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Entry  Wed Feb 4 04:51:14 2015, diego, Update, LSC, CARM Transition to REFL11 using CM_SLOW Path CARM_3Feb2015_CarmBwasCMslow_CarmAwasLiveALS.pdfCARM_3Feb2015_CarmBwasCMslow_CarmAwasLiveALS_Coh.pdfGlitch_in_CARM_and_PRCL_3Feb2015.pngslowCM_04-02-2015_042805.png
    Reply  Thu Feb 5 04:35:14 2015, diego, Update, LSC, CARM Transition to REFL11 using CM_SLOW Path 4Feb2015_Transition_CARM_REFL11_CM_SLOW_AP_18.png
       Reply  Fri Feb 6 03:21:17 2015, diego, Update, LSC, CARM Transition to REFL11 using CM_SLOW Path 
Message ID: 10982     Entry time: Fri Feb 6 03:21:17 2015     In reply to: 10979
Author: diego 
Type: Update 
Category: LSC 
Subject: CARM Transition to REFL11 using CM_SLOW Path 

[Diego, Jenne]

We kept struggling with the PRMI, although it was a little better than yesterday:

  • we retuned the X Green beatnote;
  • we managed to reach lower CARM offsets than yesterday night, but we still can't keep lock long enough to perform a smooth transition to CM SLOW/REFL11;
  • we tweaked MICH a bit:
    • the ELP in FM8 now is always on, because it seems to help;
    • we tried using a new FM1 1,1:0,0 instead of FM2 1:0 because we felt we needed a little more gain at low frequencies, but unfortunately this didn't change much MICH's behaviour;
    • now, after catching PRMI lock, the MICH limiter is raised to 30k (in the script), as a possible solution for the railing problem; the down/relock scripts take care of resetting it to 10k while not locked/locking;

So, still no exciting news, but PRMI lock seems to be improving a little.

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