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  40m Log, Page 28 of 344  Not logged in ELOG logo
ID Date Author Type Category Subjectup Text Attachments
  6391   Fri Mar 9 11:02:56 2012 Ryan FisherSummaryComputer Scripts / ProgramsAlterations to base epics install for installing aLIGO conlog:[H1]Too Many Fast Changing EPICS in New Conlog[/H1]
I have been monitoring the new conlog, and
it already has far too many rows.
  
  6394   Fri Mar 9 15:48:56 2012 Ryan FisherSummaryComputer Scripts / ProgramsAlterations to base epics install for installing aLIGO conlog:[SIZE=1]
I decided to make a backup of the database
and then delete it and make a new database:
  
  6396   Fri Mar 9 16:28:10 2012 Ryan FisherSummaryComputer Scripts / ProgramsAlterations to base epics install for installing aLIGO conlog:I created a page on the wiki for the new EPICS
log (conlog):
https://wiki-40m.ligo.caltech.edu/aLIGO%20EPICs%20log%20%28conlog%29
  
  7001   Mon Jul 23 07:39:55 2012 Ryan FisherSummaryComputer Scripts / ProgramsAlterations to base epics install for installing aLIGO conlog:Note:  The Conlog install instructions that
I started from were located here:
https://awiki.ligo-wa.caltech.edu/aLIGO/Conlog
  
  8185   Wed Feb 27 14:59:01 2013 EvanUpdate Altered MC demodulation phase I took out a short (~12 cm) SMA cable
from the "LO input" path into the
MC demod board in an attempt to maximize
 Q_and_I_before.epsQ_and_I_after.eps 
  14544   Mon Apr 15 22:39:10 2019 gautamUpdateFrequency noise measurementAlternate setup with PSL pickoff[anjali, gautam]

just main points, anajli is going
to fill out the details.
  
  12834   Thu Feb 16 13:29:38 2017 gautamSummaryGeneralAlternative Calibration SchemeSummary:

Craig and I have been trying to
put together a Simulink diagram of the proposed
 AltCal.pdf 
  12835   Thu Feb 16 21:55:47 2017 ranaSummaryGeneralAlternative Calibration SchemeQuestion for Craig: What does the SNR of
our lines have to be? IF we're only trying
to calibrate the actuator in the audio band
  
  12842   Tue Feb 21 13:51:35 2017 CraigSummaryGeneralAlternative Calibration SchemeWe get SNR in two ways: the amplitude of
applied force and the integration time. 
So we are limited in two ways: stability
  
  12845   Wed Feb 22 10:16:54 2017 ranaSummaryGeneralAlternative Calibration SchemeOK, but the questions still stands: "   
  11981   Mon Feb 8 15:36:37 2016 gautamUpdateGreen LockingAlternative mode-matching schemeI looked in the optics cabinet to see what
lenses we have available, and re-ran the
mode-matching calculation to see if we could
 Modematch_alternative.pdf 
  3981   Tue Nov 23 22:45:59 2010 kiwamuUpdateComputersAltiumI installed
and activated Altium, a PCB design software,
  
  1476   Sun Apr 12 19:31:43 2009 ranaSummaryElectronicsAmphony 2500 HeadphonesWe bought the Amphony 2500 Digital Wireless
headphones recently. The other cheapo headphones
we have are OK for control room use, but
  
  14482   Sun Mar 17 21:06:17 2019 AnjaliUpdateALSAmplifier characterisationThe goal was to characterise the new amplifier
(AP1053). For a practice, I did the characterisation
of the old amplifier.This test is similar
 Gain_measurement.pdfAmplifier_gain.pdfnoise_measurement.pdfnoise_characterisation.pdf 
  9991   Sat May 24 22:56:57 2014 JenneUpdateElectronicsAmplifier removed from BeatX pathI just realized that I forgot to elog this,
but yesterday afternoon I bypassed the amplifier
in the BeatX path, and now the X beatnote
  
  9992   Mon May 26 07:59:23 2014 KojiUpdateElectronicsAmplifier removed from BeatX pathAnd the out-of-loop level of the ALSX compared
with the previous measurement is ...?

