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Entry  Wed Dec 15 11:26:39 2010, frank, tara, Notes, BEAT, cleaning optics to get rid of scattering light clean_2010_12_15.jpgbeat_2010_12_15.png
    Reply  Fri Dec 17 02:23:38 2010, frank, tara, Notes, BEAT, cleaning optics to get rid of scattering light clean_2010_12_16.jpgbeat_2010_12_16.png
Message ID: 433     Entry time: Fri Dec 17 02:23:38 2010     In reply to: 431
Author: frank, tara 
Type: Notes 
Category: BEAT 
Subject: cleaning optics to get rid of scattering light 

I'm continuing with cleaning optics. The optics in cyan circles in the attached picture are cleaned today.

One of the RFPD (currently, for RCAV), has no protecting glass, and it is very dirty. I used an air can to blow some dust away.

 Most of the improvement in the noise spectrum comes from the cleaning of the RFPD, and it is still dirty.

I notice that there is a peak at 60 Hz coming up in the measurement, there was none before. I have to look into this

and make sure that no electronic noise is coming up.

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