Reports until 16:21, Wednesday 22 October 2025
H1 General
ryan.crouch@LIGO.ORG - posted 16:21, Wednesday 22 October 2025 - last comment - 18:23, Wednesday 22 October 2025(87657)
OPS Wednesday EVE shift start

TITLE: 10/22 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 21mph Gusts, 17mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.30 μm/s 
QUICK SUMMARY:

Comments related to this report
ryan.crouch@LIGO.ORG - 17:52, Wednesday 22 October 2025 (87664)
Link

00:43 UTC We reached OMC_WHITENING where we will sit to damp violins for a bit.

ryan.crouch@LIGO.ORG - 18:07, Wednesday 22 October 2025 (87666)SUS
Link

IX13 has been the problem mode, I've set its' gain to 0 in lscparams and reloaded the VIOLIN node. I think I have found a new setting for IX13, I changed the phase from -60 to-30 and used a negative gain. Its damping, slowly...

ryan.crouch@LIGO.ORG - 18:23, Wednesday 22 October 2025 (87668)
Link

We've also noticed that the ETMY roll mode is ringing up, turning off the damping made it ringup faster.