the loopback voltage dip switches on the DYNC board so that the loopback test is 5v. 3. Moved the DSYNC Board to the same position on the Communications Processor as the 21B It may not work for you but it doesn't take long and it doesn't cost anything in parts. Let me know what you find. Randy McVittie London Regional Cancer Centre. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2100 Controller Fault 6x Message-ID: <38072621.D5F3FFC6@wfubmc.edu> From: tcullen@wfubmc.edu To: Linac eng Subject: Re: 2100 Controller Fault 6x Date: Fri, 15 Oct 1999 05:03:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Roger, ver 2.37hmmm....the three errors you mentioned are probably a better path to take, watchdog timer, 12V PS, or ADC. I think the early versions of SW did not have the HWFA I/L so even if you had a bad pot I believe it would give you the CTRL I/L?? It could have something to do with the 360/180 timing also if it just pops up in 6MV. 6MV uses the 360Hz PRF which would isolate it to that energy. All of these timing signals kinda merge on the control timer pcb. I'm not sure about the ADC but I do know that this pcb would have problems with the mux chips on it from time to time. The one thing to consider is that the timer I/F is also the heart of all these timing signals and would be the most suspect. Possibly the reason for leading you to the modulator also. good luck RSAINC1@aol.com wrote: > Hello Everyone, > I have a 2100c #213 ver 2.37 software giving controller faults in 6x. This > problem has been a bear so far. It seems to be gantry rotational related, at > about 270. > The symptoms are weird. You get the famous beam on then beam off, without > any faults showing. You also get beam on and controller fault, once in > awhile. > It seems to be affected by either pfn and or gun I. If you reduce either, it > will run without any problem (except underdose of course) The diagdump does > not show the same source everytime. Sometimes it's "watchdog timer" , or > "+12 v p/s error", or "ADC error". No faults show other than controller and > the usual faults when you go into standby. We have changed K2, K3, K4, K1 > and aux contacts in Modulator. I have hooked up, externally, all the gantry > windup cables. K8, K9, K12, K13 in Aux. power dist. in Modulator. All other > energies seem to run fine at all gantry angles. Just 6x. Has anyone been > down this road before, or have any ideas. > I'm going to try a different 6x program pcb, and go over all the relays again > in the Modulator. > Thanks, > Roger ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100 Controller Fault 6x Message-ID: <0.6726542d.25381878@aol.com> From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: 2100 Controller Fault 6x Date: Thu, 14 Oct 1999 21:41:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Everyone, I have a 2100c #213 ver 2.37 software giving controller faults in 6x. This problem has been a bear so far. It seems to be gantry rotational related, at about 270. The symptoms are weird. You get the famous beam on then beam off, without any faults showing. You also get beam on and controller fault, once in awhile. It seems to be affected by either pfn and or gun I. If you reduce either, it will run without any problem (except underdose of course) The diagdump does not show the same source everytime. Sometimes it's "watchdog timer" , or "+12 v p/s error", or "ADC error". No faults show other than controller and the usual faults when you go into standby. We have changed K2, K3, K4, K1 and aux contacts in Modulator. I have hooked up, externally, all the gantry windup cables. K8, K9, K12, K13 in Aux. power dist. in Modulator. All other energies seem to run fine at all gantry angles. Just 6x. Has anyone been down this road before, or have any ideas. I'm going to try a different 6x program pcb, and go over all the relays again in the Modulator. Thanks, Roger ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Philips SL75 Reverse Diode Overloads Message-ID: <3806228C.753842C9@Freenet.co.uk> From: Paul Whittard To: linac-eng@plato1.aristotle.net Subject: Philips SL75 Reverse Diode Overloads Date: Thu, 14 Oct 1999 10:35:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Anyone able to help with an RDO problem on a Philips SL75/5 ? We are having persistent RDO errors inhibiting the beam, and sometimes the machine really struggles to get going again. It is frequently tripping out in Vericord mode due to a "Timer" termination as the machine spends so much time with the RF inhibited. This trips may occur during either wedge in or out segments, and do not appear to be gantry angle dependent. The RDO trips are much more common in the afternoon, presumably because something has warmed up. The problem first occurred with a 6 month magnetron. Visual inspection of the modulator area has failed to reveal any obvious component failures or arcing/ burning signs. Outgassing attempts have not improved matters, although with the RDO detector disconnected no change in the modulator tone. (I would expect to hear magnetron mis-fire effects if there was a magnetron problem.) We changed the magnetron for a brand new one anyway, but this has not improved matters. We have monitored various modulator/magnetron wavefroms and all appear OK, and have also analyzed the incoming mains supply for any phase imbalance etc. but again this is all right. We did have a pulse cable failure shortly before this problem appeared (which caused constant RDO fault), so maybe this damaged something in the RF system in a non-obvious way. Any ideas as to how to resolve/proceed with this problem will be gratefully received! Paul Whittard Principal Physicist Royal Berkshire Hospital Reading, UK. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Dr Watsons Message-ID: <99Oct14.112117edt.115641@gateway.healthlink.on.ca> From: "Abbassian, Farhoud" To: 'Paul Twyman' Cc: "AE-LIST (E-mail)" Subject: RE: Dr Watsons Date: Thu, 14 Oct 1999 07:08:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Paul, DRWATSON.EXE is a diagnostic utility that can detect system & application failures and stores data in a file called DRWATSON.LOG. If an error occurs while running an application (i.e. colour application on SL Linacs), specific data from windows is written to the DRWATSON.LOG which can be viewed for debugging purposes - this perhaps can be useful if you are trying to identify the module in the application that causing the problem. Hope this helps, Farhoud Abbassian Princess Margaret Hospital Toronto, Canada > -----Original Message----- > From: Paul Twyman [SMTP:mawm82@[158.43.128.67]] > Sent: Thursday, October 14, 1999 6:50 AM > To: linac-eng@plato1.aristotle.net > Subject: Dr Watsons > > Okay its not April 1st so it must be real and pardon my ignorance but > what is a Dr Watson error message? > Paul Twyman > Technical officer > Medical physics dept > Box 152 > Addenbrookes hosp > Hills road > Cambridge > CB2 2QQ > England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: From: Steve Andrews To: "'linac-eng@plato1.aristotle.net'" Subject: Date: Thu, 14 Oct 1999 05:50:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a customer who is disposing of their Therac 750. If you are interested in acquiring this machine for free please contact me via email at steveandrews@toptions.ioffice.com. Thank You Steve Andrews Technical Options, Inc. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Dr. Watson Message-ID: <99Oct14.143839bst.115205@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: Dr. Watson Date: Thu, 14 Oct 1999 05:38:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Paul, Taken straight from MS help: Dr. Watson for Windows NT is a program error debugger that detects and diagnoses program errors, and then logs the resulting diagnostic information. In the event of a program error, Dr. Watson for Windows NT starts automatically. Technical support personnel then can use the information logged by Dr. Watson to diagnose problems. Chris ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dr Watsons Message-ID: <0.d5796c6f.25373397@aol.com> From: Accelinear@aol.com To: mawm82@[158.43.128.67], linac-eng@plato1.aristotle.net Subject: Re: Dr Watsons Date: Thu, 14 Oct 1999 05:24:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dr. Watson (named for the famed IBM researcher-in fact the whole research complex in Elmsford, NY is named for him) is a computer program that typically runs in the background to report on system errors. It is bundled in DOS and all levels of Windows. Often it is not used in Win 95,98 as it needs to be activated but it is usually always active in WinNT as NT is intended to be extra stable. In general Dr.Watson reports on what was occurring when the system locked. Personal experience has shown that most Dr.Watson reports with NT are usually ram related as NT keeps a very tight control of its ram allocation. The other common cause for Dr. Watson reports is various video card/ driver/ memory conflicts. In 95/98 these are typically labled "page fault error". If I were to guess, and I am, the reported Dr.Watson reports are likely due to ram/motherboard problems though with all the video outputs on the SLi color computer it may just be video memory clashing. I'm not sure if NT4 will help very much for your problem as I have found NT4 to be quite intolerant of hardware defects though it may control the video memory allocation a little better. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1.5.4.16.19991014121628.1f27cda8@mars.tyks.fi> From: Kari Lindberg To: linac-eng@plato1.aristotle.net Subject: Date: Thu, 14 Oct 1999 02:16:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" HI ALL! We have Ximatron CX from 1988 with poor databooks, and now when the machine is loading program from computer, the movement enable monitoring system is halting machine and shows enable error, and while the handpendant and cable are ok. We can use the machine only by disable MEB monitoring. Has anybody had this problem before? Thanks in advance! Kari Lindberg Turku Univ. Hospital Finland ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SL Secondary Access Lockup Message-ID: <99Oct14.093021bst.115203@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: SL Secondary Access Lockup Date: Thu, 14 Oct 1999 00:30:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" With regard to my previous mailing regarding secondary access terminal lockup on Elekta SL linacs, I've had a number of replies both on and off this list. Perhaps I should have been more specific and stated that the problem we have been experiencing is with Serial comms connected terminals and not the UTP networked terminals. However, we too, have also been experiencing "blank screen syndrome" whereby all the text momentarily disappears off the control monitor, leaving only the beige/blue background. (Rel 3.1) We thought that this may be caused by a network problem and that certainly seems to be the case after reading H.de Vroome's mail who states that the more traffic that is on the network, the worse the problem gets. At the moment the only nodes on this network are the Primary PC and Javelin so I expect things may only get worse when another two linacs are connected! Thanks for your responses :-) Chris Forrest Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: SL Sec Access terminal lockup Message-ID: <000001bf15b1$e7ae0780$3d3ee584@henk> From: "H.de Vroome" To: linac-eng@plato1.aristotle.net Subject: RE: SL Sec Access terminal lockup Date: Wed, 13 Oct 1999 11:34:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We where beta-test side for the release 3.0 and Sli upgrade(third photon energy), 2 years ago with colour PC on the primaire and a terminal on the secundary. We had ones a week blue screens or empty beige screens or dr. Watsons. After connection to the local departemental netwerk and/or the connection between MLP and IView it seems to be a little worse. After connection in the large hospital netwerk the linac went down ten times a day, due to broadcast's and polling of the workgroup by curious people. The problem is solved for 99% by placing a bridge between the linac and the rest of the world that only lets through traffic send by linac or MLP. The beige screens disapeared totally after release 3.1. Dr. Watson is a NT3.51 problem and will not been solved untill WindowsNT4 or RTD. > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Whitham, > Richard > Sent: woensdag 13 oktober 1999 17:48 > To: 'Chris FORREST'; linac-eng@plato1.aristotle.net > Subject: RE: SL Sec Access terminal lockup > > > Chris, > > We have been running 3.1 for over two months on four SL25's without any > secondary access problems. Occassional Dr. Watson error message > from colour > computer but that's been random since colour upgrade last year. > > Regards, > Richard BW > Princess Margaret Hospital, > Toronto, Canada > > > > -----Original Message----- > > From: Chris FORREST [SMTP:chrisf@ulth.northy.nhs.uk] > > Sent: Friday, October 01, 1999 9:52 AM > > To: linac-eng@plato1.aristotle.net > > Subject: SL Sec Access terminal lockup > > > > 1) Since Upgrading to 3.1 s/w on our 3 Javelin Based SLs, we've had the > > Sec. Access terminal comms lockup on an intermittent basis. > > The only way to clear it has been to Re-boot Javelin. > > > > Anyone else experienced this phenomenon? > > > > > > > > > > > > Chris Forrest > > Cookridge Hospital > > Leeds UK > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: SL Sec Access terminal lockup Message-ID: <99Oct13.115910edt.115613@gateway.healthlink.on.ca> From: "Whitham, Richard" To: 'Chris FORREST' , linac-eng@plato1.aristotle.net Subject: RE: SL Sec Access terminal lockup Date: Wed, 13 Oct 1999 07:48:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, We have been running 3.1 for over two months on four SL25's without any secondary access problems. Occassional Dr. Watson error message from colour computer but that's been random since colour upgrade last year. Regards, Richard BW Princess Margaret Hospital, Toronto, Canada > -----Original Message----- > From: Chris FORREST [SMTP:chrisf@ulth.northy.nhs.uk] > Sent: Friday, October 01, 1999 9:52 AM > To: linac-eng@plato1.aristotle.net > Subject: SL Sec Access terminal lockup > > 1) Since Upgrading to 3.1 s/w on our 3 Javelin Based SLs, we've had the > Sec. Access terminal comms lockup on an intermittent basis. > The only way to clear it has been to Re-boot Javelin. > > Anyone else experienced this phenomenon? > > > > > > Chris Forrest > Cookridge Hospital > Leeds UK > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mevatron KD2 Message-ID: <9910130450.AA19944@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Cc: Leo Schmidt Subject: Mevatron KD2 Date: Tue, 12 Oct 1999 20:31:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello everybody, And thank you for your replies. No, we were no so stupid and we tried Check#2 manually in service mode :-)) But we definitely overlooked one thing yesterday. It was 24V Reset line. We have not noticed until today that it was pulled high all time. It did not upset the machine at all apart from performing Check#2 routine. Following the line we have found faulty K9 relay in S31. We replaced it and the problem has gone. Following is the WARNING for all KD2 users. At one stage yesterday when we replaced an interlock board we accidentally set an incorrect address on the DIP switch. After that the machine passed Check#2 and was operational in treatment mode. We were ready to release the machine when we noticed that it did not report an interlock correctly. We induced several more interlocks. Some of them were reported others were not. THE WARNING IS: The machine is not completely fool proof as we thought. While the interlock module suffered a major misconfiguration,the machine was not able to detect it and was operational in treatment mode. The good thing is that it was interlocked anyway even if the actual interlock was not reported properly. But how safe was that? Regards, Andrew Frolov Manager, Radiation Engineering Medical Physics Royal Adelaide Hospital Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mevatron KD-2 Message-ID: <199910121659.LAA11153@bunyip.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: linac-eng@plato1.aristotle.net Subject: Re: Mevatron KD-2 Date: Tue, 12 Oct 1999 08:58:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Hi Andrew, > > I've not heard of this particular problem before, but I know that a number > of slave boards (function controller) ------------ snip -------- Andrew, I agree with Will on the possible 2h hang on controller 6. I doubt it's your problem because you've likely thought of it, but I've seen controller 6 hang up with a 2H after being in service mode. After going back to treatment mode, controller 6 fails check 2. After going back into service mode and running a check manually, and confirming that slave 6 clears, treatment mode then works. I'm not sure why the software acts in this manner. I'll be interested in what you find. Regards, Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mevatron KD-2 Message-ID: <001001bf14c9$2fe9d9a0$8c3802c4@will> From: Will Pazda To: Andrew Frolov Cc: linac-eng@plato1.aristotle.net Subject: Re: Mevatron KD-2 Date: Tue, 12 Oct 1999 07:47:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Andrew, I've not heard of this particular problem before, but I know that a number of slave boards (function controllers) were shipped that had PIO chips that were very susceptible to both RF created noise and mains induced noise causing the slave in question to misregister information from the PIO's resulting in interlocks or Check errors. On one of our units we had very strange interlocks / machine states at one time, changing the PIO's with another chip manufacturer (sorry, don't have details, but can get) on all the slave boards solved the problem. One last thing, and I'm sorry to state what may seem obvious (sometimes we get stuck in a problem and forget fundamentals) but did you try running the 'check' test from the service menu. If a check 2 failure happens (often caused by a maggie arc) the 'error' condition remains until you manually run a check test from the service menu to clear the error. The console 'remembers' this error until you clear it in service mode and will prevent Treat mode treatments even with power offs. Good luck, Will ----- Original Message ----- From: Andrew Frolov To: Sent: 12 October 1999 10:13 Subject: Mevatron KD-2 > Hi everyone, > One year of successful battle with the beast has come to an end. > Now we have a fault that does not exist yet the machine is not > operational. Controller 6 would not pass Check#2 with code 2h, which > means dosimetry and pre high rate test has failed. This test consists > of checking status of 6 interlock lines from dosimetry in fault > condition induced by the controller. While checking those lines with > the scope during the check routine we can see all of them being > pulled high (and corresponding LEDs blink). But the controller for > some reason does not recognize it. During normal operation if the > interlocks induced manually (by jumpers) they are recognized and > reported by the controller without any problem. As soon as Check#2 is > bypassed the machine can be beamed on and does not bring up any > interlocks or shows any instability. But it cannot be used for > treatment:-(( Replacement of function controller and all three > interlock boards did not change anything. > We will appreciate any suggestions on this matter. > > Regards, > Andrew Frolov > Manager, Radiation Engineering > Medical Physics > Royal Adelaide Hospital > > Tel: 61 8 8222 5674 > Fax: 61 8 8222 5937 > > email afrolov@mail.rah.sa.gov.au > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mevatron KD-2 Message-ID: <9910120831.AA21174@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Subject: Mevatron KD-2 Date: Tue, 12 Oct 1999 00:13:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi everyone, One year of successful battle with the beast has come to an end. Now we have a fault that does not exist yet the machine is not operational. Controller 6 would not pass Check#2 with code 2h, which means dosimetry and pre high rate test has failed. This test consists of checking status of 6 interlock lines from dosimetry in fault condition induced by the controller. While checking those lines with the scope during the check routine we can see all of them being pulled high (and corresponding LEDs blink). But the controller for some reason does not recognize it. During normal operation if the interlocks induced manually (by jumpers) they are recognized and reported by the controller without any problem. As soon as Check#2 is bypassed the machine can be beamed on and does not bring up any interlocks or shows any instability. But it cannot be used for treatment:-(( Replacement of function controller and all three interlock boards did not change anything. We will appreciate any suggestions on this matter. Regards, Andrew Frolov Manager, Radiation Engineering Medical Physics Royal Adelaide Hospital Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Ion Chambers Message-ID: <199910120611.IAA12078@chimay.radth.ruu.nl> From: Jan Kok To: yorkej@cbhc.ns.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Ion Chambers Date: Mon, 11 Oct 1999 22:11:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good day Jeremy, With an open ionisation chamber the mass of air inside the chamber changes with Pressure and Temperature. This variation can be corrected with the PT correction factor Itp. Itp = ( T / 295.15 K ) X ( 1013.25 mbar / P ) T = measured temperature in Kelvin 295.15 = standard temperature in Kelvin 1013.25 = standard pressure in mbar P = measured pressure in mbar for example: when air pressure changes 10 mbar and temperature remains the same the correction factor is about one percent. hope this helps regards, jan ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Ion Chambers Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6D63@radoncnt1.fccc.edu> From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Cc: "Jeremy Yorke (E-mail)" Subject: FW: Ion Chambers Date: Mon, 11 Oct 1999 11:46:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Jeremy, First of all, how can you attribute your change to an Ion Chamber, if you have not proved it to be faulty? You can test the chamber by using a heat gun or hair dryer to apply a modest amount of heat directly to the chamber. Then run a 100mu. If you see a big difference between mu1 and mu2, after heating the chamber... replace the Chamber. If you do not see a difference I would look back down the line for something else. I would also verify the amount of AC ripple on the 500v dc lines, should be less than 50 millivolts VAC. I have had this problem, and found the chamber to be faulty by the above method. It is a pain in the butt to change the chamber and recalibrate... but... Good Luck to you! Bill Barnes, BSEE Bio Engineer Radiation Oncology Fox Chase Cancer Center Philadelphia, Pa. -----Original Message----- From: Jeremy Yorke [mailto:yorkej@cbhc.ns.ca] Sent: Friday, October 08, 1999 5:12 PM To: 'Linac_Eng' Subject: Ion Chambers Good day all, I have a 2100C/D that has developed a slow leak in its seal which translates to an approx. change in the output calibration (mu's/cgy) of about .3% per day. My questions are, what is the actual pressure within the chamber when they are new? (ie, 2 atmospheres) Has anyone had this problem and if so, once the chamber has completely gone 'flat' what effect does the actual change in barometric pressure have on the output? Thanks Jeremy Jeremy Yorke Electronics Technologist Cape Breton Cancer Centre 1482 George Street Sydney, Nova Scotia Canada B1P 1P3 e-mail: YorkeJ@cbhc.ns.ca (902)567-8000 ext.2163 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Klystron Power Supply Message-ID: <19991011125542.94798.qmail@hotmail.com> From: Tareq Ammer To: LINAC-ENG@plato1.aristotle.net Subject: Klystron Power Supply Date: Mon, 11 Oct 1999 04:55:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Linac Engineers: I have a brand new in a box, a Varian Klystron Power Supply that I am trying to sell. If any one is interested, Please contact me privately. Regards, Tareq ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ion Chambers Message-ID: <86256804.006BF2C1.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Subject: Ion Chambers Date: Fri, 8 Oct 1999 11:30:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Varian pressurizes each of the two chambers in the ion chamber assembly to 2.0 PSIG with CGA TYPE 1, GRADE E air. (Ref Varian dwg 887890, note #6). That's about 1.14 ATM. Good luck with it. tim ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: AW: Ion Chambers Message-ID: From: "Seelentag Wolfhart Dr. KSSG_RO" To: 'Linac_Eng' , "'yorkej@cbhc.ns.ca'" Subject: AW: Ion Chambers Date: Fri, 8 Oct 1999 09:51:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Von: Jeremy Yorke[SMTP:yorkej@cbhc.ns.ca] > Gesendet: Freitag, 8. Oktober 1999 23:12 > An: 'Linac_Eng' > Betreff: Ion Chambers > > Good day all, > > I have a 2100C/D that has developed a slow leak in its seal which > translates to an approx. change in the output calibration (mu's/cgy) of > about .3% per day. My questions are, what is the actual pressure within > the chamber when they are new? (ie, 2 atmospheres) > Not sure how much exactly - but much less. > Has anyone had this problem > Yes :-(. But much less rapid than yours (at the beginning). > and if so, once the chamber has completely gone 'flat' what effect > does the actual change in barometric pressure have on the output? > It will fluctuate with atmospheric pressure - at least for the first time with a very long time constant, but get increasingly more useful as a barometer ;-). > Thanks > Jeremy > Best regards - Wolf -------------- Wolf W. Seelentag, PhD, e-mail : wolf.seelentag@kssg.ch Klinik fuer Radio-Onkologie, Kantonsspital, CH - 9007 St. Gallen, Switzerland Tel : +41-71-4942233 Fax : +41-71-4942893 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ion Chambers Message-ID: <01BF1197.18319620.yorkej@cbhc.ns.ca> From: Jeremy Yorke Reply-To: yorkej@cbhc.ns.ca To: 'Linac_Eng' Subject: Ion Chambers Date: Fri, 8 Oct 1999 13:12:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good day all, I have a 2100C/D that has developed a slow leak in its seal which translates to an approx. change in the output calibration (mu's/cgy) of about .3% per day. My questions are, what is the actual pressure within the chamber when they are new? (ie, 2 atmospheres) Has anyone had this problem and if so, once the chamber has completely gone 'flat' what effect does the actual change in barometric pressure have on the output? Thanks Jeremy Jeremy Yorke Electronics Technologist Cape Breton Cancer Centre 1482 George Street Sydney, Nova Scotia Canada B1P 1P3 e-mail: YorkeJ@cbhc.ns.ca (902)567-8000 ext.2163 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600C: Yield I/L, broken R3 lead Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net Subject: 600C: Yield I/L, broken R3 lead Date: Mon, 4 Oct 1999 09:43:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, We have 600C s/n 311,about 3 1/2 yrs.old, with 953 Beam hrs. Recently the yield servo started hunting between Pos & Neg PFN mismatches. Troubleshooting eventually got to the 3000:1 PFN divider. R3 (a 100 meg ohm) resistor, had a broken bond where one lead attaches to the resistor. The resistor, which is only supported by its leads, stayed in place. There was nothing appearance wise to indicate the resistor had a problem. When I gave a little tug on it, the resistor moved away freely. This broken end is attached to the crow-bar & I suspect vibration was the cause. I've seen this before on the Gun deck of 2100's. If you have a 600C around s/n 311, its probably time to obtain a spare R3. ( # 3169980700 ) Dave Burgess Nova Scotia Cancer Centre Halifax,Canada E-mail: ccwdb@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: SL Sec Access terminal lockup Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net, chrisf@ulth.northy.nhs.uk Subject: Re: SL Sec Access terminal lockup Date: Sun, 3 Oct 1999 22:17:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes lots Chris, but usually the main terminal, replaced Proc 3 last week, and all seems well at the moment. Could also be worth trying a keyboard swap this sometimes causes the sec access to lock. Brian Radiotherapy Physics Poole Hospital >>> "Chris FORREST" 10/01/99 02:52pm >>> 1) Since Upgrading to 3.1 s/w on our 3 Javelin Based SLs, we've had the Sec. Access terminal comms lockup on an intermittent basis. The only way to clear it has been to Re-boot Javelin. Anyone else experienced this phenomenon? Chris Forrest Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Linac Engineer position Perth Australia. Message-ID: <4.1.19991004085726.00951dc0@mail.iinet.net.au> From: Ron Kimber To: linac-eng@plato1.aristotle.net Subject: Linac Engineer position Perth Australia. Date: Sun, 3 Oct 1999 17:47:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A position is available in Perth for a linac engineer with training and experience on Elekta SL and SL75 machines and simulators, computing experience, etc. This is a permanent position and we will assist the successful applicant with residency requirements and relocation. Perth Radiation Oncology Centre runs two private treatment clinics at Wembley and Royal Perth Hospital with a total of five linacs and two simulators. This is an in-house engineering position. Perth is the capital city of Western Australia, with approximately 1.5 million people in the greater metropolitan area. Western Australia is the largest state in Australia and offers many varied lifestyle options and recreational possibilities. The weather is generally mild but can be quite hot and dry for periods in the Summer months. Anyone with interest in this position please email for further details. Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Mobile: 041 993 7776 Fax:61 (0) 8 93814364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SL Sec Access terminal lockup Message-ID: <99Oct1.145218bst.115203@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: SL Sec Access terminal lockup Date: Fri, 1 Oct 1999 05:52:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" 1) Since Upgrading to 3.1 s/w on our 3 Javelin Based SLs, we've had the Sec. Access terminal comms lockup on an intermittent basis. The only way to clear it has been to Re-boot Javelin. Anyone else experienced this phenomenon? Chris Forrest Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Pro-Comm Message-ID: <862567FD.0001A281.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: Pro-Comm Date: Thu, 30 Sep 1999 16:06:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Pro-Comm Inc. 1105 Industrial Pkwy Brick, NJ 08724-2594 (732) 458-3333 (732) 206-0660 FAX 458-1919 This is about two months old. Tim ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Pro-Comm Message-ID: <00BE56E17E26D11197CB00805FA6803A023BB3E6@mail.midcentral.co.nz> From: Keith Croft To: 'Richard Kimball' Cc: 'LinacEng' Subject: RE: Pro-Comm Date: Thu, 30 Sep 1999 14:19:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Fax 908 458 1919 or phone 908 458 3333 or 908 206 0660. This is off the bottom of a letter from them back in '93 when we were looking at getting one. It has been in place since then, apart from a problem right at the start... it has since ran fine ever since. Keith Croft Palmerston North New Zealand. -----Original Message----- From: Richard Kimball [mailto:RKimball@radonc-uc-po.mcis.uchicago.edu] Sent: Friday, October 01, 1999 9:26 AM To: 'Linac Engineer ListServ' Subject: Pro-Comm I need the phone number and or email for Pro-Comm. Anyone have this number handy? Thanks. P.S. Thanks for all the support I received from all of you. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mylar Mirror Message-ID: From: Radsrus@aol.com To: Kerry.Price@advocatehealth.com, linac-eng@plato1.aristotle.net Subject: Re: Mylar Mirror Date: Thu, 30 Sep 1999 12:55:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Kerry, Acceletronics.com sells the mylar mirror (VA# 877388-01) for $32.00 plus shipping. Our item number is 99 9028-00. Feel free to call us at 800-626-8704 or email us at parts@acceletronics.com. Since your so close to our warehouse, feel free to stop by & pick up any parts you need; if your part need is an emergency, we can hand deliver to your door. My Regards, Steve Schwarz, sschwarz@acceletronics.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mylar Mirror Message-ID: <491c2f06.2524d40f@aol.com> From: Virago1100@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Mylar Mirror Date: Thu, 30 Sep 1999 06:56:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Have you tried Acceletronics.com? Jim ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mylar Mirror Message-ID: <000E7F0D.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net Subject: Mylar Mirror Date: Thu, 30 Sep 1999 07:23:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone know a supplier for the mylar mirror that is used in Varian's accelerators? Any help is greatly appreciated! Kerry Price Advocate Health Care Lutheran General Hospital Park Ridge, IL USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: UDRS interlock on Varian 600C Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB49B@liosex1.lio.se> From: Viking Eilert To: 'Radiotherapy Technicians' , "Linac-Eng (E-post)" Subject: SV: UDRS interlock on Varian 600C Date: Thu, 30 Sep 1999 02:19:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable We have the problem on our 600C #5 machine. We can never get ride of = the problem only by reboot the clinac computer. This problem has been on the list before. I answered then and I will do = it again. Varian knows about the problem. I will not answer with the same details as the last time, but shortly Varian told us the problem is a = noise and software bug. It will be fixed hopefully in the next version. In the meantime the most easy way to get ride of the intlk is to beam = on only one monitor unit (1 MU) in FIXED mode (That is what we do). If you don't want to do that, the best way is to reset the STD bus. (But then = you will get 10 minutes time delay). Eilert Viking > -----Ursprungligt meddelande----- > Fr=E5n: Radiotherapy Technicians [SMTP:tex@dial.pipex.com] > Skickat: den 30 september 1999 10:06 > Till: Linac-eng@plato1.aristotle.net > =C4mne: UDRS interlock on Varian 600C >=20 > UDRS INTERLOCK > =20 > We have been getting intermittent UDRS interlocks on our 600C = (c2,serial > no 101,s/w release 5.2 on a PS2 console pc) when an EDW treatment is > set.The interlock appears=20 > before beam on after calcheck but will not clear.The only sure way to > clear it is to reboot. Anyone got any ideas? > =20 > Trevor Buttery > North Staffs Oncology Centre > Stoke-on-Trent > U.K. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: No beam ...got beam? Message-ID: <199909300836.JAA02548@mkoc.demon.co.uk> From: dfenn@mkoc.demon.co.uk To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: No beam ...got beam? Date: Thu, 30 Sep 1999 00:36:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl, You asked me where I got my switches from. Sorry for the long delay, but I have been off the list for a few weeks! The switches are made in Switzerland by Tschudin & Heid and the version with the gold contacts carries their code "serie th25 593564 000" (at least that is what is marked on the switch.) My supplier, here in UK, is Electrospeed and their catalogue number is 63-907963H. Although they are part of the RS group (which is all over the world), they carry a slightly different product range. I phoned them on your behalf and, although they don't have a agency in Canada, they can supply you direct from UK. However, there is a 150 Pound Sterling minimum order charge for normal orders, but if you order via the Internet and use your credit card, there is no minimum surcharge! Their web site has their complete catalogue on line at www.electrospeed.com Good hunting and I hopes this helps! David Fenn Mid Kent Oncology Centre MAIDSTONE Kent ME16 9QQ UK > Got beam! It was the keyswitch. One of the contacts were bad. Thanks for a > ll the help! > > Carl Murphy > Electronics Engineering Technologist > Nova Scotia Cancer Centre > QEII Health Sciences Centre > Halifax, Nova Scotia, Canada > Phone: 902.473.6152 > Fax: 902.473.6120 > Email: ccchm@qe2-hsc.ns.ca > > > > > > > > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: UDRS interlock on Varian 600C Message-ID: <003d01bf0b1a$d55f21a0$1e4d95c1@techoffice> From: Radiotherapy Technicians Reply-To: Radiotherapy Technicians To: Linac-eng@plato1.aristotle.net Subject: UDRS interlock on Varian 600C Date: Thu, 30 Sep 1999 00:06:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" UDRS INTERLOCK We have been getting intermittent UDRS interlocks on our 600C (c2,serial no 101,s/w release 5.2 on a PS2 console pc) when an EDW treatment is set.The interlock appears before beam on after calcheck but will not clear.The only sure way to clear it is to reboot. Anyone got any ideas? Trevor Buttery North Staffs Oncology Centre Stoke-on-Trent U.K. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: come an get it Message-ID: <199909290815.KAA25927@chimay.radth.ruu.nl> From: Jan Kok To: linac-eng@plato1.aristotle.net Subject: come an get it Date: Wed, 29 Sep 1999 00:15:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are now implementing the colour upgrade on our Elekta SLs. For the room monitors we have a B/W tube in spare Type A61-520. Interested? Jan ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Elekta SLi upgrade. Message-ID: <199909271440.JAA03318@plato1.aristotle.net> From: "Vroome, H. de Onco" To: "'Ole@medfys.aau.dk'" , "'linac-eng@plato1.aristotle.net'" Subject: RE: Elekta SLi upgrade. Date: Mon, 27 Sep 1999 06:36:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Update to SLi means integration of MLC, ceramic ionisation monitor chamber, Slitless flighttube, hump driven electron gun in Xmode. This runs version 3.1 software, with external channels, non Philips printers, iCom Fx and Icom Vx. We have this including colour option, witout iCom on our 1996 Sl15 that was intalled as een SLi except the MLCi, We did the MLCi upgrade 1 year later. We ordered the upgrade to RTD and/or Precise on this machine and a SL25 serialnr 007. As far as I now there is a delay in beta testing of the RTD software that will restart mid oktober, so there will be nowbody so far with a clinical released version of the RTD. Comparing the stability of the slit and not slit controlled software I am in favour of the slitless system slit less system. The big advantage of the RTD is the central data server, in that case you don't need ICom functionality anymore but you should rethink the interface with Lantis. Filling the patient database from a workstation ahywhere in the hospital could be a great advantage. ir. Henk de Vroome Dept Clinical Oncology K1-P Leiden Medical University Centre PoBox 9600, 2300 RC Leiden, The Netherlands tel #31 71 526 2914, fax #31 71 526 6760 e-mail H.de Vroome@lumc.nl -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Ole@medfys.aau.dk Sent: Monday, September 27, 1999 4:30 PM To: linac-eng@plato1.aristotle.net Subject: Elekta SLi upgrade. Hi. We are considering an upgrade of Elekta (Philips) SL15 and SL25 to SLi. The machines are installed 1990 & 1992. The upgrade includes RTD (Radiation Therapy Desktop), MLC (multileave), IMRT (Intensity Modulation), iCOM (interface s/w) and some remote diagnostic s/w. The Elekta accelerators and our 2 Siemens accelerators are intended to be interfaced in a LANTIS network. I would like any comments - "Pro et Contra" - on this upgrade like " Is it worth the money ? " "Did the upgrade process ran smoothly ?", "Are you happy with your Sli accelerator ?" Thank you in advance Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_002_01C19966.172FB140 Content-Type: application/octet-stream; name="Vroome, H. de Onco.vcf" Content-Disposition: attachment; filename="Vroome, H. de Onco.vcf" BEGIN:VCARD VERSION:2.1 N:Vroome;H. de Onco FN:Vroome, H. de Onco EMAIL;PREF;MS:DIV2/DIVISIE2/hdvroome REV:19990917T085429Z END:VCARD ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Elekta SLi upgrade. Message-ID: <1F579155162@medfys.aau.dk> From: Ole@medfys.aau.dk To: linac-eng@plato1.aristotle.net Subject: Elekta SLi upgrade. Date: Mon, 27 Sep 1999 06:30:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi. We are considering an upgrade of Elekta (Philips) SL15 and SL25 to SLi. The machines are installed 1990 & 1992. The upgrade includes RTD (Radiation Therapy Desktop), MLC (multileave), IMRT (Intensity Modulation), iCOM (interface s/w) and some remote diagnostic s/w. The Elekta accelerators and our 2 Siemens accelerators are intended to be interfaced in a LANTIS network. I would like any comments - "Pro et Contra" - on this upgrade like " Is it worth the money ? " "Did the upgrade process ran smoothly ?", "Are you happy with your Sli accelerator ?" Thank you in advance Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: HV rectifier diodes Message-ID: <000E09FE.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net, MLancaster@aol.com Subject: Re: HV rectifier diodes Date: Thu, 23 Sep 1999 13:45:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is just a stab in the dark, but check the contacts of K2 in the H.V. contactor assy in the modulator. This is a step-start circuit to limit the inrush current when the machine is beamed on. At BEAMON, K1 pulls in and the inrush current is limited by R1, R2,and R3 until K2 pulls in and takes these resistors out of the circuit a fraction of a second later. I don't know why the same diode keeps breaking down; I suspect that it may have something to do with where it is in the circuit during the inrush current and takes more abuse than the others and breaks down first. Keep us informed of what you find. I'm real curious. Kerry Price Lutheran General Hospital Park Ridge, IL USA ______________________________ Reply Separator _________________________________ Subject: HV rectifier diodes Author: MLancaster@aol.com at PO_EXTERNET Date: 9/23/99 12:50 PM I've been pestered by an intermittent problem on a Varian CL1800 for almost a year now. Starting last October, the machine will periodically blow one of the HV rectifier diodes. Sometimes the machine will run for a month, sometimes 2-3 months, and once it ran for 6 months in between the occurrences. It has now happened 5 times. The machine runs fine with stable tuning normally. The really strange thing is that it always the same diode that shorts (C3) and it always happens at the same time of the day (during morning warm-up while running the first high mode energy, 16E in this case, the third energy they run). It usually happens on a Monday. Usually, the symptoms are the machine simply crashes after @150 MU in that energy with no interlocks or erratic dose rate. Most of the time after the initial crash the machine can be beamed on in a 180 PPS low mode like 9E but not in a 360 PPS low mode, some times it will crash in a low mode and some times it will give a HVOC instead. When it can be beamed on it doesn't produce beam. It always crashes again in a high mode. At various times I have replaced just the diode that was shorted; that one and the one in series with it (C6); the six on the delta side and all 12 at once. One time they were replaced with 5KV diodes because I didn't have any 7.5KV diodes and it ran fine for a week. Both thyratrons have been replaced as well as the modulator PCBs (PFN DeQing Amp, etc.). The line voltage has been monitored and the monitor was connected one time when it crashed. It indicated a 4-5 volt dip on two phases that lasted about .5 seconds at a time that was very close to the initial crash and we have assumed it was at the same time. However, the machine was beamed on 3-4 times after that and either crashed or loaded the line enough to dim the lights and it indicated nothing. We have been through the contactor chain and verified that the max drop to the plate transformer is 1 volt. The line voltage does fluctuate somewhat but not abnormally and it only drops about 2 volts under max load. We have also checked the plate transformer tap switch and gone as far as hard wiring the taps. I have measured both the AC and DC voltages on the secondary of the HV PS and they are very consistent across each diode with a maximum of about 3KV across any diode. So, why does it keep blowing the same diode? And, why does it run fine for months at a time? And, why hasn't it gotten any worse with time? Any ideas? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Varian's Millenium Series MLC Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6D47@radoncnt1.fccc.edu> From: "Barnes, Bill" To: "'Linac-Eng (E-mail)'" Subject: FW: Varian's Millenium Series MLC Date: Thu, 23 Sep 1999 11:56:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, I think you should be commended! You should not be harassed for telling the truth! No company has the right to be big brother and tell us what we can and can not say on this list server! It is public and open to free speech, if they don't like what we say, then we ALL should tell them what they can do with it!!!! Bill Barnes BSEE Fox Chase Cancer Center Philadelphia, Pa. 215-728-2997 -----Original Message----- From: Richard Kimball [mailto:kimball@corecomm.net] Sent: Wednesday, September 22, 1999 8:18 AM To: Linac Engineers Subject: Varian's Millenium Series MLC My apologies to those who monitor the list who took offense to my post of 9/21/99 with the above subject. The statements made could be considered a unique experience and should not be viewed as a general statement of reliability or product design of Varian's Millenium Series MLC. Sincerely, Richard Kimball Senior Engineer Department of Radiation & Cellular Oncology University of Chicago Hospitals 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: HV rectifier diodes Message-ID: <35b425b8.251bc26c@aol.com> From: MLancaster@aol.com To: linac-eng@plato1.aristotle.net Subject: HV rectifier diodes Date: Thu, 23 Sep 1999 09:50:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I've been pestered by an intermittent problem on a Varian CL1800 for almost a year now. Starting last October, the machine will periodically blow one of the HV rectifier diodes. Sometimes the machine will run for a month, sometimes 2-3 months, and once it ran for 6 months in between the occurrences. It has now happened 5 times. The machine runs fine with stable tuning normally. The really strange thing is that it always the same diode that shorts (C3) and it always happens at the same time of the day (during morning warm-up while running the first high mode energy, 16E in this case, the third energy they run). It usually happens on a Monday. Usually, the symptoms are the machine simply crashes after @150 MU in that energy with no interlocks or erratic dose rate. Most of the time after the initial crash the machine can be beamed on in a 180 PPS low mode like 9E but not in a 360 PPS low mode, some times it will crash in a low mode and some times it will give a HVOC instead. When it can be beamed on it doesn't produce beam. It always crashes again in a high mode. At various times I have replaced just the diode that was shorted; that one and the one in series with it (C6); the six on the delta side and all 12 at once. One time they were replaced with 5KV diodes because I didn't have any 7.5KV diodes and it ran fine for a week. Both thyratrons have been replaced as well as the modulator PCBs (PFN DeQing Amp, etc.). The line voltage has been monitored and the monitor was connected one time when it crashed. It indicated a 4-5 volt dip on two phases that lasted about .5 seconds at a time that was very close to the initial crash and we have assumed it was at the same time. However, the machine was beamed on 3-4 times after that and either crashed or loaded the line enough to dim the lights and it indicated nothing. We have been through the contactor chain and verified that the max drop to the plate transformer is 1 volt. The line voltage does fluctuate somewhat but not abnormally and it only drops about 2 volts under max load. We have also checked the plate transformer tap switch and gone as far as hard wiring the taps. I have measured both the AC and DC voltages on the secondary of the HV PS and they are very consistent across each diode with a maximum of about 3KV across any diode. So, why does it keep blowing the same diode? And, why does it run fine for months at a time? And, why hasn't it gotten any worse with time? Any ideas? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian's Millenium Series MLC Message-ID: <99Sep23.124335edt.115637@gateway.healthlink.on.ca> From: "Benvenuto, Richard" To: "'Accelinear@aol.com'" , kimball@corecomm.net, linac-eng@plato1.aristotle.net Subject: RE: Varian's Millenium Series MLC Date: Thu, 23 Sep 1999 08:33:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Marty, Enjoy your comments.... it must cost you. Looking to connect 4 SL's through iCom to Impac version 5 in the near future. What problems have you seen? Richard BW Princess Margaret Hospital Toronto, Canada > -----Original Message----- > From: Accelinear@aol.com [SMTP:Accelinear@aol.com] > Sent: Thursday, September 23, 1999 12:15 AM > To: kimball@corecomm.net; linac-eng@plato1.aristotle.net > Subject: Re: Varian's Millenium Series MLC > > Richard, > While I don't know the reason for your apology for your critique on one > the > newest releases of Varian's products I can say, as one who has received > nastygrams from Varian's attorneys after coments on this BBS, that > regardless > of how comtemptuosly they may treat their customers they loath to have > their > shortcomings viewed in so public a forum. I have no doubt that your good > deed > will not go unpunished. > Truth be told I have received first hand information from a number of > sites > with EX machines that they have been quite unreliable since installation. > They only had 80 leaf multileafs too. Some not making it through a single > week in each of the fist months of operation without downtime. > The bottom line here is that when it comes to multileaf collimators > Varian > probably has the most outdated technology in the industry and as with > their > portal imaging product Varian became so entrenched in it that they just > keep > digging a deeper hole. If not for the credibility derived from the quality > of > the original 2100C (those engineers left years ago to start Impac) the > Varian > products of today would likely be in a much weaker sales position. Varian > typically makes a sale on its name. Sometimes no further cognitive > abilities > are employed in the decision making process. Elekta and Siemens make sales > > when the customer wants the most for its money. > For those who may not know, the Varian multileaf has no roller bearing > surfaces between blades. The hard tungsten is expected to act as a "self > lubricating surface" as it rubs against the adjoining blades. While this > concept is based on engineering principles that predates the invention of > the > wheel sometimes it works fine. Other times one sees one Varian rep > lubricating the leaves because they are sticking and the next day another > rep > has been called to the site and is observed removing said lubricant for > the > same reason. This may go on and off for weeks. I have found this second > scenario to be the more common. > Varian has also made the entire system very cumbersome by only designing > half a system. Then it just doubled the size to make a whole. Instead of a > > single high speed communication line they use two. Instead of designing a > single controller for 80 motors they designed a controller for one motor > and > duplicated it 80 times. The bottom line is that Varian uses a lot of > expensive "stuff" to do a job better suited to many less parts. When they > all > fuction properly it works tolerably well though there ain't much clearence > > for the patient. When they develop problems though, they tend to be > difficult > to fully repair. As a Varian sage once said to me, "it has to get worse > before it can get better" remarking about the tendency of ribbon cables > or > transciever circuits in the mlc to fail when the covers are removed or > replaced during troubleshooting. > I guess what I mean to say is that with Seimens' and Elekta's sales > markedly > improving causing concern as to Varian's bottom line, speaking ill of > thier > recent offering in so public a forum may be ill advised. That is, > professionally speaking. But it does speak so well as to your character! > I wish you well. > By the way. The new Impac interface to the Elekta linac is very sleek. > Definitly post-stoneage design. > > Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: CL1800 / 2100 BMAG interlocks Message-ID: From: "Lapenna, Russ" To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: CL1800 / 2100 BMAG interlocks Date: Thu, 23 Sep 1999 05:18:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > G'day, > > We have a C1 series 2100C (#40) that has had intermittent > (5-10 / week) BMAGs since install. Predominantly in 6x and > portfilm operations. We have spent long hours looking for faults... > > My questions are:- > 1/ Is the 120k resistor a mistake??? > 2/ Does anyone know the history of the change??? > 3/ Does anyone else have this situation (ie 120k instead of > 10k and intermittent BMAGs).??? > > Sorry to be wordy. > Dave. >> No problem, I can't answer your resistor questions but in case it turns out to be a red herring I have an idea for you. I trust that you have checked your shunt voltage values haven't drifted, and that your interlock window values on the bend magnet program board are set up properly. If these are o.k. you may want to try soldering the terminations of your BMag power supply cables if they are of the braided, crimped type. The crimps can build up resistance from oxidation over time and cause BMag faults. We recently did this and it stopped the BMag faults that we were experiencing. Russ LaPenna EET Hamilton Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian's Millenium Series MLC Message-ID: <199909230733.JAA01823@chimay.radth.ruu.nl> From: Jan Kok To: kimball@corecomm.net Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 23:33:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" As this list server is a public medium we can expect that the manufactures are reading all our discussions. It is their right not to react (this list server is not a manufacturers help desk). After being a member of this list for four years I still find it very helpful to read about others problems. It makes me feel not alone when I meet the same problems. The language barrier makes it a bit hard to react or participate to each discussion. This barrier could be even greater when I get the feeling that BIG BROTHER is watching me. I think we have come to the point where we could start a discussion with the manufacturers about participating in this list server. Lets be frank, we love our machines 99% of the time. Only this one percent is discussed here. It is beneficial to the manufacturers to know from this one percent. Could it be possible to have a response from them lets say ones a month, keeping us informed about upgrades or modifications? Jan Kok ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian's Millenium Series MLC Message-ID: <5bc710d8.251b0330@aol.com> From: Accelinear@aol.com To: kimball@corecomm.net, linac-eng@plato1.aristotle.net Subject: Re: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 20:14:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, While I don't know the reason for your apology for your critique on one the newest releases of Varian's products I can say, as one who has received nastygrams from Varian's attorneys after coments on this BBS, that regardless of how comtemptuosly they may treat their customers they loath to have their shortcomings viewed in so public a forum. I have no doubt that your good deed will not go unpunished. Truth be told I have received first hand information from a number of sites with EX machines that they have been quite unreliable since installation. They only had 80 leaf multileafs too. Some not making it through a single week in each of the fist months of operation without downtime. The bottom line here is that when it comes to multileaf collimators Varian probably has the most outdated technology in the industry and as with their portal imaging product Varian became so entrenched in it that they just keep digging a deeper hole. If not for the credibility derived from the quality of the original 2100C (those engineers left years ago to start Impac) the Varian products of today would likely be in a much weaker sales position. Varian typically makes a sale on its name. Sometimes no further cognitive abilities are employed in the decision making process. Elekta and Siemens make sales when the customer wants the most for its money. For those who may not know, the Varian multileaf has no roller bearing surfaces between blades. The hard tungsten is expected to act as a "self lubricating surface" as it rubs against the adjoining blades. While this concept is based on engineering principles that predates the invention of the wheel sometimes it works fine. Other times one sees one Varian rep lubricating the leaves because they are sticking and the next day another rep has been called to the site and is observed removing said lubricant for the same reason. This may go on and off for weeks. I have found this second scenario to be the more common. Varian has also made the entire system very cumbersome by only designing half a system. Then it just doubled the size to make a whole. Instead of a single high speed communication line they use two. Instead of designing a single controller for 80 motors they designed a controller for one motor and duplicated it 80 times. The bottom line is that Varian uses a lot of expensive "stuff" to do a job better suited to many less parts. When they all fuction properly it works tolerably well though there ain't much clearence for the patient. When they develop problems though, they tend to be difficult to fully repair. As a Varian sage once said to me, "it has to get worse before it can get better" remarking about the tendency of ribbon cables or transciever circuits in the mlc to fail when the covers are removed or replaced during troubleshooting. I guess what I mean to say is that with Seimens' and Elekta's sales markedly improving causing concern as to Varian's bottom line, speaking ill of thier recent offering in so public a forum may be ill advised. That is, professionally speaking. But it does speak so well as to your character! I wish you well. By the way. The new Impac interface to the Elekta linac is very sleek. Definitly post-stoneage design. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian's Millenium Series MLC Message-ID: <5bc710d8.251b0330@aol.com> From: Accelinear@aol.com To: kimball@corecomm.net, linac-eng@plato1.aristotle.net Subject: Re: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 20:14:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, While I don't know the reason for your apology for your critique on one the newest releases of Varian's products I can say, as one who has received nastygrams from Varian's attorneys after coments on this BBS, that regardless of how comtemptuosly they may treat their customers they loath to have their shortcomings viewed in so public a forum. I have no doubt that your good deed will not go unpunished. Truth be told I have received first hand information from a number of sites with EX machines that they have been quite unreliable since installation. They only had 80 leaf multileafs too. Some not making it through a single week in each of the fist months of operation without downtime. The bottom line here is that when it comes to multileaf collimators Varian probably has the most outdated technology in the industry and as with their portal imaging product Varian became so entrenched in it that they just keep digging a deeper hole. If not for the credibility derived from the quality of the original 2100C (those engineers left years ago to start Impac) the Varian products of today would likely be in a much weaker sales position. Varian typically makes a sale on its name. Sometimes no further cognitive abilities are employed in the decision making process. Elekta and Siemens make sales when the customer wants the most for its money. For those who may not know, the Varian multileaf has no roller bearing surfaces between blades. The hard tungsten is expected to act as a "self lubricating surface" as it rubs against the adjoining blades. While this concept is based on engineering principles that predates the invention of the wheel sometimes it works fine. Other times one sees one Varian rep lubricating the leaves because they are sticking and the next day another rep has been called to the site and is observed removing said lubricant for the same reason. This may go on and off for weeks. I have found this second scenario to be the more common. Varian has also made the entire system very cumbersome by only designing half a system. Then it just doubled the size to make a whole. Instead of a single high speed communication line they use two. Instead of designing a single controller for 80 motors they designed a controller for one motor and duplicated it 80 times. The bottom line is that Varian uses a lot of expensive "stuff" to do a job better suited to many less parts. When they all fuction properly it works tolerably well though there ain't much clearence for the patient. When they develop problems though, they tend to be difficult to fully repair. As a Varian sage once said to me, "it has to get worse before it can get better" remarking about the tendency of ribbon cables or transciever circuits in the mlc to fail when the covers are removed or replaced during troubleshooting. I guess what I mean to say is that with Seimens' and Elekta's sales markedly improving causing concern as to Varian's bottom line, speaking ill of thier recent offering in so public a forum may be ill advised. That is, professionally speaking. But it does speak so well as to your character! I wish you well. By the way. The new Impac interface to the Elekta linac is very sleek. Definitly post-stoneage design. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Varian's Millenium Series MLC Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6D46@radoncnt1.fccc.edu> From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: FW: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 14:50:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, I think you should be commended! You should not be harassed for telling the truth! No company has the right to be big brother and tell us what we can and can not say on this list server! It is public and open to free speech, if they don't like what we say, then we ALL should tell them what they can do with it!!!! Bill Barnes BSEE Fox Chase Cancer Center Philadelphia, Pa. 215-728-2997 -----Original Message----- From: Richard Kimball [mailto:kimball@corecomm.net] Sent: Wednesday, September 22, 1999 8:18 AM To: Linac Engineers Subject: Varian's Millenium Series MLC My apologies to those who monitor the list who took offense to my post of 9/21/99 with the above subject. The statements made could be considered a unique experience and should not be viewed as a general statement of reliability or product design of Varian's Millenium Series MLC. Sincerely, Richard Kimball Senior Engineer Department of Radiation & Cellular Oncology University of Chicago Hospitals 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Varian's Millenium Series MLC Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6D46@radoncnt1.fccc.edu> From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: FW: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 14:50:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, I think you should be commended! You should not be harassed for telling the truth! No company has the right to be big brother and tell us what we can and can not say on this list server! It is public and open to free speech, if they don't like what we say, then we ALL should tell them what they can do with it!!!! Bill Barnes BSEE Fox Chase Cancer Center Philadelphia, Pa. 215-728-2997 -----Original Message----- From: Richard Kimball [mailto:kimball@corecomm.net] Sent: Wednesday, September 22, 1999 8:18 AM To: Linac Engineers Subject: Varian's Millenium Series MLC My apologies to those who monitor the list who took offense to my post of 9/21/99 with the above subject. The statements made could be considered a unique experience and should not be viewed as a general statement of reliability or product design of Varian's Millenium Series MLC. Sincerely, Richard Kimball Senior Engineer Department of Radiation & Cellular Oncology University of Chicago Hospitals 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: CL1800 / 2100 BMAG interlocks Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: CL1800 / 2100 BMAG interlocks Date: Wed, 22 Sep 1999 14:23:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, We have a C1 series 2100C (#40) that has had intermittent (5-10 / week) BMAGs since install. Predominantly in 6x and portfilm operations. We have spent long hours looking for faults... Last night (only about 19:00) we noted a resistor on the interlock board that is a different value to the ccts. I have been here since the machine install and am certain that resistor was not changed on site. The resistor details are R37 area 10C on cct 837611 of 2100 (Ithink late 1800 as well). Was 120k - should be 10k. This is similar to R16 area 8C on 884611. Is 1k. In all 3 cases the circuit is a standard window comparitor with the window being 100k (49.9k+49.9k) as a proportion of the total string resistance: Our old one 120k + 100k + 909k = 1.129M As per book 10k + 100k + 909k = 1.019M Later revision board 1k +100k + 909k = 1.010M The window proportions became larger with later revisions of the board ! ! My questions are:- 1/ Is the 120k resistor a mistake??? 2/ Does anyone know the history of the change??? 3/ Does anyone else have this situation (ie 120k instead of 10k and intermittent BMAGs).??? Sorry to be wordy. Dave. ************************************ It's only a game, only a game, I'm muttering under my breath, Only a game, only a game. Like dying is only death. Tom Paxton. ************************************* ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 600CD yield faults finale Message-ID: <852567F4.0074C416.00@mail.lrcc.on.ca> From: Bob Tonks To: twaldron@mail.mdacc.tmc.edu, linac-eng@plato1.aristotle.net Subject: Re: 600CD yield faults finale Date: Wed, 22 Sep 1999 13:15:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We a similar problem with our 600C. Our HVPSI pulse was fairly stable but our MAG I pulse would get worse as the dose rate was increased. It took a bit of work but I guess that the machine runs at 125HZ during morning warmup and calculates a dose per pulse from this which is used to setup a calculated PRF so the machine can run at 250MU per Min. The dose rate servo shuts off pulses completely in order to maintain dose rate which in turn changes the Charge on the charging choke and the amount of time before the DeQ fires. The problem with our machine was that C4 on the PFN DeQ AMPL board was a 2200pF capacitor from the factory and would average the deq level to much. We replaced the cap with a 22pF cap on the advice from Kurt in Calgary and our machine would DeQ properly. Our MAG I pulses are now stable in all rep rates. Sorry to be so long winded but it was a nice solution to a real headache. Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: K2 Step Start relay - 2100C Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net Subject: K2 Step Start relay - 2100C Date: Wed, 22 Sep 1999 11:52:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All, I just want to send along a little information regarding the K2 step start relay and its lifespan. We have 2100C s/n 708 installed in early 95. For the last several months I noticed while in Service Mode and with Dose servo's off ,the unservoed Dose Rate would change from one Beam ON to another. This change was about 10%. However in Clinical Mode with servoes on, the unit ran reasonably well. Occasionally an underdose interlock would occur, usually on Beam On . I decided to check the Step Start ( K2 ) on the HV contact assy. All 3 poles were extensively deteriorated, the contact pads were almost gone,and lots of carbon . The unit has 847 Beam On hours. Probably a typical lifespan for K2 is about 800 hours, we went too long. K2 is a Potter & Brumfield # P40C42A12D1-120 . Upon replacement of K2, RR3's unservoed rate went from 270 to 385 on e energies and about 305 on x energies. GUN I and PFN V were both cut back to restore 270. I checked K1, I think it's got about another 100 hours left. I had expected 6 to 8 years out of K2, but know I've a guide line. I hope this info will benefit some of you. Dave Burgess Nova Scotia Cancer Centre Halifax,NS Canada E-mail: ccwdb@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD yield faults finale Message-ID: <862567F4.0066B4E0.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: 600CD yield faults finale Date: Wed, 22 Sep 1999 10:30:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Our 600Cs, SN 012 (1989) and SN 075 (1990) both exhibit the PFN V instability above rep rate 3, and we always thought it was a power problem, until we recently moved the machines to a newly built facility and observed the same thing. I wonder if the line filter on the primary (K1) line is acting as a current limiter. This just makes it alot more important to do beam measurements, and afc and and yield servo alignment in the clincally-used rep rate on these machines. When this was first observed, alot of things got replaced trying to address the problem (maggies, diodes, thyratrons, etc.). We didn't replace the PFN cap and coils, the charge choke, the HV filter caps or the plate transformer, but I think everything else in the circuit got changed out at one point or another without really getting rid of this behavior. I DO know that a bad contact in K1 will make the instability alot worse, but it will still be stable at low rep rates (truly a case of charge cycle being current-limited). I hope this helps. Much as I hate problems that I have to "live with", this one has sort of fallen into that category. Regards Tim Waldron ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD yield faults finale Message-ID: From: "Nelson, Steve" To: 'Linac Engineers' Subject: 600CD yield faults finale Date: Wed, 22 Sep 1999 09:25:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello again group, If you remember from the last episode of the intermittent yield gremlin, the Varian folks had searched and searched. One of the green lizard shirts finally showed that when the coil which is series with the main thyratron (to slow down the discharge of the PFN) was removed from the circuit, "the problem" went away After posting that episode, some concern was generated regarding the leading edge spike on the maggie pulse. It was then decided and agreed upon to try half of the coil in circuit. This reduced the leading edge overshoot from about 140 A to a comfortable 120 A . And guess what! "The problem" did not come back. The machine runs like a clock at rep rate three. Above that rate, it seems that the HVPS can't charge the PFN fast enough on successive pulses, so that the DQ point tends to shift over and dither about. The PFN V remains stable though. Has anyone else seen this? regards, Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 843-792-3271 nelson@radonc.musc.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian's Millenium Series MLC Message-ID: <003401bf0520$27c3d0e0$6db259c3@stuart> From: Stuart E Vessey Reply-To: Stuart E Vessey To: 'Richard Kimball' , Linac Engineers Subject: Re: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 09:30:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I guess that the lawyers from Varian have been on your case Richard. Please feel free to keep us informed of any faults (and cures) that you find. General comments about reliability and support effectiveness from any supplier are very welcome, as they give a true (ie not salesspeak) picture of an organisation. Remember - if it's true it cannot be libel!!!!!!!!! Stuart ----- Original Message ----- From: Williams, Rod To: 'Richard Kimball' ; Linac Engineers Sent: Wednesday, September 22, 1999 4:08 PM Subject: RE: Varian's Millenium Series MLC ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian's Millenium Series MLC Message-ID: <4.1.19990922090319.00932800@radonc17.ucsf.edu> From: John Somers To: Richard Kimball , Linac Engineers Subject: Re: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 05:07:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 07:18 AM 9/22/99 -0500, Richard Kimball wrote: >My apologies to those who monitor the list who took offense >to my post of 9/21/99 with the above subject. >The statements made could be considered a unique experience >and should not be viewed as a general statement of >reliability or product design of Varian's Millenium Series >MLC. > > >Sincerely, >Richard Kimball >Senior Engineer >Department of Radiation & Cellular Oncology >University of Chicago Hospitals >773.702.6879 > > > Richard, I think you are to be commended for the forthright, honest sharing of information in your original post. I don't see the need for any apology. Factual information is very helpful to the rest of us, and we surely don't get that from the manufacturers. I know firsthand how heavily they massage and put a spin on what they tell the customer. Thanks, my hat is off to you. Sincerely, John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian's Millenium Series MLC Message-ID: <37E8F9D3.7CC5A538@wfubmc.edu> From: tcullen@wfubmc.edu To: Richard Kimball Cc: Linac Engineers Subject: Re: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 07:46:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, I'm not so sure I'm following you on this apology thing. If it has come to the point where the facilities we work for are dropping down huge sums of money on equipment that doesn't meet promises/expectations, and we have to resort to apologizing for the truth, something is wrong here. You did say you were out of beta testing and that there are still real reliability issues with your unit, right? The company still plans to sell like products Who should be doing the apologizing and fixin'? I take this type of information seriously and if you meant it don't apologize for it. What I worry about is the facilities/engineers that just suck it up and live with it. Richard Kimball wrote: > My apologies to those who monitor the list who took offense > to my post of 9/21/99 with the above subject. > The statements made could be considered a unique experience > and should not be viewed as a general statement of > reliability or product design of Varian's Millenium Series > MLC. > > Sincerely, > Richard Kimball > Senior Engineer > Department of Radiation & Cellular Oncology > University of Chicago Hospitals > 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian's Millenium Series MLC Message-ID: From: "Williams, Rod" To: 'Richard Kimball' , Linac Engineers Subject: RE: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 07:08:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Richard Kimball [SMTP:kimball@corecomm.net] Sent: Wednesday, September 22, 1999 6:18 AM To: Linac Engineers Subject: Varian's Millenium Series MLC My apologies to those who monitor the list who took offense to my post of 9/21/99 with the above subject. The statements made could be considered a unique experience and should not be viewed as a general statement of reliability or product design of Varian's Millenium Series MLC. Sincerely, Richard Kimball Senior Engineer Department of Radiation & Cellular Oncology University of Chicago Hospitals 773.702. Good morning Richard, I found your opinion on the M.L.C. 120 to be interesting, we to have gone though the upgrades on the 120 as we have s/n 8 while their has been many hours spent on the changes we have had only three hours downtime in the last 2 months, I can only hope that our uptime stays as good as it is or gets better, I will keep the group posted on weird problems. Rod Williams Waukesha Memorial Hospital 414-896-4734 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian's Millenium Series MLC Message-ID: <001501bf04f4$8f9fa940$aac6d6d8@whoknows> From: Richard Kimball To: Linac Engineers Subject: Varian's Millenium Series MLC Date: Wed, 22 Sep 1999 04:18:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My apologies to those who monitor the list who took offense to my post of 9/21/99 with the above subject. The statements made could be considered a unique experience and should not be viewed as a general statement of reliability or product design of Varian's Millenium Series MLC. Sincerely, Richard Kimball Senior Engineer Department of Radiation & Cellular Oncology University of Chicago Hospitals 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Plotting of SL linac signals Message-ID: <4510ED9293BFD1119D280008C7280D620283BBBB@ex1.gstt.sthames.nhs.uk> From: Stuart.Vessey@gstt.sthames.nhs.uk To: PWong@bccancer.bc.ca, f.fanselow@rtil.nl Cc: linac-eng@plato1.aristotle.net Subject: RE: Plotting of SL linac signals Date: Tue, 21 Sep 1999 08:16:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Right - a quick run down of the software used in the Elekta Factory for systems test (when I left there - August 98). Wellhofer(sp?) water phantom plotting software (controls the buddelship phantom) - basically an off-the-shelf product from Wellhofer which has been adapted for the Elekta Factory requirements. Autotest - developed by Wellhofer for Elekta this is used to setup the machine (sets such things as initial beam parameters, steering tables etc). Again this uses the buddelship water phantom. C-Plot - Developed in-house by Elekta to do all the plots normally associated with the X-Y plotter, does not use the buddelship phantom, but will do all the Mag Tuner / Dose Rate type plots etc. All the above software uses a dongle (so you can't take a sneaky copy to use without one). Hope this clears things up Regards Stuart E Vessey Medical Technical Officer Guys' and St Thomas' NHS Trust ___________________________________________________ Any views stated in this email are my own, and are not to be interpreted as being those of the Trust unless specifically stated otherwise. ___________________________________________________ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Orthovoltage - Therapax vs Gulmay Message-ID: <852567F3.0055B46A.00@mail.wrcc.on.ca> From: Sheldon Chippett To: linac-eng@plato1.aristotle.net Subject: Orthovoltage - Therapax vs Gulmay Date: Tue, 21 Sep 1999 08:10:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are in the process of selecting an orhtovoltage unit for our new cancer centre. Basically, we have to choose between the Therapax DXT 300 and the Gulmay D3300. Anyone have any good/bad things to say about these units or the manufacturers? Thanks in advance. Sheldon Chippett Electronics Technologist Windsor Regional Cancer Centre Windsor, Ontario Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: VARIAN MILLENNIUM 120 MLC Message-ID: <9ABDF423D257D211AFE800104B413D0B0B5DBC@GALILEO> From: Robert Hutchings To: "'linac-eng@plato1.aristotle.net'" Subject: VARIAN MILLENNIUM 120 MLC Date: Tue, 21 Sep 1999 06:49:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I only joined the list today so might have missed any previous discussions on the above. I have however been handed a copy of Richard Kimball's very informative email of September 21. We are considering the 120 MLC as a compromise between micro MLC and the 80 leaf version for our Varian 600C. The justification was the inner 20 x 20cm having 0.5cm leaf projections as opposed to 1.0cm normally and there is no need to fit / remove the unit between other treatments. This makes it an attractive choice for anyone in our situation who is looking for something close to microleaf capabilities and standard conformal requirements. I appreciate Richard's comment that he might settle for a standard 80 leaf but in our case it would take us a long way from the microleaf spec. I wonder if anyone could update me with any further information such as: How many 120 MLC's are there in clinical use (and where); how long does it take to install, (the Varian sales rep say's two days); how many hours would you allow for commissioning; and what would you expect to pay for one. Does $430,000 seem over the top? Any information would be very much appreciated. Many thanks in anticipation, Robert Hutchings MBA Technical Services Manager Radiotherapy Physics Norfolk & Norwich Hospital Norwich NR1 3SR UK. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: In-house Engineer position Message-ID: From: BMic644@aol.com To: howdal@mindspring.com, linac-eng@plato1.aristotle.net Subject: Re: In-house Engineer position Date: Tue, 21 Sep 1999 05:46:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Job position with Saint Barnabas Health Care Systems in Livingston, NJ. We have 5 centers with the following equipment: Siemens KD2, Siemens 5800, Varian 6/100, Philips SL75, Varian 2100c, (4) Siemens Primus systems, Siemens MD2, Varian 600c, Philips simulator, Siemens Mevasim, Oldelft simulator. We are in the process of setting up an in-house service system. I have over 20 years experience in supervising service engineers in the in-house area. Our pay and benefits are very competitive. Obviously, I am looking for someone with several years of experience especially with Siemens digital equipment. Travel requirements would be to our clinics in the NJ area which means you should be able to get home every evening. Barry Michael Director of Rad Onc Engineering St. Barnabas Health Care Systems/Livingston Technologies 908-238-1231 BMic644@aol.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian's Millenium Series MLC Message-ID: <002901bf0422$f3274720$cdc6d6d8@whoknows> From: Richard Kimball To: Linac Engineers Subject: Varian's Millenium Series MLC Date: Tue, 21 Sep 1999 03:17:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" As a participant in a community of service engineers for repair of linear accelerators, this post is simply meant as information. Early on, when our BETA test Millenium series 120 MLC was installed, we had problems. Of course we had problems, it was a beta test unit. The manufacturer was clearly working towards resolving issues at hand. Through close communication between service staff and production engineers, many issues were resolved. We have been out of beta test for several months, and the Millenium series MLC is now shipping as a production unit, hence an earlier post from me offering information on this new technology as an in-house engineer. I can say, honestly, that after 7 months of attempting to resolve reliability issues, our 120 MLC has not had two days in a row where it didn't give us some kind of trouble. We, nor Varian has been able to thus far satisfy minimum uptime requirements. Varian seems to have missed the mark for this design. I have made some comments to others privately that I felt the Millenium series 'had the potential' of being a truly superior product. I still feel this way. But after 7 months of constant work and considerable aggravation with this product, I feel a note to others is overdue. If I was in an institution that was expecting delivery of this series of MLC, and I knew what I know now, I would stop its' installation and request a conventional Mark series (CR) 80 leaf. Of the 2 1/2 years of operational experience with our 80, our IMRT program is running great with no repairs other than periodic planned maintenance. I wish I had a nickel for every hour of troubleshooting and repair of the 120 MLC. I would be a rich man. Of note is that the Millenium series is what is at issue, beit a 52, 80 or 120 leaf design. Another serious issue that exists is that the spares kit has been reduced considerably for the Millenium series. Considering that the new head power supply alone cost over $2,400, and that many parts are no longer interchangeable from side to side, leaves a budgeting issue too! I speak not on behalf of my institution, merely as a service engineer who is salaried (read-not paid overtime), tired of putting in untold hours without compensation or appreciation and is extremely tired of fighting with something that just isn't getting any better. Sincerely, Richard Kimball Senior Engineer University of Chicago Hospitals 773.702.6879 P.S. To those at Varian who monitor this list, please exclude my name from any referral list that may exist. I can't endorse something that doesn't work and am growing tired of the attitude from out West. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: (Fwd) Re: (Fwd) Re: FW: Mevatron - creeping gantry Message-ID: <9909210455.AB12807@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Subject: (Fwd) Re: (Fwd) Re: FW: Mevatron - creeping gantry Date: Mon, 20 Sep 1999 20:36:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ------- Forwarded message follows ------- From: Andrew Frolov To: acceltek@flash.net Subject: Re: (Fwd) Re: FW: Mevatron - creeping gantry Date sent: Tue, 21 Sep 1999 13:16:48 +0930 Thank you, Thomas. It was not really hard. I just monitored that voltage on the neutral while turning off the systems one by one with circuit breakers until it disappeared. It was much harder to locate that blown varistor in the injector because it did not cause any trouble to the injector itself and you can not easily isolate systems in there. Altogether it took us about 7 hours to fix the problem. Although 2 hours we lost because while putting PC1 back into the machine we accidentally knocked the wiper brush out of T1 without noticing it. Fortunately we managed to find it later inside the machine. Regards, ------- End of forwarded message ------- Andrew Frolov Manager, Radiation Engineering Medical Physics Royal Adelaide Hospital Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: (Fwd) Re: FW: Mevatron - creeping gantry Message-ID: <199909210237.VAA13817@ogopogo.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: Andrew Frolov , linac-eng@plato1.aristotle.net Subject: Re: (Fwd) Re: FW: Mevatron - creeping gantry Date: Mon, 20 Sep 1999 18:36:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Hello everyone, > > This is the message to anybody interested in the development of what > was posted by David Horsman last Friday. Enjoy > > ------- Forwarded message follows ------- > From: Andrew Frolov > To: Leo Schmidt > Subject: Re: FW: Mevatron - creeping gantry > Date sent: Tue, 21 Sep 1999 09:46:58 +0930 > > Hi Leo, > > We fixed the fault yesterday (just another one). As I said it was due > to 111VAC on neutral in reference to the ground. This induced voltage > was due to shorted varistor on the Injector PC1 board. There are two > varistors on the wiper of T1. The one that connected to the ground > (why if the ground is not a reference for the main AC voltages?) was > short. This introduced a low impedance between one of the phases and > the ground. As the impedance between neutral and the ground remained > high (the machine is isolated from the mains neutral and ground by > step down transformer) some 111VAC was induced onto ground line. This > voltage was upsetting the tachometer differential amplifier that > introduced a tiny 0.1VDC offset on its output which was compensated > by the servo loop driving gantry at a very low speed. Afterall when > we replaced the varistor 111Vac have gone from the neutral and gantry > was not creeping any more. By the way this fault also induced some AC > on temperature signals. Temperature readouts were erratic although > mainly within the interlock window. Now they are stable as usual. > This is another example on how a breakdown in one system makes > another one malfunctioning. > > Regards, > > A.Frolov > > > ------- End of forwarded message ------- > > > > Andrew Frolov > Manager, Radiation Engineering > Medical Physics > Royal Adelaide Hospital > > Tel: 61 8 8222 5674 > Fax: 61 8 8222 5937 > > email afrolov@mail.rah.sa.gov.au > Good troubleshooting! How did you trace it to the injector? Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: In-house Engineer position Message-ID: <22ae9d07.251824e4@aol.com> From: BMic644@aol.com To: linac-eng@plato1.aristotle.net Subject: In-house Engineer position Date: Mon, 20 Sep 1999 16:01:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For you interested service engineers, we have a job opening with the Saint Barnabas Medical Center in Livingston, NJ. We have 5 centers with a total of 11 Linacs plus simulators. If you have any interest, contact me directly and we can discuss this further. Barry Michael BMic644@aol.com 908-238-1231 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: acceletronics.com online parts database Message-ID: <000501bf0384$539b0d20$58a8a798@pwserver> From: Steve Schwarz To: linac-eng@plato1.aristotle.net Subject: acceletronics.com online parts database Date: Mon, 20 Sep 1999 08:22:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all responsible for the maintenance of Radiotherapy equipment, Thank you for the positive responses regarding the Acceletronics.com online parts database. We have signed up over 40 new clinics, institutions, ISO's and asset managers so far and are very pleased to be able to provide this easy to use database for your parts research and procurement needs. If you would like access to our online parts database and you haven't signed up yet, please email us at parts@acceletronics.com or call us at 1-800-626-8704 for your personal ID and password. Our parts database can be accessed around the clock at www.acceletronics.com , then clicking on the "login to parts database" hyperlink. Our goal is to provide you with the finest and most cost effective service support available; if you have any suggestions how we can make the system better for you, please let us know. Thank You for your very positive support and if there is anything we can do for you, please do not hesitate to contact us. We look forward to serving you. My Regards, Steve Schwarz, sschwarz@acceletronics.