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Message ID: 803     Entry time: Wed Aug 6 13:15:57 2008
Author: Yoichi 
Type: Update 
Category: SUS 
Subject: SRM ETMX freeswing spectra 
After yesterday's work on the SRM, I took free swinging spectra of SRM.
The eigen modes look ok. But there are many other peaks which were not present in vacuum.
Some of those peaks may be resonances of the air inside the chambers and the pipes.
However, the peaks around 0.2Hz are too low frequency for those air compression modes.
I took the ETMX spectra at roughly the same time. I chose ETMX because we have not touched it after the vent.
ETMX also shows some extra peaks but the frequencies are different.
Attachment 1: SRM-ETMX-freeswing.pdf  340 kB  | Show | Show all
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