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ID Date Author Type Category Subject Text Attachments
  2789   Mon Apr 12 16:20:05 2010 AlbertoConfiguration40m UpgradingREFL55 improvedDuring the commissioning of the AS55
PD, I learned how to get a much better rejection
of the 11MHz modulation.
So I
 2010-04-12_REFL55_TF_model_to_meas_comparison.png 
  2788   Mon Apr 12 14:20:10 2010 kiwamuUpdateGreen LockingPZT response for the innolightI measured a
jitter modulation caused by
  
  2787   Sun Apr 11 19:05:34 2010 KojiOmnistructureComputersWhere are the laptops?One dell is in the clean room for the suspension
work.

  
  2786   Sun Apr 11 13:51:04 2010 AlbertoOmnistructureComputersWhere are the laptops?I can't find the DELL laptop anywhere in
the lab. Does anyone know where it is?
Also one of the two netbooks is missing.
  
  2785   Fri Apr 9 06:45:28 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
  
  2784   Thu Apr 8 20:53:13 2010 KojiUpdate40m UpgradingREFL11 Noise Vs PhotocurrentSomething must be wrong. 
1. Physical Unit is wrong for the
second term of "Vn = Vdn + Sqrt(2 e
  
  2783   Thu Apr 8 10:24:33 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
  
  2782   Thu Apr 8 10:17:52 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs PhotocurrentFrom the measurements of the 11 MHz RFPD
at 11Mhz I estimated a transimpedance of
about 750 Ohms. (See attached plot.)
 2010_04_05_REFL11_ShotnoiseVsPhotocurrent.png 
  2781   Wed Apr 7 11:11:19 2010 AlbertoUpdateElectronicsREFL11 Noise Simulation


   
        
            
 rfpd11_testinput_noiseplot.pdf 
  2780   Wed Apr 7 10:58:15 2010 KojiUpdateElectronicsREFL11 Noise SimulationWhat??? I don't see any gray trace
of Rs in the plot. What are you talking about?
Anyway, if you are true, the circuit
  
  2779   Wed Apr 7 10:48:04 2010 AlbertoUpdateElectronicsREFL11 Noise SimulationLISO simulations confirm the estimate
of ~15nV for the noise of REFL11.
The
largest contribution comes from the 50Ohm
 rfpd11_testinput_noiseplot.pdf 
  2778   Wed Apr 7 09:00:01 2010 steveHowToPEMprepare to open chamberIn order to minimize the diffusion of more
dust particles into the vented IFO vacuum
envelope
 0.5micron.jpg 
  2777   Tue Apr 6 22:54:34 2010 KojiUpdateSUSITMY (south) alignedKiwamu and Koji
ITMY
(south) was aligned
 IMG_2362.jpg 
  2776   Tue Apr 6 16:55:28 2010 AlbertoUpdateComputer Scripts / ProgramsData formats in the Agilent AG4395a Spectrum Analyzer


   
        
            
  
  2775   Tue Apr 6 11:27:11 2010 AlbertoUpdateComputer Scripts / ProgramsData formats in the Agilent AG4395a Spectrum AnalyzerLately I've been trying to sort out the
problem of the discrepancy that I noticed
between the values read on the spectrum analyzer's
  
  2773   Mon Apr 5 14:10:06 2010 steveUpdateSUSsus damping restored

    
        
  
  2772   Mon Apr 5 13:52:45 2010 AlbertoUpdateComputersFront-ends down. RebootedThis morning, at about 12 Koji found all
the front-ends down.
At 1:45pm rebooted ISCEX, ISCEY,
  
  2771   Mon Apr 5 13:20:16 2010 KojiOmnistructureElectronicssoldering iron brokenAlbeto and Koji
We took the tip replacement from
the blue tower.
 weller_tips.jpg 
  2770   Mon Apr 5 13:07:36 2010 JenneOmnistructureElectronicssoldering iron broken


   
        
            
  
  2769   Mon Apr 5 11:39:41 2010 steveUpdateSUSITM-south installation


   
        
            
  
  2768   Mon Apr 5 10:33:12 2010 AlbertoOmnistructureElectronicssoldering iron brokenThis morning the pencil soldering iron
of our Weller WD2000M Soldering Station suddenly
stopped working and got cold after I turned
  
  2767   Mon Apr 5 10:23:40 2010 AlbertoUpdate40m UpgradingREFL11 Low Frequency Oscilaltion ReducedAfter adding an inductor L=100uH and a
resistor R=10Ohm in parallel after the OP547A
opamp that provide the bias for the photodiode
 2010_04_05_REFL11_darknoise_with_100uH_coil_10ohm_res.png2010_04_05_REFL11_darknoise_wide_freq_window_lid_open-closed.png2010_04_05_REFL11_darknoise_wide_freq_window_lid_open-closed.png 
  2766   Mon Apr 5 09:48:57 2010 KojiUpdateSUSITMs placed on the tables in the chambersSteve and Koji (Friday, Apr 02)
Summary
Intsallation of ITMs are going on.
  
  2765   Mon Apr 5 08:43:48 2010 steveUpdatePEMearthquake mag 7.2Large
earthquake shakes Baja California, Mexico
and 6 over Magnitude 5 aftershakes follow. 
 eq7.2.jpg 
  2764   Mon Apr 5 01:02:07 2010 ranaUpdatePEMGuralp interface box turned offI was
checking into the Guralp situation today.
I put the rubber balls underneath the granite
 Untitled.png 
  2763   Sun Apr 4 17:32:07 2010 AlbertoMetaphysicsGeneralnew y-arm?


