chandra.romel@LIGO.ORG - posted 09:45, Friday 17 June 2016 - last comment - 22:08, Friday 17 June 2016(27806)
CP5
Raised CP5 Dewar pressure (3/4 turn at pressure regulator + 1/4 turn yesterday). Will take days to read a pressure response. Current pressure is 17.5 psi in tank and 15 psi at exhaust. Also filled CP5 to 100% with 1/2 turn open on LLCV bypass valve.
CP5 "setting % open" has been shifting upward. The vacuum team is working to try to get it under control. Last week such setting was around 88% now is oscillating around 100%.
Note to operators if "cryopump level % Full" falls below 88% it will be very hard for the current system to bring it up to nominal (92%), if it does reach that point, feel free to call a member of the vacuum team, the cryopump will need manual filling.