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Message ID: 6821     Entry time: Fri Jun 15 13:33:39 2012
Author: yuta 
Type: Update 
Category: Green Locking 
Subject: ADC noise contribution to ALS 

ADC noise is not a limiting noise source in a current ALS setup.

Below is the calibrated spectrum of C1:ALS-COARSE_I_ERR when
  Y arm swinging with just damping (red; taken last night)
  terminated before AA (green)
  blocked PSL green beam (blue)

Blue and green curve tells us that noise from the beat PD to ADC is not contributing to the Y arm length sensing noise.

YarmALSnoise20120615.png

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