thomas.shaffer@LIGO.ORG - posted 09:34, Monday 12 October 2026 (92276)
Morning locking notes
Initial alignment
ALSY alignment was very finiky this morning. I ran a scan alignment which brought the power up to 0.8. Then when I went to improve by hand, it seemed like there was no combination of ETMY and TMSY that would increase the power past 0.8 and make the pitch on the camera better. I moved ITMY around a bit, which didn't seem to help at first, but then after going back to ETMY and TMSY again, suddenly a small change in TMSY made the power jump up to 1.0. I then touched up yaw and tried locking, but it didn't want to stay locked. I made one more minor (2 clicks) change in ETMY Y and then it stayed locked after a few tries.
COMM and DIFF beatnotes at -3 and -9 at this point
After input align the IMC lost lock as usual, then 1.5 min later the JAC lost lock and didn't relock for minutes until I brought it's guardian to Down and then back to Locked. The IMC still took another 5 minutes to lock.
No issues with PRC, MICH dark, SR2. SRY I had to move SRM in pitch ~40-50urads to lock.
Locking locking
SRC1 & 2 P are still off, so I stopped at Engage_DRMI_ASC and touched up SRM P before moving on.