aLIGO LHO Logbook

LHO General

thomas.shaffer@LIGO.ORG - posted 16:06, Thursday 31 August 2023 (72590)

Ops Eve Shift Summary

TITLE: 08/31 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: One lock loss during the shift that ended a 27 hour lock. Relocking was straight forward but I had to very slightly move ETMY to get ALSY to lock. This was the only locking intervention (outside of a small test). We've now been locked for 1 hour and observing for 45min.
LOG:

1830 Out of Observing for commissioning
2009 Observing
2053 Lock loss (1377550449)
Relock
- I had to move ETMY 0.3 urad in Yaw to get ALS to lock
- Moved the H1:ALS-C_COMM_VCO_CONTROLS_SETFREQUENCYOFFSET from -1000 to -1500 during DRMI acquisition. It caught quickly after I made the change, and it didn't seem to have any other issues bringing it back to -200 in PREP_TR_CARM. Might make this the new norm. Sheila had mentioned that this works when we have high arm transmission flashes but it won't catch, but maybe we could just run with it all the time. Definitely worth another test on Tuesday.
2224 Observing

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:13	FAC	Randy	MY	n	Inventory	18:47
15:51	FAC	Ken	OSB receiving	n	Replacing lights	22:07
17:30	FAC	Tyler	EY	n	Chiller line work on top of air handler roon	18:07
17:32	CC/SEI	Mitch	EY, EX	n	FAMIS checks in end station mech rooms	18:17
18:41	SQZ	Sheila, Vicky	LVEA - SQZ bay	Local	SQZ table alignment	19:51
18:41	CAL	Jeff, Louis	CR	n	CAL measurement	19:57
19:03	SEI	Jim	Office	n	HAM1 filter tests	19:58
20:00	FAC	Tyler	EY	n	More HVAC work on AUR	20:31
21:22	SEI	Jim	Office	n	HAM7 new filters	21:40