   
        
            
  
  2762   Sun Apr 4 00:21:42 2010 rana, kojiSummaryElectronicsCheckout of EG&G (PARC) preamp model #113, s/n 49135We tested out the functionality of the
EG&G 113 preamp that I found in one of
the cabinets. This is one of the ancestors
 IMG_0628.JPG 
  2761   Sat Apr 3 19:54:19 2010 AlbertoUpdate40m UpgradingREFL11 and REFL55 PDs Noise SpectrumThese are the dark noise spectrum that
I measured on the 11MHz and 55MHz PD prototypes
I modified.
 2010-04-03_REFL11_darknoise.png2010-04-03_REFL55_darknoise.png 
  2760   Sat Apr 3 16:07:40 2010 AlbertoConfigurationPSLReference Cavity PD Noise Spectrum I was aware of a problem on those
units since I acquired the data. Then it
wasn't totally clear to me which were the
 2010-03-29_FSS_PD_shotnoise_and_darknoise.png 
  2759   Sat Apr 3 11:35:47 2010 ranaConfigurationPSLReference Cavity PD Noise SpectrumThe units on this
plot are completely bogus - we know that
the thermal noise from the resonant part
  
  2758   Fri Apr 2 08:52:21 2010 AlbertoUpdateelogelog restartedi just restarted the elog for the third
time in the past 12 hours.
I checked the elog.log file to debug
  
  2757   Thu Apr 1 20:29:02 2010 HartmutUpdateGreen Lockingsimple PD test circuitI made a simple PD test circuit which may
allow to test PD response up to few 100MHz.
Its not for low noise, only for characterising
 pdtest.png 
  2756   Thu Apr 1 19:59:32 2010 MottUpdateGeneralPZT response for the innolight 
 We measured the Amplitude Modulation
response of the PZTs, to find regions with
 Innolight_AM_Response.pngInnolight_AM_PM.pngInnoVsLW_PM.pngInnolight_AM_Response.pngLightwave_AM_PM.png 
  2755   Thu Apr 1 18:44:40 2010 KojiUpdateGeneralPZT response for the innolightInnolight 10 rad/V @ 100kHz => 1e6/f
rad/V => 1MHz/V
LWE 30 rad/V @ 100kHz => 3e6/f
  
  2754   Thu Apr 1 18:05:29 2010 MottUpdateGeneralPZT response for the innolight 
 We realized that we had measured
the wrong calibration value; we were using
 Innolight_Response_calFix.pngLightwave_response_calFix.png 
  2753   Thu Apr 1 17:35:24 2010 KojiUpdateSUSWorking on ITMX/YSteve and Koji
- We removed old ITMX/Y from the
chambers. Now they are temporarily placed
 IMG_2353.jpg 
  2752   Thu Apr 1 16:34:29 2010 HartmutUpdateGreen LockingSilicon PDsjust a few infos on Silicon PDs I looked
up.
If you want to go beyond the 100MHz
  
  2751   Thu Apr 1 15:21:12 2010 ranaUpdateGreen Lockingfrequency counter for green PLL 
  
  2750   Thu Apr 1 12:07:22 2010 ranaUpdateGeneralPZT response for the innolightThe Lightwave NPRO   
  2749   Thu Apr 1 10:47:48 2010 KojiUpdateGeneralPZT response for the innolightInnolight: 100rad/V @ 100kHz  =>
1e7/f rad/V => 10MHz/V
LWE: 500rad/V @ 100kHz => 
  
  2748   Thu Apr 1 10:21:58 2010 MottUpdateGeneralPZT response for the innolight


   
        
            
 Innolight_Response.pngLightwave_response.png 
  2747   Thu Apr 1 07:17:15 2010 KojiUpdateGeneralPZT response for the innolightThe shape of the TF looks nice but the
calibration must be wrong.
Suppose 1/f slope with 10^-4 rad/V
  
  2746   Thu Apr 1 00:43:33 2010 MottUpdateGeneralPZT response for the innolightKiwamu and I measure the PZT response of
the Innolight this evening from 24 kHz to
2MHz.  
 Innolight_Bode.png 
  2745   Wed Mar 31 19:29:58 2010 HartmutUpdateElectronics(1cm-) Si PD transfer functions updateRecorded transfer functions for the 1cm
Si-PD as described on p. 2708
for different biases. I put the plots
  
  2744   Wed Mar 31 16:55:05 2010 josephbUpdateComputers2 computers from Alex and Rolf brought to 40mI went over to Downs today and was able
to secure two 8 core machines, along with
mounting rails.  These are very thin
  
  2743   Wed Mar 31 16:31:44 2010 steveUpdatePEMGuralp interface box turned off

    
        
 grlpntrfcbxoff.jpg 
  2742   Wed Mar 31 15:31:53 2010 steveUpdatePSLReference Cavity RF PD base upgraded


   
        
            
 brspdbs.JPG 
  2741   Wed Mar 31 12:30:31 2010 ranaUpdateGreen Lockingfrequency counter for green PLLIts a good measurement - you should adjust
the input range of the 620 using the front
panel 'scale' buttons to see how the noise
  
  2740   Wed Mar 31 11:52:32 2010 kiwamuSummaryGreen LockingRe:conversion efficiency of PPKTPGood point. There is a trick 
to avoid a divergence.
Actually the radius of the cylindrical
  
  2739   Wed Mar 31 10:34:02 2010 josephbUpdateelogElog not responding this morningWhen I went to use the elog this morning,
it wasn't responding.  I killed the
process on nodus, and then restarted, per
  
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