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Entry  Tue Jun 5 09:32:12 2012, steve, Update, SUS, PRM oscillation  PRMosc.png
    Reply  Wed Jun 6 09:27:09 2012, steve, Update, SUS, PRM damping restored  PRMwhat.png
       Reply  Thu Jun 7 08:12:20 2012, steve, Update, SUS, PRM is still oscillating PRMoscil.png
          Reply  Thu Jun 7 13:18:42 2012, rana, Update, SUS, PRM is still oscillating 
             Reply  Thu Jun 7 13:25:37 2012, Koji, Update, SUS, PRM is still oscillating 
                Reply  Thu Jun 7 18:46:13 2012, yuta, Update, SUS, PRM oplev centered 
Message ID: 6788     Entry time: Thu Jun 7 18:46:13 2012     In reply to: 6786
Author: yuta 
Type: Update 
Category: SUS 
Subject: PRM oplev centered 

PRM oplev beam was not hitting on the QPD since Jun 1, so I centered it. I reverted the oplev servo gains and now oplev servo looks fine.

C1:SUS-PRM_OLPIT_GAIN = 1.0
C1:SUS-PRM_OLYAW_GAIN = -0.7

There's SIDE to UL/UR/LL/LR coil element in PRM TO_COIL matrix. They were 0 until Mar 31, 2012, but someone changed them to -0.160. I couldn't find elog about it.
Same thing happened to BS on Mar 13, 2012 (see elog #6409), so I think somebody did the same thing to PRM.

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