chandra.romel@LIGO.ORG - posted 10:50, Thursday 29 March 2018 - last comment - 11:29, Thursday 29 March 2018(41207)
vertex pressure stuck
Vertex pump down is not trending down (just one turbo is pumping since X&Y beam manifolds are vented. Attached is plot over 10 days.
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The big jump from last Friday was a result of closing GV2 to vent XBM. It could be that both GV2 gate o-rings are leaking. It looks like at least one is (see earlier log entry about trying to pump gate annulus with AIP). We have experienced dual gate o-ring leaks (GV12). Will know more when we pump down XBM - maybe tomorrow.