Reports until 10:51, Wednesday 24 May 2017
LHO VE
kyle.ryan@LIGO.ORG - posted 10:51, Wednesday 24 May 2017 - last comment - 20:30, Wednesday 24 May 2017(36371)
RGA scans of Vertex+YBM+XBM just prior to opening GV5 and GV7
Vern S. asked that I post these scans so as to make them available for review to all who are interested prior to opening GV5 and GV7.  So, here they are. 

h0rgacs_SEM_analog_05242017a is a scan of the combined Vertex+YBM+XBM volumes while they are being pumped via IPs1-6.  Note that, for this scan, I am running 1mA filament current and 1300V SEM voltage.  For scan h0rgacs_SEM_05242017b I reverted the settings back the Quadera default of 2mA filament current and 1500V SEM voltage.  I think that the scans that Chandra R. had taken prior to this vent exercise had used the as found Quadera default settings.  As such, if you are comparing "before" to "after" scans, you will want to use h0rgacs_SEM_05242017b.
Non-image files attached to this report
Comments related to this report
kyle.ryan@LIGO.ORG - 10:54, Wednesday 24 May 2017 (36372)
I forgot to mention that PT120 was indicating 6.1 x 10-8 torr at the time of these scans and that everything is/was in temperature and pressure equilibrium etc...
kyle.ryan@LIGO.ORG - 16:04, Wednesday 24 May 2017 (36392)

For comparison, the partial pressure of water is x20 higher in today's h0rgacs_SEM_analog_05242017b scan than that of the comparable scan taken just before venting.  This is the "price" of opening early!
chandra.romel@LIGO.ORG - 20:30, Wednesday 24 May 2017 (36402)

I used 1300 V (and default 2 mA).