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ID Date Author Typeup Category Subject Text Attachments
  8332   Fri Mar 22 19:46:29 2013 KojiSummaryLSCDiode impedance test resultI've tested Perkin-Elmer InGaAs PDs at
OMC Lab.
- The diode impedances were measured
  
  8343   Mon Mar 25 23:17:11 2013 ranaSummaryIOOMC I measured the dark noise and regular intensity
noise in MC trans tonight to get some estimate
for the free running spectrum that the Chas
 MC-trans.pdf 
  8345   Mon Mar 25 23:20:57 2013 AnnalisaSummaryAuxiliary lockingBeat note found![Annalisa, Manasa]
The beat note between the main PSL
and the auxiliarly NPRO has been found!
  
  8368   Thu Mar 28 19:32:22 2013 AnnalisaSummaryAuxiliary lockingBeat note found! 
 I plot the variation of the
beat note frequency as a function of "Alberto"
 BeatFreq.jpg 
  8401   Wed Apr 3 14:46:17 2013 GabrieleSummaryLSCError signal simulation in PRMIHere is a summary of a simulation of the
error signal behavior in the PRMI configuration.
The main parameters are: 
 14x 
  8402   Wed Apr 3 15:00:24 2013 JamieSummaryElectronicsSorensen supplies in LSC rack (1Y2)I investigated the situation of the two
Sorensen supplies in the LSC rack (1Y2). 
They are there solely to supply power to
 20130403_141842.jpg 
  8411   Thu Apr 4 10:12:55 2013 GabrieleSummaryLSCPOP22 and POP110I had a look at the POP110 signal, with
the PRMI flashing.
1) The LSCoffset script does not
 pop110_2.pdf 
  8412   Thu Apr 4 10:32:42 2013 GabrieleSummaryLSCREFL55 error signalsThe attached plot shows that also the behaviour
of the REFL11 and 55 signals is qualitatively
equal to the simulation outcome.
 prmi_refl_signals.pdf 
  8413   Thu Apr 4 10:46:54 2013 KojiSummaryLSCREFL55 error signalsBeautiful double peaks. I don't see the
triple zero-crossings. Is this because you
adjusted the phase correctly (as predicted)?
  
  8448   Fri Apr 12 10:33:42 2013 CharlesSummaryISSDC-Coupled ISS Servo DesignGeneral ISS Design
Signals
through the ISS are directed as follows:
 Example_Switching_Filter_Transfer_Function_-_Switch_Closed.pngExample_Switching_Filter_Transfer_Function_-_Switch_Open.png 
  8469   Mon Apr 22 11:46:09 2013 KojiSummaryIOOMC locked/aligned. MC WFS offloading by ezcaservoЕру ьс шы
тщц дщслув
фтв фдшптувю
  
  8471   Mon Apr 22 17:06:42 2013 ranaSummaryIOOMC locked/aligned. MC WFS offloading by ezcaservo 
 Why use the PSL beam as a reference?
Don't we want to keep the MC pointing in
  
  8491   Thu Apr 25 10:19:10 2013 KojiSummaryLSCLocking activity on Apr 24thLast night I worked on the several locking
configurations:
  
  8537   Tue May 7 16:21:01 2013 JenneSummaryLSCError signal simulation in PRMII asked Gabriele why it looked like for
the PRCL sweep REFL 55 I&Q were zero
at zero, but for the MICH sweep only REFL55
 8x 
  8555   Thu May 9 00:05:12 2013 rana, Koji, JenneSummaryLSCAA and AI changeWe would
like to increase the UGF of the PRC loop
 AAAI.pdf 
  8575   Tue May 14 20:30:29 2013 JamieSummaryIOOMC error spectrum at various FSS gain settings.I used the Agilent 4395A and the GPIB network
bridge to measure the MC error spectrum at
the MC servo board.
 7x 
  8580   Wed May 15 17:17:05 2013 JamieSummaryCDSAccounting of ADC/DAC channel availabilityWe need ADC and DAC channels for a couple
of things:

    POP QPD: 3x ADC
  
  8581   Wed May 15 17:38:49 2013 JamieSummaryCDSAA/AI requirements

    

       
            
  
  8583   Wed May 15 19:32:04 2013 ranaSummaryCDSAccounting of ADC/DAC channel availability
    
  
  8585   Wed May 15 22:47:11 2013 JamieSummaryCDSAccounting of ADC/DAC channel availability

    

       
            
  
  8587   Thu May 16 01:41:31 2013 JenneSummaryIOOFSS gain settings set

    

       
            
  
  8598   Fri May 17 18:58:58 2013 Jamie, KojiSummaryCDSWeird DAC bit flipping at half integer output valuesWhile looking at the DAC anti-imaging filters,
Koji noticed an odd feature of the DAC output:
 const.pdfsweep.pdf 
  8599   Fri May 17 19:56:52 2013 KojiSummaryCDSWeird DAC bit flipping at half integer output valuesLet me make a complimentary comment on
this effect.
Because of this oscillation feature,
  
  8612   Wed May 22 00:42:13 2013 KojiSummarySUSviolin QWhile looking at the decay of the violin
mode of the PRM, I made a simple measurement
of the decay rate.
  
  8613   Wed May 22 11:09:33 2013 JamieSummaryCDSWeird DAC bit flipping at half integer output valuesAfter querying CDS folks about this issue,
I got some responses that indicated the problems
was likely limit-cycle oscillations due to
 nopad.pdf 
  8614   Wed May 22 11:21:28 2013 KojiSummaryCDSWeird DAC bit flipping at half integer output valuesIs this limit cycle caused by the residual
of the digital AI filtering at the half sampling
freq and that his the threshold?
  
