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ID Date Authorup Type Category Subject Text Attachments
  8952   Thu Aug 1 15:28:44 2013 gautamUpdateCDSNew model for endtable PZTs-problem solved

    

       
            
  
  8956   Thu Aug 1 20:58:56 2013 gautamUpdateCDSNew model for endtable PZTs-MEDM Screens setup 
I
 MAIN_SCREEN.pdfMATRICES.pdfLOCKINS.pdfCONTROL_FILTERS.pdf 
  8957   Thu Aug 1 21:28:09 2013 gautamUpdateCDSSlow channels set-up in ALS The following
slow channels have been added and are now
  
  8966   Mon Aug 5 18:18:32 2013 gautamUpdateCDSChoosing LO Amplitudes and Frequencies In
order to decide what frequencies to dither
the 4 degrees of freedom (M1-pitch&yaw,
 GTR_Power_Spectrum.pdf 
  8967   Mon Aug 5 18:48:44 2013 gautamConfigurationendtable upgradeFull range calibration of PZT mounted mirrors for Y-endtable I
had prepared two more PZT mounted mirrors
for the Y-end some time back. These are:
 2-inch-CVI-Yawcalib.pdf2-inch-CVI-Pitchcalib.pdf1-inch-Laseroptik-Yawcalib.pdf1-inch-Laseroptik-Pitchcalib.pdf 
  8972   Tue Aug 6 16:36:51 2013 gautamUpdateCDSChoosing LO Amplitudes and Frequencies-revisedI redid
the power spectrum measurement for the X-arm
green transmission after aligning the arm
 powerSpec0806.pdf 
  8983   Wed Aug 7 23:40:49 2013 gautamUpdateCDSX-End Green ASS - A first update I
have done some preliminary testing of the
X-End Green ASS Servo. I will write a more
 time-series.pdf 
  8993   Sat Aug 10 05:53:51 2013 gautamUpdateCDSX-End Green ASS - RoundupOver
the last three days, I've had the interferometer
to test and optimize the ASX Servo. Based
 New_ASX_MEDM_MAIN.pdf 
  11603   Tue Sep 15 20:44:13 2015 gautamSummaryLSCChecking the delay line phase shifter DS050339I checked out the delay line phase shifter
[URL=https://dcc.ligo.org/public/0016/D050339/000/D050339-A.pdf]D050339[/URL],
([URL=https://dcc.ligo.org/public/0001/T050250/001/T050250-v1.pdf]theory
 IMG_20150915_193100.jpgCalibration.pdf 
  11613   Thu Sep 17 17:27:01 2015 gautamUpdateLSCRF micky mouse - dodgy DIN connector blocks fixed[Steve, gautam]

We fixed the problematic DIN connectors
on 1Y2, by swapping out the 3 DIN connector
 DIN_rail_terminal.jpg 
  11615   Thu Sep 17 19:58:06 2015 gautamSummaryComputer Scripts / ProgramsFrequency counting algorithmI made some changes to the c1tst model
running on c1iscey in order to test my algorithm
for frequency counting. I followed the steps
  
  11628   Mon Sep 21 18:31:06 2015 gautamSummaryComputer Scripts / ProgramsFrequency counting algorithmI have been
working on setting up a frequency counting
module that can give us a readout of the
 6x 
  11647   Tue Sep 29 03:14:04 2015 gautamUpdateCDSFrequency divider boxEarlier today, the front panels for the
1U chassis I obtained to house the Wenzel
dividers + RF amplifiers arrived, which meant
 IMG_0014.JPGIMG_0015.JPG 
  11650   Tue Sep 29 19:38:09 2015 gautamUpdateGeneralFOL fiber box revampThe new 2x2 fiber couplers arrived today
so Eric gave me an overview on the changes
to be made to the existing configuration
 IMG_0017.JPGFOL_schematic.pdfIMG_0018.JPGIMG_0016.JPG 
  11652   Wed Sep 30 13:07:13 2015 gautamUpdateGeneralFOL fiber box revampEric pointed out that the 1x2 couplers
that were used in the previous arrangement
and which I recycled, were in fact NOT
 FOL_schematic.pdf 
  11670   Tue Oct 6 16:56:40 2015 gautamUpdateGeneralFOL fiber box revamp[gautam, ericq]

