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Entry  Mon Jan 31 20:24:45 2011, frank, tara, Notes, BEAT, beat signal down to 12.5 mHz beat_2011_01_30_lowf.png
    Reply  Tue Feb 1 22:22:46 2011, frank, tara, Notes, BEAT, beat signal down to 12.5 mHz PLL_FC_good.png2011_02_01_log3.pngac_highpass.png2011_02_01_dat.matcode_2011_02_01.m
Message ID: 459     Entry time: Mon Jan 31 20:24:45 2011     Reply to this: 463
Author: frank, tara 
Type: Notes 
Category: BEAT 
Subject: beat signal down to 12.5 mHz 

This morning I was able to measure the beat noise down to 12.5 mHz. So I plot it together with the noise budget here.

We also added channel for frequency counter,C3:PSL-FSS_FREQCOUNT which will allows longer data acquisition time for lower frequency.

Then we will be able to see the temperature effect at lower frequency(~ 10 mHz.)

 

Fig1: beat signal at 12.5 mHz to 10 Hz

 

We are also working on PID thermal control for refcav.

Perl script for PID thermal control won't work on Solaris because it doesnt have ezcaread/write command, we will get that from op40m machine at the 40m.

(We can't run Perl script on Linux because it complains that it fails to read / write data from C3:PSL-FSS_HEATER.)

 

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