ryan.crouch@LIGO.ORG - posted 07:27, Tuesday 19 September 2023 - last comment - 09:48, Tuesday 19 September 2023(72955)
Lockloss at 09:26TUC
The IFOs been struggling to relock following this LockLoss. It couldnt find DIFF IR a few times and I had to intervene (I only had to tap DIFF offset once or twice and it found it) and I ended up doing an initial alignment as it couldn't get
past PRMI, we spent about 10 minutes in CARM_TO_TR before it said "NO IR IN arms" after the IA. It lost lock shortly after at 14:24UTC.
Each relock seems to have the same trouble with DIFF IR, it being just 1 or 2 taps away but saying NO IR found
Lost lock at CARM_TO_TR again
The issue was it not actually finding IR and it rushing through CHECK_IR, so the solution would be to hold it CHECK_IR and let it fully find it and settle before moving on.