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  40m Log, Page 133 of 344  Not logged in ELOG logo
ID Date Author Typeup Category Subject Text Attachments
  4454   Mon Mar 28 23:51:54 2011 JenneUpdatePSLNew PMC Base Riser Design


   
        
            
  
  4455   Tue Mar 29 00:00:55 2011 KojiUpdateIOOFixing MC/Freq Divider BoxThis is the log of the work on Wednesday
23rd.
1. Power Supply of the freq divider
  
  4456   Tue Mar 29 15:01:58 2011 Larisa ThorneUpdateElectronicsLow pass filter for X arm laser temperature control This is the continuation of http://nodus.ligo.caltech.edu:8080/40m/4402
 
 DSC_2889.JPGLPFgraph.pdf 
  4457   Tue Mar 29 15:50:21 2011 KojiUpdateElectronicsLow pass filter for X arm laser temperature controlFor bode plot:

USE LOG-LOG plot for the amplitude
  
  4458   Tue Mar 29 22:29:16 2011 kiwamuUpdateGeneralsome tasks tomorrow *  Temporary strain relief for
the heliax cables on 1X2 (Steve)
  
  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
  
  4462   Wed Mar 30 17:01:08 2011 Larisa ThorneUpdateVIDEOCable laying...continued[Steve, Suresh, Kiwamu, Larisa]
 
Only the PRM/BS cable was laid today.
  
  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
  
  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 
  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.
  
  4482   Fri Apr 1 23:05:58 2011 kiwamuUpdateGreen Lockingnoise budget 
 noise_budget.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
  
  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 
  4492   Wed Apr 6 16:02:07 2011 Larisa ThorneUpdateElectronicsCable laying...continued[Steve, Kiwamu, Larisa]
 
Having finished laying new cable
  
  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 
  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
  
  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 
  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 
  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
  
  4508   Mon Apr 11 11:34:05 2011 KojiUpdateElectronicsNew Green PD test1

    

       
            
 SGD444A_240_test.png 
  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
  
  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?). 
  
  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
  
  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
  
  4513   Mon Apr 11 21:13:15 2011 KojiUpdateElectronicsNew Green PD test1Correction:
The (-) input has been decoupled
by the capacitor. So the series resistance
  
  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
  
  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.
  
  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
  
  4518   Wed Apr 13 11:34:07 2011 josephbUpdateCDSFixed IFO_ALIGN.adlProblem:
I switched the
ITMX and ITMY control channels yesterday,
  
  4519   Wed Apr 13 16:38:17 2011 Larisa ThorneUpdateElectronicsVideo MUX camera/monitor check [Kiwamu, Larisa]
 
The following Video MUX inputs(cameras)
  
  4522   Thu Apr 14 00:21:28 2011 KojiUpdateCDSNew C1LSC code running[Jamie, Jenne, Koji]
We installed the new c1lsc and started
the process.
  
  4523   Thu Apr 14 01:03:43 2011 KojiUpdateLSCLSC Campaign ~ StatusTarget:
To lock the Michelson with the new RF/LSC

Status
  
  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
  
  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 
  4527   Fri Apr 15 02:17:18 2011 kiwamuUpdateLSCMichelson locked[Koji / Kiwamu]
The
  
  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.
  
  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 
  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 
  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
  
  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
  
  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
  
  4539   Mon Apr 18 14:11:44 2011 kiwamuUpdateLSCRF status We
will make them all green !!
 RF_Work_Status.png 
  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
  
  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
  
  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.



  
  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 
  4548   Wed Apr 20 22:29:07 2011 sureshUpdateRF SystemPlan for LSC rackThe suggested layout of the 1Y2 Rack is
shown below.
To simplify the wiring, I have largely
 1Y2_Rack_Layout.png 
  4550   Thu Apr 21 08:26:42 2011 steveUpdatePEMPSL enclosure work todayThe east side window guides  will
be replaced by one long U-channel. There
will be drilling into 2x2 steel frame. It
  
  4551   Thu Apr 21 14:39:43 2011 steveUpdateRF Systemnew strain relieved N connectors at APNew right angle PVC, 2 x 2 x  1/4"
installed at the AP table to strain relief
the 1/4" spiral corrugated RF coaxes.
 P1070562.JPGP1070564.JPG 
  4552   Thu Apr 21 15:03:29 2011 steveUpdateComputersjuction board finds homeThe anti aliasing box was opened up at
the back to accommodate the junction board
and the SCSI cable towards the ADC. Aluminum
 P1070570.JPGP1070568.JPG 
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