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  40m Log, Page 57 of 355  Not logged in ELOG logo
ID Date Author Typeup Category Subject Text Attachments
  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 
  9004   Tue Aug 13 11:40:19 2013 Alex ColeSummaryElectronicsRFPD Demod Filter Frequency Response Measurement For the RF PD Frequency Response
Measurement project, we get each PD signal
from the "PD RF Mon" output of
 photo_(3).JPGtest.jpg 
  9009   Tue Aug 13 21:49:32 2013 KojiSummaryGeneralTesting new AG4395A network analyzerNew AG4395, sn MY41101114  for West
Bridge Labs was delivered. For the test purpose
it is at the 40m now.
 AG4395A_noise.pdf 
  9010   Tue Aug 13 22:21:12 2013 KojiSummaryGeneralMinicircuit Filter TFs (AG4395A test)As a part of the network analyzer test
in the previous entry, the transfer functions
of Mini-Circuits filters we have at the 40m
 Minicircuit_LPF.pdfMinicircuit_BPF.pdfMinicircuit_HPF.pdf130813.zip 
  9012   Thu Aug 15 01:51:50 2013 KojiSummaryGeneralRFM<->Dolphin bridge distributed to c1rfm and c1mcsSince the RFM-Dolphin bridges for the ASX
model was added to the c1rfm model, c1rfm
kept timing-out from the single sample time
  
  9021   Sun Aug 18 16:04:07 2013 ranaSummaryCDSFB lights all RED: mxstream restartSun Aug 18 15:52:50 2013
Found the FB lights (C1:FEC-NN_FB_NET_STATUS
and C1:DAQ-DC0_C1XXX_STATUS) RED for everything
 IFO-Trend.png 
  9022   Sun Aug 18 17:56:16 2013 ranaSummaryCDSMEDM Screen CPU UsagesI noticed at LLO (?) that the LSC screen
there uses up ~25-30% of the CPU time on
a single core for the control room iMac workstations
 obama1404_666531c.jpg 
  9042   Tue Aug 20 16:23:41 2013 ranaSummaryGeneral/home/cds nearly full/home/cds is >98% full - below are some
of the usage numbers:
  
  9044   Wed Aug 21 00:18:03 2013 MasayukiSummaryGreen LockingX-arm PDH OLTF measurement[Manasa Masayuki]
Today we measured the openloop transfer
function of the PDH green lock of the x-arm.
 IMG_1226.JPGIMG_1228.JPG 
  9045   Wed Aug 21 17:42:03 2013 ranaSummaryGeneral/home/cds nearly fullOne of the reasons that our disk is getting
full is due to the scripts_archive directory.
A backup script runs on op340m and makes
  
  9047   Wed Aug 21 19:37:25 2013 MasayukiSummaryGreen LockingX-arm PDH OLTF measurement[Manasa, Masyauki]

Today we measured OLTF of PDH green
 OLTF_PDH_Glock_6_5_2.png 
  9054   Thu Aug 22 20:25:28 2013 MasayukiSummaryGreen LockingY-arm PDH OLTF measurement[Manasa, Masayuki]
We measured the the openloop transfer
function of the PDH green lock of the y-arm.The
 OLTF_PDH_Glock_yarm_7.png 
  9089   Fri Aug 30 01:01:28 2013 rana, nicSummaryComputer Scripts / ProgramsaLIGO Noise Budget code installed and runningChris Wipf has been developing a new Noise
Budget code that allows us to use our existing
Simulink models to handle all of the noise
 NBplots.pngScreen_Shot_2013-08-30_at_1.00.02_AM.png 
  9123   Wed Sep 11 23:34:37 2013 MasayukiSummaryGreen LockingALS locking in both arms[manasa, masayuki]
We locked the XARM and YARM with
using ALS control loop and
 noise.pdf 
  9124   Wed Sep 11 23:43:10 2013 KojiSummaryGreen LockingALS locking in both armsWhat was the beat freq for each arm?
The HF noise level depends on the
frequency of the beat note.
  
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