At the beginning of the shift H1 had a lockloss during late stages of ISC_LOCK where we slowly stepped through states and found the lockloss occurred at CLOSING BEAM DIVERTERS (see Elenna's alog 87961).
Took a couple of locking attempts for H1 to return to this same point of ISC_LOCK locking. (during this time is when Jenne noticed/addressed the Power Scaling issue (see alog 87965).
While locking chatted with Oli and they mentioned for some of their locklosses, they would go state by state, but ALSO if there was a 1Hz ring-up during these states, they would go to "ASC HiGn" AND then wait there a few minutes until the 1Hz ring up (seen on the PR_GAIN channel on PRMI.sb of nuc30 + ASC-INP1_P_INMON on nuc29).
So for this 2nd attempt of getting through CLOSE BEAM DIVERTERS this shift, went through the states:
- 0323 LASER NOISE SUPPRESSION --no issues observed
- 0325 ADS TO CAMERAS--this is where the 1Hz ring up occurred.
- 0327 ASC HiGn engaged!
- note: have to enter "y" (not "Y")
- Waited about 4min---basically watched the ring up noise disappear and return to quiet levels
- 0331 ASC Low Noise engaged!
- 0333 INJECT SQUEEZING
- 0332 - 0337 Closed the Beam Diverters by hand per Jenne's suggestion---> Able to close all of them (even HAM1's POP shutter which we feared would cause the lockloss).
- Then continued through the remaining ISC_LOCK states.
Made it to NLN, but could not go to Observing for (2) (I believe) separate reasons.
1) SQZ_OPO_LR: "CMB EXC is ON" and SDF Diffs (see attachement #1). For the SDF Diffs, I reverted these with no problems.
At this point, I tried to go to OBSERVING, but could not.
2) Then noticed for SQZ_PMC, we had the notification: "PMC PZT volts low". Thought I would address this, but then I was able to take H1 to OBSERVING, so I kicked the can and went to OBSERVING instead of addressing the low voltage. See attachement #2 for PMC Voltage over the last week. Still have the notification for the low pmc voltage.
