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ID Date Author Type Category Subjectup Text Attachments
  3617   Tue Sep 28 21:11:52 2010 koji, taraUpdateElectronicsFixing the new TTFSSWe
found a small PCB defect which is an excess
copper shorting circuit on the daughter board,
 before.jpgafter.jpgbefore.jpgafter.jpg 
  3811   Thu Oct 28 16:38:54 2010 josephbUpdateCDSFlaky fb, reverted inittab changes on fbProblem:
Yuta reported many of the signals
being displayed by dataviewer "fuzzier"
  
  3814   Thu Oct 28 21:20:11 2010 yutaUpdateCDSFlaky fb, tried DAQ re-install, but no helpSummary:
  Unfortunately, fb is flakier
than normal. 
  
  16003   Wed Apr 7 02:50:49 2021 KojiUpdateSUSFlange InspectionsBasically I went around all the chambers
and all the DB25 flanges to check the invac
cable configurations. Also took more time
  
  16404   Thu Oct 14 18:30:23 2021 KojiSummaryVACFlange/Cable Stand ConfigurationFlange Configuration for BHD

We will need total 5 new
cable stands. So Qty.6 is the number to be
 40m_flange_layout_20211014.pdf 
  6196   Fri Jan 13 16:16:05 2012 Leo SingerUpdateStewart platformFlexure type for leg jointsI had been thinking of using this
flexure for the bearings for the
leg joints, but I finally realized that it
  
  257   Wed Jan 23 20:52:40 2008 ranaSummaryEnvironmentFlooding from construction areaWe noticed tonight around 7 PM that [B]there
was a lot of brown water in the control room
and also in the interferometer area[/B] mostly
 Shop-Vac_Action.MOVFlooding.pdf 
  9246   Wed Oct 16 10:32:40 2013 SteveUpdateSUSFlowbench effect on oplev error signals ETMX _OPLEV_...ERROR signals are
effected by turning ON the  
 FlowBenchOnOff.png 
  5951   Fri Nov 18 19:07:07 2011 JenneUpdateRF SystemFoam house on EOM[Jenne, Zach, Frank]
Frank helped Zach and I cable up
at PT-100 RTD, and make sure it worked with
  
  5954   Sat Nov 19 00:09:02 2011 ZachUpdateRF SystemFoam house on EOM

    

       
            
  
  6104   Mon Dec 12 11:16:02 2011 JenneUpdateRF SystemFoam house on EOMFoam house installed on EOM a few min ago. 
We'll leave it until ~tomorrow, then try
out the heater loop.
  
  5242   Mon Aug 15 17:38:07 2011 jamieUpdateGeneralFoil aperture placed in front of ETMYWe have placed a foil aperture in front
of ETMY, to aid in aligning the Y-arm, and
then the PRC.  It obviously needs to
  
  15022   Wed Nov 13 19:34:45 2019 gautamUpdatePEMFollow-up on seismometer discussionAttachment
#1 shows the spectra
 seisAll_20191111.pdfffPotential.pdf 
  15023   Wed Nov 13 20:15:56 2019 ranaUpdatePEMFollow-up on seismometer discussionthis
is due to the Equivalence Principle: local
  
  15024   Wed Nov 13 23:40:15 2019 gautamUpdatePEMFollow-up on seismometer discussionHere is some disturbance
in the spacetime curvature, where the local
 seisAll_20191111_1Hz.pdf 
  15025   Thu Nov 14 12:11:04 2019 ranaUpdatePEMFollow-up on seismometer discussionat 1 Hz' this effect is not large so
that's real translation. at lower frequencies
a ground tilt couples to the horizontal sensors
  
  15027   Fri Nov 15 00:18:41 2019 ranaUpdatePEMFollow-up on seismometer discussionThe large ground motion at 1 Hz started
up again tonight at around 23:30. I walked
around the lab and nearby buildings with
 MCshake.pdf 
  15030   Fri Nov 15 12:16:48 2019 gautamUpdatePEMFollow-up on seismometer discussionAttachment
#1 is a spectrogram
 BS_ZspecGram.pdf.zip 
  15032   Mon Nov 18 14:32:53 2019 gautamUpdatePEMFollow-up on seismometer discussionThe nightly seismic activity enhancement
continued during the weekend. It always shows
up around 10pm local time, persists for ~1
  
  15036   Tue Nov 19 21:53:57 2019 gautamUpdatePEMFollow-up on seismometer discussionThe shaking started earlier today than
yesterday, at ~9pm local time.

While the IFO is shaking, I thought
 seisxSpec.pdf 
  15417   Fri Jun 19 14:03:50 2020 JordanUpdateVACForepump Tip Seal ReplacementTip Seals were replaced on the forepumps
for TP2 and TP3, and both are ready to be
installed back onto the forelines.
  
