TITLE: 11/10 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 159Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:
- Lockloss @ 0:40 UTC, cause unknown
- Took the opportunity to reload the HAM2 ISI GDS TP while we were down
- Alignment looked horrible, so will be running an initial alignment
- Had to manually touch the EX suspensions for ALS
- H1 lost lock at 25 W, DCPD saturation
- Upon relocking, I noticed the violins were horrendous, thinking that might be why we're having issues relocking
- DCPD counts were at 1.5 m at OMC WHITENING on the third lock acquisition, will hold there to wait for violins to damp
- Back to NLN/OBSERVE @ 3:55, attached are some ALS EY SDFs which I accepted
- Superevent S231110g
- 4:06 - inc 5.9 EQ from Indonesia
- Lockloss @ 5:27 - cause unknown
- Relocking was automated, reached NLN/OBSERVE @ 6:46 UTC
- Did have odd saturations in DRMI LOCKED CHECK ASC for PRM/3 and MC1/3 - haven't seen those before
LOG:
No log for this shift.
Looking at the DCPD signals during the 25W state before this evening LL, during the LL and the next 25W relock, they looked typical (~8-12k) during the LL but there was a weird glitch like halfway through the states duration and they were diverging when the final glitch and LL occured. The relock after the 25W LL had higher DCPDs signals, ~40k higher than usual, and the previous lock also had higher than usual DCPDs at this state, which were damped down over the long lock. So something caused them (particularly ITMY modes 5/6, and 8... the problem childs) to ring up during the following lock aquisition from the 25W LL, they didn't have enough time to damp down during this lock and so after the 5:27 LL they were still high during aquisition.
