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  40m Log, Page 52 of 341  Not logged in ELOG logo
ID Date Author Type Category Subjectup Text Attachments
  6963   Wed Jul 11 14:27:29 2012 YaakovSummarySTACISCurrent STACIS StatusThe X and Y directions in the STACIS still
both oscillate uncontrollably in closed loop,
so I'll be doing my testing in Z for now.
 geo_open_z.pnggeo_open_z2.pngambient_open_z.pngambient_closed_z_geoFeed.pngopenVclosed.GIF 
  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 
  3097   Tue Jun 22 13:38:13 2010 KojiUpdatePhase CameraCurrent phase camera setup. Seeing Acoustic beat1. In terms of the AOM:

How much beam power is  incident
  
  1277   Fri Feb 6 09:52:35 2009 KakeruUpdatePSLCurrent shunt transfar functionI attach the transfar function of the current
shunt.
There is a little gap at 10 Hz for
 TF_CS_gain.pngTF_CS_phase.png 
  11817   Thu Nov 26 19:39:27 2015 KojiUpdateLSCCurrent state of the frequency source, and possible improvementUploaded on T1000461
too.
 RF_Frequency_Source.pdf 
  11821   Sun Nov 29 05:23:57 2015 ranaUpdateLSCCurrent state of the frequency source, and possible improvementI need some more hints to understand the
improvement, although its generally good
to re-build it considering the sad state
  
  11822   Sun Nov 29 12:32:26 2015 KojiUpdateLSCCurrent state of the frequency source, and possible improvementI'm not claiming we need to modify
the frequency source immediately as we are
not limited by the oscillator amplitude or
  
  8060   Mon Feb 11 17:54:02 2013 KojiSummaryOpticsCurvature radii of the G&H/LaserOptik mirrorsI, by chance, found  that my windows
partition has Vision32 installed.
So I run my usual curvature characterization
 TT_Mirrors_RoC.pdf 
  8069   Tue Feb 12 18:28:46 2013 JamieSummaryOpticsCurvature radii of the G&H/LaserOptik mirrors

    

       
            
  
  15798   Wed Feb 10 14:14:58 2021 gautamUpdateElectronicsCustom cables receivedWe received the custom cables to test the
new suspension electronics. They are under
my desk. So we are ready.
 satWiring.pdf 
  13636   Fri Feb 16 01:34:40 2018 gautamUpdateALSD0902745 in-situ testingHaving implemented the changes to the audio
amplifier stage, I re-installed this unit
at the LSC rack, and did some testing. 
 BeatMouthX_20180216.pdfIMG_5134.JPG 
  13644   Tue Feb 20 23:08:27 2018 gautamUpdateALSD0902745 in-situ testingAttachment #1 shows
the ALS noise measurement today. Main differences
from the spectrum posted last week is that
 BeatMouthX_20180220_diffOut.pdf 
  13648   Thu Feb 22 00:09:11 2018 gautamUpdateALSD0902745 in-situ testingI thought a little bit about the design
of the preamp we want for the demodulated
ALS signals today. The requirements are:
 daughterBoard_TF.pdfdaughterBoard_noise.pdfIMG_6906.JPG 
  13616   Wed Feb 7 15:51:15 2018 gautamUpdateALSD0902745 revamp completeSummary of my tests of the demod boards,
post gain modification:


DC tests (supply voltage,
 6613CD37-5014-44AE-B1FE-6F6A8137DF62.jpeg 
  13596   Thu Feb 1 01:24:56 2018 gautamUpdateALSD0902745 revamp underwayI effected the change to the Audio IF preamp
stage on channels 3 and 4 (Xarm and Yarm
respectively) using the resistors Steve ordered
 PSLinterlock.png 
  13599   Fri Feb 2 00:26:34 2018 gautamUpdateALSD0902745 revamp underwayI saw some interesting behaviour of the
Audio IF amplifier stage on the demod board
today, by accident. I was testing the board
  
