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ID Date Author Typedown Category Subject Text Attachments
  8000   Tue Feb 5 10:09:08 2013 yutaSummaryGeneralrough analysis of aligned PRM-PR2 mode scanstdev of [0.764, 0.751] is 0.007, but what
we need is the error of the averaged number.
Statistical error of the averaged number
  
  8002   Tue Feb 5 11:30:19 2013 KojiSummaryGeneralrough analysis of aligned PRM-PR2 mode scanMakes sense. I mixed up n and n-1
Probability function: X = (x1 + x2
+ ... + xn)/n, where xi = xavg +/- dx
  
  8005   Tue Feb 5 19:16:22 2013 JamieSummaryGeneralarbcav of PRC with +600 RoC PR2/3This is just a simple rerun of arbcav from
#7995
but with the PR2/3 RoCs set to 600, instead
 mode_density_PRC_3.pdfmode_density_PRC_2.pdf 
  8006   Tue Feb 5 19:32:47 2013 yutaSummaryGeneralPR2/PR3 flipping and PRC stabilityWe are considering of flipping PR2 and/or
PR3 to make PRMI stable because PR2/PR3 seems
to be convex.
 PRMI_PR2HR_PR3HR.pngPRMI_PR2AR_PR3HR.pngPRMI_PR2HR_PR3AR.pngPRMI_PR2AR_PR3AR.png 
  8012   Wed Feb 6 15:20:55 2013 yutaSummaryGeneralFWHM was wrongI have to blame Jamie for putting extra
2 randomly.
Measured PRM-PR2 cavity 
  
  8022   Thu Feb 7 12:56:18 2013 JamieSummaryGeneralPRC/arm mode matching calculationsNOTE:
There was a small bug in my initial calculation. 
The plots and numbers have been updated with
 8x 
  8025   Thu Feb 7 17:10:11 2013 KojiSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  8029   Fri Feb 8 00:23:33 2013 ranaSummaryGeneralPRC/arm mode matching calculations 
 I would guess that either flipping
PR2 or PR3 would give nearly the same effect
  
  8033   Fri Feb 8 11:07:07 2013 JamieSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  8035   Fri Feb 8 12:42:45 2013 nicolasSummaryGeneralPRC/arm mode matching calculations

    

       
            
  
  8040   Fri Feb 8 18:23:32 2013 JamieSummaryGeneralarbcav of half PRC with flipped PR2Arbcav with half PRC (flat temporary mirror
in front of BS), PR2 RoC = 600m, PR3 RoC
= -600m:
 prm23t-modes.pdfprm23t-geometry.pdf 
  8041   Fri Feb 8 19:29:44 2013 yutaSummaryGeneralarbcav of half PRC with flipped PR2We need expected finesse and g-factor to
compare with mode-scan measurement. Can you
give us the g-factor of the half-PRC and
  
  8048   Fri Feb 8 23:22:48 2013 DenSummaryModern Controlprogress report I wrote a small document on the application
of LQG method to a Fabry-Perot cavity control.
 LQG.pdf 
  8053   Sun Feb 10 18:00:13 2013 yutaSummaryLSCPR2-flipped half-PRC spectra/OLTFTo compare with future PRMI locking, I
measured spectra of POPDC and feedback signal.
I also measured openloop transfer function
 POPDCLSCPRM.pngLSCPRCLOLTF.png 
  8054   Mon Feb 11 12:49:54 2013 JenneSummaryLSCResonant freq change - why? (and passive TT mode freqs)

    

       
            
  
  8059   Mon Feb 11 17:17:30 2013 JamieSummaryGeneralmore analysis of half PRC with flipped PR2

    

       
            
 foo.pdf 
  8060   Mon Feb 11 17:54:02 2013 KojiSummaryOpticsCurvature radii of the G&H/LaserOptik mirrorsI, by chance, found  that my windows
partition has Vision32 installed.
So I run my usual curvature characterization
 TT_Mirrors_RoC.pdf 
  8068   Tue Feb 12 18:25:43 2013 JamieSummaryGeneralhalf PRC with astigmatic PR2/3

    

       
            
  
  8069   Tue Feb 12 18:28:46 2013 JamieSummaryOpticsCurvature radii of the G&H/LaserOptik mirrors

    

       
            
  
  8074   Wed Feb 13 01:26:08 2013 yutaSummaryGeneralrough analysis of aligned PRM-PR2 mode scanKoji was correct.

When you estimate the variance of
 unbiased.png 
  8078   Wed Feb 13 19:09:32 2013 yutaSummaryGeneralpossible explanations to oval REFL beam[Jenne, Manasa, Jamie, Yuta]

