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Reports until 09:24, Thursday 17 October 2024
H1 SQZ
camilla.compton@LIGO.ORG - posted 09:24, Thursday 17 October 2024 (80724)
OPO temp needs adjusting after OPO PZT change and SQZ_ASC can realign after PSAMS change.

Vicky, Camilla

Two things to note form this morning's commissioning time before we cause a lockloss while we turned off the new PSAMS filter limit, sorry :( 

  1. When the OPO locks with a different PZT voltage (did before commissioning time started and we lost 1bD of SQZ and 3MPc range), the temperature needs to be adjusted to re-optimize squeezing, alignment via ASC isn;t enough to bring back good squeezing, see attached plot. First t-cursor is OPO PZT re-lock, seconds t-cursors is OPO temperature change. We also ran SQZ_SQZ_ANG but that didn't make much of a difference.
  2. SQZ ASC worked well to bring back alignment after PSAMS changes, see plot, we reverted the PSAMs changes as didn't see SQZ get better/worse with ther different values tried.
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