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ID Date Author Type Category Subject Text Attachments
  10244   Mon Jul 21 10:30:38 2014 HarryUpdateGeneralFiber Mode Measurement Purpose
The idea was to measure the profile
of the light coming out of the fiber, so
 fiberModeMeasurement.pngfiberModeFit2.pngfiberModeMeasurement2.zip 
  10243   Sun Jul 20 09:26:27 2014 EvanUpdateElectronicsMC servo card modifications in DCC

    

       
            
  
  10242   Sat Jul 19 20:51:51 2014 KojiUpdateLSCRIN in arm transmissionYour
calibration of the ALS signal should be revised.
The phase for the ALS is not an optical
  
  10241   Sat Jul 19 17:36:44 2014 JenneUpdateLSCRIN in arm transmissionI looked at what the RIN contribution of
the sqrtInv sensor is by locking the arms
individually on IR using POX and POY. 
 TransSqrtInvRIN_vs_ALSsensing_18July2014.pngThorlabsRIN_16July2014.png 
  10240   Sat Jul 19 01:59:34 2014 HarryUpdateGeneralFiber Mode MeasurementPurpose 
We wanted to measure the mode coming
out of the fibers, so we can later couple
 fiberModeMeasurement.pngfiberModeMeasurement1.pngfiberModeMeasurement1.zip 
  10239   Fri Jul 18 19:32:50 2014 AkhilSummaryElectronicsFilters used inside the Frequency Counter 
 Thanks Koji , for your  hint
for the brain teasing puzzle. I was looking
 TheoreticalGainPlot.pngTFexpected.png 
  10238   Fri Jul 18 17:10:57 2014 NichinSummaryElectronicsCharacterization of demodulator boards.Rack 1Y2, I took transfer function measurements
for each of the following demodulator boards:
REFL11, REFL33, REFL55, REFL165, AS55, POP22,
 Demodulators_TF.pdf 
  10237   Fri Jul 18 16:52:56 2014 AndresUpdate40m Xend Table upgradeFInish Calculation on Current X-arm mode Matching

    

       
            
 OldAndNewSetupPlotsOfDisplacementAndAngleAtTheETM.pngOldSetUpDisplacementAndNewSetup.m.zip 
  10236   Fri Jul 18 15:21:12 2014 ericqUpdateComputer Scripts / ProgramsLocal Chiara backups

    

       
            
  
  10235   Fri Jul 18 14:59:07 2014 EvanUpdateIOOMC servo TFs[Rana, Evan]
This morning we took several TFs
of the MC servo board using the HP4395A.
 mcServoTFSettings.pngMCtfs.pdf 
  10234   Thu Jul 17 22:08:14 2014 KojiUpdateGeneral1X2 Rack ChangesIt sounds like the work was done carefully.
Even so, Jenne or Manasa have to run the
ALS (X and Y) to check if they are still
  
  10233   Thu Jul 17 21:01:28 2014 ManasaUpdateGeneral1X2 Rack Changes

    

       
            
  
  10232   Thu Jul 17 17:39:57 2014 KojiUpdateElectronicsPDFR debugging attempt : REFL11What is the coupling factor between the
RF in and the RF mon of the demodulator?
  
  10231   Thu Jul 17 17:19:25 2014 SteveUpdatePSLPSL Innolight controller fan is dying with extra fan

    

       
            
 fanadded.png 
  10230   Thu Jul 17 17:08:58 2014 HarryUpdateGeneral1X2 Rack Changes Purpose
 
Steve and I moved some things around
 1X2Changes.png 
  10229   Thu Jul 17 16:39:34 2014 NichinUpdateElectronicsPDFR debugging attempt : REFL11In a attempt to debug the values of transimpedance
generated by the PDFR system, I did a manual
measurement for REFL11 PD.
 REFL11_17-07-2014_154534.pdfREFL11_17-07-2014_154534.zip 
  10227   Thu Jul 17 16:07:34 2014 Emily UpdateElectronicsVCO DriverI took back he VCO driver that Reetika
brought over to the 40m from the PSL lab.
 
