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ID Date Author Type Category Subjectup Text Attachments
  860   Wed Aug 20 12:04:47 2008 JenneUpdateSUSBetter diagonalization of PRM input matrixThe values here should replace those in entry
#851 from yesterday.
 PRM_Eigmodes_shihori.pngPRM_Eigmodes_sonia.png 
  1237   Mon Jan 19 13:58:53 2009 YoichiUpdateASCBetter ditherServo.plNick Smith (@LHO) tested the ditherServo.pl
at Hanford.
He added options to specify exit conditions
  
  11502   Thu Aug 13 12:06:39 2015 Jessica SummaryIOOBetter predicted subtraction did not work as well OnlineYesterday I adjusted the preweighting of
my IIR fit to the transfer function of MC2,
and also managed to reduce the number of
 6x 
  11500   Wed Aug 12 16:48:26 2015 IgnacioUpdateIOOBetter? Nope. MISO WIener (T240-X and T240-Y) FF of MCLLast night, I also worked on a "better"
(an improvement, I thought) of the MISO Wiener
filter (T240-X and T240-Y witnesses) IIR
 6x 
  6011   Fri Nov 25 22:11:12 2011 MirkoUpdateCDSBeware of fancy filter modules[Rana, Den, Mirko]
It seems you can shoot yourself in
the foot if your filter modules are too complex.
 ChebyTST3.pngCheby.pngCoherenceCheby.pdfChebyAt16kHzBlackand2kHzRed.png 
  6013   Sat Nov 26 02:05:43 2011 MirkoUpdateCDSBeware of fancy filter modules 
We replaced the complicated Cheby
filter module with three separate filter
  
  6017   Sat Nov 26 10:55:40 2011 ranaUpdateCDSBeware of fancy filter modules 
 Could be that what we're seeing
is the noise floor of the Direct Form II
  
  6030   Mon Nov 28 19:24:51 2011 JenneUpdateCDSBeware of fancy filter modules[Rana, Jenne]
Some of the funniness is some kind
of mysterious interaction between 2 filter
 SUSPOS_ETMY_30and0_measured_vs_idealTF.pdfSUSPOS_ETMY_Cheby_measured_vs_idealTF.pdfSUSPOS_ETMY_30and0andCheby_measured_vs_idealTF.pdfSUSPOS_ETMY_30and0andCheby_compareCoherence.pdfSUSPOS_ETMY_30and0andCheby_compareCoherence.pdf 
  6031   Mon Nov 28 22:09:24 2011 ranaUpdateCDSBeware of fancy filter modulesTo see what might be causing the problem,
I used a version of the filter noise test
matlab code that Matt had in the elog.
 noise.pdf 
  3671   Thu Oct 7 16:21:02 2010 KojiOmnistructureCDSBig 3Both Rolf and Alex (at least his elbow)
together visited the 40m to talk with Joe
for the CDS.
 IMG_3642.jpg 
  4984   Mon Jul 18 20:59:19 2011 JenneUpdateLSCBig ol' mess[Jamie, Jenne]
We decided to take on the deceptively
easy-sounding task of checking that the LSC
  
  4988   Tue Jul 19 10:18:24 2011 ranaUpdateLSCBig ol' messRemember, as per our
marker board conversation, that the resistor
noise as excitation method only works if
  
  12059   Fri Apr 1 13:11:26 2016 ericqUpdateWienerFilteringBilinear Noise TestingI've been banging my head against bilinear
noise subtraction, and figured I needed to
test things on some real hardware to see
 bilinear_drive.pdf40m_bilin.pdf 
  13167   Fri Aug 4 18:25:15 2017 gautamUpdateGeneralBilinear noise coupling[Nikhil, gautam]

 bilinearTest.pdf 
  13169   Mon Aug 7 16:00:41 2017 ranaUpdateGeneralBilinear noise couplingThese are not the angular test
parameters that we're looking for:

 recall that what we want
  
  4754   Fri May 20 03:29:04 2011 kiwamuUpdateCDSBinary IO box on 1X5 : LEDs off[Steve / Kiwamu]
 When Steve was working on the
strain reliefs on 1X5 he found that 
 DSC_3050_small.jpg 
  3534   Tue Sep 7 15:31:28 2010 josephb, alexUpdateCDSBinary Output working/ IO chassis fixedAs noted previously,
we were having problems with getting multiple
32 channel binary output cards working. 
  
  12652   Wed Nov 30 17:08:56 2016 gautamUpdateLSCBinary output breakout box removed[ericq, gautam]

To diagnose the glitches in OSEM
readouts, we
  
  12653   Thu Dec 1 02:19:13 2016 gautamUpdateLSCBinary output breakout box restoredAs we suspected, the binary breakout board
(D080478, no drawing available) is simply
a bunch of tracks printed on the PCB to route
 MC1_glitch_fast.pngITMY_testerGlitch.pngITMYsatbox.pngULcomparison.pdf 
  6564   Tue Apr 24 22:16:59 2012 DenUpdatePEMBlue Bird Pre-Amplifier I detached Clyde (pre-amp that was
in the control room) to understand why it
is not working. I seems that the board circuit
 DSC_4273.JPGDSC_4274.JPG 
  6566   Wed Apr 25 11:45:34 2012 JenneUpdatePEMBlue Bird Pre-AmplifierIt looks like we should change the "R40"
and "R47" diodes.  If you
do it this week, ask Jamie or Koji to check
  
  6567   Wed Apr 25 18:59:47 2012 ranaUpdatePEMBlue Bird Pre-AmplifierUsually R is for resistors and D is for
diodes. Do you think from the schematic that
we should put diodes into the R slots? 
  
