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  40m Log, Page 59 of 341  Not logged in ELOG logo
ID Date Author Typeup Category Subject Text Attachments
  9779   Wed Apr 2 23:08:51 2014 KojiSummaryASCNew PRM ASC is runningThe new PRM ASC design

Pitch
FM1: zero at 0Hz, pole at 2000Hz,
 PRM_QPD.pdfQPD_spe.pdf 
  9784   Thu Apr 3 18:55:10 2014 ericqSummaryLSCSome CARM related modeling The other day, Jenne and I were comparing
my MIST simulation to her Optickle simulation
for the CARM transfer functions I posted
 asIsPRCRes.pdfidealPRCRes.pdf3fPrclAnglesCarm.pdf 
  9785   Fri Apr 4 18:51:29 2014 ericqSummaryLSCMORE CARM related modelingIn today's ISC call, Kiwamu was comparing
two ways to approach resonance: 

    "C-Type": The
 9x 
  9794   Thu Apr 10 10:52:15 2014 manasaSummaryIOOMC2_TRANS path in WFS servo

    

       
            
  
  9837   Mon Apr 21 23:33:57 2014 ranaSummaryGreen LockingHP 8591E reads low by 140 Hz out of 10 MHzTo
check the basolute frequency stability of
the old monochrome HP 8591E RF Spectrum analyzer
  
  9857   Fri Apr 25 23:08:57 2014 ranaSummaryIOOMC2_TRANS QPD Servo re-re-engaged againWe turned on the MC2_TRANS paths for both
PIT/YAW tonight.
  
  9858   Sat Apr 26 13:19:59 2014 ericqSummaryIOOMC2_TRANS QPD Servo re-re-engaged again

    

       
            
  
  9869   Mon Apr 28 15:47:57 2014 manasaSummaryIOOMC2_TRANS QPD Servo trend

    

       
            
 MC_TRANSservoApr28.png 
  9871   Mon Apr 28 20:31:38 2014 ranaSummaryIOOMC2_TRANS QPD Servo trendThis is a 4-day trend. I don't see any
difference here which is significant. My
guess is that the MC_TRANS servo gain is
 Untitled.png 
  9886   Wed Apr 30 21:57:07 2014 ranaSummaryIOOMC2_TRANS QPD Servo now on for real   dolphin.pngMC2_QPD_trend.png 
  9925   Wed May 7 23:09:06 2014 rana, jamieSummaryComputer Scripts / ProgramsOttavia back on networkAfter Jamie fixed the third party repo
issue with Ottavia, he was able to upgrade
it to Ubuntu 12.04 Precise Pangolin. But
  
  9932   Thu May 8 17:00:56 2014 rana, QSummaryLSCREFL_DC handoff didn't work last nightLast
night after checking cabling and turning
on ISS, we tried several times to handoff
  
  9934   Fri May 9 01:36:28 2014 ranaSummarySUSOptical Lever QPD Sum trends: they're almost all too weak We want there to be ~16000 cts of
signal per quadrant on the optical levers.
I think that most of the QPDs have been modified
 OLtrend.png 
  9936   Fri May 9 04:51:13 2014 ericqSummaryLSCREFL_DC handoff didn't work last night

    

       
            
  
  9942   Mon May 12 22:42:19 2014 ranaSummarySUSOptical Lever QPD Sum trends: they're almost all too weakFor some reason or another, I decided that
we should see if the optical lever servos
were injecting too much noise into the test
 OL-FB.pngarms_140512.pdf 
  9943   Mon May 12 22:52:59 2014 JenneSummarySUSOptical Lever Filters are all differentWe need to go back and have a look at all
of our optical lever control filters, and
make sure they make sense. 
 OpLevFilters.pdf 
  9946   Tue May 13 13:27:58 2014 SteveSummarySUSOptical Lever Servos setting table

    

       
            
 OLsums.png 
  9947   Tue May 13 17:03:05 2014 SteveSummarySUSETMX oplev laser replaced

    

       
            
