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ID Date Author Typedown Category Subject Text Attachments
  1468   Fri Apr 10 03:10:08 2009 ranaSummaryLockingLaser PM to REFL-DC transfer functions at multiple CARM offsetsI hereby award the previous rainbow transfer
functions the plot innovation of the month
award for its use of optical frequency to
  
  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
  
  1500   Mon Apr 20 18:17:44 2009 robSummaryLockingCARM offset/Power rubricPlotted assuming the average arm power
goes up to ~80.  No DARM offset.
 ARMpowersCARM.png 
  1505   Mon Apr 20 23:27:59 2009 ranaSummaryVACc1vac2 rebooted: non-functional for several monthsWe found several problems with the framebuilder
tonight. The first symptom was that it was
totally out of
  
  1510   Thu Apr 23 16:35:23 2009 YoichiSummaryComputer Scripts / ProgramsrestoreWatchdog scriptWhen the IFO loses lock during the lock acquisition
steps, it often kicks the MC2 (through the
CM servo) and trips the watchdog.
  
  1513   Thu Apr 23 21:13:37 2009 YoichiSummaryEnvironmentMag. 4 earthquake in LA tripped the watchdogs of the most optics So far, no damage is noticeable.
restoreWatchdog script was useful :-)
  
  1538   Fri May 1 18:24:36 2009 AlbertoSummaryGeneraljitter of REFL beam ?Some loud thinking.
 
For
the measurement of the length of the PRC,
I installed a fast photodiode in the path
  
  1539   Fri May 1 18:51:34 2009 AlbertoSummaryEnvironmentearthquakeEarthquake 4.4 Leo Carrillo Beach.
Some of the watchdogs tripped out.
  
  1552   Wed May 6 19:04:11 2009 ranaSummaryVACvac imagesSince there's no documentation on this besides
Steve's paper notebooks...
 vacrack.pdf 
  1563   Fri May 8 04:46:01 2009 rana, yoichiSummaryoplevsBS/PRM/SRM table bad!We went to center the oplevs because they
were far off and found that (as usual) the
numbers changed
 a.png 
  1579   Wed May 13 02:53:12 2009 robSummaryloreChannel Hopping: That ancient enemy (MC problems)We were stymied tonight by a problem which
began late this afternoon.  The MC would
periodically go angularly unstable, breaking
  
  1582   Wed May 13 14:43:29 2009 robSummaryloreChannel Hopping: That ancient enemy (MC problems)


   
        
            
 MC3sidemon.png 
  1583   Wed May 13 21:15:04 2009 ranaSummarySUSChannel Hopping: That ancient enemy (MC problems)The MC side problem could also be the side
tramp unit problem. Set the tramp to 0 and
see if that helps.
  
  1584   Thu May 14 00:15:39 2009 robSummarySUSChannel Hopping: That ancient enemy (MC problems)[quote]The MC side problem could also be the
side tramp unit problem. Set the tramp to
0 and see if that helps.[/quote]
 sidemon.png 
  1586   Thu May 14 15:28:28 2009 steveSummarySUSApril 24 earthquake effect on MC2[quote][quote]The MC side problem could also
be the side tramp unit problem. Set the tramp
to 0 and see if that helps.[/quote]
 eq042409.jpg 
  1587   Thu May 14 16:07:20 2009 peteSummarySUSChannel Hopping: That ancient enemy (MC problems)[quote][quote]The MC side problem could also
be the side tramp unit problem. Set the tramp
to 0 and see if that helps.[/quote]
 mc3_5days.jpg 
  1598   Mon May 18 02:18:17 2009 ranaSummarySEIUsing STACIS w/ a good position sensor[FONT=Verdana]WE turned off STACIS a few years
ago because we noticed that it was causing
noise below a few Hz and making
 stacis40.png 
  1608   Tue May 19 16:08:03 2009 ranaSummarySEIEUCLIDFrom Stuart Aston, I've attached a picture
of the EUCLID position sensor:
 Picture_6.png 
  1618   Thu May 21 18:21:57 2009 ranaSummaryTreasureYoichi's words    
  1638   Mon Jun 1 14:49:07 2009 robSummaryPSLpsl thoughtsSome thoughts on what happened with the
MOPA cooling.  
Some unknown thing happened to precipitate
  
  1685   Thu Jun 18 23:20:40 2009 robSummaryLSCI-Q ratio with RF detected DARMThis is a ratio of PD1_I to PD1_Q (so a
ratio of the two quadratures of AS166), measured
in an anti-spring state.  It's not flat
 IQratio.jpg 
  1717   Tue Jul 7 15:08:49 2009 KojiSummaryPhotos40 high school students visited 40MAlan and Alberto conducted a tour of 40
high-school students.
It may be the same tour that Rana
 IMG_1848.jpg 
  1795   Mon Jul 27 09:34:07 2009 steveSummaryIOOAligning the mode cleaner


   
        
            
 20dtrend.jpg 
  1796   Mon Jul 27 14:12:14 2009 ranaSummarySUSTM Coil Noise SpectraRob noticed that the ITMY DAC channels were
saturating occassionally. Looking at the
spectrum we can see why.
 Coils.pdf 
  1864   Fri Aug 7 19:34:40 2009 steveSummaryVACUPS failedThe Maglev is running on single phase 220V
and that voltage  was not interrupted.
TP1 was running undisturbed with V1 and V4
  
  1865   Fri Aug 7 19:55:08 2009 steveSummaryVACopening V1 when PTP1 is brokenThe swapped in 307 convectron gauge controller 
is very likely to have the  RS232 connection 
wired differently from the old one.
  