  
  10226   Thu Jul 17 02:57:32 2014 AndresUpdate40m Xend Table upgradeFInish Calculation on Current X-arm mode MatchingData and Calculation for the
Xarm Current Mode Matching
 RawDataForTheModeGreenScan.pngResultForModeMatching.pngDataAndCalculationOfModeMismatch.zip 
  10225   Thu Jul 17 01:24:35 2014 ranaUpdateIOOMC / EOM Stability Mystery Solved!MC loop is near
unstable. Common gain reduced. Needs more
 MC_OLG.pdf 
  10224   Thu Jul 17 00:38:30 2014 JenneUpdateLSCRIN in arm transmission[Rana, Jenne]
We had a look at the RIN of the transmission
signals TRX and TRY, when the arms were individually
 TransRIN.pdf 
  10223   Wed Jul 16 23:02:16 2014 KojiSummaryElectronicsBode Plots and complete Characterization of Frequency CounterIf I assume 1sample delay for 0.1s sampling
rate, the delay is Exp[-I 2 pi f T], where
T is the sampling period.
  
  10222   Wed Jul 16 22:17:40 2014 AkhilSummaryElectronicsBode Plots and complete Characterization of Frequency CounterGoal:
To estimate the transfer function
and the noise in the FC that is a part of
 Phase_Data.zipBode100MHz.png 
  10221   Wed Jul 16 21:24:41 2014 ReetikaUpdateElectronicsVCO Driver inside 40m  
I
found the VCO driver, that Rana asked me
  
  10220   Wed Jul 16 21:23:35 2014 ManasaUpdatePSLPSL Innolight controller fan is dying[Koji, Manasa]
The air flow from the dying fan was
kinda weak and we decided to give a help
 IMG_1659.JPGIMG_1658.JPG 
  10219   Wed Jul 16 19:38:37 2014 manasaSummaryPSLAOM alignment issues and removed from beam pathAOM removed
from the beampath and PMC relocked. 
 AOMremoved.jpg 
  10218   Wed Jul 16 17:34:11 2014 HarryUpdateGeneralFiber Coupled Purpose
To couple the spare NPRO into our
Panda PM980 fibers, in order to carry out
 fiberTestCouplingSchematic.png 
  10217   Wed Jul 16 17:06:41 2014 NichinUpdateComputer Scripts / ProgramsHP8591E spectrum analyzer remote scanUpdated script does the following:
1) Gets the highest 2 peaks
2) Puts a marker on the peaks. Now
 HP8591E_View.pdf 
  10216   Wed Jul 16 15:26:48 2014 SteveUpdatePSLPSL Innolight controller fan is dying

    

       
            
  
  10215   Wed Jul 16 07:51:52 2014 AkhilUpdateGeneralWeekly UpdateWork
Done:

    Solved all the timing
  
  10214   Wed Jul 16 02:22:10 2014 KojiUpdateElectronicsTest run of PDFR systemLog-log ...    
  10213   Wed Jul 16 01:54:25 2014 NichinUpdateGeneralWork plan for next week1) Debugging transimpedance calculations
in the PDFR
Requires
  
  10212   Wed Jul 16 01:46:41 2014 NichinUpdateElectronicsTest run of PDFR systemA test run was conducted on the PDFR system
last afternoon and transimpedance plots were
generated for 6 of the PDs. The laser
 PDFR_testRun_15-07-2014.pdf 
  10211   Wed Jul 16 01:35:16 2014 KojiSummaryLSCPython Wavelet peak finding for dramatic ALS - Red Resonance finding speedupFrom the last plot:
- Subtracting the offset of 0.0095,
the modulation depth were estimated to be
  
  10210   Wed Jul 16 01:27:01 2014 NichinHowToComputer Scripts / ProgramsHP8591E spectrum analyzer remote scanThe script for running continuous scans
on HP 8591E spectrum analyzer is located
at scripts/general/netgpibdata
 HP8591E_View.pdf 
  10209   Wed Jul 16 01:18:02 2014 ranaSummaryLSCPython Wavelet peak finding for dramatic ALS - Red Resonance finding speedupNew script called scripts/ALS/findRedResonance.py
finds the IR resonance in less than 20 seconds.

