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  40m Log, Page 339 of 341  Not logged in ELOG logo
ID Date Authordown Type Category Subject Text Attachments
  4471   Wed Mar 30 21:43:31 2011 Aidan, KiwamuSummaryGreen LockingCalculation of the green contrast on the RF PDSkip to final thought ...
Kiwamu and I have set about measuring
the contrast of the signal on the RF PD.
  
  4472   Wed Mar 30 21:46:10 2011 Aidan, KiwamuUpdateGreen LockingStates of the Green beat noteThe attached table shows the amplitude
of the green beat note when the end laser
was in various states. We can increase the
  
  3096   Tue Jun 22 09:45:21 2010 Aidan, Joe, RazibUpdatePhase CameraCurrent phase camera setup. Seeing Acoustic beat We've set up a preliminary test bed
for the phase camera. It simply uses a HeNe
that is split into two beams. One is frequency
 2010-06-22_Phase_camera_layout_version_1.pdf 
  4213   Thu Jan 27 17:12:02 2011 Aidan, JoeSummaryGreen LockingDigital Frequency to Amplitude converterJoe and I built a very simple digital frequency
to amplitude converter using the RCG. The
input from an ADC channel goes through a
 Screenshot.pngSwept_sine_F_to_A.png 
  4218   Fri Jan 28 10:27:46 2011 Aidan, JoeSummaryGreen LockingDigital Frequency Discriminator - calibration One more thing ... we can calibrate
the output of the LP filter to give a result
in Hz with the following calibration:
  
  4401   Thu Mar 10 16:00:53 2011 Aidan, JoeUpdateGreen LockingIntensity stabilization loop using beatnote DC.Aidan: Joe and I have added a channel that
takes the DC output from the vertex beatnote
PD and sends it, via RFM, to a DAC at the
 P1000313.jpgP1000314.jpgP1000315.jpgGREEN_ISS_LOOP.pdfScreenshot-C1ALS_OVERVIEW.adl.png 
  2835   Fri Apr 23 18:30:49 2010 Aidan, Jenne, KojiSummaryGreen LockingGreen means GO!Jenne, Koji and I assembled the Covesion
Oven today, inserted a PPKTP crystal from
Raicol, aligned the crystal to a 50mW focus
 IMG_2405.jpgIMG_2417.jpg 
  4521   Wed Apr 13 23:32:07 2011 Aidan, JamieConfigurationLSCAS PD and Camera installedI spent some time tracking down the AS
beam which had vanished from the AP table.
Eventually, by dramatically mis-aligning
 AS_beam.jpgP1070546.JPG 
  4536   Fri Apr 15 22:57:38 2011 Aidan, JamieConfigurationLSCAS PD and Camera installedAS port ITMX YAW  range where AS beam
was visible = [-1.505, -1.225] - these extrema
put the beam just outside of some aperture
  
  4534   Fri Apr 15 22:54:20 2011 Aidan, BryanUpdateGreen LockingBeat note amplitude on Vertex PDI was investigating the beat note amplitude
on the vertex PD again yesterday. The incident
power on the PD was 150uW in the PSL green
  
  742   Sat Jul 26 15:09:57 2008 AidanUpdateComputersReboot of op440m
I was reviewing the PSL Overview screen this
afternoon and op440m completely froze when
  
  1205   Mon Dec 29 18:01:07 2008 AidanUpdateAuxiliary lockingUpdated 40m Upgrade Document T080074-00-R
Added a paragraph to the 40m Upgrade document
describing the fiber stabilization and frequency
  
  1687   Fri Jun 19 13:39:29 2009 AidanUpdateGeneralUpper limit measurement of the scatter from the eLIGO beam dumps. 
 D0900095_ELIGO_35_WATT_AIR_COOLED_BEAM_DUMP_3INCH_P.POL-3.PDFbeam_dump_expt.pngscatter_measurement1.pdfBRDF1.pdfIMG_0308.JPG 
  1782   Thu Jul 23 07:34:45 2009 AidanUpdateCDSAdded C2 MEDM screens to 40m SVN. 
See Adhikari eLOG entry: http://nodus.ligo.caltech.edu:8080/AdhikariLab/194
  
  2792   Mon Apr 12 17:48:32 2010 AidanUpdateComputer Scripts / Programselog restarted The elog crashed when I was uploading
a photo just now. I logged into nodus and
restarted it.
  
