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Entry  Thu Oct 24 04:13:15 2013, Jenne, Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 08:04:54 2013, Steve, Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 09:08:27 2013, jamie., Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 14:14:18 2013, rana, Update, LSC, PRMI + 2 ALS arms 
       Reply  Thu Oct 24 15:19:58 2013, Koji, Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 23:25:37 2013, Jenne, Update, LSC, End transmission triggering 
       Reply  Tue Nov 5 16:47:09 2013, Jenne, Update, LSC, End transmission QPDs 
    Reply  Fri Oct 25 04:03:40 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165 
       Reply  Fri Oct 25 21:36:51 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165 
          Reply  Mon Oct 28 14:24:01 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165 
             Reply  Mon Oct 28 18:57:27 2013, Masayuki, HowTo, LSC, read 'scope and spectrum analyser datas 
Message ID: 9279     Entry time: Thu Oct 24 14:14:18 2013     In reply to: 9274     Reply to this: 9280
Author: rana 
Type: Update 
Category: LSC 
Subject: PRMI + 2 ALS arms 

 Just in case people were confused, although the PRMI + 2 ALS arms were controlled, we weren't able to bring them in to resonance. They were in some unknown off-resonant state.

We can try to calculate the expected recycling gain (ignoring losses in the PRM) following section F.2.1 of my Manifesto:

T_PRM = 5.6%, R_ARMS ~ 98%, G_PRC ~38.

So the full TRX/TRY powers should be G_PRC/T_PRM = 690.

In our stable configuration, we were sitting at TRX/Y powers of ~5-10. Once in awhile we could get a state where the power was saturating the detectors at ~50 and possibly would have gone up to 100, but it was all oscillation at that point. (we've got to find and notch the ETM violin mode frequencies in the ALS feedback servos.

As we move in towards resonance, we have to now consider all of complications of handing off to various error signals and CARM optical spring compensation and RF saturation that have been discussed in Rob's thesis and Lisa's lock acquisition modeling.

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