chandra.romel@LIGO.ORG - posted 11:54, Wednesday 30 October 2019 - last comment - 10:12, Thursday 31 October 2019(52810)
HAM6 RGA scan
Kyle prepared a new Prisma Plus RGA for HAM6 chamber by baking it remotely prior to installation during Oct. vent. Background is pristine and includes a 10 l/s ion pump to preserve vacuum during chamber vents and also two calibration gas bottles.
Yesterday we had a chance to finally scan HAM6 chamber at total pressure of 9e-7 Torr. RGA was in SEM mode and filament was warmed up for several hours. Scan attached.
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Note that the RGA assembly's 10 l/s ion pump is on (using as interium pressure gauge while PT110 is offline) here and has a comparable net pump speed as the conductance to HAM6. As such, a factor of ~2 bias exists. If it were off, as would be nominally the case, the peaks would be ~twice as large as shown.