  14870   Tue Sep 10 17:26:49 2019 KojiUpdateCDSD1900068 SR785 accessory boxI picked up a unit of D1900068 SR785 accessory
box from Dean's office at Downs. 
 P_20190910_171859_1.jpg 
  48   Thu Nov 1 16:51:33 2007 d40AoGGeneralD40[SIZE=3][FONT=Comic Sans MS]If you vant see
D40 againn, you leave one plate goulash by
N2 tank in morning.
 PB010001.JPG 
  13621   Thu Feb 8 00:33:20 2018 gautamUpdateALSD990694 characterization / THD measurement planI decided to try doing the THD measurement
with a function generator. Did some quick
trials tonight to verify that the measurement
 D990694THD_trial.pdf 
  13622   Thu Feb 8 01:27:16 2018 KojiUpdateALSD990694 characterization / THD measurement plan>
So my question is - should we just cut the
  
  13623   Thu Feb 8 12:00:09 2018 gautamUpdateALSD990694 is NOT differential receivingCorrecting a mistake   
  13625   Thu Feb 8 13:13:14 2018 gautamUpdateALSD990694 pulled outAfter labeling all cables, I pulled out
one of the D990694s in the LSC rack (the
one used for the ALS X signals, it is Rev-B1,
 IMG_5131.JPGIMG_5133.JPGD990694-B_cuttingPlan.pdf 
  13627   Thu Feb 8 18:10:36 2018 gautamUpdateALSD990694 pulled outThis is proving much more challenging than
I thought - while Cut #1 was easy to identify
and execute, my initial plan for Cut #2 seems
  
  12983   Wed May 10 17:17:05 2017 gautamUpdateGeneralDAC / Coil Driver noiseSuspension
Actuator noise:

There
are 3 main sources of electronics noise which
 actuation.jpg 
  12984   Wed May 10 17:46:44 2017 gautamUpdateGeneralDAC / Coil Driver noise - SRM coil driver + dewhite board removedI've
removed the SOS coil driver (D010001-B,
  
  12985   Thu May 11 09:45:46 2017 ranaUpdateGeneralDAC / Coil Driver noise - SRM coil driver + dewhite board removedI believe the ETMs and ITMs are different
from the others.
  
  8814   Tue Jul 9 18:44:37 2013 gautamUpdateCDSDAC Interface Board-Pin Outs  Summary:
The pin-outs for the DAC interface
board have been determined.
 DAC_Interface_Board_Pin-out.pdfbreak-out_ribbon.JPG 
  8853   Mon Jul 15 17:59:31 2013 gautamConfigurationendtable upgradeDAC at 1Y4- Power Spectrum -6.4kHz bandwidth

    

       
            
 DAC-6.4_kHz_BW_PSD.pdf 
  8848   Mon Jul 15 15:54:20 2013 gautamConfigurationendtable upgradeDAC at 1Y4- Power Spectrum -with the right units

    

       
            
 DACOffPSD.pdfDAC500PSD.pdfDAC2000PSD.pdf 
  8852   Mon Jul 15 17:20:43 2013 JenneConfigurationendtable upgradeDAC at 1Y4- Power Spectrum -with the right unitsThose 'peaks' for the oscillations seem
ridiculously broad.  I think you should
look again, really quickly, with smaller
  
  8845   Mon Jul 15 11:51:18 2013 gautamConfigurationendtable upgradeDAC at 1Y4-Max Output and Power Spectrum Summary:
I measured the maximum output of
the DAC at 1Y4 as well as its power spectrum.
 max_amp.JPGmax_amp_all_channels.JPGDACOffPowerSpec.pdfDACOnPowerSpec.pdfDAC2kPowerSpectrum.pdf 
  8846   Mon Jul 15 13:51:17 2013 KojiConfigurationendtable upgradeDAC at 1Y4-Max Output and Power SpectrumWe need the unit of the voltage power spectrum
density to be V/sqrt(Hz).
  