  
  9948   Tue May 13 17:31:32 2014 JenneSummarySUSETMX oplev laser replaced: New oplev gains setI took loop measurements of ETMX pit and
yaw, and set the upper UGF to be ~6Hz for
both.  This required a pitch gain of
 OLerr_13May2014.pdfOLfb_13May2014.pdf 
  9950   Tue May 13 22:55:57 2014 JenneSummarySUSETMX oplev: cleanupI believe that the Xend aux laser was turned
off earlier today, for Steve's work swapping
out the oplev.  When I went down there,
  
  9952   Wed May 14 10:04:06 2014 SteveSummarySUS oplev laser and temperature ETMX oplev qpd gain has to be increased.
 
 TempRules.png 
  9973   Tue May 20 09:12:25 2014 SteveSummarySUSETMX oplev qpd board

    

       
            
 ETMXOLQPD121.jpgETMXOLQPDface121.jpgETMXolSUM.png 
  9975   Tue May 20 15:54:39 2014 ranaSummarySUSETMX oplev qpd board This QPD circuit (D980325-C1 )
uses the nice OP497 Quad FET opamp as the
transimpedance amplifier. It has a low enough
  
  10009   Mon Jun 9 10:55:48 2014 NichinSummaryElectronicsBBPD D1002969-v8 transimpedence measurementMy SURF
week-1 work...
 PD_transimpedence_measurement.pngresults.pdfcode_and_data.zip 
  10012   Mon Jun 9 16:55:31 2014 KojiSummaryElectronicsBBPD D1002969-v8 transimpedence measurementHow is the modulation depth assumed in
the calculation?
If you don't know the modulation
  
  10042   Mon Jun 16 12:58:50 2014 manasaSummaryIOORingdown recap A recap of the ringdown measurements made
at the 40m in mid 2012, the hardware that
was installed for the same and results from
 Ringdown_815.pdfMCringdown_cum.pdfcum_plot.png 
  10043   Mon Jun 16 15:32:12 2014 ranaSummaryIOORingdown recap  
To do this better:
1) Just step the analog input
  
  10097   Wed Jun 25 02:01:21 2014 NichinSummaryGeneralWeekly Report Attached is the weekly work plan / equipment requirement
/ lab expert's presence needed for
 Nichin_Week4_update.pdf 
  10193   Mon Jul 14 13:03:23 2014 AkhilSummaryElectronicsTiming Issues of Mini Circuits UFC-6000: SolvedMain
Problem:
The frequency counter (FC) takes
 0.2timinganalysis.png0.3timinganalysis.png0.5timinganalysis.png1stiminganalysis.pngpdf.zip 
  10194   Mon Jul 14 14:28:27 2014 KojiSummaryElectronicsTiming Issues of Mini Circuits UFC-6000: SolvedLooks good. Now you have the internal timer
to verify the external clock. 
If you can realize the constant rate
  
  10199   Tue Jul 15 01:31:13 2014 AkhilSummaryElectronicsTiming Issues of Mini Circuits UFC-6000: SolvedThe attached are the PSD plots with improved
FC timing(with the same code as in http://nodus.ligo.caltech.edu:8080/40m/10151).
More plots(Phase and PSD) to follow.
 qnoise.pngqnoise.pdf 
  10209   Wed Jul 16 01:18:02 2014 ranaSummaryLSCPython Wavelet peak finding for dramatic ALS - Red Resonance finding speedupNew script called scripts/ALS/findRedResonance.py
finds the IR resonance in less than 20 seconds.

