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Reports until 05:44, Friday 02 June 2023
H1 General
anthony.sanchez@LIGO.ORG - posted 05:44, Friday 02 June 2023 - last comment - 10:51, Friday 02 June 2023(70083)
Friday Owl Mid Shift report.

IFO STATUS: UNLOCKED
Sudden Lockloss for an Unknown reason 34 minutes into lock: 
https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1369731497

Tried to relock right after the lockloss and has a lockloss at LOCKING ALS

I'm having troubles getting through Align_IFO's INPUT_ALIGN_OFFLOADED because the IMC is losing lock during the process.
I'm now going to try pausing both INIT_ALIGN and ALIGN_IFO until the IMC is locked again.
Seems like the IMC is taking a while to get Locked.
Started troubleshooting Init_Align: 
https://cdswiki.ligo-wa.caltech.edu/wiki/Troubleshooting%20the%20IFO#Initial_Alignment_Troubleshooting

Got to the diagnosing IMC Locking Issues.
https://cdswiki.ligo-wa.caltech.edu/wiki/Diagnosing%20IMC%20locking%20issues

DiagMain has a message PSL_ISS: Diffracted power is high.
Searched for an Alog about this message.
Trending these channels: I noticed that these signals 
H1:PSL-ISS_DIFFRACTION_MIN H1:PSL-ISS_DIFFRACTION_AVG H1:PSL-ISS_DIFFRACTION_MAX

Using alog 58264 as a reference I followed the instructions for adjusting the diffraction power.
 H1:PSL-ISS_REFSIGNAL current value: -1.99 -> back to -1.99
 H1:PSL-ISSSECONDLOOP_AC_COUPLING_OFFSET Current Value 0.050 -> back to 0.050

command for the ndscopes I was using to determine if my changes are actually doing anything at all:
ndscope H1:PSL-ISS_SECONDLOOP_AC_COUPLING_OFFSET H1:PSL-ISS_DIFFRACTION_AVG  H1:PSL-ISS_SECONDLOOP_ENABLE_MON H1:PSL-ISS_REFSIGNAL H1:IMC-PWR_IN_OUT16 -k
It seems like no matter what I do with the REFSIGNAL there is not a responce on the Diffaction AVG even if I change the AC Coupling Offset. 
 
 H1:PSL-ISS_SECONDLOOP_CLOSED and Cylced this on and off. 

IMC can lock when ISC goes into Prep for locking. But still has a PSL-ISS: Diffraction Power too High error message. And IMC is still unlocking during Initial Alignment.


 

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Comments related to this report
jeffrey.kissel@LIGO.ORG - 10:51, Friday 02 June 2023 (70091)
Source of the issues was a failure of an anti-aliasing filter electronics for the PSL ISS. See FRS:28134 and LHO:70089.
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