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Message ID: 9920     Entry time: Wed May 7 04:01:44 2014
Author: rana, jenne 
Type: Update 
Category: LSC 
Subject: PRFPMI: Common Mode servo using REFL_DC ON, CARM offset still non-zero 
  1. With REFL_DC coupled into the CM board through an SR560 (with an offset subtractor), we were able to transition to use it as the CARM error signal.
  2. We reduced the CARM offset until the arm powers went up to ~13.
  3. We had the AO path turned on and the MCL/AO crossover was ~150 Hz.
  4. We saw the double cavity pole come in from HF down to ~1-2 kHz. The lock stayed stable like this.
  5. We've set the IMC overall gain higher by +4dB in the mcup script. That's -4 dB from Eric's max gain earlier today.
  6. We have some scripts now for this scripts/PRFPMI/ :   camr_cm_down.sh and carm_cm_up.sh
  7. The sequence was ALS -> SqrtInv while digital with CARM -> MC2. Then we digital transition to REFL_DC using the CM board switch to put REFL_DC into the REFL11_I socket.
  8. REFL_DC is noisy, so we upped the SR560 gain by 10 and compensated.

Also, we found the PRM OL off and turned it back on. The ETMY was swinging a lot after lock loss, so we set its SUSPOS damping gain to match the ETMX and it stopped swinging so much.

Next up: more of the same, make this sequence more stable, turn on CARM OSC and watch the LOCKI outputs while we slowly ramp between signals.

Also, what should be the sign of the CARM offset ???

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