Over the weekend the ifo range has been slowly degrading due to loss of squeezing, as noted in both Ryan and Ibrahim's shift alogs.
The attached trend shows the range drfiting with the sqz blrms 3 (centered at 350 Hz). We could implement servos for the squeezing angle demod phase using the ADF (error signal for this servo shown in purple), or for the OPO temperature, or both.
I stepped the sqz angle demod phase to look at the ADF error signal, using z step -s 30 H1:SQZ-CLF_REFL_RF6_PHASE_DELAYSTEP +111,24 (second attachment) I then adjusted H1:SQZ-ADF_VCXO_PLL_PHASE to get a zero crossing near where the squeezer blrms were low and repeated a smaller demod angle scan, which had the error signal crossing 0 at good squeezing. I edited the guardian to ask it to turn this servo back on, (and changed the setpoint and nominal state). The servo was osciallting a bit so I reduced the gain from -0.5 to -0.2. Then servo went in the wrong directon, and we lost lock.
After relocking the servo worked well, in the early part of the lock when the SQZ ASC is off.
LLO has done some work on automating the temperature adjustment:
