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ID Date Author Type Category Subjectup Text Attachments
  9014   Thu Aug 15 12:30:17 2013 manasaUpdateGreen LockingLost beat notes[Koji, Nic, Manasa]
Update from last night.
Koji and I realigned the green optics
  
  27   Mon Oct 29 23:10:05 2007 waldmanConfigurationOMCLost in DAQspace[Pinkesh, Sam]

In setting up a Digital based control of
 SS.pdfSS.gif 
  6097   Fri Dec 9 17:08:41 2011 JenneUpdateRF SystemLots of current used in Rich's demod boxI checked the power regulators on the Rich
demod box (according to the schematic, D1000217). 
  
  6099   Fri Dec 9 17:44:45 2011 KojiUpdateRF SystemLots of current used in Rich's demod boxThose asymmetric currents are same as what
I saw with the table top +/-18V supply. If
you really don't like it, there could be
  
  6101   Fri Dec 9 20:03:57 2011 ZachUpdateRF SystemLots of current used in Rich's demod boxD0902745-v5 (probably
the AP1053's):
 Screen_shot_2011-12-09_at_8.00.54_PM.png 
  7552   Mon Oct 15 22:24:45 2012 JenneUpdateComputersLots of new White :(Evan and I are starting to lock, and there
is lots of new, unfortunate white stuff on
several different screens.
  
  13464   Thu Dec 7 11:14:37 2017 johannesHowToComputer Scripts / ProgramsLots of red on the FE status screenSince we're getting ready to put the
replacement slow DAQ for c1auxex in I wanted
to bring the IFO back to operating condition
 22.png 
  13465   Thu Dec 7 15:02:37 2017 KojiHowToComputer Scripts / ProgramsLots of red on the FE status screenOnce a realtime machine was rebooted, it
did not come back. I suspect that the diskless
hosts have a difficulty to boot up.
 DSC_0552.JPG 
  13466   Thu Dec 7 15:46:31 2017 johannesHowToComputer Scripts / ProgramsLots of red on the FE status screen[Koji, Johannes]

The issue was partially fixed and
the interferometer is in workable condition
 04.png 
  13467   Thu Dec 7 16:28:06 2017 KojiUpdateIOOLots of red on the FE status screenOnce the RT machines were back, we launched
only the five IOPs. They had bunch of red
lights, but we continued to run essential
  
  13474   Thu Dec 14 07:07:09 2017 ranaUpdateIOOLots of red on the FE status screenI had to key the c1psl crate to get the
PMC locking again. Without this, it would
still sort of lock, but it was very hard
  
  4329   Sat Feb 19 01:58:20 2011 ranaSummaryElectronicsLow Noise BJT Pre-AmpFrank put his low noise preamp info here.
I suggest that we build these (using
  
  13291   Tue Sep 5 02:07:49 2017 gautamUpdateLSCLow Noise DRMI attemptSummary:

Tonight, I was able
 MICH_err_comp.pdfdeWhitenedCoil.pdf 
  3040   Wed Jun 2 22:25:39 2010 KevinUpdatePSLLow Power 2W Beam ProfileKoji is worried about thermal lensing introducing
errors to the measurement of the 2W beam
profile so I measured the profile at a lower
 profile_low.png 
  11611   Thu Sep 17 13:06:05 2015 ericqSummaryLSCLow input impedance on CM boardAs it turns out, our version of the common
mode board does not have
high input impedence. I think this is what
  
  14129   Fri Aug 3 15:53:25 2018 gautamUpdateSUSLow noise bias path ideaSummary:

The idea we are going with to push
the coil driver noise contribution down is
 LT1055_precOpAmp.pdf 
  14130   Fri Aug 3 16:27:40 2018 ranaUpdateSUSLow noise bias path ideaBah! Too complex.   
  11226   Mon Apr 20 16:18:29 2015 JenneUpdateElectronicsLow noise pre-amps: returnedThe Rai box was in the Cryo lab, and the
Busby box was in the TCS lab.  Neither
had been signed out.  Lame.  Anyhow,
  
  11228   Mon Apr 20 21:26:46 2015 ranaUpdateElectronicsLow noise pre-amps: returned+1 to both Evan and Zach for prompt info
and +2 to you for getting more stuff than
you started looking for. -2 karma to
  
  11225   Sun Apr 19 15:03:26 2015 JenneUpdateElectronicsLow noise pre-amps?Does anyone know where the Busby
or Rai low noise pre-amp boxes are? 
  
  17310   Thu Nov 24 11:23:35 2022 AnchalUpdateSUSLow noise stateI've turned off HEPA fan and all lights
at
PST: 2022-11-24 11:23:59.509949 PST
  
  17313   Fri Nov 25 15:35:23 2022 AnchalUpdateSUSLow noise stateTurned off HEPA at:

PST: 2022-11-25 15:34:55.683645
PST
  
  4456   Tue Mar 29 15:01:58 2011 Larisa ThorneUpdateElectronicsLow pass filter for X arm laser temperature control This is the continuation of http://nodus.ligo.caltech.edu:8080/40m/4402
 
 DSC_2889.JPGLPFgraph.pdf 
  4457   Tue Mar 29 15:50:21 2011 KojiUpdateElectronicsLow pass filter for X arm laser temperature controlFor bode plot:

USE LOG-LOG plot for the amplitude
  
  4531   Fri Apr 15 13:40:00 2011 Larisa ThorneUpdateElectronicsLow pass filter for X arm laser temperature control, second tryPlotting the data points yielded by the
spec analyzer of my first LPF yielded a result
that was not expected: the desired cutoff
 Bode2.jpegBode100k.jpg 
  14068   Fri Jul 13 18:01:13 2018 gautamUpdateGeneralLow power MCAfter getting the go ahead from Steve,
I removed the physical beam block on the
PSL table, sent the beam into the IFO, and
  
