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ID Date Authordown Type Category Subject Text Attachments
  10104   Wed Jun 25 19:29:19 2014 AkhilUpdateElectronicsAnalog-to-Digital Converter I have been trying to use an ADC
with the Raspberry Pi to be able to measure
the phase difference between FC input and
 IMG_1496.png 
  10107   Fri Jun 27 12:54:13 2014 AkhilUpdateElectronicsGain plots of UFC-6000 for 0.1s Sampling Rate  Finally, the 0.1s sampling rate of
the frequency counter(FC) has been achieved.
For this I had to :
 Sampling-0.1s.pdf12.png 
  10118   Tue Jul 1 21:20:37 2014 AkhilUpdateElectronicsGain plots of UFC-6000 for 0.1s Sampling Rate  The attached are the gain plots at
carrier frequencies of 100 MHz, 500 MHz and
1 GHz measured using IFR 2023B (Marconi).
 gain.pnggain.pdf 
  10129   Fri Jul 4 09:17:13 2014 AkhilConfigurationElectronicsSetup Used for Characterization of Frequency Counter Goal:
To
 setup.pdf 
  10137   Mon Jul 7 13:56:13 2014 AkhilConfigurationElectronicsSetup Used for Characterization of Frequency CounterWhen I was trying to plot PSD of the measurements,
I still couldn't get better resolution. There
still seems to be a problem with timing and
 FreqVsTime.pngMissing_Data.png 
  10151   Tue Jul 8 09:02:02 2014 AkhilUpdateElectronicsPSD Plots for different sampling times of the Frequency Counter Although there were few timing issues
with the FC and the Raspberry Pi at the lowest
sampling time of the FC (0.1s) even after
 7x 
  10161   Wed Jul 9 08:50:30 2014 AkhilUpdateGeneralWeekly Update 
Last
Week's Work
  
  10163   Wed Jul 9 12:01:43 2014 AkhilConfigurationElectronicsSetup Plan for placing the Frequency Counter inside the labToday, me and Manasa went inside the lab
to figure out a place for the place for the
FC. The whole setup will be placed in a chassis
 setup.pngSetupFC.png 
  10178   Thu Jul 10 17:53:19 2014 AkhilConfigurationComputer Scripts / ProgramsEPICS installed on Raspberry Pi I finished the installation of EPICS   
  10193   Mon Jul 14 13:03:23 2014 AkhilSummaryElectronicsTiming Issues of Mini Circuits UFC-6000: SolvedMain
Problem:
The frequency counter (FC) takes
 0.2timinganalysis.png0.3timinganalysis.png0.5timinganalysis.png1stiminganalysis.pngpdf.zip 
  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 
  10215   Wed Jul 16 07:51:52 2014 AkhilUpdateGeneralWeekly UpdateWork
Done:

    Solved all the timing
  
  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 
  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 
  10246   Mon Jul 21 12:16:27 2014 AkhilSummaryElectronicsFilters used inside the Frequency CounterThe expected bode plots for such
a filter with L= 4 is attached and compared
 FC_TF_Characterization.png 
  10257   Tue Jul 22 23:10:12 2014 AkhilUpdateGeneralWeekly Update Work
Done
  
  10261   Wed Jul 23 11:15:54 2014 AkhilUpdateElectronicsInstallation of FCs in the 40m As a part of installation of two(X-ARM
and Y-ARM) frequency counters in the 40m,
I have tested their performance when using
 Timingwith2FCs.png 
  10272   Thu Jul 24 19:28:43 2014 AkhilUpdateGeneralThermal Actuator Transfer Functions As a part of temperature actuator
characterization, today Eric Q and I made
some measurements for the open loop TF of
 TF-X-ARM.pdfTF-Y-ARM.pdf 
  10274   Sat Jul 26 10:12:19 2014 AkhilUpdateGeneralData Acquisition from FC into EPICS Channels I succeeded in creating a new channel
access server hosted on domenica ( R Pi)
for continuous data acquisition from the
  
  10275   Sat Jul 26 13:10:14 2014 AkhilUpdateGeneralThermal Actuator Transfer FunctionsKoji said that the method we used for X-arm
thermal actuator TF measurement was not correct
and suggested us to make measurements separately
 TFX_new.pdf 
  10277   Sat Jul 26 14:35:28 2014 AkhilUpdateGeneralData Acquisition from FC into EPICS Channels

