aLIGO LHO Logbook

H1 General

cheryl.vorvick@LIGO.ORG - posted 00:07, Friday 14 February 2020 - last comment - 00:39, Friday 14 February 2020(55091)

OPS Eve Summary

TITLE: 02/14 Eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 119Mpc
INCOMING OPERATOR: Patrick
SHIFT SUMMARY: locked all shift
LOG:

03:18:51 - H1 out of Observe
- no change to H1, see alog 55090
03:20:19 _ H1 in Observe
06:10:59 - H1 out of Observe
- unlocked/relocked SQZ
06:14:14 - H1 in Observe

Comments related to this report

cheryl.vorvick@LIGO.ORG - 00:39, Friday 14 February 2020 (55092)

Link

Damped ETMY modes 12 and 20. Attached plots show the past 8 hours and a zoom in on gains while damping modes 12 and 20.

Mode 11 was turned off by guardian, left off, tried damping with nominal gains, rung up mode 12
mode 12 damped with -60deg phase (matches mode 20), was able to increase mode 12 gain to 4 (mode 11 gain = 0)
- ETMY mode 12 FM4, -60deg phase, unmonitored in SDF
mode 18 damped with less gain, 5 instead of 10
mode 20 damped with a gain of 1.7, but started at 0.1, then increased in steps of 0.1-0.3
modes 12, 18, and 20 damped with these settings at the same time (previously mode 18 damping had to be off to damp mode 20)
reduced gains on other modes that had low RMS
bonus, violin peaks at 1.5K reduced
all damping restored to nominal

Images attached to this comment