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Message ID: 4042     Entry time: Fri Dec 10 11:51:20 2010
Author: Osamu 
Type: Update 
Category: SUS 
Subject: ITM seems bad 

20101209_ITMX_drift.png

This graph shows 5 hours data in minute trend for ITMX and ETMX from 5am to 10 am today. ITM pitch drift is 3 times lager than ETM pitch if the OSEM sensitivity is assumed to be the same.

 

20101209_ITMX_2stages.png

This graph is last 1 hour data of above graph in second trend.

It is clealy seen that ITM yaw is jumping between two stages. I guess ITM is something wrong, touching magnets or earthquake stops?

Needs inspection.

 

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