    

       
            
  
  10281   Mon Jul 28 16:34:02 2014 AkhilUpdateGeneralCalibration of measured Thermal Actuator TFs To calibrate the measured TFs and
characterize the thermal actuator for the
FOL loop, we [ Me, Eric Q, Koji ] made the
 mirrorTF2.pdf 
  10283   Mon Jul 28 17:53:00 2014 AkhilUpdateGeneralWork plan for the Upcoming weeks- FOL Project [Akhil, Harry]
Work
Completed
  
  10286   Tue Jul 29 18:00:20 2014 AkhilUpdateLSCCalibration of ETMX and ETMY actuatorsThe ultimate goal of characterizing the
temperature actuator turned to be fruitful
in obtaining the calibration values for ETMX
 PZT_ETMX_TF.pngPZT_ETMY_TF.pngPZT_ITMX_TF.pngPZT_ITMY_TF.png 
  10297   Wed Jul 30 11:15:44 2014 AkhilUpdateGeneralWeekly Update Plan for the week:

    PID loop design and testing
with the Green laser beat note by actuating
  
  10298   Wed Jul 30 15:33:48 2014 AkhilSummaryGeneralCalibrated Thermal Actuator TFs The goal of the measurements we made
( my previous 3 elogs) was to characterize
the laser frequency thermal actuator that
 Y_Arm_TA_TF.pdfX_Arm_TA_TF.pdfY_Arm_TA_with_fit.pdfX_Arm_TA_with_fit.pdf 
  10304   Thu Jul 31 11:54:54 2014 AkhilSummaryElectronicsPZT Calibration Koji asked me to get the calibration
of the PZT counts to Volts for the the X
and Y ends. Yesterday, I went inside the
 PZT_Y_Calibration.pdfPZT_X_Calibration.pdf 
  10307   Thu Jul 31 14:23:28 2014 AkhilSummaryElectronicsPZT Calibration 
 The PZT seems to saturate at
around +/- 3500 counts. So for the Y arm,
 PZT_Y_Calibration.pdf 
  10324   Fri Aug 1 18:48:46 2014 AkhilSummaryElectronicsPZT Calibration 
 The PZT actuation on the laser
frequency in MHz/V ( assuming the previous
  
  10333   Tue Aug 5 19:05:41 2014 AkhilUpdateGeneralBeat Note Testing on EPICS Channels    
  10334   Tue Aug 5 19:20:05 2014 AkhilUpdateGeneralPID loop Design for beat note stabilization Today I and EricQ went inside the
lab and set up the cables running from the
a DAC channel into  PZT input so that
  
  10352   Fri Aug 8 14:27:18 2014 AkhilUpdateComputer Scripts / ProgramsFOL Scripts The scripts written for interfacing
the FC with R Pi, building EPICS database,
piping data into EPICS channels,PID loop
  
  10353   Fri Aug 8 14:42:41 2014 AkhilUpdateGeneralPID loop Design for beat note stabilization The attached in a zip file are the
Simulink feedback loop models for the FOL
for both X and Y ends. The controller PID
 PID.zip 
  2794   Mon Apr 12 20:48:51 2010 Aidan, MottSummaryGreen LockingTemperature sweep of the Innolight: df/dT ~ 3.3GHz/K

    
        
 Innolight_temp_sweep.pdfInnolight_Temp.m 
  2797   Tue Apr 13 12:39:51 2010 Aidan, MottSummaryGreen LockingTemperature sweep of the Innolight: df/dT ~ 3.3GHz/KPlease put those numbers onto wiki somewhere
at the green page or laser characterization
page.
  
  4441   Thu Mar 24 19:48:13 2011 Aidan, KiwamuUpdateGreen LockingDesigns for permanent electronics for ALSKiwamu and I looked at all the electronics
that are currently in place for the green
locking on the X-arm and have made a set
 GreenLockingElectronics.pdfGreenEndPDHsupportboxandLO.pdfVertexBeatnoteAmplifierandComparator.pdfMixerFrequencyDiscriminator.pdf 
  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
  
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