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ID Date Author Type Category Subject Text Attachments
  4547   Wed Apr 20 21:53:01 2011 SureshConfigurationRF SystemRF system: Stray heliax cableWe found a stray unused heliax   rogue_cable_1.png 
  4546   Wed Apr 20 20:42:55 2011 kiwamuUpdateVIDEOtoday's video session[Steve / Suresh / Kiwamu]
90
% of unused video cables have been removed.
 DSC_2931_ss.jpgDSC_2938_ss.jpg 
  4545   Wed Apr 20 11:02:18 2011 josephbUpdateCDSMEDM screens and Front Ends updated to new MatricesWe simply didn't any matrices larger than
16x16.  If we had, than that matrix would
not have worked properly since the beginning.



  
  4544   Tue Apr 19 17:34:02 2011 KojiUpdateCDSMEDM screens and Front Ends updated to new MatricesJust a curiosity:
I just wonder how you have distingushed
the difference between _1
  
  4543   Tue Apr 19 15:48:43 2011 josephbUpdateCDSMEDM screens and Front Ends updated to new MatricesProblem:
The original matrix
naming conventions for the front ends was
  
  4542   Mon Apr 18 21:14:53 2011 JamieConfigurationComputersnew control room machine: pianosaAlso, op440m's Sun monitor did not work well
with pianosa, so I'm lending pianosa my HP
monitor until we can get a suitable replacement.
  
  4541   Mon Apr 18 21:09:45 2011 JamieConfigurationComputersnew control room machine: pianosaI've just installed the new control room
machine: "pianosa".   It is
a replacement for the old sun machine "op440m"
  
  4540   Mon Apr 18 17:47:41 2011 kiwamuConfigurationLSCLSC rack's ADC cablingTo
understand the situation of the ADC cabling
at the LSC rack I looked around the rack
 LSCrack.png 
  4539   Mon Apr 18 14:11:44 2011 kiwamuUpdateLSCRF status We
will make them all green !!
 RF_Work_Status.png 
  4538   Mon Apr 18 13:05:57 2011 kiwamuSummaryLSCdemod board modificationHere
is the idea how we upgrade the demodulation
boards. 
 demod_board.png 
  4537   Sat Apr 16 02:00:14 2011 ranaUpdateLSC11MHz demod board : 90 degree splitterOne way to avoid some of the bad stuff
in there is to take the 1 dBm input and amplify
it to ~21 dBm before splitting and sending
  
  4536   Fri Apr 15 22:57:38 2011 Aidan, JamieConfigurationLSCAS PD and Camera installedAS port ITMX YAW  range where AS beam
was visible = [-1.505, -1.225] - these extrema
put the beam just outside of some aperture
  
  4534   Fri Apr 15 22:54:20 2011 Aidan, BryanUpdateGreen LockingBeat note amplitude on Vertex PDI was investigating the beat note amplitude
on the vertex PD again yesterday. The incident
power on the PD was 150uW in the PSL green
  
  4533   Fri Apr 15 15:15:08 2011 kiwamuUpdateLSC11MHz demod board : 90 degree splitter[Rana, Koji, Kiwamu]
 Moreover
the amplitude of the I and Q signals are
  
  4532   Fri Apr 15 13:43:23 2011 BryanConfigurationGreen LockingI leave you with these messages...Y-end PDH electronics.  Y_End_Electronics_TF.png 
  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 
  4530   Fri Apr 15 12:17:39 2011 kiwamuUpdateLSC11MHz demod board : funny I-Q phaseDuring checking
the 11MHz demod boards I found that the I-Q
 relativephase.png 
  4529   Fri Apr 15 02:30:24 2011 KojiHowToVIDEOVideo switching tipI have made a small python script to handle
the video matrix.
It is too far from the perfection,
  
  4528   Fri Apr 15 02:18:50 2011 KojiUpdateLSCBunch of RF cables removedWhile Kiwamu was working on the RF cabling
at the LSC rack, I removed 80% of SMA cables
which were not connected anywhere.
  
  4527   Fri Apr 15 02:17:18 2011 kiwamuUpdateLSCMichelson locked[Koji / Kiwamu]
The
  
  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 
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