  1346   Mon Mar 2 21:16:32 2009 YoichiUpdateLockingLow-gain High-gain PD switching may not be working wellOsamu, Yoichi

This afternoon, I run the locking script
  
  1350   Tue Mar 3 19:26:44 2009 YoichiUpdateLockingLow-gain High-gain PD switching may not be working wellI checked the switching of the QPDX from high
gain to low gain.
Switching happens as expected, but the low
  
  1351   Tue Mar 3 23:59:26 2009 YoichiUpdateLockingLow-gain High-gain PD switching may not be working well[quote]I checked the switching of the QPDX
from high gain to low gain.
Switching happens as expected, but the low
  
  1352   Wed Mar 4 03:37:51 2009 YoichiUpdateLockingLow-gain High-gain PD switching may not be working well[quote]
This sounds like the QPD whitening gain sliders
may be stuck.  The slider twiddling script
  
  13424   Fri Nov 10 13:46:26 2017 SteveUpdatePEMM3.1 local earthquakeBOOM
SHAKA-LAKA
 3.1M_local_EQ.png 
  15580   Sat Sep 19 01:49:52 2020 KojiUpdateGeneralM4.5 EQ in LAM4.5 EQ in LA 2020-09-19 06:38:46 (UTC)
/ -1d 23:38:46 (PDT) https://earthquake.usgs.gov/earthquakes/eventpage/ci38695658/executive

I only checked the watchdogs. All
  
  15581   Sat Sep 19 11:27:04 2020 ranaUpdateGeneralM4.5 EQ in LAthe seismometers obviously saturated during
the EQ, but the accelerometers captured some
of it. It looks like there's different
 Sep18-EQ.pdf 
  15583   Sat Sep 19 18:08:34 2020 ranaUpdateGeneralM4.5 EQ in LAthe EQ was ~14 km south of Caltech and
17 km deep

  
  14755   Fri Jul 12 07:37:48 2019 gautamUpdateSUSM4.9 EQ in RidgecrestAll suspension watchdogs were tripped ~90mins
ago. I restored the damping. IMC is locked.
 56.pngITMXunstick.pngITMX_UL.pdf 
  13739   Mon Apr 9 08:39:39 2018 SteveUpdatePEMM5.3 eq Souther CAEarth quake M5.3    2018-04-05
19:29:16UTC         
 M5.3_Santa_Cruz_Is.CA.pngafter_M5.3.pngM5.3vac.png 
  13302   Fri Sep 8 07:54:04 2017 SteveUpdatePEMM8.1 eqNothing tripped. No obvious damage.  M8.1.png 
  11572   Fri Sep 4 04:12:05 2015 ericqUpdateComputer Scripts / ProgramsMATLAB down on all workstationsThere seems to be something funny going
on with MATLAB's license authentication
on the control room workstations. Earlier
  
  320   Fri Feb 15 22:16:04 2008 AndreyUpdateComputersMATLAB is not working: "Licence checkout failed"
For some unknown to me reason, 
  
  15207   Tue Feb 11 19:11:35 2020 shrutiUpdateComputer Scripts / ProgramsMATLAB on donatellaTried to open MATLAB on Donatella and found
the error:


MATLAB is selecting
  
  6294   Sat Feb 18 12:23:09 2012 DenUpdateIOOMC When I came to the 40m this afternoon,
the MC was unlocked. Here is the trend of
MC_F for last 2 hours
 mc_trend.png 
  8343   Mon Mar 25 23:17:11 2013 ranaSummaryIOOMC I measured the dark noise and regular intensity
noise in MC trans tonight to get some estimate
for the free running spectrum that the Chas
 MC-trans.pdf 
  9211   Sun Oct 6 23:50:14 2013 ranaConfigurationSUSMC filters adjusted
    Found the low pass filters OFF
in a couple of the MC SUS damping loops.
This allows injection of OSEM noise all the
  
  9697   Thu Mar 6 09:47:11 2014 SteveUpdateIOOMC trend of 20 days

    

       
            
 IOO_20days.png 
  10225   Thu Jul 17 01:24:35 2014 ranaUpdateIOOMC / EOM Stability Mystery Solved!MC loop is near
unstable. Common gain reduced. Needs more
 MC_OLG.pdf 
  5167   Wed Aug 10 11:22:55 2011 SureshUpdateIOOMC A2L alignment[Kiwamu, Suresh]
We attempted to minimise the A2L
coupling in the MC mirrors (centering the
  
  9205   Sun Oct 6 17:05:49 2013 ranaSummaryIOOMC ASC problemsMC unlocked over the weekend and also got
severely mis-aligned. It all started around
midnight on Saturday.
 mcasc.pdf 
  7289   Mon Aug 27 18:59:24 2012 jamieUpdateIOOMC ASC screen was confusing - Jenne is not stupid

    

       
            
 Screenshot-1.pngScreenshot-2.png 
  357   Tue Mar 4 20:14:02 2008 ranaConfigurationIOOMC AlignmentThe MC alignment was pretty far off. We were
getting TEM01 mode locks only. 
Rather than inspect what happened I just
  
  1166   Tue Dec 2 17:56:56 2008 Alberto, RanaConfigurationPSLMC AlignmentIn the attempt to maximize the Mode Cleaner
transmission and minimize the reflection
from the steering mirrors of the MC periscope,
  
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