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  40m Log, Page 255 of 344  Not logged in ELOG logo
ID Datedown Author Type Category Subject Text Attachments
  4508   Mon Apr 11 11:34:05 2011 KojiUpdateElectronicsNew Green PD test1

    

       
            
 SGD444A_240_test.png 
  4507   Mon Apr 11 09:49:53 2011 ranaUpdateElectronicsNew Green PD test1 Ooh. Can you explain the purpose
of the resistors which are connected to the
(+) inputs? It looks like some real electronics
  
  4506   Sun Apr 10 19:14:08 2011 KojiUpdateGreen LockingNew Green PD test1I started to modify another green PD set.
It so far has the transimpedance
of 240 Ohm on CLC409 for the RF output.
 SGD444A_240.pngSGD444A_240_test.png 
  4505   Fri Apr 8 20:43:46 2011 kiwamuSummaryIOORF combiner + resonant box : impedance and reflection coefficient The
input impedance of the resonant box was measured
when an RF combiner was attached to the box.
 imp_refl.png 
  4504   Fri Apr 8 19:43:03 2011 kiwamuSummaryIOORF combiner eases impedance mismatchingAn RF combiner should  modulationBox.png 
  4503   Fri Apr 8 01:05:45 2011 SureshUpdateRF SystemRF Source Harmonics 
 The measured power levels of
the RF source harmonics are given below:
 RF_Source_Harmonics_Sheet1.pdf 
  4502   Thu Apr 7 21:58:57 2011 AidanSummaryGreen LockingBeat note amplitudeHaving convinced myself that the green
Hartmut PD is giving an acceptable response
at RF frequencies I decided to double-check
  
  4501   Thu Apr 7 19:28:02 2011 KojiSummaryGreen Locking(In)sanity check of Green PD - some inconsistenciesResponsivity of SGD-444A


 SGD-444A.png 
  4500   Thu Apr 7 16:09:17 2011 AidanSummaryGreen Locking(In)sanity check of Green PD - some inconsistenciesI think I had underestimated the responsivity
of the Silicon PD at 1064nm. The previous
value was based on a rough search online
  
  4499   Thu Apr 7 13:14:23 2011 josephbUpdateCDSProposed plan for ITMX/ITMY control switchProblem:
The controls (fast
and slow both) think ITMX is ITMY and ITMY
  
  4498   Thu Apr 7 13:12:23 2011 KojiHowToVIDEOVideo switching tipLong time ago, I looked at the manual of
the video switcher. 
  
  4497   Thu Apr 7 11:51:13 2011 steveSummarySAFETYnew crane operator inaugurated

    

       
            
 P1070535.JPG 
  4496   Thu Apr 7 11:38:56 2011 steveUpdatePSLenclosure windows on the east side of the PSLThe PSL enclosure now have 4 windows on
each side. The bottom rail guides on the
east side will be replaced by  one 
 P1070538.JPG 
  4495   Wed Apr 6 22:13:24 2011 BryanConfigurationGreen LockingResonating green light!Every so often things just work out. You
do the calculations, you put the lenses on
the bench, you manually adjust the pointing
  
  4494   Wed Apr 6 19:36:32 2011 AidanSummaryGreen Locking(In)sanity check of Green PD - some inconsistenciesI moved the Hartmut Green PD to the Jenne
laser bench to try to determine if the response
at RF was reasonable or somehow very much
 PD_measurement.pngplot_PD_RF_ratios.pdf 
  4493   Wed Apr 6 18:55:49 2011 Jamie, LarisaConfigurationLSCmajor AP table cleanupWe ripped out all of the old AS, PLL, and
REFL paths, green, orange, and cyan respectively
on the old
  
  4492   Wed Apr 6 16:02:07 2011 Larisa ThorneUpdateElectronicsCable laying...continued[Steve, Kiwamu, Larisa]
 
Having finished laying new cable
  
  4491   Wed Apr 6 02:41:01 2011 kiwamuUpdateGreen Lockingnoise budget : some more noise It turned out that the dark noise from
the beat PD and the shot noise on the beat
PD was overestimated.
 noise_budget.png 
  4490   Tue Apr 5 21:20:11 2011 KojiSummaryGreen LockingX-arm cavity locked with LB1005 servo boxLast Thursday, I tested Newport
Servo Controller LB1005 with the X_arm
green PDH servo.
 servo.pngOLTF.pdf 
  4489   Tue Apr 5 19:54:39 2011 KojiSummaryGreen LockingHamamatsu S3399 testSince last Friday I have been testing the
broadband RF photodetector in order to
figure out the capability of S3399 with the
 S3399_test_110405.pngS3399_test_110405.pdf 
  4488   Tue Apr 5 17:31:59 2011 steveSummaryGeneralnew laser pointers

    

       
            
 P1070530.JPG 
  4487   Tue Apr 5 17:04:36 2011 steveSummarySAFETYcranes inspected and load testedMike Caton of Konecranes inspected and
loadtested all 3  of the 40m cranes
at max reach trolley positions with 1 ton.
 P1070522.JPGP1070532.JPG 
  4486   Mon Apr 4 18:58:44 2011 BryanConfigurationGreen LockingA beam of purest greenWe now have green light at the Y end. 
The set-up (with careful instructions
 P4040042.JPG 
  4485   Mon Apr 4 14:20:32 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching   Waist_Fits_from_laser.pngWaist_Fits_Bench_Position.png 
  4484   Mon Apr 4 11:52:13 2011 JenneUpdatePEMSTS2s unpackedI unpacked the STS2 seismometers that we
borrowed from LLO.  They are sitting
underneath the Xarm, in the middle of the
  
  4483   Fri Apr 1 23:49:24 2011 kiwamuSummaryGreen Lockingtwo states in green beat-noteAccording
to the measurement done by Aidan and me,
there are two beat-note state.
  
