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Reports until 15:12, Thursday 30 October 2025
H1 PSL (OpsInfo)
jason.oberling@LIGO.ORG - posted 15:12, Thursday 30 October 2025 (87866)
PSL Recovered After Interlock Trip

The PSL is now back online after the interlock trip.  During recovery I did a quick beam alignment into the PMC, as PMC Refl came back at ~26.5W, 1.2W higher than before the interlock trip.  After the alignment I was able to get PMC Refl down to ~25.4W.  I then changed the pump diode current for power supply 3 (Amp2, pump diodes 1 and 2), to 9.4A from 9.3A.  This made no change to Amp2 Out but brought PMC Trans back to ~106.2W and PMC Refl back to ~25.2W.  The FSS and ISS engaged without issue.  I had to change the ISS RefSignal to -2.02V from -1.99V to get the % diffracted power back to ~4.0; with the ISS engaged PMC Trans is now ~106.0W.  The % diffracted power will likely slowly change as things reach thermal equilibrium, as it usually does, so I'll monitor this over the weekend.

The watchdogs are back on and the PSL is good to go.

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