  7348   Thu Sep 6 10:57:27 2012 JenneUpdateGeneralForgot to turn green refl pd back on

    

       
            
  
  5793   Thu Nov 3 13:00:52 2011 JenneUpdatePhotosFormatting of MEDM screen names

    

       
            
  
  6041   Tue Nov 29 18:31:40 2011 DenUpdatedigital noiseFoton error In the previous elog we've compared
Matlab and Foton SOS representations using
low-order filter. Now we move on to high
  
  6061   Thu Dec 1 18:30:39 2011 Vladimir, DenUpdatedigital noiseFoton errorFoton Matlab Error 
   
We investigated
some more the discrepancy between Matlab
  
  6062   Fri Dec 2 17:43:46 2011 ranaUpdatedigital noiseFoton errorIt would be useful to see some plots so
we could figure out exactly what magnitude
and phase error correspond to "gross"
  
  15287   Tue Mar 31 09:39:41 2020 gautamUpdateCDSFoton for shaped noise injectionsI'd like to re-measure the transfer
function from driving MC2 position to the
MC_L_DQ channel (for feedforward purposes).
  
  15288   Tue Mar 31 23:35:50 2020 ranaUpdateCDSFoton for shaped noise injectionsdo you really mean awggui cannot make shaped
noise injections via its foton text box ?
That has always worked for me in the past.
  
  15289   Tue Mar 31 23:54:57 2020 gautamUpdateCDSFoton for shaped noise injectionsThe problem is that foton does not inherit
the model sample rate when launched from
DTT/awggui. This is likely some shared/linked/dynamic
  
  3659   Wed Oct 6 12:00:23 2010 josephb, yuta, kiwamuUpdateCDSFound and fixed filter sampling rate problem with suspensionsWhile we looking using dtt and going over
the basics of its operation, we discovered
that the filter sample rates for the suspensions
  
  14500   Fri Mar 29 11:43:15 2019 JonUpdateUpgradeFound c1susaux database bugI found the current bias output channels,
C1:SUS-<OPTIC>_<DOF>BiasAdj,
were all pointed at C1:SUS-<OPTIC>_
  
  8653   Thu May 30 01:02:41 2013 ManasaUpdateGreen LockingFound it!X green beat note
found!
 IMG_0598.JPGIMG_0599.JPG 
  4980   Sun Jul 17 18:23:23 2011 JenneUpdatePSLFound the PMC unlockedIt was unlocked since ~4:30am.  No
idea why.  It's relocked so I can try
round N of measuring the PRC length.
 PMCunlocked_17July2011.png 
  3755   Thu Oct 21 18:45:50 2010 KojiUpdatePSLFound the beat at 1064nm[Koji Suresh]
We found the beat at 1064nm. T(PSL)=26.59deg,
  
  3756   Thu Oct 21 19:10:39 2010 AidanUpdatePSLFound the beat at 1064nm    
  3759   Fri Oct 22 01:23:13 2010 KojiUpdatePSLFound the beat at 1064nm[Koji / Suresh]
We worked on the 1064 beating a bit
more.
 101021_beat.pdf 
  8913   Tue Jul 23 21:32:43 2013 KojiUpdateIOOFound the cause of mysterious MC motionThesedays
we were continuously annoyed by unELOGGED
activities of the interferometer.
  
  8917   Wed Jul 24 14:26:24 2013 ranaUpdateIOOFound the cause of mysterious MC motionYes, this was not ELOG'd by me, unfortunately.
This was the MC tickler which I described
to some people in the control room when I
  
  9046   Wed Aug 21 19:26:19 2013 ranaUpdateIOOFound the cause of mysterious MC motion

    

       
            
  
  6160   Tue Jan 3 17:25:27 2012 KojiUpdatePSLFound the laser was offI found the PSL laser has been off for
four hours. Nobody seemed to know why.
I just turned it on and it is now
  
  6582   Mon Apr 30 13:00:50 2012 SureshUpdateCDSFrame Builder is downFrame builder is down.  PRM has tripped
its watch dogs.  I have reset the watch
dog on PRM and turned on the OPLEV. It has
  
  6583   Mon Apr 30 13:58:25 2012 JamieUpdateCDSFrame Builder is down

    

       
            
  
  6584   Mon Apr 30 16:56:05 2012 SureshUpdateCDSFrame Builder is down

    

       
            
  
  6586   Mon Apr 30 20:43:33 2012 SureshUpdateCDSFrame Builder is down

    

       
            
  
  6591   Tue May 1 08:18:50 2012 JamieUpdateCDSFrame Builder is down

    

       
            
  
  10600   Mon Oct 13 16:08:49 2014 JenneUpdateCDSFrame builder is madI think the daqd process isn't running
on the frame builder. 
 Daqd_problem_maybe.png 
  10601   Mon Oct 13 16:57:26 2014 KojiUpdateCDSFrame builder is madCPU load seems extremely high. You need
to reboot it, I think
controls@fb /proc 0$ cat loadavg
  
  10602   Mon Oct 13 17:09:38 2014 ericqUpdateCDSFrame builder is mad 
This CPU load may have been me deleting
some old frame files, to see if that would
  
  4510   Mon Apr 11 14:17:22 2011 josephb, jamieUpdateCDSFrame wiper script installed[Joe, Jamie, Alex]
Fixes:
I
asked Alex which cron to use (dcron? frcron?). 
  
  4109   Wed Jan 5 00:23:30 2011 ranaSummaryDAQFrameBuilder fails in a new waySince Leo was trying to demo his LIGO Data
Listener code, he noticed that there was
and NDS2 issue. The NDS2 guy (JZ) noticed
  
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