kyle.ryan@LIGO.ORG - posted 15:05, Tuesday 04 September 2018 - last comment - 15:13, Tuesday 04 September 2018(43818)
IP5 isolated for a few minutes
IP5's pump current is noticeably higher than any of the other 2500 l/s ion pumps that are pumping from the Corner Station. So, today, I valved-out IP5 for 10 - 15 minutes so as to observe the response. The increase in Corner Station pressure (as shown in IP1's pump current) is attached. This implies that IP5 is "seeing" a higher than typical gas load and that this is coming from the YBM-side of its 12.8" gate valve. Hmmm......
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We will leak check the beam tube side of IP5's isolation gate valve next Tuesday. I dug through old log entries to see if we explicitly mention doing this and this aLOG is all I found which isn't clear if BT side was checked. https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=41296