aLIGO LHO Logbook

H1 General (SUS)

ryan.crouch@LIGO.ORG - posted 16:30, Friday 28 March 2025 (83615)

OPS Friday day shift summary

TITLE: 03/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We lost lock from another earthquake, the wind started picking up during the afternoon but we relocked easily after an alignment. The violins have been damping nicely. The new settings I found for ETMY mode1 are FM1+FM5+FM10 G= -0.1, they damp mode1 well but don't really affect mode6.
LOG:

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
17:19	FAC	Chinook	VPW	N	Heat pump work, started at ~16:30	18:13
17:54	EE	Marc	CER	N	Trace C4 power supply wire	18:16
18:01	ISC	Mayank	Optics lab	LOCAL	ISS array	23:15
18:16	EE	Fil, Marc	CER	N	SUS-C4 power supply swap	18:37
18:17	ISC	Jennie	Optics lab	LOCAL	ISS array	19:23
18:39	FIT	Ibrahim	MidY	N	walk	19:29
18:56	TCS	Camilla	Optics lab	N	Turn on CO2 laser	19:13
19:18	ISC	Betsy	LVEA/CER	N	Grab vacstat bags	19:39
20:17	ISC	Keita	Optics lab	LOCAL	ISS array, PD adjustment	22:15
20:24	PSL	Jason	Optics lab	LOCAL	NPRO tests	22:51
20:42	TCS	Camilla, Matt	Optics lab	LOCAL	TCS CO2 laser work	22:01
21:10	PSL	RyanS	Optics lab	LOCAL	Help Jason with NPRO tests	22:51

15:19 UTC Observing
- I set ETMY mode1's gain to zero in lscparams (SUS)
17:42 UTC lockloss from a 6.6 from Cape Verde
- We did some TOO tasks during this downtime such as
  - Realigning the refcav alog83616
    - IMC to down and misaligned MC3 SUS
  - Swapping a dying SUS power supply in the CER
    - I put all the SUS in HAMs 1 & 2 to safe for this
- 19:25 UTC initial alignment
  - ALS_X (TRX_A_LF_OUT_DQ) would get fuzzy (~6x as thick of a line, 0.1 vs 0.6 min to max) then the WFS error signal would step out, DOF_2_P mainly, then it would come back in
20:40 UTC Observing

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