  2793   Mon Apr 12 19:50:30 2010 AidanSummaryGreen LockingTemperature sweep of the Lightwave: df/dT = 2.8GHz/KThe beams from the Innolight and Lightwave
NPROs were both incident on a 1GHZ New Focus
PD. Mott and I swept the temperature of the
 LightWave_temp_sweep.pdfLightWave_Temp.m 
  2807   Mon Apr 19 11:31:04 2010 AidanUpdateGreen Locking1W NPRO output profile

    

       
            
  
  2809   Mon Apr 19 16:27:13 2010 AidanUpdateGreen LockingRaicol crystals arrived and we investigated themJenne, Koji and I opened up the package
from Raicol and examined the crystals under
the microscope. The results were mixed and
  
  2816   Tue Apr 20 11:14:31 2010 AidanUpdateGreen LockingRaicol crystals arrived and we investigated them 
 Here
is Crystal 724 polished side 2 with all photos
  
  2910   Tue May 11 14:39:17 2010 AidanUpdateGreen LockingGreen Laser Beam Profile 
 Here's a photo of the set-up
used. The beam profile is measured relative
 P5110057_beams.jpg 
  2951   Wed May 19 14:36:46 2010 AidanHowToPhase CameraPhase Camera algorithm and stuff I had a think about the algorithm
we might use for the phase camera measurement.
MATLAB has an fft function that will allow
 phase_camera_DC_comp.pdfphase_camera_F1_comp.pdfphase_camera_F2_comp.pdfload_raw_data.m 
  2955   Thu May 20 10:06:56 2010 AidanHowToPhase CameraPhase Camera- raw data video    
  2995   Wed May 26 18:54:55 2010 AidanSummaryGreen LockingMounted Crystal 724 in the Doubling OvenAndri and I mounted the Raicol Crystal
#724 in one of the new Covesion Ovens. The
procedure was the same as before - see
  
  2998   Thu May 27 08:22:57 2010 AidanUpdateComputersRestarted the elog this morning    
  3082   Wed Jun 16 18:14:13 2010 AidanUpdateGeneralGlass cover from overhead light smashed on PSL tableI was giving a tour of the 40m yesterday.
We were looking at the PSL table. About 30
seconds after I turned the lights on a glass
 DSC_1769.JPGDSC_1768.JPG 
  3113   Thu Jun 24 06:49:29 2010 AidanUpdateGreen Lockinga channel for PPKTP temperatureIs this a setpoint temperature that we
can change by writing to the channel or is
it a readout of the actual temperature of
  
  3421   Fri Aug 13 15:29:35 2010 AidanFrogsPhotosHere's the 40m team   40m_team.JPG 
  3756   Thu Oct 21 19:10:39 2010 AidanUpdatePSLFound the beat at 1064nm    
  3766   Fri Oct 22 21:28:27 2010 AidanUpdateLockingGreen era: found a green beat note finallyNice work!
  
  3907   Fri Nov 12 11:36:06 2010 AidanConfigurationComputersFixed the PERL PATH errors from the scripts directory change I've been trying to get a PID loop
running for the green locking and I've discovered
that some of the directories in the path
  
  3908   Fri Nov 12 12:06:11 2010 AidanConfigurationGreen LockingPID script working - now it needs to be tuned I've set up a PID script that senses
the EX-PSL Green Beat note (from the frequency
counter) and actuates on the temperature
 Screen_shot_2010-11-12_at_12.05.01_PM.png 
  3922   Mon Nov 15 14:42:01 2010 AidanUpdatePSLC1PSL rebooted? Yeah. Joe and I rebooted c1psl a couple
of times this morning. I didn't realize the
burtrestore wasn't automatic.
  
