aLIGO LHO Logbook

H1 General

oli.patane@LIGO.ORG - posted 07:37, Monday 02 December 2024 - last comment - 12:47, Monday 02 December 2024(81574)

Ops Day Shift Start

TITLE: 12/02 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.46 μm/s
QUICK SUMMARY:

Observing and have been Locked for over 2 hours. Secondary useism looks to be going up a bit in the past few minutes.

Comments related to this report

oli.patane@LIGO.ORG - 10:45, Monday 02 December 2024 (81578)Lockloss

Link

Lockloss from last night - December 02 @ 11:48 UTC

Last night's lockloss has some interesting things happening right before the lockloss.

For one, ASC-AS_A drops down without first going up, similar to what we call an IMC lockloss, but the IMC lost lock 250ms after instead of within the threshold for the IMC tag, 60ms, so this is not a lockloss where the IMC loses lock before AS_A.
There are large oscillations seen in all QUADs in the two seconds before the lockloss. For ETMY at least, the largest amount of movement seems to be in Yaw.
Large oscillations are also seen in LSC-REFL_A_LF_OUT a couple seconds before the lockloss
Larger oscillations seen in almost every ASC control channel

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