Spent the past two days with SAES Getters reps to commission the new high vacuum NEG pump (HV1600-10 NexTorr) installed on BSC6 at EY. We activated the pump yesterday and ran it nominally at 180C overnight. This morning we valved it into the main volume. Attached is ~2day plot. The pressure improved with the NEG+IP valved in. We were scanning the RGA during the transition of valving the pump in today and saw no change in partial pressures immediately. Over hours H2 fell by ~30%. I will attach RGA scans next week.
We tested the 50 m cable this afternoon with the power supply in the adjacent mechanical room. It powered up ok but I found it faulted when I went back later to check on it and the temperature dropped from 180C to 46C. It seemed to turn back on OK. Will check it one more time before I leave. It can run cold, but won't be as effective. The error message read: Global: 202 - Main Line Wrong Voltage. Touch this bar to clean the alarm.
We also activated the CapaciTorr NEG pump on BSC6 while we were out there, but left it valved out. Before activating we pumped out with cart the Ar, etc gasses that built up over months during the EY vent, which caused the pressure to creep to e-4 Torr.
Plot legend: PT-428 is hot cathode (HC) IG on HV NEG housing; PT-410B is CC on BSC10; PT425 is HC on BSC6.
Next time we vent EY, we should expose this pump to pressures at e-4 Torr to test its capacity.
Found PS faulted again. I moved it into VEA and used short cable that is proven to work. May need to send 50 m back or make an adjustment in voltage parameter. Should have tested first before we pulled it. Sorry G.
Note that if the IP cable feels the slightest bump it gives an arcing error on its PS. It will continue to work but can be reset by rebooting.