  
  9995   Tue May 27 11:58:45 2014 JenneUpdateElectronicsAmplifier removed from BeatX pathSorry, I had been in a hurry when I worked
on this last week, and again when I wrote
the elog, but I wanted to at least put in
 ALS_outofloop_27May2013.pdf 
  5156   Tue Aug 9 16:00:58 2011 JennyUpdatePSLAmplitude response of PZT   AMresponsePZT.pngAMresponsePZT.png 
  15457   Mon Jul 6 17:41:19 2020 gautamUpdateLSCAn LSC puzzlerLast Tuesday evening, while attempting
the PRFPMI locking, I noticed a strange feature
in the LSC signals, which is shown in 
 LSCsignals.jpg 
  10093   Tue Jun 24 16:52:43 2014 NichinUpdateElectronicsAn RF cable re-installed

    

       
            
  
  10667   Tue Nov 4 19:17:53 2014 ericqUpdateComputer Scripts / ProgramsAnaconda + CDSutilsI've fallen down the rabbit hole of trying
to reconcile our desire for newer versions
of the Numpy and Scipy python packages with
  
  10688   Sat Nov 8 11:31:51 2014 ranaUpdateComputer Scripts / ProgramsAnaconda + CDSutils

    

       
            
  
  14923   Wed Oct 2 10:50:20 2019 gautamUpdateCDSAnaconda updatedThe anaconda distribution used by the control
room workstations is actually installed on
the shared drive (/cvs/cds/ligo/apps/anaconda/)
  
  4254   Sat Feb 5 23:03:04 2011 rana, kojiSummaryElectronicsAnalog Frequency Discriminator: splitter + mixer + long cableThis diagram shows the setup  mixer.pdfUntitled.pngfsm.png 
  4255   Sun Feb 6 02:29:28 2011 ranaUpdateElectronicsAnalog MFD: longer cableI swapped over to a 3x longer cable (old
65 ft. Pasternak cable from ancient 40m days).
The old one was 6m, the new one is 18.2 m.
 mfd18.png 
  9810   Tue Apr 15 02:19:54 2014 JenneUpdateLSCAnalog phasing of REFL11 and REFL55[Jenne, EricQ]
I told Koji that I wanted to play
with the common mode servo this evening,
  
  9811   Tue Apr 15 02:26:45 2014 ericqUpdateLSCAnalog phasing of REFL11 and REFL55For future reference:
As we were poking around with the
common mode servo in an FPMI configuration,
  
  9812   Tue Apr 15 08:55:57 2014 KojiUpdateLSCAnalog phasing of REFL11 and REFL55I have never used such a long cable for
RF phase adjustment. The speed of the signal
is 2e8 m/s and the frequency is ~10e6 Hz.
  
  14348   Wed Dec 12 18:27:07 2018 JonOmnistructureUpgradeAnalog signals, A/D Acromag added to vacuum systemThere turned out to be a few analog signals
for the vacuum system after all. The TP2/3
foreline pressure gauges were never part
  
  8375   Fri Mar 29 19:23:49 2013 Gabriele, JenneFrogsLSCAnalog whitening filter of REFL55 not switchingWe discovered that the analog whitening
filter of the REFL55_I board is not switching
when we operate the button on the user interface.
  
