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Entry  Thu May 29 02:16:02 2014, ericq, Update, LSC, High Bandwidth power recycled Yarm.  quickOLTFs.pdf
    Reply  Thu May 29 14:40:17 2014, Koji, Update, LSC, High Bandwidth power recycled Yarm.  
       Reply  Thu May 29 15:33:55 2014, ericq, Update, LSC, High Bandwidth power recycled Yarm.  
Message ID: 10002     Entry time: Thu May 29 02:16:02 2014     Reply to this: 10004
Author: ericq 
Type: Update 
Category: LSC 
Subject: High Bandwidth power recycled Yarm.  

I'll put more detail in the morning, but I was able to get the PRM/ITMY/ETMY coupled cavities locked with 32kHz bandwidth using the AO path. (However, this is a pretty low-finesse situation, since the BS is dumping so much power out of the PRC. Full buildup is only 3 or 4 times the single arm power)

Since our ALS is better than it was a month ago when I last played with this, I was able to hop straight from ALS to REFL11 I on resonance, with the PRY locked on 3f.

Here are some quick OLTF plots I took along the way.

 

 

quickOLTFs.pdf

I'm using this configuration to validate my loop modelling for the full double arm case. Right off the bat, this tells me that the "minus" polarity on the CM servo is the correct one. I didn't use REFLDC at all tonight, but I figure I can check it out by doing the transition backwards, so to speak.

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