ryan.short@LIGO.ORG - posted 07:45, Saturday 28 September 2024 - last comment - 09:06, Saturday 28 September 2024(80339)
Ops Day Shift Start
TITLE: 09/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 7mph Gusts, 6mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.27 μm/s
QUICK SUMMARY: H1 just lost lock at 14:16 UTC, 8:34 into the lock stretch. I don't notice anything obvious as to the cause except maybe some ETMX motion immediately prior, but this doesn't look like one of the ETMX "glitches" like we've seen before. Have been trying to lock green arms for 30 minutes, so I'll start touching them up by hand.
- Wind is low, microseism is on its way down
- All other systems nominal
DIAG_MAIN is reporting "TCS_LASER: Y power too low," and that seems to be the case since the CO2Y laser relocked at 10:13 UTC this morning, when the laser output dropped from 30.20W to 29.94W (screenshot attached, tagging TCS).
This caused H1 to drop observing for only about a minute and a half.
H1 back to observing at 16:05 UTC. Fully automatic relock after running an also automatic initial alignment.