  8377   Fri Mar 29 19:58:24 2013 Gabriele, JenneFrogsLSCAnalog whitening filter of REFL55 not switching

    

       
            
  
  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 
  2559   Tue Feb 2 13:14:09 2010 KojiHowToIOOAnatomy of New Focus Resonant EOMJoe let me use the resonant EOM for GigE
phase camera for a while.
Then, I immediately started to open
  
  161   Mon Dec 3 19:44:58 2007 Accelerometers on new mountsConfigurationPEMAndrey
I (Andrey) continued today working with new
accelerometer mounting. (see entry #151 about
 DSC_0194.JPGDSC_0195.JPGDSC_0196.JPG 
  53   Thu Nov 1 19:55:03 2007 Andrey RodionovBureaucracyPhotosAndrey's photo   DSC_0055.JPG 
  515   Tue Jun 3 12:33:36 2008 AndreyUpdateCamerasAndrey, Josephb
Continuing our work with cameras,
  
  54   Thu Nov 1 19:55:59 2007 Andrey RodionovBureaucracyPhotosAndrey, Tobin, Robert - photo   DSC_0092.JPG 
  8887   Mon Jul 22 03:10:41 2013 ranaSummaryloreAngel of the Y End Table? Trying to take an image or movie
of the ETMY Transmon cam, we got instead
this attached image.
 asdasd.jpg 
  8888   Mon Jul 22 06:58:17 2013 LisaSummaryloreAngel of the Y End Table?

    

       
            
 image.jpg 
  11206   Tue Apr 7 04:21:45 2015 ericqUpdateASCAngular Control during Locking[J, Q]

Alignment is making it tough for
locks to last more than 10 minutes. Many
  
  16125   Thu May 6 16:13:39 2021 AnchalSummaryIMCAngular actuation calibration for IMC mirrorsHere's my first attempt at doing angular
actuation calibration for IMC mirrors using
the method descibed in /users/OLD/kakeru/oplev_calibration/oplev.pdf
 IMC_Ang_Act_Cal_Kakeru_Tests.pdf 
  8489   Thu Apr 25 03:35:28 2013 JenneUpdateLockingAngular motion does not explain RINDen made a nice elog about the PRMI RIN
that we see a few weeks ago:  8464. 
The RIN that we're seeing is typically about
 RIN_estimation_from_angular_motion.nb.zip 
  890   Wed Aug 27 10:55:35 2008 YoichiHowToComputersAnnoying behavior of the touch pads of the lab. laptops is fixedI was sick of the stupid touch pad behavior
of the lab. laptops, i.e. firefox goes back
and forth in the history when the cursor
  
  13919   Wed Jun 6 10:44:52 2018 gautamUpdateVACAnnulus pressure channels added to frames[steve,
gautam]

We added the following channels
 AnsPressureLogged.png 
  11477   Mon Aug 3 18:19:09 2015 JessicaUpdateGeneralAnodization of front panels accounted forPreviously, I had gotten the same results
for the conductive and the isolated front
panels. Today, I sanded off the anodized
 redo_conduct1X.pngredo_conduct1Y.png 
  14768   Wed Jul 17 20:12:26 2019 KruthiUpdateCamerasAnother GigE in place of analog cameraI've taken the MC2 analog  zoomed_out_gige.pngosems_mc2.pngMC2.pdf 
  14727   Fri Jul 5 20:57:04 2019 KojiUpdateSUSAnother M7.1 EQ[Kruthi, Koji]

Koji came to the lab to align the
IMC/IFO, but found the mirrors are dancing
 Screenshot_from_2019-07-05_21-03-06.png 
  14728   Fri Jul 5 21:53:10 2019 KojiUpdateSUSAnother M7.1 EQ- ITM
unstuck now
- IMC briefly locked at TEM00
  
  14729   Fri Jul 5 22:21:13 2019 KojiUpdateSUSAnother M7.1 EQIn fact, ETMX was not stuck until the M7.1
EQ today. After that it got stuck, but during
the after shocks, all the OSEMs occasionally
 Screenshot_from_2019-07-05_22-19-57.png 
  584   Fri Jun 27 18:03:46 2008 JenneUpdateElectronicsAnother bad cable in the MC servoEric was helping me to measure the response
of the LO input on the MC's Demod board,
and when we disconnected the end of the cable
  
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