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Reports until 12:53, Tuesday 23 December 2025
H1 PSL
ryan.short@LIGO.ORG - posted 12:53, Tuesday 23 December 2025 (88651)
PSL PMC and RefCav Remote Alignment Tweak

The PSL PMC and RefCav have been slightly misaligned since the power outage, so today I took a bit of time to touch these up before the holiday break.

With the ISS off, I was able to only improve the PMC a bit, bringing PMC TRANS from 105.7W to 106.3W and PMC REFL from 25.5W to 25.2W. I then re-engaged the ISS and slightly adjusted the RefSignal to bring the diffracted power back to around 4%. Moving onto the RefCav, here I got somewhat better improvements, bringing the TPD signal up from 519mV to 530mV.

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