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Entry  Fri Dec 20 01:24:11 2013, Den, Update, LSC, high bandwidth loop achieved for yarm CM_OL_meas.pdfcm_ol_sim.pdfCM_slow_fast_cross.pdf
    Reply  Fri Dec 20 03:31:07 2013, Koji, Update, LSC, lock acquisition path for the CM servo 
       Reply  Tue Apr 22 02:14:55 2014, ericq, Update, LSC, lock acquisition path for the CM servo 
    Reply  Fri Dec 20 03:34:40 2013, Koji, Update, LSC, high bandwidth loop achieved for yarm 
       Reply  Fri Dec 20 22:45:02 2013, Koji, Update, LSC, high bandwidth loop achieved for yarm 
Message ID: 9500     Entry time: Fri Dec 20 03:31:07 2013     In reply to: 9499     Reply to this: 9840
Author: Koji 
Type: Update 
Category: LSC 
Subject: lock acquisition path for the CM servo 

up/down scripts are to be made

(Offset Edit on Dec 20 10:38PM)


Configuration:
POY11QMon -> CM Servo In1 -> CM Servo -->Out1 -> ADC -> CM Slow FM -> LSC MC Servo FM -> ETMY(x1.0) -> DAC -> ETMY
                                       |
                                       -->Servo Out -> SR560 (DC, 1st order 30kHz LPF) -> MC In2


Lock acquisition path 1

Initial condition:

CM Slow FM:

  • Gain 2.6

CM Servo setting:

  • In1 Gain 31dB, SW:OFF, Offset -1.880, Boost Off, Super Boost Off, AO +8dB

MC Servo setting:

  • In2 10dB, SW:OFF

Acquisition:

  • Engage LSC
  • LSC MC servo gain +0.1, FM7/FM10 (Trigger FM2 with 3sec delay)
  • Turn on MC

Transition:

  • Enable AO path (CM servo In1 SW:ON, MC servo In2 SW:ON)
  • LSC MC gain +0.1 -> +0.2
  • AO path gain 8dB->14dB
  • LSC MC gain +0.2 -> +0.35
  • AO path gain 14dB->18dB
  • CM servo offset -1.88 -2.7 -> 0.8 0.0 (gradually)
  • Enable CM servo Boost

Lock acquisition path 2

Initial condition:

CM Slow FM:

  • Gain 2.6

CM Servo setting:

  • In1 Gain 31dB, SW:OFF, Offset -1.880, Boost Off, Super Boost Off, AO +20dB

MC Servo setting:

  • In2 10dB, SW:OFF

Acquisition:

  • Engage LSC
  • LSC Yarm G=+0.25 FM4/5 (Trigger FM3/6/7/8)

Transition:

  • Enable MC servo In2 (SW:ON)
  • Set LSC MC gain +0.2 FM7/10
  • Enable LSC MC (On)
  • Enable CM servo In1 (SW:ON)
  • Disable LSC Yarm (OFF)
  • Change CM servo offset -1.88 -> +0.700 -2.70 -> 0.0
  • Enable CM servo Boost
  • Turn on LSC CM FM2 (optional)

Transition to ETMY LSC to MCL

  • After all of the transition: LSC output matrix ETMY (+1.00)
  • LSC output matrix MC2 (-1.00)
  • LSC output matrix ETMY (0.00)
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