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Entry  Thu Nov 5 02:18:32 2015, gautam, Update, LSC, FSR and linewidth measurements with phase tracker 
    Reply  Fri Nov 6 15:56:00 2015, gautam, Update, LSC, FSR and linewidth measurements with phase tracker Xcalib.pdfYcalib.pdfY_scan_log.pdf2015-11-05_phase_tracker_calib.dat.zip2015-11-04_y_arm_scan.dat.zip
       Reply  Mon Nov 9 11:34:51 2015, yutaro, Update, LSC, FSR and linewidth measurements with phase tracker plt.pngfitresult_and_code.zip
          Reply  Mon Nov 9 14:24:36 2015, yutaro, Update, LSC, FSR and linewidth measurements with phase tracker 
             Reply  Mon Nov 9 15:59:06 2015, ericq, Update, LSC, FSR and linewidth measurements with phase tracker 
                Reply  Mon Nov 9 16:58:59 2015, gautam, Update, LSC, FSR and linewidth measurements with phase tracker Y_scan.pdfmodDepth.pdfMatlab_code.zip
                   Reply  Tue Nov 10 02:34:28 2015, gautam, Update, LSC, Updated interpretation of peaks Y_scan.pdfmodDepth.pdf
                      Reply  Tue Nov 10 11:06:02 2015, yutaro, Update, LSC, Updated interpretation of peaks HOMlocation.pnghomfit.png
                         Reply  Tue Nov 10 11:40:03 2015, Koji, Update, LSC, Updated interpretation of peaks 
                            Reply  Tue Nov 10 16:34:00 2015, yutaro, Update, LSC, Updated interpretation of peaks homfit2.png
                               Reply  Fri Nov 13 17:33:39 2015, gautam, Update, LSC, g-factor measurements findGFactor.zip
                      Reply  Tue Nov 10 11:41:56 2015, Koji, Update, LSC, Updated interpretation of peaks 
       Reply  Fri Nov 13 15:48:16 2015, gautam, Update, LSC, Phase tracker calibration using Rubidium standard 6x
Message ID: 11735     Entry time: Thu Nov 5 02:18:32 2015     Reply to this: 11738
Author: gautam 
Type: Update 
Category: LSC 
Subject: FSR and linewidth measurements with phase tracker 

While the ETMx issues are being investigated - with Eric's help, I took some data from arm scans of the Y arm through ~2FSRs using ALS. I've also collected the data from the frequency counter readout during these scans but since they were done rather fast (over 60seconds), I am not sure how accurate this data will be. The idea however is to use the frequency readout from the phase tracker - this has to be linearized though, which I will do during the daytime tomorrow. The plan is to use our GPS timing unit to synchronize the following chain :

GPS timing unit 1PPS out --> FS725 Rb Clock 1PPS in (I recovered one which was borrowed from the 40m some time ago from the ATF lab yesterday evening, waiting for it to lock to the Rb clock now)

FS725 Rb Clock 10 MHz out --> Fluke 6061A 10MHz reference in

FS725 Rb Clock 10 MHz out-->agilent network analyzer 10MHz reference in (for measurement of the frequency of the signal output from the Fluke RF signal generator independent of its front panel display)

Then I plan to look at the phase tracker output as a function of the driving frequency (which will also be measured, offline, using the digital frequency counter setup) over a range of 20 MHz - 50 MHz in steps of 1 MHz. Results to follow.

Earlier tonight, Eric and I tweaked the PMC alignment (the mode cleaner was not staying locked for more than a couple of minutes, for almost an hour). 

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