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Reports until 20:01, Sunday 02 February 2025
H1 SQZ
ryan.short@LIGO.ORG - posted 20:01, Sunday 02 February 2025 (82599)
SHG Temperature Adjusted

At 01:02 UTC, H1 dropped from observing due to the SHG dropping out, and it would not come back on its own. I brought SQZ_MANAGER to 'DOWN' and raised the SHG temperature (H1:SQZ-SHG_TEC_SETTEMP) from 34.6 to 35.2 to raise the OPO ISS control signal and SHG green power back up to around 2.8 and 120mW, respectively. After that, I requested SQZ_MANAGER back to 'FREQ_DEP_SQZ' and everything came back without issue. Once I accepted the new SHG temperature in SDF, H1 returned to observing at 01:13 UTC.

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Displaying report 1-1 of 1.