  4482   Fri Apr 1 23:05:58 2011 kiwamuUpdateGreen Lockingnoise budget 
 noise_budget.png 
  4481   Fri Apr 1 18:54:41 2011 BryanConfigurationGreen LockingY end doubling ovenThe doubling oven is now ready to go for
the Y arm. The PPKTP crystal is mounted in
the oven:
 P4010036.JPGP4010041.JPG 
  4480   Thu Mar 31 20:46:11 2011 AidanSummaryGreen LockingGreen beat note PD DC responseI measured the DC response of the Green
PD
  
  4479   Thu Mar 31 20:37:10 2011 AidanSummaryGreen LockingRF amplitude source I gutted one of the $2 red laser
pointers to build a laser source whose amplitude
we could modulate at RF frequencies. Basically,
 P1000543.jpgP1000544.jpgP1000545.jpg 
  4478   Thu Mar 31 19:58:11 2011 kiwamuUpdateCDSc1iscex crashedAfter
I did several things to add new DAQ channels
on c1iscex it suddenly became out of network.
  
  4477   Thu Mar 31 15:23:14 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching

    

       
            
 Zoomed_out_fitting01.pngZoomed_in_fitting01.png 
  4476   Thu Mar 31 14:10:00 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching

    

       
            
 P3310028.JPGP3310029.JPG 
  4475   Thu Mar 31 11:30:51 2011 steveConfigurationGeneralstrain relieved rf cablesI strain relieved RF cables labeled 33
MHZ LO and 166 MHZ to EOM at 1X2  This
is a temporary setup for the 11 MHZ
 P1070491.JPG 
  4474   Thu Mar 31 08:31:44 2011 SureshUpdateVIDEOCable laying...continuedThe video work has crossed a milestone.    
Kiwamu and Steve have shifted the
three quads from the control room to
 P1070489.JPGP1070494.JPG 
  4473   Thu Mar 31 02:59:49 2011 KojiConfigurationGreen LockingThe wonderful world of mode-matching I went through the entries.
1. Give us a photo of the day. i.e.
Faraday, tilted lens, etc...
  
  4472   Wed Mar 30 21:46:10 2011 Aidan, KiwamuUpdateGreen LockingStates of the Green beat noteThe attached table shows the amplitude
of the green beat note when the end laser
was in various states. We can increase the
  
  4471   Wed Mar 30 21:43:31 2011 Aidan, KiwamuSummaryGreen LockingCalculation of the green contrast on the RF PDSkip to final thought ...
Kiwamu and I have set about measuring
the contrast of the signal on the RF PD.
  
  4470   Wed Mar 30 21:21:15 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep 4: Matching into  Oven_Lens_Solution_66mm.pngMatching_Into_Green_Oven_zoomed_out.pngMatching_Into_Green_Oven_zoomed_in.png 
  4469   Wed Mar 30 20:50:43 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep  After_Faraday.pngAfter_Faraday_and_Rotated_Lens.png 
  4468   Wed Mar 30 20:31:30 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep   
  4467   Wed Mar 30 20:14:17 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingAdditional:   
  4466   Wed Mar 30 20:08:34 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep 2: Getting the beam  Beam_Matching_02c_Vertical.pngBeam_Matching_02c_Horizontal.png 
  4465   Wed Mar 30 19:54:19 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching   laser_output_non_circular.png 
  4464   Wed Mar 30 19:43:33 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingRight. I've got a whole load of info and
data and assorted musings I've been saving
up and cogitating upon before dumping it
  
  4463   Wed Mar 30 18:50:57 2011 KojiConfigurationComputer Scripts / ProgramsAdded a sitemap aliasI thought that "m40m" was the
traditional alias for the sitemap...
rossa:~>alias
  
  4462   Wed Mar 30 17:01:08 2011 Larisa ThorneUpdateVIDEOCable laying...continued[Steve, Suresh, Kiwamu, Larisa]
 
Only the PRM/BS cable was laid today.
  
  4461   Wed Mar 30 16:57:13 2011 kiwamuUpdateGeneralturned off c1aux [Steve / Kiwamu]
 As a part of the video cable
session, we reconnected some power cords
  
  4460   Wed Mar 30 16:32:29 2011 AidanConfigurationComputer Scripts / ProgramsAdded a sitemap aliasI added an alias to the sitemap MEDM screen
in /cvs/cds/caltech/target/cshrc.40m
Now you can enjoy launching sitemap
  
  4459   Wed Mar 30 02:55:02 2011 SureshConfigurationElectronicsRF System : Status and PlansI have prepared several diagrams outlining
the current state of the RF System.
These are uploaded into the svn40m
  
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