Showing posts with label PPMS. Show all posts
Showing posts with label PPMS. Show all posts
Thursday, September 27, 2007
PPMS cryopump regeneration
We have been having a lot of trouble with the PPMS cryopump. The manual claims we should only need to regenerate the pump once every 500 uses, but we are needing to regenerate every ~30 uses. Ernest at QD says that, every time we regenerate in dewar, we should run the regeneration command 5 or 6 times, and every time we regenerate out of dewar, we should run it 4 times, then do an in dewar regneration after finishing the out of dewar regeneration. I've modified the regeneration sequences accordingly, and we should all remember to do an in dewar regeneration after finishing an out of dewar regeneration.
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