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Entry  Tue Mar 27 17:38:03 2012, Jenne, Update, IOO, Another possibility / thought 
    Reply  Tue Mar 27 17:52:08 2012, Koji, Update, IOO, Another possibility / thought 
Message ID: 6455     Entry time: Tue Mar 27 17:52:08 2012     In reply to: 6454
Author: Koji 
Type: Update 
Category: IOO 
Subject: Another possibility / thought 

It is quite likely that we touched the Faraday in Nov 2010.

In this entry http://nodus.ligo.caltech.edu:8080/40m/3874 I wrote that I removed the MCT optics in the chamber.
This is the pickoff between the IMC and the Faraday. This causes the beam shift. Therefore, the Faraday had
to be moved.

There were intensive in-chamber activities from Nov to Dec 2010. I am sure that almost everytime we went into
the chamber, we checked the spot position on the MMT mirrors as well as the TT and PZT mirrors.

Does the miscentering of the spots on the MMT mirrors cause the mode matching significantly changed?

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