thomas.shaffer@LIGO.ORG - posted 07:38, Tuesday 04 November 2025 - last comment - 09:41, Tuesday 04 November 2025(87933)
Ops Day Shift Start
TITLE: 11/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 8mph Gusts, 5mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.29 μm/s
QUICK SUMMARY: Violin modes are very rung up, although our violin monitors dont agree with that. Our range has been very low for the past 2 hours, as if the squeezer isn't squeezing. While the magnetic injections are running right now, I don't think they are getting anything useful. Still trying to figure out what's going on.
Maintenance day today.
Looks like this happened to Ryan C last night as well - alog87930. I did just as he did and turned off the damping to violin ETMX modes 1&6, and the saturations went away and DARM looked better. The 500Hz line in DARM is still very elevated, but the harmonics are much lower and the DCPDs are no longer saturating.
Now that the gains are off, the monitors are making more sense for those modes. They immediately went up when the gain was turned off.
SUS in lock charge is running and should be good, at least for the latter half of the measurements.
I've set the gain of ETMX mode 1 to zero in lscparams for now.