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Entry  Thu Aug 23 12:17:39 2012, Manasa, Update, , IMC Ringdown mozilla.pdfMC_sus.pdf
    Reply  Thu Aug 23 15:35:33 2012, rana, Update, , IMC Ringdown 
       Reply  Thu Aug 23 17:51:25 2012, Manasa, Update, , IMC Ringdown 
Message ID: 7260     Entry time: Thu Aug 23 17:51:25 2012     In reply to: 7257
Author: Manasa 
Type: Update 
Subject: IMC Ringdown 



 It is HIGHLY unlikely that the IMC mirrors are having any effect on the ringdown. The ringdowns take ~20 usec to happen. The mirrors are 0.25 kg and you can calculate that its very hard to get enough force to move them any appreciable distance in that time.

The huge kick observed in the MC sus sensors seem to last for ~10usec; almost matching the observed ringdown decay time. We should find a way to record the ringdown and the MC sus sensor data simultaneously to know when the mirrors are exactly moving during the measurement process. It could also be that the moving mirrors were responsible for the ripples observed later during the ringdown as well.

* How fast do the WFS respond to the frequency switching (time taken by WFS to turn off)? I think this information will help in narrowing down the many possible explanations to a few.

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