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Entry  Wed Mar 5 11:33:10 2014, Koji, Summary, LSC, 2 arm ALS->LSC transition - road map 
    Reply  Wed Mar 5 19:15:39 2014, Jenne, Summary, LSC, ALS offset moving script modified 
    Reply  Wed Mar 5 22:32:21 2014, manasa, Update, LSC, Stuck at step 2 
       Reply  Thu Mar 6 11:15:32 2014, Koji, Summary, LSC, Stuck at step 2 
    Reply  Fri Mar 7 00:43:34 2014, manasa, Update, LSC, ALS C&D locked (on MC2 and ETMs) and IR resonance obtained ALS_MC2CARM.pdf
Message ID: 9691     Entry time: Wed Mar 5 11:33:10 2014     Reply to this: 9694   9696   9702
Author: Koji 
Type: Summary 
Category: LSC 
Subject: 2 arm ALS->LSC transition - road map 

Step by step description of transition from 2arm ALS to Common/Differential LSC for FPMI

- Step 0: Place the frequencies of the arm green beams at the opposite side of the carrier green.

- Step 1: Activate stablization loops for ALSX and ALSY simultaneously.
  (Use LSC filter modules for the control. This still requires correct handling of the servo and filter module triggers)

- Step 2: Activate stablization loops for ALS Common and Differential by actuating ETMX and ETMY

- Step 2 (advanced): Activate stabilization loops for ALS Common by actuating MC2 and ALS Differential by ETMX and ETMY

- Step 3: Transition from ALS Common to 1/SQRT(TRX)+1/SQRT(TRY). Make sure that the calibration of TRX and TRY are matched.
  The current understanding is that the offset for 1/SQRT(TRX)+1/SQRT(TRY) can't be provided at the servo filter. Figure out
  what is the correct way to give the offsets to the TR signals.

- Step 4: Lock Michelson with AS55Q and then POP55Q (PD not available yet) or any other PD, while the arms are kept off-resonant using ALS.

- Step 5: Reduce the TR offsets. Transition to RF CARM signals obtained from POP55I or REFL11I in the digital land.

- Step 5 (advanced): Same as test6 but involve the analog common mode servo too.

- Step 6: Transition from ALS Differential to AS55Q


Independent test: One arm ALS (To be done everyday)

- ALS resonance scan

- Measurement of out-of-loop displacement (or frequency) stability 

- Check openloop transer function


Independent test: Common Mode servo for one arm

- Reproduce Decmber CM servo result of transition from one arm ALS to CM servo
  Insert 1/sqrt(TRY) servo in between?

- How can we realize smooth transition from ALS to POY11?

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