    Do a ~2 FSR scan of the
 findRedResonance.pdf 
  10211   Wed Jul 16 01:35:16 2014 KojiSummaryLSCPython Wavelet peak finding for dramatic ALS - Red Resonance finding speedupFrom the last plot:
- Subtracting the offset of 0.0095,
the modulation depth were estimated to be
  
  10219   Wed Jul 16 19:38:37 2014 manasaSummaryPSLAOM alignment issues and removed from beam pathAOM removed
from the beampath and PMC relocked. 
 AOMremoved.jpg 
  10222   Wed Jul 16 22:17:40 2014 AkhilSummaryElectronicsBode Plots and complete Characterization of Frequency CounterGoal:
To estimate the transfer function
and the noise in the FC that is a part of
 Phase_Data.zipBode100MHz.png 
  10223   Wed Jul 16 23:02:16 2014 KojiSummaryElectronicsBode Plots and complete Characterization of Frequency CounterIf I assume 1sample delay for 0.1s sampling
rate, the delay is Exp[-I 2 pi f T], where
T is the sampling period.
  
  10238   Fri Jul 18 17:10:57 2014 NichinSummaryElectronicsCharacterization of demodulator boards.Rack 1Y2, I took transfer function measurements
for each of the following demodulator boards:
REFL11, REFL33, REFL55, REFL165, AS55, POP22,
 Demodulators_TF.pdf 
  10239   Fri Jul 18 19:32:50 2014 AkhilSummaryElectronicsFilters used inside the Frequency Counter 
 Thanks Koji , for your  hint
for the brain teasing puzzle. I was looking
 TheoreticalGainPlot.pngTFexpected.png 
  10246   Mon Jul 21 12:16:27 2014 AkhilSummaryElectronicsFilters used inside the Frequency CounterThe expected bode plots for such
a filter with L= 4 is attached and compared
 FC_TF_Characterization.png 
  10248   Mon Jul 21 17:32:43 2014 ericqSummaryLSCArm losses

    

       
            
  
  10252   Tue Jul 22 15:50:35 2014 NichinSummaryElectronicsCharacterization of demodulator boards.

    

       
            
 Demodulators_TF.pdf 
  10298   Wed Jul 30 15:33:48 2014 AkhilSummaryGeneralCalibrated Thermal Actuator TFs The goal of the measurements we made
( my previous 3 elogs) was to characterize
the laser frequency thermal actuator that
 Y_Arm_TA_TF.pdfX_Arm_TA_TF.pdfY_Arm_TA_with_fit.pdfX_Arm_TA_with_fit.pdf 
  10304   Thu Jul 31 11:54:54 2014 AkhilSummaryElectronicsPZT Calibration Koji asked me to get the calibration
of the PZT counts to Volts for the the X
and Y ends. Yesterday, I went inside the
 PZT_Y_Calibration.pdfPZT_X_Calibration.pdf 
  10306   Thu Jul 31 12:23:38 2014 KojiSummaryElectronicsPZT Calibration1) Don't be brainless. Redo the fitting
of the Y arm. Obviously the fit is not good.
2) How can you explain the value
  
  10307   Thu Jul 31 14:23:28 2014 AkhilSummaryElectronicsPZT Calibration 
 The PZT seems to saturate at
around +/- 3500 counts. So for the Y arm,
 PZT_Y_Calibration.pdf 
  10317   Fri Aug 1 01:57:24 2014 KojiSummaryIOOMC auto lockerTo make MC auto locker running correctly,
mcdown and mcup were revised
I tried it by unlocking MC several
  
  10318   Fri Aug 1 03:49:26 2014 KojiSummaryGeneralKoji - to do- Put the circuit diagram of the
sum amp on/in the circuit enclosure and associate
it with an elog [done].
  
  10319   Fri Aug 1 08:55:34 2014 KojiSummaryIOOMC auto lockerIt seems that the MC auto locker and the
FSSSlow PID servo survived a night.
PC Drive is still angry occasionally.
 MC.png 
  10320   Fri Aug 1 10:40:48 2014 KojiSummaryIOOMC servo summing ampThe
summing amp is prepared to allow up to use
bipolar full range of the FSS box output
 Fast_PZT_IF.PDF 
  10322   Fri Aug 1 12:49:06 2014 KojiSummaryIOOMC servo analysisReasoning to choose the current parameters:
FSS Common: 18dB
FSS Fast: 20dB
 MC_OLTF.pdfMC_Error_Common.pdfMC_Crossover.pdfMC_CLTF_Fast.pdf 
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