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Mon Sep 9 20:46:28 2013, Masayuki, Update, LSC, MICH calbration
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Tue Sep 10 17:35:50 2013, Masayuki, Manasa, Update, LSC, MICH calbration    
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Thu Sep 12 23:36:25 2013, Masayuki, Update, LSC, MICH calbration   
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Fri Sep 13 19:22:01 2013, Masayuki, Update, LSC, MICH calbration
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Mon Sep 16 14:11:47 2013, rana, Update, LSC, MICH calbration 
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Tue Sep 17 00:50:42 2013, Masayuki, Update, LSC, MICH calbration
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Message ID: 9128
Entry time: Fri Sep 13 19:22:01 2013
In reply to: 9127
Reply to this: 9131
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Author: |
Masayuki |
Type: |
Update |
Category: |
LSC |
Subject: |
MICH calbration |
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I made sure the yesterday's result was collect. I measured not only the error signal but also the feedback signal. And I compared those signals and measured the TF in order to confirm my servo filter model is not wrong.
The reason of dip at low frequency region is maybe the coherence of the ground motion. The ITMX and ITMY suspensions are put close. If ground motion has coherence, the mirrors move in common mode. That will suppress the free running noise. The attachment is the free running noise of Sep 13rd and Sep 12nd. |
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