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mevatron - creeping gantry Message-ID: <199909171607.LAA06692@chupacabras.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: David Horsman , linac-eng@plato1.aristotle.net Subject: Re: Mevatron - creeping gantry Date: Fri, 17 Sep 1999 08:06:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Hello all, > > I have a KD2 Mevatron with a gantry that creeps slowly whenever > the deadman switches are depressed. I have not investigated this > in depth due to lack of access to the linac, but I have noticed that > the gantry motor lines and tachometer signals float at 110 VAC. > > Has anybody else noticed this? Is it normal? If not, are there any > suggestions as to how 110 VAC could get onto the motor lines and > tacho signals? > > By the way. The gantry motor is a DC motor controlled by a > Polyspede controller. > > Thanks in advance. > > David Horsman > dhorsman@cancer.rah.sa.gov.au > Royal Adelaide Hospital > Ph 08 8222 4188 > Fx 08 8222 5937 > David, I have not seen this problem on a dash-2 (yet), but I have seen it a few times on a conventional, and the setup/wiring is very similar. A couple of things to check: 1. No motor drive voltage can get from the polyspeed board to the polyspeed motor unless the big DPDT relay S32 K1, is on. This requires a Gantry relay En signal from the gantry control pcb. I'm not certain of this, but I don't think you should get this signal with only the deadman on the HC depressed (unless you have it setup to rotate the gantry). I have seen the large relay K1 get old and magnetized, and not drop out when it has no coil voltage. Make sure relay K1 drops out when it should. 2. Even if the relay K1 is on, you should have almost zero volts drive to the polyspeed motor until the Mevatron sends motor drive signals, ( direction and speed), to The polyspeed board. There are some zero pots on the polyspeed control board that zero the SCR drive circuits. These are almost certainly not zeroed (even if you have an additional problem with K1). Check on schematic 94-00- 573 'Interconnection Gantry Assy - S32'. It has a pretty fair interconnect of all this and also some zeroing instructions for the polyspeed board. You should also have a polyspeed manual with your documentation set. This gives more detail on the zeroing of the SCR's also. Hope this helps. Regards, Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Plotting of SL linac signals Message-ID: From: Patrick Wong To: 'Fred Fanselow' Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: Plotting of SL linac signals Date: Fri, 17 Sep 1999 07:35:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Fred, I have seen this software when I was attended the SL training course (1995) in Crawley. The software ( named Diaglin) was developed by Philips Medical System in Germany and written in Germany language. It was brought in by one of the Philips service guy from Germany when he as in the training course. The software used by connected to the Debug terminal with a Dongle protected plug to the com 1 port of the computer. The software work great and save lot of time in alignment . Unfortunately the software not available to the regular service guys , just like you and me. Actually, the used of this software is not that often, only when you have a major problem, such as flight tube change,HP & LP phase shifter alignment and slit signal Vs dose rate. But it is nice to have the software around when you want it. Our machine was working so well that I haven't use the x-y recorder for all most three years. You may contact Linac house, Crawley training Dept. to see what kind of development of this software and availability to regular Elekta customers. Regards, Patrick Wong Radiotherapy service Technologist Dept of Clinical Physics Fraser Valley Cancer Centre Surrey, British Columbia Canada. E-mail: pwong@bccancer.bc.ca -----Original Message----- From: Fred Fanselow [mailto:f.fanselow@rtil.nl] Sent: Wednesday, September 15, 1999 2:59 AM To: 'linac-eng@plato1.aristotle.net' Subject: Plotting of SL linac signals Hello SL Elekta users, When setting up an energy on a Elekta SL linac, you'll need a XY recorder to make plots of, for example slit signals, HP phaseshifter signals and so on. The use of a XY recorder takes up a lot of time because of offset and gain settings on the recorder and on the linac analog signals. Now I heard that there is software used by some linac engineers to make these plots via the debug I/O port on a pc. Does anyone of you have any information on the availability of this software? Thanks, Fred Fanselow Linac Engineer Institute for radiotherapy Limburg R.T.I.L. Heerlen The Netherlands ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Plotting of SL linac signals Message-ID: <4510ED9293BFD1119D280008C7280D620283BBB7@ex1.gstt.sthames.nhs.uk> From: Stuart.Vessey@gstt.sthames.nhs.uk To: f.fanselow@rtil.nl, linac-eng@plato1.aristotle.net Subject: RE: Plotting of SL linac signals Date: Fri, 17 Sep 1999 01:30:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" There are, I believe, two versions of plotting software about for the SL series. One was developed by a hospital engineer/physicist which uses A/D convertors attached to the output of the Linac (where you would normally attach the X-Y plotter). The second version was developed for the Systems test guys at Elekta. This works by reading the part 4 of the machine item from the debug output of the linac. As I remember, the software was written such that it was dongle protected. It was suggested at the time that it may be an idea for this software tool to be made available for purchase by customers, but I don't know if this was eventually done. I suggest that you talk to either the service department or the training department (unless you have a good contact in the factory) at Elekta. Regards Stuart E Vessey Medical Technical Officer Guys' and St Thomas' NHS Trust ___________________________________________________ Any views stated in this email are my own, and are not to be interpreted as being those of the Trust unless specifically stated otherwise. ___________________________________________________ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mevatron - creeping gantry Message-ID: <9909170229.AA18831@yoyo.rah.sa.gov.au> From: David Horsman To: linac-eng@plato1.aristotle.net Subject: Mevatron - creeping gantry Date: Thu, 16 Sep 1999 16:33:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, I have a KD2 Mevatron with a gantry that creeps slowly whenever the deadman switches are depressed. I have not investigated this in depth due to lack of access to the linac, but I have noticed that the gantry motor lines and tachometer signals float at 110 VAC. Has anybody else noticed this? Is it normal? If not, are there any suggestions as to how 110 VAC could get onto the motor lines and tacho signals? By the way. The gantry motor is a DC motor controlled by a Polyspede controller. Thanks in advance. David Horsman dhorsman@cancer.rah.sa.gov.au Royal Adelaide Hospital Ph 08 8222 4188 Fx 08 8222 5937 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Plotting of SL linac signals Message-ID: <000601bf006f$53b7fd80$e3798cd4@default> From: "S." Reply-To: "S." To: Fred Fanselow Cc: linac digest Subject: Re: Plotting of SL linac signals Date: Thu, 16 Sep 1999 09:26:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Fred, I have seen the software that you are refering to. Our service reps now come equiped with some decent laptops that run the debug software, storage scope waveforms from Fluke meters, x-y plotter etc. It is very impressive and a lot better/easier/quicker than the old x-y plotter method. The waveforms can also be stored on the laptop for further reference. The only problem with this is I believe it is only offered to the official service guys so for the likes of you and me it is either the old x-y plotter method or call the service guy in! By the way, there are a couple of 'interface' boxes that the reps use between the laptop and the SL but I believe that these are only A-D converters and nothing 'top secret'. If I am wrong, and someone knows otherwise, where from and how much is this software? regards Sean Murphy Senior MTO RSH Hospital UK scm1@surfree.co.uk seanmurphy@e36m3evo.freeserve.co.uk ----- Original Message ----- From: Fred Fanselow To: Sent: Wednesday, September 15, 1999 10:58 AM Subject: Plotting of SL linac signals > Hello SL Elekta users, > When setting up an energy on a Elekta SL linac, you'll need a XY > recorder to make plots of, for example slit signals, HP phaseshifter > signals and so on. The use of a XY recorder takes up a lot of time > because of offset and gain settings on the recorder and on the linac > analog signals. Now I heard that there is software used by some linac > engineers to make these plots via the debug I/O port on a pc. Does > anyone of you have any information on the availability of this software? > > Thanks, > Fred Fanselow > Linac Engineer > Institute for radiotherapy Limburg > R.T.I.L. > Heerlen > The Netherlands > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Job opening in Stockholm, Sweden Message-ID: <01BEFF91.AC0C9880.malinl@asf.ks.se> From: Malin Larsson Reply-To: malinl@asf.ks.se To: 'linac-eng' Cc: 'Walter Wyrsch' , "'hmi@rah.ks.se'" , "'janl@asf.ks.se'" Subject: Job opening in Stockholm, Sweden Date: Wed, 15 Sep 1999 05:47:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" A position as linear accelerator engineer is available at Karolinska Sjukhuset, department of hospitalphysics in Stockholm, Sweden. The department has eight accelerators and two simulators, consisting of a Varian 2100 (MLC), two Varian 600 C(MLC's), one Siemens PRIMUS(MLC + beamview), one Elekta SL75/4, two BBC (LA20 and LA6), one Scanditronix MM50 racetrack microtron(MLC) and two Varian Ximatron simulators. We use the Helax Visir verification system with all machines. None of the accelerators are under service contract but the PRIMUS is still under warranty. Replacement of 2-3 accelerators is expected within the next few years. The suitable candidate will be part of a team of totally 3 in-house engineers. We are looking for someone with the following qualifications: * a degree in electronics engineering 2+ years or adequate experience. * at least one year of experience working with radiotherapy equipment, maintenance and repair. * flexibility to work late hours and weekends for emergency repairs. * comfortable using English. * a basic knowledge of computers and computing networks is an advantage. We encourage engineers outside Scandinavia to apply as well. Karolinska Sjukhuset has an extended international exchange within all employee categories. Stockholm is an attractive city of approximately 1,5 million people. Summertime is beautiful and offers a great opportunity to go sailing, play golf i.e. During wintertime, ski resorts are located within 3 hours of transportation and the pulsating night life of Stockholm is good all year. Local transportation is very good and a car is not necessary. The salary will be negotiated later on. Send your application to: Karolinska sjukhuset Division of Oncology- Radiumhemmet Staff secretary Hans Mikaelsson Administrative division S-171 76 Stockholm SWEDEN _____________________ Malin Larsson Service engineer phone: +46 8 51775565 fax: +46 8 7366280 Karolinska Sjukhuset Dept. of hospitalphysics S-171 76 Stockholm SWEDEN ------_=_NextPart_002_01C19966.172FB140 Content-Type: application/msword; name="Jobadvert KS.doc" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="Jobadvert KS.doc" 0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAABAAAALgAAAAAAAAAA EAAAMAAAAAEAAAD+////AAAAAC0AAAD///////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// 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//////////////////////////////////////////////////////////////////////////// /////////wEA/v8DCgAA/////wYJAgAAAAAAwAAAAAAAAEYOAAAAV29yZC1kb2t1bWVudAAKAAAA TVNXb3JkRG9jABAAAABXb3JkLkRvY3VtZW50LjgA9DmycQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAA ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Plotting of SL linac signals Message-ID: <01BEFF71.AFA4C0F0@mail.rtil> From: Fred Fanselow To: "'linac-eng@plato1.aristotle.net'" Subject: Plotting of SL linac signals Date: Wed, 15 Sep 1999 01:58:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello SL Elekta users, When setting up an energy on a Elekta SL linac, you'll need a XY recorder to make plots of, for example slit signals, HP phaseshifter signals and so on. The use of a XY recorder takes up a lot of time because of offset and gain settings on the recorder and on the linac analog signals. Now I heard that there is software used by some linac engineers to make these plots via the debug I/O port on a pc. Does anyone of you have any information on the availability of this software? Thanks, Fred Fanselow Linac Engineer Institute for radiotherapy Limburg R.T.I.L. Heerlen The Netherlands ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Intermittent HWFA on 2100C Message-ID: From: "Williams, Rod" To: "'Virago1100@aol.com'" , linac-eng@plato1.aristotle.net Subject: RE: Intermittent HWFA on 2100C Date: Thu, 9 Sep 1999 02:41:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Virago I is great that you took the time out to give the group this info, this is what this group should about, the time someone can save on a problem like this could be many hours of downtime with much dept inconvenience Thanks for your thoughtfulness. -----Original Message----- From: Virago1100@aol.com [SMTP:Virago1100@aol.com] Sent: Wednesday, September 08, 1999 11:40 AM To: linac-eng@plato1.aristotle.net Subject: Intermittent HWFA on 2100C Gentlemen, Wanted to pass on this info in case anyone else runs into a similar problem, it may save you a headache! Since I am fairly new on this list, I apologize if this is "old" info. Recently had a Clinac 2100C (s/n 705) that started throwing very intermittent HWFA faults, by the time the service guy would get to the site the fault would be cleared and not reproducible. When they first started occurring the customer noticed that the upper jaw readout would be about half of what the jaws were actually at, then after a while it would correct its self. The faults did not appear to be related to gantry angle, collimator angle, or jaw setting and the Upper Jaw2 main readout pot was changed when the log indicated a discrepancy during one of the episodes. The problem then went away for a few days..... but came back as a HWFA that would appear when the machine was first brought up in the morning, after a short while it could be cleared and would not come back until the next morning! This went on for a couple days then disappeared. Two days later the fault came back in the afternoon and could not be cleared. When I arrived at the site the Upper Jaw display was reading slightly less than the actual setting and sometimes would drop momentarily to about half of the actual jaw setting. While checking the + and - supplies on the Upper Jaw 2 posn pot (which were stable) I noticed that the wiper voltage was fluctuating slightly and would intermittently drop down, sometimes to zero volts. Upon removing the wire from the pot wiper connection the wiper voltage returned to normal, a resistance check between the wire and chassis gnd showed a short. Of course I immediately suspected the head cable but was able to rule it out by unplugging the ribbon cable at the Collimator Patch Panel on the gantry, the short went away. To make an already long story short, I eventually traced the short back to the Aux Electronics Backplane and found that by slightly flexing the board I could make the short come and go. As it turns out, the printed circuit run on the Aux Elec Backplane PCB from J34-36 to J32-16 (UJAW 2 POSN) just skirts the bottom edge of the BNC bulkhead connector J24. Since the board is solder masked this would not normally be a problem, but there is a feedthru on the run that the bulkhead connector was ever so slightly touching! Of course the body of the BNC bulkhead connector is grounded and was shorting the UJAW2 POSN voltage when it would contact the small solder hump on the feedthru. Removing the connector (J24), applying fiberglass insulating tape to the bottom, and remounting it to the backplane board cured the problem.....By the way, that sounds a lot easier than it really was!! (why isn't that chassis on slide rails anymore?) In hind sight I can see where heat and/or vibration could very well have made the problem come and go, I just haven't figured out why it never reared its head till now. Hope this saves someone else from banging their head on the wall, Jim McKenzie Acceletronics, MidAtlantic Oh, also.....if you have to do this repair and then end up with an error code of "29" displayed on the Carrousel/Mode PCB, you have knocked the "Personality Module" out of its backplane socket (J44) and will find it between the klystron solenoid and the pulse tank. Experience....the best teacher! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Intermittent HWFA on 2100C Message-ID: <6e6f5630.2507f95f@aol.com> From: Virago1100@aol.com To: linac-eng@plato1.aristotle.net Subject: Intermittent HWFA on 2100C Date: Wed, 8 Sep 1999 09:39:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen, Wanted to pass on this info in case anyone else runs into a similar problem, it may save you a headache! Since I am fairly new on this list, I apologize if this is "old" info. Recently had a Clinac 2100C (s/n 705) that started throwing very intermittent HWFA faults, by the time the service guy would get to the site the fault would be cleared and not reproducible. When they first started occurring the customer noticed that the upper jaw readout would be about half of what the jaws were actually at, then after a while it would correct its self. The faults did not appear to be related to gantry angle, collimator angle, or jaw setting and the Upper Jaw2 main readout pot was changed when the log indicated a discrepancy during one of the episodes. The problem then went away for a few days..... but came back as a HWFA that would appear when the machine was first brought up in the morning, after a short while it could be cleared and would not come back until the next morning! This went on for a couple days then disappeared. Two days later the fault came back in the afternoon and could not be cleared. When I arrived at the site the Upper Jaw display was reading slightly less than the actual setting and sometimes would drop momentarily to about half of the actual jaw setting. While checking the + and - supplies on the Upper Jaw 2 posn pot (which were stable) I noticed that the wiper voltage was fluctuating slightly and would intermittently drop down, sometimes to zero volts. Upon removing the wire from the pot wiper connection the wiper voltage returned to normal, a resistance check between the wire and chassis gnd showed a short. Of course I immediately suspected the head cable but was able to rule it out by unplugging the ribbon cable at the Collimator Patch Panel on the gantry, the short went away. To make an already long story short, I eventually traced the short back to the Aux Electronics Backplane and found that by slightly flexing the board I could make the short come and go. As it turns out, the printed circuit run on the Aux Elec Backplane PCB from J34-36 to J32-16 (UJAW 2 POSN) just skirts the bottom edge of the BNC bulkhead connector J24. Since the board is solder masked this would not normally be a problem, but there is a feedthru on the run that the bulkhead connector was ever so slightly touching! Of course the body of the BNC bulkhead connector is grounded and was shorting the UJAW2 POSN voltage when it would contact the small solder hump on the feedthru. Removing the connector (J24), applying fiberglass insulating tape to the bottom, and remounting it to the backplane board cured the problem.....By the way, that sounds a lot easier than it really was!! (why isn't that chassis on slide rails anymore?) In hind sight I can see where heat and/or vibration could very well have made the problem come and go, I just haven't figured out why it never reared its head till now. Hope this saves someone else from banging their head on the wall, Jim McKenzie Acceletronics, MidAtlantic Oh, also.....if you have to do this repair and then end up with an error code of "29" displayed on the Carrousel/Mode PCB, you have knocked the "Personality Module" out of its backplane socket (J44) and will find it between the klystron solenoid and the pulse tank. Experience....the best teacher! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: AcQSim Problem Message-ID: <37D55D3A.78CC544E@cancerboard.ab.ca> From: Kurt Knibutat To: Oktay Ureten Cc: linac-eng@plato1.aristotle.net Subject: Re: AcQSim Problem Date: Tue, 7 Sep 1999 10:45:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Oktay We just completed the install of two AcQsim/UltraQ systems. They had the same problem. It is due to the newest style monitors which are energy star compliant. Contact your Picker rep as there are patches he can download that will stop both power up and shutdown blanking. -- Kurt Knibutat Tom Baker Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: AcQSim Problem Message-ID: From: Oktay Ureten To: linac-eng@plato1.aristotle.net Subject: AcQSim Problem Date: Mon, 6 Sep 1999 15:27:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi ! We have a Picker AcQSim (V.3.3) virtual simulator (running on a VoxelQ). Today, the system did not come up when I turned the switch on. Actually the hard disk was running but nothing was happening on the screen. (I could only see the Picker logo on a black background). I though the problem was related to monitor or display boards. But, I typed the login and password information without seeing what I was typing on the monitor and then run the application software by typing vx. And the screen came up with the application software. There were nothing wrong!! Same thing happens when I exit the application software. I can not see anything on the monitor when I am in the text screen. Any thoughts about this strange problem? :) Oktay Ureten ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: XimatronC - PRO Message-ID: <000a01bef869$2c70d840$f3c6d6d8@whoknows> From: Richard Kimball To: Linac Engineers Subject: Re: XimatronC - PRO Date: Mon, 6 Sep 1999 05:10:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I can't remember my versions of this machine, but if the serial number range you speak of has the computer at the console instead of inside the stand, this type of problem was easily fixed by reterminating the power leads going to the card racks in the stand. I had this same problem before on early Xim's and was fixed by performing the above. I would suggest monitoring the power supply lines to the PRO pots in any case. Any deviation would be bad. R. Kimball ----- Original Message ----- From: Dave Pinchin To: Sent: Sunday, September 05, 1999 10:10 PM Subject: XimatronC - PRO > G'day all > > I have an interesting PRO problem on our XimatronC #171, Basically the pro system does not seem to have the resolution specified. This can be seen on any movement. > > For example if the gantry is rotated at superslow speed the pro reading goes 159.0, 159.2, 159.4, 159.5, 159.7, 159.9, 160.1, 160.2 etc........ > > 'Ahh!!', you say, 'Noisy pot'. > > Just for the hang of it I put a slow function generator onto the line (and 'scope to check noise) and let it ramp extra-super-slow. Exactly the same results. > > There also seems to be an anomoly at change of diirection. > > The nearest I can suggest is that there is a software hysteresis built in using the logic - > "IF CHANGE IS LESS THAN n (binary) THEN DO NOT UPDATE SCREEN READOUT" > > ??????? Does anybody have similar on their machine ??????? > ????????? Has anybody fixed this before ????????? > > Thanks, > Dave. > > > > > ************************************************************ ********** > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. If you have received this email in error please notify > the system manager. > > This footnote also confirms that this email message has been swept by > MIMEsweeper for the presence of computer viruses. > > www.mimesweeper.com > ************************************************************ ********** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: XimatronC - PRO Message-ID: <199909061126.GAA27177@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: Re: XimatronC - PRO Date: Mon, 6 Sep 1999 04:22:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all Our Ximatron serial number 124 has exactly the same problem and despite many hours trying to resolve this we have had no joy. We even had the our local Ximatron specialist up to take a look and he came up blank also. Now that I see other people have this problem I will persue it again. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: XimatronC - PRO Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: XimatronC - PRO Date: Sun, 5 Sep 1999 19:10:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day all I have an interesting PRO problem on our XimatronC #171, Basically the pro system does not seem to have the resolution specified. This can be seen on any movement. For example if the gantry is rotated at superslow speed the pro reading goes 159.0, 159.2, 159.4, 159.5, 159.7, 159.9, 160.1, 160.2 etc........ 'Ahh!!', you say, 'Noisy pot'. Just for the hang of it I put a slow function generator onto the line (and 'scope to check noise) and let it ramp extra-super-slow. Exactly the same results. There also seems to be an anomoly at change of diirection. The nearest I can suggest is that there is a software hysteresis built in using the logic - "IF CHANGE IS LESS THAN n (binary) THEN DO NOT UPDATE SCREEN READOUT" ??????? Does anybody have similar on their machine ??????? ????????? Has anybody fixed this before ????????? Thanks, Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Triax connetor kit Message-ID: <862567E1.0049CE5E.00@HEIAISAS08.aurora.org> From: Dale Dornacker To: linac-eng@plato1.aristotle.net Subject: Triax connetor kit Date: Fri, 3 Sep 1999 05:28:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter, Do you have the Newark part number or the manufacturers part number for the triax conector kits that you use. I would like to give them a try. Thanks, Dale ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: position available - linac engineer Message-ID: <862567E0.00760A7F.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mdanderson.org To: linac-eng@plato1.aristotle.net Cc: ashiu@mdanderson.org, kabrown@mdanderson.org, dbelivea@mdanderson.org, chusmith@mdanderson.org, twaldron@mdanderson.org, vortiz@mdanderson.org Subject: position available - linac engineer Date: Thu, 2 Sep 1999 13:18:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are looking for a few good linac engineers. The formal posting is included below. Houston offers a pleasant, sub-tropical environment with a burgeoning economy and very low cost of living. There is also currently no state or local income tax here. Accepted candidates would be joining a team of 5 linac engineering personnel in support of patient treatment and research on 12 linear accelerators , 4 Cobalt units, 4 orthovoltage systems, 5 simulators and other RT equipment. If interested, send a resume to the human resources rep. listed below, or feel free to contact me directly via email or phone at (713) 792-3235. THE UNIVERSITY OF TEXAS M. D. ANDERSON CANCER CENTER DEPARTMENT OF RADIATION PHYSICS ACCELERATOR TECHNICIAN III EDUCATION AND EXPERIENCE Approved technical school electronic courses required. Five years experience troubleshooting and repairing electronic equipment including two years in the maintenance of radiation therapy equipment. Preferred experience includes five years experience maintaining radiotherapy equipment such as linear accelerators. College coursework in electronics and computer science plus one year of supervisory experience. WORKING CONDITIONS Some night and weekend work. Radiation environment. High voltage electrical environment. The candidate for this position must be able to perform advanced technical assignments related to the maintenance and operation of accelerators and other complex radiation-producing equipment found in a large radiation therapy facility and will be responsible for repair, maintenance, and operation of equipment relating to radiation therapy activities. EEO/AA. Smoke Free Environment. Interested individuals should send resumes to: Sherri Brownlow, Human Resources 1515 Holcombe Blvd, Box 205 Houston, TX 77030 Fax: (713) 794-5953 Refer to Position Number 1884SXB ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DC Current Probe for the Clinac Guns Message-ID: <0F5B9F57891AD211BF2100805FA7316C01830D37@phsormsg03.phsor.org> From: "Leeder, Mike" To: "Loeks, Michael" , "Wilson, Jim" , "Stober, Gary" Subject: DC Current Probe for the Clinac Guns Date: Wed, 1 Sep 1999 11:31:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" The only way to get a probe with a throat big enough (0.5") is to go to the Tektronix AM503 current probe amplifier (a TM5000 plug in) and its about $3000 just for the amplifier. Accurately measuring the Gun current is what needs to be done to perform a Miram curve. ------_=_NextPart_002_01C19966.172FB140 Content-Type: image/jpeg; name="Notebook.jpg" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="Notebook.jpg" Content-ID: <810422719@01091999-16ca> /9j/4AAQSkZJRgABAgEASABIAAD/7QSyUGhvdG9zaG9wIDMuMAA4QklNA+kAAAAAAHgAAwAAAEgA SAAAAAADBgJS//f/9wMPAlsDRwUoA/wAAgAAAEgASAAAAAAC2AIoAAEAAABkAAAAAQADAwMAAAAB Jw8AAQABAAAAAAAAAAAAAAAAYAgAGQGQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA4 QklNA+0AAAAAABAASAAAAAEAAQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAA4QklNBAoAAAAA AAEAADhCSU0nEAAAAAAACgABAAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEA L2ZmAAEAoZmaAAYAAAAAAAEAMgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklN A/gAAAAAAHAAAP////////////////////////////8D6AAAAAD///////////////////////// ////A+gAAAAA/////////////////////////////wPoAAAAAP////////////////////////// //8D6AAAOEJJTQQAAAAAAAACAAA4QklNBAIAAAAAAAIAADhCSU0ECAAAAAAAEAAAAAEAAAJAAAAC QAAAAAA4QklNBAkAAAAAAqIAAAABAAAAgAAAAAIAAAGAAAADAAAAAoYAGAAB/9j/4AAQSkZJRgAB AgEASABIAAD//gAnRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcKggNC4wAP/uAA5BZG9i ZQBkgAAAAAH/2wCEAAwICAgJCAwJCQwRCwoLERUPDAwPFRgTExUTExgRDAwMDAwMEQwMDAwMDAwM DAwMDAwMDAwMDAwMDAwMDAwMDAwBDQsLDQ4NEA4OEBQODg4UFA4ODg4UEQwMDAwMEREMDAwMDAwR DAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDP/AABEIAAIAgAMBIgACEQEDEQH/3QAEAAj/xAE/ AAABBQEBAQEBAQAAAAAAAAADAAECBAUGBwgJCgsBAAEFAQEBAQEBAAAAAAAAAAEAAgMEBQYHCAkK CxAAAQQBAwIEAgUHBggFAwwzAQACEQMEIRIxBUFRYRMicYEyBhSRobFCIyQVUsFiMzRygtFDByWS U/Dh8WNzNRaisoMmRJNUZEXCo3Q2F9JV4mXys4TD03Xj80YnlKSFtJXE1OT0pbXF1eX1VmZ2hpam tsbW5vY3R1dnd4eXp7fH1+f3EQACAgECBAQDBAUGBwcGBTUBAAIRAyExEgRBUWFxIhMFMoGRFKGx QiPBUtHwMyRi4XKCkkNTFWNzNPElBhaisoMHJjXC0kSTVKMXZEVVNnRl4vKzhMPTdePzRpSkhbSV xNTk9KW1xdXl9VZmdoaWprbG1ub2JzdHV2d3h5ent8f/2gAMAwEAAhEDEQA/APROif0Kv6X81T9L j+ar/m/5K0F8rJJIfqlJfKySKn6pSXyskkp+qUl8rJJKfqlJfKySSn6pSXyskkp+qUl8rJJKfqlJ fKySSn//2ThCSU0EBgAAAAAABwABAAAAAQEA//4AJ0ZpbGUgd3JpdHRlbiBieSBBZG9iZSBQaG90 b3Nob3CoIDQuMAD/7gAOQWRvYmUAZIAAAAAB/9sAhAAMCAgNCQ0VDAwVGhQQFBogGxoaGyAiFxcX FxciEQwMDAwMDBEMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMAQ0NDREOERsRERsUDg4OFBQO Dg4OFBEMDAwMDBERDAwMDAwMEQwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAz/wAARCAAYBaAD ASIAAhEBAxEB/90ABABa/8QBPwAAAQUBAQEBAQEAAAAAAAAAAwABAgQFBgcICQoLAQABBQEBAQEB AQAAAAAAAAABAAIDBAUGBwgJCgsQAAEEAQMCBAIFBwYIBQMMMwEAAhEDBCESMQVBUWETInGBMgYU kaGxQiMkFVLBYjM0coLRQwclklPw4fFjczUWorKDJkSTVGRFwqN0NhfSVeJl8rOEw9N14/NGJ5Sk hbSVxNTk9KW1xdXl9VZmdoaWprbG1ub2N0dXZ3eHl6e3x9fn9xEAAgIBAgQEAwQFBgcHBgU1AQAC EQMhMRIEQVFhcSITBTKBkRShsUIjwVLR8DMkYuFygpJDUxVjczTxJQYWorKDByY1wtJEk1SjF2RF VTZ0ZeLys4TD03Xj80aUpIW0lcTU5PSltcXV5fVWZnaGlqa2xtbm9ic3R1dnd4eXp7fH/9oADAMB AAIRAxEAPwCv0T+n4/8AxrP+qavW15J0U/r+P/xrP+qavWg8eKElsWSHZfXWYe4A+ZUMjIFTJBE/ Fc1kXbg63mJP+amk0uesGqdc19Sup2ZrLmWGQxwLR4B35v8A0V0qKlJJJIqUkkkkpSSSSSlJJJJK UkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSS SSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJ KUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpS SSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJ JKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkp SSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJJJKUkkkkpSSSSSlJJ JJKUkkkkpSSSSSn/0J9G6oKn04zKKXOdYA6x7d1kOP8Ag/3Hs/MXY/sOl/0hYfCT/wCQavnZJArQ /S1HTXVN21+weYa7/vqzcroeQ+Q3XcYOn/mbF89pIaJfpboXRK+k1uDQPUsILyONPotZ/JatRfKq SSX6qSXyqkip+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJ KfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp +qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6 qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqp JfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl 8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXy qkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKq SSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJ KfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp +qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn6 qSXyqkkp+qkl8qpJKfqpJfKqSSn6qSXyqkkp+qkl8qpJKfqpJfKqSSn/2Q== ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian 2300 Gun? Message-ID: From: Accelinear@aol.com To: "Stober, Gary" , linac-eng@plato1.aristotle.net Subject: Re: Varian 2300 Gun? Date: Tue, 31 Aug 1999 18:28:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The gun needs to be fully activated. This is a standard requirement of all guns now. You will need a variable transformer (external) so that you can bring it up to about 8.2-8.4 volts. As you purchased the gun from Varian they should provide you with a suitable procedure. You will need to follow it so as not to violate your warranty. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian 2300 Gun? Message-ID: From: Accelinear@aol.com To: "Stober, Gary" , linac-eng@plato1.aristotle.net Subject: Re: Varian 2300 Gun? Date: Tue, 31 Aug 1999 18:28:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The gun needs to be fully activated. This is a standard requirement of all guns now. You will need a variable transformer (external) so that you can bring it up to about 8.2-8.4 volts. As you purchased the gun from Varian they should provide you with a suitable procedure. You will need to follow it so as not to violate your warranty. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian 2300 Gun? Message-ID: From: Accelinear@aol.com To: "Stober, Gary" , linac-eng@plato1.aristotle.net Subject: Re: Varian 2300 Gun? Date: Tue, 31 Aug 1999 18:28:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The gun needs to be fully activated. This is a standard requirement of all guns now. You will need a variable transformer (external) so that you can bring it up to about 8.2-8.4 volts. As you purchased the gun from Varian they should provide you with a suitable procedure. You will need to follow it so as not to violate your warranty. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian 2300 Gun? Message-ID: From: Accelinear@aol.com To: "Stober, Gary" , linac-eng@plato1.aristotle.net Subject: Re: Varian 2300 Gun? Date: Tue, 31 Aug 1999 18:28:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The gun needs to be fully activated. This is a standard requirement of all guns now. You will need a variable transformer (external) so that you can bring it up to about 8.2-8.4 volts. As you purchased the gun from Varian they should provide you with a suitable procedure. You will need to follow it so as not to violate your warranty. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 2300 Gun? Message-ID: <0F5B9F57891AD211BF2100805FA7316C4E5449@phsormsg03.phsor.org> From: "Stober, Gary" To: 'Linac' Subject: Varian 2300 Gun? Date: Tue, 31 Aug 1999 13:57:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen, We recently replaced the electron gun (after replacing the target for a water leak). The new gun seemed to be defective after processing was complete. After pulsing the gun for 5 hours, the gun current was falling fast. The Varian rep asked about grid processing which isn't mentioned in our books so ,of course, we didn't do it. He also says that grid processing now wouldn't help since we've already had the gun pulsing. He's was able to "bring the gun back" by running the filiment at 7 volts for a few hours. Have any of you had experience with bad on arrival guns from Varian? Also, what about grid processing? Did we shoot ourselves in the foot by missing something? What could happen to the system without processing the grid? Even though we're already spending big bucks with Varian, any info on grid processing would be greatly appreciated. Gary Stober Biomedical Technician Providence St Vincent Medical Center Portland, OR USA (503) 216-2988 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 2300 Gun? Message-ID: <0F5B9F57891AD211BF2100805FA7316C4E5449@phsormsg03.phsor.org> From: "Stober, Gary" To: 'Linac' Subject: Varian 2300 Gun? Date: Tue, 31 Aug 1999 13:57:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen, We recently replaced the electron gun (after replacing the target for a water leak). The new gun seemed to be defective after processing was complete. After pulsing the gun for 5 hours, the gun current was falling fast. The Varian rep asked about grid processing which isn't mentioned in our books so ,of course, we didn't do it. He also says that grid processing now wouldn't help since we've already had the gun pulsing. He's was able to "bring the gun back" by running the filiment at 7 volts for a few hours. Have any of you had experience with bad on arrival guns from Varian? Also, what about grid processing? Did we shoot ourselves in the foot by missing something? What could happen to the system without processing the grid? Even though we're already spending big bucks with Varian, any info on grid processing would be greatly appreciated. Gary Stober Biomedical Technician Providence St Vincent Medical Center Portland, OR USA (503) 216-2988 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 2300 Gun? Message-ID: <0F5B9F57891AD211BF2100805FA7316C4E5449@phsormsg03.phsor.org> From: "Stober, Gary" To: 'Linac' Subject: Varian 2300 Gun? Date: Tue, 31 Aug 1999 13:57:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen, We recently replaced the electron gun (after replacing the target for a water leak). The new gun seemed to be defective after processing was complete. After pulsing the gun for 5 hours, the gun current was falling fast. The Varian rep asked about grid processing which isn't mentioned in our books so ,of course, we didn't do it. He also says that grid processing now wouldn't help since we've already had the gun pulsing. He's was able to "bring the gun back" by running the filiment at 7 volts for a few hours. Have any of you had experience with bad on arrival guns from Varian? Also, what about grid processing? Did we shoot ourselves in the foot by missing something? What could happen to the system without processing the grid? Even though we're already spending big bucks with Varian, any info on grid processing would be greatly appreciated. Gary Stober Biomedical Technician Providence St Vincent Medical Center Portland, OR USA (503) 216-2988 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 2300 Gun? Message-ID: <0F5B9F57891AD211BF2100805FA7316C4E5449@phsormsg03.phsor.org> From: "Stober, Gary" To: 'Linac' Subject: Varian 2300 Gun? Date: Tue, 31 Aug 1999 13:57:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen, We recently replaced the electron gun (after replacing the target for a water leak). The new gun seemed to be defective after processing was complete. After pulsing the gun for 5 hours, the gun current was falling fast. The Varian rep asked about grid processing which isn't mentioned in our books so ,of course, we didn't do it. He also says that grid processing now wouldn't help since we've already had the gun pulsing. He's was able to "bring the gun back" by running the filiment at 7 volts for a few hours. Have any of you had experience with bad on arrival guns from Varian? Also, what about grid processing? Did we shoot ourselves in the foot by missing something? What could happen to the system without processing the grid? Even though we're already spending big bucks with Varian, any info on grid processing would be greatly appreciated. Gary Stober Biomedical Technician Providence St Vincent Medical Center Portland, OR USA (503) 216-2988 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Verification systems and net traffic. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Verification systems and net traffic. Date: Tue, 31 Aug 1999 13:59:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear all, Reading the current talk on verification systems and net traffic, I'd like to add ....... Use a switch instead of a hub. A hub sends every packet it receives to every node, and leaves each node to decide whether the packet is meant for it or not. This adds a lot of work to the node PC and takes a lot of bandwidth on the cables. Using an inteligent switch can enhance the verification system performance by SEVERAL orders of magnitude by only allowing the packets destined for a node to get to that node. You should also be able to limit the level of broadcasts that can be passed by the switch. This will give the effect that your verification system (whatever breed) will be on it's own network segment and still allow connectivity to other systems. There is a price hit but it's worth every bit of it. We installed a Cisco 2916 on our VARiS and it performs superbly (as far as network comms is concerned). Dave. ************************************************** There's only one sure thing in life, that's doubt.......I think. form - Good bye Pork Pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Verification systems and net traffic. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Verification systems and net traffic. Date: Tue, 31 Aug 1999 13:59:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear all, Reading the current talk on verification systems and net traffic, I'd like to add ....... Use a switch instead of a hub. A hub sends every packet it receives to every node, and leaves each node to decide whether the packet is meant for it or not. This adds a lot of work to the node PC and takes a lot of bandwidth on the cables. Using an inteligent switch can enhance the verification system performance by SEVERAL orders of magnitude by only allowing the packets destined for a node to get to that node. You should also be able to limit the level of broadcasts that can be passed by the switch. This will give the effect that your verification system (whatever breed) will be on it's own network segment and still allow connectivity to other systems. There is a price hit but it's worth every bit of it. We installed a Cisco 2916 on our VARiS and it performs superbly (as far as network comms is concerned). Dave. ************************************************** There's only one sure thing in life, that's doubt.......I think. form - Good bye Pork Pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Verification systems and net traffic. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Verification systems and net traffic. Date: Tue, 31 Aug 1999 13:59:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear all, Reading the current talk on verification systems and net traffic, I'd like to add ....... Use a switch instead of a hub. A hub sends every packet it receives to every node, and leaves each node to decide whether the packet is meant for it or not. This adds a lot of work to the node PC and takes a lot of bandwidth on the cables. Using an inteligent switch can enhance the verification system performance by SEVERAL orders of magnitude by only allowing the packets destined for a node to get to that node. You should also be able to limit the level of broadcasts that can be passed by the switch. This will give the effect that your verification system (whatever breed) will be on it's own network segment and still allow connectivity to other systems. There is a price hit but it's worth every bit of it. We installed a Cisco 2916 on our VARiS and it performs superbly (as far as network comms is concerned). Dave. ************************************************** There's only one sure thing in life, that's doubt.......I think. form - Good bye Pork Pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Verification systems and net traffic. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Verification systems and net traffic. Date: Tue, 31 Aug 1999 13:59:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear all, Reading the current talk on verification systems and net traffic, I'd like to add ....... Use a switch instead of a hub. A hub sends every packet it receives to every node, and leaves each node to decide whether the packet is meant for it or not. This adds a lot of work to the node PC and takes a lot of bandwidth on the cables. Using an inteligent switch can enhance the verification system performance by SEVERAL orders of magnitude by only allowing the packets destined for a node to get to that node. You should also be able to limit the level of broadcasts that can be passed by the switch. This will give the effect that your verification system (whatever breed) will be on it's own network segment and still allow connectivity to other systems. There is a price hit but it's worth every bit of it. We installed a Cisco 2916 on our VARiS and it performs superbly (as far as network comms is concerned). Dave. ************************************************** There's only one sure thing in life, that's doubt.......I think. form - Good bye Pork Pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Ross enteral pumps Message-ID: <0F5B9F57891AD211BF2100805FA7316C01830D30@phsormsg03.phsor.org> From: "Leeder, Mike" To: "Gordon, Michael" , "McIlroy, Donald" , "Wilson, Jim" Subject: FW: Ross enteral pumps Date: Tue, 31 Aug 1999 13:26:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > -----Original Message----- > From: Vachal, Sharon > Sent: Monday, August 30, 1999 7:55 AM > To: Menken, Dean; Leeder, Mike > Subject: Ross enteral pumps > > Dean, The 21 pumps for PPMC will be arriving Sept. 7, is it possible to > get on your schedule to have them checked out that week? > > Mike, 30 pumps for PSTV should follow within a week, I should know a > definite date in a day or two and will let you know. > > thanks, > Sharon Vachal > Regional Materials Management, POP > 215-4466 > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RMS 2000 SIF Message-ID: <199908311955.OAA21035@plato1.aristotle.net> From: JIM WALLACE Reply-To: JIM@gloria.force9.co.uk To: linac-eng@plato1.aristotle.net Subject: RMS 2000 SIF Date: Tue, 31 Aug 1999 11:37:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks, Have a problem with our RMS 2000 coupled to our 1800. Happened after a power failure. Trouble is when staff bring up the treatment field we are getting asterisks for all position readouts in the ACTUAL columns. Energy, time etc ok. The asterisks change to a readout every few seconds but wrong ones. For example when gantry at 0 (iec scale) readout is observed to be 288. If gantry physically moved 20 degs readout also changes by 20 ie 308. The same happens to coll. Jaw size has to be physically less than 12cms to get a reading , this is 38.8. Couch parameters always stay as asterisks. Sounds like stobe timing or voltage wrong. We have very little information or spares for this SIF. The 1800 itself works OK all readouts in spec. Incidentally our 600c which is networked with 1800 works OK using RMS. Any thoughts guys. Jim Wallace The Princess Royal Hospital Hull England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RMS 2000 SIF Message-ID: <199908311955.OAA21035@plato1.aristotle.net> From: JIM WALLACE Reply-To: JIM@gloria.force9.co.uk To: linac-eng@plato1.aristotle.net Subject: RMS 2000 SIF Date: Tue, 31 Aug 1999 11:37:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks, Have a problem with our RMS 2000 coupled to our 1800. Happened after a power failure. Trouble is when staff bring up the treatment field we are getting asterisks for all position readouts in the ACTUAL columns. Energy, time etc ok. The asterisks change to a readout every few seconds but wrong ones. For example when gantry at 0 (iec scale) readout is observed to be 288. If gantry physically moved 20 degs readout also changes by 20 ie 308. The same happens to coll. Jaw size has to be physically less than 12cms to get a reading , this is 38.8. Couch parameters always stay as asterisks. Sounds like stobe timing or voltage wrong. We have very little information or spares for this SIF. The 1800 itself works OK all readouts in spec. Incidentally our 600c which is networked with 1800 works OK using RMS. Any thoughts guys. Jim Wallace The Princess Royal Hospital Hull England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RMS 2000 SIF Message-ID: <199908311955.OAA21035@plato1.aristotle.net> From: JIM WALLACE Reply-To: JIM@gloria.force9.co.uk To: linac-eng@plato1.aristotle.net Subject: RMS 2000 SIF Date: Tue, 31 Aug 1999 11:37:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks, Have a problem with our RMS 2000 coupled to our 1800. Happened after a power failure. Trouble is when staff bring up the treatment field we are getting asterisks for all position readouts in the ACTUAL columns. Energy, time etc ok. The asterisks change to a readout every few seconds but wrong ones. For example when gantry at 0 (iec scale) readout is observed to be 288. If gantry physically moved 20 degs readout also changes by 20 ie 308. The same happens to coll. Jaw size has to be physically less than 12cms to get a reading , this is 38.8. Couch parameters always stay as asterisks. Sounds like stobe timing or voltage wrong. We have very little information or spares for this SIF. The 1800 itself works OK all readouts in spec. Incidentally our 600c which is networked with 1800 works OK using RMS. Any thoughts guys. Jim Wallace The Princess Royal Hospital Hull England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RMS 2000 SIF Message-ID: <199908311955.OAA21035@plato1.aristotle.net> From: JIM WALLACE Reply-To: JIM@gloria.force9.co.uk To: linac-eng@plato1.aristotle.net Subject: RMS 2000 SIF Date: Tue, 31 Aug 1999 11:37:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks, Have a problem with our RMS 2000 coupled to our 1800. Happened after a power failure. Trouble is when staff bring up the treatment field we are getting asterisks for all position readouts in the ACTUAL columns. Energy, time etc ok. The asterisks change to a readout every few seconds but wrong ones. For example when gantry at 0 (iec scale) readout is observed to be 288. If gantry physically moved 20 degs readout also changes by 20 ie 308. The same happens to coll. Jaw size has to be physically less than 12cms to get a reading , this is 38.8. Couch parameters always stay as asterisks. Sounds like stobe timing or voltage wrong. We have very little information or spares for this SIF. The 1800 itself works OK all readouts in spec. Incidentally our 600c which is networked with 1800 works OK using RMS. Any thoughts guys. Jim Wallace The Princess Royal Hospital Hull England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Yield faults on 600C/D Message-ID: From: "Nelson, Steve" To: 'Linac Engineers' Subject: Yield faults on 600C/D Date: Tue, 31 Aug 1999 05:40:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello group, Thanks for all the replies. Here is the end result of what we found. There were two distinct problems with the modulator. We did not change out the maggie as I stated we would, because it became apparent that the problem was not associated with it. We noticed that in order to make the fault happen, the modulator needed to heat up and then cool down for about 5 min. Even then the problem would not always show up. BTW "the problem" was PFN voltages varying (Varian) from pulse to pulse at high rep rates - hence the maggie current changing at the worst 15 A between pulses. This was generating the yield faults. After a lot of measurements were made, the HVPS was eliminated because all of the voltages were normal with and without "the problem". After engaging and disengaging the crowbar many times to make these measurements, all of a sudden there was no beam and no PFN discharges. Low and behold the main thyratron had popped out of the socket and was just sitting above it with no filament lit. Turns out that they took the rubber shock absorbers off of the crowbar and mounted it directly to the main thyratron chassis for some reason. Well..... when you cycle the crowbar enough times, you can see the tube rising out of the socket until it looses the keep-alive voltage . We ran a lot of beam with the keep-alive voltage off and the machine would sometimes run well and sometimes run with" the problem". Almost certain that the source of "the problem" had been discovered, we placed a hose clamp around the base to secure it in place. We ran a lot of beam without seeing "the problem". All covers were replaced and a final check was made. "The problem" was there. This time however the PFN fluctuation was small and the maggie deviation was almost indiscernible. The Product specialist worked on into Friday night. He was able to show me later that when he connected the coil that is in series with the Main thyratron anode, he could generate "the problem". When he disconnected (or shorted around) this coil, the PFN waveform looked a little noisier, but stable. He was able to show this three successive times and we deemed "the problem(s)" solved. Look for the STB's coming soon to you local facility. regards, Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 843-792-3271 nelson@radonc.musc.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varis and EXT I/L Message-ID: <35126cad.24fcb368@aol.com> From: SMcna39074@aol.com To: CCCHM@qe2-hsc.ns.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Varis and EXT I/L Date: Mon, 30 Aug 1999 20:26:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" If Varis is running on a network LAN with other traffic, it is very possible that the system is too busy at times; which is when the EXT I/L happens--thats what happens with IMPAC on our system until we upgraded to 100baseT. Of course the EXT clears intermittantly with an overloaded network, may not happen with Varis, depends on timing. Stan McNally, Cancer Foundation of Santa Barbara, Ca 93105 805-682-7300 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varis and EXT I/L Message-ID: <49a41e39.24fbe7dd@aol.com> From: Accelinear@aol.com To: CCCHM@qe2-hsc.ns.ca, linac-eng@plato1.aristotle.net Subject: Re: Varis and EXT I/L Date: Mon, 30 Aug 1999 05:57:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sounds like your serial communications line is only "just" working and that at times you need to reinitialize it. You only see it after Cal/check because you need to be programmed up to see the EXT interlock. I would suggest changing the serial cable between the Varis and the 2100. If the problem still continues try changing the serial cards on each end. These are standard hardware items that your local computer shop should have on the shelf for about $25 each. Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varis and EXT I/L Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Varis and EXT I/L Date: Mon, 30 Aug 1999 03:51:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Clinac 2100C SN 708 with MLC running in conjunction with Varis 1.4b. Occasionally get EXT interlocks (and alway have since the machine has been installed). The techs clear it by going in to Physics mode and under Configuration, set up the RV interface and save it. Sometimes it happens 5 or 6 times a day. Some weeks it does not happen at all. It usually happens just after Cal Check. Trying to find some info on it with the material we have here. No luck so far. Anyone else have a similar problem? Any help would be appreciated. Thanks! Carl Murphy Electronics Engineering Technologist Nova Scotia Cancer Centre QEII Health Sciences Centre Halifax, Nova Scotia, Canada Phone: 902.473.6152 Fax: 902.473.6120 Email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: No Beam Message-ID: <000BF5DA.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net, Carl Murphy Subject: Re: No Beam Date: Fri, 27 Aug 1999 09:05:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" key switch contacts. ______________________________ Reply Separator _________________________________ Subject: No Beam Author: Carl Murphy at PO_EXTERNET Date: 8/27/99 8:22 AM Got a 600C SN 311. No beam on. Whenever I beam on, I get a HWFA. K1 is not coming on. Replaced the Timer I/F PCB. Any suggestions. Stumped. Carl Murphy Electronics Engineering Technologist Nova Scotia Cancer Centre QEII Health Sciences Centre Halifax, Nova Scotia, Canada Phone: 902.473.6152 Fax: 902.473.6120 Email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: No Beam Message-ID: <000BF5DA.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net, Carl Murphy Subject: Re: No Beam Date: Fri, 27 Aug 1999 09:05:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" key switch contacts. ______________________________ Reply Separator _________________________________ Subject: No Beam Author: Carl Murphy at PO_EXTERNET Date: 8/27/99 8:22 AM Got a 600C SN 311. No beam on. Whenever I beam on, I get a HWFA. K1 is not coming on. Replaced the Timer I/F PCB. Any suggestions. Stumped. Carl Murphy Electronics Engineering Technologist Nova Scotia Cancer Centre QEII Health Sciences Centre Halifax, Nova Scotia, Canada Phone: 902.473.6152 Fax: 902.473.6120 Email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: No Beam Message-ID: <000BF5D9.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: linac-eng@plato1.aristotle.net, Carl Murphy Subject: Re: No Beam Date: Fri, 27 Aug 1999 09:04:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" 120 vac door contact. ______________________________ Reply Separator _________________________________ Subject: No Beam Author: Carl Murphy at PO_EXTERNET Date: 8/27/99 8:22 AM Got a 600C SN 311. No beam on. Whenever I beam on, I get a HWFA. K1 is not coming on. Replaced the Timer I/F PCB. Any suggestions. Stumped. Carl Murphy Electronics Engineering Technologist Nova Scotia Cancer Centre QEII Health Sciences Centre Halifax, Nova Scotia, Canada Phone: 902.473.6152 Fax: 902.473.6120 Email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD mod Message-ID: <199908271337.IAA06198@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: 600CD mod Date: Fri, 27 Aug 1999 06:34:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all. In response to Chris Forrest's request here's how our machine was mod'd. I don't feel that this info is secret as the mod is not in a sealed black box. 1. The 2 resistors in the de-spiking network were removed and replaced by 4 others. 2. Another capacitor was added in the de-spiking network. 3. A trim inductor / coil was inserted between the PFN and the main Thyratron. Then just simply check your yield servo settings and if neccassary adjust Frequency and recalibrate PV. So far today not one single erroneous interlock or line on images. We plan to swap out the magnetron and ship it to EEV in order that they can assess it and if required process it for us. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: No Beam Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: No Beam Date: Fri, 27 Aug 1999 05:22:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Got a 600C SN 311. No beam on. Whenever I beam on, I get a HWFA. K1 is not coming on. Replaced the Timer I/F PCB. Any suggestions. Stumped. Carl Murphy Electronics Engineering Technologist Nova Scotia Cancer Centre QEII Health Sciences Centre Halifax, Nova Scotia, Canada Phone: 902.473.6152 Fax: 902.473.6120 Email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 600CD Mod Message-ID: From: "Nelson, Steve" To: 'Chris FORREST' Cc: 'Linac Engineers' Subject: RE: 600CD Mod Date: Fri, 27 Aug 1999 04:38:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, Well, .........we thought that it was fixed. We have another product specialist on site at the moment. Three days after the first group pronounced that the problem was fixed , we started getting yield faults again. The specialist from the factory is quite impressive in his understanding of the machine and his methods. I'll let you and the list know the end result. So far we have been through the HVPS and modulator with a fine toothed comb and have come up empty. The symptom is that occassionally the maggie pulse will show 105 A on one or more pulses and 90 A on one or more pulses. The problem comes and goes and is hard to induce. Today we will replace the (new) maggie. regards to all, Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 843-792-3271 nelson@radonc.musc.edu > -----Original Message----- > From: Chris FORREST [SMTP:chrisf@ulth.northy.nhs.uk] > Sent: Friday, August 27, 1999 6:58 AM > To: linac-eng@plato1.aristotle.net > Subject: 600CD Mod > > Nice to hear your 600CD has been fixed. What has been done to fix it??? > > > Chris Forrest > Cookridge Hospital > Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD Mod Message-ID: <99Aug27.120339bst.11650@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: 600CD Mod Date: Fri, 27 Aug 1999 02:57:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Nice to hear your 600CD has been fixed. What has been done to fix it??? Chris Forrest Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD MAG I spike Message-ID: <199908270935.EAA01680@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: 600CD MAG I spike Date: Fri, 27 Aug 1999 02:32:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello again to all list users. Has anybody seen our MAG I spike - It seems to be missing, presumed dead!!! A Varian engineer attended site on thursday 26th and installed a modification onto our 600CD. This did indeed remove the large spike on the leading egde of the MAG I pulse and that can't be bad. Time will tell if it "eliminates arcing and moding of the magnetron which causes artifacts on PV images and erroneous noise induced interlocks" The PV was re-calibrated and the horizontal lines seem to have disappeared. We also recieved a new magnetron from Varian to replace the one that died early and for that we are very grateful. Thankyou all for your comments and ideas and input. One final thought though:- How does a linac user know what mod's or upgrades are available from the linac supplier? do the suppliers issue lists somewhere? I know that the suppliers will say that it is proprietry but that does not help the users that have a problem and have no idea that there may be a mod' in the system to deal with it. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <000951210631D311B91A00A0C9DED0B867AC2E@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato.aristotle.net'" Subject: Date: Thu, 26 Aug 1999 19:48:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To : Robert Wood Subject : Linac Water Issues. From : Peter Caunt Robert, Ah, the problem of reticulated cooling water. Wish I had a dollar for every problem in this area. O.K. grab yourself a copy of Varian's Water System Mechanical Schematic D 876072 and note the previously given "city water" specs. Next, use "black box" analogy and consider the whole linac to be a black box which requires the given city water specs to operate correctly i.e. Flow rate 8GPM Minimum pressure drop through the "black box" is 22PSI Maximum allowable pressure in pipes, 100PSI Temperature minimum is 50 degrees F (N.B.) Temperature maximum is 86 degrees F Nice and easy so far, but here is where we get a little more difficult. As was discussed previously (in the old days) many Varian linacs were built (our good old 6/100 and more recent 2300CD for instance) in a way which presented a normal flow or no flow load condition to the cooling system. This is fine when the linac is fed from "city water" i.e. to cool -> tap goes on otherwise tap goes off - minimises wastage of water. But reticulated cooling water systems prefers a more consistent loading, so Varian replumbed machines to either divert cooling water through the heat exchanger or around it as determined by the Barber Coleman operation i.e. the tap is always on. So, now we have a dynamic but constant load "black box" system. You can fudge the specs a bit to get operational but for reliability measure the pressures, draw up want you want and consult someone experienced with hydraulics. Your particular solution may be a simple as increased feed pipe diameter or an additional circulating pump to increase differential pressure. Anyway, good luck and hope that this helps. Normal disclaimer about my employer's responsibilities in this matter. Peter Caunt Department of Radiation Oncology The Canberra Hospital Canberra, ACT, Australia. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Water Preasure Message-ID: <47e147c8.24f754b1@aol.com> From: Accelinear@aol.com To: woodr@slrmc.org, mdenning@emh.org Cc: linac-eng@plato1.aristotle.net Subject: Re: Water Preasure Date: Thu, 26 Aug 1999 18:40:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Robert, The spec Mike sent you should help you identify your problem. If the pressure drop across the heat exchanger is 25 psi (input psi - output psi) and the input temp is 86 degrees F or less then the problem isn't your cooling system but rather maybe you have a plugged up heat exchanger. On many occasions I have seen the heat exchangers get totally filled with muck. They can often be cleaned with a garden hose but what a mess! Look at the positive side, if you can make it through a few more weeks the temps will be cooling down so you may be off the hook until next summer. Good luck, Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Water Preasure Message-ID: <1EB2C38D998ED211B83400805F853AFE081F14@europa.emh.org> From: "Denning, Mike" To: 'Robert Wood' Cc: "Linac-eng (E-mail)" Subject: RE: Water Preasure Date: Thu, 26 Aug 1999 11:07:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm going to respond with the data book requirements and also note that we use a closed loop chiller for our 3 linacs. City water 8 gpm 22psi drop min 100psig max 86 deg F max 50 deg F min Mike Denning Eastern Maine Medical Center > -----Original Message----- > From: Robert Wood [SMTP:woodr@slrmc.org] > Sent: Thursday, August 26, 1999 12:47 PM > To: rwick@bccancer.bc.ca; linac-eng@plato1.aristotle.net > Subject: Water Preasure > > What are you folks running on the city water coming into the heat > exchanger on your Varian 2100's. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Water Preasure Message-ID: From: Robert Wood To: rwick@bccancer.bc.ca, linac-eng@plato1.aristotle.net Subject: Water Preasure Date: Thu, 26 Aug 1999 08:46:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" What are you folks running on the city water coming into the heat exchanger on your Varian 2100's. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Practical Test Message-ID: <0F5B9F57891AD211BF2100805FA7316C0196CA9A@PHSORMSG03> From: "Gilbert, Patricia" To: "Wilson, Jim" Cc: "Coleman, Paul" , "Leeder, Mike" Subject: Practical Test Date: Thu, 26 Aug 1999 09:38:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, we have an applicant, Amy Baker, who passed the written electronic exam soooo now she need to try out the practical exam. She's available on Fridays. Since she's from out of town Paul would like to take advantage of the time she's here to interview her....that's if she passes the practical. Can I get some dates/times from ya. Donkashane Patricia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Nucletron Motor Drive Message-ID: <9908252353.AA00226@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Subject: RE: Nucletron Motor Drive Date: Wed, 25 Aug 1999 15:36:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello again. Information for everybody who does not want to buy those things from Nucletron. First of all there are 7 drives in Simulix: 3 smaller and 4 larger ones. We had a problem with a smaller one called Mini Maestro 60x7/14. I have not got an opportunity to check if the bigger one is made by the same company although I hope so. The company is Control Techniques . Here are some contact numbers. Canada Toronto Drive Centre 1 905 475 4699 U.K. Birmingham Drive Centre (two more one the list) 44 121 544 5595 USA San Francisco Drive Centre (seven more on the list) 1 510 264 4940 Contact me for other locations around the world (more than 70 locations listed in the manual). The drive comes from the factory with a manual that contains a block diagram and explains all controls and adjustment (we did not have any sensible information on those drives in Nucletron manual). Do not forget to install resistor assembly on the new drive from the old one when replace it. Regards, Andrew Frolov Manager, Radiation Engineering Medical Physics Royal Adelaide Hospital Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: RF driver Message-ID: From: Craig Pearce To: 'Andrew Frolov' Cc: 'linac eng' Subject: RE: RF driver Date: Tue, 24 Aug 1999 17:20:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Varian at one stage used this manufacture I understand. We had one fitted to our new 2100 but for some reason it was replaced with the new style SPC RF driver. The following link will take you to their site http://www.mpdi.com And just for completeness http://www.spc.co.jp > The driver does not have any labels on the front panel. On the back > it is labelled: Siemens P/N 196487, MDP P/N 34874/DB 051850-1. > If anybody knows who the manufacturer of the driver is or can share a > copy of technical documentation, any information will be greatly > appreciated. > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Target drive........ Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Target drive........ Date: Wed, 25 Aug 1999 12:17:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy, We had a similar thing on our 2100 (#40). It appears the target air ram had been put in wrongly and the piston was scouring the side of the bore. This caused the thing to allow air past the 'O' ring and hence out the exhaust port of the valve. Eventually the ram failed and a new one was fitted. DaveP. ************************************************** Life is pain,......... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Target drive........ Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Target drive........ Date: Wed, 25 Aug 1999 12:17:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy, We had a similar thing on our 2100 (#40). It appears the target air ram had been put in wrongly and the piston was scouring the side of the bore. This caused the thing to allow air past the 'O' ring and hence out the exhaust port of the valve. Eventually the ram failed and a new one was fitted. DaveP. ************************************************** Life is pain,......... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Nucletron Motor Drivers Message-ID: <862567D8.006A3F70.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: Nucletron Motor Drivers Date: Wed, 25 Aug 1999 11:10:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hey, by the way... Does anybody know where to get the op-amps used to drive shutter and wire motors in Oldelft (Nucletron) Simulix MCs? The ones I've got are Siemens TCA365B, but I've had no luck at all locating any of these. Anybody know a source? Thanks in advance. Tim Waldron ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: FW: Target Control Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: Randy Wick Cc: 'Linac-eng list' Subject: Re: FW: Target Control Date: Wed, 25 Aug 1999 09:06:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy; If you have lots of time on your hands you can adjust the four plungers that are operated by the solenoid armature. There are four small Bristol set screws that allow repositioning/adjusting to eliminate the leakage. We have found it best to rig up a low pressure air supply in the shop to permit Humphrey solenoid valve testing and repair. len On Wed, 25 Aug 1999 09:44:15 -0700 Randy Wick wrote: > We had a similar problem on a 2100CD (I assume you're talking about Varian?) > In our case we couldn't get into electrons, and occasionally 10X. The fix > was to lubricate the shaft with Tri-flow and drive the solenoid back and > forth many, many times. We also put lubricant into the air vent on the > solenoid, which can be seen on the back half. It took a while, but it is > much better now. Apparently the internal O-rings can get dry, maybe due to > the wrong lubricant originally. > > As to the switch logic, I don't remember exactly, but we did note that the > second Humphrey's valve would always have air out of the exhaust port in one > position, which normally is a bad thing but it was replaced and the new one > is the same. > > ----------------------------------- > Randy Wick Radiotherapy Service > > Vancouver Cancer Clinic > Vancouver, BC Canada > > rwick@bccancer.bc.ca > > -----Original Message----- > From: Peter E. Vitali [mailto:peter.vitali@yale.edu] > Sent: Tuesday, August 24, 1999 5:05 AM > To: Linac-Engineers, Listserver > Subject: Target Control > > > Hi all: Have I got a good one. The target will not move to 6X > position. The target goes to the electron position and to the 18X > position. Change the two air solenoids, Humphrys valves twice, measured > the voltages, check the air out of the valves and all seems to be > correct. Suspect the air cylinder. Has anyone seen this problem > before? Also does any one have an idea of the logic that the solenoids > operate with. Which ports are open and which ports are closed for the > different target positions? I have an idea but I need confirmation. ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Target Control Message-ID: From: Randy Wick To: 'Linac-eng list' Subject: FW: Target Control Date: Wed, 25 Aug 1999 08:44:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had a similar problem on a 2100CD (I assume you're talking about Varian?) In our case we couldn't get into electrons, and occasionally 10X. The fix was to lubricate the shaft with Tri-flow and drive the solenoid back and forth many, many times. We also put lubricant into the air vent on the solenoid, which can be seen on the back half. It took a while, but it is much better now. Apparently the internal O-rings can get dry, maybe due to the wrong lubricant originally. As to the switch logic, I don't remember exactly, but we did note that the second Humphrey's valve would always have air out of the exhaust port in one position, which normally is a bad thing but it was replaced and the new one is the same. ----------------------------------- Randy Wick Radiotherapy Service Vancouver Cancer Clinic Vancouver, BC Canada rwick@bccancer.bc.ca -----Original Message----- From: Peter E. Vitali [mailto:peter.vitali@yale.edu] Sent: Tuesday, August 24, 1999 5:05 AM To: Linac-Engineers, Listserver Subject: Target Control Hi all: Have I got a good one. The target will not move to 6X position. The target goes to the electron position and to the 18X position. Change the two air solenoids, Humphrys valves twice, measured the voltages, check the air out of the valves and all seems to be correct. Suspect the air cylinder. Has anyone seen this problem before? Also does any one have an idea of the logic that the solenoids operate with. Which ports are open and which ports are closed for the different target positions? I have an idea but I need confirmation. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Clinac 12 I woke up Message-ID: <37C41884.9AB3CE0F@earthlink.com> From: "Scott A. King" To: linac-eng@plato1.aristotle.net Subject: Clinac 12 I woke up Date: Wed, 25 Aug 1999 08:23:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks for all of your responses, it was pulse cables, I wish that we all could of talked during my ordeal. I found the problem Monday night and spent about 9 hours troubleshooting where as twaldron@notes.mdacc.tmc.edu (TIM) and Mike Lancaster had hit the problem right on the money. I think when I go to the job sight I will take the internet with me. Again thank you all for your help and thanks to Bob from Accelerator Assoc. for his on-sight help. Scott ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Nucletron Motor Drive Message-ID: <99Aug25.093347bst.11701@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: Nucletron Motor Drive Date: Wed, 25 Aug 1999 00:27:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" C'Mon then Andrew, Don't keep us Simulix owners in the dark and share your little secret of the Make and Model of the motor drive. You never know when it may come in useful! Chris Forrest Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RF driver Message-ID: <9908250001.AA12774@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Subject: RF driver Date: Tue, 24 Aug 1999 15:44:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi everybody. Four years ago on our Mevatron KD-2 the original RF driver was replaced with a solid state device. Modification has been done by Siemens and no technical documentation or any sort of manual have been provided. Recently during one of endless breakdowns on this machine the driver was a suspect. We addressed to Siemens asking them to send us some information. The answer was simple: we do not have any, as it is manufactured by the third party (no names), if you suspect it, buy a new one. H-m-m-m...I thought it would be a bit expensive exercise to spend AUS$75,000 to realize that the driver was OK. So we found the fault somewhere else and cleared RF driver this time. But still this driver for us is a black box and if anything happens to it we will not be able to fix it. The driver does not have any labels on the front panel. On the back it is labelled: Siemens P/N 196487, MDP P/N 34874/DB 051850-1. If anybody knows who the manufacturer of the driver is or can share a copy of technical documentation, any information will be greatly appreciated. By the way. Last year I had to buy a new motor drive for Oldelft Simulix. I could not identify manufacturer as the drive marking did not give me any clue. So I ordered one from Nucletron. As they did not have any in Australia it was shipped from the Netherlands by express mail. It arrived in its original package that contained a little manual with manufacturer's name and addresses of agencies around the world (what a mistake by Nucletron).... Ironically the drive was available of shelf in Adelaide and could be delivered within 2 hours instead of 3 days. The price was $500 compared with $1500 from Nucletron. Why do they do it to us? Why do not they play an honest game? Money - you will say. But for our patients time may be priceless....I have been working in this business only for one year. May be I do not understand something... A Frolov Manager, Radiation Engineering RAH Medical Physics Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@cancer.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: PRO-COMM PC-3000 RF Driver Message-ID: <00BE56E17E26D11197CB00805FA6803A010CAB2E@mail.midcentral.co.nz> From: Keith Croft To: 'michael porat' Cc: 'LinacEng' Subject: RE: PRO-COMM PC-3000 RF Driver Date: Tue, 24 Aug 1999 12:43:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Having seen Craig's reply from Auckland thought I would add my 2 cents worth, we got out Pro-Comm a short while before Auckland, it did have a problem shortly after installation, of which got serviced under warrantee - since then it has worked fine. (It is in 2100C #86) Keith Croft Palmerston North Hospital New Zealand. > -----Original Message----- > From: michael porat [SMTP:michaporat@yahoo.com] > Sent: Monday, 23 August 1999 23:23 > To: linac-eng@plato1.aristotle.net > Subject: PRO-COMM PC-3000 RF Driver ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: PRO-COMM PC-3000 RF Driver Message-ID: From: Craig Pearce To: 'michael porat' Cc: 'linac eng' Subject: RE: PRO-COMM PC-3000 RF Driver Date: Mon, 23 Aug 1999 12:02:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Michael We have had a PRO-COMM PC-3000 installed at our site for 4-5 years now. It has given excellent service in that time. We have also had 2 RF drivers rebuilt by pro-comm as well. One rebuild required that the modulator circuit be redesigned due to components being obsolete in the SPC driver. Over all I am happy with the services and products that we have received from Pro-comm. Pro-comm rebuilds are also a more cost effective solution to a RF driver replacement. Now that Varian offer the new style SPC RF drivers in the newer High Energy Clinacs I will be checking with the local Pro-comm agent here to see if these units are rebuildable by Pro-comm. Craig Pearce Technical Officer Medical Physics and Clinical Engineering Auckland Healthcare Services Ltd Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz > -----Original Message----- > From: michael porat [SMTP:michaporat@yahoo.com] > Sent: Monday, 23 August 1999 23:23 > To: linac-eng@plato1.aristotle.net > Subject: PRO-COMM PC-3000 RF Driver > > > > Does anyone have experience with the performance of > the PRO-COMM PC-3000A RF driver? > > Thanks in advance for your information! > > > Michael Porat > Head of Radiotherapy Equipment > Clallit Biomedical Engineering Ltd. > > > > > __________________________________________________ > Do You Yahoo!? > Bid and sell for free at http://auctions.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Target Control Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: "Peter E. Vitali" Cc: "Linac-Engineers, Listserver" Subject: Re: Target Control Date: Tue, 24 Aug 1999 07:15:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter; it sounds like you have a blockage on the "X-2" port of the cylinder. A summary of the operation is: 1/ Hi X: no power to either solenoid valve coil; Air pressure applied to the L2-In port and out via the L2-1 port to the L3-In port and out via the L3-1 port to the cylinder X1 inlet thereby causing the assembly to move fully in to the evacuated wave guide to the Hi-X default position. The L2-2 port is open to exhaust. The L3-2 port is open to exhaust. 2/ Lo X: only the L2 solenoid coil is energized; Air pressure applied to the L2-In port now goes out via the L2-2 port and pressurizes the cylinders X2 inlet causing the cylinder to extend by the stroke of cylinder X2 thereby pulling the assembly away from the waveguide to the Lo-X position. No air pressure is applied to solenoid valve L3 so it's only function now is to allow exhaust from cylinder port E out via L3-Exh. port. 3/ electrons: only the L3 solenoid coil is energized; Air pressure applied to L2-In port goes out via the L2-In port to the L3-In port and out of the L3-2 port to the air cylinder E inlet. The air cylinder pulls the assembly out/away from the evacuated waveguide by the longer stroke length of cylinder E and thereby moves the open/ non-target into position. The two pistons in the air cylinder aren't mechanically connected...the Lo-X piston can only push against the E piston...very clever, but also somewhat confusing. Good luck. On Tue, 24 Aug 1999 08:05:14 -0400 "Peter E. Vitali" wrote: > Hi all: Have I got a good one. The target will not move to 6X > position. The target goes to the electron position and to the 18X > position. Change the two air solenoids, Humphrys valves twice, measured > the voltages, check the air out of the valves and all seems to be > correct. Suspect the air cylinder. Has anyone seen this problem > before? Also does any one have an idea of the logic that the solenoids > operate with. Which ports are open and which ports are closed for the > different target positions? I have an idea but I need confirmation. > > > Thanks > > Peter E. Vitali, CBET > Therapeutic Radiological Engineer > Department of Radiation Physics > Yale-New Haven Hospital > 15 York Street > New Haven, CT. 06504 U.S.A. > Tel: 203 688-2948 > Fax: 203 688-3663 > E-Mail: peter.vitali@yale.edu > > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Target Control Message-ID: <37C28A75.92D0BC12@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" Subject: Target Control Date: Tue, 24 Aug 1999 04:05:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all: Have I got a good one. The target will not move to 6X position. The target goes to the electron position and to the 18X position. Change the two air solenoids, Humphrys valves twice, measured the voltages, check the air out of the valves and all seems to be correct. Suspect the air cylinder. Has anyone seen this problem before? Also does any one have an idea of the logic that the solenoids operate with. Which ports are open and which ports are closed for the different target positions? I have an idea but I need confirmation. Thanks Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Technical Options of Georgia Message-ID: <8c00e105.24f35208@aol.com> From: Accelinear@aol.com To: LINAC-ENG@plato1.aristotle.net Subject: Technical Options of Georgia Date: Mon, 23 Aug 1999 17:40:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I wish to clear up what seems to be a general misunderstanding regarding the recent change of ownership of Technical Options of Georgia Inc. (TOG). TOG was recently purchased and is being operated as a wholly owned but independently run subsidiary of ACCELINEAR SERVICE COMPANY, AKA - ACCELINEAR of Ramsey, New Jersey. While Richard Pecha, founder and past president of TOG has stepped down from his position to take a well deserved break he will remain on with Accelinear as a long term consultant to the parent company and will certainly participate in much of our growth in the years to come. Von Bergholm, vice president, will remain on as chief of operations. (Its been rumored he also sweeps the floor). He will direct the future growth of TOG which will soon cover a much wider variety of parts. These are scheduled to include all styles of beam structures including most Siemens (TM) and Varian(TM) equivalents. Structures from TOG will be priced competitively and have warrantees far surpassing those of the OEMs. Before long, TOG will also begin to stock a wide variety of replacement parts for many Siemens(TM) linacs. The bottom line though, is that Technical Options of Georgia will continue to be the cost effective alternative to the high prices of OEMs for ISOs and end users alike. One final note. Unlike Varian which has taken some ISOs to court to ensure that they can use their monopoly on many parts to leverage their position in the service market, Accelinear has pledged to leave TOG independent so as to treat all customers fairly. Small ISOs that frequently purchase parts from TOG and pay on standard terms will receive wholesale purchase discounts equivalent to the "Big Boys". As we too started only a few years ago we are quite sensitive to the needs of the small startup ISO and hope to enable your growth. Thank you, Martin Shapiro PE Sr. Vice President, Accelinear Company ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian Cl-12 Nightmare Message-ID: <862567D6.0076143C.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: "Scott A. King" Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian Cl-12 Nightmare Date: Mon, 23 Aug 1999 13:19:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A "normal" PFN signal would indicate that the PFN is discharging through something, and apparently that something is somewhere before the secondary of the pulse tank. Thyrites do fail, and without any obvious visible indication, if I remember correctly (although its been a while, to be honest). The clipper getting hot is certainly suspicious. I would replace those diodes first and the thyrites. If they're not bad, they are probably stressed. SOMETHING is causing enough current flow to make them hot. Is the de-spiking capacitor shorted (if there is a de-spiking network on your machine)? This will give you "no" MagI, or not much at any rate. -And for a suprisingly long time before the flames begin! Does this machine have pulse cables in the windup? Have these been checked? These things, along with your basic symptoms, should also be giving you MOD faults, but if the PFN signal is "normal", then this is what is left.. How about this: If you look at 3 or 4 PFN cycles on the scope, is it charging to the same and proper value each cycle? Is it discharging all the way to 0 volts when it discharges? Tim ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 2100C RF Circulator Message-ID: <0F5B9F57891AD211BF2100805FA7316C4E5447@PHSORMSG03> From: "Stober, Gary" To: 'Linacnew' Subject: Varian 2100C RF Circulator Date: Mon, 23 Aug 1999 10:55:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen, I have a gas leak in the rf circulator, a Raytheon model CSH-90. Looks like it's coming from the flange at the top of the circulator and at the bottom of the piece that splits off to the water load and the Tdrive. My questions are, what kind of seal is used there and does anyone know where I can buy them? Is it, perhaps, a larger version of the waveguide seals? Or does anyone know of a second source for the circulator, or have a current phone number for Raytheon? Thanks in advance. Gary Stober Biomedical Technician (and occasional linac mechanic) St. Vincent Hospital Portland, OR USA (503) 216-2988 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: PRO-COMM PC-3000 RF Driver Message-ID: <199908231617.LAA28264@ogopogo.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: michael porat , linac-eng@plato1.aristotle.net Subject: Re: PRO-COMM PC-3000 RF Driver Date: Mon, 23 Aug 1999 08:16:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > > > Does anyone have experience with the performance of > the PRO-COMM PC-3000A RF driver? > > Thanks in advance for your information! > > > Michael Porat > Head of Radiotherapy Equipment > Clallit Biomedical Engineering Ltd. > > > > > __________________________________________________ > Do You Yahoo!? > Bid and sell for free at http://auctions.yahoo.com > > We purchased one for a customer here in Texas to replace the original driver in a CL-18. It worked fine for about 8 months or so, it then lost all output. They shipped us a spare overnight to use while the other was repaired. It turned out that the RF trigger to the driver from the Clinac was too large, and had blown the input transistor in the driver. After it was repaired and re-installed, we put a 50 ohm load in parallel with the trigger line, and it has been fine since then. Overall impression with pro-comm drivers - Good reliability, and good service from Pro-Comm. If anyone has any experience with Pro-Comm drivers in a Siemens machine, I would be interested in hearing about it. Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: VB: communication error Clinac 2100C Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB442@liosex1.lio.se> From: Viking Eilert To: "Linac-Eng (E-post)" Subject: VB: communication error Clinac 2100C Date: Mon, 23 Aug 1999 05:22:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello list. I would like to thank all of you responding on the problem below. I'll = come back and let you know if we solve the problem.=20 Eilert=20 =20 > aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa >=20 > Hello linac list. >=20 > We have a Clinac 2100C #248. It was upgraded to version 5,4 and at = the > same > time Varian replaced the IBM PC to a pentium Dell optiplex. Ever = since we > have had communication error which locks the Dell PC approximately = once a > day (some times maybe five times a day and outer times maybe not for = a > couple of days). We havn't noticed any particular times when the = error > occour. Rather often it happens during the nights when the machine is = in > standby. >=20 > The only way to solve the problem is to reset the STD bus (or = shutting the > machine off and on), then it works fine for a while. >=20 > Our local Varian office doesn't know what causes the problem. First = they > asked us to replace the communication and controller microprocessor = PCB > to > a vendor revision number 17 or above. We replaced them but it didn't = help. > Could it be the Dell PC or the security module on the printer port of = the > PC? >=20 > We have know replaced all the PCB (beside the ADC, which we will = replace) > in > the STD bus without any luck. >=20 > Have anyone of you out there on the list heard of a simular problem = or > have > any suggestions? >=20 >=20 >=20 > Symptoms: >=20 > 1. The LED on the control microprocessor PCB always shows 01 hex, = digital > output read back failure. > 2. The LED on the communication microprocessor PCB is ok (FF hex). > 3. No info is stored in the Event log file. > 4. If you reboot the Dell PC (when you have the comm error) it = sometimes > shows on the screen: >=20 > Installed versions 5,4,05 console software 1102194-10, comm software > 01x*+0=A7/&=3D?...... (or some other rubbish characters), incorrect = comm > firmware installed, incorrect controller firmware installed. >=20 > or >=20 > Communication failed reading firmware version - data 24 (or data 26) >=20 > 5. No communication is possible from the machine to the Dell PC. We = have > tried to look in service mode at the hex codes = in > the > common RAM, but I don't know if it have any relevant information = because > of > the lack of proper communication. The hex codes for = > shows F1 or FD (should be 01 ?) and the shows = F1 or > FF. >=20 > Thank you=20 > Eilert Viking >=20 > Universitetssjukhuset i Link=F6ping Eilert Viking > O-centrum telefon: +46-13 222805 > Radiofysikavdelningen fax: +46-13 222895 > Sjukhusfysik Eilert.Viking@lio.se > S-581 85 Link=F6ping > Sweden > telefon: +46-13 222000 >=20 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian Cl-12 Nightmare Message-ID: <002801beed65$8147d1c0$cef81004@whoknows> From: Richard Kimball To: "Scott A. King" , linac-eng@plato1.aristotle.net Subject: Re: Varian Cl-12 Nightmare Date: Mon, 23 Aug 1999 04:46:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Scott, I don't envy your plight, and not ever having seen a CL-12, I am not sure how everything is wired up. I had an identical problem on a Linatron 6 once, where everything in the modulator was normal but would not fire the maggie. We did everything you have done so far. Turns out that the gun leads were shorted and since the gun HV was taped from the pulse tank, there is where the current went (hence no pulse I). I know that your CL-12 must have a grided gun, but what I don't know is where it gets it's HV drive. If it is from the pulse tank through a resistor network, I would disconnect the gun leads and look for your pulse current. You could also create a 25ohm resistive network (the load that the pulse tank would want to see in place of a magnetron) that would dissipate enough current for a MOMENTARY pulse (just long enough to view your pulse I on the scope). Two large wattage 50ohm resistors in parallel would do the trick. The de-spiking network on many linacs provide these. If you hook this up across the pulse tank output leads, you should see normal discharge of the PFN. WARNING: Do not run your modulator into this resistive load for more than 1 second!!!! You will burn up the resistors and open the load, firing the PFN into an open connection......not a good idea. The end clipper getting warm is normal, as it always conducts slightly. Having to replace your rectifier diodes might indicate that your modulator was firing into a short, hence the above scenario. Good luck. Keep us informed. Rich Kimball ----- Original Message ----- From: Scott A. King To: Sent: Monday, August 23, 1999 4:00 AM Subject: Varian Cl-12 Nightmare > Gentlemen put on your thinking caps. I have a Varian Cl-12 (bet some of > you didn't know of this model) it is a magnetron driven Clinac 18. I > have a strange modulator problem, it has normal HVPS I signal (% > dequeing) and a normal PFN signal, here's the problem, I have no Magie > current. It is not a fake out, I have checked toriod. I think the > voltage is being dump into the end clipper and through the thyrites (sp) > part # GE 71W30100, I have a 5 volt signal out of the toriod ( .1 > volt/amp) in the end clipper and the schematic says a 10 volt signal > will trip the Mod fault. I think I might have a mismatch in my > modulator, I have visually check the thyrites (sp) if you can do that > and I didn't see anything that looked bad. I have tried the following; > a different pulse transformer, and a magnetron. The end clipper diodes > are good but when I run the modulator the thyrites and the end clipper > resistor gets hot. Also may or may not be related, I had to replace the > HVPS rectifier diodes. > > If anyone has any ideas please respond ASAP. > > Thank you, > > Scott ________________________________________________________ NetZero - We believe in a FREE Internet. Shouldn't you? Get your FREE Internet Access and Email at http://www.netzero.net/download/index.html ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: PRO-COMM PC-3000 RF Driver Message-ID: <003801beed66$4c747420$cef81004@whoknows> From: Richard Kimball To: michael porat , linac-eng@plato1.aristotle.net Subject: Re: PRO-COMM PC-3000 RF Driver Date: Mon, 23 Aug 1999 04:52:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Caveat Emptor. It has taken many attempts to get one that worked properly. The company is good to work with however, and has excellent support. Rich Kimball ----- Original Message ----- From: michael porat To: Sent: Monday, August 23, 1999 6:23 AM Subject: PRO-COMM PC-3000 RF Driver > > > Does anyone have experience with the performance of > the PRO-COMM PC-3000A RF driver? > > Thanks in advance for your information! > > > Michael Porat > Head of Radiotherapy Equipment > Clallit Biomedical Engineering Ltd. > > > > > __________________________________________________ > Do You Yahoo!? > Bid and sell for free at http://auctions.yahoo.com ________________________________________________________ NetZero - We believe in a FREE Internet. Shouldn't you? Get your FREE Internet Access and Email at http://www.netzero.net/download/index.html ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: PRO-COMM PC-3000 RF Driver Message-ID: <19990823112311.19034.rocketmail@web110.yahoomail.com> From: michael porat To: linac-eng@plato1.aristotle.net Subject: PRO-COMM PC-3000 RF Driver Date: Mon, 23 Aug 1999 03:23:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone have experience with the performance of the PRO-COMM PC-3000A RF driver? Thanks in advance for your information! Michael Porat Head of Radiotherapy Equipment Clallit Biomedical Engineering Ltd. __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: PRO-COMM PC-3000 RF Driver Message-ID: <19990823112311.19034.rocketmail@web110.yahoomail.com> From: michael porat To: linac-eng@plato1.aristotle.net Subject: PRO-COMM PC-3000 RF Driver Date: Mon, 23 Aug 1999 03:23:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone have experience with the performance of the PRO-COMM PC-3000A RF driver? Thanks in advance for your information! Michael Porat Head of Radiotherapy Equipment Clallit Biomedical Engineering Ltd. __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD Spike - more Message-ID: <199908231053.FAA24087@plato1.aristotle.net> From: Paul Twyman To: Jiri Bocanek , linac-eng@plato1.aristotle.net Subject: 600CD Spike - more Date: Mon, 23 Aug 1999 03:50:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all We have checked our de-spiking network attached to the pulse cable and all appears to be well. We have also had our cable on the flow meter disconnected since installation. I will check the MAG I monitoring co-ax tonight and try to establish if we are seeing a monitoring induced spike. Since starting this discussion on linac-eng our local service organisation has obtained an illusive modification and is attending site on Thursday 26th Aug to install it. I will let you all know the out come. Thankyou for all of the advice and help that has been forthcoming. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: (Fwd) 600CD Spike - more Message-ID: <199908231055.FAA24122@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: (Fwd) 600CD Spike - more Date: Mon, 23 Aug 1999 03:52:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Forwarded message: From: Self To: "Jiri Bocanek" ,linac-eng@plato.aristotle.net Subject: 600CD Spike - more Date: Mon, 23 Aug 1999 11:03:44 Hello all We have checked our de-spiking network attached to the pulse cable and all appears to be well. We have also had our cable on the flow meter disconnected since installation. I will check the MAG I monitoring co-ax tonight and try to establish if we are seeing a monitoring induced spike. Since starting this discussion on linac-eng our local service organisation has obtained an illusive modification and is attending site on Thursday 26th Aug to install it. I will let you all know the out come. Thankyou for all of the advice and help that has been forthcoming. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Cl-12 Nightmare Message-ID: <37C10DA3.4D588126@earthlink.com> From: "Scott A. King" To: linac-eng@plato1.aristotle.net Subject: Varian Cl-12 Nightmare Date: Mon, 23 Aug 1999 01:00:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen put on your thinking caps. I have a Varian Cl-12 (bet some of you didn't know of this model) it is a magnetron driven Clinac 18. I have a strange modulator problem, it has normal HVPS I signal (% dequeing) and a normal PFN signal, here's the problem, I have no Magie current. It is not a fake out, I have checked toriod. I think the voltage is being dump into the end clipper and through the thyrites (sp) part # GE 71W30100, I have a 5 volt signal out of the toriod ( .1 volt/amp) in the end clipper and the schematic says a 10 volt signal will trip the Mod fault. I think I might have a mismatch in my modulator, I have visually check the thyrites (sp) if you can do that and I didn't see anything that looked bad. I have tried the following; a different pulse transformer, and a magnetron. The end clipper diodes are good but when I run the modulator the thyrites and the end clipper resistor gets hot. Also may or may not be related, I had to replace the HVPS rectifier diodes. If anyone has any ideas please respond ASAP. Thank you, Scott ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Philips RT100 - drop in mA -Reply Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Philips RT100 - drop in mA -Reply Date: Sun, 22 Aug 1999 14:24:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have had similar problems at times here and found the mA adjusters do oxidise and have bad contacts. We have improved these with contact cleaners, light emery paper wipe etc. Good luck, Dave., PS does anyone have a 'spare' tube ??????? ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: CDOS Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: CDOS Date: Sun, 22 Aug 1999 14:19:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, We have alsways been bothered by the nuisance CDOS. They are used by the PV system to terminate beam after sufficient beam pulses to create an image. They do, however, create a diag-dump file for a 'normal' beam termination. As we check our DD files regularly it has a genuine nuisance value and I hope V is taking steps (perhaps already in done) to stop CDOS filling my day with rubbish. Dave Pinchin. ************************************************** There's only one sure thing in life, and that's doubt.......I think. from - Good bye Pork Pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Ximatron Computer Replacement Message-ID: <002801beec98$7bb69520$f9f81004@whoknows> From: Richard Kimball To: Domenic Greco , Linac Engineers Subject: Re: Ximatron Computer Replacement Date: Sun, 22 Aug 1999 04:18:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Domenic Is it possible that this Dell Optiplex is too fast? Not being around the early Xim's for a while, I don't recall what computer it uses. Wasn't it a 80286? If so, the software may have severe problems running on such a fast processor. I would suggest trying a 486 machine if one was available. Please keep us informed of your progress. Rich Kimball ----- Original Message ----- From: Domenic Greco To: Linac Engineers Sent: Saturday, August 21, 1999 9:12 PM Subject: Ximatron Computer Replacement I recently attempted replacing the IBM computer on a Varian Ximatron with an off the shelf Dell Optiplex (400mhz). I transferred the RS422 card over from the IBM but my problem is that it doesn't work when installed in the Dell, that is, it won't communicate with the Ximatron. I've tried numerous configurations and cable types without success. The 422 card is a "Hardware/Software Systems Intl" and the Dell was formatted and configured with DOS and the Xim Software. Any suggestions on what I'm overlooking? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron Computer Replacement Message-ID: <006301beec43$c8053120$7d12fea9@pacbell.net> From: Domenic Greco To: Linac Engineers Subject: Ximatron Computer Replacement Date: Sat, 21 Aug 1999 18:12:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I recently attempted replacing the IBM computer on a Varian Ximatron with an off the shelf Dell Optiplex (400mhz). I transferred the RS422 card over from the IBM but my problem is that it doesn't work when installed in the Dell, that is, it won't communicate with the Ximatron. I've tried numerous configurations and cable types without success. The 422 card is a "Hardware/Software Systems Intl" and the Dell was formatted and configured with DOS and the Xim Software. Any suggestions on what I'm overlooking? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Modulator problems. Message-ID: <44c74ef8.24f00400@aol.com> From: Accelinear@aol.com To: mawm82@[158.43.128.67], linac-eng@plato1.aristotle.net Subject: Re: Modulator problems. Date: Sat, 21 Aug 1999 05:30:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" You're very likely have a problem with your pulse transformer. These newer transformers have been quite problematic (compared to the older style). The despiking load is not likely to be the source of your problem as it isn't really needed (electrically speaking) in this application though it doesn't hurt. I have seen these systems test fine with no despiking load in the circuit. Other manufacturers of similar modulators (ones that use this magnetron and duty cycle) have found them unnecessary. If your tap(s) was wrong you would likely have a mirror image bump just before the falling edge. That's just how pfns discharge. One note: apparently Stangenese, the manufacturer of Varian's pulse transformers, doesn't test these transformers in an identical modulator. I recently had one of these transformers fail in a not so dissimilar manner. It was returned to the manufacturer for inspection and rebuild. The manufacturer thoroughly inspected and tested the transformer but could find no defect. Upon reinstallation into a 600C the identical problem was experienced. This is not meant to be a poor reflection on Stangenese, just the opposite, they are probably the finest manufacturer of high performance inductors/transformers in the world. Its just that strange things happen at times with this type of transformer. The good news is the a new transformer really isn't that expensive or difficult to replace. As to your line on your PV, is the dose rate servo switched into PV mode in the console? If the machine is operating on the standard dose rate control method where the unneeded pulses are dropped, those dropped pulses would appear as lines. I'm sure your know that in PV mode the dose rate servo attempts to evenly time the pulses. It's not as accurate for dose rate but it helps improve the image. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 600CD Spike Message-ID: <00ae01beead9$fda4ee80$0201010a@py.internet.sk> From: Jiri Bocanek To: Chris FORREST , linac-eng@plato1.aristotle.net Subject: Re: 600CD Spike Date: Thu, 19 Aug 1999 22:59:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello All, Yes Chris, this despiking network was built into modulator of LE = Machines to prevent overshoot of MAG I which causes horizontal lines in PVI image. = It may be built in also in older machines. Can You have a look in Data = Book and let us know what values they are? Paul, Your flow faults have nothing = to do with MAG I. There is simple solution, disconnect Cable from Flow meter = on PCB side. Jiri Bocanek National Cancer Institute Bratislava, Slovakia --------------------------------------------------- Od: Chris FORREST Komu: Odesl=E1no: 19. srpna 1999 13:21 Subject: 600CD Spike > Paul, > > Our 1990 600C has a de-spiking RC network on the o/p of the = modulator, just before the pulse cables. Does your 600CD have one? If so, is it working?? > > Chris Forrest > Cookridge Hosp. > Leeds UK > Hello to all again. _________________________________________________-___ I would like to clarify my previous email about Modulator problems. Please ignore the portal image problems as they are not the major issue here. They only highlighted that there is a deeper problem. The problem is that the machine has suffered from large numbers of unexplained ACC, COLL and FLOW faults since it was bolted down at our site. The MAG I pulse is aweful and the machine has eaten a Magnetron in approx 18 months. Do other 600CD owners have170 amp 0.2 micro sec spikes on the leading edges on their MAG I pulse and does it cause the above mentioned faults. Has an one else out there heard of a modification from Varian to rectify this spike. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Yield faults on a Varian Clinac 6/100 Message-ID: <9908192327.AB13751@yoyo.rah.sa.gov.au> From: David Horsman To: linac-eng@plato1.aristotle.net Subject: RE: Yield faults on a Varian Clinac 6/100 Date: Thu, 19 Aug 1999 14:11:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks to all who replied. As the linac is still usable, (it doesn't interlock all of the time) I don't have immediate access. I will keep you informed as to what I find. David Horsman dhorsman@cancer.rah.sa.gov.au Royal Adelaide Hospital Ph 08 8222 4188 Fx 08 8222 5937 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1EB2C38D998ED211B83400805F853AFE081F08@europa.emh.org> From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Date: Thu, 19 Aug 1999 13:43:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I should learn to proof read after using spell check. On my last post you will see ISAAC.....that should be IAS2. Mike Denning Eastern Maine Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1EB2C38D998ED211B83400805F853AFE081F07@europa.emh.org> From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Date: Thu, 19 Aug 1999 12:52:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Varian 2100CD 1163....Mk 2 Portalvision installed. CDOS interlocks. Has anyone had trouble with this interlock with their PV installation? Is the CDOS interlock used to beam off the machine when the ISAAC has enough dose for an image? Am I chasing a red herring with PV and the CDOS interlock. Mike Denning Eastern Maine Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Modulator problems. Message-ID: <862567D2.0069E9CB.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: Modulator problems. Date: Thu, 19 Aug 1999 11:06:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Not that the leading edges of our 600C MagI pulses are exactly flat, but 170 A seems rather high. The other postings are correct in their direction: I would investigate the despiking network (maybe the capacitor is open), then the connections between the PFN coil and the capacitor bank. Those just clip to the coil, so there's opportunities for bad connections. Be careful to mark them before disconnecting. I find it difficult to believe that the factory didn't optimize the PFN "taps" correctly, so I would not rush to move them around to much. After that, I think there is a network in the pulse transformer whose failure MIGHT cause that. Our MagI leading edges peak out (first ring) at around 115-120A. We've never felt compelled to adjust that out, but I've been through the exercise on other machines. A digital or storage 'scope is very handy for comparisons when optimizing this, as is a general fastidiousness in tracking what one is doing. Best wishes, TimW ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fw: Modulator problems. Message-ID: <003001beea63$d0206b40$65541fc4@will> From: Will Pazda To: "L-Soft list server at LISTS.WAYNE.EDU (1.8c)" , linac-eng@plato1.aristotle.net Subject: Fw: Modulator problems. Date: Thu, 19 Aug 1999 08:56:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ----- Original Message ----- From: Will Pazda To: Paul Twyman Sent: 19 August 1999 18:50 Subject: Re: Modulator problems. > Hi Paul, > > I don't know your unit but I would like to offer the following for > consideration. Are you sure that what you see on your scope regarding the > Mag I pulse is the real Mag I pulse. I am assuming that you are looking at > this pulse on a long lead of co-ax coming directly from the modulator in the > treatment room. I have had the situation where depending on how long the > monitoring cable is and against what it is routed has caused reactance > (mismatch) problems which manifest in 'ringing' on fast rising signals. I > sorted out my problem by putting a small decoupling cap. directly at the > input to the scope and then got to see the real Mag I pulse. I'm not saying > that this is your problem but you mention 0.2 uSec and this seems > suspicially close to a 'ringing' frequnecy. Please don't get mislead by > possible monitoring errors, sorry I can't offer more. Hope this helps. > > Regards, Will > > ----- Original Message ----- > From: Paul Twyman > To: > Sent: 19 August 1999 12:21 > Subject: Modulator problems. > > > > Hello to all again. > > I would like to clarify my previous email about Modulator problems. > > Please ignore the portal image problems as they are not the major > > issue here. They only highlighted that there is a deeper problem. > > The problem is that the machine has suffered from large numbers of > > unexplained ACC, COLL and FLOW faults since it was bolted down at our > > site. The MAG I pulse is aweful and the machine has eaten a Magnetron > > in approx 18 months. > > Do other 600CD owners have170 amp 0.2 micro sec spikes on the leading > > edges on their MAG I pulse and does it cause the above mentioned > > faults. Has an one else out there heard of a modification from Varian > > to rectify this spike. > > Paul Twyman > > Technical officer > > Medical physics dept > > Box 152 > > Addenbrookes hosp > > Hills road > > Cambridge > > CB2 2QQ > > England > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Yield faults on a Varian Clinac 6/100 Message-ID: From: "Nelson, Steve" To: 'David Horsman' , 'LinacEng' Subject: RE: Yield faults on a Varian Clinac 6/100 Date: Thu, 19 Aug 1999 03:47:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" David, Sounds like what we had going on here during acceptance of our new 600c/d last week. Look for some low PFN pulses. If they occur when these yield faults arise, the problem is likely positioning of the pulse cable from the transformer to the maggie. At least that is what it turned out to be here. We thought that it was the PFN monitor board because the problem seemed to go away when swapped. But I understand that it was a cable routing problem in the end. (I was not present for the final diagnosis) Happy hunting! sjn Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 843-792-3271 nelson@radonc.musc.edu > -----Original Message----- > From: David Horsman [SMTP:Dhorsman@mail.rah.sa.gov.au] > Sent: Wednesday, August 18, 1999 9:50 PM > To: 'LinacEng' > Subject: Yield faults on a Varian Clinac 6/100 > > Hello all, > > I'm after a bit of advice on setting and adjusting the magnetron > filament voltage on a Clinac 6/100. > > A couple of weeks ago the machine started giving yield faults after > delivering 0.05 MU. I am aware that the yield interlock does not > operate for the first couple of seconds after turning on the beam so > that the output has time to stabilise. Obviously the interlock was > tripping as soon as it was enabled. I found that if the yield interlock > was overridden until the output stabilised, then enabled again, the > machine would not interlock. So the machine only had a yield > problem in the first few seconds of operation. I observed that if the > machine was left for five minutes or more, the dose rate was slow > to peak when first beamed on. If it was turned off, then straight > back on again, the dose rate would peak much quicker. > > I have checked the AFC servo and the Yield servo. Both operate > correctly and react quickly when the machine is beamed on. > Anyway, neither should be affected by the amount of time since > the machine was last operated. > > I have observed the forward power produced when the beam is > turned on and noticed that this is slow to peak, and the time to > reach peak output is dependent on how long since the machine > was last operated. It has been suggested that the magnetron > filament voltage may be a bit low, hence the filament gets too cold > if the magnetron hasn't been used for a few minutes. I have never > had to set a magnetron filament voltage before and do not have a > procedure. Does anyone have any worldly advice? Are there any > risks I should be aware of? I was going to increment the voltage > slowly and examine the effect on forward power. What sort of > voltage increments are safe? What will I see if the filament voltage > is too high, magnetron arcing? > > In case anyone asks, I don't know how old the magnetron is. > > Thanks in advance, > > David Horsman > dhorsman@cancer.rah.sa.gov.au > Royal Adelaide Hospital > Ph 08 8222 4188 > Fx 08 8222 5937 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600CD Spike Message-ID: <99Aug19.122644bst.11649@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: 600CD Spike Date: Thu, 19 Aug 1999 03:21:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Paul, Our 1990 600C has a de-spiking RC network on the o/p of the modulator, just before the pulse cables. Does your 600CD have one? If so, is it working?? Chris Forrest Cookridge Hosp. Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Modulator problems. Message-ID: <199908190924.EAA18785@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: Modulator problems. Date: Thu, 19 Aug 1999 02:21:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all again. I would like to clarify my previous email about Modulator problems. Please ignore the portal image problems as they are not the major issue here. They only highlighted that there is a deeper problem. The problem is that the machine has suffered from large numbers of unexplained ACC, COLL and FLOW faults since it was bolted down at our site. The MAG I pulse is aweful and the machine has eaten a Magnetron in approx 18 months. Do other 600CD owners have170 amp 0.2 micro sec spikes on the leading edges on their MAG I pulse and does it cause the above mentioned faults. Has an one else out there heard of a modification from Varian to rectify this spike. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Modulator problems Message-ID: <735AFCF366C6D211B1FF00A0C9EA2A4D0F6C95@exchange-5.orebroll.se> From: terry.kearey@orebroll.se To: KeithC@midcentral.co.nz, mawm82@[158.43.128.67] Cc: linac-eng@plato1.aristotle.net Subject: SV: Modulator problems Date: Wed, 18 Aug 1999 23:41:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I don't have any experience of the 600C, only the 2100. I am assuming = though that the techniques are similar. If, by lines, you mean horizontal bands 1) Try switching off the PFN servo and see if it improves. We get a considerable improvement but cannot run clinically, of course, with = the PFN servo off. The PV pulse length servo could perhaps be optimised. 2) If you mean lines, I've seen this with failing HV mux switches in = the PV system. In this case the lines get worse from image to image if you = scan continuously. A reduction in the cassette HV can give a very temporary improvement. The HV mux circuits are the obsolete components previously mentioned here. It doesn't seem logical that lines, ie whole HV sweep lines in the PV = can be caused by the modulator. It seems more likely that a modulator fault = would cover several lines ie a band or part of a line. Not with any great confidence that this is going to help Ter. > -----Ursprungligt meddelande----- > Fr=E5n: Keith Croft [SMTP:KeithC@midcentral.co.nz] > Skickat: den 18 augusti 1999 23:18 > Till: 'Paul Twyman' > Kopia: 'LinacEng' > =C4mne: RE: Modulator problems >=20 > I have never been on a service course for a 600C or otherwise, but on = the > Service course for the 2100C mention was made of shaping the = modulator > pulse by altering the position of the taps from the PFN capacitor to = the > coil. Sounds like the first capacitor has it tap position too near = the end > of the coil - hence little inductance to limit the current. >=20 > Keith > Palmerston North > New Zealand. >=20 > -----Original Message----- > From: Paul Twyman [mailto:mawm82@[158.43.128.67]] > Sent: Wednesday, August 18, 1999 11:50 PM > To: linac-eng@plato1.aristotle.net > Subject: Modulator problems >=20 >=20 > Hello to all fellow subscribers > I have a long standing problem on a Clinac 600 CD ser no 505. > When the machine was installed it was noted that there were=20 > horizontal lines on the PV images. It was not possible to calibrate=20 > them out and they were not in the same place on consecutive=20 > aquisitions. The installation engineer also had problems with=20 > FLOW,ACC and COLL interlocks randomly appearing and shutting beam=20 > off. the cure for the FLOW fault was to disconnect the flow read out=20 > display on the gantry. The problem was said to be RF noise. > Subsequent to installation we have continued having these problems=20 > and have noted that the Mag I pulse is not normal. The leading edge=20 > reaches a max of approx. 170amps for 0.2 micro secs before it reduces = > to the normal 105 amps as for this type of Magnetron.The machine is=20 > less than two years old and has recenctly eaten our first=20 > magnetron. An EEV report suggests that the failure was due to the Mag = > I pulse and that this in turn is a Modulator problem. Something to do = > with anode emmission sites having been created within the Magnetron.=20 > When EEV tried to run the deceased Magnetron it wouldn't. > Apparently the new 600CD's coming out of the factory have a=20 > modification to prevent the Magnetron, and the gun I suppose, from=20 > seeing the large spike.=09 > My question is - Does anyone else out there suffer from this problem >=20 > and if so what has been done about it by Varian?=09 >=20 > We have notified Varian about this problem on many occassions (since >=20 > acceptance of the machine) and we are still waiting for a=20 > modification. The Modulator has now cost us =A313K due to the the = early=20 > loss of a magnetron and perhaps they could see their way clear of=20 > replacing it FOC. Of course our new Magnetron is now suffering in the = > same treatment and it would be very sad if it failed in a similar=20 > manor. >=20 > Yours - fairly fed up! > Paul Twyman > Paul Twyman > Technical officer > Medical physics dept > Box 152 > Addenbrookes hosp > Hills road > Cambridge > CB2 2QQ > England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RT100/ 6/100 Yield faults Message-ID: <99Aug19.083618bst.11650@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: RT100/ 6/100 Yield faults Date: Wed, 18 Aug 1999 23:31:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" 1) John McMillan's Rt100 mA problem: John, before going to the expense of a new tube I would check the condition of the coarse and fine "mA set" rheostats CAR3, CAR2, CAR4. We had an identical problem to yours and shifting the wiper onto a different part of the winding does the trick. (Tap them while the fault is on to see if mA changes) 2) David Horsman's 6/100 Yield problem: Tell me David, do you see the yield servo LEDs swing hard over to one side after the first couple of seconds of beam on, then slowly come back again? If so, I have seen two reasons for this. a) A stuck AFC motor. The Mag Tuner motor sticks at position where the Mag is on tune when warmed up so that the yield servo goes "ouch" when you beam on cold and tries to tweak up the mag I to keep the energy within spec until the Maggie settles. b) Check the Target I when beaming on. If you see it slowly increase to maximum (It should shoot straight up to max within a second or two NOT 15 secs or so) then your gun emission has dropped either because your Gun Fil volts are low or the gun is worn out. What happens is as the gun emission falls with age, The original value of standby Volts is no longer sufficient to provide enough emission at startup. As the beam runs, the back bombardment of electrons warms the gun up further (or something like that!) , hence the target I increases after running for a short time. A good way to confirm this is to measure the length of time it takes for the target I to reach maximum, then increase your Gun volts by a small amount, then time it again. If the time comes down, this is likely to be your problem. The fix? Well, we had to replace our guide but I once heard an "expert" say that we could increase our Gun Volts permanently - but that sounded like putting off the inevitable to me! Chris Forrest Linac Mender Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Yield faults on a Varian Clinac 6/100 Message-ID: <9908190306.AB18307@yoyo.rah.sa.gov.au> From: David Horsman To: 'LinacEng' Subject: Yield faults on a Varian Clinac 6/100 Date: Wed, 18 Aug 1999 17:49:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, I'm after a bit of advice on setting and adjusting the magnetron filament voltage on a Clinac 6/100. A couple of weeks ago the machine started giving yield faults after delivering 0.05 MU. I am aware that the yield interlock does not operate for the first couple of seconds after turning on the beam so that the output has time to stabilise. Obviously the interlock was tripping as soon as it was enabled. I found that if the yield interlock was overridden until the output stabilised, then enabled again, the machine would not interlock. So the machine only had a yield problem in the first few seconds of operation. I observed that if the machine was left for five minutes or more, the dose rate was slow to peak when first beamed on. If it was turned off, then straight back on again, the dose rate would peak much quicker. I have checked the AFC servo and the Yield servo. Both operate correctly and react quickly when the machine is beamed on. Anyway, neither should be affected by the amount of time since the machine was last operated. I have observed the forward power produced when the beam is turned on and noticed that this is slow to peak, and the time to reach peak output is dependent on how long since the machine was last operated. It has been suggested that the magnetron filament voltage may be a bit low, hence the filament gets too cold if the magnetron hasn't been used for a few minutes. I have never had to set a magnetron filament voltage before and do not have a procedure. Does anyone have any worldly advice? Are there any risks I should be aware of? I was going to increment the voltage slowly and examine the effect on forward power. What sort of voltage increments are safe? What will I see if the filament voltage is too high, magnetron arcing? In case anyone asks, I don't know how old the magnetron is. Thanks in advance, David Horsman dhorsman@cancer.rah.sa.gov.au Royal Adelaide Hospital Ph 08 8222 4188 Fx 08 8222 5937 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Modulator problems Message-ID: <00BE56E17E26D11197CB00805FA6803A010CAB1A@mail.midcentral.co.nz> From: Keith Croft To: 'Paul Twyman' Cc: 'LinacEng' Subject: RE: Modulator problems Date: Wed, 18 Aug 1999 13:18:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have never been on a service course for a 600C or otherwise, but on = the Service course for the 2100C mention was made of shaping the modulator = pulse by altering the position of the taps from the PFN capacitor to the = coil. Sounds like the first capacitor has it tap position too near the end of = the coil - hence little inductance to limit the current. Keith Palmerston North New Zealand. -----Original Message----- From: Paul Twyman [mailto:mawm82@[158.43.128.67]] Sent: Wednesday, August 18, 1999 11:50 PM To: linac-eng@plato1.aristotle.net Subject: Modulator problems Hello to all fellow subscribers I have a long standing problem on a Clinac 600 CD ser no 505. When the machine was installed it was noted that there were=20 horizontal lines on the PV images. It was not possible to calibrate=20 them out and they were not in the same place on consecutive=20 aquisitions. The installation engineer also had problems with=20 FLOW,ACC and COLL interlocks randomly appearing and shutting beam=20 off. the cure for the FLOW fault was to disconnect the flow read out=20 display on the gantry. The problem was said to be RF noise. Subsequent to installation we have continued having these problems=20 and have noted that the Mag I pulse is not normal. The leading edge=20 reaches a max of approx. 170amps for 0.2 micro secs before it reduces=20 to the normal 105 amps as for this type of Magnetron.The machine is=20 less than two years old and has recenctly eaten our first=20 magnetron. An EEV report suggests that the failure was due to the Mag=20 I pulse and that this in turn is a Modulator problem. Something to do=20 with anode emmission sites having been created within the Magnetron.=20 When EEV tried to run the deceased Magnetron it wouldn't. Apparently the new 600CD's coming out of the factory have a=20 modification to prevent the Magnetron, and the gun I suppose, from=20 seeing the large spike.=09 My question is - Does anyone else out there suffer from this problem and if so what has been done about it by Varian?=09 We have notified Varian about this problem on many occassions (since acceptance of the machine) and we are still waiting for a=20 modification. The Modulator has now cost us =A313K due to the the early = loss of a magnetron and perhaps they could see their way clear of=20 replacing it FOC. Of course our new Magnetron is now suffering in the=20 same treatment and it would be very sad if it failed in a similar=20 manor. Yours - fairly fed up! Paul Twyman Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Modulator problems Message-ID: <199908181615.LAA23958@plato1.aristotle.net> From: Paul Twyman To: "Barnes, Bill" , linac-eng@plato1.aristotle.net Subject: RE: Modulator problems Date: Wed, 18 Aug 1999 09:12:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi again No our problem is not the PV system. It is definately a Modulator problem that seems to be peculiar to 600CD's. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Philips RT100 - drop in mA Message-ID: <457B79AC7AB2D211AAAC006097BDA653062514@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'linac-eng@plato1.aristotle.net'" Subject: RE: Philips RT100 - drop in mA Date: Wed, 18 Aug 1999 07:32:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" John, I would try to increase my filament voltage first, to see if that stabilizes the output. Barring that, the tube is showing severe signs of age. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: John Macmillan [mailto:jmac@rtphys.abel.co.uk] Sent: Wednesday, August 18, 1999 3:57 AM To: 'Linac Eng List'; 'linac-eng@plato1.aristotle.net' Subject: Philips RT100 - drop in mA Dear All Out RT100 output mA is intermittently dropping from 8 to 4 on 100KV and 10 to 6 on the rest for more than a few seconds - sometimes up to a minute. Therefore, the problem is not specific to any one energy. Before I look at the cables and tube (no longer manufactured by Philips - I believe), I am going to pull the main unit apart and look there first. Has anyone had any experience or pointers to the repair of this fault? Thanks in advance John Macmillan Royal Shrewsbury Hospital UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Commands Message-ID: <37BAB380.3F10ECFD@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" Subject: Commands Date: Wed, 18 Aug 1999 05:22:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" All: I sent this message to Paul Twyman and then decided that maybe others should know also. Paul: If you send a "help" command to "majordomo@plato.aristotle.net" you will receive a list of all the commands that you can use on the list server. Pete Vitali ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Modulator problems Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6D1E@radoncnt1.fccc.edu> From: "Barnes, Bill" To: 'Paul Twyman' , "Linac-Eng (E-mail)" Subject: RE: Modulator problems Date: Wed, 18 Aug 1999 04:41:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Paul, My experience with the Varian Portal Vision, would suggest that you = check the High Voltage supply for the detector array. It has caused me some similar problems, with lines in my images. =20 Good Luck. BILL BARNES, BSEE BIO ENGINEER RADIATION ONCOLOGY FOX CHASE CANCER CENTER PHILADELPHIA, PA. B_BARNES@FCCC.EDU =20 215-728-2997 -----Original Message----- From: Paul Twyman [mailto:mawm82@[158.43.128.67]] Sent: Wednesday, August 18, 1999 6:50 AM To: linac-eng@plato1.aristotle.net Subject: Modulator problems Hello to all fellow subscribers I have a long standing problem on a Clinac 600 CD ser no 505. When the machine was installed it was noted that there were=20 horizontal lines on the PV images. It was not possible to calibrate=20 them out and they were not in the same place on consecutive=20 aquisitions. The installation engineer also had problems with=20 FLOW,ACC and COLL interlocks randomly appearing and shutting beam=20 off. the cure for the FLOW fault was to disconnect the flow read out=20 display on the gantry. The problem was said to be RF noise. Subsequent to installation we have continued having these problems=20 and have noted that the Mag I pulse is not normal. The leading edge=20 reaches a max of approx. 170amps for 0.2 micro secs before it reduces=20 to the normal 105 amps as for this type of Magnetron.The machine is=20 less than two years old and has recenctly eaten our first=20 magnetron. An EEV report suggests that the failure was due to the Mag=20 I pulse and that this in turn is a Modulator problem. Something to do=20 with anode emmission sites having been created within the Magnetron.=20 When EEV tried to run the deceased Magnetron it wouldn't. Apparently the new 600CD's coming out of the factory have a=20 modification to prevent the Magnetron, and the gun I suppose, from=20 seeing the large spike.=09 My question is - Does anyone else out there suffer from this problem=20 and if so what has been done about it by Varian?=09 We have notified Varian about this problem on many occassions (since=20 acceptance of the machine) and we are still waiting for a=20 modification. The Modulator has now cost us =A313K due to the the early=20 loss of a magnetron and perhaps they could see their way clear of=20 replacing it FOC. Of course our new Magnetron is now suffering in the=20 same treatment and it would be very sad if it failed in a similar=20 manor. Yours - fairly fed up! Paul Twyman Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Archive Message-ID: <199908181128.GAA15701@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: Archive Date: Wed, 18 Aug 1999 04:25:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello again Who actually owns linac-eng and does it have an archive that is accessable for subscribers to view. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Modulator problems Message-ID: <199908181052.FAA15132@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: Modulator problems Date: Wed, 18 Aug 1999 03:49:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello to all fellow subscribers I have a long standing problem on a Clinac 600 CD ser no 505. When the machine was installed it was noted that there were=20 horizontal lines on the PV images. It was not possible to calibrate=20 them out and they were not in the same place on consecutive=20 aquisitions. The installation engineer also had problems with=20 FLOW,ACC and COLL interlocks randomly appearing and shutting beam=20 off. the cure for the FLOW fault was to disconnect the flow read out=20 display on the gantry. The problem was said to be RF noise. Subsequent to installation we have continued having these problems=20 and have noted that the Mag I pulse is not normal. The leading edge=20 reaches a max of approx. 170amps for 0.2 micro secs before it reduces=20 to the normal 105 amps as for this type of Magnetron.The machine is=20 less than two years old and has recenctly eaten our first=20 magnetron. An EEV report suggests that the failure was due to the Mag=20 I pulse and that this in turn is a Modulator problem. Something to do=20 with anode emmission sites having been created within the Magnetron.=20 When EEV tried to run the deceased Magnetron it wouldn't. Apparently the new 600CD's coming out of the factory have a=20 modification to prevent the Magnetron, and the gun I suppose, from=20 seeing the large spike.=09 My question is - Does anyone else out there suffer from this problem and if so what has been done about it by Varian?=09 We have notified Varian about this problem on many occassions (since acceptance of the machine) and we are still waiting for a=20 modification. The Modulator has now cost us =A313K due to the the early = loss of a magnetron and perhaps they could see their way clear of=20 replacing it FOC. Of course our new Magnetron is now suffering in the=20 same treatment and it would be very sad if it failed in a similar=20 manor. Yours - fairly fed up! Paul Twyman Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Philips RT100 - drop in mA Message-ID: <01BEE960.0A09CFE0@ppp-1-201.cvx6.telinco.net> From: John Macmillan To: 'Linac Eng List' , "'linac-eng@plato1.aristotle.net'" Subject: Philips RT100 - drop in mA Date: Wed, 18 Aug 1999 00:56:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear All Out RT100 output mA is intermittently dropping from 8 to 4 on 100KV and 10 to 6 on the rest for more than a few seconds - sometimes up to a minute. Therefore, the problem is not specific to any one energy. Before I look at the cables and tube (no longer manufactured by Philips - I believe), I am going to pull the main unit apart and look there first. Has anyone had any experience or pointers to the repair of this fault? Thanks in advance John Macmillan Royal Shrewsbury Hospital UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Picker 120 Ortho Tube needed !!! Message-ID: <93251dbc.24eb4744@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Picker 120 Ortho Tube needed !!! Date: Tue, 17 Aug 1999 15:16:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I need a replacement tube for a PICKER 120 orthovolt Unit Specs: Housing: CXB Focal spot: 3.8 Tube insert G4209 and for what its worth Picker cat # TX-2A Call 661-257-1064 if you have info. Thanks for your kind assistance. Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian Old XIM Message-ID: <457B79AC7AB2D211AAAC006097BDA653062509@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "'Rtsolution@aol.com'" , linac-eng@plato1.aristotle.net Subject: RE: Varian Old XIM Date: Mon, 16 Aug 1999 09:29:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have had similar problems once upon a time. The cure all fix was to solder all the power leads etc into the Molex connectors rather than having them crimped in. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Rtsolution@aol.com [mailto:Rtsolution@aol.com] Sent: Monday, August 16, 1999 11:59 AM To: linac-eng@plato1.aristotle.net Subject: Varian Old XIM We have an old Xim with micro-X (about 12 year old) here and giving me trouble. Trouble is at the console key board. When power ON, the console light flashing even all the joysticks are ok. The console 5V is ok. The computer monitor display " Error of reading from port rack 2 ". Has anybody come across this Thanks in advance St Barts engineers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Medical-120leaf MLC Message-ID: <457B79AC7AB2D211AAAC006097BDA653062507@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: Varian Medical-120leaf MLC Date: Mon, 16 Aug 1999 09:10:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To those who may have interest and desire info. Pictures....technical info etc is available for Varian Medical Systems new Millenium 120 MLC. We have had one installed since March timeline in beta test...now a real product! Email direct for picture. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Old XIM Message-ID: From: Rtsolution@aol.com To: linac-eng@plato1.aristotle.net Subject: Varian Old XIM Date: Mon, 16 Aug 1999 08:59:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have an old Xim with micro-X (about 12 year old) here and giving me trouble. Trouble is at the console key board. When power ON, the console light flashing even all the joysticks are ok. The console 5V is ok. The computer monitor display " Error of reading from port rack 2 ". Has anybody come across this Thanks in advance St Barts engineers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Portal Vision Balancing Message-ID: <37B40D73.3CD8324B@hsc.vcu.edu> From: Chris Bartee To: Linac List Server Subject: Portal Vision Balancing Date: Fri, 13 Aug 1999 04:20:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, I installed several R-arms while employed with Varian. There are various ways to balance the gantry. The reason the R-arm side is left heavy is because the gantry should not drift when the R-arm is extended to around 120. The balance changes from extended to retracted positions, so the installer needs to play with the balance to find the best spot. I do not recommend tightening the auto clutch because this can cause other problems, especially in low energy machines. Just two cents, Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: KD spare parts Message-ID: <9908129344.AA934464019@generalhealth.org> From: Kevin_Martin@generalhealth.org To: linac-eng@plato1.aristotle.net Subject: KD spare parts Date: Thu, 12 Aug 1999 05:18:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Any one need spare parts for Siemens KD's. Here's a list please give me a call / email if interested have a good day! Kevin Martin@225-387-7273 Siemens Parts Poly-Spede pcb. Assy with manual PRD2-50 option: S1-1 s/n4390 2- Target Drive assy part# 8496440B Power Supplies- DCR 40-40B2 + DCR 40-13B2 Model 460 Power Osc. 2980.3020Mhz@ 350watts KD upper defining head repair kit with 12, 8 & 3" microslides Electron Dose Chamber part# 8487472 Regulator Injector part# 8313850 40+ H.V. diodes CDB7.5's Interlock Panel part#5677422 Misc. Pcb's- Head driver, 24v Servo, Water Flow, Calculator Hand Control switch assy part# 8486524 2- Filament Transformers IRG 954 part#5648779 Cross Hair Reticule Other misc. Powerstat Variable Trans., misc. CB's, Gantry clutch's, Waveguide flanges, Thyratron Socket These parts are either new or spare parts that have removed and tested OK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: 2100C Carrousel Controller Message-ID: From: Randy Wick To: 'Linac-eng list' Subject: FW: 2100C Carrousel Controller Date: Wed, 11 Aug 1999 10:42:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" FYI, we finally did find the IC for the PS OK signal on the auxillary backplane. U3 shown on the system diagram, does not appear on the backplane schematic but IS shown on the PCB layout drawing. Once we replaced the optocoupler, we didn't get any more CARR/FOIL i/locks. Why it always happened only in 9e, I'll never know. Note: On the schematic for the Aux. backplane, it shows an ILQ2 monitoring the +/- 27 and +/- 16 volts. This is U1 and would yield an STPS i/lock. -----Original Message----- From: Randy Wick [mailto:rwick@bccancer.bc.ca] Sent: Wednesday, July 28, 1999 8:29 AM To: 'Linac-eng list' Subject: 2100C Carrousel Controller We have had a nagging problem with our 2100C s/n 265 (C2 machine). It often gets a CARR/FOIL i/lock, almost exclusively with 9e, that can be very difficult to clear. The indicated hex error code is "OC" which is a power supply fault. However, the power supplies are good (scoped them for AC ripple, etc.) We swapped out the Carr. Controller and Interface PCB's to no effect, and also the optocoupler IC that we THOUGHT gave the "power supply OK" signal to the Interface board. In all of this we were relying on the system drawing for the CARR i/l in the manual. ------ My question is: does anybody know where the PS OK signal, on pin 22 of the Carrousel Interface card, comes from? We will have to pull out the Auxillary backplane to trace the signal and I definitely don't want to do that. ------------------------------------ Randy Wick Radiotherapy Service Vancouver Clinic British Columbia Cancer Agency Vancouver BC Canada rwick@bccancer.bc.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: High Voltage Chip Varian Portvision Message-ID: <37B0A185.52B7095F@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" Subject: High Voltage Chip Varian Portvision Date: Tue, 10 Aug 1999 14:04:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" "Peter E. Vitali" wrote: > Hskang: To make sure we are looking at the same chip, in my portal > vision book I find them on drawing no: VABA 300 17 Board MBC/MBH. > There are 4 of them. They are listed as HVO3. > They are made by Supertex Inc. It is a 64 Channel Serial to Parallel > Converter with Open Drain Outputs. They come in 5 configurations. In > 1994 Supetex Inc was located at 1225 Bordeaux Drive, Sunnyvale, > California USA 94088. At that time their phone was 408-744-0100. I > assume that you are in Korea. The distributor in Korea in 1994 was > Jingusa Ltd, Seoul Korea, 82-02-244-7492. I got this information from > the 1994 IC Master. It is a publication of the Hearst Business > Publishing . > They are also on the World Wide Web at "icmaster.com". Hope this > helps > > Pete Vitali ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@cancerboard.ab.ca To: Carl Murphy Cc: linac-eng@plato1.aristotle.net, tcullen@wfubmc.edu Subject: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Date: Tue, 10 Aug 1999 09:15:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl et al; I think that there have been some previous postings about the high voltage mutiplexer ICs part number HV0330PG. I purchased some in the past from the manufacturer, Supertex Inc. Tel. 1-800-487-8737. These ICs are soldered onto a header, Varian p/n B400361P1 and thereby become a MBHS B400281R01. At one time Supertex was on the internet at www.supertex.com Regards. On Tue, 10 Aug 1999 12:21:21 -0300 Carl Murphy wrote: > Hi All: > > Wondering if anyone has found out about those High Voltage switches on the Portal Vision. I think I may have some that are defective. The cost of the board is over $7000 US. I'd rather not spend that kind of coin. Anyhow, if someone has a source, please let me know! > > Thanks, > > Carl Murphy > Electronics Engineering Technologist > Nova Scotia Cancer Centre > QEII Health Sciences Centre > Halifax, Nova Scotia, Canada > Phone: (902) 473-6152 > Fax:(902) 473-6120 > Email: ccchm@qe2-hsc.ns.ca > ! ! ! > ! > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net, tcullen@wfubmc.edu Subject: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Date: Tue, 10 Aug 1999 07:21:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All: Wondering if anyone has found out about those High Voltage switches on the Portal Vision. I think I may have some that are defective. The cost of the board is over $7000 US. I'd rather not spend that kind of coin. Anyhow, if someone has a source, please let me know! Thanks, Carl Murphy Electronics Engineering Technologist Nova Scotia Cancer Centre QEII Health Sciences Centre Halifax, Nova Scotia, Canada Phone: (902) 473-6152 Fax:(902) 473-6120 Email: ccchm@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fw: Dell locking up. Message-ID: <000901bee323$d48b1dc0$082b187e@arg> From: Arlie To: linac-eng@plato1.aristotle.net Subject: Fw: Dell locking up. Date: Tue, 10 Aug 1999 03:31:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ----- Original Message ----- From: Arlie To: Eilert.Viking@lio.se Sent: Tuesday, August 10, 1999 6:22 AM Subject: Dell locking up. Eilert, We are having the same problem with one of our 2100C's. We are running 5.2 so it is probably not the software.We performed the first step of the upgrade ourselves, which involved changing the PC's and making them run with current revision.No problems for 6 weeks until last Friday. We are experiencing the same exact symptoms on the 2100. I, going to swap out the dell GX1 and see if the problem disappears. Arlie Grills BJC Health Systems Barnes Hospital St. Louis Mo. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Elekta SL25 dose temp2 Message-ID: <4.1.19990809154338.00946c20@radonc17.ucsf.edu> From: John Somers To: "S." , linac digest Subject: Re: Elekta SL25 dose temp2 Date: Mon, 9 Aug 1999 11:55:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 10:40 PM 8/6/99 +0100, S. wrote: >Hello all, > >We have just had a curious problem on or SL25. The machine inhibited and >went closed-state on dose temp2 (426). Part 4 value of item 426 was -35.17 >whereas part 4 of item 424 dose temp 1 was +27.30. We shut down and >re-booted the machine twice, changed the action mask for the part to >'ignore' and reset several times to no avail. >We checked the +15v supply out of the SCC card and found it to be OK. We >then checked the input from the SCC to the AI12 card and found it to be >either 0.7 or 8 volts depending on how you count the 11th pin on a D-plug >connector! Has anybody else had this problem? We suspected a faulty >thermistor on the ion chamber leg but curiously enough after a few hours the >problem miraculously disappeared! >Sean Murphy >Senior MTO >RSH Hospital >Southampton UK Changing the action mask is not saved on many dose-critical and calibration-critical items. This is intentional by Philips/Elekta You might try lightly heating both thermistors with some warm air from a heat gun or lightly cooling them with some freeze spray and checking the two items 424 and 426 to see if they track together. This may indicate whether the thermistor is bad. And if you get that far into the head, you probably might as well just replace the thermistor and be done with it. Good luck! John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: communication error Clinac 2100C Message-ID: <37AF43F4.496C92F2@wfubmc.edu> From: tcullen@wfubmc.edu To: Viking Eilert Cc: "Linac-Eng (E-post)" Subject: Re: communication error Clinac 2100C Date: Mon, 9 Aug 1999 13:11:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Viking,=20 take a look at the CNF files to see if they all updated during the = install. I would also check the cable from the Comm to the PC. It would seem if = this had a bad wire it would be bad all the time, or you could flex it to = make your problem appear, but it is still worth checking.=20 I have had weird problems with the Dells, but the problems have almost always been immediate or within a short time after installation. Bad = out of the box you might say. The Dell is what I would suspect the most. = Easily confirmed by having Varian send another in.=20 Good Luck=20 =20 _____ =20 Viking Eilert wrote:=20 Hello linac list.=20 We have a Clinac 2100C #248. It was upgraded to version 5,4 and at the = same=20 time Varian replaced the IBM PC to a pentium Dell optiplex. Ever since = we=20 have had communication error which locks the Dell PC approximately once = a=20 day (some times maybe five times a day and outer times maybe not for a=20 couple of days). We havn't noticed any particular times when the error=20 occour. Rather often it happens during the nights when the machine is = in=20 standby.=20 The only way to solve the problem is to reset the STD bus (or shutting = the=20 machine off and on), then it works fine for a while.=20 Our local Varian office doesn't know what causes the problem. First = they=20 asked us to replace the communication and controller microprocessor PCB = to=20 a vendor revision number 17 or above. We replaced them but it didn't = help.=20 Could it be the Dell PC or the security module on the printer port of = the=20 PC?=20 We have know replaced all the PCB (beside the ADC, which we will = replace) in the STD bus without any luck.=20 Have anyone of you out there on the list heard of a simular problem or = have=20 any suggestions?=20 Symptoms:=20 1. The LED on the control microprocessor PCB always shows 01 hex, = digital=20 output read back failure.=20 2. The LED on the communication microprocessor PCB is ok (FF hex).=20 3. No info is stored in the Event log file.=20 4. If you reboot the Dell PC (when you have the comm error) it = sometimes=20 shows on the screen:=20 Installed versions 5,4,05 console software 1102194-10, comm software=20 01x*+0=A7/&=3D?...... (or some other rubbish characters), incorrect = comm=20 firmware installed, incorrect controller firmware installed.=20 or=20 Communication failed reading firmware version - data 24 (or data 26)=20 5. No communication is possible from the machine to the Dell PC. We = have=20 tried to look in service mode at the hex codes in = the=20 common RAM, but I don't know if it have any relevant information = because of=20 the lack of proper communication. The hex codes for = =20 shows F1 or FD (should be 01 ?) and the shows F1 = or=20 FF.=20 Thank you=20 Eilert Viking=20 Universitetssjukhuset i Link=F6ping Eilert Viking=20 O-centrum telefon: +46-13 222805=20 Radiofysikavdelningen fax: +46-13 222895=20 Sjukhusfysik Eilert.Viking@lio.se=20 S-581 85 Link=F6ping=20 Sweden=20 telefon: +46-13 222000 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Service Reports and Repair Tracking Message-ID: <99Aug9.141352edt.115589@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: linac-eng@plato1.aristotle.net Subject: RE: Service Reports and Repair Tracking Date: Mon, 9 Aug 1999 10:04:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For those of you who are interested, the demo of our service-tracking software is available at http://www.geocities.com/SoHo/Lofts/1053/Accel/Accel.htm Regards, Tom Feuerstake PMH Toronto ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: database ID Message-ID: <005201bee0ed$6a1fea20$26ead1ab@pwserver> From: Steve Schwarz To: "Wilson, Jim" Cc: clafoone@acceletronics.com Subject: database ID Date: Sat, 7 Aug 1999 07:48:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Jim, You ID is: james and your password is vincent Thank you for your interest and please let me know if you have any problems logging on. We look forward to working with you! Regards, Steve Schwarz, sschwarz@acceletronics.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Elekta SL25 dose temp2 Message-ID: <004901bee054$74f8f520$440150c3@default> From: "S." To: linac digest Subject: Elekta SL25 dose temp2 Date: Fri, 6 Aug 1999 13:40:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, We have just had a curious problem on or SL25. The machine inhibited and went closed-state on dose temp2 (426). Part 4 value of item 426 was -35.17 whereas part 4 of item 424 dose temp 1 was +27.30. We shut down and re-booted the machine twice, changed the action mask for the part to 'ignore' and reset several times to no avail. We checked the +15v supply out of the SCC card and found it to be OK. We then checked the input from the SCC to the AI12 card and found it to be either 0.7 or 8 volts depending on how you count the 11th pin on a D-plug connector! Has anybody else had this problem? We suspected a faulty thermistor on the ion chamber leg but curiously enough after a few hours the problem miraculously disappeared! On a slightly different note, has anybody recently had a quality problem with Elekta supplied target assemblies for the SL75 series machines? We have had three in three months on the same machine, the last one lasting two weeks! Water flow around the machine was tested and found to be OK so there is no overheating. The raw beam has also been checked with a Schuster diode array and found to be centrally placed. Thanks in advance for any suggestions. Sean Murphy Senior MTO RSH Hospital Southampton UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Message-ID: <37AB531E.C254A32@wfubmc.edu> From: tcullen@wfubmc.edu To: 'Linac-eng list' Subject: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Date: Fri, 6 Aug 1999 13:26:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy, Unfortunately the in-house people are not the only ones effected by no info, functional, and schematic drawings. The vendors own people are now showing the results/frustration of not having enough information/training to repair their own companies' equipment. The one thing I hoped the vendors would keep in mind is that these units treat patients, and if they make them more difficult to service, repair, and procure parts for, it is the patients that suffer, not us. The trend for hospitals to hire in-house people was/is for more than the bottom line. It was the fact that machine problems impact the patient's treatment schedule and we're here to minimize that. It would be nice to say that the vendors are helping us to do this instead of impeding the flow. add-on..... Tim Waldron, or whoever attended: I am curious about the results of the meeting in Nashville concerning our becoming a sub-group under the AAPM. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Message-ID: <862567C5.0068459B.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: RE: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Date: Fri, 6 Aug 1999 10:49:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy, your feelings are shared by many. Basically, what has happened ove the last 6 years or so is that the vendors' corporate view of parts/service has evolved from that of a cost center that is necessary to sell equipment to that of service/parts as a profit center. Now that parts and service have a profit margin, us in-house folks have gone from allies to compettion, and anything they can do to keep us out translates to profit. I think that this will ultimately cost Varian their market leadership, but they're not alone. Siemens' latest and greatest Primus product has a "sealed" modulator with a long warranty, and is not considered field-repairable. They supposedly replace the whole modulator as a unit. No, the days of the vendor/in-house partnership are over. You and I are every bit as much competition to Varian or Siemens as the other vendors are, and thats all there is to it, at least at the corporate and strategic level. Recognizing this is not an answer, unfortunately. Tim Waldron ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Message-ID: From: Randy Wick To: 'Linac-eng list' Subject: RE: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Date: Fri, 6 Aug 1999 08:41:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" If you are able to find a source, let us all know. We were able to repair the cassette for one of our two PV's some time ago by replacing a HV switch, but another has failed and we are now unable to get parts and are told we must upgrade to a new cassette at great expense. I have been getting more and more frustrated with our Varian equipment. What was once a high quality, field repairable machine seems to be becoming less so. It is one thing to stop support of a product 10 or 15 years after its introduction, but less than 5 years?!! On the 2100EX there are a few more items that have arrived that do not come with schematics or other information and so are virtually unrepairable in the field. So far, the list includes the accessory controller PCB and the gantry display computer in addition to the PV - I'm sure we'll find more as we go along. In both cases (the acc. cont. and display comp.) the data book has "schematics" but they are for the old devices. And while we're at it, where are the functional diagrams for the C3 machines, as well as the EX (which should probably be considered a C4)? For the moment, this is a relatively minor problem, but is this the direction that Varian wants to go? Varian will greatly reduce its market if they only want to sell machines to customers who are satisfied purchasing a device which can only be serviced by Varian for the ENTIRE life of the machine. To be more specific, what this means is that the day may come when any clinic with in-house or third party service will have to be dragged kicking and screaming into accepting a new Varian. Sorry, just my rant for the day! -----Original Message----- From: hskang1@samsung.co.kr [mailto:hskang1@samsung.co.kr] Sent: Thursday, August 05, 1999 11:30 PM To: linac-eng@plato1.aristotle.net Subject: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 My equipment is varian portal vision mk1 and swing arm.Software version is 3.5.I can't buy high voltage switch of portal vision because there is no more order number in varian.If you have high voltage switch and don't need that, please send mail to me. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Service Reports and Repair Tracking Message-ID: <457B79AC7AB2D211AAAC006097BDA6530624F7@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: linac-eng@plato1.aristotle.net Subject: RE: Service Reports and Repair Tracking Date: Fri, 6 Aug 1999 07:19:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I too purchased PMC2000 from DP Solutions. I have not been very satisfied with the product and can honestly say that their tech support sucks. I would suggest an alternative program to anything from DP Solutions. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Jim Beaty [mailto:jimbeaty@aristotle.net] Sent: Thursday, August 05, 1999 10:19 PM To: linac-eng@plato1.aristotle.net Subject: Re: Service Reports and Repair Tracking I went through this same search about 2 years ago. After evaluating numerous programs, I purchased PMC for Windows by DP Solutions. It is built on Microsoft Access, and is a very versatile product. The package includes modules for PM scheduling, work requests, inventory management, and purchase orders. You can use as many of the features as you need, ignoring those you don't. It is fairly easy to customize, and because it's built on a Microsoft product, it's pretty easy to import data into. Customizing reports is a bit tricky, and tech support is only average, but overall I'm pretty satisfied with it. Jim Beaty Chief Engineer CARTI, Inc. jbeaty@carti.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Message-ID: <37AAD1BD.B98101@yale.edu> From: "Peter E. Vitali" To: hskang1@samsung.co.kr Cc: linac-eng@plato1.aristotle.net Subject: Re: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Date: Fri, 6 Aug 1999 04:15:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Hskang: To make sure we are looking at the same chip, in my portal vision book I find them on drawing no: VABA 300 17 Board MBC/MBH. There are 4 of them. They are listed as HVO3. They are made by Supertex Inc. It is a 64 Channel Serial to Parallel Converter with Open Drain Outputs. They come in 5 configurations. In 1994 Supetex Inc was located at 1225 Bordeaux Drive, Sunnyvale, California USA 94088. At that time their phone was 408-744-0100. I assume that you are in Korea. The distributor in Korea in 1994 was Jingusa Ltd, Seoul Korea, 82-02-244-7492. I got this information from the 1994 IC Master. It is a publication of the Hearst Business Publishing . They are also on the World Wide Web at "icmaster.com". Hope this helps Pete Vitali ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: MLC Computer Hard Disk Failure Message-ID: <37AACA8C.D3FBDC71@yale.edu> From: "Peter E. Vitali" To: Oktay Ureten Cc: linac-eng@plato1.aristotle.net Subject: Re: MLC Computer Hard Disk Failure Date: Fri, 6 Aug 1999 03:44:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Oktay: Sounds like you may have a defective memory battery. Are your time and date correct. If not replace the battery. ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: communication error Clinac 2100C Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB43B@liosex1.lio.se> From: Viking Eilert To: "Linac-Eng (E-post)" Cc: "Torben Larsen (E-post)" , "Tommie Jeppesen (E-post)" , "Tom Robins (E-post)" , "William Kirkness (E-post)" Subject: communication error Clinac 2100C Date: Fri, 6 Aug 1999 01:06:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello linac list. We have a Clinac 2100C #248. It was upgraded to version 5,4 and at the = same time Varian replaced the IBM PC to a pentium Dell optiplex. Ever since = we have had communication error which locks the Dell PC approximately once = a day (some times maybe five times a day and outer times maybe not for a couple of days). We havn't noticed any particular times when the error occour. Rather often it happens during the nights when the machine is = in standby. The only way to solve the problem is to reset the STD bus (or shutting = the machine off and on), then it works fine for a while. Our local Varian office doesn't know what causes the problem. First = they asked us to replace the communication and controller microprocessor PCB = to a vendor revision number 17 or above. We replaced them but it didn't = help. Could it be the Dell PC or the security module on the printer port of = the PC? We have know replaced all the PCB (beside the ADC, which we will = replace) in the STD bus without any luck. Have anyone of you out there on the list heard of a simular problem or = have any suggestions? Symptoms: 1. The LED on the control microprocessor PCB always shows 01 hex, = digital output read back failure. 2. The LED on the communication microprocessor PCB is ok (FF hex). 3. No info is stored in the Event log file. 4. If you reboot the Dell PC (when you have the comm error) it = sometimes shows on the screen: Installed versions 5,4,05 console software 1102194-10, comm software 01x*+0=A7/&=3D?...... (or some other rubbish characters), incorrect = comm firmware installed, incorrect controller firmware installed. or Communication failed reading firmware version - data 24 (or data 26) 5. No communication is possible from the machine to the Dell PC. We = have tried to look in service mode at the hex codes in = the common RAM, but I don't know if it have any relevant information = because of the lack of proper communication. The hex codes for = shows F1 or FD (should be 01 ?) and the shows F1 = or FF. Thank you=20 Eilert Viking Universitetssjukhuset i Link=F6ping Eilert Viking O-centrum telefon: +46-13 222805 Radiofysikavdelningen fax: +46-13 222895 Sjukhusfysik Eilert.Viking@lio.se S-581 85 Link=F6ping Sweden telefon: +46-13 222000 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Message-ID: From: hskang1@samsung.co.kr To: linac-eng@plato1.aristotle.net Subject: 4 HIGH VOLTAGE SWITCH CHIPS OF VARIAN PORTAL VISION MK1 Date: Thu, 5 Aug 1999 22:29:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My equipment is varian portal vision mk1 and swing arm.Software version is 3.5. I can't buy high voltage switch of portal vision because there is no more order number in varian. If you have high voltage switch and don't need that, please send mail to me. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: acceletronics.com online parts database Message-ID: <001801bedfbf$5d4e1b20$e91da798@ypoxkjlg> From: Steve Schwarz To: linac-eng@PLATO1.ARISTOTLE.NET Subject: acceletronics.com online parts database Date: Thu, 5 Aug 1999 19:53:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all responsible for the maintenance of radiotherapy equipment: Acceletronics.com now has an online parts database that you can use to research and purchase replacement parts online. In order to use the online database, you will need an updated browser that accepts cookies, java scrolling and SSL security. Our goal is to provide you with the best services available and we hope that by making our database of parts available for your use it will make your parts research tasks easier and that you will give us the opportunity to provide you with the parts services you need. With regards to pricing, our guarantee to you is that we will meet or beat any other linac part distributors price on any item we have in stock as long as it is not below our cost. Please call us at 800-626-8704 or email us for your personal login ID and password to access our online parts database. Thank You & My Regards, Steve Schwarz sschwarz@acceletronics.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Service Reports and Repair Tracking Message-ID: <37AA540F.740EDF67@aristotle.net> From: Jim Beaty To: linac-eng@plato1.aristotle.net Subject: Re: Service Reports and Repair Tracking Date: Thu, 5 Aug 1999 19:18:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I went through this same search about 2 years ago. After evaluating numerous programs, I purchased PMC for Windows by DP Solutions. It is built on Microsoft Access, and is a very versatile product. The package includes modules for PM scheduling, work requests, inventory management, and purchase orders. You can use as many of the features as you need, ignoring those you don't. It is fairly easy to customize, and because it's built on a Microsoft product, it's pretty easy to import data into. Customizing reports is a bit tricky, and tech support is only average, but overall I'm pretty satisfied with it. Jim Beaty Chief Engineer CARTI, Inc. jbeaty@carti.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Service Reports and Repair Tracking Message-ID: From: Ralph Pongracz Reply-To: ralphp@CancerBoard.ab.ca To: PJShoop@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Service Reports and Repair Tracking Date: Thu, 5 Aug 1999 14:02:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have been using HECS 3.1 from ECRI for the past number of years; not Y2K compliant and no longer supported. We have just replaced it with a maintenance management software package called AMMS (Advanced maintenance management system)from Microwest out of San Diego Calif. We evaluated eight vendor products before settling on this one. We feel it has the following strengths that are well beyond the other products we examined: a)User friendliness - Well laid out main page, easily understood screens, windows based b)User Customization - Very Strong, can configure you database the way you want (Screen layouts, field naming, added fields, etc.) c)Fast Response on network with multi users d)Efficient filtering and reporting e)Embedded help files f)Installs like a breeze f)Excellent support network As the package is a full blown package it might be too pricey for smaller centers, but certainly should be evaluated by larger centers. A final note, the May/June 1998 issue of the 'Journal of Clinical Engineering' has a good article that reviews various CMMS packages. Ralph Ralph Pongracz Manger - TMG Medical Physics Cross Cancer Institute Edmonton, Alberta On Tue, 3 Aug 1999 08:23:03 EDT PJShoop@aol.com wrote: > Good morning, > > I would like to know what software you guys use for service > reports and maint for tracking your repairs. > > My Physicist wants me to start using Microsoft Access for > all work orders and service reports. Anyone out there use > Access? If so, would you be willing to share the > template(s)? > > Thanks > > Phil Shoop > Maryland Regional Cancer Care ---------------------- Ralph Pongracz ralphp@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Portalvision balancing Message-ID: <457B79AC7AB2D211AAAC006097BDA6530624F6@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'James Balter' , linac-eng@plato1.aristotle.net Subject: RE: Portalvision balancing Date: Thu, 5 Aug 1999 13:44:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We just went over this recently. Yes, look for 3 steel plates located beneath the R-Arm in the middle of the unit. You will have to remove the covers to see them unfortunately. Remove this plates accordingly to your balance requirements. Richard Kimball Senior Engineer Dept of Radiation & Cellular Oncology Univ. of Chicago Hospitals 773.702.6879 -----Original Message----- From: James Balter [mailto:jbalter@umich.edu] Sent: Thursday, August 05, 1999 9:13 AM To: linac-eng@plato1.aristotle.net Subject: Portalvision balancing Hi! We have a 2100CD with a portalvision imager and robot arm. After Varian installation, it appears that the gantry is out of balance, with the imager side being too heavy. Are there additional weights to remove from the bottom, or do we have to add weight to the top? Any help would be greatly appreciated. Sincerely, James Balter University of Michigan jbalter@umich.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: MLC Computer Hard Disk Failure Message-ID: From: Oktay Ureten Reply-To: Oktay Ureten To: Randy Wick Cc: linac-eng@plato1.aristotle.net Subject: RE: MLC Computer Hard Disk Failure Date: Thu, 5 Aug 1999 15:12:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" By the way, MLC is from Varian running under Dell486 PC. The operating system is DOS ver 6.22 I received some suggestions about initializing the boot sector. May be fdisk /mbr . Haven't tried it yet.. > What linac are you referring to? Elekta or Varian, type of computer system, > etc. (Please post your reply to the list) > > -----Original Message----- > From: Oktay Ureten [mailto:Oktay.Ureten@science.ankara.edu.tr] > Sent: Thursday, August 05, 1999 2:33 PM > To: linac-eng@plato1.aristotle.net > Subject: MLC Computer Hard Disk Failure > > > > Hi all, > > Yesterday, I had a boot failure in my MLC computer. I though the hard > disk was damaged. But, once I boot the computer from the floppy, I can run > any program on the hard disk. I checked the hard disk for any possible > error, but it has passed all the diagnostics. Does this happened to > anybody else? > > Oktay Ureten > Ankara University > Electronics Engineering Dept. > 06100 Tandogan Ankara Turkey > > Tel : 90-312-212 67 20 /1160 > Fax : 90-312-223 23 95 > e-mail : ureten@ieee.org > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Portalvision balancing Message-ID: From: James Balter To: linac-eng@plato1.aristotle.net Subject: Portalvision balancing Date: Thu, 5 Aug 1999 06:12:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi! We have a 2100CD with a portalvision imager and robot arm. After Varian installation, it appears that the gantry is out of balance, with the imager side being too heavy. Are there additional weights to remove from the bottom, or do we have to add weight to the top? Any help would be greatly appreciated. Sincerely, James Balter University of Michigan jbalter@umich.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Service Reports and Repair Tracking Message-ID: <862567C4.00559A9F.00@HEIAISAS08.aurora.org> From: Dale Dornacker To: Dale Dornacker Cc: PJShoop@aol.com, linac-eng@plato1.aristotle.net Subject: Re: Service Reports and Repair Tracking Date: Thu, 5 Aug 1999 07:36:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Correct spelling is St. Croix. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Question about Oldelft/Nucletron Simulix MC simulator Message-ID: <000101bedf50$6d8d3120$1d7abcbc@pc2680> From: chris To: medphys , ukphys , linac-eng Subject: Question about Oldelft/Nucletron Simulix MC simulator Date: Thu, 5 Aug 1999 06:39:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In Newcastle at the Northern Centre for Cancer Treatment radiotherapy simulation is carried out on two Nucletron/Oldelft simulix MC simulators. The accuracy of the couch isocentric rotation has been compromised on both units as a consequence of the couch support rail moving out of level. I would welcome comments from anybody that has experienced similar problems. Chris Walker Principal Physicist Regional Medical Physics Dept Newcastle General Hospital UK NE4 6BE tel:0191 273 8811 x-23143 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: MLC Computer Hard Disk Failure Message-ID: From: Oktay Ureten Reply-To: Oktay Ureten To: linac-eng@plato1.aristotle.net Subject: MLC Computer Hard Disk Failure Date: Thu, 5 Aug 1999 13:32:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, Yesterday, I had a boot failure in my MLC computer. I though the hard disk was damaged. But, once I boot the computer from the floppy, I can run any program on the hard disk. I checked the hard disk for any possible error, but it has passed all the diagnostics. Does this happened to anybody else? Oktay Ureten Ankara University Electronics Engineering Dept. 06100 Tandogan Ankara Turkey Tel : 90-312-212 67 20 /1160 Fax : 90-312-223 23 95 e-mail : ureten@ieee.org ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Service Reports and Repair Tracking Message-ID: <862567C4.004B2019.00@HEIAISAS08.aurora.org> From: Dale Dornacker To: PJShoop@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Service Reports and Repair Tracking Date: Thu, 5 Aug 1999 05:48:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We use a program called WOSYST from St. Criox Systems, Inc. This program is used to track all of our Medical Imaging equipment and Biomedical equipment in our facilities. Our Clinical Engineering department also uses it to track people. Dale Dornacker St. Lukes Medical Center, PJShoop@aol.com on 08/03/99 07:23:03 AM To: linac-eng@plato1.aristotle.net cc: (bcc: Dale Dornacker/SLM/AHC) Subject: Service Reports and Repair Tracking Note: Some recipients have been dropped due to syntax errors. Please refer to the "$AdditionalHeaders" item for the complete headers. Good morning, I would like to know what software you guys use for service reports and maint for tracking your repairs. My Physicist wants me to start using Microsoft Access for all work orders and service reports. Anyone out there use Access? If so, would you be willing to share the template(s)? Thanks Phil Shoop Maryland Regional Cancer Care ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re: ENSW Faults Message-ID: <000e01bedec9$08c87420$21a199d1@default> From: "Jeffrey L. Cressman" To: linac-eng Subject: re: ENSW Faults Date: Wed, 4 Aug 1999 14:31:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" First off I agree most of the time the air solenoids are at fault. Make sure exhaust air is not continuously leaking from one of them. Another cause could be the air line is getting pinched in the gantry windup during rotation. Watch the pressure gage on the regulator in the gantry by the air solenoids ). It is normally set at 25psi. If you are satisfied these conditions are OK, then you could adjust the Energy Switch Air Regulator up to 30psi. This will help to overcome an ENSW that is a little "sticky". Also check that you have OIL in the oiler located in the stand. Accelerator vacuum or the GUN are not the cause of the ENSW fault. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Energy s/w fault Message-ID: From: "Nelson, Steve" To: "'Peter E. Vitali'" , hskang1@samsung.co.kr Cc: linac-eng@plato1.aristotle.net Subject: RE: Energy s/w fault Date: Wed, 4 Aug 1999 05:37:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would certainly try replacing the solenoid valve before even thinking about the energy switch. Light lubrication of the shaft of the energy switch may also help somewhat. regards, Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 843-792-3271 nelson@radonc.musc.edu > -----Original Message----- > From: Peter E. Vitali [SMTP:peter.vitali@yale.edu] > Sent: Wednesday, August 04, 1999 8:06 AM > To: hskang1@samsung.co.kr > Cc: linac-eng@plato1.aristotle.net > Subject: Re: Energy s/w fault > > Taejong: I believe that you may have a defective air solenoid valve. > I do not know which manufacture's valve is installed in your machine but > if it is made by Humphrey and it has never been replaced it is probably > defective. They last about one to two years and then start leaking. << > File: Card for Peter E. Vitali >> ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Energy s/w fault Message-ID: <37A82CA3.F0618DF0@yale.edu> From: "Peter E. Vitali" To: hskang1@samsung.co.kr Cc: linac-eng@plato1.aristotle.net Subject: Re: Energy s/w fault Date: Wed, 4 Aug 1999 04:05:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Taejong: I believe that you may have a defective air solenoid valve. I do not know which manufacture's valve is installed in your machine but if it is made by Humphrey and it has never been replaced it is probably defective. They last about one to two years and then start leaking. ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Energy s/w fault Message-ID: From: hskang1@samsung.co.kr To: linac-eng@plato1.aristotle.net Subject: Energy s/w fault Date: Tue, 3 Aug 1999 16:41:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is Samsung medical center in seoul, Korea. We have CL2100C (s/n :612) linear accelerator This machain occurs ENSW fault. This problem occurs due to the incomplete withdrowal of Energy switch when select 10X. We checked following; 1. Air system : air pressure, air cylinder, micro switch --- ok 2. Accelerator Vacuum ( 10x selected) : beam off : 10 uA, beam on : 20 uA 3. Energy switch relation of Gantry angle. Energy switch seems to move normally when we move Gantry form 330 to 180 via 90 (IEC scale) However, it seems to have some difficalties (its movement bothered by something) when we move Gantry form 330 to 180 via 270(IEC scale). We would like to be informed of the following; 1. Interior structure of Energy switch. 