  3930   Tue Nov 16 09:02:54 2010 AidanUpdateGreen LockingPID loop - calibration of SR620 output [Aidan, Kiwamu]
Kiwamu and I roughly calibrated the
analogue output from the SR620 frequency
  
  3931   Tue Nov 16 10:47:45 2010 AidanUpdateGreen LockingRebooted c1psl - added new GRNBEAT_FREQ channelI restored C1:PSL-126MOPA_126MON to its
original settings (EGUF = -410, EGUL = 410)
and added a new calc channel called C1:LSC-EX_GRNBEAT_FREQ
  
  3932   Tue Nov 16 12:47:30 2010 AidanUpdateGreen LockingPID loop but no greenThe PID loop is ready to be run on the
green beat note but, since the tanks are
open, there is no green transmission from
 Screenshot-C1LSC_EX_GRN_SLOW.adl.png 
  3934   Tue Nov 16 16:00:26 2010 AidanUpdateGreen LockingPID loop but no green

    

       
            
  
  4040   Fri Dec 10 09:58:57 2010 AidanUpdateSUSbeam pointing has been doneGood news. I feel multi-chromatic-locking
success is just around the corner.
By the way, there's a new presentation
  
  4177   Thu Jan 20 15:39:59 2011 AidanUpdateLockingUpper limit on frequency noise of ADC[Aidan, Kiwamu]
Kiwamu and I plugged the output from
a DS3456 function generator into the ADC
 Sine-wave-width-test_of_ADC.pdf 
  4178   Thu Jan 20 17:00:39 2011 AidanConfigurationLockingBallpark figures for Green Locking PLLs (Digital vs Analogue)If we use a digital PLL for locking the
frequency of the PSL and END green lasers
then we can expect a UGF of around 1kHz (assuming
  
  4182   Fri Jan 21 11:45:01 2011 AidanConfigurationLockingBallpark figures for Green Locking PLLs (Digital vs Analogue)

    

       
            
  
  4205   Wed Jan 26 10:11:47 2011 AidanUpdateGreen Lockingcavity scan

    

       
            
  
  4209   Wed Jan 26 14:49:48 2011 AidanUpdateEnvironmentTurned on Control room AC80 degrees is too uncomfortable in the
control room so I turned on the AC. The set
point is 74F.
  
  4217   Fri Jan 28 09:03:38 2011 AidanSummaryGreen LockingDigital Frequency Discriminator

    

       
            
  
  4227   Sun Jan 30 17:15:09 2011 AidanSummaryGreen LockingDigital Frequency discriminator - frequency noiseI've had a go at trying to estimate the
frequency noise of the digital frequency
discriminator (DFD). I input a 234.5Hz (0.5Vpp)
 _Untitled_(modified).png 
  4229   Mon Jan 31 07:03:59 2011 AidanSummaryGreen LockingDFD - noise spectra

    
        
 DFD-bandwidth_noise.pdf 
  4230   Mon Jan 31 07:41:23 2011 AidanUpdateGreen LockingDFD - medm screenI added an MEDM screen for the DFD to the
GREEN screen. It is displayed in the attached
screen shot.
 Screenshot-3.png 
  4234   Mon Jan 31 18:25:25 2011 AidanUpdateGreen LockingDFD - results from the new filters (and running with AWG)


   
        
            
 DFD-bandwidth_noise_CLP500_to_300Hz.pdfDFD-bandwidth_noise_CLP500_to_7000kHz.pdf 
  4245   Thu Feb 3 16:08:06 2011 AidanUpdateComputer Scripts / ProgramsRCG VCO frequency errorJoe and I were looking at the RCG VCO algorithm
to determine if we could adapt it to run
at a faster rate (you can currently change
 VCO_error.pdf 
  4259   Tue Feb 8 10:23:02 2011 AidanSummaryGreen LockingDigital Frequency Discriminator - reference 
Here's the reference for the self-reference
frequency detection idea. See Figure 2.
  
  4260   Tue Feb 8 13:26:11 2011 AidanSummaryGreen LockingTemperature dependence of phase change of green on reflection I did a quick back of the envelope
calculation of the expected green phase change
on reflection from the aLIGO ITM.
  
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