Gun Prepare Set

By Frans Sturm.

Gun Prepare Set



At our radiation department we have eight linacs in clinical use.

So it's good to have a clean and outgassed electron-gun standby.

That's why we built this Gun Prepare Set.

On this picture you can see  the Gun Prepare Set.

It exists of a stainless steel cross-piece tube, on which we mounted an ion getter pump,

a "Penning" vacuum gauge, a valve to evacuate the system with a separate turbopump assembly

and the electron-gun.








Here you can see the adaptor to mount the gun to the cross-piece.

The adaptor has an angled viewport, through which you can inspect the gun-filament.

        

It's important to observe the gun-filament while it's glowing, to check if it keeps its shape when it gets hot.

NEVER look at the glowing filament with UNPROTECTED EYES, use for example a welding mask.






This photograph pictures the whole Gun Prepare Set trolley.

After having the filament glowing and baking out the whole vacuum system, the vacuum rate was about 3,5 e-8 mbar.

Vent the prepare set with dry nitrogen when you have to dismount the gun. Also vent the linac with dry nitrogen,

this ensures a quick recovery of the vacuum in the accelerator tube.


Suppliers:

Thanks to the mechanical workshop FGI of the Vrije Universiteit, Amsterdam,

(www.few.vu.nl/organisatie/dienst/technisch/fmgt)

suppliers of  most of the vacuum parts and manufacturer of the adaptor.



Interested? Questions?

You want to have further specifications?

Please feel free to contact us:


Frans Sturm

Dpt. of Radiotherapie, University Medical Centre

Utrecht, The Netherlands.

(+ 31) 30 - 250 8456

f.c.sturm@azu.nl

or:


Jan Kok

j.g.m.kok@umcutrecht.nl