  9377   Wed Nov 13 18:37:19 2013 ranaConfigurationElectronicsDAC available in c1lsc IO chassis for DAFI    
  11222   Wed Apr 15 21:00:56 2015 JenneUpdateLSCDAC fineThe DAC was fine.  I realized tonight
that the digital filter bank outputs were
off, so I wasn't actually sending signals
  
  13489   Wed Dec 20 00:43:58 2017 KevinSummaryGeneralDAC noise contribution to squeezing noise budgetGautam and I looked into the DAC noise
contribution to the noise budget for homodyne
detection at the 40m. DAC noise is currently
 40m_squeezing.pdf40mDAC_squeezing.pdf 
  13490   Thu Dec 21 19:25:48 2017 KevinSummaryGeneralDAC noise contribution to squeezing noise budgetGautam and I redid our calculations, and
the updated plot of squeezing as a function
of DAC current noise per coil is shown in
 40mDAC_squeezing.pdf 
  13491   Fri Dec 22 09:40:19 2017 ranaSummaryGeneralDAC noise contribution to squeezing noise budget
Should not count the ITMs. On those
we can use big resistors / filters to cut
out the noise.
For the initial
  
  13003   Mon May 22 13:37:01 2017 gautamUpdateGeneralDAC noise estimateSummary:

I've
 DAC_noise_model.pdfC1NB_disp_40m_MICH_NB_22_May_2017.pdf 
  13328   Fri Sep 22 18:12:27 2017 gautamUpdateLSCDAC noise measurement (again)I've been working on setting up some
scripts for measuring the DAC noise.

In all the DRMI noise budgets I've
  
  13336   Wed Sep 27 22:25:21 2017 gautamUpdateLSCDAC noise measurement (again)Attachment
#1: Summary of results of measurements
 coilNoises.pdf 
  13338   Thu Sep 28 06:35:44 2017 ChrisUpdateLSCDAC noise measurement (again)Since you're monitoring two channels
simultaneously, you could try subtracting
them, as an alternative to carving out bandstops.
  
  13343   Thu Sep 28 23:50:04 2017 gautamUpdateLSCDAC noise measurement (again)I
am running some more measurements of the
DAC noise, for which I've shut down
  
  13347   Fri Sep 29 18:36:25 2017 gautamUpdateLSCDAC noise measurement (again)BS connections and damping restored.




  
  8942   Tue Jul 30 19:40:47 2013 gautamConfigurationendtable upgradeDAC-PZT Driver Board Output Signal Chain Tested 
 [Alex, Gautam]
  
  3428   Tue Aug 17 02:07:11 2010 YoichiUpdateCDSDACs have correct number of channels


   
        
            
  
  12173   Mon Jun 13 20:01:30 2016 varunUpdateCDSDAFI GUI updateSummary: I am implementing
digital audio filtering on various interferometer
signals in order to listen to the processed
 C1DAF_OVERVIEW.pngC1DAF_INPUTS.pngC1DAF_LSC.pngMONITOR.png 
  12180   Tue Jun 14 20:10:19 2016 varunUpdateCDSDAFI GUI updateI have added Enable buttons for each of
the DSP blocks, and labels for the matrix
elements. The input matrix takes inputs from
 C1DAF_OVERVIEW.pnginput_matrix.pngoutput_matrix.png 
  12321   Thu Jul 21 15:03:13 2016 varunUpdateCDSDAFI Update1) I have added the status summary of the
DAFI block to the main FE status overview
screen in the c1lsc cloumn. (attachment 1)
 festatus.pngmatrices.png 
  12361   Mon Aug 1 20:09:37 2016 ranaUpdateCDSDAFI UpdateI found the DAFI screen as a button inside
of the LSC screen - I think its more logically
found from the sitemap, so I'll move
  
  12320   Thu Jul 21 14:27:24 2016 varunUpdateCDSDAFI Update: Arbitrary Math blockSummary: I have added
an arbitrary math block to the DAFI model,
which takes two inputs, say X and Y, and
 dafioverview.pngarbmath.png 
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