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Entry  Wed Oct 8 03:37:44 2014, ericq, Update, LSC, PRFPMI, other sign of CARM offset 
    Reply  Wed Oct 8 03:49:42 2014, Jenne, Update, LSC, PRFPMI, other sign of CARM offset 
Message ID: 10583     Entry time: Wed Oct 8 03:49:42 2014     In reply to: 10582
Author: Jenne 
Type: Update 
Category: LSC 
Subject: PRFPMI, other sign of CARM offset 

Other thoughts from talking with Rana earlier:

  • Is it possible to suppress CARM motion enough that we can use just a digital loop?  Can we do without the AO path?  What would said digital loop have to look like?
  • Q points out that there is a zero in the relative transfer function between CARM to transmission, and CARM to REFLDC.  Is that zero invertible?
  • We should look at some limits, like saturation limits.  How much will we need to actuate?
  • Rana is looking at making a more detailed CARM loop model in simulink to see if we can stay stable throughout our CARM offset reduction journey.

Also, Q and I squished on the suspension connectors earlier tonight.  MC2 was going wonky, which we feared might be because we were in that area working on Chiara earlier.  Then, after squishing the MC connectors, the PRM started misbehaving, so we went and gave all the corner suspension connectors another squish.  No suspension glitching problems since then.

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