Reports until 20:43, Wednesday 03 July 2024
H1 General
ryan.crouch@LIGO.ORG - posted 20:43, Wednesday 03 July 2024 - last comment - 20:55, Wednesday 03 July 2024(78854)
OPS Wednesday EVE shift update

Currently relocking at TRANSITION_FROM_ETMX

Following a lockloss at LASER_NOISE_SUPPRESION, XARM started having PDH issues and looked extremly fuzzy. ALS_X PDH kept locking and unlocking. After a bit of letting guardian try and adjusting ETMX, TMSX and getting no gains (the DIFF beatnote was -14) I dropped to do a MANUAL_IA thinking that the input align might still be off. I ended up adjusting IM3 and IM4 again which reduced the fuzz and reduced the PDH unlockings frequency, touching PR2 further stabilized it. After lots of trying to walk the IMs, PR2, and PR3 (reverted after no gains) and XARMs signals still not being able to converge I skipped ahead to INPUT_ALIGN and ran into the same issue from earlier today at ACQUIRE_XARM_IR and I had to move IM4 more to more center it on POPA which got the automation to kick in and do the rest. I finished the IA to be safe and then I was able to lock ALS (XARM is still fuzzy but not nearly as much and the PDH didn't unlock) and move on finally.

I wonder if the DARK offsets need to be updated based off  alog76982 which describes similar behavior to what I saw during this IA, light on LSC-TR_X when there shouldn't be during ACQUIRE_XARM_IR.

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ryan.crouch@LIGO.ORG - 20:55, Wednesday 03 July 2024 (78855)

Lost lock LASER_NOISE_SUPPRESIOIN again right after the ISS 2nd loop turns on. XARM looks bad after each lockloss as well.