camilla.compton@LIGO.ORG - posted 19:41, Thursday 28 November 2019 - last comment - 21:38, Thursday 28 November 2019(53556)
H1 Lockloss
03:11 Lockloss. No obvious reason. I was out the room but we had "Commissioning" 5 seconds before "DOWN" on verbal alarms and the DIAG_MAIN user message around that time was "Fast shutter HV not ready"
03:17 IR was not found but ISC_LOCK continued anyway. Is that strange?
03:22 GRB Long notification received (no need to stand down even if we were observing)
03:24 Lockloss #2 at CARM_OFFSET_REDUCTION (lockloss happened here earlier: alog 53552)
03:32 Lockloss #3 at FIND_IR
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camilla.compton@LIGO.ORG - 20:56, Thursday 28 November 2019 (53557)
03:50 Message "IR not found" but then it quickly continued and locked DRMI, maybe I should have been quicker and stopped it to manually adjust IR alignment here?
03:56 Lockloss #5 at SHUTTER_ALS. Just before this lockloss can see ASC_DHARD channels have a strange change in them just before lockloss (photo: lockloss5)
04:08 Lockloss #6 at DARM_TO_RF
This time I try to get better IR flashes, adjust COMM and DIFF but still struggle to get consistent DIFF signal.
04:30 Lockloss #7 at CARM_OFFSET_REDUCTION. The ASC_DHARD channels have the same signal as in lockloss 5 (photo: lckloss7). Addionaly, the SUS ETMX UIM/L1 outputs that Jeff adjusted (alog 53540) got up to 140,000 before this lockloss (photo: lockloss7) so if we loose lock aagin I think I will try revetring these changes.
04:34 Started inital alignment
INITAL_ALIGN got again stuck at OFFLOADING_GRREN_WFS so I again manually took ALS_X/YARM to UNLOCKED (as worked in alog 53552)
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camilla.compton@LIGO.ORG - 21:30, Thursday 28 November 2019 (53558)
Good job! And... thank you!