  8615   Wed May 22 11:35:06 2013 JamieSummaryCDSWeird DAC bit flipping at half integer output values

    

       
            
  
  8616   Wed May 22 15:08:37 2013 KojiSummaryCDSWeird DAC bit flipping at half integer output valuesIt seems that the effect is from the (linear)
residual fluctuation of the digital AI filter
for the zero-padded signal.
 Screenshot.png 
  8624   Thu May 23 01:27:11 2013 ManasaSummaryLSCXarm beat note search continuesTowards finding the x-arm beat note:

The green would not lock to a maximum
  
  8626   Thu May 23 10:24:23 2013 JamieSummaryCDSc1scy model continues to run at the hairy edgec1scy, the controller model at  the Y END,
is still running very long, typically at
55/60 microseconds, or ~92% of it's cycle. 
  
  8629   Thu May 23 13:14:34 2013 KojiSummaryLSCXarm beat note search continuesWe should consider to hook up the temperature
monitors of the NPROs to the ADCs.
  
  8631   Thu May 23 17:51:39 2013 KojiSummaryLSCMy usual locking procedureFor purpose of the automation and my record,
I summarized my locking procedure as a chart.
 PRMI_locking_procedure.pdf 
  8686   Thu Jun 6 15:46:10 2013 Max HortonSummaryGeneral Smart UPS 2200 Batteries ReplacedReplaced the batteries successfully in
the control room.  We just had to switch
the clips from the old batteries to the new
  
  8694   Tue Jun 11 22:16:56 2013 ManasaSummaryGreen LockingALS for X armI discussed with Yuta about the ALS servo
and phase tracker and found that there was
a lot of information lying around from last
  
  8703   Thu Jun 13 22:31:12 2013 ManasaSummaryGreen LockingX arm ALSStabilized ALS
and beat frequency sweep realized.
 IMG_0659.JPGALS_stabilized_13June2013.png 
  8708   Fri Jun 14 07:06:19 2013 KojiSummaryGreen LockingX arm ALSIt's nice that we are now able to scan
the cavity again. We got close to PRMI+one
arm one step further.
  
  8717   Tue Jun 18 10:37:00 2013 SteveSummaryGeneralnew laser pointers  Red-green
laser pointers added to the depleted
stock of 2011
  
  8738   Mon Jun 24 16:06:17 2013 ManasaSummaryGreen LockingALS model I am working on the basic
ALS servo model. The simulink model for the
same is attached. The loop is not yet complete
 elog.zip 
  8752   Wed Jun 26 01:30:31 2013 ranaSummaryPEMVariation in 10-30 Hz seismic RMSFor quite a while (no one knows how long),
we've seen fluctuations in the 10-30 Hz seismic
motion. This shows up as the purple trace
 gur1z_rms.pdfgur1z.pdf 
  8776   Thu Jun 27 22:52:38 2013 Rana, Gabriele, FrancescoSummaryComputer Scripts / ProgramsLIGO-DV installedI installed ligoDV in the /ligo/apps/ligoDV/
Now, by pointing the tool at the
local NDS2 server (megatron:31200) you can
 ldv.png 
  8795   Wed Jul 3 11:07:17 2013 AlexSummary Photodetector Characterization [Alex, Koji]
We characterized Koji's BBPD
MOD for REFL165 (see attachment).
 BBPD_PCB.pdftransimpedance_measurement.pdf 
  8797   Wed Jul 3 14:33:46 2013 KojiSummaryLSCTest result for the REFL165 photodetectorP.1 Circuit diagram
Added components are indicated by
red symbols.
 REFL165_response_130702.pdf 
  8816   Tue Jul 9 23:27:17 2013 KojiSummaryLSCMICH: ITMX/Y <=> PRM/BSThe MICH actuation with PRM/BS was investigated
again.
(ITMX -1 / ITMY +1) is equivalent
  
  8882   Fri Jul 19 22:35:06 2013 KojiSummaryLSCVarious Arm signal (Yarm)The StripTool plot attached below shows
various arm signals measured with the Y arm
cavity swept using ALS.
 various_arm_signal.png 
  8885   Fri Jul 19 23:35:52 2013 KojiSummaryLSCTRY DC lockingThe
Y arm was locked with the TRY DC signal.
The
 TRY_locking.png 
  8887   Mon Jul 22 03:10:41 2013 ranaSummaryloreAngel of the Y End Table? Trying to take an image or movie
of the ETMY Transmon cam, we got instead
this attached image.
 asdasd.jpg 
  8888   Mon Jul 22 06:58:17 2013 LisaSummaryloreAngel of the Y End Table?

    

       
            
 image.jpg 
  8905   Tue Jul 23 13:29:58 2013 KojiSummaryGeneral record of the initial state  initial_state_130723.png 
  8987   Thu Aug 8 18:43:12 2013 SujanSummaryPEMOptimally subtracting signals from two seismometers.An exercise of optimally subtracting one
seismometer signal by  another using weiner
filters was done. Results have been summarized
 Results.pdf 
  8988   Thu Aug 8 18:47:41 2013 SujanSummaryPEMUsing weiner filters for subtracting signals MC_L and GUR2_XI used MC_L signal from the Mode Cleaner
as the desired signal with  GUR2_X as witness
signals. I observed good subtraction where
 Results.zip 
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