40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Wed Jul 2 21:30:42 2014, Jenne, Update, LSC, Little Bo-Peep has lost her phase CARM_loop_ArmPowers1_2July2014.pdf
    Reply  Wed Jul 2 22:58:11 2014, Jenne, Update, LSC, Little Bo-Peep has found her phase 
Message ID: 10125     Entry time: Wed Jul 2 21:30:42 2014     Reply to this: 10126
Author: Jenne 
Type: Update 
Category: LSC 
Subject: Little Bo-Peep has lost her phase 
Little Bo-Peep has lost her phase,
And can't tell where to find it;
Leave it alone, and it'll come home,
Bringing its degrees behind it.
 
Seriously.  What?  I was holding CARM on sqrtTrans with arm powers of about 1, DARM was still ALS diff, PRMI on REFL33.  CARM was actuating on +ETMX+ETMX, since I kept kicking the MC out of lock, but other than that, everything was set by the carm_cm_up script, so I don't think there should be any big differences.  I took a CARM transfer function, and it seems like the phase bubble has all but disappeared compared to the reference from mid-May. 

CARM_loop_ArmPowers1_2July2014.pdf

I need to figure this out before it's worth trying any acrobatic AO path turn-on scenarios.

 

Also this evening, I went to the Yend and did another tweak-up of the green beam alignment. 

ELOG V3.1.3-