victoriaa.xu@LIGO.ORG - posted 20:17, Friday 09 December 2022 - last comment - 22:57, Monday 12 December 2022(66260)
SQZT0 CLF power increased, swapped mirror back to 5:95 before SQZT0 fiber coupler
On SQZT0, yesterday ~12:30pm I swapped the CLF path's M5 optic back its original 5:95 BS, reverting the change from earlier LHO:63893 where we added power here to compensate our broken clf fiber.
Screenshot shows that cutting power with this 5:95 brings CLF_RF6 down by -8 according to the CLF_REFL_RF6_DEMOD_RFMON, so CLF_RF6 is now around -20 with the CLF AOM driving at +20dBm, seems fine. We have previously been operating with CLF_RF6=-25 at higher NLGs, so this -20 at low NLG should be fine.
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Today the calibration for CLF launched power (H1:SQZ-CLF_LAUNCH_DC_POWERMON) was updated accordingly and saved to SDF. I adjusted the splitting/pick-off power ratio to match Thorlabs power meter readings around the pickoff.