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Reports until 11:49, Thursday 10 July 2025
H1 SQZ
camilla.compton@LIGO.ORG - posted 11:49, Thursday 10 July 2025 - last comment - 14:40, Thursday 10 July 2025(85669)
Start of a SQZ Data set, checked OPO temp and NLG

Jennie, Elenna, Camilla, Matt

Plan was to take data roughly following 83594 with more mid-sqz data points (adjusting sqz angle to every 50degrees or so looks good).
We lost lock while doing this, maybe  from some compression plate moving ringing up ASC 85670.

DTT saved as camilla.compton/Documents/sqz/templates/dtt/20250710_SQZdata.xml and screenshot attached.

Starting angle at 141deg

Type Time (UTC) Angle DTT Ref Notes
No SQZ 17:21:30 - 17:31:30 N/A ref 0  
FIS Mean SQZ (no ADF) 17:40:00 - 17:43:00 N/A ref 1  
FIS Mid SQZ +50deg 17:49:00 - 17:52:00 (-) 191 ref 2  
FIS Mid SQZ +100deg 17:53:00 - 17:56:00 (-) 241 ref 3 Scatter shelf and Lockloss
 
Checked the NLG before and after adjusting the OPO crystal temp the normal way, using the SEED beam.
OPO Setpoint Amplified Max Amplified Min UnAmp Dark NLG OPO Gain Note
80uW 0.0518   0.007026 -1.35e-5 7.35 -8 Before changing OPO temp, to match Kevins data
80uW 0.083055 0.0023519 0.007026 -1.35e-5 11.8 -8 With changing OPO temp

 Sheila and Matt found that we get different temperature optimizations when optimizing the SEED beam or the RF6 with OPO locked. We tested this out again by checking the NLG again before and after using Sheila's new 85532 SCAN_OPOTEMP OPO GRD state, with a silightly increased range (0.015 rather than 0.01 and 180s rather than 120s), see plot in exports/SQZ/GRD/OPOTEMP_SCAN/. It adjusted temp -0.002deg, the NLG did not change, stayed at ~11.8.

Images attached to this report
Comments related to this report
elenna.capote@LIGO.ORG - 14:40, Thursday 10 July 2025 (85675)

I ran a script that pulls the full 524 kHz OMC DCPD A and B channels during the no squeezing time. The data that was saved was 10 minutes of no squeezing data. I saved the data into .gwf files at the full rate, and another downsampled to 64 kHz.

The data is saved in /ligo/home/elenna.capote/OMC_DCPD/251007-102149_xcorr_data as OMC_DCPD_{A,B}_{524,64}.gwf which can be easily read by gwpy. Unfortunately I can't upload them here because the alog doesn't accept this file format, but I can pass it along to you as necessary if you don't have control room access.

 

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