aLIGO LHO Logbook

H1 General

cheryl.vorvick@LIGO.ORG - posted 17:13, Sunday 03 November 2019 - last comment - 06:41, Tuesday 05 November 2019(52946)

OPS Day Summary

TITLE: 11/04 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 115Mpc
INCOMING OPERATOR: Patrick
SHIFT SUMMARY: H1 in Observe, instrument air pumps for LVEA are working, SQZ just fixed itself, causing an increase in range
LOG:

VACUUM:

15:06:24 - first vacuum alarm for PT199
15:19:42UTC - JeffB turns on the pump(s)
15:20:16UTC - JeffB turns off the pump(s)
15:25:44UTC - preassure levels off at 41.7PSIG
15:28:31UTC - JeffB turns the pump(s) on, at 41.6PSIG
15:43:15UTC - JeffB turns the pump(s) off
15:54:09UTC - Kyle is here, turns the pumps on, pressure 75.2PSIG
16:02:290UTC - Kyle turns the pumps off, valves out the LVEA, pressure 98PSIG
17:01:12UTC - Kyle turns the pumps back on, valves the LVEA back in, pressure 89PSIG
17:23:57UTC - pressure is at lowest point, 62.9PSIG, and pumps come back on
since then pumps running between 62PSIG and 88PSIG

SQZ:

17:24UTC - H1 range drops
17:46UTC - H1 out of Observe, I take all SQZ guardians (except beatnote) through INIT to DOWN
17:48UTC - SQZ is relocked, no change in range
17:56UTC - SQZ guardians to down, cleared SQZ ASC, would not recommend
18:13UTC - SQZ relocks, after I restore ZM1 and ZM2 pointing, not exactly, but close
18:17UTC - H1 back in Observe
23:44UTC - H1 range goes up, ZM1 yaw changes direction

Comments related to this report

cheryl.vorvick@LIGO.ORG - 08:55, Monday 04 November 2019 (52961)

Link

Images that go with the PT199 timeline:

Images attached to this comment

cheryl.vorvick@LIGO.ORG - 09:02, Monday 04 November 2019 (52962)

Link

An interesting plot showing an alignment change in ZM2 yaw that coincides with the increase in H1 Range.

Images attached to this comment

jeffrey.kissel@LIGO.ORG - 13:21, Monday 04 November 2019 (52971)DetChar

Link

Tagging @DetChar on this one -- these distinct range changes are still a mystery to the on-site team. 
Perhaps comparing BRUCO's (looking for linear coherence) or LASSO's (looking for slow changes that correlate to the times of distinct change) around these times might reveal some smoking guns?
Any help is appreciated!

beverly.berger@LIGO.ORG - 06:41, Tuesday 05 November 2019 (52998)DetChar

Link

The LASSO results for 4 Nov (see https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20191104/detchar/lasso/) show a strong correlation between SQZ channels (perhaps excited by seismic motion) and the range drop. Similar results exist for 1 Nov, the most recent prior day with a long lock crossing the range drop.