  6568   Wed Apr 25 19:32:57 2012 DenUpdatePEMBlue Bird Pre-Amplifier

    

       
            
  
  6572   Thu Apr 26 11:56:10 2012 DenUpdatePEMBlue Bird Pre-Amplifier

    

       
            
  
  3586   Sun Sep 19 18:09:09 2010 ranaConfigurationCamerasBlue IP Camera installed on the PSL table   Untitled.png 
  12221   Tue Jun 28 16:10:49 2016 PrafulUpdateGeneralBluebird MicrophonesFound 1 out of 2 bluebird microphones in
the 40m.
  
  3301   Tue Jul 27 18:42:57 2010 GopalUpdateOptic StacksBode Magnitude Plot and ConcernsI  completed
the frequency domain analysis mentioned previously
 Bode_Mag_MC1_MC3.png 
  3304   Wed Jul 28 01:05:44 2010 ranaUpdateSEIBode Magnitude Plot and Concerns1) Gravity has to be included because the
inverted pendulum effect changes the resonant
frequencies. The deflection from gravity
  
  3306   Wed Jul 28 12:16:03 2010 GopalUpdateSEIBode Magnitude Plot and Concerns

    
        
 Bode_Disp_MC1_MC3_y.png 
  5195   Thu Aug 11 16:09:05 2011 NicoleSummarySUSBode Plot for TT SuspensionAll of my plots have already taken into
account the calibration of the photosensor
(V/mm ratio)
 6x 
  5206   Fri Aug 12 14:15:07 2011 NicoleSummarySUSBode Plot for TT SuspensionHere is my bode plot comparing the flexibly-supported
and rigidly-supported EDCs (both with no
bar)
 EXPrigidvsflex.jpg 
  5208   Fri Aug 12 15:34:16 2011 NicoleSummarySUSBode Plot for TT Suspension

    

       
            
 RIGIDexp_model.jpgflexmodcomp.jpg 
  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 
  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.
  
  1715   Thu Jul 2 16:45:06 2009 ClaraUpdatePEMBonnie and Clyde are officially in operation! (Butch Cassidy and the Sundance Kid are in temp position)I hooked up Bonnie and Clyde last night
and tested it today. First I tried some loud
noises to make sure I could identify them
 bonnie_test_marked.pngbonnie_test2_marked.pngbonniebutch_2sbeat_marked.png 
  1726   Wed Jul 8 19:42:37 2009 ClaraUpdatePEMBonnie moved to PSL, getting some coherence with the PMC_ERR channelIn her position overlooking whichever table
it is that is next to the PSL, Bonnie drummed
up some decent coherence with the PSL-PMC_ERR
 DSC_0567.JPGbonnie2_pmcerr.pdfbonnie_PSL.pdf 
  1727   Thu Jul 9 02:18:09 2009 ranaUpdatePEMBonnie moved to PSL, getting some coherence with the PMC_ERR channelMy guess is that we need a different acoustic
strategy. The microphones are mainly for
high frequencies, 
  
  2874   Mon May 3 19:21:43 2010 AlbertoDAQEnvironmentBoot fest[Alberto, Koji, Rana]
The RFM network failed today. We
had to reboot the frame builder anf restart
  
  2519   Sun Jan 17 19:18:55 2010 AlbertoUpdateComputersBoot fest to restart the computer and c1iscey not responding.Thi afternoon I found that the RFM network
in trouble. The frontends sync counters had
railed to 16384 counts and some of the computers
  
  2530   Tue Jan 19 10:30:29 2010 josephbUpdateComputersBoot fest to restart the computer and c1iscey not responding.

    
        
  
  1047   Tue Oct 14 19:18:18 2008 YoichiUpdateComputersBootFestRana, Yoichi

Most of the FE computers failed around the
  
  10088   Mon Jun 23 20:58:38 2014 ericqUpdateCDSBootfest 2014!This afternoon, I wanted to start the nominal
alignment/adjustment steps for evening time
locking, but got sucked into CDS frustrations. 
  
  10090   Tue Jun 24 01:07:56 2014 JenneUpdateLSCBootfest 2014!Still no real luck getting the beam back
aligned to the IFO.
Koji and I tried a few minutes of
 MMT1_face_23June2014_2315pm.png 
  2365   Tue Dec 8 10:20:33 2009 AlbertoDAQComputersBootfest succesfully completedAlberto, Kiwamu, Koji,
this morning we found the RFM network
and all the front-ends down.
  
  16176   Wed Jun 2 17:50:50 2021 PacoUpdateEquipment loanBorrow red cartI borrowed the little red cart 🛒
to help clear the path for new optical tables
in B252 West Bridge. Will return once I am
 IMG_20210602_172858.jpg 
  16180   Thu Jun 3 17:49:46 2021 PacoUpdateEquipment loanBorrow red cartReturned today.




  
  4097   Fri Dec 24 09:01:33 2010 josephbUpdateCDSBorrowed ADCOsamu has borrowed an ADC card from the
LSC IO chassis (which currently has a flaky
generation 2 Host interface board). 
  
  14555   Fri Apr 19 12:06:31 2019 awadeBureaucracyElectronicsBorrowed Busby Box May 19th 2019I've borrowed the Busby Box for a day
or so.  Location: QIL lab at Bridge
West.
  
  17055   Wed Aug 3 15:01:13 2022 KojiUpdateGeneralBorrowed Dsub cables Borrowed DSUB cables for
Juan's SURF project
 PXL_20220803_215819580.jpg 
  14839   Fri Aug 9 20:58:33 2019 JonUpdateElectronicsBorrowed Variac transformerI borrowed an old-looking Variac variable
transformer from the power supplies cabinet
along the y-arm. It is currently in
  
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