aLIGO LHO Logbook

LHO General

thomas.shaffer@LIGO.ORG - posted 16:33, Wednesday 02 September 2026 (91786)

Ops Day Shift Start

TITLE: 09/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY:

ALS Y arm was locked on arrival, but there was no light in X. Keita, Louis, and I tried trending the ITMX, ETMX, and TMSX as well as relavent oplevs to figure out where the light went and ultimately decided to runa another baffle alignment. Ran a TMS, ITM, ETM baffle alignment, but the ETM alignment script could not find the PDs. Keita found the PDs by hand using the oplevs to help with reference assuming sticking in the OSEMs. This brought a tiny amount of light back to ALSX which Keita then maximized.
Next check was to look for clipping in the POP path before the gate valve closes.
Gate valve 20 closed at 2056UTC
Louis and Jenne worked on doing a Y arm input alignment.

LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:07	FAC	Kim	Opt Lab	n	Tech clean	15:30
16:31	-	Tyler, Dolly, +1	LVEA	n	Tour	17:31
17:04	FAC	Kim	EX	n	Clean in prep for vent	19:00
17:47	SPI	Marc, Jennie	LVEA	n	Taking picture of SUS R2 rack	17:58
18:18	ISC	Sheila, Louis	LVEA	Local	ISCT1 table alignment	18:59
20:18	VAC	Gerardo, Jordan	EX	n	Closing GV20 and setting up TMDS	00:18
20:34	FAC	Chris	EX	n	Top of chamber cleaning	21:29
20:35	SPI	Jennie	LVEA	n	SUS R2 rack SPI	22:00
20:38	PSL	Jason	Opt Lab	n	Checking on EOM for next week	20:54
20:46	TCS	Camilla, Jackie	Prep Lab	YES	CHETA lab laser work	23:26
21:04	-	Tony	LVEA rec.	n	Comm system organization	21:08
21:41	SUS	Daniel, Rahul	EX	n	TMDS setup	22:23
23:18	SPI	Jennie	LVEA	n	SPI electronics rack work	00:28