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  40m Log, Page 273 of 344  Not logged in ELOG logo
ID Date Author Typedown Category Subject Text Attachments
  1209   Wed Dec 31 22:59:40 2008 YoichiSummaryEnvironmentParticle counts going crazyYes it is a new year's eve, and a lot of crazy
people are on Colorado to secure seats for
the parade tomorrow.
  
  1211   Thu Jan 1 01:07:03 2009 YoichiSummaryEnvironmentParticle counts going crazyI increased the fan speed of the PSL HEPA
filter to the maximum.
  
  1212   Thu Jan 1 01:15:45 2009 YoichiSummaryVACN2 line leak ?I've been replacing the N2 bottles recently.
I noticed that the consumption is too high.
I had to replace them every two days.
  
  1213   Fri Jan 2 17:20:44 2009 ranaSummaryComputer Scripts / Programs40m GWINCI have made a '40m' directory in the iscmodeling
CVS tree which allows one to run a 40m version
of GWINC.
 bench40.pdf 
  1235   Fri Jan 16 18:33:54 2009 YoichiSummaryComputersc1lsc rebooted to fix 16Hz glitchesKakeru, Yoichi

There were 16Hz harmonics in the PD3 and
  
  1280   Fri Feb 6 14:49:31 2009 steveSummarySAFETYlaser inventory
40M Laser Inventory at Feb 05,
2009
 

1, Lightwave PA#102 @ 77,910
  
  1297   Thu Feb 12 14:39:07 2009 ranaSummaryGeneralSilicon Beam Dump testYesterday evening, Ken Mailand and I tested
the reflectivity of a piece of polished Silicon.
Since Silicon has such a high thermalconductivity
  
  1331   Sun Feb 22 23:43:07 2009 carynSummaryGeneraltemperature sensorComparing  PSL-FSS-RMTEMP and PEM-MC1-TEMPS
So, to compare temp channels, I made
a plot of PSL-FSS_RMTEMP and PEM-MC1_TEMPS(the
 12x 
  1338   Thu Feb 26 00:36:53 2009 YoichiSummaryComputersC1:LSC-TRX_OUT broken (and fixed later).Today, Kakeru tried to convert C1:LSC-TRX_OUT
and  C1:LSC-TRY_OUT to DAQ channels.
He edited C1LSC.ini in the chans/daq directory
  
  1367   Fri Mar 6 18:22:42 2009 YoichiSummaryComputersScripts to restart the FE computersWhile doing locking, the FE computers are
overloaded sometimes and I have to reboot
them.
  
  1383   Wed Mar 11 01:16:40 2009 ranaSummaryIOOrogue trianglewave in the MC Servo offset sliderOn Monday
evening, I ran this command: trianglewave
C1:IOO-MC_REFL_OFFSET 0 4 120 600;ezcawrite
 Untitled.pngUntitled.pnga.png 
  1415   Sun Mar 22 22:39:24 2009 ranaSummaryLSCCalibration of the ITM and ETM ActuationI used the following procedure to calibrate
the ITMX actuation signal.
 free.png 
  1425   Wed Mar 25 01:37:35 2009 rana, yoichiSummaryIOONo Reference Cavity RequiredWe were wondering if we need to have a reference
cavity. One possible reason to have one is
to reduce the free running
  
  1435   Fri Mar 27 02:40:06 2009 peteSummaryIOOMC glitch investigationYoichi, Pete
The MC loses lock due to glitches
in the MC1 coils. 
We do
 MC1_Drift.png 
  1451   Wed Apr 1 23:18:07 2009 rana, kojiSummaryIOONo Reference Cavity RequiredKoji sent us a note about our "No Reference
Cavity Required" entry. I thought that it
nicely summarizes the
  
  1465   Thu Apr 9 23:11:27 2009 robSummaryLockingLaser PM to PO-DC transfer functions at multiple CARM offsetsI've plotted some transfer functions showing
the response at POB DC to laser frequency
(phase) noise.  There are transfer functions
 CARMoffs1.pngCARMoffs2.pngCARMcarpet.png 
  1466   Thu Apr 9 23:20:35 2009 robSummaryLockingLaser PM to REFL-DC transfer functions at multiple CARM offsets


   
        
            
 CARMoffs1_r.pngCARMoffs2_r.pngCARMcarpet_r.png 
  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


   
        
            
  
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