2. The relationship between the Gantry angle and the motion of Energy switch. 3. If the energy switch is the problem, then the energy switch only need to be replaced, or vacion pump also need to be replaced. How about the Gun. please advise us. Taejong Kim / Samsung medical center. medical engineering Dept. Heesuk Kang / Samsung medical center. medical engineering Dept. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Service Reports and Repair Tracking Message-ID: From: Robert Wood To: PJShoop@aol.com, linac-eng@plato1.aristotle.net Subject: Re: Service Reports and Repair Tracking Date: Tue, 3 Aug 1999 12:45:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" If someone replys to you would you please forward any information that they don't send on the list. Thanks Woody ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Service Reports and Repair Tracking Message-ID: <99Aug3.180009edt.115609@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "'PJShoop@aol.com'" , linac-eng@plato1.aristotle.net Subject: RE: Service Reports and Repair Tracking Date: Tue, 3 Aug 1999 13:51:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We use our own program, written in VB. It uses an access database file to store all the data, with a VB front end. You can probably create a decent front end with access alone, but VB gives you more flexibility. It's a very useful tool, especially in a large environment with many machines. I can send you a demo if you want to try it out. Tom Feuerstake PMH Toronto -----Original Message----- From: PJShoop@aol.com [SMTP:PJShoop@aol.com] Sent: Tuesday, August 03, 1999 8:23 AM To: linac-eng@plato1.aristotle.net Subject: Service Reports and Repair Tracking Good morning, I would like to know what software you guys use for service reports and maint for tracking your repairs. My Physicist wants me to start using Microsoft Access for all work orders and service reports. Anyone out there use Access? If so, would you be willing to share the template(s)? Thanks Phil Shoop Maryland Regional Cancer Care ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Service Reports and Repair Tracking Message-ID: <756594fd.24d83927@aol.com> From: PJShoop@aol.com To: linac-eng@plato1.aristotle.net Subject: Service Reports and Repair Tracking Date: Tue, 3 Aug 1999 04:23:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good morning, I would like to know what software you guys use for service reports and maint for tracking your repairs. My Physicist wants me to start using Microsoft Access for all work orders and service reports. Anyone out there use Access? If so, would you be willing to share the template(s)? Thanks Phil Shoop Maryland Regional Cancer Care ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: ASTRO Meeting in San Antonio Message-ID: <000001bedadc$4ca2f1c0$6402d40a@z-cepc010.inhs.org> From: busht@shmc.org To: "@plato1" Subject: ASTRO Meeting in San Antonio Date: Fri, 30 Jul 1999 14:38:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Are any of you planning on attending the ASTRO meeting in San Antonio, TX this year? (Oct 30 thru Nov 4). If so, I would like to meet with you while there. I will be going just to see the latest thinking on IMRT and the new 120 leaf multileaf collimator and to see old acquantinces. Regards, Tom Bush Sacred Heart Med Center Spokane, Washington E-mail busht@SHMC.org ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: GFIL Con't Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: GFIL Con't Date: Fri, 30 Jul 1999 09:08:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" List: Seems my second problem was the LVPS on the hot deck (the ASTEC). No +5,+15, -15. Ordered a new one. I'll keep you updated after I install it. Thanks again for all of the suggestions! Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: GFIL Update Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: GFIL Update Date: Fri, 30 Jul 1999 02:53:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks for all of the suggestions. To answer some questions, our machine SN is 708. So far here is what we have done: Replaced all PCBs on the cold deck side with the exception of the backplane. We've had the entire gun deck out and checked most components on it. The transformer is fine. The thermistor we've heard so much about is jumpered out on our unit. We do have a large, flat, circular component which is not labeled. Looks like a capacitor, but is that a thermistor? We also took the hot deck section from one of our other units and put it in this machine. This seemed to fix our hot deck errors, but we still did not have our High Voltage. The problem being, we do not have our HV ENABLE signal. This leads me to believe that the HV is not on because for some reason or other, we are not getting that signal. We are in the process of tracing that signal now. Not easy. We've checked all the remedial things like the crowbar, I/L switches, low voltage power supplies, ect. I'm starting to think that the LVPS on the hot deck is screwed. That's what some other people say. Gotta run and get back to the grind! Suggestions welcome!! Thanks in advance, Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re: GFIL Message-ID: <002e01beda43$de116ae0$56a199d1@default> From: "Jeffrey L. Cressman" To: linac-eng Subject: re: GFIL Date: Thu, 29 Jul 1999 20:27:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" TWO possible causes come to mind: 1) Sounds like you have lost the AZTEC power supply in the hot deck. The AZTEC P.S. provides low voltage i.e.: +5V, +15V, -15V for use on the hot deck. It is located behind the Gun Driver PCB & Filament P.S. PCB and is on standoffs. Best way to see it and replace it I have found is to come in from the top by the accelerator solenoid / gun area. 2) Another possibility is a "wisker" has developed between your Grid and Cathode. If you pull the gun leads and ohm between Grid & Cathode it should read infinite. If you read a resistance, then "SHOCKING" the gun might clear the wisker. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: GFIL Message-ID: <862567BD.0082D4D4.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: GFIL Date: Thu, 29 Jul 1999 15:34:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We've had a number of failures fixed by replacing the A/D chip. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: GFIL Message-ID: <99Jul29.165132edt.115621@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: 'Carl Murphy' , linac-eng@plato1.aristotle.net Subject: RE: GFIL Date: Thu, 29 Jul 1999 12:42:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We've had our share of misery with the gun deck on our machines. I glanced through our machine history on the gfil problem. Most of the problems were cleared by re-booting the gun deck processor. Many of the problems were traced to a blown pigtail fuse on the gun deck power supply board. Fuses F1 and F2 are known to blow regularly. In addition, we've had a few problems with the gun deck motherboard pcb, one with a bad trace that was fixed, and one that was replaced outright. We're not using the serial link to diagnose. Too much info can be hazardous to your thinking! Good luck, Tom Feuerstake PMH Toronto -----Original Message----- From: Carl Murphy [SMTP:CCCHM@qe2-hsc.ns.ca] Sent: Thursday, July 29, 1999 2:43 PM To: linac-eng@plato1.aristotle.net Subject: GFIL Got a GFIL I/L that won't clear. Here's what I'm seeing on my serial link to my laptop: GDHO02: Grid Overvoltage. GDHD00: Grid Bias Undervoltage Limit. GDHO01: Filament Undervoltage. GDHD04: Hot Deck +5 Undervoltage Limit. GDHD06: Hot Deck +15 Undervoltage Limit. GDHD08: Hot Deck -15 Undervoltage Limit. GDHD10: Hot Deck Under Temperature Limit. GDHD15: Hot Deck A/D Converter Under Selftest Failure. GDOE07: Filament Delay active. GDOE10: No Hot Deck Power (HD off). GDOK00: Filament Current (A rms) = 0.000 GDOK01: Filament Voltage (V rms) = 0.000 GDOK02: Filament Power (W) = 0.00 GDOK03: Grid Voltage (V) = 300.0 GDOK04: HVPS Voltage (kV) = 19.57 GDOK05: Gun Average I (mA) = 0.003 GDOK06: Gun Peak I (A) = 0.056 GDOS02: 0 - Run I/L (Error pending). Mode = 2 The crowbar was defective, but we replaced it. It was sticking open so beware! High voltage was still on even though all indications (ie: lamps) were off. There is no Gun filament voltage or current. The cold deck boards are ok. The crowbar operates fine (as well as the microswitches on it). The filament ohmed through ok. Still investigating... Any ideas?? Thanks in advance, Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: GFIL Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: GFIL Date: Thu, 29 Jul 1999 10:43:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Got a GFIL I/L that won't clear. Here's what I'm seeing on my serial link to my laptop: GDHO02: Grid Overvoltage. GDHD00: Grid Bias Undervoltage Limit. GDHO01: Filament Undervoltage. GDHD04: Hot Deck +5 Undervoltage Limit. GDHD06: Hot Deck +15 Undervoltage Limit. GDHD08: Hot Deck -15 Undervoltage Limit. GDHD10: Hot Deck Under Temperature Limit. GDHD15: Hot Deck A/D Converter Under Selftest Failure. GDOE07: Filament Delay active. GDOE10: No Hot Deck Power (HD off). GDOK00: Filament Current (A rms) = 0.000 GDOK01: Filament Voltage (V rms) = 0.000 GDOK02: Filament Power (W) = 0.00 GDOK03: Grid Voltage (V) = 300.0 GDOK04: HVPS Voltage (kV) = 19.57 GDOK05: Gun Average I (mA) = 0.003 GDOK06: Gun Peak I (A) = 0.056 GDOS02: 0 - Run I/L (Error pending). Mode = 2 The crowbar was defective, but we replaced it. It was sticking open so beware! High voltage was still on even though all indications (ie: lamps) were off. There is no Gun filament voltage or current. The cold deck boards are ok. The crowbar operates fine (as well as the microswitches on it). The filament ohmed through ok. Still investigating... Any ideas?? Thanks in advance, Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: CL-2500 Motor driver Message-ID: <01bed9e1$1a908360$5bb34d0c@kpueschel> From: kevinpueschel To: linac-eng@plato1.aristotle.net Subject: CL-2500 Motor driver Date: Thu, 29 Jul 1999 08:40:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Anybody out there have a Clinac 2500 motor driver board p/n 00-854117-01 they would like to sell? Good or bad. If so, Please page me at 813 -216-0422. Kevin Pueschel ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: 2100C Carrousel Controller Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB434@liosex1.lio.se> From: Viking Eilert To: 'Randy Wick' , "Linac-Eng (E-post)" Subject: SV: 2100C Carrousel Controller Date: Thu, 29 Jul 1999 00:01:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Randy. A couple of years ago we had problem with the CARR/FOIL intlk on our = 2100C #248. Varian told us to lubricate the carrousel with Super lube spray. = You can reach it the best way at the front of the gantry towards the couch = by removing a lead block. After we did this at least once/twice a year we = have not had any problem. With the motor disconnected you should be able to easily rotate the carrousel by hand. It doesn't sound that this could really be the answer to you problem, = but you never know. Good luck. Eilert Viking. > -----Ursprungligt meddelande----- > Fr=E5n: Randy Wick [SMTP:rwick@bccancer.bc.ca] > Skickat: den 28 juli 1999 17:29 > Till: 'Linac-eng list' > =C4mne: 2100C Carrousel Controller >=20 > We have had a nagging problem with our 2100C s/n 265 (C2 machine). It > often > gets a CARR/FOIL i/lock, almost exclusively with 9e, that can be very > difficult to clear. The indicated hex error code is "OC" which is a = power > supply fault. However, the power supplies are good (scoped them for = AC > ripple, etc.) We swapped out the Carr. Controller and Interface PCB's = to > no > effect, and also the optocoupler IC that we THOUGHT gave the "power = supply > OK" signal to the Interface board. In all of this we were relying on = the > system drawing for the CARR i/l in the manual. >=20 > On closer examinination, we found that the IC # referenced on the = system > diag. for the opto-coupler did not exist on the auxillary backplane. = Also, > the schematic for the Interface PCB shows the Power Supply OK signal > coming > in (pin 22) and then being renamed Slow Down. Tracing the signal from = pin > 22 > back to the collimator, sure enough our manual shows this signal = (from pin > 22 on i/f) is patched in to the Slow Down signal in the Gantry Patch > panel. > "Slow Down" originates from one of the cam switches on the carrousel = which > indicate the carrousel position. >=20 > After cutting the PS OK trace and tying it to ground, we have many = less > CARR/FOIL faults. However, we still get the occasional one, again = mostly > with 9e, only now the hex code on the controller is "00" which means = no > fault indicated. Measuring the check pot on the carrousel, it = appeared to > be > off, so maybe there are two problems here. But we have not gotten any > Power > Supply faults "0C" since we tied the signal low. >=20 > My question is: does anybody know where the PS OK signal, on pin 22 = of the > Carrousel Interface card, comes from? We will have to pull out the > Auxillary > backplane to trace the signal and I definitely don't want to do that. >=20 > ------------------------------------ > Randy Wick Radiotherapy Service=20 > =20 > Vancouver Clinic > British Columbia Cancer Agency=09 > Vancouver BC Canada=20 >=20 > rwick@bccancer.bc.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mevasim S Message-ID: <000501bed921$939adaa0$74078ad1@oemcomputer> From: Joseph Czarnecki To: linac-eng@plato1.aristotle.net Subject: Mevasim S Date: Wed, 28 Jul 1999 09:49:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To the Group: Does anybody have procedures to calibrate position readouts (particularly the collimators or wires) on Siemens' Mevasim S? We have one and it seems there are no procedures to do this are at the site. This is the first real problem that we have had with this unit since we took over the site. Any help would be appreciated. Thank again, Joe Czarnecki RISS III BJC Health Systems St. Louis, MO 63110 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100EX problem area Message-ID: From: Randy Wick To: 'Linac-eng list' Subject: 2100EX problem area Date: Wed, 28 Jul 1999 07:43:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a 2100EX, that is nearing end of warranty, and we have had a problem that other EX owners might want to check into. The gantry display has been redesigned so that it is an LCD panel rather than discrete LED numbers. But in order to use this fancy new display a small toaster size PC computer is required which has been stuck inside the center of the gantry. Unfortunately, the cables coming from the stand have to rub back and forth across this every time the gantry rotates. At first glance this looks OK as there is no real pressure on the cables. However, twice now we have had to replace a cable (once after extensive trouble-shooting) that was worn through to the point where a wire or wires shorted out. Any other EX owners having this problem? ------------------ Randy Wick Radiotherapy Service Vancouver Clinic British Columbia Cancer Agency Vancouver BC Canada rwick@bccancer.bc.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100C Carrousel Controller Message-ID: From: Randy Wick To: 'Linac-eng list' Subject: 2100C Carrousel Controller Date: Wed, 28 Jul 1999 07:29:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have had a nagging problem with our 2100C s/n 265 (C2 machine). It often gets a CARR/FOIL i/lock, almost exclusively with 9e, that can be very difficult to clear. The indicated hex error code is "OC" which is a power supply fault. However, the power supplies are good (scoped them for AC ripple, etc.) We swapped out the Carr. Controller and Interface PCB's to no effect, and also the optocoupler IC that we THOUGHT gave the "power supply OK" signal to the Interface board. In all of this we were relying on the system drawing for the CARR i/l in the manual. On closer examinination, we found that the IC # referenced on the system diag. for the opto-coupler did not exist on the auxillary backplane. Also, the schematic for the Interface PCB shows the Power Supply OK signal coming in (pin 22) and then being renamed Slow Down. Tracing the signal from pin 22 back to the collimator, sure enough our manual shows this signal (from pin 22 on i/f) is patched in to the Slow Down signal in the Gantry Patch panel. "Slow Down" originates from one of the cam switches on the carrousel which indicate the carrousel position. After cutting the PS OK trace and tying it to ground, we have many less CARR/FOIL faults. However, we still get the occasional one, again mostly with 9e, only now the hex code on the controller is "00" which means no fault indicated. Measuring the check pot on the carrousel, it appeared to be off, so maybe there are two problems here. But we have not gotten any Power Supply faults "0C" since we tied the signal low. My question is: does anybody know where the PS OK signal, on pin 22 of the Carrousel Interface card, comes from? We will have to pull out the Auxillary backplane to trace the signal and I definitely don't want to do that. ------------------------------------ Randy Wick Radiotherapy Service Vancouver Clinic British Columbia Cancer Agency Vancouver BC Canada rwick@bccancer.bc.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: MAGNETIC FIELD NEAR ISOCENTER Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6D0C@radoncnt1.fccc.edu> From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: MAGNETIC FIELD NEAR ISOCENTER Date: Wed, 28 Jul 1999 05:11:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Everyone, I wanted to bring something to your attention. Our physics staff needed information about the Magnetic Field Strength of our Varian 2100C and Siemens Primus, because we have patients that have Implanted Defib Units. These Defib units are sensitive to magnetic field strengths of 10 gauss or higher. I posed the question to Varian and received a response from Tony Sorensen, Varian's RSO. His reply was: "Measurements have been made of the magnetic field near the isocenter of a Clinac 2100c. Measurements were made using a Bell Labs model 640 hall-effect gaussmeter. When the clinac was set in the 18MV photon mode the magnetic field at isocenter was approx. one third gauss. Measurements at other points in the patient plane yielded values under 1 gauss. Indeed, these values are comparable to the earth's magnetic field." I am also awaiting Siemens response for the MD & Primus Units. I hope that this information will help, if you also have this problem. Bill Barnes, BSEE Bio Engineer Radiation Oncology Fox Chase Cancer Center Philadelphia Pa 215-728-2997 b_barnes@fccc.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Linear Accelerator Pay Scale Message-ID: <2d19013c.24cf91e7@aol.com> From: Radsrus@aol.com To: BurkeT@genesishealth.com, linac-eng@plato1.aristotle.net Subject: Re: Linear Accelerator Pay Scale Date: Tue, 27 Jul 1999 14:51:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Tim, Typically, an experienced rep starts at 60+K per yr, 4 weeks paid vacation, co. car, & full benefits w/401K and profit sharing. An inexperienced rep just starting out can expect to start at 50-75% of that pay level depending on the type of prior experience however can move up quickly once they have proven themselves in the field. We are always looking for a few good reps! Hope this helps, Steve Schwarz, Acceletronics ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Linear Accelerator Pay Scale Message-ID: From: Tim Burke To: "<" Subject: Linear Accelerator Pay Scale Date: Tue, 27 Jul 1999 06:35:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I am a Biomed supervisor in the Midwest. We are starting a linear accelerator service program at my hospital. I would appreciate if anyone would care to offer an opinion on what a reasonable pay scale is for a service engineer, from entry level to top out. Reply either to this list or directly to my email. Thanks, Tim Burke, CBET Biomed Supervisor Genesis Medical Center Davenport, IA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian C2 couch motor Message-ID: <766f8d34.24ce3dee@aol.com> From: Accelinear@aol.com To: Rtsolution@aol.com, linac-eng@plato1.aristotle.net Subject: Re: Varian C2 couch motor Date: Mon, 26 Jul 1999 14:40:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The couch long/lat motor can be purchased from Technical Options at (770) 319-9640. They usually have the lowest prices on such items. Marty Shapiro ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron Couch Message-ID: <379CB3DE.FA0E2636@scf.sk.ca> From: Massimo Giovannetti To: linac-eng@plato1.aristotle.net Subject: Ximatron Couch Date: Mon, 26 Jul 1999 11:15:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, We have an Ximatron Simulator #705 with a couch problem. Every so often...maybe once or twice a month, we get a problem where the couch will move approx. 4 more inches vertically in the upward direction when all motion enable and switches have been released. The problem occurs mostly when using the left hand pendant but it has been seen on the right one as well. So far it has only shown up in that direction of motion. We have ruled out the problem being an electronic one and are leading towards the software. Has anyone heard of this? Also, does anyone know the calibration procedures for the rocker pots on the hand pendants? Manual shows test procedures but no fixes if you find a problem. Thanks. Massimo Giovannetti Allan Blair Cancer Centre Regina, Sask., Canada (306)766-2286 mgiovannetti@scf.sk.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fwd: Accelerator Eng/Tech Society Message-ID: <4.1.19990723184515.00922870@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net Subject: Fwd: Accelerator Eng/Tech Society Date: Fri, 23 Jul 1999 14:46:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Linac engineers, sorry for the late posting, I just got this message today. Maybe some of you will be able to attend. JS >From: khogstro@notes.mdacc.tmc.edu >X-Lotus-Fromdomain: MDACC >To: paltajr.radonc@shands.ufl.edu, ashiu@notes.mdacc.tmc.edu, > somers@radonc17.ucsf.edu, sternick@nomos.com, > twaldron@notes.mdacc.tmc.edu >Date: Thu, 22 Jul 1999 11:41:33 -0500 >Subject: Accelerator Eng/Tech Society > >To all: > >Thank you for your interest in assisting the acelerator engineers/technologists >to become professionally organized and in finding a way for them to meet in >conjunction with our annual meeting. To discuss these goals, there will be an >initial breakfast meeting of interested parties on Monday, July 26, from >7:30-8:15 in my suite at the Opryland Hotel. > >My goal is for us to become an official ad-hoc committee of the AAPM. I >envision our charge to be: > > 1. Establish and execute a mechanism for the formation of a professional >society for medical accelerator engineers and technicians. > 2. Establish a mechanism to generate a roster of interested individuals, >institutions, and companies. > 3. Develop and get approved by the AAPM a program for the Y2000 annual >meeting in Chicago. > 4. Identify appropriate membership of the ad hoc committee. > 5. Modify these charges as needed. > >Regarding potential members, we will need active committee members and an >effective chair. Below are people who may be interested and an indication of >whether they have been contacted and will be at Monday's meeting: > >AAPM Members > Kenneth Hogstrom Interim chair > Jatinder Palta Will attend meeting > Almon Shiu Will attend meeting > Larry Berkley Supportive; not at AAPM meeting this year > Ned Sternick Willing to assist; unable to attend this meeting > >Engineers > Tim Waldron M D Anderson-head of acc. maintenance; AAPM member; >M S >medical physicist; very > interested; not at AAPM meeting this year > John Somers UCSF- acc engineer > Jim Beatty CARTI-head of acc. maintenance; leader in previous >effort at ASTRO meeting > >Look forward to seeing those that can attend Monday. > >Ken Hogstrom >AAPM President Elect > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <2AA7D832413@medphysics.leeds.ac.uk> From: Bashar Al-Qaisieh To: majordomo@plato1.aristotle.net, linac-eng@plato1.aristotle.net Subject: Date: Fri, 23 Jul 1999 10:36:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Bashar Al-Qaisieh 23 Marian Terrace, Woodhouse, Leeds, LS6 2UB, England. U.K Dear Sir, I have a bachelor's degree in Physics from Yarmouk University in Jordan (1995) and I am currently an M.Sc. student of Medical Physics at the University of Leeds, expecting to graduate in September 1999. I have worked as a Physics teacher for 3 years, from 1995 to 1998, at R.A.M.S. where I taught high-school level students. Before engaging in my PhD research project, which shall be a development of my current M.Sc project in Vascular Brachytherapy, I should very much like to have some sort of experience as a Clinical Physicist, more specifically in Radiotherapy or Nuclear Medicine. Since I am familiar with the theoretical aspects of Medical Physics, it appears that the application of such theories should perhaps provide me with a better-grounded knowledge and experience for the accomplishment of my post-graduate studies. I am seeking after either a trainee course or, if at all possible, a grant for my PhD. Should I be eligible for a grant, I should be grateful if you could send the relevant information to me. I look forward to hearing from you. Yours faithfully, Bashar Al-Qaisieh ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; name="ATT41027.txt" Content-Disposition: attachment; filename="ATT41027.txt" Content-Description: Attachment information. The following section of this message contains a file attachment prepared for transmission using the Internet MIME message format. If you are using Pegasus Mail, or any another MIME-compliant system, you should be able to save it or view it from within your mailer. If you cannot, please ask your system administrator for assistance. ---- File information ----------- File: cv.doc Date: 6 Jun 1999, 17:28 Size: 12800 bytes. 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King" To: "Wilson, Jim" Subject: Re: Used Linac Sale Date: Fri, 23 Jul 1999 08:57:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Jim, I was wondering if you still had these units available and if you could email me more info on the systems. Thank you, Scott King. or phone (760)954-2580 "Wilson, Jim" wrote: > Ladies and gentlemen, > We are in the midst of putting together a new radiation therapy > department in our facility. Since the plan is to move to a new area, we are > strongly considering selling our current equipment and buying new. We > currently have a Varian Clinac-2100c SN 256 Version 3 Software with the new > style applicators. > Also a Varian Clinac-4 SN 98 and a Toshiba LX30 Simulator. We would like to > receive bids for this equipment if anyone is interested or knows of someone > who is. Please send inquiries to rrodriguez@providence.org or reply back to > me. > Thank you, > Jim Wilson > Clinical Engineering > Providence Health Systems ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600c 4 port circulator Message-ID: From: SMcna39074@aol.com To: linac-eng@plato1.aristotle.net Subject: 600c 4 port circulator Date: Wed, 21 Jul 1999 20:28:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" FYI: Having a SF6 gas leak at the circulator; s/n73. Badly corroded original part (3 port device) Replaced with new varian 4 port circulator--leaks gas at 6 months. Now find that tuning wand waveguide section should have been replaced with circulator as a pair. Wand section no longer needed with 4 port circulator. AFC works with wand at end of range. Note to all if you need to change circulators. Stan at Cancer Foundation, Santa Barbara, ca. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: BONR Message-ID: From: Carl Murphy To: clbartee@hsc.vcu.edu, linac-eng@plato1.aristotle.net Subject: Re: BONR Date: Wed, 21 Jul 1999 10:58:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris: The cap you are looking to install goes from pin 9 on U10 (74HC541) to logic ground. It is 0.1 microfarads. Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca >>> Chris Bartee 07/21 11:43 AM >>> Accelerator borg More on the BONR saga, this is a 600c s/n 273, the info i am seeking is the size of the cap, and where to install in the Dedicated keyboard, Thanks, Christopher L. Bartee Medical College of Virginia, VCU ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian 2100C w/PV gantry balance Message-ID: <457B79AC7AB2D211AAAC006097BDA6530624C1@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Paul Twyman' Cc: 'Linac Engineer ListServ' Subject: RE: Varian 2100C w/PV gantry balance Date: Wed, 21 Jul 1999 12:08:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Paul, I finally got around to devoting some time to the PV and my counterbalance problem. Your suggestion was right on track! There were three steel plates nestled on the R-Arm side. After removing these plates, I was able to properly balance my gantry. Thanks, I appreciate your comments! Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Paul Twyman Sent: Monday, June 07, 1999 11:16 AM To: RKimball@radonc-uc-po.mcis.uchicago.edu Subject: Re: Varian 2100C w/PV gantry balance This sounds familiar. We have a 600C here at Addenbrookes and suffered from exactly this problem. Our PV was installed with some of the thin steel counter weights still in place at the bottom of the gantry and to compensate for this many additional small weights had been added to the top of the gantry. Check that the installation has not been completed with any of the large plates ( behind the PV assy) left in place. If your gantry is that far out of balance you may well suffer from rotational therapy faults. Hope this helps. Paul Twyman Medical Physics Addenbrookes Hosp. Cambridge England Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Magnetron vs. Klystron Message-ID: <3cc5143c.24c6939d@aol.com> From: SMcna39074@aol.com To: CraigP@ahsl.co.nz Cc: linac-eng@plato1.aristotle.net Subject: Re: Magnetron vs. Klystron Date: Tue, 20 Jul 1999 19:08:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In a message dated 7/20/99 12:59:50 PM Pacific Daylight Time, CraigP@ahsl.co.nz writes: difference between magnatron and klystron. I thought the short answer was that a magnatron was a diode that acts like an oscillator and an amplifier to generate high power microwaves; and a klystron is an amplifier only of microwaves that needs an external oscillator to operate. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Magnetron vs. Klystron Message-ID: From: Craig Pearce To: 'Tareq Ammer' Cc: 'linac eng' Subject: RE: Magnetron vs. Klystron Date: Tue, 20 Jul 1999 11:53:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Litton has a page on their web site that offers data on their range of electron devices intended for linac use. It can be found at http://www.littonedd.com/medical/med_2.html There is also this article on high power electronic tubes that may help you http://www.littonedd.com/tubearticle/tube.html > Could some one please explain to me what is the difference between a > Klystron and a Magnetron? > Craig Pearce Technical Officer Medical Physics and Clinical Engineering Auckland Healthcare Services Ltd Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Magnetron vs. Klystron Message-ID: <199907201842.NAA13251@ares.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: linac-eng@plato1.aristotle.net Subject: Re: Magnetron vs. Klystron Date: Tue, 20 Jul 1999 10:42:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Dear Linac Engineers: > > Could some one please explain to me what is the difference between a > Klystron and a Magnetron? > > Thanks in advance. > > Regard, > > Tareq > > > _______________________________________________________________ > Get Free Email and Do More On The Web. Visit http://www.msn.com > Magnetron: -Lower power (usually 2-3 MW peak) -Smaller -Usually less expensive ($10K-$20K for common ones) -Produces its own microwave (no R.F. driver needed) -Can be more troublesome (some like to arc and spark occasionally) -Can radiate more noise into unrelated sections of the accelerator causing headaches. -Doesn't need a large pulse tank and focusing solenoid like the Klystron. Klystron -High peak power (5-8 MW peak typ.) -Much larger than a magnetron (at least at that power level) -More expensive (X2 to X4 the price of a magnetron depending on model) -Acts as an amplifier only (needs an R.F. driver for a signal source) -Needs a focusing solenoid and associated power-supplies -Needs larger pulsetanks to handle the power (Siemens has gone to high-frequency conversion to reduce the size of the pulsetank in the Primus, but that entails having to add the switching electronics) -Seems to radiate less unwanted noise into the machine. -Little or no arcing-sparking -Longer lifetime than a magnetron. Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Magnetron vs. Klystron Message-ID: <199907201826.LAA21853@oboe.radonc.washington.edu> From: Bob Giansiracusa To: tareqammer@hotmail.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Magnetron vs. Klystron Date: Tue, 20 Jul 1999 10:26:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > From: "Tareq Ammer" > Date: Tue, 20 Jul 1999 11:28:06 CDT > > Dear Linac Engineers: > > Could some one please explain to me what is the difference between a > Klystron and a Magnetron? > > Thanks in advance. > > Regard, > > Tareq A klystron is a vacuum tube in which electrons drift through an electric field which is varying at a microwave rate, causing them to bunch up (they are alternately slowed down and speeded up as the field changes direction). As they then drift (after passing out of that field), the bunches become more pronounced -- faster electrons catch up to slightly slower ones just ahead of them, etc. The stream then pass through a region in which the bunches are converted to a stronger output electric field (varying at the same microwave frequency as the input field) -- hence MICROWAVE AMPLIFICATION. And where there is amplification, by feeding some of the output back to the input, you get OSCILLATION and hence microwave generation. A magnetron is a vacuum tube in which electrons spiral around in a path constrained by an external magnetic field (hence the name). As they spiral around, they pass a gridwork of metal openings in which a microwave field is induced, much like a sound is produced by blowing across the top of an open bottle. Both are vacuum tubes used to generate microwave energy, which is then used as the electric field to accelerate the particles (usually electrons) in a linac. Bob Giansiracusa Univ of Washington Dept of Radiation Oncology (and a former electrical engineer) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Insurance Policies Message-ID: <199907201810.NAA20541@ares.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: linac-eng@plato1.aristotle.net Subject: Re: Insurance Policies Date: Tue, 20 Jul 1999 10:10:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Hello Listers > > The Hospital I work in is considering signing on to an enterprise wide insurance policy. Supposedly there will be a rather large pool created to cover the cost of all repairs (radiation, radiology, surgery, biomed, etc. etc.). The device covered will be serviced by "The Vendor of Choice" and be billed against the pool for time and materials. We are told that we will not have to preauthorize service call nor parts purchases. All software upgrade components of service agreements are negate by this policy and will have to be purchased separately. Once the pool is depleted the insurance company will cover the cost of repairs. > My question: Are any of you operating under similar policies. If so, what type of problems have arisen and/or what benefits have you seen. > To avoid cluttering up the list you can E-Mail me directly. > Thanks in advance > > Bob Lindeyer > Rlindey@Harthosp.org > Radiation Oncology > Hartford Hospital > Hartford, CT USA > I would try to be certain that they truly will not require any pre- authorization regarding parts purchase (some do, some don't) . My experience when I worked for an O.E.M. was that there was often a delay in parts authorization while the insurance company tried to second-source expensive components. The insurance companys often seemed suprised at the high cost of accelerator parts. Companys used to parts costs related to typewriters, copyers, or even regular diagnostic X-ray equipment often choke after being faced with a $20K-60K R.F. driver, or a $70K-100K waveguide or Klystron. With an independent company now, I often get calls from insurance companys looking for lower prices on O.E.M. parts. Sometimes we can help, sometimes we can't, but the calling process can eat up downtime and shipping time windows. Other than that issue, and some additional paperwork involved, the insurance route seems to work well for many sites. Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Aerotech controllers Message-ID: <2.2.32.19990720160136.0068709c@southcom.com.au> From: Andrew Cramond To: linac-eng@plato1.aristotle.net Subject: Re: Aerotech controllers Date: Tue, 20 Jul 1999 08:01:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 09:36 15/7/99 +1200, you wrote: >G'day all, >We have an anoying little problem with our gantry aerotech board (Varian 2100C #40). > >What happens is, about once per day the 'trip' light lights and gantry/couch movements stop. > >The motor, cables, settings, measured currents etc look OK. Greetings Dave, You have me dredging the past a bit with this but, I recall the same symptoms on 2100C #14 many years ago - annoying to the extent that I drilled two 1/4inch holes in the top-cover of the Auxiliary Electronics Chassis, so that I could reset either aerotech board with a piece of plastic rod. What was eventually found was that the clunking of one of the heavy contactors or relay assemblies (the one which pulls with motion enable, maybe?), was causing so much vibration that it upset itself or some other smaller relay with contact-bounce. This problem was identified by one of Varian's field engineers when contacted at the time and he was able to supply some "resilient mounts", to mount the large contactor(s) on. I can't recall but, this may have been an official Varian modification instruction. It was for the same reason that axillary electronics chassis later came from the factory with the large contactors already mounted in this way. Resilient-mount is the name for those assemblies which have a metal thread on each end joined by a flexible rubber rod. The size supplied had about 3/16" threads X about 5/16"long, the rubber piece was approximately 5/16"dia and about the same in length. Cheers. Andrew. Andrew Cramond Santry Dublin 9 Ireland +353 87 681 0545 mobile +353 1 842 2559 home ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian couch motors Message-ID: From: Kerry Clark To: "'linac-eng@plato1.aristotle.net'" Subject: Varian couch motors Date: Mon, 19 Jul 1999 17:26:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, we have had a resent problem with the longitudinal brake/clutch on the couch of our 18 mth old Varian 600 c/d (sn 483) burning up. This assembly, we believe is only rated at 24v, but the so called 27v power supply in the stand puts a whopping 32v on it (making it nice and warm). Our new 2100 also exhibits the same voltage. We believe this varies with local mains voltage, but I think this is to high and was the cause. Does anyone have such a high voltage on their 24v couch motors/clutches/brakes? And does anyone have a solution for this problem? cheers for your time, Kerry. Kerry Clark Engineering Technician Auckland Hospital (09) 307-4949 ext 6213 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1EB2C38D998ED211B83400805F853AFE081EBF@europa.emh.org> From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Date: Mon, 19 Jul 1999 12:19:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good day all, We have 2 2100c/d's with enhanced dynamic wedge. My physicists is starting to think about how to commission the dynamic wedges. I'd appreciate any input from those of you that have gone through the commissioning process might have. Mike Denning Eastern Maine Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Equipment for sale Message-ID: <379382DC.FC21D7BD@oncologysystems.com> From: esuarez@oncologysystems.com To: linac-eng@plato1.aristotle.net Subject: Equipment for sale Date: Mon, 19 Jul 1999 11:56:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a late model Varian 600C linear accelerator, with very low beam hours, available for purchase. Interested parties contact: Radiation Oncology Systems, LLC P.O. Box 12911 La Jolla, CA 92039-2911 Phone (619) 671-9900 Fax (619) 671-9909 Web www.oncologysystems.com E-mail info@oncologysystems.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Morning Checkout Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6D03@radoncnt1.fccc.edu> From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: FW: Morning Checkout Date: Mon, 19 Jul 1999 11:21:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Joe, Bill Barnes, BioEngineer @Fox Chase Cancer Center of Philadelphia. We treat about 150 people daily and we currently have a 2100C, 6/100, MD2 ,2 HDR's and a Orthovoltage unit. We are installing an additional 4 new Primis units in September. We perform daily DCT(Diode unit) tests on all systems, and that is performed by the Techs (RTT's) with Physics daily review. Bill Barnes, BSEE Bio Engineer Radiation Oncology Fox Chase Cancer Center Philadelphia, Pa. 215-728-2997 b_barnes@fccc.edu -----Original Message----- From: Joseph Czarnecki [mailto:joeczarn@mindspring.com@mindspring.com] Sent: Friday, July 16, 1999 9:19 PM To: linac-eng@plato1.aristotle.net Subject: Morning Checkout Dear fellow service engineers: I would like to take an informal survey to settle a long standing arguement at my facility. It is two very simple questions, how many of you perform morning checks (Morning Checkout, constantcy checks, etc.) for your respective facilities and approxiamately how many patients does your facility treat each day? Feel free to e-mail me direct or post it to the list server. Thank you for your cooperation, Joe Czarnecki RISS III BJC Health Systems/Mallinckrodt Institute of Radiology St. Louis, MO 63110 e-mail: joeczarn@mindspring.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: T-1000 Regulator Message-ID: <379355E4.C413B779@scf.sk.ca> From: S Thiesson To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: T-1000 Regulator Date: Mon, 19 Jul 1999 08:44:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a T1000 as well, serial number 16. Maybe they got the bugs out with yours! We haven't noticed a problem with air regulation in the head. I guess I have a few questions. Why is the slight variation a problem? Are you having variations in transit time? Can you measure the variation with any accuracy? How are you measuring the variation, with the drawer moving or at rest. Maybe this is just a gauge problem, I don't imagine they are all that accurate. As for using hospital air...I don't think it is a good idea. I have never had any problem with the gantry mounted unit. The advantage it offers is the large air reservoir in case of power failure. Why would you want to complicate your life relying on anything the hospital provides? Also the liability issue rears its ugly head. Scot Thiesson Allan Blair Cancer Centre Regina Sask. Canada Carl Murphy wrote: Hi folks: Good to see everyone has had their coffee and read their email today. It's the most action I've seen on the list in a while! We have a Theratronics T-1000 S/N 15. We have had numerous complaints about the air pressure regulator in the source drawer part of the machine. I believe that regulator is made by Shrader Bellows and is supposed to regulate to 25 PSI. Theratronics specs say that it should regulate within +/- 2 PSI. However, our regulator never has regulated that well. We have tried replacing it several times, but we just got simlar results. We have seen it go down as far as 21 PSI. We want to switch to the Norgren regulator that they used on the older T25's and others. This one apparently regulates quite well. We have had a lot of resistance from Theratronics in regards to changing this regulator. We want to change the regulator and we also want to use hospital supplied compressed air instead of using the compressor in the stand of the unit. Has anyone out there with a similar unit experienced the same problem? Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: T-1000 Regulator Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: T-1000 Regulator Date: Mon, 19 Jul 1999 07:45:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi folks: Good to see everyone has had their coffee and read their email today. It's the most action I've seen on the list in a while! We have a Theratronics T-1000 S/N 15. We have had numerous complaints about the air pressure regulator in the source drawer part of the machine. I believe that regulator is made by Shrader Bellows and is supposed to regulate to 25 PSI. Theratronics specs say that it should regulate within +/- 2 PSI. However, our regulator never has regulated that well. We have tried replacing it several times, but we just got simlar results. We have seen it go down as far as 21 PSI. We want to switch to the Norgren regulator that they used on the older T25's and others. This one apparently regulates quite well. We have had a lot of resistance from Theratronics in regards to changing this regulator. We want to change the regulator and we also want to use hospital supplied compressed air instead of using the compressor in the stand of the unit. Has anyone out there with a similar unit experienced the same problem? Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Morning Checkout Message-ID: <3793467B.C1274572@dibbs.net> From: Gil Head To: 'linac eng' Subject: Re: Morning Checkout Date: Mon, 19 Jul 1999 07:38:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" james pinkerton wrote: > > We treat around 70 patients per day on 2 linacs and one simulator. We also do > HDR, LDR, Prostate Seed Implant. I do the warm up every day except Wed. when > the techs do it to keep in practice. > > I do the warmup early since that seems to be when the most machine failures > occur. By arriving very early I can usually fix whatever with on patient > impact. > > Regards, > > Jim Pinkerton > Parkland Hospital > Dallas > > Joseph Czarnecki wrote: > > > Dear fellow service engineers: > > > > I would like to take an informal survey to settle a long standing arguement > > at my facility. It is two very simple questions, how many of you perform > > morning checks (Morning Checkout, constantcy checks, etc.) for your > > respective facilities and approxiamately how many patients does your I do morning warm-up and QA on our three accelerators every day. I arrive early enough to fix most problems (most easy problems?)before patient treatment begins. Jim is correct about most failures do seem to happen during warm-up. I also think that not rushing or cheating warm-up reduces problems. We use a RBA3 for our morning constancy and flatness checks. Gil -- "Suppose you were an idiot. And suppose you were a member of Congress. But I repeat myself." Mark Twain ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Morning Checkout Message-ID: <862567B3.0051D39B.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: Morning Checkout Date: Mon, 19 Jul 1999 06:41:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At our facility we are in full compliance with the AAPM TG-40 QA reccommendations. What that means is that: 1. Output constancy, mechanical, and safety checks are performed daily on each machine by the therapists. 2. Flatness and symmetry are checked weekly. A more complete mechanical and safety check is also performed weekly. This is done by our QA dosimetrist. 3. Output and energy are checked by a qualified medical physicist using a calibrated instrument monthly. 4. All relevant mechanical/beam parameters are checked and reviewed annually by qualified medical physicists. We currently treat roughly 340 external beam patients per day on 10 linacs (3 others linacs are bieng moved, decommissioned or installed at this time), 1 orthovoltage and 1 cobalt machine. Tim Waldron UTMDACC ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Morning Checkout Message-ID: <4510ED9293BFD1119D280008C7280D620283BB88@ex1.gstt.sthames.nhs.uk> From: Stuart.Vessey@gstt.sthames.nhs.uk To: joeczarn%mindspring.com@mindspring.com, linac-eng@plato1.aristotle.net Subject: RE: Morning Checkout Date: Mon, 19 Jul 1999 06:04:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At this site (St Thomas')we have a number of machines 2 Theratronics T1000 cobalt machines: Morning QA's performed by Radiographers (typically light field sizes, crosswires, lasers etc) 2 Ximatron Simulators : Morning QA's performed by Radiographers(also xray tube warmup) 2 superficial units- again QA's performed by Radiographers 2 ABB Linacs - one LA6 single energy; runups performed by either Radiographers or us technical staff, this includes constancy checks using a Radiation Beam analyser and radiation field size check using Xcelite. In addition, when handed over to the Radiography staff, they perform QA's as described above. The other linac is an LA20, twin photon + electron machine.This machine is only run up by us techies (or occassionally a physicist). Constancy checks are performed on this machine, but normally only on one of the photon energies, and on half of the electron energies. This means that each energy is checked on alternate days. Again Radiographers perform their own QA checks. Patient load, this I found quite amusing ( as probably did any one else from a UK hospital). Our TYPICAL load on EACH linac is in the order of 55-60 pts per day. It is by no means unknown (or even uncommon) for them to treat in excess of 70pts per day. Regards Stuart E Vessey -----Original Message----- From: Joseph Czarnecki [mailto:joeczarn@mindspring.com@mindspring.com] Sent: 17 July 1999 02:19 To: linac-eng@plato1.aristotle.net Subject: Morning Checkout Dear fellow service engineers: I would like to take an informal survey to settle a long standing arguement at my facility. It is two very simple questions, how many of you perform morning checks (Morning Checkout, constantcy checks, etc.) for your respective facilities and approxiamately how many patients does your facility treat each day? Feel free to e-mail me direct or post it to the list server. Thank you for your cooperation, Joe Czarnecki RISS III BJC Health Systems/Mallinckrodt Institute of Radiology St. Louis, MO 63110 e-mail: joeczarn@mindspring.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Morning Checkout Message-ID: <1EB2C38D998ED211B83400805F853AFE081EBE@europa.emh.org> From: "Denning, Mike" To: Joseph Czarnecki , "Linac-eng (E-mail)" Subject: RE: Morning Checkout Date: Mon, 19 Jul 1999 05:29:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have 3 linacs. Two 2100c/d's and a 6-100. Both of the 2100's have PV and one has MLC, 52 leaf. We also run a Philips RT 250 ortho machine. We have a Picker AcQsim and a Cascade simulator. Patient load is approx 100 pts a day average. When fully staffed we have 2.5 therapists per machine. The lead therapist floats in addition to her other duties. Morning Check/warm-up is done by the therapists on all of the equipment. They do gantry, collimator, field size, ODI and laser checks. We use Sun Nuclear Profiler for daily consistency checks, (a very useful and capable device, our physicist loves it). I keep fairly tight tolerances for the therapists for morning checks. If they have a problem I usually hear about it first thing in the morning. I review each mornings check sheet sometime during the day each day. The simulators have there own specific checklists that the simulation tech does each morning. Mike Denning Eastern Maine Medical Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Morning Checkout Message-ID: <013e01bed08b$a4a71f00$790110ac@RPC021.abcc_domain> From: Peter Dickof To: Joseph Czarnecki Cc: linac-eng@plato1.aristotle.net Subject: Re: Morning Checkout Date: Sat, 17 Jul 1999 11:36:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" >Dear fellow service engineers: > >I would like to take an informal survey to settle a long standing arguement >at my facility. It is two very simple questions, how many of you perform >morning checks (Morning Checkout, constantcy checks, etc.) for your >respective facilities and approxiamately how many patients does your >facility treat each day? Feel free to e-mail me direct or post it to the >list server. RTTs perform alignment checks: (coll rotation, gantry rotation, lasers) during klystron warm-up. They then do constancy measurements with ion chamber in a jig permanently attached to a block tray during the morning beam run-up and follow up with checks of door interlocks, etc. WARNING: Load is _very_ tricky to compare! At our clinic, we have three RTTs staff a machine for a work day from 8:00 to 16:30 with 45 minutes for lunch and 15 minutes for coffee. Load varies; someone mentioned to me a few days ago that we had 40 pts on one machine, an all time high. Load in the low to mid 30's is more typical for that machine: a Varian 2100C, with a V&R system (no automated setups) which treats mostly pelvises at high energy; an average of about 3.5 fields per patient. Essentially all fields are blocked with fixed custom coded block trays (no MLC, no dynamic wedge). No calculations of any sort are ever done by the staff on the machine; all are referred to the planning area. Peter ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Morning Checkout Message-ID: <37908606.E0D0A4DC@yale.edu> From: "Peter E. Vitali" To: Joseph Czarnecki Cc: linac-eng@plato1.aristotle.net Subject: Re: Morning Checkout Date: Sat, 17 Jul 1999 05:33:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Joe: In my previous reply I thought the word "you" meant the department but after reading it again I interpreted it to mean me personally. I do not do constancy checks or morning warm-ups on the machine unless I am need them for service work or to get a baseline number. My feeling is that if you PUSH THE BUTTON to treat a patient then it is your responsibility to know how the machine you are using is operating prior to treating a patient. At this time you may decide that it is not functioning properly and you may not want to treat patients with it. This is the Therapist's call, not the engineers. It is all a matter of RESPONSIBILITY. Also since there are many therapists in a department and many machines with only a few engineers if any, the group can do it in a shorter span of time than the engineer. We treat from 80 to 100 patients a day. Pete Vitali ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Morning Checkout Message-ID: <37909CEE.C9AF32AB@connect.net> From: james pinkerton Reply-To: jimkaren@connect.net To: Joseph Czarnecki <"joeczarn@mindspring.com"@mindspring.com> Cc: linac-eng@plato1.aristotle.net Subject: Re: Morning Checkout Date: Sat, 17 Jul 1999 07:10:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We treat around 70 patients per day on 2 linacs and one simulator. We also do HDR, LDR, Prostate Seed Implant. I do the warm up every day except Wed. when the techs do it to keep in practice. I do the warmup early since that seems to be when the most machine failures occur. By arriving very early I can usually fix whatever with on patient impact. Regards, Jim Pinkerton Parkland Hospital Dallas Joseph Czarnecki wrote: > Dear fellow service engineers: > > I would like to take an informal survey to settle a long standing arguement > at my facility. It is two very simple questions, how many of you perform > morning checks (Morning Checkout, constantcy checks, etc.) for your > respective facilities and approxiamately how many patients does your > facility treat each day? Feel free to e-mail me direct or post it to the > list server. > > Thank you for your cooperation, > Joe Czarnecki > RISS III > BJC Health Systems/Mallinckrodt Institute of Radiology > St. Louis, MO 63110 > e-mail: joeczarn@mindspring.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Morning Checkout Message-ID: <37907AFE.64D788E@yale.edu> From: "Peter E. Vitali" To: Joseph Czarnecki Cc: linac-eng@plato1.aristotle.net Subject: Re: Morning Checkout Date: Sat, 17 Jul 1999 04:45:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Joe: At Yale-New Haven Hospital Radiation Therapy Department the therapists do 3 linacs, 1 simulator and 1 orthovoltage machine every weekday (Mon. - Fri.) during warming up the machines. For the linacs it includes: Dose constancy using diodes for all energies of the machine, Light field check, Laser alignment, and ARC rotation. On the simulator the therapists do light field, wires, lasers, readouts and X-ray production daily. The orthovoltage is check for dose constancy daily. All discrepancies are reported to the physicists. Pete Vitali ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Morning Checkout Message-ID: <000f01becff2$549a82c0$36b28ad1@oemcomputer> From: Joseph Czarnecki To: linac-eng@plato1.aristotle.net Subject: Morning Checkout Date: Fri, 16 Jul 1999 17:18:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear fellow service engineers: I would like to take an informal survey to settle a long standing arguement at my facility. It is two very simple questions, how many of you perform morning checks (Morning Checkout, constantcy checks, etc.) for your respective facilities and approxiamately how many patients does your facility treat each day? Feel free to e-mail me direct or post it to the list server. Thank you for your cooperation, Joe Czarnecki RISS III BJC Health Systems/Mallinckrodt Institute of Radiology St. Louis, MO 63110 e-mail: joeczarn@mindspring.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: BONR Message-ID: <378F4EA0.158EA2E6@hsc.vcu.edu> From: Chris Bartee To: Linac List Server Subject: BONR Date: Fri, 16 Jul 1999 07:24:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My question to the brain trust, is about the notorious BONR, I have a 600c s/n 273, i just replaced the keyboard, so I am particularly curious about the information on the cap, in the keyboard. Any info would be greatly appreciated Chris Bartee ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: (??) YLD Faults - Revisited Message-ID: From: hskang1@samsung.co.kr To: linac-eng@plato1.aristotle.net Subject: (??) YLD Faults - Revisited Date: Thu, 15 Jul 1999 16:54:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I had same problem yersterday.Machine is Varian 600c. Finally I fix the problem.I check AFC function and find out that AFC function is bad. First of all I suggest to check AFC control motor.Our problem is motor looses the shaft. So AFC motor runs normally but AFC doesn't run. Then I thighten the shaft with hex wrench. I hope this mail is helpful to you. Good luck ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Humphrey valve replacements Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Humphrey valve replacements Date: Thu, 15 Jul 1999 15:33:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My appologies.... We also used Norgren's nugget 50 in the earlier days. Dave. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Replacements for Humphrey Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Replacements for Humphrey Date: Thu, 15 Jul 1999 14:16:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A colleague wrote....... Hey Dave, Why the tease, what is the data on the new valves you are using? A lot of us would like to give them a try. ------------------------ All right I'll come clean. We use NORGREN nugget 100. They are dismemberable for repair with replacement parts available. There is also a manual operator on the unit. You should have seen the bloke in the shop's face when I asked how these units stood up to a radiation environment. The plumbing is slightly different as it comes in Christchurch (first left after Australia) in not US threads. There are also two seperate outlet ports (one for each direction). We fit SiFlo (or something like that) plugs in each. These things are a variable restrictor. It has made the ENSW real easy to plumb now as the regulator fits straight into the valve, which feeds the ram and we use the two SiFlos as replacements for the needle valve thingys. Much tidier. There may be a more suitable unit available now, Varian may even be able to provide a retrofit kit to upgrade to their newer valves -hint-hint-. DaveP. ************************************************** There's only one sure thing in life, that's doubt.......I think. Good bye pork pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Humphreys Pnuematic valves. Message-ID: From: Craig Pearce To: 'Dave Pinchin' Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: Humphreys Pnuematic valves. Date: Thu, 15 Jul 1999 13:04:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" [Craig Pearce] Humphreys valves are not the best. We tend to replace them with another brand as they fail. One reason is that the new valve bases allow you to operate the valve without electrical input. This is very helpful if the machine is turned off. Craig Pearce Technical Officer Medical Physics and Clinical Engineering Auckland Healthcare Services Ltd Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Humphreys Pnuematic valves. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Humphreys Pnuematic valves. Date: Thu, 15 Jul 1999 12:21:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day all, Steve Kloster mentioned about faulty pneumatic valves and asked for any thoughts. I have some (sometimes they get lonely and go away though). We have had lots of trouble with the humphreys valves where the plungers fail to seal the holes. I suppose it is radiation hardening of the seats. The usual symptom is the pneumatic ram gets sluggish and the valve exhausts air while the ram is NOT in motion. We have replaced these with a functional equivalent which lasts much longer. (I havn't lost one yet). The old humphreys lasted anything from 3 months to 3 years. PS our new 2100 was delivered with different valves. Dave, ************************************************** Life is pain..... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: CL2100C ENERGY SWITCH PROBLEM Message-ID: <990715105955IH.14597@www4.iname.net> From: fmertes@email.com To: hskang1@samsung.co.kr Cc: linac-eng Subject: Re: CL2100C ENERGY SWITCH PROBLEM Date: Thu, 15 Jul 1999 06:59:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Check the air cylinder also. I had an air cylinder leak at the shaft in the HI X mode (your 10 X mode). You can either replace the air cylinder or rebuild it by cleaning out the cylinder and replacing the O-ring on the ram and one in the housing where the shaft comes out. Grease the o-rings with a good grade of o-ring grease. I do not think it is your energy switch. just the pneumatic system. ---- On Jul 14 hskang1@samsung.co.kr wrote: > SUBJECT : ENERGY SWITCH FAULT > > This is Samsung medical center in South Korea. > Our machine is Varian CL2100C and Serial number is 612. > My machine is normal situation in 6X but energy switch fault break out > in 10X. Problem is energy switch isn't fully pull out in 10X. As far as I know that I have to exchange energy switch > but cost of exchange is very expensive to me. I would like to know the other way to fix energy switch fault. > Frank Mertes Divine Providence Hospital 1100 Grampian Blvd. Williamsport, Pa 17701 Phone:(570) 326-8000 Fax: (570) 326-8264 ----------------------------------------------- FREE! The World's Best Email Address @email.com Reserve your name now at http://www.email.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: YLD faults - revisited Message-ID: <199907151314.OAA11961@mkoc.demon.co.uk> From: dfenn@mkoc.demon.co.uk To: linac-eng@plato1.aristotle.net Subject: Re: YLD faults - revisited Date: Thu, 15 Jul 1999 05:14:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I agree with all of you. We tried a couple of the National valves here last year, (because they were cheaper than EEV) and both failed after a few months. I had some dialogue, via this forum, with the guys from National, but as I recall they could not give me a life time statement. So it was back to EEV for us. Perhaps National would like to defend their corner and give us some hard facts? David Fenn Mid Kent Oncology Centre MAIDSTONE Kent ME16 9QQ UK -------- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Energy Switch Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6CFE@radoncnt1.fccc.edu> From: "Barnes, Bill" To: "'hskang1@samsung.co.kr'" , linac-eng@plato1.aristotle.net Subject: Energy Switch Date: Thu, 15 Jul 1999 04:46:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, I would suggest that you try disconnecting the Air drive to the Energy Switch, then try manually moving the Energy Switch's Plunger. If the plunger moves freely, then I would look at the air system. If the plunger is sticking in a certain place, or is rough as it moves, then I would replace the Energy Switch. I have used a very small amount of Super Lube on the the Energy Switch's plunger shaft, it has worked very well in some cases. Good Luck. Bill Barnes, BSEE Bio Engineer Fox Chase Cancer Philadelphia, Pa 215-728-2997 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: CL2100C ENERGY SWITCH PROBLEM Message-ID: From: "Kloster, Stephen" To: "'hskang1@samsung.co.kr'" , linac-eng@plato1.aristotle.net Subject: RE: CL2100C ENERGY SWITCH PROBLEM Date: Thu, 15 Jul 1999 04:21:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would first suspect the pneumatic system driving the energy switch. We recently had this problem on our 2100C s/n 638. Find the four way solenoid valve which feeds the energy switch and notice that one of the valve's ports has a plug with a very small hole. Make sure this hole is not plugged with debris. Also check that the in-line filter is not plugged. You can try to adjust the needle valves, but if your energy switch won't pull out at all, this will probably not help. The final thing to suspect is the valve itself. You can test this by removing the plug with the small hole from the solenoid valve's exhaust port. If the energy switch now moves freely, you need to replace the solenoid valve. I have also had the pneumatic valve driving the target slider on this machine fail in this way. Perhaps there was a bad batch of valves, or this may be it's normal life expectancy.(5 years) Anyone on the list know ? Good luck with your problem. Regards, Steve Kloster Electronics Technologist Kingston Regional Cancer Centre Kingston, Ontario -----Original Message----- From: hskang1@samsung.co.kr [mailto:hskang1@samsung.co.kr] Sent: Wednesday, July 14, 1999 7:40 PM To: linac-eng@plato1.aristotle.net Subject: CL2100C ENERGY SWITCH PROBLEM SUBJECT : ENERGY SWITCH FAULT This is Samsung medical center in South Korea. Our machine is Varian CL2100C and Serial number is 612. My machine is normal situation in 6X but energy switch fault break out in 10X. Problem is energy switch isn't fully pull out in 10X. As far as I know that I have to exchange energy switch but cost of exchange is very expensive to me. I would like to know the other way to fix energy switch fault. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: CL2100C ENERGY SWITCH PROBLEM Message-ID: <852567AF.00432CFF.00@mail.lrcc.on.ca> From: Bob Tonks To: hskang1@samsung.co.kr, linac-eng@plato1.aristotle.net Subject: Re: CL2100C ENERGY SWITCH PROBLEM Date: Thu, 15 Jul 1999 04:13:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Before changing the energy switch I would check that the air pressure to the air ram is OK. If the humprey valve is leaking you may not get enough pressure to the ram to pull out the energy switch. These valves do go bad and we keep a stock of them, we have found that if your facility air is at all wet the humphrey valves will fail. Hope this is all it is, Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Aerotech trips Message-ID: <99Jul15.081503bst.11743@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: Linac-Eng@plato1.aristotle.net Subject: Aerotech trips Date: Wed, 14 Jul 1999 23:16:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, We had a similar problem on our 600C with a tripping Aerotech controller. It turned out that the contactor/relay that switches the output of the Servo Controller to the motor - K17 couch, K18 gantry (for 600C) had bad contacts or loose terminals. Swapping the contactor solved the problem. Those contactors are subject some vibration and are mounted on rubber stand-offs. (or at least they should be!) Worth checking. Chris Forrest Cookridge Hospital Leeds U.K. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: YLD Faults - Revisited Message-ID: <000d01bece6d$f30068c0$75a199d1@default> From: "Jeffrey L. Cressman" To: linac-eng Subject: Re: YLD Faults - Revisited Date: Wed, 14 Jul 1999 18:58:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I too have always used EEV thyratrons because of their reliability. I also specify when ordering a new thyratron that it has to have been manufactured within the last 6 months. They can get "Gasy" just setting on the shelf. EEV Thyratrons have a date code printed on them showing year & week of manufacture. The date code is located on the metal base directly bellow the CX1159 designation. An example would be 9912 , this would indicate the tube was manufactured in 1999 during the 22nd week. Richardson Electronics has always given me what I've requested. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: CL2100C ENERGY SWITCH PROBLEM Message-ID: From: hskang1@samsung.co.kr To: linac-eng@plato1.aristotle.net Subject: CL2100C ENERGY SWITCH PROBLEM Date: Wed, 14 Jul 1999 15:39:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" SUBJECT : ENERGY SWITCH FAULT This is Samsung medical center in South Korea. Our machine is Varian CL2100C and Serial number is 612. My machine is normal situation in 6X but energy switch fault break out in 10X. Problem is energy switch isn't fully pull out in 10X. As far as I know that I have to exchange energy switch but cost of exchange is very expensive to me. I would like to know the other way to fix energy switch fault. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Aerotech controllers Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Aerotech controllers Date: Wed, 14 Jul 1999 13:36:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day all, We have an anoying little problem with our gantry aerotech board (Varian 2100C #40). What happens is, about once per day the 'trip' light lights and gantry/couch movements stop. The motor, cables, settings, measured currents etc look OK. Does anybody have any experience in this area????? Thanks, Dave. ************************************************** Life is pain..... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: YLD Faults - Revisited Message-ID: From: Craig Pearce To: "'edwardry@CancerBoard.ab.ca'" Cc: 'linac eng' Subject: RE: YLD Faults - Revisited Date: Wed, 14 Jul 1999 11:45:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have found the National brand to be O K having used only one without problems. Do not buy cheap Chinese ones as they can course your modulator to smoke!!!! Overall I would use the EEV product as they seem to have been the best. Litton are soon to release a ceramic version of the CX1159 and I for one would be interested to see how this device will perform in the Linac application. Craig Pearce Technical Officer Medical Physics and Clinical Engineering Auckland Healthcare Services Ltd Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz > -----Original Message----- > From: Edward Rymes [SMTP:edwardry@CancerBoard.ab.ca] > Sent: Wednesday, 14 July 1999 03:19 > To: linac-eng@plato1.aristotle.net > Subject: YLD Faults - Revisited > > > 1. A month and a half ago the original thyratron lost > filaments after a long career( an EEV). It was replaced by a National > brand CX1159 that shorted after two weeks. Another National was > installed and as I said above was pulled yesterday. Are all tube not > created equal or did I get a bad batch? > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: YLD Faults - Revisited Message-ID: <199907140421.XAA18673@ares.flash.net> From: Thomas McCausland Reply-To: acceltek@flash.net To: linac-eng@plato1.aristotle.net Subject: Re: YLD Faults - Revisited Date: Tue, 13 Jul 1999 20:21:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ------------------Snip-------------- > 1. A month and a half ago the original thyratron lost > filaments after a long career( an EEV). It was replaced by a National > brand CX1159 that shorted after two weeks. Another National was > installed and as I said above was pulled yesterday. Are all tube not > created equal or did I get a bad batch? > 2. If it isn't the tubes, what is causing this CL600c to eat > thyratrons? The pulse cable is the newer style and about 3 - 4 years > old and the Magi seems to be working ok. Do I have a mismatch? How > would I look for it? > 3. As it is our only 600c I can't compare it with another but > I noticed that when the beam was turned off the PFN waveform took a > long time to return to zero(like about 10 - 20 seconds). I don't > recall this before but maybe I didn't notice or is this a clue? > > Any incite would be appreciated 8-} > ---------------------- > Ed Rymes > Technical Equipment Officer > Dept. of Medical Physics > Tom Baker Cancer Centre > 1331 - 29 Street, N.W. > Calgary,AB, T2N 4N2 > 403-670-1791, fax 670-2327 > edwardry@cancerboard.ab.ca > > Dear Ed, Over the years I've been tempted to purchase National CX1159's, but I had always heard storys that seem to match yours, ie... 'I finally found a national that worked in my XYZ accelerator, but it took 5 trys' I'd stick with EEV. I've never had a dud EEV thyratron out of the box. (magnetrons are a different matter ) Good luck Thomas W. McCausland AccelTek Inc. 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: YLD Faults - Revisited Message-ID: From: Edward Rymes Reply-To: edwardry@CancerBoard.ab.ca To: linac-eng@plato1.aristotle.net Subject: YLD Faults - Revisited Date: Tue, 13 Jul 1999 07:19:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings Fellow Eng types.. Checking back in my old linac-eng files I noticed that the tale I'm about to tell you has an oddly familiar ring to it( see last August). I have a CL600c s/n 13 ( say no more, say no more) that started giving YLD faults on the first beam or so during morning warm-up. As is the usual case, when I got to it it was warm and running smoothly. Naturally, as time progressed it got worse until they couldn't run any beam and I got the machine. After trying to tune the yld board, check the AFC cct, I noticed that the PFN and HVPSI were going down the toilet... I wasn't DQing all the time, the PFN intermittently wasn't rising to it's peak level and also not discharging down past zero. After making sure the PFN levels weren't caused by the YLD/AFC boards out front and the Trigger Pulse and DQing Amp in the modulator I went for the obvious choice and changed the Main Thyratron (CX1159).So why did I not replace the thyratron sooner? " It can't be that... I just put it in last month so it must be good!" This leads me to a few questions that I'm sure this list will have something to say: 1. A month and a half ago the original thyratron lost filaments after a long career( an EEV). It was replaced by a National brand CX1159 that shorted after two weeks. Another National was installed and as I said above was pulled yesterday. Are all tube not created equal or did I get a bad batch? 2. If it isn't the tubes, what is causing this CL600c to eat thyratrons? The pulse cable is the newer style and about 3 - 4 years old and the Magi seems to be working ok. Do I have a mismatch? How would I look for it? 3. As it is our only 600c I can't compare it with another but I noticed that when the beam was turned off the PFN waveform took a long time to return to zero(like about 10 - 20 seconds). I don't recall this before but maybe I didn't notice or is this a clue? Any incite would be appreciated 8-} ---------------------- Ed Rymes Technical Equipment Officer Dept. of Medical Physics Tom Baker Cancer Centre 1331 - 29 Street, N.W. Calgary,AB, T2N 4N2 403-670-1791, fax 670-2327 edwardry@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Used Clinac 1800S Message-ID: <199907122255.RAA00096@aeneas.net> From: Guy Turner To: Linac List Server Subject: Used Clinac 1800S Date: Mon, 12 Jul 1999 14:23:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My center is planning on decommissioning our Clinac 1800 later this year. Clinac 1800S Serial Number 040 came out of warranty in 1986. The 'S' in the model designation means that it is a single photon energy unit. It has 10X photons with 6MV port film. The electron energies are 6,9,12,15 and 18 Mev. It has a PSA-style couch that had all of the bearings replaced in 1997. No beamstopper. Any interested parties can contact me via telephone for further details. My direct line is (901)425-6247. Guy Turner Enterprise Network Project Manager Radiotherapy Service Engineer West Tennessee Healthcare ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: New linac reliabilities Message-ID: <4.1.19990712101501.009327f0@radonc17.ucsf.edu> From: John Somers To: linac-eng@plato1.aristotle.net, John.Byrne@newcastle.ac.uk Subject: Re: New linac reliabilities Date: Mon, 12 Jul 1999 06:41:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 11:38 AM 7/8/99 +0100, you wrote: >Dear all, > >We are about to purchase 2 new linacs. As well as the many, many, many >other questions we have looked at in narrowing our choice of linac we are >interested in the following: > >Since a lot of the technology/engineering/software which comes with the >most up-to-date Siemens, Varian, and lets add Elekta, is RELATIVELY new, >has it reached a point of stability in terms of reliablity? E.g. Does >IMRT/step+shoot really work every time? Do the EDW/Virtual wedge have >teething problems etc, etc? > >How do the reliabilities of the new technologies compare? > >Thanks for any answers >John > John, the Siemens step/shoot IMRT is in clinical use here at Univ. of California-San Francisco. It works consistently and efficiently under Primeview, the Siemens graphical user interface. All current IMRT approaches use lots more radiation than previously to deliver a given tumor dose since most of the radiation of each field segment is blocked by the MLC. This means more high voltage on-time, more intensive use of the RF system, and more need for certain preventive maintenance related to radiation damage to target water hoses and a few other components in the head. So far as I know this would not be significantly different for the other manufacturers, except for the Elekta MLC camera. One major critical function for auto-sequencing, IMRT, and EDW/Virtual Wedge is data transfer from Patient database to machine controllers, including the MLC. All data handling functions are at a higher order of magnitude for these types of treatments. In this clinic LANTIS does this pretty efficiently and reliably. VARIS here tends to lock up several times daily and takes too long to clear and reenable. I recommend getting some pretty solid demonstrations of this function at clinical sites from each manufacturer before you buy into any of their promises. Good luck. John Somers ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: KD-2 Modulator Message-ID: <9907060101.AB19144@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Subject: RE: KD-2 Modulator Date: Mon, 5 Jul 1999 16:43:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank you everybody who replied to my enquiry. After the diodes were replaced last time the machine is working properly though we decided to add one more diode in the stack in the case we had some reverse overvoltage spikes. Yesterday we observed available modulator wave forms. We noticed some spikes on PFN-E at the moment when the tetrode is closing. But they definitely do not go higher than maximum PFN voltage at the end of the charge.All other waveforms were OK. Thus it is still unknown what caused this diodes to blow up three times. By the way I do not understand how a faulty tetrode can destroy them as maximum input voltage is only about 20 kV. Also I would like to find out whether they blown up because of excessive reverse voltage (must be over 45 kV) or direct current ( average must exceed 1.4 A). Regards, A Frolov Manager, Radiation Engineering RAH Medical Physics Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@cancer.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Beam off - no reason Message-ID: From: Steve Reliford To: linac-eng@plato1.aristotle.net, CCCHM@qe2-hsc.ns.ca Subject: Re: Beam off - no reason Date: Fri, 2 Jul 1999 06:55:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The ole BONR problem. There were a series of Dedicated Keyboard control boards that were missing a cap on the "Beam Off " line. I believe that it was control boards 01103245-01 rev A. Verify the correct chip against your data book, but add a .1 mf 50v cap across the signal line and ground. Look at U10 pins 8 and 19. The Varian STB for this was CN095, PN863580. Good Luck, Steve >>> Carl Murphy 07/02/99 05:41AM >>> Hi Folks: Have a 600C S/N 311 which sometimes shuts the beam off before the end of treatment with no reason or interlock. Checked the event log. Nothing was generated. I figure this is something noise induced because it is a "noisy" machine. Has anyone seen this problem before? Any help is appreciated. Thanks in advance. Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Beam off - no reason Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Beam off - no reason Date: Fri, 2 Jul 1999 04:41:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks: Have a 600C S/N 311 which sometimes shuts the beam off before the end of treatment with no reason or interlock. Checked the event log. Nothing was generated. I figure this is something noise induced because it is a "noisy" machine. Has anyone seen this problem before? Any help is appreciated. Thanks in advance. Carl Murphy Electronics Engineering Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre Halifax, Nova Scotia Canada phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: KD2 modulator Message-ID: <9907020118.AA17408@yoyo.rah.sa.gov.au> From: Andrew Frolov To: linac-eng@plato1.aristotle.net Subject: KD2 modulator Date: Thu, 1 Jul 1999 16:59:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi everyone, We have got a troublesome Mevatron KD2 that will never let us go out to the street. Now we have a recurring fault in modulator. Reverse current diodes CR7 on the output of tetrode blown up three times over past couple of months(two times yesterday). Inbetween the machine appears to work properly. Has anybody got an idea what causes this diodes to go. I will appreciate any suggestions. Regards, A Frolov Manager, Radiation Engineering RAH Medical Physics Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@cancer.rah.sa.gov.au ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch drift Message-ID: From: Doug Tymofichuk Reply-To: dougt@CancerBoard.ab.ca To: S Thiesson Cc: Linac eng Subject: Re: ETR couch drift Date: Wed, 30 Jun 1999 12:19:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On Wed, 30 Jun 1999 14:04:55 -0600 S Thiesson wrote: > > Hmmm...yes it sounds like the new system is easier to maintain. > Here's another thought I had when thinking about re-installation of the > drive. > Somewhere, possibly in the heads of the factory boys...would they be > listening...there must reside some specification regarding pressure > exerted on the motor drive assembly. In other words I'm betting the full > weight of the couch is not carried on the drive unit...no? > How do they set this up at installation time? The motor drive assembly supports 1/2 of the weight of the couch. The other half is supported by a steel idler wheel on the other side of the toe assembly. It is basically just a two point support, with the center pit bearing holding it all together. Therefore, there are no specifications or set-up procedures; the couch is just lowered on to the two wheels. ---------------------- Doug Tymofichuk dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch drift Message-ID: <377A7867.D489A883@scf.sk.ca> From: S Thiesson To: dougt@CancerBoard.ab.ca, Linac eng Subject: Re: ETR couch drift Date: Wed, 30 Jun 1999 12:04:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hmmm...yes it sounds like the new system is easier to maintain. Here's another thought I had when thinking about re-installation of the drive. Somewhere, possibly in the heads of the factory boys...would they be listening...there must reside some specification regarding pressure exerted on the motor drive assembly. In other words I'm betting the full weight of the couch is not carried on the drive unit...no? How do they set this up at installation time? Doug Tymofichuk wrote: On Wed, 30 Jun 1999 14:23:33 -0400 Steve Nelson wrote: > Scot, > The drive wheel is steel and doesn't have a flat > spot. We are installing a 600C with the new couch base and > ring. So far I'm not impressed. What is it that you are not impressed with? We have had a total of five different VEO baseframes in use here at different times, and other than one noisy motor gearbox, they have all been 100% reliable. They get regular maintenance, and that seems to be all that's required. They are certainly MUCH easier to service than the old style, you don't need a crane or any heavy lifting equipment, and compared to the VEO system, our older style baseframes have TERRIBLE reliability, with brake, gearbox, and readout pot failures galore. ---------------------- Doug Tymofichuk dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: RE: ETR couch drift Message-ID: From: Doug Tymofichuk Reply-To: dougt@CancerBoard.ab.ca To: Steve Nelson Cc: 'Linac Engineers' Subject: Re: RE: ETR couch drift Date: Wed, 30 Jun 1999 11:34:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On Wed, 30 Jun 1999 14:23:33 -0400 Steve Nelson wrote: > Scot, > The drive wheel is steel and doesn't have a flat > spot. We are installing a 600C with the new couch base and > ring. So far I'm not impressed. What is it that you are not impressed with? We have had a total of five different VEO baseframes in use here at different times, and other than one noisy motor gearbox, they have all been 100% reliable. They get regular maintenance, and that seems to be all that's required. They are certainly MUCH easier to service than the old style, you don't need a crane or any heavy lifting equipment, and compared to the VEO system, our older style baseframes have TERRIBLE reliability, with brake, gearbox, and readout pot failures galore. ---------------------- Doug Tymofichuk dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: ETR couch drift Message-ID: From: Steve Nelson To: 'Linac Engineers' Subject: RE: ETR couch drift Date: Wed, 30 Jun 1999 10:23:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Scot, The drive wheel is steel and doesn't have a flat spot. We are installing a 600C with the new couch base and ring. So far I'm not impressed. I will perform your test when we get power to the unit and lasers mounted. regards, stephen > -----Original Message----- > From: S Thiesson [SMTP:sthiesson@scf.sk.ca] > Sent: Wednesday, June 30, 1999 11:43 AM > To: Linac eng > Subject: ETR couch drift > > > Very appropriate thread today. We are also experiencing about a 1mm drop > in couch height, but it occurs after the bed floor angle has been > rotated and then brought back to zero. I always assumed this was > mechanical settling of the lift mechanism and not a problem. Has anyone > else done this test? Put about 150lbs of weight on the bed, line up the > top with the lateral laser, rotate the floor angle through its full > range, measure the drop of the top at the laser again. On the first > rotation we consistently get a drop of about a mm, after the initial > drop there is no further drift. > This brings up another question for me though. Our angle drive is a bit > jerky and I was looking at a way to remove the drive unit the other day. > It appears as though one Allan screw is all that holds the unit in > place. It also appears that a rubber wheel is what is used to drive the > bed, but I can't tell from the mechanical drawings and I can't locate a > decent parts breakdown for the unit. Has anybody removed this drive > before, and are parts available for the unit. I assume our jerky > rotation is a result of the rubber wheel becoming flat in the 'zero' > spot. > > Scot Thiesson > Allan Blair Cancer Centre > Regina Sask. Canada > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch drift Message-ID: From: Doug Tymofichuk Reply-To: dougt@CancerBoard.ab.ca To: S Thiesson Cc: Linac eng Subject: Re: ETR couch drift Date: Wed, 30 Jun 1999 09:01:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On Wed, 30 Jun 1999 09:43:17 -0600 S Thiesson wrote: This brings up another question for me though. Our > angle drive is a bit jerky and I was looking at a way to > remove the drive unit the other day. It appears as though > one Allan screw is all that holds the unit in place. It > also appears that a rubber wheel is what is used to drive > the bed, but I can't tell from the mechanical drawings and > I can't locate a decent parts breakdown for the unit. I assume that you are referring to a VEO baseframe, not the older type where you have to use a crane to pull the pit. The procedure for removing the drive motor is to first take the load off of the motor by tightening down the two allen screws, one on each side of the lower toe area. (just above the circular rail that the bearings travel on when rotating) These push down on a couple of 1" round felt pads, which raise the couch up off of the drive wheel. Then loosen the set screw on the motor itself and pull it out. If you have a rubber wheel on yours, that must be something new. Of five mechanisms that I have seen, they all have a steel drive wheel. If it is greasy dirty, maybe it just looks like rubber. On the other side from the motor there is another steel wheel to support the couch. You may want to remove and clean this as well. Has > anybody removed this drive before, and are parts available > for the unit. I assume our jerky rotation is a result of > the rubber wheel becoming flat in the 'zero' spot. I have removed these a number of times and I doubt that the steel wheel has developed a flat spot. I have never ordered spares, but do have some spare parts that I salvaged, including a motor and drive wheel, from when we moved a linac and had to install a whole new baseframe. Contact me if you require further assistance. ---------------------- Doug Tymofichuk dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: ETR couch drift Message-ID: <377A3B15.DA13014E@scf.sk.ca> From: S Thiesson To: Linac eng Subject: ETR couch drift Date: Wed, 30 Jun 1999 07:43:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Very appropriate thread today. We are also experiencing about a 1mm drop in couch height, but it occurs after the bed floor angle has been rotated and then brought back to zero. I always assumed this was mechanical settling of the lift mechanism and not a problem. Has anyone else done this test? Put about 150lbs of weight on the bed, line up the top with the lateral laser, rotate the floor angle through its full range, measure the drop of the top at the laser again. On the first rotation we consistently get a drop of about a mm, after the initial drop there is no further drift. This brings up another question for me though. Our angle drive is a bit jerky and I was looking at a way to remove the drive unit the other day. It appears as though one Allan screw is all that holds the unit in place. It also appears that a rubber wheel is what is used to drive the bed, but I can't tell from the mechanical drawings and I can't locate a decent parts breakdown for the unit. Has anybody removed this drive before, and are parts available for the unit. I assume our jerky rotation is a result of the rubber wheel becoming flat in the 'zero' spot. Scot Thiesson Allan Blair Cancer Centre Regina Sask. Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch drift Message-ID: <00087F0F.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: Linac eng , tcullen@wfubmc.edu Subject: Re: ETR couch drift Date: Wed, 30 Jun 1999 08:05:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tim, First of all if you're not getting through to anyone at Varian for help with this problem you're not talking to the right people. Talk to the district manager of your district and if that doesn't help then feel free to call Milpitas and talk to Doug Cook. I'm quite sure you'll get a response. On to the problem. As I understand it the design of the ETR is such that with absolutely no power there will be no downward "drift" of the couch so, without actually seeing the problem, I would rule at the lead screw. Try to determine when the drifting is occuring. Is it happening when there is a motion enable? If it is, which is likely the case, then you should check the set up of the drivers. I've had cases where the driver is not zeroed perfectly and when the motion enable bars are pulled the couch will drift. And, depending on which way it's not zeroed, it will either drift up or down. Hope this helps! Kerry Price Lutheran General Hospital Park Ridge, IL ______________________________ Reply Separator _________________________________ Subject: ETR couch drift Author: tcullen@wfubmc.edu (Tim Cullen) at PO_EXTERNET Date: 6/30/99 3:45 AM I've got a problem with a slight amount of couch drift in the down direction and it is with no signal and the servo modules all appear to be set up properly, so I'm assuming this is mechanical. Varian is relying on the fine thread of this lead screw it appears to hold position. Have any of you guys had this problem and if so what did you do about it. I tried to get in touch with someone at the Varian empire but could not get through. Thanks in advance ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch drift Message-ID: <6aed4463.24ab8170@aol.com> From: Radsrus@aol.com To: tcullen@wfubmc.edu, linac-eng@plato1.aristotle.net Subject: Re: ETR couch drift Date: Wed, 30 Jun 1999 06:19:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tim, you may be having that uncommanded drift problem due to too much grease in the lift actuator. One remedy may be to flush the housing with mineral spirits then reapplying a small amount of lube. The other remedy is, if the problem is not electrical as others have suggested, is to replace the bearings in the lift actuator (not an easy task) or the lift actuator itself. Quick test - after treatment, put couch top at iso & disconnect the lift motor power connector - Add some weight to the top, wait an hour or 2, If the couch drifts down, chances are the pressure bearings in the lift actuator are slipping due to wear or overgreasing. GL, sschwarz@acceletronics.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch drift Message-ID: <377A1564.E51D7377@yale.edu> From: "Peter E. Vitali" To: Tim Cullen Cc: Linac eng Subject: Re: ETR couch drift Date: Wed, 30 Jun 1999 05:02:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Tim: Last time we saw that problem was 7 years ago. Turn out to be the zero for one of the drive amplifiers was slightly out. It would only show up when the Motion Enable Bars are pressed for another motion. Ours was very gradual, 1mm in about 30 seconds of MEB being pressed. We picked it up during a sterotatic procedure on the e RMS 2000. I would say you want to be less than 0.010 Vdc and if possible 0.00. We put a piece of tape on the motor shaft and watched it turn ever so slowly. Made an adjustment to the Aeroteck Bd. Initially it was -20.6mv and we adjusted it to 0.000. Haven't noticed the problem since. Pete Vitali ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/x-vcard; name="peter.vitali.vcf" Content-Disposition: attachment; filename="peter.vitali.vcf" Content-Description: Card for Peter E. Vitali begin:vcard n:Vitali;Peter E. tel;fax:(203) 688-3663 tel;work:(203) 688-2948 x-mozilla-html:FALSE org:Yale-New Haven Hospital;Radiation Physics version:2.1 email;internet:peter.vitali@yale.edu title:Therapeutic Radiological Engineer adr;quoted-printable:;;Hunter Building=0D=0A15 York Street;New Haven;Ct;06504;USA x-mozilla-cpt:;1 fn:Peter E. Vitali end:vcard ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: ETR couch drift Message-ID: <3779D91F.719C282B@wfubmc.edu> From: tcullen@wfubmc.edu To: Linac eng Subject: ETR couch drift Date: Wed, 30 Jun 1999 00:45:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I've got a problem with a slight amount of couch drift in the down direction and it is with no signal and the servo modules all appear to be set up properly, so I'm assuming this is mechanical. Varian is relying on the fine thread of this lead screw it appears to hold position. Have any of you guys had this problem and if so what did you do about it. I tried to get in touch with someone at the Varian empire but could not get through. Thanks in advance ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian's accessory controllers. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Varian's accessory controllers. Date: Tue, 29 Jun 1999 14:37:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day all, Or perhaps it's not that good........... We had a problem this morning with the Parvus box on 2100 #40. It crashed......... Has anyone any experience of this???? What are the symptoms?????? Thanks Dave. DaveP. ************************************************** Life is pain,...... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 2100 C multi faults : correction about fieldlight Message-ID: <000301bebdbd$9cd49a40$69a199d1@default> From: "Jeffrey L. Cressman" To: linac-eng Subject: RE: 2100 C multi faults : correction about fieldlight Date: Wed, 23 Jun 1999 13:16:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I need to correct the statements I made about the effect of MODE UP on the operation of the field light on my 2300C/D. Upon testing I discovered, the field light remains ON during MODE UP, but it is triggered off by rotating the key sw to the ENABLE position. This however does NOT prevent you from turning the field light back on. Interesting enough rotating the key sw to either position ( ENABLE or DISABLE ) will cause the field light in most cases to be triggered off. Today I done some initial tracing of the field light circuit. It appears electrically to originate from the DIGITAL I/O #1 PCB. This would then lead one to believe it is a wholy software controlled function. I have only tested this function after executing a completed MODE UP. If the oportunity presents itself, I will check the field light function after a failed CAL CHECK cycle. I appologize for the disinformation, sorry Jeff Cressman ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Ximatron intermittents. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Re: Ximatron intermittents. Date: Wed, 23 Jun 1999 11:53:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Success...... The fault cropped up again yesterday while I had the kbd apart so I could do the measurements without moving the kbd. The problem was one of the MEB relays. As a MEB is pressed it closes one of 3 dpst reed relays. One contact is in parallel with the other 2 relays and energises a relay in the stand, The other is checked by the micro which sends out a serial code. The micro contact was intermittently hanging CLOSED. the micro sent the code and the PC noted the relay wasn't energised and up comes the RED screen. Dave.On reboot the PC sends initialisation codes etc to the kbd and expects certain responses. It was receiving the MEB response instead so the PC was reporting "console not responding". Thanks again for all the suggestions. Dave. ************************************************** There's only one sure thing in life, that's doubt.......I think. from - Good bye Pork Pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DS: Ximatron fault Message-ID: <37690C10.F1797A69@scf.sk.ca> From: S Thiesson To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: Re: DS: Ximatron fault Date: Thu, 17 Jun 1999 06:54:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" sorry...that link should be: http://www.comtrol.com/Coperate.htm S Thiesson wrote: > Don't know if you've tried this yet but the com port diagnostics and a lot of > other info is available at > http://www.express-inc.com/index.html > download the diagnostic and if you didn't get a loopback plug they have a how to > at the bottom of this link. > You will have to strap the four port box to be in RS232 mode. > The strapping pinouts are also available on this web site look for the hostess > 550 non intelligent version. > > Regards > Scot Thiesson > Allan Blair Clinic > Regina Sask Canada > > CJ.de.Bruijne@walcheren.ziekenhuis.nl wrote: > > > With flashing console lights the problem also can be a bad joystick. > > The positions of the joysticks are at least tested at power-on. > > If one of the sticks is not in zero-position you get the flashing lights. > > I don't no if this test is repeated during runtime. > > > > By the way, you checked the console-power, Dave? > > Maybe you can log it. > > The 'console not responding' message can point to that. > > Also it can be a bad connection in the comm.loop to the stand. > > Try what happens when you remove the console comm.cable > > from the stand. > > > > Keesjan > > > > > ---------- > > > Van: Richard Kimball[SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > > > Verzonden: woensdag 16 juni 1999 17:48 > > > Aan: 'Dave Pinchin'; linac-eng@plato1.aristotle.net > > > Onderwerp: RE: Ximatron fault > > > > > > Dave, > > > Do all your console lights flash? > > > I have to replace the TL064CN's before on the Console PCB. They are > > > soldered on, but can be removed and replaced. I wouldn't think that heat > > > is > > > your problem. You could also replace the console PCB. If problem goes > > > away, repair old board for spare. I think this board costs about $1,200. > > > > > > Richard L. Kimball > > > > > > G'day, > > >Further to yesterday's posting. The intermittent is still present even with > > the fan > > >cooling the keybd. > > > > > >The prob has two parts. > > >1/ The screen goes red "Motion enable failure" etc. > > >2/ On reboot the PC reports console not responding. > > > > >Dave. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DS: Ximatron fault Message-ID: <37690C10.F1797A69@scf.sk.ca> From: S Thiesson To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: Re: DS: Ximatron fault Date: Thu, 17 Jun 1999 06:54:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" sorry...that link should be: http://www.comtrol.com/Coperate.htm S Thiesson wrote: > Don't know if you've tried this yet but the com port diagnostics and a lot of > other info is available at > http://www.express-inc.com/index.html > download the diagnostic and if you didn't get a loopback plug they have a how to > at the bottom of this link. > You will have to strap the four port box to be in RS232 mode. > The strapping pinouts are also available on this web site look for the hostess > 550 non intelligent version. > > Regards > Scot Thiesson > Allan Blair Clinic > Regina Sask Canada > > CJ.de.Bruijne@walcheren.ziekenhuis.nl wrote: > > > With flashing console lights the problem also can be a bad joystick. > > The positions of the joysticks are at least tested at power-on. > > If one of the sticks is not in zero-position you get the flashing lights. > > I don't no if this test is repeated during runtime. > > > > By the way, you checked the console-power, Dave? > > Maybe you can log it. > > The 'console not responding' message can point to that. > > Also it can be a bad connection in the comm.loop to the stand. > > Try what happens when you remove the console comm.cable > > from the stand. > > > > Keesjan > > > > > ---------- > > > Van: Richard Kimball[SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > > > Verzonden: woensdag 16 juni 1999 17:48 > > > Aan: 'Dave Pinchin'; linac-eng@plato1.aristotle.net > > > Onderwerp: RE: Ximatron fault > > > > > > Dave, > > > Do all your console lights flash? > > > I have to replace the TL064CN's before on the Console PCB. They are > > > soldered on, but can be removed and replaced. I wouldn't think that heat > > > is > > > your problem. You could also replace the console PCB. If problem goes > > > away, repair old board for spare. I think this board costs about $1,200. > > > > > > Richard L. Kimball > > > > > > G'day, > > >Further to yesterday's posting. The intermittent is still present even with > > the fan > > >cooling the keybd. > > > > > >The prob has two parts. > > >1/ The screen goes red "Motion enable failure" etc. > > >2/ On reboot the PC reports console not responding. > > > > >Dave. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DS: Ximatron fault Message-ID: <3769040F.57E77B83@scf.sk.ca> From: S Thiesson To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: DS: Ximatron fault Date: Thu, 17 Jun 1999 06:19:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Don't know if you've tried this yet but the com port diagnostics and a lot of other info is available at http://www.express-inc.com/index.html download the diagnostic and if you didn't get a loopback plug they have a how to at the bottom of this link. You will have to strap the four port box to be in RS232 mode. The strapping pinouts are also available on this web site look for the hostess 550 non intelligent version. Regards Scot Thiesson Allan Blair Clinic Regina Sask Canada CJ.de.Bruijne@walcheren.ziekenhuis.nl wrote: > With flashing console lights the problem also can be a bad joystick. > The positions of the joysticks are at least tested at power-on. > If one of the sticks is not in zero-position you get the flashing lights. > I don't no if this test is repeated during runtime. > > By the way, you checked the console-power, Dave? > Maybe you can log it. > The 'console not responding' message can point to that. > Also it can be a bad connection in the comm.loop to the stand. > Try what happens when you remove the console comm.cable > from the stand. > > Keesjan > > > ---------- > > Van: Richard Kimball[SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > > Verzonden: woensdag 16 juni 1999 17:48 > > Aan: 'Dave Pinchin'; linac-eng@plato1.aristotle.net > > Onderwerp: RE: Ximatron fault > > > > Dave, > > Do all your console lights flash? > > I have to replace the TL064CN's before on the Console PCB. They are > > soldered on, but can be removed and replaced. I wouldn't think that heat > > is > > your problem. You could also replace the console PCB. If problem goes > > away, repair old board for spare. I think this board costs about $1,200. > > > > Richard L. Kimball > > > > G'day, > >Further to yesterday's posting. The intermittent is still present even with > the fan > >cooling the keybd. > > > >The prob has two parts. > >1/ The screen goes red "Motion enable failure" etc. > >2/ On reboot the PC reports console not responding. > > >Dave. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DS: Ximatron fault Message-ID: <3769040F.57E77B83@scf.sk.ca> From: S Thiesson To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: DS: Ximatron fault Date: Thu, 17 Jun 1999 06:19:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Don't know if you've tried this yet but the com port diagnostics and a lot of other info is available at http://www.express-inc.com/index.html download the diagnostic and if you didn't get a loopback plug they have a how to at the bottom of this link. You will have to strap the four port box to be in RS232 mode. The strapping pinouts are also available on this web site look for the hostess 550 non intelligent version. Regards Scot Thiesson Allan Blair Clinic Regina Sask Canada CJ.de.Bruijne@walcheren.ziekenhuis.nl wrote: > With flashing console lights the problem also can be a bad joystick. > The positions of the joysticks are at least tested at power-on. > If one of the sticks is not in zero-position you get the flashing lights. > I don't no if this test is repeated during runtime. > > By the way, you checked the console-power, Dave? > Maybe you can log it. > The 'console not responding' message can point to that. > Also it can be a bad connection in the comm.loop to the stand. > Try what happens when you remove the console comm.cable > from the stand. > > Keesjan > > > ---------- > > Van: Richard Kimball[SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > > Verzonden: woensdag 16 juni 1999 17:48 > > Aan: 'Dave Pinchin'; linac-eng@plato1.aristotle.net > > Onderwerp: RE: Ximatron fault > > > > Dave, > > Do all your console lights flash? > > I have to replace the TL064CN's before on the Console PCB. They are > > soldered on, but can be removed and replaced. I wouldn't think that heat > > is > > your problem. You could also replace the console PCB. If problem goes > > away, repair old board for spare. I think this board costs about $1,200. > > > > Richard L. Kimball > > > > G'day, > >Further to yesterday's posting. The intermittent is still present even with > the fan > >cooling the keybd. > > > >The prob has two parts. > >1/ The screen goes red "Motion enable failure" etc. > >2/ On reboot the PC reports console not responding. > > >Dave. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DS: Ximatron fault Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: DS: Ximatron fault Date: Wed, 16 Jun 1999 23:37:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" With flashing console lights the problem also can be a bad joystick. The positions of the joysticks are at least tested at power-on. If one of the sticks is not in zero-position you get the flashing lights. I don't no if this test is repeated during runtime. By the way, you checked the console-power, Dave? Maybe you can log it. The 'console not responding' message can point to that. Also it can be a bad connection in the comm.loop to the stand. Try what happens when you remove the console comm.cable from the stand. Keesjan > ---------- > Van: Richard Kimball[SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > Verzonden: woensdag 16 juni 1999 17:48 > Aan: 'Dave Pinchin'; linac-eng@plato1.aristotle.net > Onderwerp: RE: Ximatron fault > > Dave, > Do all your console lights flash? > I have to replace the TL064CN's before on the Console PCB. They are > soldered on, but can be removed and replaced. I wouldn't think that heat > is > your problem. You could also replace the console PCB. If problem goes > away, repair old board for spare. I think this board costs about $1,200. > > Richard L. Kimball > > G'day, >Further to yesterday's posting. The intermittent is still present even with the fan >cooling the keybd. > >The prob has two parts. >1/ The screen goes red "Motion enable failure" etc. >2/ On reboot the PC reports console not responding. >Dave. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DS: Ximatron fault Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: DS: Ximatron fault Date: Wed, 16 Jun 1999 23:37:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" With flashing console lights the problem also can be a bad joystick. The positions of the joysticks are at least tested at power-on. If one of the sticks is not in zero-position you get the flashing lights. I don't no if this test is repeated during runtime. By the way, you checked the console-power, Dave? Maybe you can log it. The 'console not responding' message can point to that. Also it can be a bad connection in the comm.loop to the stand. Try what happens when you remove the console comm.cable from the stand. Keesjan > ---------- > Van: Richard Kimball[SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > Verzonden: woensdag 16 juni 1999 17:48 > Aan: 'Dave Pinchin'; linac-eng@plato1.aristotle.net > Onderwerp: RE: Ximatron fault > > Dave, > Do all your console lights flash? > I have to replace the TL064CN's before on the Console PCB. They are > soldered on, but can be removed and replaced. I wouldn't think that heat > is > your problem. You could also replace the console PCB. If problem goes > away, repair old board for spare. I think this board costs about $1,200. > > Richard L. Kimball > > G'day, >Further to yesterday's posting. The intermittent is still present even with the fan >cooling the keybd. > >The prob has two parts. >1/ The screen goes red "Motion enable failure" etc. >2/ On reboot the PC reports console not responding. >Dave. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Ximatron fault Message-ID: <457B79AC7AB2D211AAAC006097BDA653062481@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: Ximatron fault Date: Wed, 16 Jun 1999 07:48:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, Do all your console lights flash? I have to replace the TL064CN's before on the Console PCB. They are soldered on, but can be removed and replaced. I wouldn't think that heat is your problem. You could also replace the console PCB. If problem goes away, repair old board for spare. I think this board costs about $1,200. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Dave Pinchin [mailto:DaveP@chhlth.govt.nz] Sent: Tuesday, June 15, 1999 5:45 PM To: linac-eng@plato1.aristotle.net Subject: Ximatron fault G'day, Further to yesterday's posting. The intermittent is still present even with the fan cooling the keybd. The prob has two parts. 1/ The screen goes red "Motion enable failure" etc. 2/ On reboot the PC reports console not responding. Everything appears OK. But by the time I have the covers off everything works. Any suggestions. This has been going on now for an extended time but very intermittently, sometimes we have 2 incidents per week sometimes one in 3 months. (I'm about to start tearing out what little hair I have left). Dave. ************************************************** Life is paiin,...... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Ximatron fault Message-ID: <457B79AC7AB2D211AAAC006097BDA653062481@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: Ximatron fault Date: Wed, 16 Jun 1999 07:48:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, Do all your console lights flash? I have to replace the TL064CN's before on the Console PCB. They are soldered on, but can be removed and replaced. I wouldn't think that heat is your problem. You could also replace the console PCB. If problem goes away, repair old board for spare. I think this board costs about $1,200. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Dave Pinchin [mailto:DaveP@chhlth.govt.nz] Sent: Tuesday, June 15, 1999 5:45 PM To: linac-eng@plato1.aristotle.net Subject: Ximatron fault G'day, Further to yesterday's posting. The intermittent is still present even with the fan cooling the keybd. The prob has two parts. 1/ The screen goes red "Motion enable failure" etc. 2/ On reboot the PC reports console not responding. Everything appears OK. But by the time I have the covers off everything works. Any suggestions. This has been going on now for an extended time but very intermittently, sometimes we have 2 incidents per week sometimes one in 3 months. (I'm about to start tearing out what little hair I have left). Dave. ************************************************** Life is paiin,...... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron fault Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Ximatron fault Date: Tue, 15 Jun 1999 14:44:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Further to yesterday's posting. The intermittent is still present even with the fan cooling the keybd. The prob has two parts. 1/ The screen goes red "Motion enable failure" etc. 2/ On reboot the PC reports console not responding. Everything appears OK. But by the time I have the covers off everything works. Any suggestions. This has been going on now for an extended time but very intermittently, sometimes we have 2 incidents per week sometimes one in 3 months. (I'm about to start tearing out what little hair I have left). Dave. ************************************************** Life is paiin,...... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron fault Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Ximatron fault Date: Tue, 15 Jun 1999 14:44:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Further to yesterday's posting. The intermittent is still present even with the fan cooling the keybd. The prob has two parts. 1/ The screen goes red "Motion enable failure" etc. 2/ On reboot the PC reports console not responding. Everything appears OK. But by the time I have the covers off everything works. Any suggestions. This has been going on now for an extended time but very intermittently, sometimes we have 2 incidents per week sometimes one in 3 months. (I'm about to start tearing out what little hair I have left). Dave. ************************************************** Life is paiin,...... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sage Rotary Joint Message-ID: From: Radsrus@aol.com To: "Wilson, Jim" Subject: Re: Sage Rotary Joint Date: Tue, 15 Jun 1999 14:27:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In a message dated 6/15/99 5:18:07 PM Central Daylight Time, JWilson3@providence.org writes: << Subj: RE: Sage Rotary Joint Date: 6/15/99 5:18:07 PM Central Daylight Time From: JWilson3@providence.org (Wilson, Jim) To: Radsrus@aol.com ('Radsrus@aol.com') After contacting Sage directly I was able to determine that the quad ring for our unit is 4.5 X 3/16. I assume there are very few of these around. Thanks for your input. Jim Wilson Clinical Engineering Providence Health Systems >> Jim, That is an oddball - glad you found what you needed. Rgds, Steve Schwarz ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron intermittents Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Ximatron intermittents Date: Mon, 14 Jun 1999 17:30:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have had a troublesome intermittent problem on our Ximatron. The problem would be corrected by my walking near the keyboard. Just to be clever I stuck a temp probe into the keybd while running (just next to the +5v reg.) and noted the inside air temp to be 50 deg C ! ! ! ! ! The vents are on the bottom of the keybd (everybody knows as hot air falls). I have just jammed a fan on one of the vents and dropped the inside temp to 30 deg in a few minutes. Has anybody else noticed this ?????? DaveP. ********************************************************* The smallest hole will empty the largest container unless the hole is for drainage In which case it will block. ********************************************************* ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Questions Message-ID: <19990608182609.46676.qmail@hotmail.com> From: Tareq Ammer To: linac-eng@plato1.aristotle.net Subject: Questions Date: Tue, 8 Jun 1999 10:26:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear List Members; I would like to apologize to you for my questions, but I would appreciate your help. I am preparing for a Board exam in physics and came across these questions and needed some one with experties in the subject to confirm my information. Please feel free to e-mail me privately if you want. Thanks in advance to all of you. Tareqammer@hotmail.com 1- What is the ratio of Photon to Electron current in a Linac? 2- For a shielding in a Linac's Room Door, what do you need to shield against? 3- One mornning, the beam flatness is found off in the cross plane direction, and the cGy/mu is high. What would be the probable cause? 4- What controls the dose rate in a Linac? 5- What would cause a significant change in the dose rate of output of a Linac? 6- What is the difference between a Klystron and a Magnetron? 7- What is needs to be checked after changing a magnetron? 8- What is needs to be checked after changing a wave guide? 9- What is the size of cavity in a wave guide? Regards, Tareq _______________________________________________________________ Get Free Email and Do More On The Web. Visit http://www.msn.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian ver 5.4 Message-ID: <375D12D3.63D46D42@wfubmc.edu> From: Tim Cullen To: Linac eng Subject: Varian ver 5.4 Date: Tue, 8 Jun 1999 04:55:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I recently had a bad spro on Y1 on a 2100CD machine and after setting everything up found that in the calibration screen there were all zeroes in the reference points. We upgraded this machine to ver 5.4 this past month and when you do, the old positions are copied over into a new configuration file. Then you basically compare old to new in the analog screens and if everything matches you move on. I found it odd that there were all zeroes in the Y1 cal screen so I checked the other cal screens and they were all zero also. It seems after talking to a Varian rep that these raw numbers in this cal screen are for the person doing the calibrations' benefit only and the actual reference points used are hex numbers saved in the config file. This being the case it would be beneficial if the varian programmers would remember to put these raw numbers back on the screen so we can benefit from them. My point here, according to Varian, don't freak if after an upgrade you see all zeroes in the cal screen and don't bother to start re-calibrating everything. The numbers are there, just not where you can see them. Comforting ain't it. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Varian 2100C w/PV gantry balance Message-ID: <457B79AC7AB2D211AAAC006097BDA65306246C@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: FW: Varian 2100C w/PV gantry balance Date: Mon, 7 Jun 1999 07:58:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: SMcna39074@aol.com [mailto:SMcna39074@aol.com] Sent: Wednesday, June 02, 1999 11:25 PM To: RKimball@radonc-uc-po.mcis.uchicago.edu Subject: Re: Varian 2100C w/PV gantry balance No this is not normal.. If Varian installed this, they should come back and correct it. I believe that Varian has some additional side mount brackets that can be added to increase the balance weights. 2100 with R-arm should be balanced. Stan at Cancer Foundation of Santa Barbara 805-682-7300. I know that our 2100 with MLC and PV is balanced. Good Luck. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Varian 2100C w/PV gantry balance Message-ID: <457B79AC7AB2D211AAAC006097BDA65306246B@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: FW: Varian 2100C w/PV gantry balance Date: Mon, 7 Jun 1999 07:57:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Paul Twyman [mailto:mawm82@[158.43.128.67]] Sent: Monday, June 07, 1999 11:16 AM To: RKimball@radonc-uc-po.mcis.uchicago.edu Subject: Re: Varian 2100C w/PV gantry balance This sounds familiar. We have a 600C here at Addenbrookes and suffered from exactly this problem. Our PV was installed with some of the thin steel counter weights still in place at the bottom of the gantry and to compensate for this many additional small weights had been added to the top of the gantry. Check that the installation has not been completed with any of the large plates ( behind the PV assy) left in place. If your gantry is that far out of balance you may well suffer from rotational therapy faults. Hope this helps. Paul Twyman Medical Physics Addenbrookes Hosp. Cambridge England Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Varian 2100C w/PV gantry balance Message-ID: <457B79AC7AB2D211AAAC006097BDA65306246E@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: FW: Varian 2100C w/PV gantry balance Date: Mon, 7 Jun 1999 07:58:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Rodger Sabey [mailto:rsabey@bccancer.bc.ca] Sent: Wednesday, June 02, 1999 2:48 PM To: Richard Kimball Subject: RE: Varian 2100C w/PV gantry balance Hello Richard, We were left with the same situation after a retrofitted R-Arm. I drilled and tapped some mounting holes forward of the gun deck, on both sides and added lead there. I monitored gantry motor current as the gantry moved 360 degrees and added lead until the current varied less than 0.5 amps.This corrected autosetup and arc related problems.... Good luck... Rodger Sabey B.C. Cancer Agency ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Varian 2100C w/PV gantry balance -Reply Message-ID: <457B79AC7AB2D211AAAC006097BDA65306246D@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: FW: Varian 2100C w/PV gantry balance -Reply Date: Mon, 7 Jun 1999 07:58:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Dave Pinchin [mailto:DaveP@chhlth.govt.nz] Sent: Wednesday, June 02, 1999 3:32 PM To: RKimball@radonc-uc-po.mcis.uchicago.edu Subject: Varian 2100C w/PV gantry balance -Reply G'day Richard, Our 2100cd w.PV is fine although I seem to remember at instalation the guys were head scratching about how to put extra weight on if the last few blocks diddn't do the trick. Some of the ideas were: lead instead of steel, hollowed out steel weights filled with lead, etc. I'm probably being silly here but .......... How easy is it to pull some steel out of the counterweight ????? Could a steel fabricator laser a slice off??? Those things go through about 2 inch plate so could they do just one plate of the thing ????? Good luck Dave. ************************************************** Life is paiin,....... anyone who says otherwise is selling something. The Dread Pirate Roberts. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Forwarded messages Message-ID: <457B79AC7AB2D211AAAC006097BDA65306246F@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: Forwarded messages Date: Mon, 7 Jun 1999 08:00:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks to all who responded via my plight of gantry unbalance with the Portal Vision. I have forwarded these messages to the list as I feel they are worthy. (Except the suggestion of adding a 30# block to the collimator) :-) Looks like I might be in for some interaction with Varian service to get this resolved. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Xim I.I. Lateral Drive Message-ID: <430e0828.2488957c@aol.com> From: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: Xim I.I. Lateral Drive Date: Thu, 3 Jun 1999 18:35:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, We have a Ximitron C-Series s/n# 773 that is sometimes making a noise from the rear of the Image Intensifier lateral drive motor assembly upon the beginning of its movement. It sounds like a brake of some sort that is dragging, then releasing. There is the small assembly labeled the "tachogenerator" on the rear of the motor made by Thalheim Co. The noise usually goes away after it gets moving. The worm gear shaft is clean and lubed properly with Tri-Flow lubricant. There appears to be no binding as it moves, and no noise as it stops. I can't see any external causes at this point. The motor assembly is made by Simplatroll. Does anyone know if this unit able to make the noise by itself (or replaceable by itself) or have any suggestions? Or does the whole drive motor assembly & tachogenerator ($$) have to be replaced? Thanks in advance, Mark Brideson RAS Sacramento, CA. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: torque limiter replacement Message-ID: From: "Moore, Lee" To: "'linac-eng@plato.aristotle.net'" Subject: torque limiter replacement Date: Thu, 3 Jun 1999 09:45:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" could anyone give any info or suggestions regarding the replacement of the torque limiter on a 2300c/d machine? I have already adjusted as far as i can and replacement time has arrived. any info would be appreciated. thanks in advance. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Service Rep. Opening Message-ID: From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: Service Rep. Opening Date: Wed, 2 Jun 1999 15:22:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" RS&A, Inc. has an opening for a Service Rep. in the Carolinas. We have a good area, with good people. RS&A has a great benefits package, Medical, Dental Ins., and a very competitive pay scale. This position requires travel and evening work, with an occasional weekend. This position requires troubleshooting and repair of Accelerators and Simulators. (Varian, Siemens and Oldelft) If you are interested, please email : RSAINC1@Aol.Com Visit our Website www.RSA-INC.com or telephone @ 704-843-7285 Thank you, Roger Wood VP & Service Manager RS&A, Inc. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SIEMENS MLC DISPLAY Message-ID: <01BEAD01.3D6BCC80.victor@mail.mctrf.mb.ca> From: Victor Goertzen To: 'linac-eng messages' Subject: SIEMENS MLC DISPLAY Date: Wed, 2 Jun 1999 10:07:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a Siemens Mevatron with a MLC. The model we have has the plasma display behind the plastic protractor in the gantry showing leaf postion. The display is basically a 486 PC with a firmware boot. We are having problems with this display hanging up when it is warm or it gives a "8042 GATE A20 ERROR SYSTEM HALTED". The CPU board is manufactured by OKAYA and it is model P-8892. Does anyone know anything about this display, configuration, how to get a spare from the manufacturer or even Siemens. The newer machines don't come with this display anymore as leaf position is intigrated into the console somehow. Thanks Chris Dyke Electronic Technologist Department of Medical Physics Manitoba Cancer Treatment and Research Foundation (204)787-2192 e-mail chris.dyke@mctrf.mb.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Brainlab M3 users Message-ID: From: Steve Nelson To: 'Linac Engineers' Subject: Brainlab M3 users Date: Wed, 2 Jun 1999 09:29:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello group, I'm wondering how many, if any, of you have a Brainlab Micro-multileaf collimator as an accessory to your Varian linac. And if so, what kind of problems have you may have encountered. regards, steve Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 803-792-3271 nelson@radonc.musc.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian 2100C w/PV gantry balance Message-ID: <457B79AC7AB2D211AAAC006097BDA653062461@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: Varian 2100C w/PV gantry balance Date: Wed, 2 Jun 1999 08:06:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to solicit ideas. We have a 2100C with a Portal Vision R-Arm attachment. The gantry is out of balance (left from installation). I have added as much of the Varian style weights to the top side of the gun deck as the studs and cover height will allow. I am still heavy on the PV side. I can't see anything that I could 'take off' over there. I am guessing at this point that I might need about 30#'s or so...maybe more. Is the out of balance condition normal for PV installation? What can I do to correct being 'bottom heavy'? Thanks and regards to the list. Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Used Linac Sale Message-ID: <01BEACDB.78305000.kevinpueschel@worldnet.att.net> From: Kevin Pueschel Reply-To: kevinpueschel@worldnet.att.net To: "Wilson, Jim" Subject: RE: Used Linac Sale Date: Wed, 2 Jun 1999 05:36:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The Doctors that I work with are interested in the 2100C. If you wanted to sell all of the machines as a package, that could probably be arranged too. Do you have any idea of what will be asked for the equipment? Thank you Kevin Pueschel -----Original Message----- From: Wilson, Jim [SMTP:JWilson3@providence.org] Sent: Wednesday, May 26, 1999 5:30 PM To: 'kevinpueschel@worldnet.att.net' Subject: RE: Used Linac Sale << File: CL2100info.doc >> << File: CL4info.doc >> << File: Siminfo.doc >> Thank you for your patience. Here are some documents that may assist you in evaluating our equipment. You can reach Rich Rodriguez at rrodriguez@providence.org or by phone at 503-216-5807. My phone is 503-216-2949. Jim Wilson Providence Health Systems Clinical Engineering Portland Or. -----Original Message----- From: Kevin Pueschel [mailto:kevinpueschel@worldnet.att.net] Sent: Monday, May 24, 1999 6:10 AM To: 'Wilson, Jim' Subject: RE: Used Linac Sale I am associated with a Doctor's group that is interested in the 2100C . Please contact me at your convenience or supply a phone number to contact you concerning this equipment. Thank you. Kevin Pueschel 813-643-9527 kevinpueschel@worldnet.att.net -----Original Message----- From: Wilson, Jim [SMTP:JWilson3@providence.org] Sent: Friday, May 14, 1999 7:37 PM To: 'Linac Bulletin Board Posting' Subject: Used Linac Sale Ladies and gentlemen, We are in the midst of putting together a new radiation therapy department in our facility. Since the plan is to move to a new area, we are strongly considering selling our current equipment and buying new. We currently have a Varian Clinac-2100c SN 256 Version 3 Software with the new style applicators. Also a Varian Clinac-4 SN 98 and a Toshiba LX30 Simulator. We would like to receive bids for this equipment if anyone is interested or knows of someone who is. Please send inquiries to rrodriguez@providence.org or reply back to me. Thank you, Jim Wilson Clinical Engineering Providence Health Systems ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DS: Portal Vision Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: DS: Portal Vision Date: Sat, 29 May 1999 06:24:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry gents, It's a Varian PV Mark I with 400V cassette (believe it or not) build in 1996. > ---------- > Van: Peter E. Vitali[SMTP:peter.vitali@yale.edu] > Verzonden: vrijdag 28 mei 1999 17:02 > Aan: CJ.de.Bruijne@walcheren.ziekenhuis.nl > CC: Linac-Engineers, Listserver > Onderwerp: Re: Portal Vision > > Kessjan: You did not name the manufacture of the Portal Vision System, > the model, and approximate year manufactured. > > Thanks > > Peter E. Vitali, CBET > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sage Rotary Joint Message-ID: From: Radsrus@aol.com To: "Wilson, Jim" Subject: Re: Sage Rotary Joint Date: Fri, 28 May 1999 16:29:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, Now I remember! Since then, we have had to replace the 6.75 X 1/8 and 6 1/4 X 3/32" rings in a new style rotary joint. Is this what your using? We have them in stock if you need them under stock # 48-8060 & 48-8064. Rgds, Steve Schwarz ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sage Rotary Joint Message-ID: <18aee698.24806bea@aol.com> From: Radsrus@aol.com To: "Wilson, Jim" Subject: Re: Sage Rotary Joint Date: Fri, 28 May 1999 14:00:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, I don't have any Sage info however we do carry repair parts for the RF rotary joint. Let me know what the prob is, maybe we can help. Rgds & have a great weekend, Steve Schwarz, Acceletronics ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Portal Vision Message-ID: <374EAFC6.69994064@yale.edu> From: "Peter E. Vitali" To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: "Linac-Engineers, Listserver" Subject: Re: Portal Vision Date: Fri, 28 May 1999 07:02:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kessjan: You did not name the manufacture of the Portal Vision System, the model, and approximate year manufactured. Thanks Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Portal Vision Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Portal Vision Date: Fri, 28 May 1999 06:12:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello list-eners Any PV specialist here? We do have a problem with image quality. This quality went poor, and as we checked the capacitance image there was a fine patern and there were soft-edged horizontal bars. Then we found the +-15V PS to the cassette very hot. Voltages are ok with cassette disconnected, but +15 V drops to 12,7V with connected cassette. The cassette-made HV is ok (400V). I guess the cassette is somehow drawing to much current. Had any of you the same kind of fault? Regards, Keesjan de Bruijne Ziekenhuis Walcheren / ZRTI Vlissingen, THE NETHERLANDS CJ.de.Bruijne@walcheren.ziekenhuis.nl If it's tourist season, why can't we shoot them? (Christer Weinigel) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: Conference Call Message-ID: <0F5B9F57891AD211BF2100805FA7316CDFB3B9@PHSORMSG03> From: "Scharbach, Dan" To: "Wilson, Jim" Subject: FW: Conference Call Date: Fri, 28 May 1999 06:15:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Jim....this sounds pretty good to me if Quinton can come up with the two additional Qcaths for PPMC. How about with you? Dan > -----Original Message----- > From: Dickson, Larry > Sent: Wednesday, May 26, 1999 4:05 PM > To: Wilson, Jim > Cc: Scharbach, Dan > Subject: RE: Conference Call > > Jim > Sorry for the delay. John Friesner, VP, cannot make the call tomorrow so I > will try and set up for the week you are back. Is there someone I can call > in I/S to get your and they're calendars lined up while your gone next > week? > I believe we should go for a 40% reduction in the 12 lead upgrade, accept > the $1750 4.4X / 4.41 upgrade as proposed, accept a twelve month warranty, > drop any inservice education costs, accept the September 30th completion > date, ask for a 25% discount on the 100 MHz Computer and insure that any > N/C video consoles promised you will be honored. If we can get your total > bill down to $45,750 I believe we should take the deal. St. Pat's, > Benefis, Sacred Heart and Yakima are already 12 lead upgraded so their > cost for the 4.4x will be $1750 with all the other above benefits except > the N/C video consoles. > > Larry > System Director,Materials Management > Sisters of Providence Health System > (206) 464-3982 Ph. > (206) 464-3038 Fax > ldickson@providence.org > > -----Original Message----- > From: Wilson, Jim > Sent: Wednesday, May 26, 1999 2:49 PM > To: Dickson, Larry > Cc: Leeder, Mike > Subject: Conference Call > > Hi Larry, > Have you been able to set up the conference call for this week? I > will be gone next week. Our I.S. contact on this matter would also like to > get in on this call if possible. Please let me know if something is > scheduled. > Thanks, > Jim ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Gantry chain lubrication Message-ID: <457B79AC7AB2D211AAAC006097BDA653062456@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: "Loeks, Michael" , 'Linac list' Subject: RE: Gantry chain lubrication Date: Thu, 27 May 1999 11:48:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My first guess is that oil is not dripping from the chain but from the gantry bearing. The grease is separating from the oil. Clean the chain, regrease the gantry bearing and clean off all grease. You will have to remove the covers to do this. I would think that you would have to change the clutch pads too. I don't think that the chain itself requires periodic lubrication. (At least I never have in 15 years) Richard L. Kimball Senior Engineer Department of Radiation & Cellular Oncology The University of Chicago Hospitals Tel. 773.702.6879 -----Original Message----- From: Loeks, Michael [mailto:MLoeks@providence.org] Sent: Thursday, May 27, 1999 12:46 PM To: 'Linac list' Subject: Gantry chain lubrication Hello, I have a 2300C/D and a 2100C/D that have an ongoing problem with oil dripping from the chain onto the gantry drive clutch. I have not lubricated the chain since I have been maintaining these machines. I was wondering if anyone else has a problem with this and what lubrication is specified for the chain. I would assume that a dry lube would be in order for this application. TIA, Michael Loeks Clinical Engineering Technician Providence Portland Medical Center Portland, Oregon ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: OB/GYN Ultrasound System Message-ID: <3F7128BCAC04D211838F00805FA76DE4220EF3@PHSORMSG02> From: "DelaRosa, Ella" To: "Wilson, Jim" Subject: OB/GYN Ultrasound System Date: Thu, 27 May 1999 12:23:26 -0800 Importance: high X-Priority: 1 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim - Prov Fam Med/Wilsonville has requested from Purchasing information on a good ob/gyn ultrasound system. I have given them product info and quotes from three reputable companies - 1. GE Medical Systems (VHA/Novation Contract) RT3200 Advantage III console $29,750 (This is an older model) Logiq 200 Ultrasound console $37,803 (Newer model w/ better picture clarity and features) 2. ATL, Ultrasound Ultramark 400 system $32,500 3. Siemens Sonoline Prima imaging system $32,517 The clinic has demo'd the ATL but was not too pleased. They have not even looked at the other two. However, they have requested me to contact a company called "Harrell Medical, Inc." from Lake Oswego, OR, and wanted to see if they can demo the "Shimadzu SDU-350A Portable Ultrasound System ($25,000). I have not heard of this company before, and I understand they are the distributor locally for Shimadzu. I was told that Shimadzu is a small Korean company who manufactures a good system, but does not have good local service support. The branch office is in California. They are very aggressive in capturing the clinical market because of the lower price, but I am concerned about service. Is Biomed familiar with this product? Will you be able to service this if something goes wrong? Do you have any other recommendation for something that is geared towards a clinic environment? Pls. advise, and thanks for your help. Ella DelaRosa Senior Buyer 215-4448 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: HDTSe Message-ID: <3.0.2.32.19990527150509.006ab508@pop.uky.edu> From: Dan Farrer To: linac-eng@plato1.aristotle.net Subject: HDTSe Date: Thu, 27 May 1999 11:05:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The 2100 S/N 507 at my site had a similiar problem with low dose rates in the high dose rate mode. It was also a similiar situation where the mode was not used for months. The first correction was the DQing was 0% in HDTSe and only approximately 20% in all other energies. A few rectifier diodes in the HV power supply were shorted and all twelve were replaced. I then had about 750-800 MU/min unservoed. No other problems could be found. Finally the gun filaments were tweaked from 5.26 to 5.46 and we now have dose rate of 880-900 unservoed. D Farrer ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: HDTSe Message-ID: <3.0.2.32.19990527150509.006ab508@pop.uky.edu> From: Dan Farrer To: linac-eng@plato1.aristotle.net Subject: HDTSe Date: Thu, 27 May 1999 11:05:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The 2100 S/N 507 at my site had a similiar problem with low dose rates in the high dose rate mode. It was also a similiar situation where the mode was not used for months. The first correction was the DQing was 0% in HDTSe and only approximately 20% in all other energies. A few rectifier diodes in the HV power supply were shorted and all twelve were replaced. I then had about 750-800 MU/min unservoed. No other problems could be found. Finally the gun filaments were tweaked from 5.26 to 5.46 and we now have dose rate of 880-900 unservoed. D Farrer ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Gantry chain lubrication Message-ID: From: "Loeks, Michael" To: 'Linac list' Subject: Gantry chain lubrication Date: Thu, 27 May 1999 09:45:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, I have a 2300C/D and a 2100C/D that have an ongoing problem with oil dripping from the chain onto the gantry drive clutch. I have not lubricated the chain since I have been maintaining these machines. I was wondering if anyone else has a problem with this and what lubrication is specified for the chain. I would assume that a dry lube would be in order for this application. TIA, Michael Loeks Clinical Engineering Technician Providence Portland Medical Center Portland, Oregon ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sage Rotary Joint Message-ID: <374D5143.D4DAA0EB@scf.sk.ca> From: S Thiesson To: "Wilson, Jim" Subject: Re: Sage Rotary Joint Date: Thu, 27 May 1999 06:05:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The last time I checked...which was a while ago ...they were at: Sage Laboratories inc. Natick Mass. 508-653-0844 Happy hunting. Scot Thiesson A.B.C.C. Regina Sask. Canada "Wilson, Jim" wrote: > Does anyone have information on the company that make the SAGE rotary joint? > (Varian linacs). > > Jim Wilson > Clinical Engineering > Providence Health Systems ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Sage rotary joint Message-ID: From: "Loeks, Michael" To: "Wilson, Jim" Subject: Sage rotary joint Date: Thu, 27 May 1999 06:07:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, Point your browser at: http://www.sagelabs.com/components/rotaryjoints.html Michael Loeks Clinical Engineering Technician Providence Portland Medical Center Phone X55691 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Sage Rotary Joint Message-ID: <374D3A0B.4F98C1E8@yale.edu> From: "Peter E. Vitali" To: "Wilson, Jim" Subject: Re: Sage Rotary Joint Date: Thu, 27 May 1999 04:26:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim: What joint is that? Water or RF Guide. Pete Vitali ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: thyratrons Message-ID: <000001bea7d4$0d961ec0$64b86ed1@oemcomputer> From: Wayne O'Neill To: linac-eng@plato1.aristotle.net Subject: thyratrons Date: Wed, 26 May 1999 15:43:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In response to Lee Moore's inquiry on 5/26: You're right that an aging main thyratron tube will cause HVOC's. These tubes have a rarefied hydrogen gas in them that, when ionized, provides conduction. Tubes used for the main thyratron also have two grids. One of these grids, the one nearest the cathode, has a positive potential on it and keeps the region between it and the cathode ionized. Because of a dropping resistor, the voltage on the grid is determined by the voltage drop across the plasma. This is called the keep-alive voltage and is what TP3 measures. When a trigger pulse is felt on the second grid, the voltage on the anode is allowed to ionize the entire tube. The cathode/anode circuit becomes, for all practical purposes, a direct short and remains so until the anode voltage is removed. The partial pressure of the hydrogen inside the thyratron is critical for proper operation. If it is incorrect, such as with old tubes, the plasma may not extinguish quickly enough, loading down the HVPS and, in turn, cause HVOC's. Since hydrogen molecules (H2) are small and mobile, they slowly diffuse through the walls of the glass tube. This is how thyratrons age. This characteristic makes it difficult to keep a spare tube because they continue to age on the shelf. It is also something to keep in mind when buying a thyratron - the supplier should be using a first-in, first-out inventory system. On older 2100C's using a CX1159 thyratron, a new keep-alive voltage was 10-15V and 24-25V indicated tube replacement. The 2300C/D figures may be different but I should think a quick call to Varian would provide an answer. Hope this helps. Wayne O'Neill ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Conference Call Message-ID: From: "Dickson, Larry" To: "Wilson, Jim" Cc: "Scharbach, Dan" Subject: RE: Conference Call Date: Wed, 26 May 1999 15:04:58 -0800 Return-Receipt-To: "Dickson, Larry" MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain Jim Sorry for the delay. John Friesner, VP, cannot make the call tomorrow so I will try and set up for the week you are back. Is there someone I can call in I/S to get your and they're calendars lined up while your gone next week? I believe we should go for a 40% reduction in the 12 lead upgrade, accept the $1750 4.4X / 4.41 upgrade as proposed, accept a twelve month warranty, drop any inservice education costs, accept the September 30th completion date, ask for a 25% discount on the 100 MHz Computer and insure that any N/C video consoles promised you will be honored. If we can get your total bill down to $45,750 I believe we should take the deal. St. Pat's, Benefis, Sacred Heart and Yakima are already 12 lead upgraded so their cost for the 4.4x will be $1750 with all the other above benefits except the N/C video consoles. Larry System Director,Materials Management Sisters of Providence Health System (206) 464-3982 Ph. (206) 464-3038 Fax ldickson@providence.org > -----Original Message----- > From: Wilson, Jim > Sent: Wednesday, May 26, 1999 2:49 PM > To: Dickson, Larry > Cc: Leeder, Mike > Subject: Conference Call > > Hi Larry, > Have you been able to set up the conference call for this week? I > will be gone next week. Our I.S. contact on this matter would also like to > get in on this call if possible. Please let me know if something is > scheduled. > Thanks, > Jim ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: main thyratron tp3 reading Message-ID: From: "Moore, Lee" To: "'linac-eng@plato.aristotle.net'" Subject: main thyratron tp3 reading Date: Wed, 26 May 1999 11:38:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a 2300c/d with intermittant hvoc's occurring. I am suspecting an aging main thyratron tube. I understand the main thyratron tp3 voltage typically will increase with tube age and could show time for replacement soon. does anyone know what the normal voltage reading should be? (and also what tp3 should be referenced to) Any info you could give regarding this would be greatly appreciated. thanks in advance. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 6mev Hi Dose Rate Mode Message-ID: <25bcd29d.247c4932@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: 6mev Hi Dose Rate Mode Date: Tue, 25 May 1999 10:42:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone: I have a problem with the Hi Dose mode on a 2500 C ver 2. The dose rate is only about 175 mu/min well short of the >888 unservoed. I checked tuning and pulse rates and everything appears normal. One thing I noted was that I was able to effect dose rate in the service mode by reselecting a different "rep rate" selection. I don't know if this is normal. I'm in a bind as the customer hasent used the mode for months and now has a patient. Any help would be appreciated. Thanks in advance. Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 6mev Hi Dose Rate Mode Message-ID: <25bcd29d.247c4932@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: 6mev Hi Dose Rate Mode Date: Tue, 25 May 1999 10:42:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone: I have a problem with the Hi Dose mode on a 2500 C ver 2. The dose rate is only about 175 mu/min well short of the >888 unservoed. I checked tuning and pulse rates and everything appears normal. One thing I noted was that I was able to effect dose rate in the service mode by reselecting a different "rep rate" selection. I don't know if this is normal. I'm in a bind as the customer hasent used the mode for months and now has a patient. Any help would be appreciated. Thanks in advance. Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: rotational stereotatic Message-ID: From: "Williams, Rod" To: "'linac-eng@plato1.aristotle.net'" Subject: rotational stereotatic Date: Tue, 25 May 1999 07:26:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello again. I am not having problems, I am looking for someone who has installed/ designed rotational dynamic stereotatic on their CD or EX Linac, I have installed my own design on our 1800 Linac and I need to do the same to our new Linac. equipment . Any help or advice would be appreciated. Note! rotational stereos have the table rotate .5 degree for every 1 degree of gantry rotation. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Rotation dynamic stereotatic procedures Message-ID: From: "Williams, Rod" To: "'linac-eng@plato1.aristotle.net'" Subject: Rotation dynamic stereotatic procedures Date: Mon, 24 May 1999 10:26:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello group I am looking for anyone who has or is doing rotational stereos with their CD or EX linacs. I need to set up a EX for rotational stereotatic procedures. Thanks Rod Williams ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Equipment Request Message-ID: <37449626.6D54D489@ibm.net> From: tjess@ibm.net Reply-To: tjess@ibm.net To: "Wilson, Jim" Subject: Equipment Request Date: Thu, 20 May 1999 15:09:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim: I apologize, but I sent an email earlier in the week and I am very interested in the potential for learning more and making offer on this equipment. Once again, my name is Tim Jess and I would need more information. For example, I need ages and background on glassware for everything. Is the Clinac 4 a 100 or 80cm machine? Counter or beam? Baseframe available? The 2100 is of interest: Does it have the ETR or Exact couch? C/D package? MLC? etc. The Toshiba is very standard and very reliable. And very basic. However, I would need data on the generator, II and x-ray tube. If you have a moment, please call me in Seattle at 425-483-1888 or fax whatever may be available. Above all, when could this project happen? When would the equipment be available for deinstallation? This information is the most critical part of developing a price. Thanks, and I look forward to hearing from you. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Gamma Knife Unit Message-ID: <37442BD1.FF15803@wfubmc.edu> From: Tim Cullen To: Linac eng Subject: Gamma Knife Unit Date: Thu, 20 May 1999 07:35:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is a request for anyone having a gamma knife unit at their facility. We are in progress doing construction and preparation for a leksell gamma unit to be installed mid-summer. I was wondering if anyone had any positive or negative experiences concerning site-prep, installation, oh-by-the-way's, or any "heads up" info. Also was there any training for the in-house linac engineer on the electronics/mechanics of the unit and was this done on-site or at a school? Thanks in advance ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Dedicated Keyboard Membrane Message-ID: <000701bea2d4$91553700$69c4ce98@pwserver> From: Steve Schwarz To: tex@dial.pipex.com, linac-eng@plato1.aristotle.net Subject: Re: Dedicated Keyboard Membrane Date: Thu, 20 May 1999 07:22:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Subj: Dedicated keyboard membrane Date: 5/20/99 8:32:14 AM Central Daylight Time From: tex@dial.pipex.com (Radiotherapy Technicians) Sender: owner-linac-eng@plato1.aristotle.net Reply-to: tex@dial.pipex.com (Radiotherapy Technicians) To: linac-eng@plato1.aristotle.net Hi group Can anyone tell me if the membrane pcb for the dedicated keyboard is availble seperately. If so what is the part number Thanks in advance Rob Bailey North Staffs Oncology Centre UK >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Hi Rob, Acceletronics, Inc. has new membrane switch PCBs for the dedicated keyboard in stock for immediate delivery. The cost is $220.00 USD, plus shipping. Our part number is 12-1001-0C and comes with a 90 day warranty. This circuit board comes without the posts, rails & keys. You will have to transfer these items from your old board. You might also want to consider a dedicated keyboard skin (p/n 99-2015-00 for $35.00) which protects the keyboard from spills and extends key life. For further information or to order, please feel free to call us at 800-626-8704 (847-735-8338), fax us at 847-735-8394 or email us at parts@acceletronics.com. For payment, Acceletronics takes Visa/MC, E-checks, PO's, COD orders, Money orders, Bank Drafts and transfers. Hope this info helps, Steve Schwarz, Acceletronics sschwarz@acceletronics.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: AFC time Elekta SL 75/5 Message-ID: <99May20.103855edt.115599@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: AFC time Elekta SL 75/5 Date: Thu, 20 May 1999 06:32:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" One easy way to check your afc operation is to set it on the frequency you want, then switch the servo to manual for a moment and drive it off slightly in either direction, then turn the servo on again. You should see the error signal recover. Using a scope is best for this procedure. I don't know if you have a way to see of these signals, some of these machines are so bloody digital they don't give you any waveforms to look at. I know, let the computer fix it! Regards, Tom Feuerstake PMH Toronto -----Original Message----- From: Ole@medfys.aau.dk [SMTP:Ole@medfys.aau.dk] Sent: Thursday, May 20, 1999 4:16 AM To: linac-eng@plato1.aristotle.net Subject: Re: AFC time Elekta SL 75/5 Hi Ron, My AFC behave like yours. I've just measured the AFC time from one limit to another : 1min 45 sec. And the accelerator works fine. Cheers Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: AFC drive on an SL75 - results. Message-ID: <4.1.19990520222802.009674d0@mail.iinet.net.au> From: Ron Kimber To: linac-eng@plato1.aristotle.net Subject: AFC drive on an SL75 - results. Date: Thu, 20 May 1999 06:39:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gidday again all, my thanks to all who replied re the AFC drive times on an SL75/5. All of the comments were most valid and appreciated. It appears that the MANUAL drive can take anytime from 30 seconds to our two minutes and still be "correct". My machine only gets 13-14volts at the motor with manual drive even though the diagrams say it is fed straight from +/- 24V supply with only a switch or two in the way. I don't know why our figure is different but I will be waiting for a very rainy day to go looking. (It doesn't really matter as long as you know about it). My original problem turned up again this morning after the unit had been running for two hours with no hint of trouble. (Aren't all our problems nowadays intermittent). It ended up that the a relay contact (HT Hold - RL"D" on relay card) was the culprit. This resides at the output from the AFC driver and meant the motor saw nothing of the 26volts the AFC was trying to send it. It appears everything else was fine and now I just have to test the maggy removed to see if I am suffering the two faults at once syndrome or not. (I had been meaning to make time to run our spare magnetron anyway). Once again thanks for all the replies. Regards Ron Kimber ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Dedicated keyboard membrane Message-ID: <000201bea2c3$ffbf4480$c94a95c1@tech-office> From: Radiotherapy Technicians Reply-To: Radiotherapy Technicians To: linac-eng@plato1.aristotle.net Subject: Dedicated keyboard membrane Date: Thu, 20 May 1999 05:22:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi group Can anyone tell me if the membrane pcb for the dedicated keyboard is availble seperately. If so what is the part number Thanks in advance Rob Bailey North Staffs Oncology Centre UK Ps Anyone going on the low energy training course in August. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: AFC time Elekta SL 75/5 Message-ID: <36E696B564E@medfys.aau.dk> From: Ole@medfys.aau.dk To: linac-eng@plato1.aristotle.net Subject: Re: AFC time Elekta SL 75/5 Date: Thu, 20 May 1999 00:16:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Ron, My AFC behave like yours. I've just measured the AFC time from one limit to another : 1min 45 sec. And the accelerator works fine. Cheers Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: ETR couch lift noise update Message-ID: From: MLancaster@aol.com To: Linac-eng@plato1.aristotle.net Subject: ETR couch lift noise update Date: Wed, 19 May 1999 14:26:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A couple of weeks ago I posted a question about ETR lift noise which I suspected was the lower bearing. First, thanks to everyone who offered advise. The problem (as suggested by Gary, I think) turned out to be the motor -- in spite of the fact it was only about 6 months old. Thanks again, Mike Lancaster ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: AFC time Elekta SL75/5. Message-ID: <99May19.154206edt.115621@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: AFC time Elekta SL75/5. Date: Wed, 19 May 1999 11:35:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" It sounds too slow to me, though we don't have a '75 here. The afc's and response times should be roughly similar to our SL25's. Since you changed the Magnetron and the problem is the same, check the AFC drive cct to see if you can get maximum output from it. -Linac Gods or Devils? Regards, Tom Feuerstake PMH Toronto -----Original Message----- From: Ron Kimber [SMTP:procbms@opera.iinet.net.au] Sent: Wednesday, May 19, 1999 12:03 PM To: 'Linac Engineers' Subject: AFC time Elekta SL75/5. A big hi to all you overworked, underpaid servants to the linac gods. I have a small enquiry of you Elekta/Philips SL75 experts. How long does it take for the AFC to drive the mag tuner from one limit to the other under manual control. My machine takes a full 2 minutes and that seems a bit too long to me. I've never really taken much notice before so am in the dark with only one machine and therefore no comparison. Just swapped out a magnetron when unable to get a beam (looked like mag may have been way off frequency). Now I am not sure if the maggy was the problem or if the AFC being so slow was the real trouble?? As always my appreciation to any replies received. Regards to all. Ron Kimber Biomedical Engineering Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA AUSTRALIA 6014 Phone: 61 (0) 8 - 93815655 Mobile: 041 993 7776 Fax: 61 (0) 8 - 93814364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Recurring HWFA's Message-ID: From: "Lapenna, Russ" To: "'Accelinear@aol.com'" , "Lapenna, Russ" , dmelsnes@bccancer.bc.ca, linac-eng@plato1.aristotle.net, woncspb@wnhealth.co.nz Subject: RE: Recurring HWFA's Date: Wed, 19 May 1999 06:02:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Well it has been shown that this adjustment does indeed eliminate these HWFA's and since performing it last night we have not experienced one during today's treatments, but thanks for the advice. Russ LaPenna Hamilton Regional Cancer Centre > > I fail to see how adjusting the jaw backlash will reduce the > incidence of > primary/secondary readout errors. The purpose of that > adjustment is to keep > the upper jaws from moving due to the effects of gravity > while rotating the > gantry or collimator. The readouts will still be very > accurate even if the > backlash is very loose. > > If you are having 17+ HWFA interlocks per day I should think > that the cause > could be isolated to a single readout line rather quickly and > from there to > the defective part or connection. Most of us usually have to > find HWFAs that > occur only once every two or three weeks. > > With all due respect, generally observed safety standards in > this industry > and the manufacturer's operator's guidelines would warrant > that a machine > experiencing even a small fraction of that number of HWFAs > per day that your > machine is experiencing should be taken out of clinical > service until the > problem is corrected. > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Recurring HWFA's Message-ID: From: "Lapenna, Russ" To: 'Don Melsness' , linac-eng@plato1.aristotle.net, woncspb@wnhealth.co.nz Subject: RE: Recurring HWFA's Date: Tue, 18 May 1999 12:27:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable This was a post to the list from a while back, and we now find ourselves in the same shoes. We are unclear however about the = adjustment you mention. I don't know if it is possible to elaborate at all. We found = the small plate that reveals the gear, but did not see the clamp you = mentioned that allows us to push the gears together. If Don or anyone for that = matter can clarify it would be greatly appreciated as 17+ HWFA's /day is = getting to be a bit much. Russ LaPenna Hamilton Regional Cancer Centre > Hi Shaun, >=20 > We, too, were plagued with recurring HWFA faults (both Y1 &=20 > Y2 jaws) on our > Varian > machines here. =20 > We finally discovered that there was a small amount of play=20 > in the worm gear > setup that > drives the affected jaw. There is a small plate which , when removed, > reveals the gear > assembly (refer to Upper Coll drawing #882825, cross section B-B). = By > loosening the > clamp, pushing the gears together and then re-tightening, the=20 > backlash can > be removed. >=20 > Now, whenever we start getting intermittent y-jaw HWFA=20 > faults, we make this > adjustment > first.....it usually fixes the problem. >=20 > Regards, >=20 > Don Melsness > BC Cancer Agency > Vancouver, BC, Canada >=20 > ---------- > =BBFrom: woncspb@wnhealth.co.nz > =BBTo: linac-eng@plato1.aristotle.net > =BBSubject: Recurring HWFA's > =BBDate: Wednesday, May 05, 1999 4:34PM > =BB > =BBHi All, > =BB > =BBWe have an upgraded 2100-C (#42) that has had a recurring=20 > Primary/2nd cha > =BBmismatch HWFA fault on its Y1 collimator over the last few months. > =BBOur Varian engineer has changed the primary PRO pot 3 times=20 > and each time > we > =BBhave had almost exactly one months respite from the HWFA's until = they > return > =BBagain. > =BBHas anyone else experienced this sort of problem? Any=20 > thoughts or possible > =BBsolutions would be greatly appreciated. > =BB > =BBThanks, > =BB > =BBSh=E1un Baggarley > =BB********************************************************* > =BBSh=E1un Baggarley Ph: (+64 4) 3855837 > =BBChief Physicist Fax: (+64 4) 3855984 > =BBWellington Cancer Centre Email: woncspb@wnhealth.co.nz > =BBWellington Hospital > =BBPrivate Bag 7902 > =BBWellington 2 > =BBNew Zealand > =BB >=20 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: life and death of a C2 series magnetron -Reply Message-ID: <99May18.090947bst.11750@minotaur.ulth.northy.nhs.uk> From: Steve SIMPSON To: linac-eng@plato1.aristotle.net Cc: chrisf@ulth.northy.nhs.uk Subject: life and death of a C2 series magnetron -Reply Date: Tue, 18 May 1999 01:10:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" >>> Most commonly, during the major arcing, an "ACC" fault happens. We have a 600C which will sometimes give an ACC fault when the magnetron is arcing. Steve Simpson Cookridge Hospital Leeds UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Used Radiation Therapy Equipment Message-ID: <374118F3.7AAEAA3C@ibm.net> From: tjess@ibm.net Reply-To: tjess@ibm.net To: "Wilson, Jim" Subject: Used Radiation Therapy Equipment Date: Mon, 17 May 1999 23:38:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim: My name is Tim Jess and I read with interest your email about the potential for two linacs and a simulator coming available. I am very interested in all three systems, however, I would need more information. For example, I need ages and background on glassware for everything. Is the Clinac 4 a 100 or 80cm machine? Counter or beam? Baseframe available? The 2100 is of interest: Does it have the ETR or Exact couch? C/D package? MLC? etc. The Toshiba is very standard and very reliable. And very basic. However, I would need data on the generator, II and x-ray tube. If you have a moment, please call me in Seattle at 425-483-1888 or fax whatever may be available. Above all, when could this project happen? When would the equipment be available for deinstallation? This information is the most critical part of developing a price. Thanks, and I look forward to hearing from you. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Used Linac Sale Message-ID: From: GARRYANGEL@aol.com To: "Wilson, Jim" Subject: Re: Used Linac Sale Date: Mon, 17 May 1999 16:23:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Jim I'm very interested in your Cl-2100 !!! What ENERGIES? Year installed? Age of KLYSTRON? Jim I'm prepared to make an offer. Please reply immediately!! Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: life and death of a C2 series magnetron Message-ID: <85256774.007E6EF3.00@mail.lrcc.on.ca> From: btonks@lrcc.on.ca To: RvrRtMark@aol.com, linac-eng@plato1.aristotle.net Subject: Re: life and death of a C2 series magnetron Date: Mon, 17 May 1999 15:00:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In my opinion that magnatron doesn't owe you anything. I would still check a few other things first. You want to make sure that the calculated PRF is not too high so you are not running the magnatron into a over temperature condition. This could be caused by a number of things but if your calculated PRF is close to where it has been then I would move onto the next thing. I would also check that the magnatron filament is shutting down as you run at clinical rates. I would also check the DQ thyratron by checking the HVPSI pulse. You could be pulsing the magnatron with 120 amps or so. Once you've exhausted all possibilities I would change the magnatron as soon as possible because when the short they can damage other parts of the machine. If you divide the cost of the magnatron by six years is almost for free, Bob Tonks London Regional Cancer Centre London, Ontario, Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: life and death of a C2 series magnetron Message-ID: From: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: life and death of a C2 series magnetron Date: Mon, 17 May 1999 13:50:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everybody, We have a Clincac 600c, s/n 189, 5.2 software, that we believe is losing the magnetron. It rarely kicks out a MOD fault, but by observing the mag pulse it shows some arcing. In between times it runs OK. I have reprocessed it a few times and it appears to be on frequency. When the somewhat minor arcing does occur, the machine sometimes gives off the tone that indicates the dropping floor is activated (the floor stays put). Most commonly, during the major arcing, an "ACC" fault happens. This occurs about 6 times per treatment day, a few hours apart sometimes. I've checked all of the power supplies for ripple and all related ground connections, and found no noise or ganty angle related problems. Varian has a modification for magnetrons that is supposed to take care of it, but it has not been released yet. Has anybody ever had these types of problems (or know a fix) when the magnetron is getting older? This one's about 6 years old and has a good amount of hours on it, we'd like to squeeze a little more life out of it if we can. Or is it just doomed? Thanks in advance, Mark Brideson RAS Sacramento, Ca. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mylar Message-ID: <37402DB4.604A90C2@yale.edu> From: "Peter E. Vitali" To: PPATNAUDE2@aol.com Cc: 'Linac Bulletin Board Posting' Subject: Re: Mylar Date: Mon, 17 May 1999 06:54:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Try your local plastic supplier. Pete Vitali ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Job Posting: Victoria BC, Canada Message-ID: From: Wayne Beckham To: 'Linac Engineers' Subject: Job Posting: Victoria BC, Canada Date: Sun, 16 May 1999 10:53:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is the third posting for this position. We may be in a position to consider non-Canadians (depending on national response). Please respond ASAP if you are interested. I will be away until May 31 so if you have any specific questions about the position before then please contact Mr. Glen Owen (details below). Regards to the list, Wayne. _________________________________________ Dr. Wayne Beckham Professional Practice Leader for Medical Physics Vancouver Island Cancer Centre 1900 Fort St. Victoria, BC, CANADA V8R 1J8 Voice: +1 (250) 370 8225 Fax: +1 (250) 370 8697 mailto: WBeckham@bccancer.bc.ca Electronics Technologist Position Vancouver Island Cancer Centre, B.C. Cancer Agency This position is in the Clinical Physics Department with two existing electronics technologists, one machinist and five physicists. The Vancouver Island Cancer Centre has the following equipment; two Elekta Linacs (SL75/5 and SL75/14), Theratronics Theratron 780, Philips Simulator, Philips RT 100 superficial unit, and a Nucletron Selectron LDR. Future expansion in 2001 (currently under construction) will include six new Linacs, CT Simulator, Simulator, Selectron LDR, and an HDR unit. Applicants should be familiar with all aspects of technical support in a radiation therapy environment, including medical linear accelerator service, dosimetry equipment repair, and should have some skills with computer networking, maintenance and development. For more information phone or email Dr. Wayne Beckham (250)370-8225 wbeckham@bccancer.bc.ca or Glen Owen (250)370-8418 gowen@bccancer.bc.ca. Send applications with resume to: B.C. Cancer Agency Vancouver Island Cancer Centre Dr. Wayne Beckham Clinical Physics Department 1900 Fort St. Victoria. B.C. V8R 2G1 Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: (no subject) Message-ID: <23bd737a.246e9841@aol.com> From: PPATNAUDE2@aol.com To: linac-eng@plato1.aristotle.net Subject: (no subject) Date: Sat, 15 May 1999 01:28:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" where can i purchase mylar film with a sticky backing for a saturn43 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Used Linac Sale Message-ID: <373CC3AA.BBECC0A3@oncologysystems.com> From: esuarez@oncologysystems.com To: "Wilson, Jim" Subject: Re: Used Linac Sale Date: Fri, 14 May 1999 16:45:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mr. Wilson, Radiation Oncology Systems, LLC purchases used radiation therapy equipment, focusing on linear accelerators and simulators. Feel free to call me next week at 619-671-9900 to discuss the matter. I look forward to talking to you. Thank You, Erik Suarez Operations Manager Radiation Oncology Systems, LLC ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Used Linac Sale Message-ID: <0F5B9F57891AD211BF2100805FA7316C52F7D0@PHSORMSG03> From: "Wilson, Jim" To: 'Linac Bulletin Board Posting' Subject: Used Linac Sale Date: Fri, 14 May 1999 15:37:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ladies and gentlemen, We are in the midst of putting together a new radiation therapy department in our facility. Since the plan is to move to a new area, we are strongly considering selling our current equipment and buying new. We currently have a Varian Clinac-2100c SN 256 Version 3 Software with the new style applicators. Also a Varian Clinac-4 SN 98 and a Toshiba LX30 Simulator. We would like to receive bids for this equipment if anyone is interested or knows of someone who is. Please send inquiries to rrodriguez@providence.org or reply back to me. Thank you, Jim Wilson Clinical Engineering Providence Health Systems ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Linac engineer vacancy in Adelaide South Australia Message-ID: <3.0.2.32.19990514091455.0068c2dc@senet.com.au> From: SE Net ARC Account To: linac-eng@plato1.aristotle.net Subject: Linac engineer vacancy in Adelaide South Australia Date: Thu, 13 May 1999 16:14:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Attached advertisement in three formats. I hope you can read one of them! If not fax your interest to David Paix at 61 8 8232 1243. cheers all David Paix Southern Radiation Services Pty Ltd ------_=_NextPart_002_01C19966.172FB140 Content-Type: application/msword; name="engrtoadvt.doc" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="engrtoadvt.doc" {\rtf1\ansi \deflang1033\deff0{\fonttbl {\f0\froman \fcharset0 \fprq2 Times;}{\f1\froman \fcharset0 \fprq2 = Times New Roman;}}{\colortbl \red0\green0\blue0;} {\stylesheet{\fs20 \snext0 Normal;} {\s1 \qj\fi-720\li720\sl0\tx720 1Bullet List;} {\s2 \qj\fi-720\li1440\sl0\tx720\tx1440 2Bullet List;} {\s3 \qj\fi-720\li2160\sl0\tx720\tx1440\tx2160 3Bullet List;} {\s4 \qj\fi-720\li2880\sl0\tx720\tx1440\tx2160\tx2880 4Bullet List;} {\s5 \qj\fi-720\li3600\sl0\tx720\tx1440\tx2160\tx2880\tx3600 5Bullet = List;} {\s6 \qj\fi-720\li4320\sl0\tx720\tx1440\tx2160\tx2880\tx3600\tx4320 = 6Bullet List;} {\s7 = \qj\fi-720\li5040\sl0\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040 = 7Bullet List;} {\s8 = \qj\fi-720\li5760\sl0\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx= 5760 8Bullet List;} {\*\cs9 \additive\fs36 QuickFormat1;} {\*\cs10 \additive\fs32 QuickFormat2;} }\margl1440\margr1440\ftnbj\ftnrestart\aftnnar \sectd \sbknone\endnhere = {\*\pnseclvl1\pndec\pnstart1{\pntxta .}} {\*\pnseclvl2\pnlcltr\pnstart1{\pntxta .}} {\*\pnseclvl3\pnlcrm\pnstart1{\pntxta .}} {\*\pnseclvl4\pndec\pnstart1{\pntxtb (}{\pntxta )}} {\*\pnseclvl5\pnlcltr\pnstart1{\pntxtb (}{\pntxta )}} {\*\pnseclvl6\pnlcrm\pnstart1{\pntxtb (}{\pntxta )}} {\*\pnseclvl7\pndec\pnstart1{\pntxta .}} {\*\pnseclvl8\pnlcltr\pnstart1{\pntxta .}} {\*\pnseclvl9\pnlcrm\pnstart1} \pard \qc\sl0=20 {\plain \f1\fs28 \par }\pard \sl0=20 {\plain \f1\fs28 \par }\pard \qc\sl0=20 {\plain \f1\fs28\lang3081 }{\plain \b\f1\fs28\lang3081 Southern = Radiation Services Pty Ltd.}{\plain \f1\fs28 \par }\pard \qc\sl0=20 {\plain \f1\fs28 Adelaide, South Australia\par }\pard \qc\sl0=20 {\plain \f1\fs32 }{\plain \b\f1\fs32 ENGINEER OR \pard \qc\sl0=20 }{\plain \*\cs9\fs36 }{\plain \*\cs9\b\f1\fs32 TECHNICAL}{\plain = \b\f1\fs32 }{\plain \f1\fs32 }{\plain \b\f1\fs32 OFFICER}{\plain = \f1\fs32 \par }\pard \sl-576 \keepn\pvpara\dropcapli2\dropcapt1 {\plain \*\cs9\dn9\fs108 }{\plain \*\cs9\b\dn9\fs108 }{\plain = \*\cs9\dn7\f1\fs84 S\par }\pard \sl0=20 {}{\plain \*\cs9\b\f1\fs28 outhern Radiation Services Pty Ltd}{\plain = \b\f1\fs32 }{\plain \f1\fs28 . provides a physics, information = technology=20 and engineering service to a busy radiotherapy practice located in = Adelaide,=20 South Australia. The practice is undergoing rapid expansion, yielding = a stimulating=20 and challenging work environment. \par }{\plain \f1\fs28 We are seeking an engineer or technical officer with = experience of medical radiation=20 oncology equipment.\par }{\plain \f1\fs28 Our responsibilities cover four Siemens linear = accelerators, two Varian simulators, a=20 cobalt unit and a superficial x-ray machine. We also maintain the = practice=20 information and treatment planning systems.\par }{\plain \f1\fs28 We are looking for someone with most of the following = attributes:\par }\sect \sectd \sbknone\endnhere=20 {\*\pnseclvl1\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl2\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl3\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl4\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl5\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl6\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl7\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl8\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\*\pnseclvl9\pnlcrm\pnstart1\pnindent720\pnhang} {\pntext\pard \'95 ab} \pard \s1\fi-720\li720\sl0\tx720 {\*\pn = \pnlvl1\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\plain \f1\fs28 a degree in electronics engineering, physics, or a = relevant technical=20 qualification.\par }{\pntext\pard \'95 ab} \pard \s1\fi-720\li720\sl0\tx720 {\*\pn = \pnlvl1\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\plain \f1\fs28 a knowledge of modern medical linear accelerator = operating principles\par }{\pntext\pard \'95 ab} \pard \s1\fi-720\li720\sl0\tx720 {\*\pn = \pnlvl1\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\plain \f1\fs28 prior linac or simulator maintenance and = troubleshooting experience\par }{\pntext\pard \'95 ab} \pard \s1\fi-720\li720\sl0\tx720 {\*\pn \pnlvl1\pnstart1\pnindent720\pnh= ang{\pntxta \'95}} {\plain \f1\fs28 ability to work in a team situation\par }{\pntext\pard \'95 ab} \pard \s1\fi-720\li720\sl0\tx720 {\*\pn = \pnlvl1\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\plain \f1\fs28 a knowledge of computers and computing networks\par }{\pntext\pard \'95 ab} \pard \s1\fi-720\li720\sl0\tx720 {\*\pn = \pnlvl1\pnstart1\pnindent720\pnhang{\pntxta \'95}} {\plain \f1\fs28 a flexible approach to working hours when emergencies = arise\par }\pard \sl0=20 {\plain \f1\fs28 \par }{\plain \f1\fs28 Adelaide is an attractive city of approximately one = million people. It has a=20 mediterranean climate with good access to wine-growing, bushwalking, = sporting and=20 cultural activities. Traffic and social problems are minimal, = providing an excellent=20 family environment. There are excellent educational facilities. = Housing costs are=20 among the lowest in Australia.\par }{\plain \f1\fs28 \par }{\plain \f1\fs28 An attractive salary will be negotiated for the right = applicant. Send your CV to:\par }{\plain \f1\fs28 \par }{\plain \f1\fs28 David Paix\par }{\plain \f1\fs28\lang3081 Southern Radiation Services Pty Ltd. \par }{\plain \f1\fs28 352 South Terrace\par }{\plain \f1\fs28 Adelaide SOUTH AUSTRALIA 5000\par }\pard \fi-1440\li1440\sl0\tx720\tx1440=20 {\plain \f1\fs28 phone:\tab (61) 8 8223 3022\tab fax: (61) 8 8232 = 1243\pard \fi-1440\li1440\sl0=20 }} ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/html; name="engrtoadvt.htm" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="engrtoadvt.htm"



