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Entry  Fri Mar 1 01:17:06 2013, Jenne, Update, LSC, Xarm oscillation POX11_630Hz_osc.pdf
    Reply  Fri Mar 1 16:58:37 2013, yuta, Update, LSC, Xarm oscillation stopped POX11_630Hz.png
       Reply  Sat Mar 2 00:09:31 2013, rana, Update, LSC, Xarm oscillation stopped 
Message ID: 8203     Entry time: Fri Mar 1 01:17:06 2013     Reply to this: 8208
Author: Jenne 
Type: Update 
Category: LSC 
Subject: Xarm oscillation 

There is an oscillation in the Xarm at 631Hz, which is not in the Yarm.  There is a small peak in POY11_I at this frequency, but only when the Xarm is locked.  If the Xarm unlocks, the peak disappears from POY.  The peak is 3 orders of magnitude larger in POX than in POY, and 4 orders of magnitude larger than the POY noise when this peak is not present.  In the plot, I have turned off the POY whitening, so that its situation is the same as POX (we still need to fix POX whitening switching).  Dark noise (MC unlocked) is the same for both PDs.


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