  1874   Mon Aug 10 15:24:17 2009 robSummaryPSLMZ badI think the MZ pzt is broken/failing. 
I'm not sure how else to explain this behavior.
The first bit of the time series
 brokenMZpzt.png 
  1875   Mon Aug 10 15:56:12 2009 robSummaryPSLMZ bad redux


   
        
            
 badMZtrans.png 
  1887   Tue Aug 11 23:17:21 2009 ranaSummaryComputersNodus rebooted / SVN downLooks like someone rebooted nodus at ~3
PM today but did not elog it. Also the SVN
is not running. Why?
  
  1888   Tue Aug 11 23:55:04 2009 rana, richSummaryOMCQuantum Efficiency and Dark Current measurements of eLIGO PhotodiodesRich Abbott, Rana
Summary: We found that the 3mm
InGaAs photodiodes from eGTRAN which are
 IMG_0135.png 
  1890   Wed Aug 12 10:35:17 2009 jenneSummaryComputersNodus rebooted / SVN down


   
        
            
  
  1902   Fri Aug 14 14:19:25 2009 KojiSummaryComputersnodus rebootednodus was rebooted by Alex at Fri Aug 14
13:53. I launched elogd.
cd /export/elog/elog-2.7.5/
  
  1903   Fri Aug 14 14:33:51 2009 JenneSummaryComputersnodus rebooted


   
        
            
  
  1904   Fri Aug 14 15:20:42 2009 josephbSummaryComputersLinux1 now has 1.5 TB raid drive


   
        
            
  
  1916   Mon Aug 17 02:12:53 2009 YoichiSummaryComputersFE bootfestRana, Yoichi

All the FE computers went red this evening.
  
  1919   Mon Aug 17 09:52:04 2009 robSummaryGeneralconlogger restartedI restarted the conlogger on op340m. 
This needs to be done when op340m is rebooted--it
wasn't done for some reason and so we've
  
  1920   Mon Aug 17 17:43:11 2009 ranaSummaryGeneralconlogger restartedAdded the conlog directory to the SVN,
minus the enormous data directory. We are
now free to make changes to the conlog code.
  
  1921   Mon Aug 17 17:48:49 2009 robSummaryGeneralconlogger restarted


   
        
            
  
  1923   Tue Aug 18 14:24:43 2009 YoichiSummaryPSLReference Cavity InspectionRana, Koji, Yoichi

To see why the reflected beam from the RC
  
  1933   Fri Aug 21 17:28:50 2009 Kevin, ranaSummaryPEMMagnetic Field Measurements Around the Lab


 AC-field.pngDC-field.png 
  1934   Fri Aug 21 17:49:47 2009 YoichiSummaryComputersUpgrade FE conceptual planI started to draw a conceptual diagram of
the upgraded FE system.
http://nodus.ligo.caltech.edu:30888/FE/FE-Layout.html
 Picture_2.png 
  1941   Tue Aug 25 03:30:23 2009 YoichiSummaryWIKI-40M UpdateGreen lock and phase noiseWhile Koji and I were discussing about the
green laser lock, we wondered if the common
motion of the cavity mirrors,
 PhaseNoise.png 
  1942   Tue Aug 25 11:02:39 2009 ranaSummaryPSLTemperature BoxThe PSL Temperature Box (D980400-B-C, what
kind of numbering scheme is that?) modified
at LHO/LLO ~8 years ago to have better resolution
 D980400-B.pdf 
  1956   Thu Aug 27 13:42:08 2009 ranaSummaryPSLReference Cavity Temperature Control: psl.db changesI made the changes
to the psl.db to handle the new Temperature
  
  1958   Thu Aug 27 16:14:28 2009 steveSummaryOMCburned photodiodeOld -pre 6/2009  LLO DCPD 3 mm od
GTRAN photodiode
 20090827_173252.jpg20090827_170802.jpg 
  1967   Fri Sep 4 16:09:26 2009 josephbSummaryVACRebooted RGA computer and reset RGA settingsSteve noticed the RGA was not working today. 
It was powered on but no other lights were
lit.
  
  1978   Tue Sep 8 20:15:33 2009 rana, jenneSummaryPSLRC temperature servo: Heater Voltage noiseWe measured the voltage noise of the
heater used to control the RC can temperature.
It is large.
 09080901.PDFTEK00074.PNG 
  1993   Fri Sep 18 16:26:02 2009 steveSummaryPSLNeslab chiller is OKRob found puddles of water very close to
the chiller during lunch time. We raised
the unit and took the side cover off. All
  
  1999   Thu Sep 24 20:17:05 2009 ranaSummaryLSCComparison of Material Properties for the new RFPD Mounts
    

       
             
  
  2043   Fri Oct 2 15:24:29 2009 sanjit, ranaSummaryIOOmcwfs centeredwe set the offsets for the MCWFS DC and
for the MCWFS demod outputs and then turned
off the lights put the MZ at half fringe
 Untitled.png 
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