camilla.compton@LIGO.ORG - posted 12:01, Monday 10 March 2025 - last comment - 08:24, Tuesday 11 March 2025(83270)
SQZ_ANG_ADJUST Servo now back on
Sheila, Mayank, Camilla
The SQZ ang servo has been off since Feb 18th 82891. Today it was turned back on in sqzparams.py and with SQZ_ANG_ADJUST nominal state is now ADJUST_SQZ_ANG_ADF. We expect this to work better than in 82891 as we adjusted H1:SQZ-ADF_VCXO_PLL_PHASE to 25deg so that the AFD H1:SQZ-ADF_OMC_TRANS_SQZ_ANG error signal is in a linear range where our best SQZ is. This should improve the squeezing and keep it more stable.
Range was better last night with the SQZ angle servo keeping the squeezing tuned around 350Hz (yellow BLRMS), plot attached.