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Entry  Thu Mar 7 18:12:03 2013, yuta, Update, Alignment, Input beam drift ~ 0.1 mrad/h in pitch IPangulardrift.png
    Reply  Fri Mar 8 20:51:00 2013, Manasa, Update, Alignment, Input beam drift - investigation **IMPORTANT** 
       Reply  Mon Mar 11 12:29:25 2013, Manasa, Update, Alignment, Input beam drift - weekend trend IPANG_drift.png
          Reply  Tue Mar 12 14:02:22 2013, Jenne, Update, Alignment, Beam drift - mystery partially solved? 
Message ID: 8262     Entry time: Fri Mar 8 20:51:00 2013     In reply to: 8252     Reply to this: 8267
Author: Manasa 
Type: Update 
Category: Alignment 
Subject: Input beam drift - investigation **IMPORTANT** 

Checking the drift in input pointing (TT2 is the main suspect)

I have centered IPPOS and the 2/3 part of IPANG that comes out of vacuum to the QPDs to see the drift in input pointing over the weekend or atleast overnight.

If anybody would be working with the IFO alignment over the weekend, do so only after recording the drift in IPANG and IPPOS or if you will be working later tonight, center them ion the QPDs before leaving.

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