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Message ID: 118     Entry time: Mon May 10 00:29:04 2010
Author: Frank 
Type: Misc 
Category: RefCav 
Subject: ion pump current still too high 

i checked the current of the ion pump. It's still at 75uA, much too high. So i think i have a tiny leak somewhere but i can't find it using isopropanol and we don't have a leak detector. The only changes from the bakeout setup are one of the windows, the replaced ion pump and the feedthrough for the temp sensor. I will wait some more days but my guess is that it won't be much better. It's already pumping for one week. If it doesn't change i will start replacing/checking the feedthrough seals and the ion pump. If that doesn't help it can only be the large window. That's in fact the only part never been tested before, all other parts were attached to the old or the current chamber before and OK.

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