Southern Radiation Services Pty = Ltd.

Adelaide, South Australia

ENGINEER OR TECHNICAL OFFICER

Southern Radiation = Services Pty Ltd. provides a physics, information technology and engineering service to a busy radiotherapy practice located in = Adelaide, South Australia. The practice is undergoing rapid expansion, yielding = a stimulating and challenging work environment.

We are seeking an engineer or technical officer = with experience of medical radiation oncology equipment.

Our responsibilities cover four Siemens linear = accelerators, two Varian simulators, a cobalt unit and a superficial x-ray machine. We also maintain the = practice information and treatment planning systems.

We are looking for someone with most of the = following attributes:

  • =95a degree in electronics engineering, = physics, or a relevant technical qualification.
  • =95a knowledge of modern medical linear = accelerator operating principles
  • =95prior linac or simulator maintenance and = troubleshooting experience
  • =95ability to work in a team = situation
  • =95a knowledge of computers and computing = networks
  • =95a flexible approach to working hours when = emergencies arise


Adelaide is an attractive city of approximately = one million people. It has a mediterranean climate with good access to wine-growing, bushwalking, = sporting and cultural activities. Traffic and social problems are minimal, = providing an excellent family environment. There are excellent educational facilities. = Housing costs are among the lowest in Australia.



An attractive salary will be negotiated for the = right applicant. Send your CV to:



David Paix

Southern Radiation Services Pty Ltd.

