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Entry  Mon Mar 16 12:26:59 2009, Yoichi, Configuration, IOO, MC1 drift MC1_Drift1.pdf
    Reply  Tue Mar 17 08:44:37 2009, Yoichi, Configuration, IOO, MC1 drift MC1_Drift3.pdf
Message ID: 1406     Entry time: Mon Mar 16 12:26:59 2009     Reply to this: 1408
Author: Yoichi 
Type: Configuration 
Category: IOO 
Subject: MC1 drift 
There seems to be a large drift of MC1 even when there is no WFS feedback.
The attached plot is an example a 20min trend. You can see that MC1 OSEM signals drift significantly larger than that of MC2/MC3.
You can also be sure that there is no drifting voltage applied to the coils on the MC1 during this period.

If no one is working on the IFO today during the LV meeting, I'd like to leave the MC unlocked and see the trend of the MC1 OSEM signals.
Please do not turn on the MC auto locker unless you want to use the IFO.
If you want to do some measurements, please go ahead and lock the MC, but please write it down in the elog.
Thanks.
Attachment 1: MC1_Drift1.pdf  54 kB  | Hide | Hide all
MC1_Drift1.pdf
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