40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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Entry  Thu Jul 19 04:44:09 2018, Annalisa, Terra, Summary, Thermal Compensation, frequency shift observed with heating! scanning_fine_2018-07-19-07-32-08_parsed.pdfscanning_fine_2018-07-19-06-57-47_parsed.pdfYscan_scanning_parsed_2am.txt.pdf
    Reply  Fri Jul 20 07:43:54 2018, Steve, Summary, SUS, ETMY  ETMY_leveling.pngETMY.png
    Reply  Sat Jul 21 01:06:49 2018, gautam, Summary, Thermal Compensation, Y arm locking 
       Reply  Sat Jul 21 14:03:19 2018, Koji, Summary, Thermal Compensation, Y arm locking 
Message ID: 14096     Entry time: Sat Jul 21 14:03:19 2018     In reply to: 14094
Author: Koji 
Type: Summary 
Category: Thermal Compensation 
Subject: Y arm locking 

Ah. With MC2 feedback, we have about 3 times smaller "optical gain" for the ASS A2L. We have same dither, same actuator, but we need only 1/3 actuation of the MC2 compared to the ETMY case.
We had to reduce the ASS spot servo from 1 to 0.3 to make is stable, so this means that the ASS is really merginally stable.

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