352 South Terrace

Adelaide SOUTH AUSTRALIA 5000

phone: (61) 8 8223 3022 fax: (61) 8 8232 1243

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name="ATT25365.txt" Content-Disposition: attachment; filename="ATT25365.txt" ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 8514/a fixed- Thanks Message-ID: <5fe77614.24686e1b@aol.com> From: Radsrus@aol.com To: Oktay.Ureten@science.ankara.edu.tr, linac-eng@plato1.aristotle.net Subject: Re: 8514/a fixed- Thanks Date: Mon, 10 May 1999 09:15:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Glad to help! My Regards, Steve Schwarz, sschwarz@acceletronics.com In a message dated 5/10/99 11:26:38 AM Central Daylight Time, Oktay.Ureten@science.ankara.edu.tr writes: << Subj: 8514/a fixed- Thanks Date: 5/10/99 11:26:38 AM Central Daylight Time From: Oktay.Ureten@science.ankara.edu.tr (Oktay Ureten) To: radsrus@aol.com Dear Steve, Thank you very much for helping me about my problem with 8514/A video adapter. I used a video amp/splitter as you suggested and the result was OK. One minor comment: Normally, R/V computer sends different video signals to in-room monitor (using 8514/A) and to R/V monitor(using onboard video). But onboard video has more than enough information for the in-room monitor. So, I split on-boad video signal to both monitors. Many thanks and regards, Oktay Ureten >Oktay >You should be able to find that card off the shelf - If the MB in the R/V >computer does have onboard video, you can use a video amp/splitter (one >cable in, 2 out), routing the cables to your video switches. OR you can >buy an add on video adapter with two outputs and handle it that way. >We've had better success with the amp/splitters, especially for long >cable runs. >If you have trouble finding what you need, call or email & we can help >you out. >Good Luck & My Regards, >Steve Schwarz, Acceletronics >800-626-8704 847-735-8338 >> ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 6x loss of output 2100c/d Message-ID: <73a4d14a.2467912b@aol.com> From: Accelinear@aol.com To: SMcna39074@aol.com, linac-eng@plato1.aristotle.net Subject: Re: 6x loss of output 2100c/d Date: Sun, 9 May 1999 17:32:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Regarding the fried contacts on the mode relay(s) (k3, K4) on newer 2100C's, the high failure rate of that item was noted on this BBS not too long ago. As I recall it was also mentioned that the problem seems to be caused by the cheaper relay used on the newer machines. Fortunately the relay used on the earlier machines is a drop in replacement with improved performance characteristics. The no-fail relay only cost about $50 more to purchase. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varis 1.2 C- Database Recovery Message-ID: <3735BD34.B37E7215@batelco.com.bh> From: Kumar To: Linac eng Subject: Varis 1.2 C- Database Recovery Date: Sun, 9 May 1999 08:52:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All Our Varis 1.2 C server crashed due to a power failure. Netware (ver 3.2 ) is still running and we are able to login to netware from the Varis terminals. The Sybase database seems to fully corrupted as it does not allow any user to login (even system adminstrator). The bad news is that the Tape back up on the server is faulty and we have no backup The Adminstrator workstation of Varis does a daily a daily database dump . Is it possible to retrieve the database from this.? How do we go about doing this? Please help Many thanks Kumar ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 6x loss of output 2100c/d Message-ID: <3377b838.24666fa4@aol.com> From: SMcna39074@aol.com To: linac-eng@plato1.aristotle.net Subject: 6x loss of output 2100c/d Date: Sat, 8 May 1999 20:57:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Note to all. Just done repairing a 2100c/d s/n 1023 which suffered a loss of output in 6x mode. rate would drop 30mu from beam on intermittantly. Unit has portal vision on it and the servo would try to compensate before failing with UNDR1/UNDR2 I/Ls. Looked like timing problem--gun pulse exceeds forward power pulse waveform. Not so, found deQuing was intermittant. Replaced deQuing thyratron, no change. Varian rep suggested that HV had lost a phase--how true! Wire on Phase A of K2 in the modulator was fried as were the contacts for phase A. Worse all the contact points in K2 contactor were fried. Suggest to the list that this surge suppressor contactor (40A) be inspected on annual PM. Varian rep has seen this before so maybe a design problem. Stan@cfsb.org Stan McNally Cancer Foundation of Santa Barbara 805-682-7300. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Oldelft Simulix Parts Message-ID: <001101be992b$526448e0$77541fc4@will> From: Will Pazda To: twaldron@notes.mdacc.tmc.edu, linac-eng@plato1.aristotle.net Subject: Re: Oldelft Simulix Parts Date: Sat, 8 May 1999 00:17:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tim, I had the exact same motor fail on me about Two weeks ago, I didn't even bother trying to source a replacement. I took it to a local transformer / motor re-wiring company (see your yellow pages) and after one and a half days, and approx. $50, the problem was solved. Of course, I'm assuming your problem's with the motor and not the gearbox, but even that you could probably get repaired at an engineering shop. Good Luck, Will Pazda ----- Original Message ----- From: To: Sent: 07 May 1999 23:10 Subject: Oldelft Simulix Parts > Does anybody know of an alternative supplier of parts for Oldelft Simulix > simulators? > I am in need of an Image Intensifier Longitudinal Drive Motor, vendor wants > an outrageous price AND can't deliver it for at least 2 weeks(!!). > The motor itself is an ENGEL Type D4420/4-0X4 (X is for number not visible; > label is obscured). Gearbox is ENGEL type G24. > Any suggestions? > > Tim Waldron > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Oldelft Simulix Parts Message-ID: <8625676A.0073E3BA.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: Oldelft Simulix Parts Date: Fri, 7 May 1999 13:10:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anybody know of an alternative supplier of parts for Oldelft Simulix simulators? I am in need of an Image Intensifier Longitudinal Drive Motor, vendor wants an outrageous price AND can't deliver it for at least 2 weeks(!!). The motor itself is an ENGEL Type D4420/4-0X4 (X is for number not visible; label is obscured). Gearbox is ENGEL type G24. Any suggestions? Tim Waldron ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Carrousel 60 fault Message-ID: <199905070852310250.08FB748B@dfw.scf.sk.ca> From: Scot Thiesson To: linac-eng@plato1.aristotle.net Subject: Carrousel 60 fault Date: Fri, 7 May 1999 06:52:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks to all who replied to this problem. The problem turned out to be a bad spot on the chain. When the calibration sequence was initiated most of the ports would verify, when the bad spot on the chain was by the pot/motor area it would cause the drive to jump slightly causing a mis calibration. It was NO FUN but we removed the chain and thoroughly cleaned it, even though it didn't look dirty, in an ultrasonic cleaner. Re-lubed it and verified that none of the links were binding. The servo system seems to be amazingly sensitive to this type of positional error and can't seem to compensate properly. It also gave erroneous error messages like a switch failure '60' code which didn't help matters much. If this was a un-computerized servo system we probably would have looked at the surging motion of the carrousel and said...'geez this chain is buggered!!' Live and learn. Scot Thiesson Allan Blair Cancer Centre Regina Sask. Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: STABILIPAN 250/2 PARTS Message-ID: <4be3cdaa.246383fa@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: STABILIPAN 250/2 PARTS Date: Thu, 6 May 1999 15:47:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" HELP !!! Does anyone have access to used parts for this old Stabilipan. Specifically I'm in need of the T 150 TRANSFORMER, however a salvaged CONTROL CABINET would be a beautiful thing !!!! Thanks in advance. Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel 60 fault Message-ID: From: Randy Niccolls To: linac-eng@plato1.aristotle.net, sthiesson@scf.sk.ca Subject: Re: Carrousel 60 fault Date: Thu, 6 May 1999 11:19:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable We have two 2100C s/n224 and s/n305 and changed Carrousel motors on = both machines after 3 years. They came out with a smaller but more torque = type replacement. We also had to change the carrousel PCB's to match the = motor requirements. Both 2100's were giving symptoms that the carrousel was struggling and binding up. After we replaced the motor, that fixed the problem. Cant remember if we were getting 60 faults or not. Good luck. =20 >>> "Scot Thiesson" 05/06/99 08:10AM >>> Carrousels 60 fault Regarding: a Varian Clinac 2100 C S/N 1015 commissioned June =E697. Good morning list. We have a problem with our carrousel calibration = that appears to be a problem with the gearhead/motor drive unit. The = calibration sequence brings up a 60 fault. All switches, wiring and circuitry on = the bmag carrousel board checks out. Here's the thing; in manual mode the carousel jerks quite a bit and the motor sounds like it is laboring at = one point in it's rotation. I suspect that this jerky movement is = simulating a switch failure. We have a new motor on order and are about to examine = the old one for defects. Has anyone noticed a high failure rate for these motors? Should the operation of the carousel be very smooth? (I suspect = so because of the voltage feedback pot) Also one other thing I noticed which is probably nothing, If you read = the book the PWM board leds should flash and then one of them should grow = dimmer as the function increases in speed. The carrousel drive leds stay = bright green all the time?? Scot Thiesson Allan Blair Cancer Agency Regina Sask. Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Carrousels 60 fault Message-ID: <199905061307250640.04BE7D72@dfw.scf.sk.ca> From: Scot Thiesson To: linac-eng@plato1.aristotle.net Subject: Carrousels 60 fault Date: Thu, 6 May 1999 11:07:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carrousels 60 fault Further information on the carousel fault. As mentioned before the assembly is spinning freely. The unit now seems to change with usage. What is the failure mode for the thermal fuses on the aux. Electronics backplane? They ohm out o.k. ...but they may be reset by the time I get my meter on them. I seem to recall other people have had 'fun' with these variable resistors. Also just a quick verification of the action of the switches: 16 and 8 operate ('click') between the divot and neither position. 1,2,4 operate between the neither and cam position. I believe this is correct. Scot Thiesson Allan Blair Cancer Agency Regina Sask. Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Recurring HWFA's Message-ID: <000501be97d8$eb474840$9a27d4ab@pwserver> From: Steve Schwarz To: woncspb@wnhealth.co.nz, linac-eng@plato1.aristotle.net Subject: RE: Recurring HWFA's Date: Thu, 6 May 1999 07:55:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Schaun, Your HWFA prob could be: stripped hardware on the primary pot/ gearing causing slippage, = secondary readout pot, A/D converter drift, the upper jaw wiring connector, chafed wire or = cable, it does sound difficult to pinpoint if its only happening once a month May not be your HWFA prob however your vintage of machine is prone to = upper ij slop - To verify if you have a mechanical jaw slop prob, place the = jaw to test @ midrange of travel; rotate the gantry to lateral & the = collimator so that the jaw is "hanging". keep an eye on your readouts for change. = If you see a change, depending on the version of op software you have ( I understand the spec widened with each version), the jaw movement may be = out of spec. To verify, a dial indicator with mag base will give you more accurate data. To correct, you can try checking the tightness of the jaw motor housing & the set screw. If no help there, we've been successful replacing the motor end worm gear to reduce the slop. In some extreme cases, replacement of the majority of the mechanical = components that drive the jaw were necessary. If I'm not mistaken, the vendor = has an "upgrade" for purchase that fixes the flaw in the jaw by replacing all = the gearing with tighter spec'd mechanics. Anybody ou there had this = upgrade done? Also, I don't think the individual motor end worm gear is available = anymore from the vendor; you have to buy a gear "kit". If you need anything we'd be glad to help if we can. Good Luck & My Regards, Steve Schwarz, sschwarz@Acceletronics.com In a message dated 5/5/99 6:43:35 PM Central Daylight Time, woncspb@wnhealth.co.nz writes: << Subj: Recurring HWFA's Date: 5/5/99 6:43:35 PM Central Daylight Time From: woncspb@wnhealth.co.nz (Shaun Baggarley) Sender: owner-linac-eng@plato1.aristotle.net To: linac-eng@plato1.aristotle.net Hi All, We have an upgraded 2100-C (#42) that has had a recurring Primary/2nd = cha mismatch HWFA fault on its Y1 collimator over the last few months. Our Varian engineer has changed the primary PRO pot 3 times and each = time we have had almost exactly one months respite from the HWFA's until they return again. Has anyone else experienced this sort of problem? Any thoughts or = possible solutions would be greatly appreciated. Thanks, Sh=E1un Baggarley ********************************************************* Sh=E1un Baggarley Ph: (+64 4) 3855837 Chief Physicist Fax: (+64 4) 3855984 Wellington Cancer Centre Email: woncspb@wnhealth.co.nz Wellington Hospital Private Bag 7902 Wellington 2 New Zealand >> ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Recurring HWFA's Message-ID: <199905061544.IAA14933@attos.bctel.net> From: Don Melsness To: linac-eng@plato1.aristotle.net, woncspb@wnhealth.co.nz Subject: RE: Recurring HWFA's Date: Thu, 6 May 1999 07:39:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Shaun, We, too, were plagued with recurring HWFA faults (both Y1 & Y2 jaws) = on our Varian machines here. Changing pots and re-calibrating seemed to fix the = problem for awhile, but after a month or so, it would rear its ugly head again. The HWFA = seemed to occur usually when the therapist was rotating the gantry or collimator. We finally discovered that there was a small amount of play in the worm = gear setup that drives the affected jaw. There is a small plate which , when removed, reveals the gear assembly (refer to Upper Coll drawing #882825, cross section B-B). By loosening the clamp, pushing the gears together and then re-tightening, the backlash = can be removed. Now, whenever we start getting intermittent y-jaw HWFA faults, we make = this adjustment first.....it usually fixes the problem. Regards, Don Melsness BC Cancer Agency Vancouver, BC, Canada ---------- =BBFrom: woncspb@wnhealth.co.nz =BBTo: linac-eng@plato1.aristotle.net =BBSubject: Recurring HWFA's =BBDate: Wednesday, May 05, 1999 4:34PM =BB =BBHi All, =BB =BBWe have an upgraded 2100-C (#42) that has had a recurring = Primary/2nd cha =BBmismatch HWFA fault on its Y1 collimator over the last few months. =BBOur Varian engineer has changed the primary PRO pot 3 times and each = time we =BBhave had almost exactly one months respite from the HWFA's until = they return =BBagain. =BBHas anyone else experienced this sort of problem? Any thoughts or = possible =BBsolutions would be greatly appreciated. =BB =BBThanks, =BB =BBSh=E1un Baggarley =BB********************************************************* =BBSh=E1un Baggarley Ph: (+64 4) 3855837 =BBChief Physicist Fax: (+64 4) 3855984 =BBWellington Cancer Centre Email: woncspb@wnhealth.co.nz =BBWellington Hospital =BBPrivate Bag 7902 =BBWellington 2 =BBNew Zealand =BB ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel 60 fault Message-ID: <3731B3AE.CF920396@scf.sk.ca> From: Scot Thiesson Reply-To: sthiesson@scf.sk.ca To: Accelinear@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Carrousel 60 fault Date: Thu, 6 May 1999 07:22:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The carousel moves freely without the motor connected. The motor runs freely without the carousel connected. The surging occurs only when everything is together. I have checked the torque output of the motor. It is good. This now appears to be a velocity/position/feedback thing from the pot. Of course I don't have a pot :( Accelinear@aol.com wrote: > > Have you tried to lubricate the bearing. Sounds as if you may have foreign > items restricting rotation. (Pieces of cable ties, metal turnings from > manufacture and such). Make sure that no lead is hitting the carousel or the > flattening filters. This can best be done by removing the lead near the > research port. This also the best place to lubricate the bearing (light oil > and light grease). > I don't think I've heard of one of the newer style motors failing. They don't > run very often or long. If it did fail, as its a DC motor, it would probably > just not run at all. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel 60 fault Message-ID: <87c81728.24630a60@aol.com> From: Accelinear@aol.com To: sthiesson@scf.sk.ca, linac-eng@plato1.aristotle.net Subject: Re: Carrousel 60 fault Date: Thu, 6 May 1999 07:08:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Have you tried to lubricate the bearing. Sounds as if you may have foreign items restricting rotation. (Pieces of cable ties, metal turnings from manufacture and such). Make sure that no lead is hitting the carousel or the flattening filters. This can best be done by removing the lead near the research port. This also the best place to lubricate the bearing (light oil and light grease). I don't think I've heard of one of the newer style motors failing. They don't run very often or long. If it did fail, as its a DC motor, it would probably just not run at all. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Carrousel 60 fault Message-ID: <199905060810260770.03AEC175@dfw.scf.sk.ca> From: Scot Thiesson To: linac-eng@plato1.aristotle.net Subject: Carrousel 60 fault Date: Thu, 6 May 1999 06:10:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carrousels 60 fault Regarding: a Varian Clinac 2100 C S/N 1015 commissioned June '97. Good morning list. We have a problem with our carrousel calibration that appears to be a problem with the gearhead/motor drive unit. The calibration sequence brings up a 60 fault. All switches, wiring and circuitry on the bmag carrousel board checks out. Here's the thing; in manual mode the carousel jerks quite a bit and the motor sounds like it is laboring at one point in it's rotation. I suspect that this jerky movement is simulating a switch failure. We have a new motor on order and are about to examine the old one for defects. Has anyone noticed a high failure rate for these motors? Should the operation of the carousel be very smooth? (I suspect so because of the voltage feedback pot) Also one other thing I noticed which is probably nothing, If you read the book the PWM board leds should flash and then one of them should grow dimmer as the function increases in speed. The carrousel drive leds stay bright green all the time?? Scot Thiesson Allan Blair Cancer Agency Regina Sask. Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Recurring HWFA's Message-ID: <85256769.004D53D3.00@mail.lrcc.on.ca> From: btonks@lrcc.on.ca To: woncspb@wnhealth.co.nz, linac-eng@plato1.aristotle.net Subject: Re: Recurring HWFA's Date: Thu, 6 May 1999 06:04:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had a 2100C that was upgraded and ran into the same problem but ours had a new lower independant collimator added. I found that the secondary pot was drifting so I replaced it and it was still drifting , upon closer inpection Varian had swapped the primary/secondary wiper connections. I swapped them back and replaced the primary pot and that took care of it. Its great when Varian builds in challenges. Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Recurring HWFA's Message-ID: <373199A8.6FCECB7A@yale.edu> From: "Peter E. Vitali" To: Shaun Baggarley Cc: "Linac-Engineers, Listserver" Subject: Re: Recurring HWFA's Date: Thu, 6 May 1999 05:31:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Shaun: I am assuming that you went into the HEX screen in the service mode and determined that it was the Y1 Jaw that was causing the problem. Then I am assuming that every time you recalibrated the Y1 Jaw you printed out the calibration screen. If you have, then by comparing the calibration raw numbers for each calibration position you may be able to determine which pot is the culprit. Doing this over time we were able to see which pot's numbers had the greatest excursions and this narrowed it down to whether it was in the primary or secondary readout. We then replace the pot giving the problem. Problem was it wasn't the pot but the wiring from the pot to the main harness connection J2. You say that the machine has been upgraded. What was the upgrade? If it was to the New Accessory Mount (Version 3), the mount has been upgrade but the wiring in the collimator may not have been. Therefore, you may have the old 28 to 40 strand wire. It is very flexible but it does break. When it breaks it breaks strand by strand, usually some where in the middle of the wire or where you have tye raps. The resistance of the wire changes enough which show up as HWFA interrupts because the readout value has changed compared to the other readout. You have to cut all the tye raps and then pull on the wire from both ends. Where the insulation collapses is where the break is. It took us 6 months to find this one. At the time the problem started our machine was 7 years old. It's serial number is 228. You may have to get this wire from Varian since I have not seen it in any of my catalogs. They have a replacement cable but it is expensive. The cable number is Varian part #877365-01. It comes complete with switches and J2 connector. I found it on the Schematics for the Upper Collimator Assembly 880065, page 3 of 3, page 3-5 in section 6 of the Data Book. In this group of schematics you can also find the part numbers for the various wires in the cable. If they upgraded you to the new wiring, then the problem may be as one of the other engineers has stated in the little P.C. board near the Jaw motor. Saw that one on our 2100C 408. Hope this helps. Peter E. Vitali Therapeutic Radiological Engineer. Yale-New Haven Hospital U.S.A. E-Mail: peter.vitali@yale.edu Phone: USA (203) 688-2948 FAX: USA (203) 688-3663 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1EB2C38D998ED211B83400805F853AFE081E43@europa.emh.org> From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Date: Thu, 6 May 1999 05:00:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" You can seperate the mechanics from the electronic technicians when you use the word zerk...... A zerk is a grease fitting. Mike ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re zerks Message-ID: <4510ED9293BFD1119D280008C7280D626B11E2@ex1.gstt.sthames.nhs.uk> From: Richard.Newby@gstt.sthames.nhs.uk To: linac-eng@plato1.aristotle.net Subject: re zerks Date: Thu, 6 May 1999 04:30:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks guys. Never heard a grease nipple called that before! Rick ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: zerks Message-ID: <003c01be97b1$1b0b8d20$39c6d6d8@whoknows> From: Richard Kimball To: Richard.Newby@gstt.sthames.nhs.uk, linac-eng@plato1.aristotle.net Subject: Re: zerks Date: Thu, 6 May 1999 03:10:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" >From Merriam-Webster Online: Main Entry: zerk Pronunciation: 'z&rk Function: noun Etymology: Oscar U. Zerk died 1968 American (Austrian-born) inventor Date: 1926 : a grease fitting > ok I give in. What's a zerk???? > > Rick ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: zerks Message-ID: <4510ED9293BFD1119D280008C7280D626B11E0@ex1.gstt.sthames.nhs.uk> From: Richard.Newby@gstt.sthames.nhs.uk To: linac-eng@plato1.aristotle.net Subject: zerks Date: Thu, 6 May 1999 01:32:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ok I give in. What's a zerk???? Rick ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Recurring HWFA's Message-ID: <00BE56E17E26D11197CB00805FA6803A010CA940@210-55-172-67.ipnets.xtra.co.nz> From: Keith Croft To: 'LinacEng' Subject: RE: Recurring HWFA's Date: Wed, 5 May 1999 20:48:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Yes we have had this very same problem - except on a 600C. You may = remember I mentioned this on the linac group before - and lots of other also = then pointed out they too had the very same problem. I think.. not too = certain tho', that the problem is not with the pots but the interface card = where all the ribbon cables goto on the gantry. We removed the connection from = the board, cleaned it, and resoldered it back. Since then this problem has = not reoccurred. Previously we too changed the pots, chased around for poor connection = on the collimator assembly etc. I do not think we ever really proved what the = cause was. Only that we haven't seen this problem again. Since then we had a quad op-amp fail on the motor controller board - = which took out the 10V regulator. This killed the POS+ & - supply, which then killed the position readouts, for the collimator. Do not know if this = would have been related to the earlier events. Keith Croft. Palmerston North Hospital, About 2 hours drive up the road from the sender below. -----Original Message----- From: woncspb@wnhealth.co.nz [mailto:woncspb@wnhealth.co.nz] Sent: Thursday, May 06, 1999 11:34 AM To: linac-eng@plato1.aristotle.net Subject: Recurring HWFA's=20 Hi All, We have an upgraded 2100-C (#42) that has had a recurring Primary/2nd = cha mismatch HWFA fault on its Y1 collimator over the last few months. Our Varian engineer has changed the primary PRO pot 3 times and each = time we have had almost exactly one months respite from the HWFA's until they = return again. Has anyone else experienced this sort of problem? Any thoughts or = possible solutions would be greatly appreciated. Thanks, Sh=E1un Baggarley ********************************************************* Sh=E1un Baggarley Ph: (+64 4) 3855837 Chief Physicist Fax: (+64 4) 3855984 Wellington Cancer Centre Email: woncspb@wnhealth.co.nz Wellington Hospital Private Bag 7902 Wellington 2 New Zealand ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 8514 Video Adapter Message-ID: <3730890D.877EE917@yale.edu> From: "Peter E. Vitali" To: Oktay Ureten Cc: linac-eng@plato1.aristotle.net Subject: Re: 8514 Video Adapter Date: Wed, 5 May 1999 10:09:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Oktay: The card is is called 8514/A Display Adapter PS/2. Varian Drawing #884108. It should be a Micro Channel card since the PS/2 70 is an IBM micro channel computer. If you are using a different computer, then it would be ISA or EISA type board. Look at the cable ends and make sure that there is no broken wire or ground. If this is the 5 wire coax then there are 5 to 6 grounds. Loss of one of the grounds can cause weird problems. Hope this helps Pete Vitali Therapeutic Radiological Engineer Yale-New Haven Hospital USA E-Mail: peter.vitali@yale.edu Phone: (203) 688-2948 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 8514 Video Adapter Message-ID: From: Radsrus@aol.com To: Oktay.Ureten@science.ankara.edu.tr, linac-eng@plato1.aristotle.net Subject: Re: 8514 Video Adapter Date: Wed, 5 May 1999 07:49:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Oktay, You should be able to find that card off the shelf - If the MB in the R/V computer does have onboard video, you can use a video amp/splitter (one cable in, 2 out), routing the cables to your video switches. OR you can buy an add on video adapter with two outputs and handle it that way. We've had better success with the amp/splitters, especially for long cable runs. If you have trouble finding what you need, call or email & we can help you out. Good Luck & My Regards, Steve Schwarz, Acceletronics 800-626-8704 847-735-8338 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re:ETR lift actuator Message-ID: <199905051000.FAA18118@plato1.aristotle.net> From: Paul Twyman To: linac-eng@plato1.aristotle.net Subject: re:ETR lift actuator Date: Wed, 5 May 1999 02:55:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This sounds familiar. Only yesterday I had the same problem and I tried to grease the assy. I removed the black cap at the rear of the couch and attached the grease gun. After a couple of squirts I pulled the gun off and the shaft came out of the couch leaving the bevel gear. Upon closer inspection I realised that the key was missing between the shaft and gear and that the gear had been rotating on the shaft for some time. I never did find the key. Paul Twyman. MTO4 Addenbrookes hosp. Cambridge. England. Paul Twyman Technical officer Medical physics dept Box 152 Addenbrookes hosp Hills road Cambridge CB2 2QQ England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: AW: 600c dropping ETR base (s/n 189) Message-ID: From: "Seelentag Wolfhart Dr. KSSG_RO" To: linac-eng@plato1.aristotle.net, "'RvrRtMark@aol.com'" Subject: AW: 600c dropping ETR base (s/n 189) Date: Wed, 5 May 1999 00:26:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Mark, we used to have the problem in the good old days : happens only when your actual gantry angle is "identical" with the proposed angle to start the action - small variations in gantry angle display may trigger the warning. Solution : set the warning angle to 58 degrees (which - unlike 60 - is not a common angle for actual fields), and you get rid of your problem. Good luck - Wolf -------------- Wolf W. Seelentag, PhD, e-mail : wolf.seelentag@kssg.ch Klinik fuer Radio-Onkologie, Kantonsspital, CH - 9007 St. Gallen, Switzerland Tel : +41-71-4942233 Fax : +41-71-4942893 > ---------- > Von: RvrRtMark@aol.com[SMTP:RvrRtMark@aol.com] > Gesendet: Dienstag, 4. Mai 1999 05:20 > An: linac-eng@plato1.aristotle.net > Betreff: 600c dropping ETR base (s/n 189) > > Hello Again, > Do any of you have the type of ETR base on a 600C that > drops as the gantry approaches 60 degrees or 300 degrees? This is the > type > that makes a whistling sound just before it sinks into the base of the ETR > > turntable to accommodate the gantry. > We don't have good documentation on this part so here's what's > going > on. The whistle is going off as if it was at the triggering angle while > beamed on at times (not when it is at 0 degrees in the lowered state). > Something is triggering the tone only while beamed on for some reason. > The > ground connections were a recent problem, I have checked them today and > they > appear to be OK. I calibrated the gantry PRO so that seems to be ruled > out. > I'm thinking the sensing circuitry for this could be a problem. Has > anybody > seen this before or know where this sensing circuitry is? > Thanks, > Mark Brideson > RAS > Sacramento, Ca. > USA > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 8514 Video Adapter Message-ID: From: Oktay Ureten Reply-To: Oktay Ureten To: linac-eng@plato1.aristotle.net Subject: 8514 Video Adapter Date: Wed, 5 May 1999 07:22:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, I have a problem with our in-room monitor which is connected to RMS-2000 system. When we switch to console monitor, we have no problem with the in-room monitor (for example when we want to see service mode screen from inside the room). But, when we switch to RMS monitor, we have a fuzzy image on the in-room monitor and we can hardly see the characters on the screen. I think that the problem is coming from the 8514 Video adapter that is inside the RMS computer. Is this a special hardware from Varian or is it possible to find it in old computer stores? Many thanks, Oktay Ureten ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch lift acctuator Message-ID: <002a01be9696$5f8a1be0$92a199d1@default> From: "Jeffrey L. Cressman" To: linac-eng Subject: Re: ETR couch lift acctuator Date: Tue, 4 May 1999 17:26:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I agree with our friend from Accelinear. If your ETR couch can be hand cranked from a fitting at its base, then there is additional gearing for this. These gears have zerks by them. If these gears get to "dry" they will generate excessive noise. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mystery crash Message-ID: <84f21029.2460bbe7@aol.com> From: RvrRtMark@aol.com To: ACCELINEAR@prodigy.net, linac-eng@plato1.aristotle.net Subject: Re: Mystery crash Date: Tue, 4 May 1999 13:08:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had a very similar problem to yours. It turned out to be the main breaker going bad. This is the one that is part of the "two man start." Some of the breakers on the primary power on the 3 phase 208 can be a problem as well. Good luck. Mark Brideson RAS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch lift acctuator Message-ID: <3d49f453.2460ab8b@aol.com> From: Accelinear@aol.com To: MLancaster@aol.com, linac-eng@plato1.aristotle.net Subject: Re: ETR couch lift acctuator Date: Tue, 4 May 1999 11:59:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Grease the bearing. Just remove the black plastic cover plate off the back of the bottom of the table and get on the zerk fitting. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch lift acctuator Message-ID: <372F46A9.C4361346@wfubmc.edu> From: Tim Cullen To: MLancaster@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: ETR couch lift acctuator Date: Tue, 4 May 1999 11:12:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, the screw, and the whole actuator assy can give various noises due to lack of grease. But if you have it properly greased then I would check the aluminum gear on the motor shaft, the one the belt rides on, to make sure it is aligned properly and the set screw has not backed out. You can also use a dial indicator to check the runout on the screw. Bearings can be tricky to find in stock somewhere local, especially the metric ones but if there is a bearing supply house nearby you could run the sizes by them. If the motor is only 6 months old it would lead one to believe it is an alignment problem left over from the motor replacement. good luck _____ MLancaster@aol.com wrote: I have a couch which makes a lot of noise when lowering or raising. The noise seems to come from the bottom bearing but it's not definite. It does not seem to be the screw and there are no abnormal indications of wear such as shavings. The motor is only about 6 months old so I think it can be ruled out. Varian wants about $9700 for the entire actuator assembly. Have any of you had any success in finding the parts and "rebuilding" one of these actuators? Thanks, Mike Lancaster OMS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: ETR couch lift actuator Message-ID: <1EB2C38D998ED211B83400805F853AFE081E3E@europa.emh.org> From: "Denning, Mike" To: "'MLancaster@aol.com'" , "Linac-eng (E-mail)" Subject: RE: ETR couch lift actuator Date: Tue, 4 May 1999 10:19:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had an old PSA couch a few years ago that had a similar problem. It would also bind and cause the couch to drop a few inches (the weight switches on the ball drive shafts were not opening). The lower rollers on the scissors had backed out and were binding on the side of the base track assy. We found that the bearing shafts had not been drilled to allow the set screws to hold the bearing in place. The PSA couch is quite a bit different from the ETR couch, but I think a look how the lower bearings are tracking might be in order. Mike Denning Cancer Care of Maine > -----Original Message----- > From: MLancaster@aol.com [SMTP:MLancaster@aol.com] > Sent: Tuesday, May 04, 1999 12:37 PM > To: linac-eng@plato1.aristotle.net > Subject: ETR couch lift acctuator > > I have a couch which makes a lot of noise when lowering or raising. The > noise > seems to come from the bottom bearing but it's not definite. It does not > seem > to be the screw and there are no abnormal indications of wear such as > shavings. The motor is only about 6 months old so I think it can be ruled > out. > > Varian wants about $9700 for the entire actuator assembly. Have any of you > > had any success in finding the parts and "rebuilding" one of these > actuators? > > Thanks, > Mike Lancaster > OMS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR couch lift acctuator Message-ID: <9853b44e.24608df9@aol.com> From: Radsrus@aol.com To: MLancaster@aol.com, linac-eng@plato1.aristotle.net Subject: Re: ETR couch lift acctuator Date: Tue, 4 May 1999 09:52:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Acceletronics has a rebuilt lift assy in stock. The assy. has been field tested, comes without a motor and a core return is required. The price is significantly less that what you mentioned. If you'd like more information, please give us a call at 800-626-8704. My Regards, Steve Schwarz, Acceletronics ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: ETR couch lift acctuator Message-ID: From: MLancaster@aol.com To: linac-eng@plato1.aristotle.net Subject: ETR couch lift acctuator Date: Tue, 4 May 1999 08:36:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a couch which makes a lot of noise when lowering or raising. The noise seems to come from the bottom bearing but it's not definite. It does not seem to be the screw and there are no abnormal indications of wear such as shavings. The motor is only about 6 months old so I think it can be ruled out. Varian wants about $9700 for the entire actuator assembly. Have any of you had any success in finding the parts and "rebuilding" one of these actuators? Thanks, Mike Lancaster OMS ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Fw: Mystery crash Message-ID: <85256767.00579FF4.00@mail.lrcc.on.ca> From: rmcvittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Re: Fw: Mystery crash Date: Tue, 4 May 1999 07:57:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have never worked on an 1800 but I have worked on 4/100, 600c and 2100's I had a Clinac 4/100 several years ago that gave me grief like this for a couple of weeks. It turned out that the Over Temp switch was going open circuit intermittently dropping the machine to Emergency Off. A problem with your 24v power supply or short in the 24v line somewhere Have a good look at all of your wiring of the 24v chain throught the switches. Measure the voltage drop maybe you have a bad connection somewhere. Keep us posted. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mystery crash Message-ID: <372EE3E3.BCA9BFE2@wfubmc.edu> From: Tim Cullen To: KENNETH R WRIGHT Cc: Linac-Eng Subject: Re: Mystery crash Date: Tue, 4 May 1999 04:11:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kenneth, everybody knows that the useful life on masking tape is only about thirty minutes. The fact that she got a couple of 1hr uses out of it may be some kinda record :-) _____ KENNETH R WRIGHT wrote: Heard a good one the other day. Here's the deal... Varian Clinac-1800 Machine is found completely crashed in the morning. Starts normally and works for about 1 hr. While not in use, sitting idle, no one by the machine, it crashes all by itself. Restarts normally but then proceeds to crash, on it's own, about every 30 minutes or so. Sometimes Beamed ON, sometimes not. Even occurs in STBY. Any idea's ? Oh, one more thing: All of the Modulator and Stand Emergency Off switches are pushed in and the therapist is using the standard Rad Onc quality masking tape to hold the "Start" button in ! (Anybody out there looking for a good RTT ?) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mystery crash Message-ID: <19990504063529.9418.rocketmail@send205.yahoomail.com> From: michael porat To: Linac-Eng@plato1.aristotle.net Subject: Mystery crash Date: Mon, 3 May 1999 22:35:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kenneth, I would suspect the 24VDC P.S. in the P.S. Assy by the Cardrack. If this one fails for a moment, you will get an immmediate crash. From: SMcna39074@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Fw: Mystery crash Date: Mon, 3 May 1999 21:06:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In a message dated 5/3/99 8:06:06 PM Pacific Daylight Time, cresskik@voyager.net writes: 1800 crashes for no reason. You might look and see what the internal water temperature is. If the Barbar-Colman controller quits, or the thermocouple fails open and the machine OT's you can get this condition too. Stan@cfsb.org ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Update on 60 degree En. dynamic wedge Message-ID: From: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: Update on 60 degree En. dynamic wedge Date: Mon, 3 May 1999 19:21:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everybody, Thanks to all who posted on the problem I posted a few weeks ago with the MFIL fault with the 60 degree Enhanced Dynamic Wedge. It turned out to be the EDW STT files being corrupt. I got confirmation from Varian on this. The fun begins when we upgrade to 5.4 soon. Happy Hunting, Mark Brideson RAS Sacramento, Ca. USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600c dropping ETR base (s/n 189) Message-ID: <4dec8956.245fc16f@aol.com> From: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: 600c dropping ETR base (s/n 189) Date: Mon, 3 May 1999 19:20:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Again, Do any of you have the type of ETR base on a 600C that drops as the gantry approaches 60 degrees or 300 degrees? This is the type that makes a whistling sound just before it sinks into the base of the ETR turntable to accommodate the gantry. We don't have good documentation on this part so here's what's going on. The whistle is going off as if it was at the triggering angle while beamed on at times (not when it is at 0 degrees in the lowered state). Something is triggering the tone only while beamed on for some reason. The ground connections were a recent problem, I have checked them today and they appear to be OK. I calibrated the gantry PRO so that seems to be ruled out. I'm thinking the sensing circuitry for this could be a problem. Has anybody seen this before or know where this sensing circuitry is? Thanks, Mark Brideson RAS Sacramento, Ca. USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fw: Mystery crash Message-ID: <002001be95d9$637052a0$0ba199d1@default> From: "Jeffrey L. Cressman" To: linac-eng Subject: Fw: Mystery crash Date: Mon, 3 May 1999 18:54:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Jeffrey L. Cressman To: KENNETH R WRIGHT Date: Monday, May 03, 1999 10:50 PM Subject: Re: Mystery crash First of all when you said all E sw's "pushed in" I take it you wanted to say pulled out as in NOT tripped. Next In response to your problem: Most likely has nothing to do with the actual CL1800 itself. The problem is the main line sensing circuit breaker for incoming power is getting "soft". The breaker will trip unpredictably with greater and greater frequency until you find yourself one day soon unable to reset it. I know, been there done that. Best to replace the breaker ASAP. P.S. You could jumper all the E sw's & glue the START button in and your CL1800 will still go to emergency off if the main CB is soft. -----Original Message----- From: KENNETH R WRIGHT To: Linac-Eng Date: Monday, May 03, 1999 6:25 PM Subject: Mystery crash Heard a good one the other day. Here's the deal... Varian Clinac-1800 Machine is found completely crashed in the morning. Starts normally and works for about 1 hr. While not in use, sitting idle, no one by the machine, it crashes all by itself. Restarts normally but then proceeds to crash, on it's own, about every 30 minutes or so. Sometimes Beamed ON, sometimes not. Even occurs in STBY. Any idea's ? Oh, one more thing: All of the Modulator and Stand Emergency Off switches are pushed in and the therapist is using the standard Rad Onc quality masking tape to hold the "Start" button in ! (Anybody out there looking for a good RTT ?) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mystery crash Message-ID: <01be95aa$60bb0200$b7d52581@oem773> From: KENNETH R WRIGHT To: Linac-Eng Subject: Mystery crash Date: Mon, 3 May 1999 13:17:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Heard a good one the other day. Here's the deal... Varian Clinac-1800 Machine is found completely crashed in the morning. Starts normally and works for about 1 hr. While not in use, sitting idle, no one by the machine, it crashes all by itself. Restarts normally but then proceeds to crash, on it's own, about every 30 minutes or so. Sometimes Beamed ON, sometimes not. Even occurs in STBY. Any idea's ? Oh, one more thing: All of the Modulator and Stand Emergency Off switches are pushed in and the therapist is using the standard Rad Onc quality masking tape to hold the "Start" button in ! (Anybody out there looking for a good RTT ?) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: LH0023CG INTEGRATED CIRCUIT Message-ID: <01be95a9$29d09620$b7d52581@oem773> From: KENNETH R WRIGHT To: GARRYANGEL@aol.com, linac-eng@plato1.aristotle.net Subject: Re: LH0023CG INTEGRATED CIRCUIT Date: Mon, 3 May 1999 13:08:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gary, You can get these from Mike Manske at Lead Electronics, Inc 8370 Thompson Rd. Cicero, NY 13039 315-699-6099 They'll run you a hefty $39.66 each though. He says it'll take 3-4 days UPS. Good Luck, Ken Wright -----Original Message----- From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Date: Monday, May 03, 1999 3:45 PM Subject: re: LH0023CG INTEGRATED CIRCUIT >Hi Everyone: > >I'm looking for LH0023CG integrated circuit chips for the va 6/100 TIMER AND >SYNC PCB's. National Semi indicates it's an obsolete IC and we have been >unable to locate the items from normal sources. Any assistance would be >appreciated. > >Thanks in advance... > >Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re: LH0023CG INTEGRATED CIRCUIT Message-ID: <9d4a4d11.245f4a9c@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: re: LH0023CG INTEGRATED CIRCUIT Date: Mon, 3 May 1999 10:53:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone: I'm looking for LH0023CG integrated circuit chips for the va 6/100 TIMER AND SYNC PCB's. National Semi indicates it's an obsolete IC and we have been unable to locate the items from normal sources. Any assistance would be appreciated. Thanks in advance... Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: IND JAW PROBLEM CL1800 Message-ID: From: "Williams, Rod" To: "'linac-eng@plato1.aristotle.net'" Subject: IND JAW PROBLEM CL1800 Date: Mon, 3 May 1999 06:32:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all whom may be interested, my problem with my excessive play in my Ind jaws when in the 0 region turned out to be a alignment . R8 on board B8 tighten up the 0 region ,R10 offset for lower jaw setting R7 gain for upper jaw settings both on board B6. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Field Engineer positions avail in FLA! Message-ID: From: Accelsvc@aol.com To: linac-eng@plato1.aristotle.net Cc: resume@accelservice.com Subject: Field Engineer positions avail in FLA! Date: Sat, 1 May 1999 14:09:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" COME AND JOIN OUR TEAM IN FLORIDA! ACCEL Service Company has openings for experienced linear accelerator/simulator engineers in the Ft. Lauderdale, FL and Tampa, FL areas. Successful candidates will be Customer Service oriented, highly motivated professional Field Service Engineers with the latest systems training/experience. Experience with a combination of Siemens, Philips/Elekta, Oldelft, CT/MRI and Varian equipment a plus. ACCEL Service Company offers an excellent salary & benefits package and provides an excellent team - working environment. Come and enjoy all Florida has to offer - and come join our growing company that has the capabilities, resources and commitment to provide Florida's Radiotherapy community with the finest Service available. Please send your resume to: ACCEL Service Company, HR Dept., 400 Gordon Drive, Suite 602, Exton, PA 19341 OR email your resume to: resume@accelservice.com OR fax them to (847) 735-0087. All information sent will be held in the strictest confidence. ACCEL is an equal opportunity employer - All qualified people are encouraged to apply. We look forward to hearing from you!! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: CL-2500's in service Message-ID: <05AA132B9483D111A90100805FA700B601E7E85B@uihc-mail1.uihc.uiowa.edu> From: "Schebler, Joe" To: "'linac-eng@plato.aristotle.net'" Subject: CL-2500's in service Date: Thu, 29 Apr 1999 21:00:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We still have one in service Univ of Iowa Hospital CL-2500 s/n 18 installed in 1986 also I know Omaha Neb has one in service still, How about CL-4's? I too would be interested in the results of this survey/inquiry would you please post it when all data is in? Thanks Joe Schebler ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Clinac 2500 Message-ID: From: Jim Danz To: linac-eng@plato1.aristotle.net Subject: Varian Clinac 2500 Date: Thu, 29 Apr 1999 06:16:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, I am gathering preliminary data to use in the process of replacement justification for our Clinac 2500 sn#15. It is my understanding that not many were made, and of those, not many remain in use. If you have a 2500, or know of one I would be thankful if you would E-mail me with serial number, age, location, and status. Thanks Jim Danz Radiology + Linac Engineer New England Medical Center Boston Mass. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: iND JAW QUESTION ON cl 1800 Message-ID: From: "Williams, Rod" To: "'linac-eng@plato.aristotle.net'" Subject: iND JAW QUESTION ON cl 1800 Date: Wed, 28 Apr 1999 10:06:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to the group. I have a question on a 1800, when in Ind jaw mode and jaws 1 or 2 enter into the 0 region and 2mm into each others region their seems to be to much slop in the digital readout verses the mech movement.I don't know what the spec is but Iam getting about 3mm to4mm of mech movement when the Digital's for jaw 1, 2 are reading 0. At all other jaw readings everything looks good. I don't have alignment procedures for Ind jaws. Any comments would be appreciated Thanks Rod. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: pendant enclosures Message-ID: From: Kerry Clark To: "'linac-eng@plato.aristotle.net'" Subject: pendant enclosures Date: Mon, 26 Apr 1999 13:53:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, I'm new to the list. Is it just us or is anyone else finding the plastic screw holes on Varian pendant enclosures are wearing/cracking/failing prematurely? On the same idea our year old couch end panels are doing the same thing around the screw holes in its central locating block, has any one else dealt with this? thanks. Kerry Clark Engineering Technician Auckland Hospital (09) 307-4949 ext 6213 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Cl.2300 EA touchguard Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB3E1@liosex1.lio.se> From: Viking Eilert To: "'Accelinear@aol.com'" , linac-eng@plato1.aristotle.net Subject: SV: Cl.2300 EA touchguard Date: Mon, 26 Apr 1999 05:11:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable We have measured almost the same voltage drop on our 2100C #248, so it seems to be normal, (but not nice). When the LM311 is getting old = they seems to be much more sensitive for the voltage drop and new one=B4s = will fix the problem. abbreviations: IM =3D interface mount =3D wedge mount (fits on collimator) AM =3D accessory mount (fits on IM) EA =3D electron applicator (fits on AM) Eilert Viking AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA I'm not sure if I'm understanding the problem here with all the=20 abbreviations. If I understand the problem correctly it is an electron=20 applicator collision interlock on Varian type III accessories. =20 If that is indeed the case, the most common cause of these problems is a=20 leaky LM-311 op amp. While changing the op amp will correct the problem in=20 the short term a permanent fix is to install 10 meg ohm resistors in place of=20 the missing D13 and D15 zener diodes on the pod board in each electron=20 applicator. The zeners were designed to create a set trip point for the=20 collision sensor. For some reason the diodes were never installed in manufacturing. When the LM 311 starts to leak the trip point elevates to=20 crate a fault condition. The 10 meg resistor allows this leakage to bleed=20 down without affecting the sensitivity or trip point of the collision sensor. If the problem is something other than as stated above would the original=20 author be so kind as to restate the problem without abbreviations. Thank you. Accelinear@aol.com AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Hello list-eners, We do have intermittend problems on our Cl2300 C3 machine with the EA touchguard. During setup and treatment now and then the FSR trips. The problem occurs with all EA's. We checked the 12V power and found it 9,5V with AM & EA attached. Quite a bit low we think. Under this conditions the voltage at Aux.backplane it is 11,2V=20 and the source voltage (pin 1@PS1 stand) 12,17V. Without EA & AM the voltage at the IM is 11,0V,=20 @ aux.el. backplane 11,6V and @ PS1stand 12,18V As you see pretty large voltagedrops under all conditions, while the PS is OK The question: is this normal behavior or is this the cause of our touchguard problems. In advance: Thanks for your reply and have a nice weekend. Keesjan de Bruijne ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Cl.2300 EA touchguard Message-ID: From: Accelinear@aol.com Reply-To: Accelinear@aol.com To: kurtkn@CancerBoard.ab.ca, CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: Cl.2300 EA touchguard Date: Sat, 24 Apr 1999 18:06:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm not sure if I'm understanding the problem here with all the abbreviations. If I understand the problem correctly it is an electron applicator collision interlock on Varian type III accessories. If that is indeed the case, the most common cause of these problems is a leaky LM-311 op amp. While changing the op amp will correct the problem in the short term a permanent fix is to install 10 meg ohm resistors in place of the missing D13 and D15 zener diodes on the pod board in each electron applicator. The zeners were designed to create a set trip point for the collision sensor. For some reason the diodes were never installed in manufacturing. When the LM 311 starts to leak the trip point elevates to crate a fault condition. The 10 meg resistor allows this leakage to bleed down without affecting the sensitivity or trip point of the collision sensor. If the problem is something other than as stated above would the original author be so kind as to restate the problem without abbreviations. Thank you. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Cl.2300 EA touchguard Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Cl.2300 EA touchguard Date: Fri, 23 Apr 1999 06:10:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello list-eners, We do have intermittend problems on our Cl2300 C3 machine with the EA touchguard. During setup and treatment now and then the FSR trips. The problem occurs with all EA's. We checked the 12V power and found it 9,5V with AM & EA attached. Quite a bit low we think. Under this conditions the voltage at Aux.backplane it is 11,2V and the source voltage (pin 1@PS1 stand) 12,17V. Without EA & AM the voltage at the IM is 11,0V, @ aux.el. backplane 11,6V and @ PS1stand 12,18V As you see pretty large voltagedrops under all conditions, while the PS is OK The question: is this normal behavior or is this the cause of our touchguard problems. In advance: Thanks for your reply and have a nice weekend. Keesjan de Bruijne ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fw: Varian PC's Message-ID: <002d01be8d1e$c96187a0$4caea2cd@Pwwblaine> From: wwblaine To: linac-eng@plato1.aristotle.net Subject: Fw: Varian PC's Date: Thu, 22 Apr 1999 16:18:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have just upgraded our Varian 2100CD to version 5.4 S/W as part of our Y2K readiness program. Cost $13,200.00 and was completed by Varian. Our facility has a replacement budget for Y2K and IS paid for the upgrade. Who says Information Service isn't useful at times. I retained the Dell 486 computer our system came with after the rep formatted the HD. We are T&M customers. It's available if anyone wants to make an offer. Wayne Blaine ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 60 deg. Enhanced Dynamic Wedge problem Message-ID: From: RvrRtMark@aol.com Reply-To: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: 60 deg. Enhanced Dynamic Wedge problem Date: Wed, 21 Apr 1999 16:33:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, We have a 600c (s/n 330) with 5.2 software that crashes to standby sometimes when in the 60 degree enchanced dynamic wedge mode. The strange thing is that 60 degree function is the only one that does this. The machine beams on, give about 10mu then shuts down to standby giving an MFIL fault. The magnetron has given no problems and the filaments and current are at a good level. The machine has been trouble free over the past few months until now. Our Physics department is currently collecting data for the clinical use of this feature, so it is new to us. Has anyone else had this happen before? Thanks in advance, Mark Brideson RAS Sacramento, Ca. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: IBM PS2 Message-ID: <86256759.007E456D.00@HEIAISAS08.aurora.org> From: Dale Dornacker To: linac-eng@plato1.aristotle.net Subject: IBM PS2 Date: Tue, 20 Apr 1999 11:53:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We upgraded 3 linacs to the Dell PC's and kept all old components including the IBM PS2 computers. Varian uses the old computers for parts and sells them to other customers. Dale ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: IBM PS2/70 Message-ID: From: "Hall, Will" To: LINAC-ENG@plato1.aristotle.net Subject: RE: IBM PS2/70 Date: Tue, 20 Apr 1999 11:47:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I recently upgraded my CL-2100C and CL-600C's to 5.4 from 3.4, and had the PS2's replaced with Dell's also. My Varian rep. told me that, since, as a paid service customer, with no service contracts, we had paid for the upgrades, and that we could do with the PS2's as we liked. He took the softlock key off of the back and left them with me. I've had them both stacked in my office for months now. As to using them as spares. That can't be done easily. The PS2's won't run the 5.4 software, and there were hardware changes on the STD bus that would have to be changed back to enable 3.4 to run again. This is impossible now since my Varian rep. threw the old proms on the ground and stomped on them as per the instructions in the mod. which said to "destroy" the old proms. Will Hall Mary Bird Perkins Cancer Center Baton Rouge La. 225-215-1122 -----Original Message----- From: Tim Cullen [SMTP:tcullen@wfubmc.edu] Sent: Tuesday, April 20, 1999 7:41 AM To: LINAC-ENG@plato1.aristotle.net Subject: Re: IBM PS2/70 So I guess the Varian people telling me they had to have the PS2 back was BS then. I'm currently upgrading all four accelerators to ver 5.4 and DELL PC's. When asked about the PS2's, the local Varian office responded they had to have them back. If you read the fine print it says they remain the property of Varian. So my question is why? Why don't they just format C: and say do whatever you want with it(dumpster). Or are they planning on recycling them? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: IBM PS2/70 Message-ID: From: Doug Tymofichuk Reply-To: dougt@CancerBoard.ab.ca To: Tim Cullen Cc: LINAC-ENG@plato1.aristotle.net Subject: Re: IBM PS2/70 Date: Tue, 20 Apr 1999 05:21:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The story we were told is that parts are no longer available for these units, so Varian takes them back to scrap for spare hard drives, power supplies, etc. We have a stack of model 70 and 80 PS/2s left over from our old RMS system, they didn't want them back when we installed Varis. But when they upgraded our 6 linacs to Dells, they sent all six PS/2s back to the factory. Doug On Tue, 20 Apr 1999 08:41:24 -0400 Tim Cullen wrote: > So I guess the Varian people telling me they had to have > the PS2 back was BS then. I'm currently upgrading all four > accelerators to ver 5.4 and DELL PC's. When asked about the > PS2's, the local Varian office responded they had to have > them back. If you read the fine print it says they remain > the property of Varian. So my question is why? Why > don't they just format C: and say do whatever you want with > it(dumpster). Or are they planning on recycling them? > ---------------------- Doug Tymofichuk dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: IBM PS2/70 Message-ID: <371C75F4.53B42D43@wfubmc.edu> From: Tim Cullen To: LINAC-ENG@plato1.aristotle.net Subject: Re: IBM PS2/70 Date: Tue, 20 Apr 1999 04:41:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" So I guess the Varian people telling me they had to have the PS2 back was BS then. I'm currently upgrading all four accelerators to ver 5.4 and DELL PC's. When asked about the PS2's, the local Varian office responded they had to have them back. If you read the fine print it says they remain the property of Varian. So my question is why? Why don't they just format C: and say do whatever you want with it(dumpster). Or are they planning on recycling them? ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Hand Pendants? Message-ID: <199904200837.KAA11077@py.internet.sk> From: Jiri Bocanek To: Chris Coyle , linac-eng@plato1.aristotle.net Subject: Re: Hand Pendants? Date: Tue, 20 Apr 1999 03:30:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, the reason why you have so "strange" behaviour of the pendant is the new pendant and machine software. With software ver 5.x pendant "warns" technician, that during motion the "motion enable" was released, e.g. signal motion enable was interrupted. There is several reasons for this: 1. You may release one of the MEB's, both MEB's must be pressed. 2. Pendant cable has broken/damaged wires for motion enable ( most probable reason) signal. 3. there may be a problem with Pendant switch PCB, as Chris mentioned. Regards Jiri Bocanek AMEDIS Bratislava Slovakia >Replace the Pendant switch PCB. The part # is 01-102-050-03. The >new PCB has a switch, make sure it's in the Clinac position. I have >had 3 fail on a Clinac that is only 8 months old. Chris Coyle Swedish Tumor Inst. Seattle WA >hello chaps > >Can anyone shed any light on the following problem. >On our 2100c sn 687 version 5.2 we have a problem with the machine movements. >When operating a thumbwheel on any motion occasionally the movement stops and the leds go out on the thumbwheel leds except for the motion selected which flash either side of the thumbwheel. To clea>This seems to have happened since the pendants were upgraded with new software. > > >The Techs >North Staffs Oncology Centre >England _______________________________________________________________ Get Free Email and Do More On The Web. Visit http://www.msn.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: IBM PS2/70 Message-ID: <386b097a.244d34f5@aol.com> From: Accelinear@aol.com Reply-To: Accelinear@aol.com To: arminl@execpc.com, MEDPHYS@cwis-20.wayne.edu, LINAC-ENG@plato1.aristotle.net Subject: Re: IBM PS2/70 Date: Mon, 19 Apr 1999 17:40:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Why don't you keep the old PS2 as a well tested spare for an emergency? It doesn't take up much room and its programs are already loaded and ready to go. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Hand Pendants? Message-ID: <19990419191602.29685.qmail@hotmail.com> From: Chris Coyle To: tex@dial.pipex.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Hand Pendants? Date: Mon, 19 Apr 1999 11:16:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Replace the Pendant switch PCB. The part # is 01-102-050-03. The new PCB has a switch, make sure it's in the Clinac position. I have had 3 fail on a Clinac that is only 8 months old. Chris Coyle Swedish Tumor Inst. Seattle WA >From: "Radiotherapy Technicians" >Reply-To: "Radiotherapy Technicians" >To: >Subject: Hand Pendants? >Date: Fri, 16 Apr 1999 17:06:18 +0100 >MIME-Version: 1.0 >From owner-linac-eng@plato1.aristotle.net Fri Apr 16 11:20:23 1999 >Received: from [204.233.139.43] by hotmail.com (1.5) with SMTP id MHotMailB8E0CA2D0109D101707FCCE98B2BC06A0; Fri Apr 16 11:20:23 1999 >Received: by plato1.aristotle.net (8.9.0/8.9.0) id MAA09148for linac-eng-list; Fri, 16 Apr 1999 12:37:00 -0500 (CDT) >X-Authentication-Warning: plato1.aristotle.net: majordomo set sender to owner-linac-eng@plato.aristotle.net using -f >Received: from monsoon.dial.pipex.net (monsoon.dial.pipex.net [158.43.128.69])by plato1.aristotle.net (8.9.0/8.9.0) with SMTP id MAA09144for ; Fri, 16 Apr 1999 12:36:57 -0500 (CDT) >Received: (qmail 21046 invoked from network); 16 Apr 1999 16:11:05 -0000 >Received: from userk701.uk.uudial.com (HELO tech-office) (193.149.72.23)by smtp.dial.pipex.com with SMTP; 16 Apr 1999 16:11:05 -0000 >Message-ID: <001b01be8823$780b6c40$174895c1@tech-office> >X-Priority: 3 >X-MSMail-Priority: Normal >X-Mailer: Microsoft Outlook Express 4.72.2106.4 >X-MimeOLE: Produced By Microsoft MimeOLE V4.72.2106.4 >Sender: owner-linac-eng@plato1.aristotle.net >Precedence: bulk > >hello chaps > >Can anyone shed any light on the following problem. >On our 2100c sn 687 version 5.2 we have a problem with the machine movements. >When operating a thumbwheel on any motion occasionally the movement stops and the leds go out on the thumbwheel leds except for the motion selected which flash either side of the thumbwheel. To clear this we have to release the motion enable bars. When this happens in auto set-up we have to reselect auto to resume the movements. Sometimes the movement will stop just short of the target and if this is within the tolerance it will allow you to beam on. >This seems to have happened since the pendants were upgraded with new software. > > >The Techs >North Staffs Oncology Centre >England _______________________________________________________________ Get Free Email and Do More On The Web. Visit http://www.msn.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <9904191245551A.27508@www3.iname.net> From: fmertes@email.com To: linac-eng Subject: Date: Mon, 19 Apr 1999 08:45:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" All I say, is there must be some pretty bored service people out there if they need to count leaves in a photo. I just have a hard time trying to get a chance to read it. ----------------------------------------------- FREE! The World's Best Email Address @email.com Reserve your name now at http://www.email.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 120 leaf mlc Message-ID: <371B2DAF.266DDEB0@wfubmc.edu> From: Tim Cullen To: LINAC-ENG@plato1.aristotle.net Subject: Re: 120 leaf mlc Date: Mon, 19 Apr 1999 05:20:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yeah one of the physics people here brought this to my attention and you could see where he had used a pencil point to count each leaf. That's what I call being critical while making sure you're accurate. I talked to somebody at the factory about the sfbk pcb and it sounds like they are looking for another vendor for the pcb's. Hopefully this will solve their current problems. 120 leaves? I wonder if this one will be as "trouble free" as the 80 leaf? _____ Accelinear@aol.com wrote: Anybody have a close look at the last informational promo by VARIAN for the 120 leaf mlc? (MEDICAL IMAGING - April 99). The announcement about this wonderful technological innovation has all the hallmarks of a CONSUMERS UNION "selling it" article. While the subtitle on the picture states "VARIAN'S new Millenium-120 collimator" it is clearly apparent that the cute technician also appearing in the frame has been somewhat shortchanged. There are only 80 leaves! I guess VARIAN was a little short of working models at press time. Anybody wanna by some vaporware? Oh yeah, the leaves don't appear to be moving either. Rumor has it that there may be a secondary feedback pcb problem. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 120 mlc Message-ID: <3ab20e90.244c8869@aol.com> From: Accelinear@aol.com Reply-To: Accelinear@aol.com To: LINAC-ENG@plato1.aristotle.net Subject: 120 mlc Date: Mon, 19 Apr 1999 05:23:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On further, much closer examination of the promo shot for the 120 leaf mlc, there are indeed 80 -1/2cm leaves in the central region with 40-1cm leaves outside. They only appear to be 40 leaves in this photograph. Sorry for any confusion. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: used Radiotherapy treatment table needed. Message-ID: From: H van der Gugten To: list*RTFYS-L , list*MedPhys , list*Linac-Eng Cc: corine@jrc.nl Subject: used Radiotherapy treatment table needed. Date: Mon, 19 Apr 1999 04:53:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear colleagues, The following request is being posted in an attempt to assist the BNCT project group of the High Flux nuclear reactor in Petten, the Netherlands. The BNCT project is one of the European iniatives to develop Boron Neutron Capture Therapy for cancer patients. At present a draw back of the instrumentation in Petten is in the treatment table that is being used. However in this fase of the project it is unlikely that a completely new table can be developed. Instead it has been suggested that a used therapy table could be reconstructed into a suitable isocentric support for BNCT treatments. (European) institutes that are willing to donate or friendly sell their used treatment table are kindly requested to contact me. There are some preconditions to the sort of table that can be of use: The treatment facility is situated on the concrete basefloor of the reactor building. Digging pits is out of the question. We are looking for a used Hercules table or a table like the old Kermath or similar with very shallow anchoring of the isocentric bearing. Thank you for your attention, Regards, Henk ---------------------------------------------------------------------------- -- Henk W. van der Gugten voice : xx31.20.512.2116 Technical Specialist Radiotherapy fax : xx31.20.669.1101 The Netherlands Cancer Institute email : gugten@nki.nl Antoni van Leeuwenhoek huis Amsterdam The Netherlands ---------------------------------------------------------------------------- -- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 120 leaf mlc Message-ID: <3d082968.244bf363@aol.com> From: Accelinear@aol.com Reply-To: Accelinear@aol.com To: LINAC-ENG@plato1.aristotle.net Subject: 120 leaf mlc Date: Sun, 18 Apr 1999 18:48:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Anybody have a close look at the last informational promo by VARIAN for the 120 leaf mlc? (MEDICAL IMAGING - April 99). The announcement about this wonderful technological innovation has all the hallmarks of a CONSUMERS UNION "selling it" article. While the subtitle on the picture states "VARIAN'S new Millenium-120 collimator" it is clearly apparent that the cute technician also appearing in the frame has been somewhat shortchanged. There are only 80 leaves! I guess VARIAN was a little short of working models at press time. Anybody wanna by some vaporware? Oh yeah, the leaves don't appear to be moving either. Rumor has it that there may be a secondary feedback pcb problem. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 80 leaf mlc's, the saga continues Message-ID: <58fd73ca.244a5dd6@aol.com> From: SMcna39074@aol.com Reply-To: SMcna39074@aol.com To: linac-eng@plato1.aristotle.net Subject: 80 leaf mlc's, the saga continues Date: Sat, 17 Apr 1999 13:57:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" FYI we just finished replacing the second secondary feedback PCB on our 2100c/d s/n 1023 Thursday. Have had both sides fail now with hardware secondary feedback track failures. The FPGA is now a -03. Also, 80 leaf head transceivers are at rev -05, hope they last longer that the normal failure rate. I understand that the paper connecting cables are being changed--our normal lifespan is 6 months or less. Stan McNally, Cancer Foundation of Santa Barbara. 805-682-7300. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Hand Pendants? Message-ID: <37177D88.B808A3A8@cancerboard.ab.ca> From: Kurt Knibutat To: Linac Eng Listserver Subject: Re: Hand Pendants? Date: Fri, 16 Apr 1999 10:12:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Techs The new hand pendant documentation lists this as a feature. You will see the flashing LED's when a thumbwheel is selected without a MEB. You probably have an intermittent pendant cable or MEB switch, since this is happening with a motion in progress. Kurt Knibutat Tom Baker Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Hand Pendants? Message-ID: From: "Lapenna, Russ" To: 'Radiotherapy Technicians' , linac-eng@plato1.aristotle.net Subject: RE: Hand Pendants? Date: Fri, 16 Apr 1999 09:58:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =A0=A0=A0 That sounds like the error you are supposed to receive when = one of the motion enable bars is released while a motion is in progress. On the = older version pendants the motion enable bars weren't independant but the = newer ones are. =A0 Russ LaPenna Hamilton Regional Cancer Centre -----Original Message----- From: Radiotherapy Technicians [mailto:tex@dial.pipex.com] Sent: Friday, April 16, 1999 12:06 PM To: linac-eng@plato1.aristotle.net Subject: Hand Pendants? hello chaps =A0 Can anyone shed any light on the following problem. On our 2100c sn 687 version 5.2 we have a problem with the machine movements. When operating a thumbwheel on any motion occasionally the movement = stops and the leds go out on the thumbwheel leds except for the motion = selected which flash either side of the thumbwheel. To clear this we have to = release the motion enable bars. When this happens in auto set-up we have to = reselect auto to resume the movements. Sometimes the movement will stop just = short of the target and if this is within the tolerance it will allow you to = beam on.=A0 This seems to have happened since the pendants were upgraded with new software. =A0 =A0 The Techs North Staffs Oncology Centre=A0=20 England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Hand Pendants? Message-ID: <001b01be8823$780b6c40$174895c1@tech-office> From: Radiotherapy Technicians Reply-To: Radiotherapy Technicians To: linac-eng@plato1.aristotle.net Subject: Hand Pendants? Date: Fri, 16 Apr 1999 08:06:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" hello chaps Can anyone shed any light on the following problem. On our 2100c sn 687 version 5.2 we have a problem with the machine movements. When operating a thumbwheel on any motion occasionally the movement stops and the leds go out on the thumbwheel leds except for the motion selected which flash either side of the thumbwheel. To clear this we have to release the motion enable bars. When this happens in auto set-up we have to reselect auto to resume the movements. Sometimes the movement will stop just short of the target and if this is within the tolerance it will allow you to beam on. This seems to have happened since the pendants were upgraded with new software. The Techs North Staffs Oncology Centre England ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Victoreen survey meter Message-ID: <199904161347.OAA14538@mkoc.demon.co.uk> From: dfenn@mkoc.demon.co.uk To: linac-eng@plato1.aristotle.net Subject: Victoreen survey meter Date: Fri, 16 Apr 1999 05:47:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone have a copy of the manual and a circuit diagram for a Victoreen model 440 survey meter, that they would be willing to lend me or provide me with a photcopy? Many thanks in advance David Fenn Mid Kent Oncology Centre MAIDSTONE Kent ME16 9QQ UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: RF Rotary Joint Quad Seal Message-ID: <005201be87d5$85279460$eb03fea9@rwc2> From: Domenic Greco To: "Wilson, Jim" Subject: Re: RF Rotary Joint Quad Seal Date: Thu, 15 Apr 1999 22:50:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, I just completed replacing the seals on a new styele rotary joint (P/N 829708). If you haven't had one apart yet, realize that there are 2 seals. The inside of the donut ring uses the quad seal (the square shaped o-ring) P/N 27-459618, and the outside of the donut ring which uses the O-ring you speak of, 3/16" x 1/4", P/N 27-402823-00. The 'donut ring', as I call it, is the front plate right behind the circlip. Varian price for the quad ring: $33.00; for the o-ring: $8.19 Regards, Domenic Greco Radiation Electronics, Inc. 888-850-9729 -----Original Message----- From: Wilson, Jim To: 'Linac Bulletin Board Posting' Date: Wednesday, April 14, 1999 2:09 PM Subject: RF Rotary Joint Quad Seal >Thank you for all your excellent replies to my previous question about the >quad seal. I apparently have an oddball joint. Everyone gave me the same >part # 27-459618,( I ordered some just to make sure the one I had was not >just mismarked and they are not the correct size), which is for a 1/8" seal. >The one I need is about 3/16"-1/4". The joint is a Sage 323-5 Rev J, SN >225M, Varian PN# 829708-01. I will go back to the vendor one more time or >attempt to find this part locally if no one else has any other suggestions. >(Manufacturer info?) >Thanks >Jim Wilson >Providence Health Systems > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100 Printer Problem update Message-ID: <5f8d8b71.24468ad0@aol.com> From: RSAINC1@aol.com Reply-To: RSAINC1@aol.com To: linac-eng@plato1.aristotle.net Subject: 2100 Printer Problem update Date: Wed, 14 Apr 1999 16:20:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello again, Just wanted to revise my original message. We have a 2100 with version 5.2 software that is giving the printer problem every so often. (Not 5.4) Prints out weird stuff instead of what it's supposed too. (Morning checkout prints etc..) So far I've got one other response of another 5.2 c-series doing the same thing.....? I checked some stuff out today. It runs Dos version 6.22 (The only thing that has not been changed on this machine has been the Dos software) So I re-loaded Dos 6.22 from another set of disks and got printer function back..! Problem is, I don't trust this for very long. The symptom has come back before, after Clinac software upgrade, Printer change, printer cable change, and computer change. I also ran the Vi-spy anti virus software. No viruses were detected. (Don't know whether I trust that either) I will keep you all posted on how this turns out. Roger RS&A, Inc. RSAINC1@Aol.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2100 Printout problems Message-ID: <3715262A.D6D165B9@aristotle.net> From: Jim Beaty To: linac-eng@plato1.aristotle.net Subject: Re: 2100 Printout problems Date: Wed, 14 Apr 1999 15:35:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have the same problem on a 2100 with ver 5.2. Jim Beaty CARTI, Inc. RSAINC1@aol.com wrote: > Hello All, > Has anyone ever come across a problem where the printer spits out gibberish > (Ascii code I guess) every once in awhile? We have a Varian 2100 with ver > 5.4 doing this about every six months or so. It's a stumper, because the > printer, printer cable, and computer have been replaced in the recent > past.???? Anyone run into this before? > Roger > RSAINC1@Aol.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Position open Message-ID: From: "Hidalgo, Oscar" To: "'linac-eng@plato.aristotle.net'" Subject: Position open Date: Wed, 14 Apr 1999 08:22:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Fellow list members: We have a position open for an accelerator engineer, if you know someone who will be interested in moving South, please let him/her know about the position described below: Linear Accelerator Engineer Mary Bird Perkins Cancer Center, located in Baton Rouge, Louisiana, is seeking to hire a full-time Linear Accelerator Engineer. Candidate must have knowledge of test equipment, linear accelerator theory and experience in high energy electronics. Must be able to work flexible hours. Excellent pay and benefits package. Mary Bird Perkins Cancer Center , a community based ambulatory cancer treatment center has additional locations in Hammond, Louisiana and Covington, Louisiana. Mary Bird Perkins Cancer Center has provided outstanding services in the form of cancer treatment, research and community education to the surrounding areas and Baton Rouge community for over 27 years. The Accelerator Engineer will report to the Vice President, Physics and will be responsible for the repair and maintenance of electronic and electrical equipment at all three sites. Advanced or military training in electronics and/or training on Varian equipment with emphasis on linear accelerators are desirable. Interested applicants should contact via phone, mail, e-mail or fax Trisha Wright at: Human Resources Department Attention: Linear Accelerator 4950 Essen Lane Baton Rouge, Louisiana 70809 e-mail: trishaw@marybird.com Fax: (225) 767-4742 Phone: (225) 215-1170 EOE ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Force Sensitive Resistor - New Ximatron CX Message-ID: <37148D4A.57C4D105@wfubmc.edu> From: Tim Cullen To: GARRYANGEL@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Force Sensitive Resistor - New Ximatron CX Date: Wed, 14 Apr 1999 04:42:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Garry, look at schematic 56642000 FSR IF. It shows the FSR input going into a comparator which has a reference voltage set at 5.1Vdc by a zener and I don't see an adjustment there. I would check to see if the positive side of the comparator's input is dropping below this reference voltage first and also check the regulated 12Vdc supply on the pcb. _____ GARRYANGEL@aol.com wrote: Hi... Does anyone have info regarding the "Collision Pad" ,adjustment on the Ximitron I.I. pad.? We are getting intermittent "II" collision faults and am being told that this requires replacement of the assembly to the tune of approx $3000. Any info would be appreciated. Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Force Sensitive Resistor - New Ximatron CX Message-ID: From: "Lapenna, Russ" To: "'GARRYANGEL@aol.com'" , "'linac-eng@plato1.aristotle.net'" Subject: RE: Force Sensitive Resistor - New Ximatron CX Date: Wed, 14 Apr 1999 03:15:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have not worked on the II pad, but assuming it's the same as the electron cone pads which it appears to be, you should try removing the rubber padding and check the resistance of all the pressure tape strips. If they are correct, (which my guess is they will be since your problem is intermittent), you may find that reseating the rubber padding may fix your problem. Often a slight kink in the rubber or a slight imperfection in how it rests against the pressure strips, or even some trapped debris can put enough pressure on the strips to trigger a crash condition. Hope this helps. Russ LaPenna Hamilton Regional Cancer Centre > -----Original Message----- > From: GARRYANGEL@aol.com [mailto:GARRYANGEL@aol.com] > Sent: Tuesday, April 13, 1999 7:06 PM > To: linac-eng@plato1.aristotle.net > Subject: Re: Force Sensitive Resistor - New Ximatron CX > > > Hi... > > Does anyone have info regarding the "Collision Pad" > ,adjustment on the > Ximitron I.I. pad.? We are getting intermittent "II" > collision faults and am > being told that this requires replacement of the assembly to > the tune of > approx $3000. > > Any info would be appreciated. > > Garry > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DS12 solved ???? Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: DS12 solved ???? Date: Tue, 13 Apr 1999 15:43:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yeah G'day, Thanks for all who responded and sorry for being so silly. The integrator boards needed minor balancing. (MU2 was counting cMUs slowly). It looks like our DS12s have gone away. This does not explain how ((5% or 1MU) whichever is greater) can be true with MU1=MU2. But, I guess the bottom line is the interlock is staying off for complete treatments now. Thanks again, Dave ************************************************** There's only one sure thing in life, that's doubt.......I think. Good bye pork pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Force Sensitive Resistor - New Ximatron CX Message-ID: <6cc99fd2.244527dc@aol.com> From: GARRYANGEL@aol.com Reply-To: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Force Sensitive Resistor - New Ximatron CX Date: Tue, 13 Apr 1999 15:06:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi... Does anyone have info regarding the "Collision Pad" ,adjustment on the Ximitron I.I. pad.? We are getting intermittent "II" collision faults and am being told that this requires replacement of the assembly to the tune of approx $3000. Any info would be appreciated. Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100 Printout problems Message-ID: <354c4171.2444fa82@aol.com> From: RSAINC1@aol.com Reply-To: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: 2100 Printout problems Date: Tue, 13 Apr 1999 11:52:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All, Has anyone ever come across a problem where the printer spits out gibberish (Ascii code I guess) every once in awhile? We have a Varian 2100 with ver 5.4 doing this about every six months or so. It's a stumper, because the printer, printer cable, and computer have been replaced in the recent past.???? Anyone run into this before? Roger RSAINC1@Aol.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: RF Rotary Joint Quad Ring Seal Message-ID: <9800b8e3.2443e35e@aol.com> From: MLancaster@aol.com Reply-To: MLancaster@aol.com To: "Wilson, Jim" Subject: Re: RF Rotary Joint Quad Ring Seal Date: Mon, 12 Apr 1999 16:01:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I don't know the new number but if anyone will it is Richard Pecha at Technical Options of Georgia -- 800-755-9640. Mike Lancaster Oncology Maintenance Services ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Rotory Joints. Message-ID: <001e01be84f9$29c74180$f7f2c6d0@maine.ime.net> From: Howard and Sandy Freeman To: "Wilson, Jim" Subject: Rotory Joints. Date: Mon, 12 Apr 1999 07:28:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, I hope the information I sent you helped. I also want to make it very clear that my comment about superior service organizations was not intended to solicit business of any kind. Thanks, Howard Original message read: Best information I have for the number you want is: 27459617 old, 27402823 new (Sage Model# P5), o-rings are 27402821 old, 27459618 new. Model 323-3 or higher will have the new ring. This service has been provided by Accelinear Company and Technical Options. Clearly superior service organizations. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: RF Rotary Joint Quad Ring Seal Message-ID: <01BE84C8.42915920@user-38lcbda.dialup.mindspring.com> From: TECHNICAL OPTIONS To: "Wilson, Jim" Subject: RE: RF Rotary Joint Quad Ring Seal Date: Mon, 12 Apr 1999 05:38:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, Varian had an old style quad ring & o-ring, and a new style quad ring & o-ring for Sage rotary joints. Their numbers are as follows: Old style quad ring: 2745961700 Old style o-ring: 2740282100 New style quad ring: 2745961800 New style o-ring: 2740282700 Sorry, but we don't carry these (the manufacturer would only sell us 500 at a time.) Still, this info should help you with Varian. Remember, they have a $50.00 minimum, so find something else to order to make it worth your while. Lisa Technical Options ---------- From: Wilson, Jim Sent: Friday, April 09, 1999 11:06 AM To: 'Linac Bulletin Board Posting' Subject: RF Rotary Joint Quad Ring Seal Hello fellow linac slaves. Does anyone know the Varian part number for the newer style rotary joint quad ring? This squarish seal is about twice the width and height of the old style one. Our Varian rep has not been able to get me the correct number. Anybody out there know what it is? Jim Wilson Providence Health Systems Portland Or. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Quad Rings Message-ID: <000f01be82fb$1a591340$734bae98@oempreinstalled> From: Steve Schwarz To: "Wilson, Jim" Cc: ddileone@acceletronics.com Subject: Quad Rings Date: Fri, 9 Apr 1999 18:35:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, The Quad ring #'s are as follows: 27-459618 for the 4 1/2" X 1/8" and 27-459617 for the 5 1/4" X 1/8" Acceletronics has them in stock if you need them under part number 48 8066-00 and 48 8068-00. My Regards, Steve Schwarz, Acceletronics 800-626-8704 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian MLC 80 SFB Message-ID: <370E62F5.1FDE0EDE@wfubmc.edu> From: Tim Cullen To: linac-eng@plato1.aristotle.net Subject: Re: Varian MLC 80 SFB Date: Fri, 9 Apr 1999 12:28:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks for the replies. I considered the SFBK pcb's a low failure item also until the past week. One thing that both failures had in common is they happened after a dis-assembly/re-assembly for problems requiring the MLC removal. A Varian service rep did this one time when I was not here and I did this last week. I jinxed myself by mentioning the last time this MLC was removed there were problems afterwards. I took anti-static precautions and was extremely careful because this happened on the Thursday before Good Friday which I was supposed to have off....brings back memories of the post "when do machines fail." Well to make a long story short it worked fine the day I re-assembled the MLC and they were able to treat all their patients. But the next day it would not initialize properly. Replaced the SFBK with a spare I had, to get them up an running and everything was fine. I checked the used one out pretty close and the pads looked good. I have heard about the cables rubbing the backside of this pcb and also know about cleaning the pads but the last failure was the FPGA went thermal on me and I wound up replacing the pcb and the FPGA due to some revisions that Varian had made to the FPGA die. At some point I'll get time to TS this pcb some more and let you know what I find. thanks _____ Richard Kimball wrote: My experience is that these rarely fail, unless damaged by improper handling by static discharge or by excessive dirt accumulation from leaves, carriages etc. Most of the chips can be replaced fairly easy too! I try to keep the MLC hardware fairly clean and always wear a wrist strap when working around the MLC. When the board gets dirty, it can be cleaned with 99% or better alcohol and a chamois cloth. (don't use prep pads as it leaves little fibers which will mess up the response of the brushes) I have heard of the SFB boards being hard to come by but have not had the experience myself as I haven't needed one in about 2 years. Richard Kimball Senior Clinical Engineer Dept. of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Tim Cullen [ mailto:tcullen@wfubmc.edu ] Sent: Friday, April 09, 1999 10:36 AM To: linac-eng@plato1.aristotle.net Subject: SFBK PCBs I was wondering if the rest of you with Varian 80 leaf MLC units were having trouble with the failure of and the procurring of the Secondary Feedback PCB's for these units. I've had 2 failures in the past 4 months and both times I've had trouble getting them from Varian parts. thanks ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian MLC 80 SFB Message-ID: <370E6212.1332D5C6@wfubmc.edu> From: Tim Cullen To: linac-eng@plato1.aristotle.net Subject: Re: Varian MLC 80 SFB Date: Fri, 9 Apr 1999 12:24:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks for the replies. I considered the SFBK pcb's a low failure item also until the past week. One thing that both failures had in common is they happened after a dis-assembly/re-assembly for problems requiring the MLC removal. A Varian service rep did this one time when I was not here and I did this last week. I jinxed myself by mentioning the last time this MLC was removed there were problems afterwards. I took anti-static precautions and was extremely careful because this happened on the Thursday before Good Friday which I was supposed to have off....brings back memories of the post "when do machines fail." Well to make a long story short it worked fine the day I re-assembled the MLC and they were able to treat all their patients. But the next day it would not initialize properly. Replaced the SFBK with a spare I had, to get them up an running and everything was fine. I checked the used one out pretty close and the pads looked good. I have heard about the cables rubbing the backside of this pcb and also know about cleaning the pads but the last failure was the FPGA went thermal on me and I wound up replacing the pcb and the FPGA due to some revisions that Varian had made to the FPGA die. At some point I'll get time to TS this pcb some more and let you know what I find. thanks _____ Richard Kimball wrote: My experience is that these rarely fail, unless damaged by improper handling by static discharge or by excessive dirt accumulation from leaves, carriages etc. Most of the chips can be replaced fairly easy too! I try to keep the MLC hardware fairly clean and always wear a wrist strap when working around the MLC. When the board gets dirty, it can be cleaned with 99% or better alcohol and a chamois cloth. (don't use prep pads as it leaves little fibers which will mess up the response of the brushes) I have heard of the SFB boards being hard to come by but have not had the experience myself as I haven't needed one in about 2 years. Richard Kimball Senior Clinical Engineer Dept. of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Tim Cullen [ mailto:tcullen@wfubmc.edu ] Sent: Friday, April 09, 1999 10:36 AM To: linac-eng@plato1.aristotle.net Subject: SFBK PCBs I was wondering if the rest of you with Varian 80 leaf MLC units were having trouble with the failure of and the procurring of the Secondary Feedback PCB's for these units. I've had 2 failures in the past 4 months and both times I've had trouble getting them from Varian parts. thanks ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian MLC 80 SFB Message-ID: <457B79AC7AB2D211AAAC006097BDA6530623D3@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: linac-eng@plato1.aristotle.net Subject: Varian MLC 80 SFB Date: Fri, 9 Apr 1999 09:54:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My experience is that these rarely fail, unless damaged by improper handling by static discharge or by excessive dirt accumulation from leaves, carriages etc. Most of the chips can be replaced fairly easy too! I try to keep the MLC hardware fairly clean and always wear a wrist strap when working around the MLC. When the board gets dirty, it can be cleaned with 99% or better alcohol and a chamois cloth. (don't use prep pads as it leaves little fibers which will mess up the response of the brushes) I have heard of the SFB boards being hard to come by but have not had the experience myself as I haven't needed one in about 2 years. Richard Kimball Senior Clinical Engineer Dept. of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Tim Cullen [mailto:tcullen@wfubmc.edu] Sent: Friday, April 09, 1999 10:36 AM To: linac-eng@plato1.aristotle.net Subject: SFBK PCBs I was wondering if the rest of you with Varian 80 leaf MLC units were having trouble with the failure of and the procurring of the Secondary Feedback PCB's for these units. I've had 2 failures in the past 4 months and both times I've had trouble getting them from Varian parts. thanks ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: RF Rotary Joint Quad Ring Seal Message-ID: <001b01be82bd$046dff20$3cf2c6d0@maine.ime.net> From: Howard and Sandy Freeman To: "Wilson, Jim" Subject: Re: RF Rotary Joint Quad Ring Seal Date: Fri, 9 Apr 1999 11:12:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Best information I have for the number you want is: 27459617 old, 27402823 new (Sage Model# P5), o-rings are 27402821 old, 27459618 new. Model 323-3 or higher will have the new ring. This service has been provided by Accelinear Company and Technical Options. Clearly superior service organizations. -----Original Message----- From: Wilson, Jim To: 'Linac Bulletin Board Posting' Date: Friday, April 09, 1999 12:43 PM Subject: RF Rotary Joint Quad Ring Seal >Hello fellow linac slaves. Does anyone know the Varian part number for the >newer style rotary joint quad ring? This squarish seal is about twice the >width and height of the old style one. Our Varian rep has not been able to >get me the correct number. Anybody out there know what it is? > >Jim Wilson >Providence Health Systems >Portland Or. > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SFBK PCBs Message-ID: <370E1E4F.A4A7188A@wfubmc.edu> From: Tim Cullen To: linac-eng@plato1.aristotle.net Subject: SFBK PCBs Date: Fri, 9 Apr 1999 07:35:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I was wondering if the rest of you with Varian 80 leaf MLC units were having trouble with the failure of and the procurring of the Secondary Feedback PCB's for these units. I've had 2 failures in the past 4 months and both times I've had trouble getting them from Varian parts. thanks ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RF Rotary Joint Quad Ring Seal Message-ID: <0F5B9F57891AD211BF2100805FA7316C52F763@PHSORMSG03> From: "Wilson, Jim" To: 'Linac Bulletin Board Posting' Subject: RF Rotary Joint Quad Ring Seal Date: Fri, 9 Apr 1999 07:06:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello fellow linac slaves. Does anyone know the Varian part number for the newer style rotary joint quad ring? This squarish seal is about twice the width and height of the old style one. Our Varian rep has not been able to get me the correct number. Anybody out there know what it is? Jim Wilson Providence Health Systems Portland Or. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Weird fault Message-ID: <692b75df.243e772b@aol.com> From: Accelinear@aol.com Reply-To: Accelinear@aol.com To: DaveP@chhlth.govt.nz, linac-eng@plato1.aristotle.net Subject: Re: Weird fault Date: Thu, 8 Apr 1999 13:18:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In "communications" you can look up the DS12 code. This will tell if its a rate 1 vs rate2 problem or such. You need to know that the DS12 interlock is more complex in these later releases than in the earlier versions. Most likely though you just need to make sure that the integrators aren't counting during beam off. That means no centirad counts in at least 30 seconds from both integrators. (This problem was covered a few weeks ago). ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Weird fault Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Weird fault Date: Thu, 8 Apr 1999 12:19:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day all, I have a weird fault on a 2100 (#40) recently upgraded to ver 5.4 software. We get a DS12 error with MU1 and MU2 absolutely identical every time. The DS12 data in the dump file specifies a MU1 MU2 discrepancy rather than timer error. Does anyone have any ideas on this beaut. Thanks. Dave ************************************************** There's only one sure thing in life, that's doubt.......I think. Good bye pork pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Fixed-Service mode file process error Message-ID: From: Oktay Ureten To: linac-eng@plato1.aristotle.net Subject: Fixed-Service mode file process error Date: Thu, 8 Apr 1999 16:13:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The solution for this problem is to delete the index file (which is a zero byte file) under c:\varian\log directory. The only thing you have to do is to delete this file and restart the system. Nothing else. Thank you very much to everbody who has responded. Oktay Ureten ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Siemens Mag Fil P/S Message-ID: <199904080842060910.22A971FD@dfw.scf.sk.ca> From: Scot Thiesson To: dwatters@umcaz.edu, linac-eng@plato1.aristotle.net Subject: Re: Siemens Mag Fil P/S Date: Thu, 8 Apr 1999 06:42:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Dan, Because these power supplies regulate by controlling the input to the main power transformer with a Triac you will hear some humming. Typically on startup, with the lid of the supply sounding like your basic 1/4" metal speaker cone... :) This noise should go right away (and only happens for a second at most) as the output caps on the supply charge up. If you detect that the noise is coming from the inside of the supply then it's probably the main transformer. This can be easily verified with the old mechanics long screw driver trick, or a stethoscope. I have seen or heard rather, the larger solenoid power supplies on klystron based machines hum quite loudly...but not the supply for maggy based machines, they just don't suck enough power to 'audibly activate' things. Scot Thiesson Allan Blair Cancer Centre Regina Sask. Canada *********** REPLY PARTITION *********** On 4/7/99, at 10:40 PM, Watters, Dan wrote: >Hi All, > >I have 5 1/2 year old Siemens MD-2 that has a magnetron filament power >supply that hums louder than I think it should. Our 2 year old MD-2 is >silent in comparison. This may sound a little petty but this machine has >been doing this since before my arrival here, almost 4 years now. You can >hear this power supply even when you are outside the treatment room. The >power supply was changed by the Siemens service engineer about 3 1/2 years >ago because the previous one was humming very loudly. The new one did the >same thing. It does not seem to cause any problems, it is just annoying. I >swapped out the mag. fil. filter (M10) section tonight and that had no >effect. I also checked the wiring from the P/S to the M10. I suppose the >problem could be in the pulse tank or current control (S41) but I thought I >would utilize the wisdom of the list before going further. Siemens has told >me that some of their machines just do this and not to worry about it. It >isn't a big worry but I would like to know what is causing it. Anyone else >out there have this same type of problem on their MD-2's? > >Dan Watters >Radiology Engineering >University Medical Center >Tucson, Arizona ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Service Mode-File Processing Error Message-ID: <2d7a6138.243adaea@aol.com> From: Accelinear@aol.com Reply-To: Accelinear@aol.com To: Oktay.Ureten@science.ankara.edu.tr, linac-eng@plato1.aristotle.net Subject: Re: Service Mode-File Processing Error Date: Mon, 5 Apr 1999 19:35:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sounds like you may have a corrupt file. Possibly with the data in a pointer such as the pointer for the event files. I think the easiest solution is for you to backup your system configuration (in physics mode), format your hard drive and reload DOS and the Varian software. The machine configuration will automatically be restored if you back them up on the first linac software installation disk. Should solve your problem. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Service Mode-File Processing Error Message-ID: From: Oktay Ureten To: linac-eng@plato1.aristotle.net Subject: Service Mode-File Processing Error Date: Mon, 5 Apr 1999 11:04:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, When I go to service mode in our Clinac 2300C/D, I get the message 'File Processing Error. Cause Save Diagnostic File'. I have checked my hard disk for any possible damage, but there were no abnormal situation. This problem does not cause any malfunction except the error window that comes up to the screen all the time. Regards, Oktay Ureten ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: FW: NAME THE PROVIDENCE HEALTH SYSTEMS OREGON INTRANET Message-ID: <0F5B9F57891AD211BF2100805FA7316CBD0E47@PHSORMSG03> From: "Leeder, Mike" To: "Applebee, Emmett" , "Bushnell, Robert" , "Collins, Ken" , "Farnham, Don" , "Fein, David" , "Gordon, Michael" , "Greenlee, Mark" , "Griffith, Earl" , "Luckeroth, Joe" , "McIlroy, Donald" , "Pasion, Alden" , "Pearce, Ed" , "Ritchie, Brian" , "Scardigli, Wayne" , "Stober, Gary" , "Thompson, Steve" , "Wilson, Jim" , "Yoder, Curt" Cc: "Gilbert, Patricia" Subject: FW: NAME THE PROVIDENCE HEALTH SYSTEMS OREGON INTRANET Date: Thu, 1 Apr 1999 10:57:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" FYI > -----Original Message----- > From: Berry, Ben > Sent: Thursday, April 01, 1999 10:36 AM > To: OR PSA Managers > Cc: Massey, Sharon; OR PSA CTO Reports; Hartman, Al; Dahlen, Mike; > Tront, Denise; Baker, Cindy; Naboulsi, Shannon > Subject: FW: NAME THE PROVIDENCE HEALTH SYSTEMS OREGON INTRANET > > (Note. This message is not intended for PHP staff.) > > I want to thank each and every one of you who participated in renaming the > Oregon Intranet. The winner of the $35 gift certificate for the contest > to rename the Oregon Intranet site was Julie Minturn. Julie was the first > to submit the name "PHSNET", which won by a nearly 2:1 vote margin over > the nearest name competitor. This name was narrowed from the 15 finalist > names chosen by a management committee from over 320 names originally > submitted. The actual voting breakdown for the final 15 names is as > follows: > > Results of the Rename PHSWORLD in Oregon: > > Votes: > 13 connections > 31 inprov > 12 insidephs > 8 intraprov > 5 phscommunity > 6 phsinfolink > 4 phsinfonet > 55 phsnet > 7 phsnetworld > 23 phsoregon > 5 phsource > 2 phsresource > 11 phstoday > 5 phsworks > 19 provoregon > > > Of note in this electronic age is that Julie submitted the PHSNET only 26 > minutes ahead of the next nearest submission: Six Oregon employees > submitted PHSNET. > This name change from PHSWORLD coincides with our move to new Windows NT > servers to host our Intranet and releases the old name for use by the > entire Providence System. The new Intranet server with PHSNET will go > live on Monday, 5 Apr 99. All 85 of the Oregon Intranet publishers are > working hard to have their pages migrated and ready. Although the old > PHSWORLD name will be routed to PHSNET for some time to come, we will all > begin using the new name once it goes live! > > Again, thank you for your participation. > > Ben Berry > Chief Technology Officer, Oregon > Providence Health System > Tigard Business Center > IS-Administration > Providence Tigard Building > 11308 S.W. 68th Parkway > Tigard, Oregon 97223 > Phone: (503) 216-6114 > Fax: (503) 216-4599 > E-Mail: > Try our Intranet from inside the Providence Health > System Firewall: http://170.220.98.10/) > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 80 leaf version -03 head transceiver boards Message-ID: From: Kurt Knibutat Reply-To: kurtkn@CancerBoard.ab.ca To: GARRYANGEL@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: 80 leaf version -03 head transceiver boards Date: Thu, 1 Apr 1999 07:54:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Garry We have just accepted a 80 leaf MLC on a CL21EX S/N 1291. We had lots of erratic trouble. Apparently there are -04 boards in the system. The -03 boards are not great. The TAXI parts are too hot and the ASIC's have design problems. Try removing the aluminum shields on the TXCVR boards besides making sure the 5V supply is exactly 5.1V. If the supply is set any higher you will see more CRC errors again. Also check the input AC to the MLC supply. Ours was on the low side at 113VAC. We had our linac supply transformer adjusted from 204VAC to 210VAC which resulted in 118VAC at the supply. Finally we checked the grounding of our AC outlets at the console. The MLC workstation was properly tied to the linac but the MLC controller was not, as a result there was a ground loop between the two stations. ---------------------- Kurt Knibutat kurtkn@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 6e Electrons Message-ID: <199904010648.IAA04521@py.internet.sk> From: Jiri Bocanek To: linac-eng@plato1.aristotle.net Subject: Re: 6e Electrons Date: Thu, 1 Apr 1999 01:42:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Peter, this problem may cause few things, as far as I remember. I had similar symptoms on s.n.234, so machine with similar age a year ago. I recommend to check following: Open gun driver on cold deck side and pull out AFC preamplifier board. Clean whole cold deck from dust and brush contacts at the edge of this board. You mignt need to readjust setting of this preamplifier board ( gain ) because if the signal going to console form this board is "at the edge of AFC servo sensitivity" the servo behavies foolish. Finally check ALL connections at the AFC path from crystals up to preamplifier, this sometimes also gives problems. I could resolve such problem by doing described steps. Best regards from Jiri Bocanek AMEDIS Bratislava, Slovakia > Date: Wed, 31 Mar 1999 16:26:29 -0500 > From: "Peter E. Vitali" > Subject: 6e Electrons > To: "Linac-Engineers, Listserver" > Hi all: Recently I have started having problems with the electron > energy 6e, No Beam out. 2100C SN 228. This machine has 6X & > 10X. The electron energies are 4,6,9,12, and 15. > With in the last two months, intermittently I have had to adjust the > PFN, Gun and AFC on the energy program board. The problem centers > around 6e but is seen also on 9e. Surprisingly, 4e doesn't seem to be a > problem. One day I adjust the pots in one direction and the next time I > am turning them back to the original position. > > The first thing I suspected was that the AFC wasn't tracking since when > you look at the Analog Meter Screen the AFC difference was around 10 and > there was no beam out. Normally it is between -1.0 and +1.0, preferably > close to zero. If I manually adjusted the AFC I could get the beam. I > replaced the Relay on the energy Board that couples the AFC to the > mother board. At the same time I adjusted the R.F. Driver. That seem > to clear up the problem. > > A week later no beam. Checking the Analog Meter Screen the AFC > difference was around zero (0). So the AFC seemed to be working O.K. I > then adjusted the PFN and Gun. The PFN pot is changing by about 1 to 2 > turns. The Gun is adjusted slightly. A few days later I then adjust > the PFN back to around where it originally was. > > I forgot! I have Portal Vision on the Machine. But that is only > supposed to affect the output in Photon Modes. I replaced the Portal > Vision's version PFN Servo Board since the original Portal Vision PFN > Servo Board did not seem to operate correctly when you turned it off in > order to adjust the PFN level on the Energy Program board. It seemed to > work better when you turned it off but every now and then it doesn't > seem to work correctly. > > Anyone have any suggestions or has seen this problem before. > > > Thanks > > Peter E. Vitali > Therapeutic Radiological Engineer > Yale-New Haven Hospital > E-Mail: peter.vitali@yale.edu > Phone: (203) 688-2948 > > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 80 leaf version -03 head transceiver boards Message-ID: <199904010653.IAA04586@py.internet.sk> From: Jiri Bocanek To: linac-eng@plato1.aristotle.net Subject: Re: 80 leaf version -03 head transceiver boards Date: Thu, 1 Apr 1999 01:46:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Garry, simple solution: 03 head transceiver board are more sensitive for power supply failures ( even very short ones ). Check your 5 V supply and adjust for 5.1 V at the test points. If this does not help, replace whole PS assembly. The problem is probably NOT at the head transceiver itself. Regards Jiri Bocanek AMEDIS Bratislava Slovakia > From: GARRYANGEL@aol.com > Date: Wed, 31 Mar 1999 19:59:19 EST > To: linac-eng@plato1.aristotle.net > Subject: Re: 80 leaf version -03 head transceiver boards > Is anyone experiencing problems with the 80 leaf MLC ver 03 head xcvr boards? > > Seems like they only last for several weeks before they start "locking up". > Everything seems to be okay from 7 am until around noon. Then it needs to be > reinitialized often during the afternoon hours. CRC's, random leaf failures, > etc. BTW leafs are clean with motor currents 2.5 - 5.5 ma. > > I have heard that there are problems with the 03 boards but the OEM claims > that there are no 02 available. > > If anyone out there has the 02 boards I might be interested !!!! > > Thank you in advance for your assistance. > > Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Gun in never never land Message-ID: <1635AF330118480F@mailgw.swedish.org> From: Chris Coyle To: linac-eng@plato1.aristotle.net, sthiesson@scf.sk.ca Subject: Gun in never never land Date: Tue, 30 Mar 1999 12:48:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ======== Original Message ======== Just had a problem on our clinac 2100 s/n 1015 The gunI and GunV just went away for awhile. Started trouble shooting and by the time we had the panels aff the thing was back in the land of the living. I suspect a connection problem but can remember someone mentioning a thermistor problem on this list. Could it be related? Scot Thiesson Allan Blair Cancer Centre Regina Canada ======== Fwd by: Chris Coyle / ======== The thermistor problem only makes GFIL go away, its located under the GUN mother board and under the transformer. You can short this thermistor to test it out. I spaced the thermistor away from the PCB which cured my GFIL problem. Good luck Chris Coyle Swedish Tumor Inst. Seattle ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Gun in never never land Message-ID: <1EB2C38D998ED211B83400805F853AFE081DF5@europa.emh.org> From: "Denning, Mike" To: 'Scot Thiesson' , "Linac-eng (E-mail)" Subject: RE: Gun in never never land Date: Tue, 30 Mar 1999 14:16:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Look at RT1 on the Hot Deck Backplane. We had the same problem you had. Varian jumpered RT1 and the problem went away. On our hotdeck the thermistor was mounted on the bottom of the backplane right under T1, you could try remounting the thermistor on the top of the board and see if that helps. Let us know what you find. Mike Denning Cancer Care of Maine > -----Original Message----- > From: Scot Thiesson [SMTP:sthiesson@scf.sk.ca] > Sent: Tuesday, March 30, 1999 12:56 PM > To: linac-eng@plato1.aristotle.net > Subject: Gun in never never land > > Just had a problem on our clinac 2100 s/n 1015 > The gunI and GunV just went away for awhile. > Started trouble shooting and by the time we had the panels aff the thing > was back in the land of the living. > I suspect a connection problem but can remember someone mentioning a > thermistor problem on this list. Could it be related? > > Scot Thiesson > Allan Blair Cancer Centre > Regina > Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Gun in never never land Message-ID: <199903301156010230.043BF365@dfw.scf.sk.ca> From: Scot Thiesson To: linac-eng@plato1.aristotle.net Subject: Gun in never never land Date: Tue, 30 Mar 1999 09:56:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just had a problem on our clinac 2100 s/n 1015 The gunI and GunV just went away for awhile. Started trouble shooting and by the time we had the panels aff the thing was back in the land of the living. I suspect a connection problem but can remember someone mentioning a thermistor problem on this list. Could it be related? Scot Thiesson Allan Blair Cancer Centre Regina Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Gun in never never land Message-ID: <9c5bf763.37019ce8@aol.com> From: Accelinear@aol.com To: sthiesson@scf.sk.ca, linac-eng@plato1.aristotle.net Subject: Re: Gun in never never land Date: Tue, 30 Mar 1999 19:56:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" With the information you've given at best only a baseless guess can be made as to the actual cause of your problem but remember Ohms' law. If gunV is 0 gunI will certainly also be 0. I suggest you check all things Bertan (that is, anything related to the gun HV supply). ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 80 leaf version -03 head transceiver boards Message-ID: <461d8725.3702c4e7@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: 80 leaf version -03 head transceiver boards Date: Wed, 31 Mar 1999 16:59:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Is anyone experiencing problems with the 80 leaf MLC ver 03 head xcvr boards? Seems like they only last for several weeks before they start "locking up". Everything seems to be okay from 7 am until around noon. Then it needs to be reinitialized often during the afternoon hours. CRC's, random leaf failures, etc. BTW leafs are clean with motor currents 2.5 - 5.5 ma. I have heard that there are problems with the 03 boards but the OEM claims that there are no 02 available. If anyone out there has the 02 boards I might be interested !!!! Thank you in advance for your assistance. Garry ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 6e Electrons Message-ID: <3702929D.981C3982@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" Subject: 6e Electrons Date: Wed, 31 Mar 1999 13:26:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all: Recently I have started having problems with the electron energy 6e, No Beam out. 2100C SN 228. This machine has 6X & 10X. The electron energies are 4,6,9,12, and 15. With in the last two months, intermittently I have had to adjust the PFN, Gun and AFC on the energy program board. The problem centers around 6e but is seen also on 9e. Surprisingly, 4e doesn't seem to be a problem. One day I adjust the pots in one direction and the next time I am turning them back to the original position. The first thing I suspected was that the AFC wasn't tracking since when you look at the Analog Meter Screen the AFC difference was around 10 and there was no beam out. Normally it is between -1.0 and +1.0, preferably close to zero. If I manually adjusted the AFC I could get the beam. I replaced the Relay on the energy Board that couples the AFC to the mother board. At the same time I adjusted the R.F. Driver. That seem to clear up the problem. A week later no beam. Checking the Analog Meter Screen the AFC difference was around zero (0). So the AFC seemed to be working O.K. I then adjusted the PFN and Gun. The PFN pot is changing by about 1 to 2 turns. The Gun is adjusted slightly. A few days later I then adjust the PFN back to around where it originally was. I forgot! I have Portal Vision on the Machine. But that is only supposed to affect the output in Photon Modes. I replaced the Portal Vision's version PFN Servo Board since the original Portal Vision PFN Servo Board did not seem to operate correctly when you turned it off in order to adjust the PFN level on the Energy Program board. It seemed to work better when you turned it off but every now and then it doesn't seem to work correctly. Anyone have any suggestions or has seen this problem before. Thanks Peter E. Vitali Therapeutic Radiological Engineer Yale-New Haven Hospital E-Mail: peter.vitali@yale.edu Phone: (203) 688-2948 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1EB2C38D998ED211B83400805F853AFE081DEB@europa.emh.org> From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Date: Fri, 26 Mar 1999 09:34:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I get intermittent MLC interlocks on the workstation display that reads "Controller IL - WS COM timeout". It will beam off the machine with an MLC interlock. It happens randomly 3 or 4 times a day. We are running Varis. I've changed the Combo Comm board in the control computer with no improvement. I've also cleaned all of the boards and reseated them in the control computer. Any advice would be greatly appreciated. Mike Denning Cancer Care of Maine ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1EB2C38D998ED211B83400805F853AFE081DE8@europa.emh.org> From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Date: Fri, 26 Mar 1999 05:43:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm a hard time implementing Portalvision smoothly into our department. It isn't a smooth process for the docs to review their port images and it is a problem for the therapist to quickly review all of the previous days images to check for approved ports. We have Mk II PV with Ver 5 software. I'd appreciate talking to someone that is using PV now and seeing where I can smooth out some of the wrinkles in our process. Thanks Mike Denning Cancer Care of Maine ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian SSD Pointer Message-ID: <86256740.000016B0.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@notes.mdacc.tmc.edu To: linac-eng@plato1.aristotle.net Subject: Re: Varian SSD Pointer Date: Thu, 25 Mar 1999 16:04:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The "old style" pointer tips were tight-fitting and epoxied in. A little acetone soaking or heating sometimes helps with this. I suggest using nothing more powerful than a good heat gun. Use of a torch might overheat the thin aluminum walls of the tube. TimW ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian SSD Pointer Message-ID: From: RvrRtMark@aol.com To: mfraser@channel1.com, linac-eng@plato1.aristotle.net Subject: Re: Varian SSD Pointer Date: Thu, 25 Mar 1999 14:19:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Martin- There are two ways to get it out- one is to remove the opposite end of it ( plastic end cap) and use a long rod to drive it out. Place it in a vise with a towel around it with a moderate grip on it to do this. The other way is to again grip it with a vise and drill a hole through the tip big enough for a medium screwdriver and twist it back and forth until it dislodges. Hope this helps! Mark Brideson RAS Sacramento, Ca. USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Y2K Management Overrides Message-ID: <0F5B9F57891AD211BF2100805FA7316CBD0E06@PHSORMSG03> From: "Leeder, Mike" To: "Gordon, Michael" , "McIlroy, Donald" , "Wilson, Jim" Subject: Y2K Management Overrides Date: Thu, 25 Mar 1999 10:41:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19966.172FB140" ------_=_NextPart_002_01C19966.172FB140 Content-Type: text/plain; charset="iso-8859-1" Senior technicians do not have authorization to perform these overrides. Please refer these to a manager. ------_=_NextPart_002_01C19966.172FB140 Content-Type: image/gif; name="Tech.