aLIGO LHO Logbook

LHO General

thomas.shaffer@LIGO.ORG - posted 13:49, Tuesday 22 September 2026 (91911)

Ops Day Shift End

TITLE: 09/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Maintenance day wrapped up without much of a fuss. EX ans CS gate valves are still closed making this afternoon's locking unusual. I just finished a modified initial alignment described below.

Once maintenance concluded I ran a very modified initial alignment:
- PRX locked and touched up PRM by hand
- MICH dark, touching up the BS to reduce the camera spot and AS_A as best I could. This proves hard once you get close because the beam seems to bounce around and the remnants of the spot on the camera can be tough to say which is better or worse.
- SR2 align ran great.
- SRY wouldn't lock until I increased AS_A flashes by adjusting SRM. Then I increased AS_A with SRM and a touch of SR2.

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
14:52	VAC	Norco	CP2 (CS)	n	LN2 fill	16:52
14:57	FAC	Kim	EX	n	Tech clean	16:04
15:09	VAC	Jordan	LVEA	n	Prep for leak checking	15:31
15:37	PCAL	Tony, Caroline	PCAL lab	y	Prep for end station meas	15:47
15:37	CDS	Erik	Office	n	h1calcs restart and DAQ restart	16:09
15:50	PCAL	Tony, Caroline	EX	YES	PCAL meas	18:23
16:04	FAC	Kim	EY	n	Tech clean	17:46
16:25	PSL/JAC	Jason	PSL encl.	LOCAL	Check JAC PD alignment	17:17
16:39	FAC	Chirs, Randy	EY,CS,EY	n	Shuttling snorkel lift to EY	17:02
16:47	CDS	Fil	LVEA	n	Install 24V power cables from LY vac rack to BSC8	18:03
16:55	VAC	Jordan	LVEA	n	Check on leak detector background	17:03
17:02	FAC	Randy	Yarm	n	Beam tube enclosure hole repair	21:48
17:18	VAC	Travis, Jordan, Gerardo	LVEA	n	Leak checking beam tube	18:41
17:23	FAC	Chris	Outbuildings	n	FAMIS and safety checks	19:08
17:41	OPS	Richard	LVEA	n	Checking on teams	17:59
17:46	FAC	Kim	LVEA	n	Tech clean	18:48
18:00	PEM	Robert	LVEA	n	Check on PEM sensors	21:13
18:03	CDS	Fil	LVEA	n	BNC cable removal in bier garten	18:45
18:20	VAC	Norco	MX	n	LN2 fill	20:20
18:25	SUS	Ryan C	CR/EX/EY	n	SUS charge measurements	21:28
18:28	PCAL	Tony, Caroline	PCAL lab	y	Post end station measurement	18:49
18:29	SUS	Oli	LVEA	n	Flipping switch on BS sat amp box	18:34