camilla.compton@LIGO.ORG - posted 15:58, Wednesday 20 December 2023 - last comment - 16:40, Wednesday 20 December 2023(74948)
SQZ angle servo point adjusted, more
Naoki, Sheila, Camilla
After our SQZ data taking 74935, we adjusted H1:SQZ-ADF_OMC_TRANS_PHASE from 80 to 78 to have the SQZ_ANGLE_ADJUST servo keep the sqz angle slightly lower, to sacrifice some high frequency squeezing for more squeezing in the DARM bucket. We can already see this has improved the image (135Hz) BLRMS, plot attached. Yellow 350Hz BLRMs is the same. Plot attached.
Note that the SQZ_ANGLE_ADJUST servo wasn't on in the two previous locks 74918 so that may slightly effect SQZ angle.
Images attached to this report
Comments related to this report
Oli dropped us out of observing so Naoki and I could revert this change at 00:35UTC. The SQZ angle had changed 15degrees (normally ~5deg) to 185 and the SQZ BRLMS had got worse, see attached.
Images attached to this comment
