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Message ID: 94     Entry time: Wed Mar 31 20:46:22 2010
Author: Frank 
Type: Misc 
Category: RefCav 
Subject: ion pumps 

i've made a cable to test the two Varian ion pumps we have.  Before we move the cavity to the new chamber i would like to bake it and pump it using one of those pumps to see if everything is ok. Unfortunately we don't have a driver and a cable for those pumps. So i made a cable to use it with a Stanford high-voltage power supply. I hooked up the first pump to a test setup and it seems to be ok, but the valve i used is leaking so i gonna replace it by a spare one from 40m i got this afternoon. I will test the second one later. So as at least one is working we should buy a driver for that pump, maybe a used one or so. Right now we don't have any spare pump at all. Unfortunately the pumps used for the current chambers are different too ( totally different drivers and pumps), so we can't replace the failed part easily. I don't think that we have to worry but it might be handy to have one, e.g. if we want to use the third chamber to design and test the in-vacuum thermal shields.

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