thomas.shaffer@LIGO.ORG - posted 11:27, Thursday 19 October 2023 - last comment - 13:31, Thursday 19 October 2023(73592)
Lock loss 1813 UTC
We had that same feature in LSC-DARM that we've been seeing recently ~100ms before lockloss.
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There was a small issue with locking the squeezer when we got to low noise. Vicky worked on it and it seems to be a side affect of changing the crystal temperature.
Specifically in SQZ_MANAGER, in the OPO_PZT_OK() checker, I changed the maximum "OK" PZT voltage from 105 to 110 (last number on Line 59). We had been stuck re-locking because OPO resonance was at 106V, and we were failing the OPO_PZT_OK() checker which tries to re-lock to a lower FSR. Instead, we could have also changed the voltage the other OPO PZT, using the CLF_SERVO_SLOW_OUTPUT DC offset, to lower the voltage on PZT1.
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