    Do a ~2 FSR scan of the
 findRedResonance.pdf 
  10208   Wed Jul 16 01:04:09 2014 JenneUpdateLSCData for DARM on sqrtInv investigationI realized while I was looking at last
night's data that I had been doing CARM sweeps,
when really I wanted to be doing DARM sweeps. 
  
  10207   Tue Jul 15 22:23:51 2014 AndresUpdate40m Xend Table upgradeScan the Xarm for the mode matching Nick and I with the help of Jenne
scan the green light when the cavity is unlocked.
Nick placed a Beam dump on the IR so that
  
  10206   Tue Jul 15 21:43:28 2014 JenneUpdateLSCQPDs backI removed the dumps in front of the trans
QPDs.  The Yend QPD needed re-normalization,
so I did that.
  
  10205   Tue Jul 15 18:39:04 2014 HarryUpdateGeneralWeekly Plan (7.16.14) The Past Week
 
Attempted to design coupling telescope,
  
  10204   Tue Jul 15 18:26:40 2014 HarryUpdateGeneralBeam Waist, Telescope, and Fiber Coupling Goal
To design an optical setup (telescope
/ lens) to couple 1064nm NPRO light into
 fiberTestingSetup.pngfiberTestingCouplingDesign.pngfiberTesting.zip 
  10203   Tue Jul 15 17:34:01 2014 manasaUpdatePSLproposing AOM re-alignmentI am going to tweak the alignment of the
beam into the AOM (before the PMC) tomorrow
morning. If anybody has any objections to
  
  10202   Tue Jul 15 12:36:17 2014 NichinUpdateElectronicsRF cables rerouted

    

       
            
  
  10201   Tue Jul 15 11:04:05 2014 SteveUpdatesafetysafety glasses must be worn all times!This is the third safety glasses that I
found laying around in the IFO lab lately.
Safety
 safetyglasses.jpg 
  10200   Tue Jul 15 01:41:43 2014 JenneUpdateLSCData for DARM on sqrtInv investigationI took some data tonight for a quick look
at what combinations of DC signals might
be good to use for DARM, as an alternative
  
  10199   Tue Jul 15 01:31:13 2014 AkhilSummaryElectronicsTiming Issues of Mini Circuits UFC-6000: SolvedThe attached are the PSD plots with improved
FC timing(with the same code as in http://nodus.ligo.caltech.edu:8080/40m/10151).
More plots(Phase and PSD) to follow.
 qnoise.pngqnoise.pdf 
  10198   Tue Jul 15 00:16:52 2014 JenneUpdateSUSPRM significantly pitchedI'm starting to lock for the night, and
I noticed that PRM is very, very pitched. 
Why?  
  
  10197   Mon Jul 14 17:51:34 2014 NichinUpdateComputer Scripts / ProgramsMEDM for PDFR systemA  14.png 
  10196   Mon Jul 14 16:51:07 2014 NichinUpdateElectronicsMartian table updated, Named server restarted [Nichin, Jenne]
The martian lookup tables are located
at 
  
  10195   Mon Jul 14 16:19:41 2014 AndresUpdate40m Xend Table upgradeTook the measurement for the Mode Matching Nick
and I measured the reflected power of the
green light in locked and unlocked. I'm working
  
  10194   Mon Jul 14 14:28:27 2014 KojiSummaryElectronicsTiming Issues of Mini Circuits UFC-6000: SolvedLooks good. Now you have the internal timer
to verify the external clock. 
If you can realize the constant rate
  
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