We had a look at the IR beat (PSL+Xarm)
today using the new FOL fiber box, and compared
 20151006_Xbeat_psd.pdf20151006_Xbeat_coherence.pdf 
  11683   Fri Oct 9 19:54:58 2015 gautamUpdateCDSFrequency divider box - installation in 1X2 rackThe new ZKL-1R5 RF amplifier that Steve
ordered arrived yesterday. I installed this
in the frequency divider box and did a quick
 IMG_0027.JPGtime_seris_25MHz.pdf 
  11684   Mon Oct 12 17:04:02 2015 gautamUpdateCDSFrequency divider box - further testsI carried out some more tests on the digital
frequency counting system today, mainly to
see if the actual performance mirrors the
 calibration.pdfsystematics.pdf 
  11690   Wed Oct 14 17:40:50 2015 gautamUpdateCDSFrequency divider box - further testsSummary:

I carried out some further diagnostics
and found some ways in which I could optimize
 time_series_input_signals.pdfcalibration_20151012.pdfsystematics_20151012.pdf 
  11697   Mon Oct 19 11:20:34 2015 gautamUpdateVACRGA scan resetSteve pointed out that in the aftermath
of the Nitrogen running out a couple of times
last week, the RGA had shut itself off thinking
 RGAscan_151019.png 
  11704   Tue Oct 20 17:36:01 2015 gautamUpdateCDSFrequency counting with moving averageI'm working on setting up a moving-average
in the custom C code block that counts the
zero crossings to see if this approach is
  
  11709   Fri Oct 23 18:36:48 2015 gautamUpdateCDSFrequency counting - workable setup preparedI've
made quite a few changes in the software
as well as the hardware of the digital frequency
 Yscan.pdf 
  11712   Sat Oct 24 12:34:43 2015 gautamUpdateCDSFrequency counting - workable setup preparedSorry for the confusion - I did mean Green
beat frequency, and I had neglected the
factor of 2 in my earlier calculations. However,
 Yscan.pdfFrequency_readout.pdf 
  11714   Mon Oct 26 18:59:25 2015 gautamUpdateLSCGreen beatnote couplers installedI found
(an old) 10 dB coupler in the RF component
shelves near MC2 - it has BNC connectors
  
  11715   Mon Oct 26 19:10:59 2015 gautamUpdateGreen LockingAUX PDH loop characterizationI began my attempts to characterize the
PDH loops at the X end today. My goal was
to make the following measurements:
  
  11723   Fri Oct 30 16:56:04 2015 gautamUpdateCDSis there a problem with the SCHMITTTRIGGER CDS library part?Over the course of my investigations into
the systematic errors in the frequency readout
using digital frequency counting, I noticed
 3000Hz.pdf4628Hz.pdf3000Hz_software_SCHMITT.pdf4628Hz_software_SCHMITT.pdf 
  11727   Tue Nov 3 18:49:41 2015 gautamUpdateSUSETMX kicked upI was trying to take a few more IR transmission
scans with ALS when the ETMX got kicked again.
I'm not sure how to fix this, so for
  
  11735   Thu Nov 5 02:18:32 2015 gautamUpdateLSCFSR and linewidth measurements with phase trackerWhile the ETMx issues are being investigated
- with Eric's help, I took some
data from arm scans of the Y arm through
  
  11736   Thu Nov 5 03:04:13 2015 gautamUpdateCDSFrequency counting - systematics and further changesI've
made a few more changes to the frequency
counting code - these are mostly details
 Systematic_error.pdfsystematics_origin.pdf 
  11738   Fri Nov 6 15:56:00 2015 gautamUpdateLSCFSR and linewidth measurements with phase trackerSummary:

I performed a preliminary calibration
of the X and Y phase trackers, and found
 Xcalib.pdfYcalib.pdfY_scan_log.pdf2015-11-05_phase_tracker_calib.dat.zip2015-11-04_y_arm_scan.dat.zip 
  11743   Mon Nov 9 16:58:59 2015 gautamUpdateLSCFSR and linewidth measurements with phase tracker


