Reports until 04:29, Thursday 31 July 2025
H1 General (SQZ)
thomas.shaffer@LIGO.ORG - posted 04:29, Thursday 31 July 2025 (86113)
Ops Owl Update

Was notified just after we got to low noise, the SQZ FC couldn't lock. Following the wiki help intructions, flashes on H1:SQZ-FC_TRANS_C_LF_OUTPUT were low so I tried moving FC2 to get them higher. Looking at the camera wasn't really helpful. I was only able to get it to lock with values around 30, and no matter how much I moved FC2 I couldn't get this to increase. When the SQZ_FC node tries locking it would get values there around 80, not sure whats different. 

I tried trending FC2 and 1 to see if they moved in the earthquake but they were right where they were last lock. I took a break from scouring the alog and tried to manually move FC2 around again, and while I was waiting between moves, the trans output jumped to 55. I then moved FC2 some more it maxed it out at 94. When I tried to have it lock again though, it still couldin't hold lock.

I tried adjusting the OPO temp, via the SQZ_OPO_LR guardian, since that worked for Oli on July 9 (alog85660). This also didn't seem to help things out.

I let the SQZ guardian keep trying while I read some more alogs for clues and then it eventually just stayed locked and we went into observing. The FC trans output was still around 80 though, so I'm not sure this will hold, but I'm hoping!