40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 250 of 339  Not logged in ELOG logo
ID Date Author Type Category Subject Text Attachments
  4526   Thu Apr 14 19:05:17 2011 KojiUpdateLSCNew (temporary) LSC screen[Jenne Koji]
The PD signals are transmitted to
the suspension now.
 temporary_LSC_screen.png 
  4525   Thu Apr 14 17:45:59 2011 BryanConfigurationGreen LockingI leave you with these messages...OK…
the Y-arm may be locked with green light,
which was the goal, and this is all good
  
  4524   Thu Apr 14 12:57:15 2011 josephbUpdateCDSRFM network happy again[Joe, Alex]
Problem Symptoms:
There
were red lights on the status screen indicating
  
  4523   Thu Apr 14 01:03:43 2011 KojiUpdateLSCLSC Campaign ~ StatusTarget:
To lock the Michelson with the new RF/LSC

Status
  
  4522   Thu Apr 14 00:21:28 2011 KojiUpdateCDSNew C1LSC code running[Jamie, Jenne, Koji]
We installed the new c1lsc and started
the process.
  
  4521   Wed Apr 13 23:32:07 2011 Aidan, JamieConfigurationLSCAS PD and Camera installedI spent some time tracking down the AS
beam which had vanished from the AP table.
Eventually, by dramatically mis-aligning
 AS_beam.jpgP1070546.JPG 
  4520   Wed Apr 13 16:56:08 2011 BryanConfigurationGreen LockingY-ARM Green-Locked! Locked!
The Y-arm can
  
  4519   Wed Apr 13 16:38:17 2011 Larisa ThorneUpdateElectronicsVideo MUX camera/monitor check [Kiwamu, Larisa]
 
The following Video MUX inputs(cameras)
  
  4518   Wed Apr 13 11:34:07 2011 josephbUpdateCDSFixed IFO_ALIGN.adlProblem:
I switched the
ITMX and ITMY control channels yesterday,
  
  4517   Tue Apr 12 18:15:07 2011 kiwamuSummaryIOORF combiner is more like attenuator 
I realized
 reflection_test.png 
  4516   Tue Apr 12 16:01:33 2011 josephbUpdateGeneralRFM errorsProblem:
Currently the c1scy,
c1mcs, and c1rfm models are reporting an
error with receiving some data sent over
  
  4515   Tue Apr 12 12:01:30 2011 josephbUpdateGeneralIFO controls, now with 10% less lying (ITMX/ITMY controls swapped)The ITMX/ITMY control swap is complete.
The
steps from this
elog were followed.
  
  4514   Mon Apr 11 23:35:02 2011 ranaUpdateRF SystemInstalled low pass filters in the demod boardsI am a little concerned about using these
low pass filters so close to the band edge.
Recall that there is no on-board preamp for
  
  4513   Mon Apr 11 21:13:15 2011 KojiUpdateElectronicsNew Green PD test1Correction:
The (-) input has been decoupled
by the capacitor. So the series resistance
  
  4512   Mon Apr 11 20:03:05 2011 taraUpdateElectronicsTTFSS for 40mI brought TTFSS set #7 to 40m and kept
it in the electronic cabinet.
note that Q4 transistor has not been
  
  4511   Mon Apr 11 19:09:59 2011 SureshUpdateRF SystemInstalled low pass filters in the demod boards 
As part of the RF system upgrade
some of the demod boards in the lab were
  
  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?). 
  
  4509   Mon Apr 11 13:30:04 2011 josephb, JamieUpdateCDSNo Wiper script - Frames full over weekendProblem:
The daqd
process was dying every minute or so when
it couldn't write frame.  This was slowing
  
  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 
ELOG V3.1.3-