 Y_scan.pdfmodDepth.pdfMatlab_code.zip 
  11745   Tue Nov 10 02:34:28 2015 gautamUpdateLSCUpdated interpretation of peaksAfter thinking about the interpretation
of the various peaks seen in the scan through
2 FSRs, I have revised the information presented
 Y_scan.pdfmodDepth.pdf 
  11750   Tue Nov 10 19:25:42 2015 gautamUpdateGeneralFS725 Rubidium referenceIn the last few days, with Koji's help,
I have recovered both the FS725 Rubidium
references from W. Bridge, one from
  
  11751   Wed Nov 11 11:41:42 2015 gautamUpdateGeneralLong cable laid out for 1pps signalIn order to synchronise the FS725 Rb clock
with our GPS timing signals, I laid out a
longish cable running from 1X7 to the
  
  11761   Fri Nov 13 15:48:16 2015 gautamUpdateLSCPhase tracker calibration using Rubidium standard[yutaro, gautam]




 6x 
  11762   Fri Nov 13 17:33:39 2015 gautamUpdateLSCg-factor measurements


 findGFactor.zip 
  11767   Mon Nov 16 16:18:34 2015 gautamUpdateGeneralwater leak along Y-arm?A Caltech maintenance staff dropped by
at around noon today, and told me that he
had seen a small puddle of water on the other
  
  11809   Wed Nov 25 14:46:53 2015 gautamUpdateCDSc1lsc models restartedI noticed that all the models running
on C1LSC had crashed when I came in earlier
today. I restarted all of them by ssh-ing
  
  11833   Tue Dec 1 17:16:31 2015 gautamUpdateCDSScript for copying BLRMS filtersWe've been talking about putting in
BLRMS filters for several channels - it would
be a pain to manually copy over the correct
 makeFilterFiles.bash.zip 
  11840   Wed Dec 2 18:54:20 2015 gautamUpdateCDSChanges to C1MCS, C1PEM Summary:

I've
made several changes to the C1MCS model and
  
  11841   Thu Dec 3 03:01:07 2015 gautamUpdateLSCCalibration of C1CAL [ericq, gautam]

While trying to resolve the strange
SRCL loop shape seen yesterday (which has
 2015-12-C1CAL_Calibration.pdf 
  11844   Thu Dec 3 18:18:48 2015 gautamUpdateCDSBLRMS for optics suspensions - library blockIn order to be consistent with the naming
conventions for the new BLRMS filters, I
made a library block that takes all the input
  
  11849   Fri Dec 4 18:20:36 2015 gautamUpdateCDSBLRMS for IMC setup[ericq, gautam]

BLRMS filters
have been set up for the coil outputs and
 c1pem_timing.pngC1SUS_overclocked.png 
  11865   Tue Dec 8 23:24:08 2015 gautamUpdateGreen LockingY end laser (Lightwave) PZT calibrationSummary:

I
measured the PZT actuator gain for the Lightwave
 Ycalib_8Dec.pdf 
  11877   Sun Dec 13 21:55:28 2015 gautamUpdateGreen LockingY end laser (Lightwave) PZT calibrationSummary:

After
the discussions at the Wednesday meeting,
 IMG_5972.JPGServoY_TF_13Dec2015.pdfDatanCode.zipPSD_916Hz.pdf 
  11879   Mon Dec 14 16:27:11 2015 gautamUpdateGreen LockingY-end AUX PDH noise breakdownSummary:

I've
attached the results from my measurements
 YAUX_NB_Dec2015.pdfPDH_errSig_Calib.pdf 
  11883   Tue Dec 15 11:22:53 2015 gautamUpdateCDSc1scx and c1asx crashedI noticed what I thought was excessive
movement of the beam spot on ITMX and
ETMX on the control room monitors, and when
 CDS_FE_STATUS_OVERVIEW_15DEC2015.png 
  11886   Wed Dec 16 10:56:22 2015 gautamUpdateCDShard reboot of FB[ericq,gautam]

Forgot to submit this yesterday...

While we were trying to get the
  
  11887   Wed Dec 16 18:34:40 2015 gautamUpdateGreen LockingGreen beat channels temporarily set up as IR beat channelsSince there
are a few hours to go before the locking
efforts tonight, I've temporarily borrowed
  
  11890   Thu Dec 17 14:02:05 2015 gautamUpdateCDSIPC channels for beat frequency control set upI've set up two IPC channels that take
the output from the digital frequency counters
and send them to the end front-ends (via
  
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