aLIGO LHO Logbook

H1 General

cheryl.vorvick@LIGO.ORG - posted 08:14, Sunday 23 February 2020 - last comment - 09:23, Sunday 23 February 2020(55240)

OPS Owl Summary

TITLE: 02/23 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 105Mpc
INCOMING OPERATOR: Patrick
SHIFT SUMMARY: H1 locked in Observe all shift
LOG:

11:46:57 - DCPD verbal alarm
11:55:37 - DCPD verbal alarm
13:17:19 - verbal alarm for EQ, did not set SEI to EQ mode

Comments related to this report

cheryl.vorvick@LIGO.ORG - 09:23, Sunday 23 February 2020 (55243)

Link

Violin Damping - damped ETMY mode 12 and then mode 20 - setup for this was:

damping mode 12:
- gains set to zero on ETMY modes 11
- -60deg phase engaged on mode 12
- gain on mode 12 started at 1, then increased as the mode damped, gain = 1, then 2, then 6, then 10
damping mode 20:
- gains set to zero on ETMY modes 11, 12, and 18
  - Modes 11 and 12 have broad damping filters that overlap with mode 20, preventing the damping of mode 20 (modes 11 and 12 need updated damping filters)
  - gain on mode 18 set to zero since this peak was damped, and it's damping filter also interacts with mode 20's damping filter
durnind damping of mode 12 and 20, gains set to lower values on ETMY modes 13, 14, and 15
- the lower gains were in use most of my shift, through multiple glitches, and the mode's RMS have remained low
  - modes 13 and 14: each damped with a gain of 20
  - mode 15 damped with a gain of 5
all gains and the -60deg phase filter on mode 12 are reverted