Reports until 00:24, Sunday 28 April 2019
LHO General
patrick.thomas@LIGO.ORG - posted 00:24, Sunday 28 April 2019 (48826)
Ops Eve Shift Summary
TITLE: 04/27 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Jeff
SHIFT SUMMARY:

Spent entire shift trying to relock. Did not get past ENGAGE_SOFT_LOOPS.

- Winds were high in the beginning of the shift. Tried initial alignment with WINDY_NO_BRSY, since the BRSY was damping for a long time.
- SUS SRM watchdog tripped 3 times during the shift.
- Could not get IR to lock on X arm in initial alignment. Tried twice, the second time after the wind came down. Skipped and continued with rest of initial alignment.
- SRM was way off in yaw, according to witness sensors. Had to move it back to get SRC to converge in initial alignment.
- Have gotten as far as ENGAGE_SOFT_LOOPS by setting H1:ASC-SRC1_Y_GAIN to 0 in ENGAGE_ASC_FOR_FULL_IFO before it lost lock.
- Was able to improve signals by adjusting SRM with ASC SRC gain off in ENGAGE_SOFT_LOOPS, but not enough to keep it from driving off when setting the gain back.
- Started adjusting PRM in ENGAGE_SOFT_LOOPS. Looked like I was making progress, but then lost lock.