The shape of the REFL beam reflected
 REFL_1044844506.bmp 
  8079   Wed Feb 13 19:30:45 2013 KojiSummaryGeneralpossible explanations to oval REFL beam>> "What has changed since:"
Recently
the REFL path has been rearranged
  
  8080   Wed Feb 13 19:41:07 2013 yutaSummaryGeneralpossible explanations to oval REFL beamWe checked that REFL beam is already oval
in the vacuum. We also centered in-air optics,
including lens, in the REFL path, but REFL
  
  8082   Thu Feb 14 00:10:12 2013 yutaSummaryAlignmentREFL is not clippedLet's wait for astigmatism calculation.

In either case(clipping or astigmatism),
  
  8084   Thu Feb 14 10:42:41 2013 JamieSummaryAlignmentMMT, curved TTs does not explain beam ellipticity at FaradayAfter using alamode to calculate the round-trip
mode of the beam at the Faraday exit after
retro-reflection form the PRM, I'm not able
 T.pdfS.pdf 
  8085   Fri Feb 15 01:41:02 2013 Manasa, YutaSummaryAlignmentIFO aligned and ready for PRMI locking[Yuta, Manasa, Jenne, Jamie, Steve]
IFO aligned and ready for
  
  8086   Fri Feb 15 01:51:43 2013 JenneSummaryAlignmentIFO aligned and ready for PRMI locking 
Yuta and Manasa, you guys are awesome!
Small, inconsequential point: 
  
  8094   Sat Feb 16 18:32:01 2013 yutaSummaryRF Systemphase tracker: OLTFI measured openloop transfer function of
the phase tracking loop for the first characterization
of phase tracker.
 BEATXFINEPHASE_OLTF.pngBEATYFINEPHASE_OLTF.pngphasetracker.png 
  8125   Wed Feb 20 23:25:50 2013 ZachSummaryElectronicsReplacement for the AD743: OPA140 and OPA827I have found two great FET input chips  ULN_opamp_comparison_2_20_13.png 
  8142   Sat Feb 23 00:36:52 2013 ManasaSummaryLockingMC locked[Yuta, Manasa, Sendhil, Rana]

With MC REFL PD fixed, we aligned
 MCdecenter_23Feb2013.png 
  8151   Sat Feb 23 18:01:38 2013 ZachSummaryElectronicsReplacement for the AD743: OPA140 and OPA827Rana suggested that I measure the OPA827
and OPA140 noise with high source impedance
so as to see if we could find the low-frequency
 OPA140_OPA827_noise_vs_Rs.pngScreen_Shot_2013-02-24_at_12.12.23_PM.pngScreen_Shot_2013-02-24_at_12.12.43_PM.png 
  8153   Sun Feb 24 16:49:00 2013 ranaSummaryElectronicsReplacement for the AD743: OPA140 and OPA827  This looks pretty good already.
Not sure if we can even measure anything
reasonable below 0.1 Hz without a lot of
  
  8156   Mon Feb 25 13:01:39 2013 KojiSummaryGeneralQuick, compact, and independent tasks- IMC PDH demodulation phase adjustment
- Permanent setup for green transmission
DC PDs  on the PSL table
  
  8164   Mon Feb 25 22:42:32 2013 yutaSummaryAlignmentcurrent IFO situation[Jenne,Yuta]

Both arms are aligned starting from
 IPANGdrift.png 
  8211   Sat Mar 2 00:23:19 2013 ranaSummaryCOCPhase Maps measured of the ATF flat mirrorsI took the two 'flat' 2" mirrors over
to Downs and Garilynn showed me how to measure
them with the old Wyko machine.
 0966_0997_phasemap.pdf 
  8242   Wed Mar 6 18:14:33 2013 ManasaSummaryLSCCalibration of BS, ITMX and ITMY actuators[Yuta, Manasa]

Measured
 MICHerrCalibration.pngMICHerrCalibration.pngMICHOLTF.pngactcalibITMBS.png 
  8266   Mon Mar 11 10:20:36 2013 Max HortonSummaryComputersAttempted Smart UPS 2200 Battery ReplacementAttempted Battery Replacement on Backup
Power Supply in the Control Room: 
I tried to replace the batteries
 upsB.jpgupsBa.jpg 
  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:
  
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