ibrahim.abouelfettouh@LIGO.ORG - posted 00:02, Sunday 09 July 2023 - last comment - 14:53, Friday 21 July 2023(71164)
OPS Eve Shift Summary
TITLE: 07/09 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 141Mpc
SHIFT SUMMARY:
IFO is LOCKED and OBSERVING - now for 48 hours and 35 minutes and counting, O4 record!
Other:
Squeezer unlocked without unlocking full IFO, which knocked us out of observing briefly, but quickly and automatically recovered within three minutes, putting us back in observing. This resulted in a data gap in GWISTAT during this time (4:34:38 UTC to 4:37:12 UTC), which was communicated on the RRT O4 mattermost channel and on teamspeak upon clarification.
LOG:
Tagging TCS: Out of observing 07:47 - 07:48 UTC as the CO2X laser unlocked, see attached. This happened on 06/28 too 70910. Unsure why, the PZT doesn't seem to be drifting out of range it just quickly drops, see attached.
Tagging SQZ, this is an old alog of SQZ_MANAGER taking us out of observing 2023/07/09 04:34UTC for 1m51s. This looks to be because the SQZ_SHG got to 0V and ran out of range, attached plot.
We do have a checker in LOCK_SHG and SQZ_READY_IFO to check H1:SQZ-SHG_PZT_VOLTS is between 15V and 85V 70076, but this was 46 hours into the lock where SHQ_PZT started at 40V so editing the checker wouldn't help here. We just need to stop the slow drift, LVEA temp is steady during this time.
>> guardctrl log -n 500 -a "2023/07/09 4:34:00 UTC" -b "2023/07/09 4:37UTC" SQZ_SHG
2023-07-09_04:34:37.763756Z SQZ_SHG [LOCKED.run] USERMSG 0: PZT voltage limits exceeded.
2023-07-09_04:34:37.825851Z SQZ_SHG JUMP target: SCANNING