I changed that way that the SQZ_MANAGER SCAN_SQZANG gen state worked to now take a brms_channel argument. Nominally for SCAN_SQZANG_FDS this is SQZ-DCPD_RATIO_3_DB_MON which tunes the squeezing around the 350Hz BLRMS to give the max IFO range. This is not yet tested, changes in SQZ_MANAGER.py svn.

I added a new state SCAN_SQZANG_KHZ (state number 85) from FIS that uses SQZ-DCPD_RATIO_6_DB_MON to maximize sqz at high frequency ~1700Hz. It makes sure ASC is off before scanning angle and can be be used when we take a sqz data set with SRCL offset steps e.g.  83569 to make 83572 brontosaurus plots.

To take SRCL offset FIS dataset (e.g. 83569):

• No SQZ (for subtraction in models)
  • Good time to measure NLG (instructions in 76542) and change NLG if wanted,
  • For SRCL offset measurements, increase NLG (NLG of 52 used in 83569 by increasing sqzparams OPO trans setpoint up to 120uW, SHG waveplate might need adjusting)
• Take IFO to FREQ_INDEP_SQZ
• For each SRCL offset:
  • Turn off SQZ ASC (H1:SQZ-ASC_WFS_SWITCH)
  • Change SRCL offset H1:LSC-SRCL1_OFFSET (prev used 0, -90, -190, -290, -390)
  • Go to SCAN_SQZANG_KHZ, will take 2mins (can check scan data at /ligo/www/www/exports/SQZ/GRD/SQZANG_SCAN/)
  • Go to FREQ_INDEP_SQZ, ASC should turn on as long it's in on in sqzparams, let it converge for ~1minute
  • Take 3 minutes of data, without glitches, note time down.

Take NLG back to nominal ~11, once done.