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="Tech.gif" Content-ID: <640523918@25031999-1081> R0lGODlhFAAUAPcAAP//////zP//mf//Zv//M///AP/M///MzP/Mmf/MZv/MM//MAP+Z//+ZzP+Z mf+ZZv+ZM/+ZAP9m//9mzP9mmf9mZv9mM/9mAP8z//8zzP8zmf8zZv8zM/8zAP8A//8AzP8Amf8A Zv8AM/8AAMz//8z/zMz/mcz/Zsz/M8z/AMzM/8zMzMzMmczMZszMM8zMAMyZ/8yZzMyZmcyZZsyZ M8yZAMxm/8xmzMxmmcxmZsxmM8xmAMwz/8wzzMwzmcwzZswzM8wzAMwA/8wAzMwAmcwAZswAM8wA AJn//5n/zJn/mZn/Zpn/M5n/AJnM/5nMzJnMmZnMZpnMM5nMAJmZ/5mZzJmZmZmZZpmZM5mZAJlm /5lmzJlmmZlmZplmM5lmAJkz/5kzzJkzmZkzZpkzM5kzAJkA/5kAzJkAmZkAZpkAM5kAAGb//2b/ zGb/mWb/Zmb/M2b/AGbM/2bMzGbMmWbMZmbMM2bMAGaZ/2aZzGaZmWaZZmaZM2aZAGZm/2ZmzGZm mWZmZmZmM2ZmAGYz/2YzzGYzmWYzZmYzM2YzAGYA/2YAzGYAmWYAZmYAM2YAADP//zP/zDP/mTP/ ZjP/MzP/ADPM/zPMzDPMmTPMZjPMMzPMADOZ/zOZzDOZmTOZZjOZMzOZADNm/zNmzDNmmTNmZjNm MzNmADMz/zMzzDMzmTMzZjMzMzMzADMA/zMAzDMAmTMAZjMAMzMAAAD//wD/zAD/mQD/ZgD/MwD/ AADM/wDMzADMmQDMZgDMMwDMAACZ/wCZzACZmQCZZgCZMwCZAABm/wBmzABmmQBmZgBmMwBmAAAz /wAzzAAzmQAzZgAzMwAzAAAA/wAAzAAAmQAAZgAAMwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACwAAAAAFAAUAEAIQwBJCBxI sKBBAAgTKlyYUCDDhwsdQpwoceLDihYjksh4cSNHjR9BhmzocSQAjCFRflTJkWVGlxZhUiw5UiZE gzhzBgQAOw== ------_=_NextPart_002_01C19966.172FB140-- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: VB: UNDRS 1 & 2 FAULTS Message-ID: <8F24D74ECF43D1118D4C006008559B2801EFB399@liosex1.lio.se> From: Viking Eilert To: "Linac-Eng (E-post)" Cc: Viking Eilert Subject: VB: UNDRS 1 & 2 FAULTS Date: Thu, 25 Mar 1999 02:06:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'm not sure this is the same problem, but it is simular. We have been told by Varian that there is a known problem with the comm = (and control?) processor PCB Vendor revision number 007, that could cause = UDRS intlk. They recommended us to replace it with a rev. number above 013. = (I have not been told that it has anything to do with the UDR1 and UDR2 = intlk). We replaced the comm proc PCB on two of our machines and the UDRS intlk = came not that often anymore (maybe a couple of times a month). The problem we have on our machines only appears in dynamic wedge mode = after cal check. Varian is telling us it is some kind of disturbence that = trips the intlk. The programmer didn't think of reseting the intlk in dynamic wedge mode, because it's not supposed to be there and it's not active = in dynamic wedge mode only in fixed mode. There's only two ways of reseting the intlk: One is to reset the = STD-bus (or the same thing turning off the machine or running the diagnostic test), = the other is to beam on in fixed mode at least 1 MU. Varian is telling us that the programmer have fixed the bug in version = 5,4. Eilert Viking Accelerator engineer University hospital in Link=F6ping Sweden > -----Ursprungligt meddelande----- > Fr=E5n: KENNETH R WRIGHT [SMTP:ACCELINEAR@prodigy.net] > Skickat: den 24 mars 1999 07:36 > Till: Accelinear@aol.com; GARRYANGEL@aol.com; > linac-eng@plato1.aristotle.net > =C4mne: Re: UNDRS 1 & 2 FAULTS >=20 > There was a problem with the Control and Comm Processors. (I don't > remember > what the main problem was.) They didn't know the cause but they knew = what > would fix it. The Mod called for checking the Vendor Rev number on = the > back > of both boards (not the Varian PN Rev). If the Rev Number was = 10,11, 12 > or > 13, the board was supposed to be replaced with the boards having a = Rev # > of > 14 or higher. The way it was explained to me when I was with Varian, = ANY > board before Rev 13 was to be replaced. Seems to me the Rev 07 - 09 > boards > were causing the UDR1 & 2 I/L's and they figured they would clean = this > problem out at the same time. >=20 > As mentioned, this was a "Mandatory - Reliability" mod on all "C" = series > machines above a certain S/N. For 2100C's and C/D's, I'm not sure = exactly > what the cut in was but It was somewhere in the late 400's. >=20 > The Rev 07 through 09 boards were (obviously) installed in S/N's = before > that. >=20 >=20 > -----Original Message----- > From: Accelinear@aol.com > To: GARRYANGEL@aol.com ; > linac-eng@plato1.aristotle.net > > Date: Monday, March 22, 1999 7:02 PM > Subject: Re: UNDRS 1 & 2 FAULTS >=20 >=20 > >If these udrs1,2 are happening without beam on then you need to have = the > >customer upgrade the machine to 5.4 (5.2 will fix it also). This was = a > common > >bug. This is a hardware/software fix and requires a Varian installed = mod. > >If the customer complains enough maybe they will get a break. This = was a > >mandatory mod. on all warrenty and contract customers sometime back. > > > > Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Disposal of 6/100 accelerator Message-ID: <84B807C5FAA4D211B91200A0C9DED0B813A82F@CAL007> From: Rosenberg Des To: "'linac-eng@plato.aristotle.net'" Subject: Disposal of 6/100 accelerator Date: Wed, 24 Mar 1999 19:58:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The Canberra Hospital (Canberra AUSTRALIA)will soon be disposing of a Varian Clinac 6/100 serial number #140 with a build date of June 1982. Installation was late 1982. The couch was replaced with an ETR couch and CCX Box in October 1992. Are there any expressions of interest out there for acquisition of all/sections/components of this installation?? Des Rosenberg Manager Electrosystems Biomedical Engineering The Camberra Hospital ACT AUSTRALIA E-mail: des.rosenberg@usa.net ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: re: third party service provision Message-ID: <000601be762e$40d18a40$660150c3@scm1> From: Sean Murphy Reply-To: Sean Murphy To: lin-acc digest Subject: re: third party service provision Date: Wed, 24 Mar 1999 11:39:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, I would like to offer thanks to everyone who responded to my request for information regarding third-party service provision agents. The information was very helpful and will hopefully be of use in further discussions. Thanks again to all concerned. Regards Sean Murphy Senior MTO RSH Hospital Southampton ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: UNDRS 1 & 2 FAULTS Message-ID: <01be75c0$94933ac0$c3d52581@oem773> From: KENNETH R WRIGHT To: Accelinear@aol.com, GARRYANGEL@aol.com, linac-eng@plato1.aristotle.net Subject: Re: UNDRS 1 & 2 FAULTS Date: Tue, 23 Mar 1999 22:35:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" There was a problem with the Control and Comm Processors. (I don't remember what the main problem was.) They didn't know the cause but they knew what would fix it. The Mod called for checking the Vendor Rev number on the back of both boards (not the Varian PN Rev). If the Rev Number was 10,11, 12 or 13, the board was supposed to be replaced with the boards having a Rev # of 14 or higher. The way it was explained to me when I was with Varian, ANY board before Rev 13 was to be replaced. Seems to me the Rev 07 - 09 boards were causing the UDR1 & 2 I/L's and they figured they would clean this problem out at the same time. As mentioned, this was a "Mandatory - Reliability" mod on all "C" series machines above a certain S/N. For 2100C's and C/D's, I'm not sure exactly what the cut in was but It was somewhere in the late 400's. The Rev 07 through 09 boards were (obviously) installed in S/N's before that. -----Original Message----- From: Accelinear@aol.com To: GARRYANGEL@aol.com ; linac-eng@plato1.aristotle.net Date: Monday, March 22, 1999 7:02 PM Subject: Re: UNDRS 1 & 2 FAULTS >If these udrs1,2 are happening without beam on then you need to have the >customer upgrade the machine to 5.4 (5.2 will fix it also). This was a common >bug. This is a hardware/software fix and requires a Varian installed mod. >If the customer complains enough maybe they will get a break. This was a >mandatory mod. on all warrenty and contract customers sometime back. > > Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Some Success. Message-ID: From: Ron Kimber To: linac-eng@plato1.aristotle.net Subject: Some Success. Date: Tue, 23 Mar 1999 23:14:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, just a little update on some previous issues I have raised on this list. Thanks to all who responded to my previous enquiries. Re-RF window on Elekta SL15. The window was sprayed with Vac seal and the vacuum has improved to like new. (Unit still has a gas leak though.) The window appeared very clean and I would go for a leak around the edge seal. No nasty arcing evident so quite happy about that. Re- Ion chamber with loose nuts. (Also on an SL15). The repaired chamber (nuts replaced and secured) was put back on a unit 4 weeks ago and has been performing very well. (Elekta are now aware of this potential problem and have taken measures to prevent it on new chambers). (have I thrown chambers due to this problem before????) (Has anyone else noticed the price of chambers has been creeping up?????) Bye for now. Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Mobile: 041 993 7776 Fax:61 (0) 8 93814364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Computer system administrator position Message-ID: <00ff01be7573$0e3fbea0$55c2a8cc@pipman> From: "Yakov Pipman, Phd" To: Varis users group , Medical Dosimetrists List , Linac Engineers Lists Subject: Computer system administrator position Date: Tue, 23 Mar 1999 13:20:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Please share the following with potential candidates. Computer systems Administrator A systems administrator position is available in the department of Radiation Oncology at Long Island Jewish Medical Center. Responsibility will be for management of a TCP/IP network of computers composed of Unix, VMS, Windows NT, Windows 3.1, and Mac OS workstations used for radiation treatment planning, delivery, and verification. The administrator will be required to maintain both system and application software on the network nodes, as well as maintain network efficiency in a diversified and steadily expanding environment. Interfacing with department staff at all levels is also necessary to trouble shoot problems, train system users, and develop new projects as needed. Successful candidate will have a bachelor's degree in Computer Science or related field, with two to three years of work experience in systems administration and project management. For additional information, contact Dr. Yakov Pipman, Department of Radiation Oncology, Long Island Jewish Medical Center, New Hyde Park NY 10042, 718-470-7199 (voice), 718-470-9756 (fax), pipman@lij.edu. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Third party Service cover Message-ID: <003001be755f$d602c040$6e0150c3@scm1> From: Sean Murphy Reply-To: Sean Murphy To: linac-eng@plato1.aristotle.net Subject: Third party Service cover Date: Tue, 23 Mar 1999 10:56:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, We are considering setting up a service contract for our three linear accelerators and simulators (all Philips) through a 'third party' insurance agent, namely Specialist Underwriters. We would welcome any opinions or suggestions on this company and method of service cover from centres that have either been down this route or are currently under such service provision. Particular points of interest are machine downtime figures before and after the contract, engineer and parts availability and cost savings. Thanks in advance for any information Sean Murphy Senior MTO RSH Hospital Southampton, UK ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Used Equipment Message-ID: <003b01be7551$7bb65420$82b3fbce@cathy> From: Jack Trochessett To: Medical Physicists Lists , Linac Engineers Lists Subject: Used Equipment Date: Tue, 23 Mar 1999 09:18:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Available now: 1985 Varian 1800 with 6 & 10 Photon beam, deinstalled. If interested please contact directly jacksrad@datasync.com Jack Trochessett ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: dysfunctional comm4 on Hostess board Message-ID: <199903230840590080.37C9CEA5@dfw.scf.sk.ca> From: Scot Thiesson To: linac-eng@plato1.aristotle.net Subject: dysfunctional comm4 on Hostess board Date: Tue, 23 Mar 1999 06:40:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi group, We have recently installed a C.T. option on our Varian ximatron simulator (s/n 705) and are now experiencing problems communicating on channel 4 of the Hostess comms link. I purchased a spare board and adapter box and installed and tested it. The symptoms were the same so I am convinced this is a software problem possibly related to the C.T. upgrade. The output of channel four is not dead. The link is sending a "[ ]" sequence continually. Further more pressing a "T" character on a terminal emulator should ask the interface for the ascii character set. The link suspends transmission of the "[ ]" sequence for a short while and then comes back with the "[ ]" prompts again. It is almost as if the transmission from the Varian end is going to the wrong port. I suspect this problem has never come up before because I suspect we are the only ones who have ever used all four ports on the Hostess link. Am I wrong? How many clinics out there have the C.T. option and use a contouring device requiring a serial data link? Regards, Scot Thiesson Senior physics tech Allan Blair Cancer Center Regina Sask. Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: DS12 errors Message-ID: From: terry.kearey@orebroll.se To: Accelinear@aol.com, DaveP@chhlth.govt.nz, linac-eng@plato1.aristotle.net Subject: SV: DS12 errors Date: Tue, 23 Mar 1999 00:50:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable > =C4mne: Re: DS12 errors >=20 > As this is happening with a count of Mu1=3DMu2=3D0, I suspect one of = your > integrator pcbs is counting slowly. Rezero both pcb boards and then = make > sure > there is no counting at the output of the pcbs (centimonitor units). = If so > adjust the linearity pot. to just stop the counting. There should be = no > counting for at least 30 secs. > This should have no effect on output but have a physicist check just = in > case. >=20 [Tel] Hi there, I didn't see the original posting (I'm new here). but it sounds like the problem we have also had. The assistants would set up for treatment = and then go in and set up the patient. The timer starts integrating and as = soon as MU1 or MU2 clocks a count you get a DS12 error. Varian have now = changed the proceedure for setting up the board which stops the problem. = Contact them for details. Regards Tel. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Answer to "gantry angle and missing radiation" Message-ID: <3.0.5.32.19990323101508.0098ec30@127.0.0.1> From: =?iso-8859-1?Q?Vesa-Pekka_Heikkil=E4?= To: Linac-Eng@plato1.aristotle.net Subject: Answer to "gantry angle and missing radiation" Date: Tue, 23 Mar 1999 00:15:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi there! First of all, thank you for the hints and suggestions where the problem might lie. Special thanks goes to Terry's poemetric instructions ;-) The problem appeared to be in AFC - it missed the B channel in certain angles because of the cable fault between the gantry patch panel and stand patch panel. The problem is now fixed. regards, V-P **************************************************************************** , , Vesa-Pekka Heikkila, Medical Physicist /( )\ Department of Oncology and Radiotherapy \ \___ / | Oulu University Hospital /- _ `-/ ' Kajaanintie 50 (/\/ \ \ /\ BOX 22 / / | ` \ 90220 OULU O O ) / | FINLAND `-^--'`< ' tel: +358 8 3153238 (_.) _ ) / fax: +358 8 3156449 `.___/` / E-mail: vph@cc.oulu.fi `-----' / <----, __ / __ \ <----|====O)))==) \) /==== <----' `--' `.__,' \ | | \ / ______( (_ / \______ ( ,-----' | \ `--{__________) \/ **************************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: UNDRS 1 & 2 FAULTS Message-ID: From: Accelinear@aol.com To: GARRYANGEL@aol.com, linac-eng@plato1.aristotle.net Subject: Re: UNDRS 1 & 2 FAULTS Date: Mon, 22 Mar 1999 15:25:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" If these udrs1,2 are happening without beam on then you need to have the customer upgrade the machine to 5.4 (5.2 will fix it also). This was a common bug. This is a hardware/software fix and requires a Varian installed mod. If the customer complains enough maybe they will get a break. This was a mandatory mod. on all warrenty and contract customers sometime back. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DS12 errors Message-ID: <9a8cde6d.36f6cf8a@aol.com> From: Accelinear@aol.com To: DaveP@chhlth.govt.nz, linac-eng@plato1.aristotle.net Subject: Re: DS12 errors Date: Mon, 22 Mar 1999 15:17:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" As this is happening with a count of Mu1=Mu2=0, I suspect one of your integrator pcbs is counting slowly. Rezero both pcb boards and then make sure there is no counting at the output of the pcbs (centimonitor units). If so adjust the linearity pot. to just stop the counting. There should be no counting for at least 30 secs. This should have no effect on output but have a physicist check just in case. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: UNDRS 1 & 2 FAULTS Message-ID: From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: UNDRS 1 & 2 FAULTS Date: Mon, 22 Mar 1999 12:26:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a cl-2100 c2 (ver 3.4) that intermittently exhibits undr1 & 2 faults that fail to clear upon mode selection. The last several times (approx. 2 times / week ) the problem has appeared in the 18x mode only. Whether this is coincidence or not is a goo question? I have talked to several around the country and have received comments regarding the software "causes" and possible problem with the Control Timer. Before I turn the system upside down I'd like to see if others have experienced this problem. Thank you in advance for your responses. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DS: DS12 errors Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: DS: DS12 errors Date: Sun, 21 Mar 1999 22:59:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ayai, and I thougt this was a V5.2 bug, witch could be solved by buying V.5.4. Keesjan. > ---------- > Van: Dave Pinchin[SMTP:DaveP@chhlth.govt.nz] > Verzonden: maandag 22 maart 1999 3:53 > Aan: linac-eng@plato1.aristotle.net > Onderwerp: DS12 errors > > G'day all, > > We have a V5.4 2100 produciing DS12 errors with data 01 (MU1 MU2 > discrepancy). > > The funny thing is that the MU1 and MU2 counts are exactly the same or > even 0. > > Any thoughts would be appreciated. > > Dave Pinchin.. > ************************************************** > There's only one sure thing in life, > that's doubt.......I think. > Good bye pork pie. > ************************************************** > > ********************************************************************** > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. If you have received this email in error please notify > the system manager. > > This footnote also confirms that this email message has been swept by > MIMEsweeper for the presence of computer viruses. > > www.mimesweeper.com > ********************************************************************** > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DS12 errors Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: DS12 errors Date: Sun, 21 Mar 1999 18:53:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day all, We have a V5.4 2100 produciing DS12 errors with data 01 (MU1 MU2 discrepancy). The funny thing is that the MU1 and MU2 counts are exactly the same or even 0. Any thoughts would be appreciated. Dave Pinchin.. ************************************************** There's only one sure thing in life, that's doubt.......I think. Good bye pork pie. ************************************************** ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel drive Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: Linac list server Subject: Re: Carrousel drive Date: Wed, 17 Mar 1999 08:02:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carrousel repair persons; Bob Tonks describes the problem and the solution well. Our experience was that the Greyhill SSR would conduct only half-wave when the relay got warm/hot...ie; when many re-selections of energies were being done...since the connected load on the SSR is a transformer primary winding the current drawn by the circuit was limited only by the D.C. resistance of the winding and the series resistor...the weak link is the resistor. A new SSR and some cooling air openings on the enclosure have 'cured' the problem for now. len.j. On Wed, 17 Mar 1999 09:57:00 -0500 btonks@lrcc.on.ca wrote: > > > Hi Jim, We had the same problem but the cause was the solid state relay that > provides power to the stepper motor. The relay was not turning on and off > cleanly and because of the inductive load caused hugh loads on the power > resistor. The relay was made by Grayhill. > > Bob Tonks > London Regional Cancer Centre > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Carrousel Drive Part 2 Message-ID: <921688175.17322.584@excite.com> From: aengstle@excite.com To: linac-eng@plato1.aristotle.net Subject: Carrousel Drive Part 2 Date: Wed, 17 Mar 1999 08:29:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello again and thanks to all for the suggestions. Last night I checked the current draw in series with the thermister and was getting very low current draw at first but after repeated energy selections got upwards of 9 amps on my meter. Looked at waveforms with a scope and adjusted per the directions on the schematics. The thermister starts at 50 ohms and goes down to 2 ohms when hot. Also noticed the current draw seemed to spike at times. After lubing everything I could think of and swapping the filter-target interlock board to eliminate the relay causing a problem I am going to order a new motor. It either has to be the motor or the OEM motor driver. Any more suggestions would be appreciated. Alan Engstler Gundersen Lutheran aengstle@mailexcite.com _______________________________________________________ Get your free, private email at http://mail.excite.com/ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel drive Message-ID: <85256737.0052CA54.00@mail.lrcc.on.ca> From: btonks@lrcc.on.ca To: "Jim Beaty \"Jim Beaty" , linac-eng@plato1.aristotle.net Subject: Re: Carrousel drive Date: Wed, 17 Mar 1999 07:04:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I double checked my schematics and the relay in question is K1 on the Filter and Target interlock board. It provides 120VAC to from pin 16 to T1 and through the NTC (7.5 ohm resistor). Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel drive Message-ID: <85256737.00521FC3.00@mail.lrcc.on.ca> From: btonks@lrcc.on.ca To: "Jim Beaty \"Jim Beaty" , linac-eng@plato1.aristotle.net Subject: Re: Carrousel drive Date: Wed, 17 Mar 1999 06:57:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Jim, We had the same problem but the cause was the solid state relay that provides power to the stepper motor. The relay was not turning on and off cleanly and because of the inductive load caused hugh loads on the power resistor. The relay was made by Grayhill. Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600C lower ind jaws Message-ID: <99Mar17.124544gmt.12018@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: Linac-Eng@plato1.aristotle.net Subject: 600C lower ind jaws Date: Wed, 17 Mar 1999 04:47:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For those of you that may be interested: As a follow up to the problem I posted a couple of weeks back regarding an intermittently ( 2-3 times per day ) sticking X jaw, the problem was probably caused by a sticking brake. The motor, gearbox and brake assembly was removed, stripped, cleaned and reassembled and there have been no further problems. Chris Forrest Cookridge Hospital Leeds U.K. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Gantry angle and missing radiation... Message-ID: <3.0.5.32.19990317132642.0094f990@127.0.0.1> From: =?iso-8859-1?Q?Vesa-Pekka_Heikkil=E4?= To: Linac-Eng@plato1.aristotle.net Subject: Gantry angle and missing radiation... Date: Wed, 17 Mar 1999 03:26:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi folks! We have a problem with our Clinac 2100 C/D; it doesn't give any radiation between the angles 180 <-> 270 (IEC) 6MV/18MV - nor does it give any errors. Any ideas what could cause this kind of X-files phenomenon? :-0 Best regards, Vesa-Pekka **************************************************************************** , , Vesa-Pekka Heikkila, Medical Physicist /( )\ Department of Oncology and Radiotherapy \ \___ / | Oulu University Hospital /- _ `-/ ' Kajaanintie 50 (/\/ \ \ /\ BOX 22 / / | ` \ 90220 OULU O O ) / | FINLAND `-^--'`< ' tel: +358 8 3153238 (_.) _ ) / fax: +358 8 3156449 `.___/` / E-mail: vph@cc.oulu.fi `-----' / <----, __ / __ \ <----|====O)))==) \) /==== <----' `--' `.__,' \ | | \ / ______( (_ / \______ ( ,-----' | \ `--{__________) \/ **************************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: SV: Elekta Field Lamp Message-ID: <01BE706E.E39F1640.goran.dahl@mse.dll.se> From: =?iso-8859-1?Q?G=F6ran_E_Dahl?= To: 'Chris FORREST' , Linac-Eng@plato1.aristotle.net Subject: SV: Elekta Field Lamp Date: Wed, 17 Mar 1999 03:08:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The special with the 13289 lamp is the lightintensity. The light is much more white in the 13289 than the 13189 lamp which seems to be yellow when compare the light. Goran E Dahl The Malarhospital Eskilstuna, Sweden ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Carrousel drive Message-ID: <36EF1C03.780EA78F@aristotle.net> From: Jim Beaty To: linac-eng@plato1.aristotle.net Subject: Re: Carrousel drive Date: Tue, 16 Mar 1999 19:05:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I've seen the same problem on two different 1800's. The schematic identifies the part as a thermistor, but on both of these machines it was actually a 7.5 ohm 25W resistor. Every 2 to 4 weeks this resistor would blow itself to pieces. I also tried lubricating the bearings, as well as replacing the motor, measuring motor current, and several other things. I finally replaced the resistor with a 10 ohm 50W, and haven't had a problem for three years. Hope this helps. Jim Beaty Chief Engineer CARTI, Inc. jimbeaty@aristotle.net aengstle@excite.com wrote: > Greetings: I have a 2100c sn 139. In the carrousel drive electronics there > is a thermister which seems to want to > self-destruct lately. I had replaced it about 5 years ago and also adjusted > the motor drive at that time. So far I have sprayed some tri-flow into the > carrousel bearings to be sure it spins freely and will get on the machine > later tonight. I was wondering if anyone has any quick ideas. In the past on > this list I seem to remember that someone had a fix for this and I can't > seem to find where the file is. Also, does anyone have an adjustment > procedure for the stepper motor drive? Back when it was adjusted I seem to > remember guessing as to where to set these and getting the motor to run at > the right speed and not drae too much current. > Thanks > Alan Engstler > Gundersen Lutheran > aengstle@mailexcite.com > > _______________________________________________________ > Get your free, private email at http://mail.excite.com/ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Carrousel drive Message-ID: From: "Lapenna, Russ" To: "'aengstle@excite.com'" , linac-eng@plato1.aristotle.net Subject: RE: Carrousel drive Date: Tue, 16 Mar 1999 07:46:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had to upgrade the carousel motor on our 2100's S/N's 330 and 331. Apparently the motor in the original design was not strong enough to handle the drag after extensive use. If you have not upgraded this motor yet, you may want to contact Varian for what is now a standard modification. Along with the mod. other components were upgraded including cct. boards. Russ LaPenna Hamilton Regional Cancer Centre -----Original Message----- From: aengstle@excite.com [mailto:aengstle@excite.com] Sent: Tuesday, March 16, 1999 9:30 AM To: linac-eng@plato1.aristotle.net Subject: Carrousel drive Greetings: I have a 2100c sn 139. In the carrousel drive electronics there is a thermister which seems to want to self-destruct lately. I had replaced it about 5 years ago and also adjusted the motor drive at that time. So far I have sprayed some tri-flow into the carrousel bearings to be sure it spins freely and will get on the machine later tonight. I was wondering if anyone has any quick ideas. In the past on this list I seem to remember that someone had a fix for this and I can't seem to find where the file is. Also, does anyone have an adjustment procedure for the stepper motor drive? Back when it was adjusted I seem to remember guessing as to where to set these and getting the motor to run at the right speed and not drae too much current. Thanks Alan Engstler Gundersen Lutheran aengstle@mailexcite.com _______________________________________________________ Get your free, private email at http://mail.excite.com/ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Carrousel drive Message-ID: <921594593.16811.582@excite.com> From: aengstle@excite.com To: linac-eng@plato1.aristotle.net Subject: Carrousel drive Date: Tue, 16 Mar 1999 06:29:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings: I have a 2100c sn 139. In the carrousel drive electronics there is a thermister which seems to want to self-destruct lately. I had replaced it about 5 years ago and also adjusted the motor drive at that time. So far I have sprayed some tri-flow into the carrousel bearings to be sure it spins freely and will get on the machine later tonight. I was wondering if anyone has any quick ideas. In the past on this list I seem to remember that someone had a fix for this and I can't seem to find where the file is. Also, does anyone have an adjustment procedure for the stepper motor drive? Back when it was adjusted I seem to remember guessing as to where to set these and getting the motor to run at the right speed and not drae too much current. Thanks Alan Engstler Gundersen Lutheran aengstle@mailexcite.com _______________________________________________________ Get your free, private email at http://mail.excite.com/ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Pulse Cables Message-ID: <99Mar16.152005gmt.14338@firewall1.ccotrust.co.uk> From: Richard Clements To: 'Linac-Eng' Subject: Pulse Cables Date: Mon, 15 Mar 1999 05:55:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone know of a UK supplier of triaxial HT pulse cable? Its for a Philips/Elekta SL75/14. Thanks Richard Clements Clatterbridge Centre for Oncology Bebington Wirral Merseyside. L63 4JY Tel: (+44) 151 334 1155 ext 4168 Fax: (+44) 151 604 7391 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Klystron replacement Message-ID: From: Craig Pearce To: 'linac eng' Subject: Klystron replacement Date: Tue, 9 Mar 1999 14:03:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello everyone We are considering replacing one of our Klystrons with a rebuild product from CTL (California Tube Laboratory) Has anyone had any experiences with this companies Klystron products. We have used their magnetron products in the past and have had no problems with them, however I am still curious as to other users views. Does anyone have any general procedures for fitting Klystrons? Hints and cautions would also be of interest. I look forward to our collective words of wisdom . Craig Pearce Technical Officer Medical Physics and Clinical Engineering Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: HWFA interlock Y Jaws Message-ID: <36E052B6.260169D@yale.edu> From: "Peter E. Vitali" To: Listserver Linac-Engineers Subject: HWFA interlock Y Jaws Date: Fri, 5 Mar 1999 13:57:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This may be the second time you get this message but when I reviewed the retruned message I sent out the linac-eng address was wrong. Sorry. Intermittent Y jaw HWFA interlocks. Our machine is 2100C S/N 228. The wiring to the pots: Is it single multistrand wire or is it ribbon wire? We had a problem with the Y2 Jaw and it turned out to be the multi strand wiring. The wire is 20 to 40 strand wire. When it starts breaking down the resistance can change and give you slight variations of the voltage in, or voltage out. We found it because the Y2 jaw started doing the Cha-Cha when it moved to a certain position. We were checking the cables to the motor for this problem (Which Causes A HWFA Interlock ) in the same harness when we found that two of the Primary Pot wires were defective. Originally we replaced the Primary and Secondary pots one at a time and did calibrations over a 2 months period. Problem would happen every 3 to 10 days after a calibration or pot change. We almost replaced the feed thru cable between the collimator and the gantry. You can either get a whole harness or separate wire from Varian. I have not been able to find the multistrand wire in the regular wire catalogs that I use. It is listed on the parts portion of the collimator Jaw schematics. The Harness is not the obvious listed harness but one in some later schematics. We have one machine with ribbon cable and I believe I had to replace the cable and little board on top of the motor a few years ago. The Harness for the older 2100Cs is 877365-01D. It comes with switches andterminals with a cost of around $800.00. The wire comes in various colors and you can get it by the foot (12 X 2.54cm). The Varian number is 81-140-XXX. XXX = 000 to 009. 000 to 009 is the color of the wire. Hope this Helps. Pete Vitali Therapeutic Radiological Engineer Yale-New Haven Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y1 Jaw Message-ID: <199903051229360830.0A8D3B55@dfw.scf.sk.ca> From: Scot Thiesson To: Jiri.Bocanek@py.internet.sk, linac-eng@plato1.aristotle.net Subject: Re: Y1 Jaw Date: Fri, 5 Mar 1999 10:29:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This does NOT appear to be a mechanical problem in my case. The clinac we have is serial number 1015 and was commissioned in June of '97. The problem has been around since the date of install. After inspection on the wiring and changing the pots I came to the conclusion that this must be some sort of design flaw, possibly with the way Varian routes the cables. It is not a big deal in our case as the problem only occurs about once every two months or so. It is a problem though and I would like to get more feedback on this issue. Scot Thiesson Allan Blair Cancer Centre Regina Sask. Canada *********** REPLY PARTITION *********** On 3/5/99, at 10:49 AM, Jiri wrote: >Hi to all, >SO, guys, if a change of the electronic components does not help, what is >it? MECHANICS! > >Simply wipe out old grease on the gears and aply new one. Be carefful what >to use, new grease must be radiation insensitive. Ask Varian rep. what to >use. I believe that correct grease is SHELL Calithia EP2 Moss. >This might not be a solution in all cases, but it works in the case, when >slave jaw has problems to track master, especially on low speed. > >Next thing to check is a trolley ( rod ) on which Y jaws travel. Clean it >and apply few drops of Molykote Omnigliss, or Triflow oil. Is this becomes >sticky, you get the same symptoms. > >Please notice, that almost all of you have machines older than 5 years, >that's the time to make some cleaning. > > >Best regards, Jiri Bocanek >Bratislava >Slovakia > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 2100 (Y1) jaw Message-ID: <199903051758.JAA16913@attos.bctel.net> From: Randy Wick To: Linac-eng list Subject: Re: 2100 (Y1) jaw Date: Fri, 5 Mar 1999 09:54:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We also have had problems on all of our Varian machines, except for a brand new 2100EX (4mo clinical). It seems to have been more of a problem on the older 2100's (sn 265, 266) but also 2100C3 (sn 609) and a 600C (sn 417). Sometimes it is the expected type of failure (bad pot, broken wires, RF noise etc.) but if the HWFA's seem to occur when the gantry is at either side and at a particular collimator angle it could be that the worm gear is a bit loose. You can see this happen if you set the coll so that the Y jaws will be pulled down by gravity, and look at the assym readouts while rotating the gantry. Normally the readout should not change at all. There is a set screw on the top that holds a retaining pin (it doesn't stick out much, is about 4mm diameter) at an angle into the gear box. If this is loosened, pressure can be applied onto the pin while you retighten the set screw. You won't feel any movement but the above test could show some results, if you're lucky. It doesn't always work, but we were able to eliminate nagging problems on the older 2100's where changing the pots just didn't help. Another thing to look for is to watch the readouts with beam on. Sometimes they flicker around, and a beam tune-up will fix the problem. Try adjusting the gun injection timing, too. Other people on the list in the past have suggested moving cables around (pulse?), as that can cause noise too. We have also had problems with the sample-and-hold's on the meter interface board. ---------------------------------------------------------------------------- --------------------- Randy Wick Radiotherapy Service Vancouver Clinic British Columbia Cancer Agency Vancouver BC Canada rwick@bccancer.bc.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: DS: Y1 Jaw Message-ID: <36E00D7E.8D3F22B7@yale.edu> From: "Peter E. Vitali" To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, Listserver Linac-Engineers Subject: Re: DS: Y1 Jaw Date: Fri, 5 Mar 1999 09:00:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The wiring to the pots: Is it single multistrand wire or is it ribbon wire? I had a problem with the Y2 Jaw and it turned out to be the multi strand wiring. The wire is 20 to 40 strand wire. When it starts breaking down the resistance can change and give you slight variations of the voltage in, or voltage out. I found it because the Y2 jaw started doing the Cha-Cha when it moved when it got to a certain position. I was checking the cables to the motor in the same harness when I found that three of the wires were defective. Originally we replaced the pots one at a time and did calibrations for about 2 months. Problem would happen every 3 to 10 days after a calibration or pot change. I almost replaced the feed thru cable between the collimator and the gantry. You can either get a whole harness or separate wire from Varian. I have not been able to find it in the regular wire catalogs that I use. It is listed on the parts portion of the collimator schematics. It is not the obvious listed harness. Also look at the ribbon cable. I have one machine with ribbon cable and I believe I had to replace the cable and little board on top of the motor a few years ago. The Harness for the older 2100Cs is 877365-01D. It comes with switches andterminals with a cost of around $800.00. The wire comes in various colors and you can get it by the foot (12 X 2.54cm). The Varian number is 81-140-XXX. XXX = 000 to 009. This is the color of the wire. Hope this Helps. Pete Vitali Therapeutic Radiological Engineer Yale-New Haven Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Y1 Jaw Message-ID: <004501be6727$6bc942d0$e30abe84@vvws4.oscs.varian.com> From: Jiri To: Scot Thiesson , linac-eng@plato1.aristotle.net Subject: Re: Y1 Jaw Date: Fri, 5 Mar 1999 08:43:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi to all, SO, guys, if a change of the electronic components does not help, what is it? MECHANICS! Simply wipe out old grease on the gears and aply new one. Be carefful what to use, new grease must be radiation insensitive. Ask Varian rep. what to use. I believe that correct grease is SHELL Calithia EP2 Moss. This might not be a solution in all cases, but it works in the case, when slave jaw has problems to track master, especially on low speed. Next thing to check is a trolley ( rod ) on which Y jaws travel. Clean it and apply few drops of Molykote Omnigliss, or Triflow oil. Is this becomes sticky, you get the same symptoms. Please notice, that almost all of you have machines older than 5 years, that's the time to make some cleaning. Best regards, Jiri Bocanek Bratislava Slovakia ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 2100 Y(1) jaw Message-ID: From: "Loeks, Michael" To: "'Linac-eng@plato.aristotle.net'" Subject: RE: 2100 Y(1) jaw Date: Fri, 5 Mar 1999 07:24:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, I had a problem with intermittent HWFA interlocks being caused by Y1 jaw PRO/SPRO mismatch. My predecessor fought it for a couple of years. I finally caught it one day while it was in a hard failure mode. I traced the problem to a broken wire in the harness that goes from the SPRO pot to the collimator wind-up cable. It used to cause a HWFA interlock several times a week. I haven't seen a HWFA interlock since the middle of November. Now that I've said this I'm sure the problem will come back. :-0 HTH, Mike Michael Loeks Biomedical Technician Providence Health Systems Portland, Oregon, USA -----Original Message----- From: Mlaa@aol.com [mailto:Mlaa@aol.com] Sent: Thursday, March 04, 1999 8:27 PM To: linac-eng@plato1.aristotle.net Subject: 2100 Y(1) jaw Hello linac eng., Thanks to all that responded to my problem I had earlier with replacing the fail safe brake and motor on the cl2500 we service. Now can someone help with another jaw problem on a 2100c(2)? The serial # is around 300. We have inherited this problem which has been on- going for a few years. The problem is that the independant jaw Y (1)does not track properly with the master jaw. We have changed the Y (1) primary and secondary PRO pots. We have heard form a reliable source that during this time period Varian used a different type of gearing then on the later editions. The fix was to change out the head. Has anyone had this problem and what did you do to fix it? Any help would be appreciated. When it rains jaw problems it pours jaw problems. Thanks in advance, Mike Liddicote Bob Dyer Accelerator Associates ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Y1 Jaw Message-ID: From: "Ukos, John" To: "Linac Engineers (E-mail)" Subject: RE: Y1 Jaw Date: Fri, 5 Mar 1999 06:24:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Add 2100c sn's 330 & 331. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Y1 Jaw Message-ID: <199903050812510170.09A22941@dfw.scf.sk.ca> From: Scot Thiesson To: linac-eng@plato1.aristotle.net Subject: Y1 Jaw Date: Fri, 5 Mar 1999 06:12:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Count me in the Y1 situation as well. I have believed for a long time that the problem is noise but have not been able to nail the thing down. Scot Thieeson Allan Blair Cancer Centre Regina Sask. Canada ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Y1 Jaw Message-ID: <01BE6758.88A43B40.cpearce@voyager.co.nz> From: cpearce Reply-To: cpearce@voyager.co.nz To: 'Keith Croft' Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: Y1 Jaw Date: Fri, 5 Mar 1999 01:24:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Keith Croft [SMTP:KeithC@midcentral.co.nz] Sent: Friday, 5 March 1999 19:30 To: 'LinacEng' Subject: Y1 Jaw Yes we too have had problems... on a 600C #174 We have replaced both the primary and secondary pots. But continue to see HWFA, from time to time with Y1. Things we have observed - which maybe a red hearing... Allowing the Wiper of the pots for the jaws to float, the raw reading for all tend to float to a negative value - except for Y1 primary which quickly jumps up to a positive value. Interestingly the Y1 primary is right next to the Coll+, the positive supply for the pots, on a number of cables feeding back through to the gantry patch panel for the collimator. Though this doesn't appear to be the cause of the problem. Have yet to swop the sample and hold board. Have tried different sample and hold IC's - same result. As to the cause of the fault - ? Keith Palmerston North New Zealand. (I also hear Wellington, the next center south from here, has the same or similar problem on a 2100C with the Y1 jaw generating HWFA, it too has had its pots replaced without the problem being solved.) PS 2 centers north in Auckland has the same problem and it does not matter what you change ,it always comes back. What a chance event, all the machines in a country having the same problem. Is this a problem that only this country has I do not think so. Sounds like a design problem. Keith give me a call on monday and we can dicuss this more fully Craig Pearce ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: DS: Y1 Jaw Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Cc: HA.de.Zeeuw@walcheren.ziekenhuis.nl Subject: DS: Y1 Jaw Date: Thu, 4 Mar 1999 23:22:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Here is another boy with the same problem. HWFA once in 10-14 days, some periods 3x a day. After recalibration less frequent. Hav'nt changed pots till now. Won't do that, now I read this news. But what is the solution? Keesjan de Bruijne Ziekenhuis Walcheren / ZRTI Vlissingen, THE NETHERLANDS CJ.de.Bruijne@walcheren.ziekenhuis.nl > ---------- > Van: Keith Croft[SMTP:KeithC@midcentral.co.nz] > Verzonden: vrijdag 5 maart 1999 7:30 > Aan: 'LinacEng' > Onderwerp: Y1 Jaw > > Yes we too have had problems... on a 600C #174 > > We have replaced both the primary and secondary pots. But continue to see > HWFA, from time to time with Y1. > > Things we have observed - which maybe a red hearing... Allowing the Wiper > of the pots for the jaws to float, the raw reading for all tend to float > to a negative value - except for Y1 primary which quickly jumps up to a > positive value. Interestingly the Y1 primary is right next to the Coll+, > the positive supply for the pots, on a number of cables feeding back > through to the gantry patch panel for the collimator. Though this doesn't > appear to be the cause of the problem. > > Have yet to swop the sample and hold board. Have tried different sample > and hold IC's - same result. > > As to the cause of the fault - ? > > > Keith > Palmerston North > New Zealand. > > (I also hear Wellington, the next center south from here, has the same or > similar problem on a 2100C with the Y1 jaw generating HWFA, it too has had > its pots replaced without the problem being solved.) > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Y1 Jaw Message-ID: <00BE56E17E26D11197CB00805FA6803A010CA838@210-55-172-67.ipnets.xtra.co.nz> From: Keith Croft To: 'LinacEng' Subject: Y1 Jaw Date: Thu, 4 Mar 1999 22:30:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes we too have had problems... on a 600C #174 We have replaced both the primary and secondary pots. But continue to see HWFA, from time to time with Y1. Things we have observed - which maybe a red hearing... Allowing the Wiper of the pots for the jaws to float, the raw reading for all tend to float to a negative value - except for Y1 primary which quickly jumps up to a positive value. Interestingly the Y1 primary is right next to the Coll+, the positive supply for the pots, on a number of cables feeding back through to the gantry patch panel for the collimator. Though this doesn't appear to be the cause of the problem. Have yet to swop the sample and hold board. Have tried different sample and hold IC's - same result. As to the cause of the fault - ? Keith Palmerston North New Zealand. (I also hear Wellington, the next center south from here, has the same or similar problem on a 2100C with the Y1 jaw generating HWFA, it too has had its pots replaced without the problem being solved.) ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 2100 Y(1) jaw Message-ID: <409282f.36df5d0b@aol.com> From: Mlaa@aol.com To: linac-eng@plato1.aristotle.net Subject: 2100 Y(1) jaw Date: Thu, 4 Mar 1999 20:26:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello linac eng., Thanks to all that responded to my problem I had earlier with replacing the fail safe brake and motor on the cl2500 we service. Now can someone help with another jaw problem on a 2100c(2)? The serial # is around 300. We have inherited this problem which has been on- going for a few years. The problem is that the independant jaw Y (1)does not track properly with the master jaw. We have changed the Y (1) primary and secondary PRO pots. We have heard form a reliable source that during this time period Varian used a different type of gearing then on the later editions. The fix was to change out the head. Has anyone had this problem and what did you do to fix it? Any help would be appreciated. When it rains jaw problems it pours jaw problems. Thanks in advance, Mike Liddicote Bob Dyer Accelerator Associates ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Clinac 4x/80 data Message-ID: <00d601be652a$dc38e2e0$9f0f0dd0@default> From: Michael Ohm To: linac-eng@plato1.aristotle.net Subject: Varian Clinac 4x/80 data Date: Tue, 2 Mar 1999 20:03:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" List members: I'm in need of some geometrical collimator data for this unit for treatment planning purposes (ADAC P3). The info required is: source-to-flattening filter distance source-to-bottom of upper jaws source-to-bottom of lower jaws upper jaw thickness lower jaw thickness If anyone has knowledge of these values, would you please pass them along. Varian has indicated difficulty in finding these numbers since the unit is so old ( ~ 25 yrs) and they apparently didn't keep a close eye on those kind of specs. Thanks, Michael Ohm Schneider & Wuest, Inc. Radiological Physics Consultants NW Ohio x-rays@dcache.net ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Portal Vision HV Power Supply Message-ID: <19990302152405.24707.qmail@hotmail.com> From: Oktay Ureten To: linac-eng@plato1.aristotle.net Subject: Portal Vision HV Power Supply Date: Tue, 2 Mar 1999 07:24:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a broken high voltage power supply (no 300V DC output) in our portal vision system. After some check, I realized that the TDE1747 IC at the output of the power supply is damaged. TDE 1747 is from SGS Thompson and it is an interface circuit-relay and lamp driver IC. But, unfortunately, it is no longer available from the manufacturer. Do you know any replacement for this part or any other solution about this problem. Oktay Ureten, ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Message-ID: <000a01be6462$78dbdcc0$96f2c6d0@maine.ime.net> From: Howard and Sandy Freeman To: "Denning, Mike" , "Linac Questions (E-mail)" Subject: Re: Date: Mon, 1 Mar 1999 20:09:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, I think your question will help us all get a grip with regard to our chosen field if we all give realistic and truthful answers. In an effort to "get the ball rolling" I offer this: $50,000 to $65,000. Please publish the results for us all. -----Original Message----- From: Denning, Mike To: Linac Questions (E-mail) Date: Monday, March 01, 1999 7:31 PM >You've all suffered through my whining about needing service days for my >department. Now I have another request....... > >I'm trying to pull my wages up to the appropriate level for the work I do. >We have 2 Varian 2100 C\D's with Portalvision, one of those also has MLC. >We also have a Picker AcQsim and a conventional Cascade simulator. We use >Varis 1.4 for R&V of which I am the administrator and Varis Vision. I do >physics projects (immobilization devices etc.). I am also the network and >PC answer-man for the oncology department (both medical and radiation). > >I'm looking for pay ranges of the U.S. linac engineers on the list. > >Thanks in advance for the help! > >Mike Denning >Cancer Care of Maine > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <1EB2C38D998ED211B83400805F853AFE081DB9@europa.emh.org> From: "Denning, Mike" To: "Linac Questions (E-mail)" Subject: Date: Mon, 1 Mar 1999 14:16:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" You've all suffered through my whining about needing service days for my department. Now I have another request....... I'm trying to pull my wages up to the appropriate level for the work I do. We have 2 Varian 2100 C\D's with Portalvision, one of those also has MLC. We also have a Picker AcQsim and a conventional Cascade simulator. We use Varis 1.4 for R&V of which I am the administrator and Varis Vision. I do physics projects (immobilization devices etc.). I am also the network and PC answer-man for the oncology department (both medical and radiation). I'm looking for pay ranges of the U.S. linac engineers on the list. Thanks in advance for the help! Mike Denning Cancer Care of Maine ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: CL 2500 upper jaw motors Message-ID: From: Craig Pearce To: "'Mlaa@aol.com'" Cc: 'linac eng' Subject: RE: CL 2500 upper jaw motors Date: Mon, 1 Mar 1999 11:03:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Mike We have had need to change a brake in the jaw of our CL2500 recently. It had become sticky/did not work. The new brake assembly supplied by Varian is a little different from the one removed. It is an updated model which is shorter in height. The unit as supplied to us did not fit. You will find that you will need to machine a corner off the mounting bracket ( quite a bit ) of the new one to make it fit. I recall we needed to make a packer up to move the brake further out for some reason, no doubt some clearance was required. It helps to make a breakout cable (2 required) so you can run the jaws once they have been removed from the collimator. The connectors are made by AMP but were supplied by Varian. It took forever to work out the part number as the connectors are not listed in any of the drawings. By chance I realised that the same connectors are used in the Gantry motor drive system and so that was the clue that allowed me to work out their part number. Other than the above getting the jaws out is not such a problem (Done it a few times now ) Remember that the windup cable in the collimator could be crushed or warn and you in fact have a broken wire. Good luck and hope you do not have to many surprises Craig Pearce Technical Officer Medical Physics and Clinical Engineering Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz > -----Original Message----- > From: Mlaa@aol.com [SMTP:Mlaa@aol.com] > Sent: Monday, 1 March 1999 13:14 > To: Linac-Eng@plato1.aristotle.net > Subject: CL 2500 upper jaw motors > > Hello eng, > > Does anyone out there have any experience changing the upper jaw motors > and > brakes on a CL 2500? I am fairly certain that one of the brakes is hanging > up > not allowing the slave side to track properly. I have the corners cut off > of > the new brakes , but need to know of any hints, tips , or tricks to make a > terrible job a little easier. Any information would be appreciated. > Thanks in > advance, > > Mike Liddicote > Accelerator Associates ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: CL 2500 upper jaw motors Message-ID: <57a0ae9e.36d9dbca@aol.com> From: Mlaa@aol.com To: Linac-Eng@plato1.aristotle.net Subject: CL 2500 upper jaw motors Date: Sun, 28 Feb 1999 16:14:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello eng, Does anyone out there have any experience changing the upper jaw motors and brakes on a CL 2500? I am fairly certain that one of the brakes is hanging up not allowing the slave side to track properly. I have the corners cut off of the new brakes , but need to know of any hints, tips , or tricks to make a terrible job a little easier. Any information would be appreciated. Thanks in advance, Mike Liddicote Accelerator Associates ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: 600C LEIJ Sticking Message-ID: From: "Kloster, Stephen" To: 'Chris FORREST' Cc: "'Linac-Eng@plato1.aristotle.net'" Subject: RE: 600C LEIJ Sticking Date: Fri, 26 Feb 1999 05:25:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Chris, We had a similar problem on a 2100C/D. The brake for the malfunctioning jaw was not releasing (broken wire). In auto set-up, the jaws move at full speed until they are near the target size, and then switch to slow speed, if necessary. Fast speed can overcome the resistance of the brake, but slow speed cannot. You can see this effect with manual control, but of course no one notices this, because the Techs only ever move the jaws at full tilt :-( -----Original Message----- From: Chris FORREST [mailto:chrisf@ulth.northy.nhs.uk] Sent: Thursday, February 25, 1999 4:15 AM To: Linac-Eng@plato1.aristotle.net Subject: 600C LEIJ Sticking Anybody seen this before: We have a 600C LEIJ machine with toothed belt drive to the X jaws. Every now and again, the X1 jaw appears to stop moving before the target destination has been reached. When the fault occurred last, I checked the motors display in Service mode and it read +10 (FSD) for X1. To get it to go, I drove it back in the opposite direction. After that it was OK. I can think of dozens of things it could be, so what I'm really after is info from somebody who has experienced a similar problem and what the fix turned out to be. Chris Forrest Cookridge Hospital Leeds U.K. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mylar Message-ID: <99Feb25.134149mst.14362@gw.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato.aristotle.net'" Subject: Mylar Date: Thu, 25 Feb 1999 12:40:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all who responded to my post about adhesive mylar I would like to say thank you very much. Ordered a pack from Technical Options Georgia this morning. This list a really good resource. Thanks Again, Dan Watters Rad. Eng. UMC Tucson, AZ ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: 600C LEIJ Sticking Message-ID: <5fce7c28.36d57606@aol.com> From: RvrRtMark@aol.com To: chrisf@ulth.northy.nhs.uk, linac-eng@plato1.aristotle.net Subject: Re: 600C LEIJ Sticking Date: Thu, 25 Feb 1999 08:10:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, I had a problem nearly identical to yours. If it is consistent to one area, it my be gummed up in that area mechanically. If it is an auto function, driving to a location using the "auto set up," one of the readout pots may be going bad (misreading referenced location). I'd make sure all appplicable mechanical areas are cleaned up first, which of course is easier. The gears were gummed up on one jaw on mine, which the problem didn't occur after I cleaned it up (more thoughly than on the PMI). That was 8 months ago and it hasn't happened since. Good luck! Mark Brideson RAS Sacramento, Ca. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Mylar Message-ID: <1999Feb25.095900.1795.259136@nt_mail1.ololrmc.com> From: WillH@MARYBIRD.COM To: linac-eng@plato1.aristotle.net Subject: RE: Mylar Date: Thu, 25 Feb 1999 08:03:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Varian makes a ready to stick mylar cover for the ETR tennis racket. It is Pt # 00-878007-05. They, for some reason, don't make this same product for all of their various types of tables; however, MedTec Inc. does. The contact person at MedTec for this kind of stuff is Vince Hursh at 1-800-842-8688. They carry most sizes of pre-cut ready-stick mylar, and they also can cut the mylar to any size you want for a fairly reasonable price. Will Hall MBPCC 1-225-215-1122 ---------- From: Watters, Dan To: 'linac-eng@plato.aristotle.net' Subject: Mylar Date: Wednesday, February 24, 1999 4:38PM Hi All, I understand there is a type of mylar for the Varian machines that sticks to the perimeter of the tennis raquette instead of covering the entire table with the rolls at each end. Anyone out there have a source and/or experience with this type of mylar? Thanks, Dan Watters UMC Tucson ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mylar Message-ID: <2dd7073.36d48fe7@aol.com> From: Radsrus@aol.com To: dwatters@umcaz.edu Cc: linac-eng@plato1.aristotle.net Subject: Re: Mylar Date: Wed, 24 Feb 1999 15:48:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dan, call Richard at Technical Options of Georgia 800-755-9640 - they have the adhesive backed mylar for the table panels. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Clinac - mylar film Message-ID: <9902259198.AA919899008@mh-saraton.dpa.act.gov.au> From: peter_caunt@dpa.act.gov.au To: linac-eng@plato1.aristotle.net Subject: Clinac - mylar film Date: Wed, 24 Feb 1999 16:28:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, I understand there is a type of mylar for the Varian machines that sticks to the perimeter of the tennis raquette instead of covering the entire table with the rolls at each end. Anyone out there have a source and/or experience with this type of mylar? Thanks, Dan Watters UMC Tucson ================================================================= Dan, I recently ordered a pack of mylar film for our centre from Varian. Part No: 00878007-05-B for 6 films. Mylar size is 680 * 540 cms. We obtain at least 6 months treatment usage from each film. Hope this helps, Regards, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mylar Message-ID: <99Feb24.154003mst.14347@gw.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato.aristotle.net'" Subject: Mylar Date: Wed, 24 Feb 1999 14:38:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, I understand there is a type of mylar for the Varian machines that sticks to the perimeter of the tennis raquette instead of covering the entire table with the rolls at each end. Anyone out there have a source and/or experience with this type of mylar? Thanks, Dan Watters UMC Tucson ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Portal Vision Mark II Message-ID: <85256722.0060DCB2.00@mail.lrcc.on.ca> From: rmcvittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Varian Portal Vision Mark II Date: Wed, 24 Feb 1999 09:37:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are installing Varian Portal Vision Mark II on a 2100CD (C/D sn 1158) . Does anyone else out there have one? If so what kind of experience have you had with it? We just installed it this past weekend, the arm systems seems pretty well designed except for the covers. For those that are contemplating a PV system here is my $0.02 worth I was impressed with how few changes were required to the Linac. I was expecting more interconnections but it is just one card, two cables and moving 2 or 3 jumpers. Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Theratronics T1000 Message-ID: <1999Feb22.131900.1795.258300@nt_mail1.ololrmc.com> From: WillH@MARYBIRD.COM To: linac-eng@plato1.aristotle.net Subject: RE: Theratronics T1000 Date: Mon, 22 Feb 1999 11:22:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ok, wait a minute. Now who's on first? ---------- From: Richard.Newby@gstt.sthames.nhs.uk To: linac-eng@plato1.aristotle.net Subject: Theratronics T1000 Date: Monday, February 22, 1999 11:23AM Hi Guys We have two of these beasts, one of which is playing up. The first symptom was that characters entered on the keyboard were not being actioned by the Falcon board and echoed back. We tested by then taking the terminal off our second unit and trying it on the first. Again there was no communication. We then put the first terminal on the second T1000 and it didn't work. We took the Falcon board out of the second machine and tried it in the first using a PC emulating a VT420. It worked but still wouldn't work with the VT420 connected. Back to back testing of the terminals against the PC showed that the first terminal was dead but the second worked ok. We obtained a reconditioned terminal and tried it on the first machine, again no communications, but the machine was treating quite happily using the PC for a couple of weeks, then the Falcon board failed! Incidently, on returning the Falcon board to machine 2 the board promptly failed (the replacement board worked perfectly on the second machine with the correct terminal). We got a replacement Falcon board, plugged in our new terminal and connected it to the first machine. It worked...well just long enough to do the terminal set-up, then no communications. PC ok still. Has anyone got any ideas????? Cheers Rick Newby ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: When do machines breakdown during the day? Message-ID: <99Feb22.135202est.115633@gateway.healthlink.on.ca> From: "Feuerstake, Tom" To: "Linac Engineers (E-mail)" Subject: RE: When do machines breakdown during the day? Date: Mon, 22 Feb 1999 10:47:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Here is the data from our database that shows when machines are most likely to breakdown during the day. The data shows a pretty good trend from morning till evening As you would expect, the breakdowns tend to be in the morning. Time #events 8am 305 9 577 10 431 11 362 12 297 13 200 14 299 15 216 16 196 17 225 18 72 19 25 20 13 21 6 22 6 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: intermittent T/D fault upon programm Message-ID: <1999Feb18.161200.1795.257927@nt_mail1.ololrmc.com> From: WillH@MARYBIRD.COM To: linac-eng@plato1.aristotle.net Subject: RE: intermittent T/D fault upon programm Date: Thu, 18 Feb 1999 14:14:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Varian had a batch of guns a while back where the gun leads, inside the potting material, had been crimped, but not soldered. This would cause occasional GFIL faults. Sometimes these faults would be so brief that they weren't noticed, but of course would cause a T/D. The hotter the gun got, the more frequent the faults. Varian has a mod. available to fix this. It consist of some potting material and instructions on how to cut open your gun and re-solder the gun leads. Of course, if your gun has not been changed in the last year or so, this is probably not your problem. Will Hall MBPCC 225-215-1122 ---------- From: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: intermittent T/D fault upon programming Date: Wednesday, February 17, 1999 4:32PM Hi Group, I have an old CL1800 (s/n 39) with an intermittent problem of a T/D fault coming up from what the therapists say is only upon programming. There seem to be no other faults that are abnormal at this time. Unfortunately I haven't seen it happen with my own eyes yet! It has only happened 2 times in the last week and a half. There doesn't seem to be an common gantry or head angle to use to duplicate it with. I plan to replace the T/D relay in the modulator, but I doubt that's the problem. Has anybody had or seen this problem before? Thanks in advance, Mark Brideson RAS Sacram ento, CA. USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: EMI radiation on linacs Message-ID: <457B79AC7AB2D211AAAC006097BDA653062379@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: EMI radiation on linacs Date: Thu, 18 Feb 1999 10:48:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Actually, I think that the OEM's are tuned to this as they have been making modifications to older linacs and when I saw new machines at Varian's factory, even the console computer cabinet was EMI shielded. Siemens put a new shielded modulator on our MXE-2 about a year ago. Varian is shielding everything these days too! I am dying to see a Primus unit and what they have come up with there! Richard Kimball Senior Clinical Engineer Dept. of Radiation & Cellular Oncology The University of Chicago Medical Center 773.702.6879 -----Original Message----- From: Thomas W. McCausland [mailto:acceltek@flash.net] Sent: Thursday, February 18, 1999 9:04 AM To: linac-eng@plato1.aristotle.net Subject: Re: Mag Gauss @ Isocenter Date sent: Thu, 18 Feb 1999 06:14:29 -0600 From: Richard Kimball Subject: Re: Mag Gauss @ Isocenter To: Linac Engineers Good point on the bend magnet Richard, and I would figure that the focus and steering coils might put out a little bit of stray field also. Another good point was made by another lister about testing the gauss at the highest energy. Another thought is EMI radiation. With all the hoo-hoo about Cell phones and all that, EMI might be another concern. These accelerators tend to me noisy in the electrical department. This is an interesting thread. I'ts strange to me that in the 20 years I've been around these beasts, this subject has never come up. I'd still doubt that that any stray field would be very strong, but it sounds like the only way to tell for sure is measure it. I saw a signiture quote the other day on one of my airplane mailing lists. It was credited to RADM Grace Hopper , and I might not have it exactly quoted ... " One good measurment is worth a thousand expert opinions" Cheers, Tom McCausland AccelTek Inc. 1-888-619-8811 ------------- Reply Seperator ----------- > Don't forget too Tom that the bend magnet will have some magnetic field > although shielded somewhat. I too suggest measuring using a gauss meter. > > Cheers, > Richard > > ----- Original Message ----- > From: Thomas W. McCausland > To: > Sent: Wednesday, February 17, 1999 5:34 PM > Subject: Re: Mag Gauss @ Isocenter > > > >From: "Liounis, Dave" > >To: linac-eng@plato1.aristotle.net > >Subject: Mag Gauss @ Isocenter > >Date sent: Wed, 17 Feb 1999 16:25:10 -0500 > > > >> I have a question pertaining to the Gauss Level @ Isocenter. We have a > >> patient that has a implanted defib unit, and the defib can only > >> withstand 10 gauss or less, to prevent accidental activation. > > -----------Snip ----------- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Test Message Message-ID: From: "Krzyszkowski, Mark" To: "'linac-eng@plato1.aristotle.net'" Subject: Test Message Date: Thu, 18 Feb 1999 07:50:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is a test message, sorry for the inconvenience, please ignore. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Gauss Measurement Message-ID: <36CBE97D.12B90B9@wfubmc.edu> From: Tim Cullen Reply-To: tcullen@wfubmc.edu To: Linac eng Subject: Re: Gauss Measurement Date: Thu, 18 Feb 1999 02:20:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Bill, I was able to get in one of the Hi energy rooms and a machine we have a MLC fitted to had around 1.0 gauss at isocenter moded up in 20e. I rotated to 270 and checked at the front of the gantry/bend magnet area with the covers on and had anywhere from 7 to 12+ gauss passing the meter from front to top of the bend magnet. There is also a reading where the vacion pump is located and it was around 2 to 3 gauss. Tell Dave congrats for all of us. ------------------------------------------------------------------------ Barnes, Bill E. wrote: > Hello Tim, > > Dave is out on Maternity Leave. It's a Girl!! > > Now for my extramarital relations with my linac... I try to hug the unit > daily if it is working well, she responds well to the positive > reinforcement!!! > > We were trying to measure the gauss created by the Bending Magnet, > rather than the Maggy magnet... > Thanks for your input. > > Bill Barnes > Linac Engineer > Fox Chase Cancer Center ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mag Gauss @ Isocenter Message-ID: <199902181505.JAA06686@crius.flash.net> From: "Thomas W. McCausland" To: linac-eng@plato1.aristotle.net Subject: Re: Mag Gauss @ Isocenter Date: Thu, 18 Feb 1999 07:03:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Date sent: Thu, 18 Feb 1999 06:14:29 -0600 From: Richard Kimball Subject: Re: Mag Gauss @ Isocenter To: Linac Engineers Good point on the bend magnet Richard, and I would figure that the focus and steering coils might put out a little bit of stray field also. Another good point was made by another lister about testing the gauss at the highest energy. Another thought is EMI radiation. With all the hoo-hoo about Cell phones and all that, EMI might be another concern. These accelerators tend to me noisy in the electrical department. This is an interesting thread. I'ts strange to me that in the 20 years I've been around these beasts, this subject has never come up. I'd still doubt that that any stray field would be very strong, but it sounds like the only way to tell for sure is measure it. I saw a signiture quote the other day on one of my airplane mailing lists. It was credited to RADM Grace Hopper , and I might not have it exactly quoted ... " One good measurment is worth a thousand expert opinions" Cheers, Tom McCausland AccelTek Inc. 1-888-619-8811 ------------- Reply Seperator ----------- > Don't forget too Tom that the bend magnet will have some magnetic field > although shielded somewhat. I too suggest measuring using a gauss meter. > > Cheers, > Richard > > ----- Original Message ----- > From: Thomas W. McCausland > To: > Sent: Wednesday, February 17, 1999 5:34 PM > Subject: Re: Mag Gauss @ Isocenter > > > >From: "Liounis, Dave" > >To: linac-eng@plato1.aristotle.net > >Subject: Mag Gauss @ Isocenter > >Date sent: Wed, 17 Feb 1999 16:25:10 -0500 > > > >> I have a question pertaining to the Gauss Level @ Isocenter. We have a > >> patient that has a implanted defib unit, and the defib can only > >> withstand 10 gauss or less, to prevent accidental activation. > > -----------Snip ----------- ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mag Gauss @ Isocenter Message-ID: <36CBD2FD.749DB6A0@wfubmc.edu> From: Tim Cullen Reply-To: tcullen@wfubmc.edu To: Linac eng Subject: Re: Mag Gauss @ Isocenter Date: Thu, 18 Feb 1999 00:44:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, good question. You didn't mention hi or lo energy machines. I made a quick check on a lo energy 600C and it's almost nil, around 0.4 gauss at isocenter. As a matter of fact you have to get within 2-3 feet to the magnetron to get anything near what you have questioned. With the covers on and rotated at 270 I measured around 188 gauss at a "sweet" spot right on top of the maggie using a transverse probe on my F.W.Bell 4048. So keep them away from hugging your linac and you'll be ok. We have a policy of monitoring patients with implanted devices such as these with a defib/pacer monitor. This so far has always proven to be a just-in-case maneuver. ------------------------------------------------------------------------ Liounis, Dave wrote: > I have a question pertaining to the Gauss Level @ Isocenter. We have a > patient that has a implanted defib unit, and the defib can only > withstand 10 gauss or less, to prevent accidental activation. > > I have spoke with Varian w/o success. Can anyone assist with this > measurement? > > Bill Barnes > Radiation Oncology Engineer > Fox Chase Cancer Center > Philadelphia Pa. > "b_barnes@fccc.edu" ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: MAGNETIC FIELD NEAR ISOCENTER OF CLINAC Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A0C6C8B@radoncnt1.fccc.edu> From: "Barnes, Bill E." To: linac-eng@plato1.aristotle.net Subject: MAGNETIC FIELD NEAR ISOCENTER OF CLINAC Date: Thu, 18 Feb 1999 05:08:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank you, to everyone that has responded to my question. I received a fax from Varian's RSO, it is as follows: "" TO: TONY SORENSEN FROM: STAN JOHNSEN DATE FEB 17,1999 SUBJ: MAGNETIC FIELD NEAR ISOCENTER OF CLINAC MEASUREMENTS HAVE BEEN MADE OF THE MAGNETIC FIELD NEAR THE ISOCENTER OF A CLINAC 2100C/D. MEASUREMENTS WERE MADE USING A BELL LABS MODEL 640 HALL-EFFECT GAUSSMETER. WHEN THE CLINAC WAS SET IN THE 18 MV PHOTON MODE THE MAGNETIC FIELD AT ISOCENTER WAS APPROXIMATELY ONE THIRD GAUSS. MEASUREMENTS AT OTHER POINTS IN THE PATIENT PLANE YIELDED VALUES UNDER 1 GAUSS. INDEED, THESE VALUES ARE COMPARABLE TO THE EARTH'S MAGNETIC FIELD."" Perhaps this will help anyone else who might have the same questions. Bill Barnes Linac Engineer Fox Chase Cancer Center 215-728-2997 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mag Gauss @ Isocenter Message-ID: <002701be5b38$3c498560$7caf51d1@richard> From: Richard Kimball To: Linac Engineers Subject: Re: Mag Gauss @ Isocenter Date: Thu, 18 Feb 1999 04:14:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Don't forget too Tom that the bend magnet will have some magnetic field although shielded somewhat. I too suggest measuring using a gauss meter. Cheers, Richard ----- Original Message ----- From: Thomas W. McCausland To: Sent: Wednesday, February 17, 1999 5:34 PM Subject: Re: Mag Gauss @ Isocenter >From: "Liounis, Dave" >To: linac-eng@plato1.aristotle.net >Subject: Mag Gauss @ Isocenter >Date sent: Wed, 17 Feb 1999 16:25:10 -0500 > >> I have a question pertaining to the Gauss Level @ Isocenter. We have a >> patient that has a implanted defib unit, and the defib can only >> withstand 10 gauss or less, to prevent accidental activation. >> >> I have spoke with Varian w/o success. Can anyone assist with this >> measurement? >> >> >> Bill Barnes >> Radiation Oncology Engineer >> Fox Chase Cancer Center >> Philadelphia Pa. >> "b_barnes@fccc.edu" >> >> > >I would find it very suprising if the gauss level reached 10 gauss at >the patient treatment plane from a magnetron magnet. Of course >to be sure, you could get a gauss meter and measure the level in >that area. If you don't have one, your local >vendor..ie..Siemens/Varian should have one availible in the area, or >your MRI department might have one availible (although the levels >they measure are much higher and can ruin a meter made to >measure magnetron fields). The scientific supply houses sell them >also. Davis Instruments 1-800-368-2516 Part number WS94201 >$772, and probe number WS HP145R $290. Other places sell >them also, I just happened to have the Davis catalog handy. > >Good luck, I'd be interested to find out what you discover. > >Tom McCausland >AccelTek Inc. >1-888-619-8811 > > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: intermittent T/D fault upon programming Message-ID: <002101be5b37$e69361e0$7caf51d1@richard> From: Richard Kimball To: Linac Engineers Subject: Re: intermittent T/D fault upon programming Date: Thu, 18 Feb 1999 04:12:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" All the suggestions so far have been good ones. I have also seen this problem occur as a result of the gun programming pot in the HOT Deck having a bad spot. R. Kimball Univ. of Chicago Hospitals ----- Original Message ----- From: To: Sent: Wednesday, February 17, 1999 4:32 PM Subject: intermittent T/D fault upon programming >Hi Group, > I have an old CL1800 (s/n 39) with an intermittent problem of a T/D fault >coming up from what the therapists say is only upon programming. There seem >to be no other faults that are abnormal at this time. Unfortunately I haven't >seen it happen with my own eyes yet! It has only happened 2 times in the >last week and a half. There doesn't seem to be an common gantry or head angle >to use to duplicate it with. I plan to replace the T/D relay in the modulator, >but I doubt that's the problem. Has anybody had or seen this problem before? > Thanks in advance, > Mark Brideson > RAS > Sacramento, CA. > USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: intermittent T/D fault upon programming Message-ID: <19990218093234.3729.rocketmail@send102.yahoomail.com> From: michael porat To: linac-eng@plato1.aristotle.net Subject: intermittent T/D fault upon programming Date: Thu, 18 Feb 1999 01:32:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, I have an old CL1800 (s/n 39) with an intermittent problem of a T/D fault coming up from what the therapists say is only upon programming. There seem to be no other faults that are abnormal at this time. Unfortunately I haven't seen it happen with my own eyes yet! It has only happened 2 times in the last week and a half. There doesn't seem to be an common gantry or head angle to use to duplicate it with. I plan to replace the T/D relay in the modulator, but I doubt that's the problem. Has anybody had or seen this problem before? Thanks in advance, Mark Brideson RAS Sacramento, CA. USA Hi Mark, Have had a similar problem on our 1800 machine. The problem was with a 4.7K resistor, on an Intlk circuit in the fault matrix, degrading to 3K, minimizing the threshold for that circuit. During programming the load of the 24V P.S. increases, its voltage decreases and one of the filaments Intlks ( Klystron or Gun) came on momently activating the T.D. relay immediately. Hope this helps. == Michael Porat Head Radiotherapy Equipment Clalit- Biomedical Engineering Ltd _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Magnetic Gauss @ isocentre Message-ID: <9902189193.AA919311490@mh-saraton.dpa.act.gov.au> From: peter_caunt@dpa.act.gov.au To: linac-eng@plato1.aristotle.net Subject: Magnetic Gauss @ isocentre Date: Wed, 17 Feb 1999 21:15:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Re : I have a question pertaining to the Gauss Level @ Isocenter. We have a patient that has a implanted defib unit, and the defib can only withstand 10 gauss or less, to prevent accidental activation. I have spoke with Varian w/o success. Can anyone assist with this measurement? ========================================== Bill, Just a few thoughts on the subject. Though not greatly familiar with the actual implantable defibrillator which you are talking about, I have had experience with other implantable devices whose input and detect circuitry may be similar. Implantable pacemakers for example are also susceptible to external magnetic fields and in the presence of sufficient magnetic field revert to asynchronous operation. For example, one manufacturer designs their unit to operate in such a manner when a vertical magnetic field of 90 Gauss is applied at 1.25 inches from the actual detecting surface of the pacemaker. The operation in this manner doesn't adversely effect the unit and when the magnetic field is removed it operates as per normal. So, from here my personal technical opinion would be to ; * review the implant data as to the type of unit fitted * consider the manufacturers specifications for magnetic sensitivities at a particular distance * Hire, buy or borrow a calibrated gauss meter and measure (especially when moding at high energies) the magnetic field proximal to the proposed defibrillator position. * and if your still in that grey area, and your department wants to proceed, place the responsibility squarely upon the physicians and have one of them monitor the NIBP waveform (plethysmograph) during treatment. Hope this helps, Peter Caunt The Canberra Hospital Australia. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: intermittent T/D fault upon programming Message-ID: From: Accelinear@aol.com To: RvrRtMark@aol.com, linac-eng@plato1.aristotle.net Subject: Re: intermittent T/D fault upon programming Date: Wed, 17 Feb 1999 17:38:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mark, Try lifting the diode in the fault matrix that ties the GFIL to the kly fil fault line. If the problem goes away you've probably got an intermittent gun grid short. These used to be very common a few years ago. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Mag Gauss @ Isocenter Message-ID: <199902172336.RAA05548@crius.flash.net> From: "Thomas W. McCausland" To: linac-eng@plato1.aristotle.net Subject: Re: Mag Gauss @ Isocenter Date: Wed, 17 Feb 1999 15:34:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" From: "Liounis, Dave" To: linac-eng@plato1.aristotle.net Subject: Mag Gauss @ Isocenter Date sent: Wed, 17 Feb 1999 16:25:10 -0500 > I have a question pertaining to the Gauss Level @ Isocenter. We have a > patient that has a implanted defib unit, and the defib can only > withstand 10 gauss or less, to prevent accidental activation. > > I have spoke with Varian w/o success. Can anyone assist with this > measurement? > > > Bill Barnes > Radiation Oncology Engineer > Fox Chase Cancer Center > Philadelphia Pa. > "b_barnes@fccc.edu" > > I would find it very suprising if the gauss level reached 10 gauss at the patient treatment plane from a magnetron magnet. Of course to be sure, you could get a gauss meter and measure the level in that area. If you don't have one, your local vendor..ie..Siemens/Varian should have one availible in the area, or your MRI department might have one availible (although the levels they measure are much higher and can ruin a meter made to measure magnetron fields). The scientific supply houses sell them also. Davis Instruments 1-800-368-2516 Part number WS94201 $772, and probe number WS HP145R $290. Other places sell them also, I just happened to have the Davis catalog handy. Good luck, I'd be interested to find out what you discover. Tom McCausland AccelTek Inc. 1-888-619-8811 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Dose Rate Servo Message-ID: <36CB4386.D618BFAE@scf.sk.ca> From: Massimo Giovannetti Reply-To: mgiovannetti@scf.sk.ca To: "linac-eng@plato.aristotle.net" Subject: Dose Rate Servo Date: Wed, 17 Feb 1999 14:32:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I am having some trouble figuring out a problem with the dose rate servo on our 2100C3. Every once in a long while the dose rate servo tends to slow right down and then quickly speed up past 400 to as high as 475 and then back down to 400 during treatment in clinical mode. If I go into service mode it servos alot faster but still a little higher than I would like and then comes back down to 400. When I recycle the power on the machine I would see that the dose rate servo has returned to normal operation. Now, does anyone know why this happens? Is there something that service mode bypasses that causes the dose rate to servo faster? Is there a better remedy to this problem other than recycling power and wasting 12 minutes or more of treatment time? Thanks in advance. Massimo Giovannetti Physics Tech ABCC Regina, Sk. mgiovannetti@scf.sk.ca (306)766-2286 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: intermittent T/D fault upon programming Message-ID: <46920b8f.36cb4389@aol.com> From: RvrRtMark@aol.com To: linac-eng@plato1.aristotle.net Subject: intermittent T/D fault upon programming Date: Wed, 17 Feb 1999 14:32:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, I have an old CL1800 (s/n 39) with an intermittent problem of a T/D fault coming up from what the therapists say is only upon programming. There seem to be no other faults that are abnormal at this time. Unfortunately I haven't seen it happen with my own eyes yet! It has only happened 2 times in the last week and a half. There doesn't seem to be an common gantry or head angle to use to duplicate it with. I plan to replace the T/D relay in the modulator, but I doubt that's the problem. Has anybody had or seen this problem before? Thanks in advance, Mark Brideson RAS Sacramento, CA. USA ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Mag Gauss @ Isocenter Message-ID: <71E7B2BF1F32D211A8EF00104BD3345A078EF9@radoncnt1.fccc.edu> From: "Liounis, Dave" To: linac-eng@plato1.aristotle.net Subject: Mag Gauss @ Isocenter Date: Wed, 17 Feb 1999 13:25:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a question pertaining to the Gauss Level @ Isocenter. We have a patient that has a implanted defib unit, and the defib can only withstand 10 gauss or less, to prevent accidental activation. I have spoke with Varian w/o success. Can anyone assist with this measurement? Bill Barnes Radiation Oncology Engineer Fox Chase Cancer Center Philadelphia Pa. "b_barnes@fccc.edu" ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR Couch, Turntable Drive Assy Message-ID: <8525671B.0049F480.00@mail.lrcc.on.ca> From: btonks@lrcc.on.ca To: Accelinear%aol.com_AT_Internet%ccMail@lrcc.on.ca, linac-eng@plato1.aristotle.net Subject: Re: ETR Couch, Turntable Drive Assy Date: Wed, 17 Feb 1999 05:27:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We used to have this problem and took a while to figure how this could happen so often. I happened to be in the room when the techs where setting up and watched one rotate the couch and as it approached 0 degrees she stepped on the locking peg to stop the couch. There was quite a thud but I realized how it was being broken and was able to remedy it. We have been having alot less problems. But I realize that your techs wouldn't do anything like this so it must be some other cause. Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: ETR Couch, Turntable Drive Assy Message-ID: <6b761b7d.36ca2e38@aol.com> From: Accelinear@aol.com To: CCWDB@qe2-hsc.ns.ca, linac-eng@plato1.aristotle.net Subject: Re: ETR Couch, Turntable Drive Assy Date: Tue, 16 Feb 1999 18:49:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Having the roll pin break in the right angle drive is as common as the Varian trademark. In fact maybe it is its trademark. It has been a constant annoyance since the earliest Clinacs. The right angle drive is so cheap it is hardly worth fixing but if you want a good fix just replace the roll pins with solid dowel pins. They don't never break. Roll pins just wear out due to the back and forth motion and the fairly high torque involved. You just found out why service techs love the VEO baseframe which has been available for about 8 years now. Good luck ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: ETR Couch, Turntable Drive Assy Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net Subject: ETR Couch, Turntable Drive Assy Date: Tue, 16 Feb 1999 10:42:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Everyone, We have recently had 2 Turntable Drive Assy's fail on ETR Couch S/N 1735 and also on S/N 2218. A small gearbox in the assembly fails. In both cases a pin sheared internally - an input shaft to gear pin. Our first thought was that perhaps the Torque Limiter ( similiar to a slip clutch ) might be too tight. We checked these and they do appear to allow slippage when full power is applied from the pendant thumbwheel. I also thought perhaps the rotational brake may be dragging but when checked, it was OK. I do know that frequently the Tech's and others apply full thumbwheel and as the couch starts to move , realize they have the wrong direction and flip the thumbwheel rapidly for full power in the reverse direction. This causes stress on the mechanical system. Our machinist inspected the gearboxes ( their brand name is Mitrpak # R08 ) and found the bore for the pin in the shaft was 2/1000 greater than the bore in the gear, allowing some working to take place as the drive torque changes direction. He has now made a new shaft with slightly greater diameter. This allows the gear to be pressed on the shaft.He then drilled the pin hole in the shaft after the gear was pressed on and making an precision fit of gear/shaft & pin. The idea here was to get rid of any freeplay gear to shaft which might stress the pin. This is a lot of work and I'm wondering if anyone of you may have found a better replacement gearbox, or found some other solution. Any suggestions are appreciated. Regards Dave Burgess Electronics Technologist Nova Scotia Cancer Centre Halifax, Canada ccwdb@qe2-hsc.ns.ca ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian Ximatron Fluro video Message-ID: <199902160233.KAA23130@grunge.iinet.net.au> From: Ron Kimber To: Richard Kimball Cc: Linac Engineers Subject: Re: Varian Ximatron Fluro video Date: Mon, 15 Feb 1999 18:35:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard try talking to your diagnostic x-ray guys. They record cine runs in cardiac cath and neuro labs all the time. I know Philips cath labs can be recorded on a super VHS VCR which accept both NTSC and PAL signals. Hope this helps Regards At 07:27 1999-02-12 -0600, you wrote: >Interested in acquiring video from fluoroscopy to standard VCR on a Ximatron >CX. Attempted but unable to view. Is this digital or analog signal at >higher sync rate? Anyone? >Thanks. > >R. Kimball >Senior Engineer >Univ. of Chicago Hospitals > Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Mobile: 041 993 7776 Fax:61 (0) 8 93814364 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: New Machines Message-ID: <1999Feb15.144200.1795.257428@nt_mail1.ololrmc.com> From: WillH@MARYBIRD.COM To: linac-eng@plato1.aristotle.net Subject: New Machines Date: Mon, 15 Feb 1999 12:45:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The Group, We are in the process of negotiating with Varian for a multi-machine purchase of possibly two CL-2100EX 's, and a Ximitron CDX. My CFO has asked me to see if anyone among my peers, that's you guys, would be willing to share with us the specifics of any recent purchases of these kinds of machines. Mainly we want to know what price, and with what options, these things have been going for lately. I understand that this forum wasn't exactly intended for these kinds of questions; however, since I have no other form of peer input other than this list I am forced to ask this question here. Any help anyone can give me is greatly appreciated. Will Hall Accelerator Engineer Mary Bird Perkins Cancer Center Baton Rouge La. 225-215-1122 ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian Ximatron Fluro video Message-ID: <000501be58dc$037c9be0$e8af51d1@richard> From: Richard Kimball To: Linac Engineers Subject: Re: Varian Ximatron Fluro video Date: Mon, 15 Feb 1999 04:09:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks for the response I realize the HR of the camera, but thought it could be captured somehow, possibly with some kind of adapter. Regards, R. Kimball Univ. of Chicago Hospitals ----- Original Message ----- From: To: Sent: Sunday, February 14, 1999 6:48 PM Subject: Re: Varian Ximatron Fluro video >Most II cameras are high resolution, ie not NTSC. More lines per screen than >American television. Refer to the docs with the camera and or monitor, if you >have them. You may be able to buy a foreign VCR capable of recording and >playing back the signal but you'll probably also need a foreign TV to view it >with. >Good luck. >RT ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: kfil Message-ID: <4056a7d5.36c592a2@aol.com> From: Accelinear@aol.com To: edwardry@CancerBoard.ab.ca, CraigP@ahsl.co.nz Cc: linac-eng@plato1.aristotle.net Subject: Re: kfil Date: Sat, 13 Feb 1999 06:56:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Craig, The problem you experienced with the breaking of the standoffs for the klystron filament transformer is very common. Indeed most newer Varian high energy machines will experience it. Its due to the weak nylon standoffs/nuts now used as compared to the polycarbonate/steel studs/nuts used years ago. Linacs have been shipped with the klystrons installed for the past few years. The extra stress, small as it may be, may account for small cracks in the standoffs which expand to failure over a few years. Don't forget the limited cooling in the klystron side of the tank. That side goes from about room in the AM to "pretty hot" after a hard days use. Still its an easy repair, should only take an hour or so, and I've never had it reoccur. Marty ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian Ximatron Fluro video Message-ID: <003701be568b$62c25b60$80e551d1@richard> From: Richard Kimball To: Linac Engineers Subject: Varian Ximatron Fluro video Date: Fri, 12 Feb 1999 05:27:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Interested in acquiring video from fluoroscopy to standard VCR on a Ximatron CX. Attempted but unable to view. Is this digital or analog signal at higher sync rate? Anyone? Thanks. R. Kimball Senior Engineer Univ. of Chicago Hospitals ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Pendant Error Codes Message-ID: From: Steve Nelson To: "'tcullen@wfubmc.edu'" , Chris Coyle Cc: Linac Engineer Subject: RE: Pendant Error Codes Date: Thu, 11 Feb 1999 11:05:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Isn't that the one that you get when you plug in the cord while holding the pendant and squeezing the motion enable bars while doing so? Stephen > -----Original Message----- > From: Tim Cullen [SMTP:tcullen@wfubmc.edu] > Sent: Thursday, February 11, 1999 8:34 AM > To: Chris Coyle > Cc: Linac Engineer > Subject: Re: Pendant Error Codes > > Chris, an ERROR E is a motion enable bar test failure. > > ------------------------------------------------------------------------ > > Chris Coyle wrote: > > > Howdy all Linac Mechanics and may the Y2K bug not bite you. > > > > I'm looking for a Varian Pendant error code list. > > > > What is Error "E". > > > > Chris Coyle > > Swedish Tumor Inst > > Seattle ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Pendant Error Codes Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: Chris Coyle Cc: Linac Engineer Subject: Re: Pendant Error Codes Date: Thu, 11 Feb 1999 10:40:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris; Error "E" indicates that one of the pendant Motion Enable bars was depressed while the pendant was powered up...or alternatively if power was lost and then restored while the Motin Enable bar was depressed (such as occurs if you have an intermittant cable or connection). Happy hunting. len.j. On Thu, 11 Feb 99 08:32:00 -0800 Chris Coyle wrote: > Howdy all Linac Mechanics and may the Y2K bug not bite you. > > I'm looking for a Varian Pendant error code list. > > What is Error "E". > > Chris Coyle > Swedish Tumor Inst > Seattle ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Pendant Error Codes Message-ID: <36C2DC57.791F9866@wfubmc.edu> From: Tim Cullen Reply-To: tcullen@wfubmc.edu To: Chris Coyle Cc: Linac Engineer Subject: Re: Pendant Error Codes Date: Thu, 11 Feb 1999 05:34:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, an ERROR E is a motion enable bar test failure. ------------------------------------------------------------------------ Chris Coyle wrote: > Howdy all Linac Mechanics and may the Y2K bug not bite you. > > I'm looking for a Varian Pendant error code list. > > What is Error "E". > > Chris Coyle > Swedish Tumor Inst > Seattle ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Pendant Error Codes Message-ID: <79EAAD330118480F@mailgw.swedish.org> From: Chris Coyle To: linac-eng@plato1.aristotle.net Subject: Pendant Error Codes Date: Thu, 11 Feb 1999 08:32:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Howdy all Linac Mechanics and may the Y2K bug not bite you. I'm looking for a Varian Pendant error code list. What is Error "E". Chris Coyle Swedish Tumor Inst Seattle ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: HVOC and MOD Ilock update Message-ID: From: Steve Nelson To: 'Linac Engineers' Subject: HVOC and MOD Ilock update Date: Tue, 9 Feb 1999 07:33:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Group, I don't know about you folks, but it's been a very busy year for me and I don't see it letting up any time soon. Frank's thread reminded me that I owed you a followup. A while back I reported a problem with the crowbar circuit being related to the beam enable keyswitch and the doors. (8 yr old 2100C2) Well, as I suspected, the problem was resolved by replacing the Aux Elect. Relay Backplane assembly which was back feeding 120Vac to the crowbar from the AC door ckt. At that time I was hoping that this was somehow going to be tied to my false HVOC and MOD faults at beam on. No such luck. They have diminished in frequency from 10-15 events per day to 2-4 since I made the changeout. Within the next few days I will be changing K2 and the mode relays in the modulator because of ohmic contact problems. I'll let you know if this helps. regards, Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 803-792-3271 nelson@radonc.musc.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Update on Beam Off Problem Message-ID: <9902090957549D.09254@www4.iname.net> From: fmertes@email.com To: linac-eng Cc: feuerstake@clinphys.pmh.to Subject: Update on Beam Off Problem Date: Tue, 9 Feb 1999 06:57:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Back in December I had the problem with a CL2100C beaming off as soon as it beamed on. I wrote back and said that I had Varian in and we replaced the Aux Power Backplane and it fixed the problem. Well, two weeks later the problem came back. I recalled Varian in, since they helped before, and we troubleshoot the machine. To make it short, we found it was caused by the Ksol interlock. We found this by bypassing all the interlocks, except for the major ones. While they were bypassed, the clinac would beam on and stay on. This proved it was a real interlock beaming off the machine, but was not reporting on the operators monitor. So we turned them back on one row at a time, and watched the intput interface pcb's in the signal conditioning cardcage. I observed a faint flicker on an LED on input interface #2. After a few tries, I was able to narrow it to the Ksol interlock. So we activated all the interlocks to prove this. Beamed on and had the problem, bypassed the Ksol and it beamed on and it worked. Conclusion: Adjusted the Ksol pwr supply and the interlock circuits. The ksol interlock is a self clearing interlock, the trip level of the interlock circuit drifted and the dip in the line at "beam on" caused the interlock to trip, therefore terminating the beam, then it would self clear. Since the computer doesn't go in to a real "BEAM ON" state until 250ms later, it never logged it in the error log as an event. It has been fine ever since. Tom, I hope this might help you on your the problem you had back in April. Thanks again for everyone's assistance. Frank Mertes Divine Providence Hospital 1100 Grampian Blvd. Williamsport, Pa 17701 Phone:(570) 326-8000 Fax: (570) 326-8264 ----------------------------------------------- FREE! The World's Best Email Address @email.com Reserve your name now at http://www.email.com ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: VARiS SQL50 Message-ID: <000501be5439$00f6dcc0$26ca51d1@richard> From: Richard Kimball To: Linac Engineers Subject: Re: VARiS SQL50 Date: Tue, 9 Feb 1999 06:32:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, Have been running VARiS 1.4d for several months...no SQL50 errors...or any other for that matter. It is possible that your problem is with the Sybase installation and not actually VARiS R. Kimball Senior Engineer Univ. of Chicago Hospitals ----- Original Message ----- From: Dave Pinchin To: Sent: Monday, February 08, 1999 9:48 PM Subject: VARiS SQL50 >G'day all, >We are running VARiS 1.4d and are begining to get SQL50 errors. I thought 1.4d was supposed to address these resource issues. Are there other centres out there in Linac Land having the same problems???? Are there any suggestions on fixing them????? > >We have done the obvious... A brand new HP Vectra w 64Mb and NT4 dedicated to VARiS and running 100Mb UTP on a dedicated network is one of the main problem machines. > >Thanks for your thoughts. >DaveP. >********************************************************* >The smallest hole will empty the largest container >unless the hole is for drainage >In which case it will block. >********************************************************* > >********************************************************************** >This email and any files transmitted with it are confidential and >intended solely for the use of the individual or entity to whom they >are addressed. If you have received this email in error please notify >the system manager. > >This footnote also confirms that this email message has been swept by >MIMEsweeper for the presence of computer viruses. > >www.mimesweeper.com >********************************************************************** ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Sterotactic Problem Update Message-ID: From: Steve Nelson To: 'Guy Turner' Cc: 'Linac Engineers' Subject: RE: Sterotactic Problem Update Date: Tue, 9 Feb 1999 05:33:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Guy, The problem may not be your couch. The problem could be that the linac has shifted sideways with respect to the axis of rotation of the couch. I have heard that this is a result of setting the gantry pin throughout the years. If the couch maintains its level through rotation this could be the condition. It takes a good installer/rigger to reset isocenter if this is in fact what has happened. Sorry that I'm late responding to thread, but I've been up to my ears with stuff to do. We also have installed the Brainlab Stereotactic System. I guess that you know Karsten, et al. We also have a walkout around 90 and 270, although ours is less severe than yours. We are within 1 mm of total walkout. (Severe walkout must be called "runout" I guess). I am sure that in our case the problem is that the gantry on our 2100C has moved slightly to the side over its 8 years. regards, Stephen > -----Original Message----- > From: Guy Turner [SMTP:dakota@aeneas.net] > Sent: Monday, February 08, 1999 1:57 PM > To: Linac List Server > Subject: Sterotactic Problem Update > > Thanks to all who responded to my question on the 2300 turntable problem. > I think a general consensus was reached as to what needed to be checked. > The possibilities are: Bearing-to-pit bolts that bottom out before > torquing down the turntable assembly, bearing-to-turntable bolts that are > loose, or a bad bearing. This is a pre-existing problem that I believe > the > BrainLab engineers compensated for in centering their collimator during > installation. Whatever the problem is caused a noticeable change in the > QA > films when I repaired the right angle drive. The short term solution is > to > once again compensate for the walkout by re-centering the stereotactic > collimator that mounts to the wedge mount. The error is consistant and > reproducible. Once that is accomplished we can continue with radiosurgery > and work on the problem as time permits. I will update the list when a > resolution is reached. > > Guy Turner > Enterprise Network Project Manager > Radiotherapy Service Engineer > West Tennessee Healthcare ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian MLC 80 leafs Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net, CJ.de.Bruijne@walcheren.ziekenhuis.nl Subject: Re: Varian MLC 80 leafs Date: Mon, 8 Feb 1999 12:45:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We had heat related solid state failures on our 80 leaf MLC on the HE only. We were loosing PCB's monthly. Since Feb.28/98 when we retro fit cooling fans ,we have replaced 1 Motor Driver PCB and 1 Head Transciever PCB. The LE units seem to run cooler. I believe Varian did have a bad run of boards, but our 80 leaf with its fans is running better than our 52's that don't. We also installed a switch to turn off the MLC head Power Supply at the end of treatment day. Since then we have not had to replace the Infra Red LED's. We had been replacing them about every 10 months and adjusting them every 3 months. We now check them every 3 months during PM's but run 6 to 9 months between adjustments. After 11 months, our 80 leaf Carr A IR beam still puts out 252 mv, gross ; and Carr B puts out 264 mv gross. They could last another couple years at this rate. Dave Burgess Nova Scotia Cancer Centre Halifax, NS, Canada >>> 02/08 10:31 AM >>> About a year ago there was a discussion here about heating problems and aditional cooling of the MLC. Maybe our department wants to update the MLC from 52 to 80 leafs. Do anyone of you still have heating problems, or is this problem solved? Tanks in advance for your reply. Keesjan de Bruijne Ziekenhuis Walcheren / ZRTI Vlissingen, THE NETHERLANDS CJ.de.Bruijne@walcheren.ziekenhuis.nl ! ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Sterotactic Problem Update Message-ID: <199902081855.MAA01315@aeneas.net> From: Guy Turner To: Linac List Server Subject: Sterotactic Problem Update Date: Mon, 8 Feb 1999 10:57:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks to all who responded to my question on the 2300 turntable problem. I think a general consensus was reached as to what needed to be checked. The possibilities are: Bearing-to-pit bolts that bottom out before torquing down the turntable assembly, bearing-to-turntable bolts that are loose, or a bad bearing. This is a pre-existing problem that I believe the BrainLab engineers compensated for in centering their collimator during installation. Whatever the problem is caused a noticeable change in the QA films when I repaired the right angle drive. The short term solution is to once again compensate for the walkout by re-centering the stereotactic collimator that mounts to the wedge mount. The error is consistant and reproducible. Once that is accomplished we can continue with radiosurgery and work on the problem as time permits. I will update the list when a resolution is reached. Guy Turner Enterprise Network Project Manager Radiotherapy Service Engineer West Tennessee Healthcare ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian MLC 80 leafs Message-ID: <457B79AC7AB2D211AAAC006097BDA653062368@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: RE: Varian MLC 80 leafs Date: Mon, 8 Feb 1999 10:22:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I don't think that this *problem* warranted a re-design of OEM cooling efforts. There may have been board problems with some.....but not the many. -----Original Message----- From: Mark Wanlass [mailto:markw@reyes.Stanford.EDU] Sent: Monday, February 08, 1999 11:56 AM To: Richard Kimball Cc: 'Linac Engineer ListServ' Subject: Re: Varian MLC 80 leafs Richard Kimball wrote: > This was never a real problem in my opinion. I have two 80 leaf MLC's from > Varian and do not nor have heard of any other heat related failures. Actually, it was a problem at some sites. The new head tranceciver boards have higher temperature rated chips. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian MLC 80 leafs Message-ID: <36BF2522.9F4C5447@reyes.stanford.edu> From: Mark Wanlass To: Richard Kimball Cc: 'Linac Engineer ListServ' Subject: Re: Varian MLC 80 leafs Date: Mon, 8 Feb 1999 09:55:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard Kimball wrote: > This was never a real problem in my opinion. I have two 80 leaf MLC's from > Varian and do not nor have heard of any other heat related failures. Actually, it was a problem at some sites. The new head tranceciver boards have higher temperature rated chips. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: RE: Varian MLC 80 leafs Message-ID: <457B79AC7AB2D211AAAC006097BDA653062367@radonc-uc-po.mcis.uchicago.edu> From: Richard Kimball To: 'Linac Engineer ListServ' Subject: RE: Varian MLC 80 leafs Date: Mon, 8 Feb 1999 09:26:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This was never a real problem in my opinion. I have two 80 leaf MLC's from Varian and do not nor have heard of any other heat related failures. -----Original Message----- From: CJ.de.Bruijne@walcheren.ziekenhuis.nl [mailto:CJ.de.Bruijne@walcheren.ziekenhuis.nl] Sent: Monday, February 08, 1999 8:31 AM To: linac-eng@plato1.aristotle.net Subject: Varian MLC 80 leafs About a year ago there was a discussion here about heating problems and aditional cooling of the MLC. Maybe our department wants to update the MLC from 52 to 80 leafs. Do anyone of you still have heating problems, or is this problem solved? Tanks in advance for your reply. Keesjan de Bruijne Ziekenhuis Walcheren / ZRTI Vlissingen, THE NETHERLANDS CJ.de.Bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian MLC 80 leafs Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Varian MLC 80 leafs Date: Mon, 8 Feb 1999 06:31:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" About a year ago there was a discussion here about heating problems and aditional cooling of the MLC. Maybe our department wants to update the MLC from 52 to 80 leafs. Do anyone of you still have heating problems, or is this problem solved? Tanks in advance for your reply. Keesjan de Bruijne Ziekenhuis Walcheren / ZRTI Vlissingen, THE NETHERLANDS CJ.de.Bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Stereotactic Radiosurgery Problem Message-ID: <199902072100.PAA08169@aeneas.net> From: Guy Turner To: Linac List Server Subject: Stereotactic Radiosurgery Problem Date: Sun, 7 Feb 1999 12:55:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to get the lists thoughts on the following puzzle. We recently upgraded our 6 year old 2300 C/D with BrainLab's stereotactic radiosurgery equipment. Up until then I had the clutch on the turntable motor drive assy. loosened and the brake disengaged. Guess what - about 6 weeks after the upgrade the right angle drive assy. broke. I pulled the couch and turntable assy., replaced the part and put everything back together. After that the QA films (Winston-Lutz test) show that there is too much walk-out in the couch rotation. For those that are familiar with the test; the little metal sphere is just touching the field edge. The strange part is that at the 90 degree and 270 degree couch positions the sphere is on opposite sides of the cross-hair, which is not what you would expect to see if it were a simple shift of the turntable in the pit. I appologize if there is not adequate detail to get a handle on the problem. My question is; What's up? Anybody have any ideas? Guy Turner Enterprise Network Project Manager Radiotherapy Service Engineer West Tennessee Healthcare ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Vacuum Leak in RF Window Message-ID: <36BB8245.94AD0D6B@earthlink.net> From: Scott King Reply-To: westinc@earthlink.net To: linac-eng@plato1.aristotle.net Subject: Vacuum Leak in RF Window Date: Fri, 5 Feb 1999 15:44:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hey Ron, One way to check out a RF window is to remove any SF6 pressure, take a heat gun to the window and watch the vacuum to see if there is any vacuum activity. Try to keep the heat to the window, if you heat the guide itself you may see some reaction from the crap inside the guide. (When the RF passes through the window it heats it and the leak will increase.) I have fixed this with Vac Seal, spray directly on the FR window and than spray some acetone to help the Vac Seal suck into the hole. I have done this a three time and it worked on two of them for years. Good luck. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Ximatron School Message-ID: <36B5B91B.9AB7AA5B@wfubmc.edu> From: Tim Cullen Reply-To: tcullen@wfubmc.edu To: Linac eng Subject: Ximatron School Date: Mon, 1 Feb 1999 06:24:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I just got back from the varian ximatron school and wanted to give the group alittle update on it. For the most part it was very informative, they have the new CPI generator on the school training unit and the latest version of software on the xim. You get to do alot of troubleshooting of induced "bugs" and the instructor goes over the the electronics and layout of the unit extensively. The class size was small, only four. It was only three of us for the Support course the first week and four for the Tech Maintenance I the second week. You need the first week to make them both blend together. We asked the instructor to test us, and he did at the end of the course. Varian does not require you pass a test, it is just for your own "what did I learn." If you are getting a new Ximatron and are going to be responsible for the maintenance then I'd recommend this class. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: update on HVOC & MOD faults Message-ID: From: Steve Nelson To: 'Linac Engineers' Subject: update on HVOC & MOD faults Date: Wed, 13 Jan 1999 12:53:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, While thinking about my 2100C2 modulator woes, I thought I would fill those of you in who have asked about those intermittant HVOC & MOD interlocks that I have as yet been unable to fix. A few weeks ago I had about an hour of machine time during the day to do some sniffing around in the modulator. This is a summary of what clues I discovered: I found that if I programmed up for some (any) energy, either turned the key on or left it off (without pressing Beam On), then opened and closed a modulator door, the crowbar would release and re-engage (as it should) and sometimes this would generate a HVOC & MOD fault at the console. I was able to generate these false faults many times in succession for a period of about 1 - 2 min. and then without doing anything different I would not be able to generate them at all for about the same period of time. ( I was once later able to generate HVOC and MOD faults just by turning the key ON.) However, during the door opening and closing, the crowbar cycled normally. ( The room doors were open during this test) Another thing that I found was that after programming up as described above and the room doors are closed and the Key was ON, I could open the modulator door and the crowbar would not cycle, and no interlock would be displayed. However, if I tried to beam on, I would immediately get a HVCB interlock and no beam. It turns out that 120vac is being fed back through the ac door switch from some action of the key switch (ready light relay, I presume) . I am not getting ac from the doors because with the key switch off and S1 in the modulator off, there is no voltage at the door switch leads. I think that the bottom line is that I will need to replace the aux power dist./relay backplane and maybe at least some of these problems will vanish. Any bets? I'll let you know at the end of this month. Stephen J. Nelson MSEE Instructor Dept. of Radiation Oncology Medical University of S.C. 803-792-3271 nelson@radonc.musc.edu ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Accelerator Vault Message-ID: <3.0.5.32.19990112133215.00868c10@pop3.concentric.net> From: PracSys Corp To: linac-eng@plato.aristotle.net Subject: Accelerator Vault Date: Tue, 12 Jan 1999 10:32:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Request for Help: I am trying to locate an accelerator vault for the purpose of testing a new particle accelerator. The specs for the vault should be as follows: 1) A minimum of 4 feet of concrete shielding on all sides and ceiling with inside unobstructed floor space of 38ft x 26ft - or - 8 feet of concrete shielding on all sides and ceiling with inside unobstructed floor space of 36.3ft x 23ft. 2) All vault penetrations must be properly shielded. 3) The vault must have minimum floor to ceiling clearance of 8ft. 4) The floor must be capable of handling 1200 lbs./sq.ft. 5) Larger floor space may be required depending on the location and type of vault door used. 6) Access from a loading dock to the vault must allow for transporting equipment that is 16.5ft long, 4ft wide and 6ft tall. Hallways and door openings must accommodate these dimensions. Additional requirements: 1) We would require an equipment room 10ft x 10ft adjacent to the vault. 2) We would require a space for a control room adjacent to the vault with a minimum space of 10ft x 14ft depending on the location of the doors and proximity to the vault. Is there any space like this available? Please contact: Dick Patterson PracSys Corp Ph: 603 890 8555 Fx: 603 890 8558 e-mail: psc1@concentric.net Richard J. Patterson PracSys Corp 8E Industrial Way - Unit 10 Salem, NH 03079 ph: (603) 890 8555; fx: (603) 890 8558 e-mail: psc1@concentric.net ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian MLC Info Message-ID: <004501be3e3c$c2b5b240$a1a051d1@richard> From: Richard Kimball To: Linac Engnieers Subject: Varian MLC Info Date: Tue, 12 Jan 1999 07:03:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I had an interesting thing happen during a calibration of an 80 leaf MLC the other day and thought I would mention it. After making a change to the mlcxcal.txt file, I proceeded to initialize at the controller using mlcx. The system hesitated for a moment, then started scrolling and filling the screen with line after line of text. The last line indicated that carriage B was rejected and the position buffer registers were not responding. hmmmm never saw this one before. I rebooted the computer...it proceeded to verify motcomm board presence..passed...and proceeded to the saw scrolling of error text as before. Strange...as the system was working perfectly before. I verified that I had not made any mistakes in text entry to the mlcxcal.txt file...and tried again, to no avail. After board swaps from A to B and switching fiber links in the controller...my problem still kept popping up. MDIAG told me that comm links were good and would let me control everything without any error... Strangest think I ever saw....it simply would NOT run under mlcx...so I did a DIR of c:\mlcx. This gave me my answer. There was a file named '0' with 0 bytes written moments before the initial error. I deleted this file...and everything went on normally from then on. Fun stuff. :) R. Kimball Senior Engineer U of Chicago Hospitals ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: Varian C series DKB Message-ID: <199901112327.RAA01736@main.aeneas.net> From: Guy Turner To: "Bruijne, Keesjan de" , "'Linac questions (and answers)'" Subject: Re: Varian C series DKB Date: Mon, 11 Jan 1999 12:38:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The DKB's can be repaired. I have only purchased one DKB in 6 years. Now I have a repaired DKB in spares at all times. Guy Turner Enterprise Network Project Manager Radiotherapy Service Engineer West Tennessee Healthcare ---------- > From: Bruijne, Keesjan de > To: 'Linac questions (and answers)' > Subject: DS: Varian C series DKB > Date: Tuesday, December 29, 1998 12:59 AM > > > Hi Richard (and others) > > My excperience with Varian DKB's is that not the plastic keys will break, > but that the 'clicking' function of the layers under the keys disapears. > In six years time we renewed the DKB twice, because of malfunction > of the ENTER key. I dont think there is an other solution. Do you? > > Regards, > Keesjan de Bruijne > Ziekenhuis Walcheren / ZRTI > Vlissingen, THE NETHERLANDS > > CJ.de.Bruijne@walcheren.ziekenhuis.nl > > > > > > ---------- > > Van: Richard Kimball[SMTP:RKimball@radonc-uc-po.mcis.uchicago.edu] > > Verzonden: maandag 28 december 1998 19:00 > > Aan: 'Linac Engineer ListServ' > > Onderwerp: Varian C series DKB > > > > I have been so informed that the just the plastic keys for the console > > dedicated keyboard can once again be ordered from Varian. This was the > > case > > once but was stopped. > > The part number is 00865047-01. Of course this information comes just a > > few > > months *after* I have replaced the entire keyboard due to broken keys :( > > > > Richard Kimball > > Senior Clinical Engineer > > Dept. of Radiation & Cellular Oncology > > The University of Chicago Medical Center > > 773.702.6879 > > ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600C Beam off interrupt. Message-ID: <99Jan7.103513gmt.11650@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: Linac-Eng@plato.aristotle.net Subject: 600C Beam off interrupt. Date: Thu, 7 Jan 1999 02:36:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mark, I can confirm that we were plagued with the occasional "beam off interrupts" also. Fortunately though, I hope we've seen the last of them. They first started to appear when we upgraded from Rel 3 to 5.2. And yes , I went through the old "swap this board, swap that board" routine - to no effect. The problem appeared to be happening at the end of a beam so I presumed that it may have been a combination of a timing plus noise situation. At that time we had two HT contactors fitted to our 600C (part of UK spec for 6/100 - since upgraded to 600c) The pull-in detection switch was not wired in on the extra contactor incidentally. The three phase to the secondary contactor passed in close proximity to the stand patch panel. I guessed that noise induced in the cables at beam off was not helping matters and may have been contributing to the intermittent problem. We upgraded to Rel 5.4 + Dell and the Beam off interrupt 03 disappeared, only to be replaced by another version of Beam off interrupt - I can't remember which now! As the extra contactor was not really required on a 600C, we removed it.(With Varian's authorisation!!) After this point we haven't had another BOI. My PERSONAL opinion (before someone gets the huff) is that Rel 5 onwards is very timing critical. If you happen to have a noisy machine (like ours) and Rel 5, then chances are you may experience "Beam off interrupts". I believe Tim Cullen had similar experiences - perhaps you can have a chat with him. Best Regards and a Happy New Year to all, Chris Forrest Cookridge Hospital Leeds U.K. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: 600c intermittent fault Message-ID: <2d61446e.3693a217@aol.com> From: RvrRtMark@aol.com To: linac-eng@plato.aristotle.net Subject: 600c intermittent fault Date: Wed, 6 Jan 1999 09:49:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, Once in a great while I am getting a controller fault that shows up on the event log as "beam interrupt missing." I tried replacing the timer interface pcb to see if that would stop it but it returned about 2 weeks later. I'm wondering if the old PS/2 could have a hand in this. The serial number on this linac is 189 and like I said it has the old IBM PS/2 power supply. Has anybody seen this before? Thanks in advance! Mark Brideson RAS Sacramento, Ca. ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Varian MLC Shaper Digitizer Message-ID: <3.0.1.32.19990105124313.011a2710@pop.channel1.com> From: Martin Fraser To: linac-eng@plato.aristotle.net Subject: Varian MLC Shaper Digitizer Date: Tue, 5 Jan 1999 09:43:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is not Linac issue, but related. Hope it's useful to someone. ....... We learner an interesting little fact yesterday regarding the spark pen used with the GP9 sonic digitizer (such as that provided with the Varian MLC Shaper) which may be news to some. After a power interruption we were unable to perform a calibration with the pen (when we try to enter the origin, the screen prompt jumps to the 'corner points' and calibration fails), though the mouse would work OK. we replaced the pen, no luck. Replaced the whole unit - STILL no luck ?! - then my Service engineer Eric discovered that if you power up the unit with the pen attached but OUTSIDE of the range of the microphones then the calibration will fail in the manner described. Since we never turned the unit off, we never discovered this little 'feature'. regards, Martin Fraser ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Re: UNDR,XSDR,MOD interlocks Message-ID: <369110A5.D3781D7E@directcon.net> From: dave brown Reply-To: dbrown@directcon.net To: "Wilson, Jim" Subject: Re: UNDR,XSDR,MOD interlocks Date: Mon, 4 Jan 1999 11:04:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Jim We have four 2100's out here in Sacramento Ca, so I'm very interested on what the resolution to your problem was. Would you please get back to me/us as to how you fixed this problem. Thank You Dave Brown "Wilson, Jim" wrote: > Gentlemen, > I would appreciate your comments on a problem I am having with > my Cl-2100c. I am getting intermittant MOD faults on 18x, (3-4/day). > Also, 18x and I am told occasionally 6x has a low dose rate and then a > sudden increase which causes an XSDR fault. Also my RF drive wave- form > really goes to pot with beam on. The ugly RF drive waveform is present > regardless of how well the machine runs. I believe the RF driver is okay > as I had it rebuilt recently. I also had the opportunity to slip another > RF driver into the machine and I see the same intermittant problems. > Any input guys? > > Jim Wilson > Providence St. Vincent Hospital ------_=_NextPart_000_01C19966.172FB140 Content-Type: message/rfc822 Content-Description: Update Message-ID: <9901041044431G.02746@webc01.globecomm.net> From: fmertes@email.com To: linac-eng Subject: Update Date: Mon, 4 Jan 1999 07:44:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank you for all your input on my latest beam on problem. I called Varian in to help. I did find that slightly tapping on the Auxiliary Power Dist. PCB supporting frame with the handle of my screwdriver, after I would get the clinac to beam on, would beam off the clinac without any interlocks. After a day of troubleshooting together we ordered the Auxiliary Power Dist. PCB. We ordered this because the Varian rep. seen simular problems like mine, slightly different though, where this pcb fixed the problem. He stated that he has not been able to find the problem with this board though. It is a multi-layered board. So again thanks to all, and I hope this will help someone else out. Happy New Year to all! Frank Mertes Divine Providence Hospital 1100 Grampian Blvd. Williamsport, Pa 17701 Phone:(570) 326-8000 Fax: (570) 326-8264 ----------------------------------------------- FREE! The World's Best Email Address @email.com Reserve your name now at http://www.email.com