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ID Date Authordown Type Category Subject Text Attachments
  2579   Mon Feb 8 15:41:51 2010 AlbertoUpdateABSLSuddenly a much better alignment of PRC

    
        
  
  2581   Tue Feb 9 09:07:06 2010 AlbertoUpdateABSLPLL Characterization

    
        
 2010-02-08_PRCtransmissivity_EntireFreqRange_VsFit.png 
  2582   Tue Feb 9 10:10:58 2010 AlbertoUpdateABSLback to analogI want to try to do the measurement with
the network analyzer used as local oscillator,
instead of the Marconis that I'm using now.
  
  2604   Tue Feb 16 09:51:22 2010 AlbertoUpdateGreen Lockingtake some optics away from the ETM end table


   
        
            
  
  2605   Tue Feb 16 10:01:16 2010 AlbertoConfigurationLSCArms and PRC not lockingSince last Friday either the arms or the
PRC can't lock.
The montors show the beam flashing
  
  2608   Tue Feb 16 15:25:00 2010 AlbertoConfigurationLSCArms and PRC not locking 
 
 shock.jpg 
  2640   Thu Feb 25 15:49:05 2010 AlbertoAoGCDSNew IO Chassis for the new CDSYesterday Kiwamu and I went to Downs
to take all the available parts of the IO
chassis that Gary and I had put together
  
  2653   Wed Mar 3 18:32:25 2010 AlbertoUpdate40m Upgrading11 MHz RFPD elctronics** Please
add LISO file w/ component values.
 
 rfpd11_v2_TF.pdfrfpd11_v2_Noise.pdf 
  2655   Thu Mar 4 08:43:35 2010 AlbertoUpdate40m Upgrading11 MHz RFPD elctronics


   
        
            
 rfpd11_v2.fil 
  2656   Thu Mar 4 19:53:56 2010 AlbertoUpdate40m Upgrading11MHz PD designed adjusted for diode's resistance; 55 MHz RFPD designedAfter
reading this study done
 6x 
  2680   Thu Mar 18 12:27:56 2010 AlbertoUpdateABSLPLL reconstructed


   
        
            
  
  2702   Tue Mar 23 15:38:26 2010 AlbertoUpdateelogelog just restarted I found the elog down and I restarted it.
Then, after few seconds it was down
again. Maybe someone else was messing with
  
  2704   Tue Mar 23 22:46:43 2010 AlbertoUpdate40m UpgradingREFL11 upgradedI modified REFL11 according to the changes
lsited in this
schematic (see wiki  / Upgrade 09
 2010-03-23_REFL11_model_to_meas_comparison.png 
  2710   Wed Mar 24 14:52:02 2010 AlbertoUpdateGreen Lockingtwo NPRO PLL


   
        
            
  
  2711   Wed Mar 24 14:57:21 2010 AlbertoUpdate40m UpgradingREFL11 upgraded 
 Hartmut suggested a possible
explanation for the way the electronics transfer
  
  2715   Thu Mar 25 17:32:42 2010 AlbertoUpdate40m UpgradingREFL55 UpgradedI upgraded the old REFL199 to the new REFL55.
To do that I had to replace the old
photodiode inside, switching to a 2mm one.
 2010-03-25_REFL55_model_to_meas_comparison.png2010-03-25_REFL55_model_to_meas_comparison.png 
  2732   Mon Mar 29 21:43:27 2010 AlbertoConfigurationPSLReference Cavity PD Noise Spectrum[Rana, Alberto]
This evening we measured the noise
spectrum of the reference cavity PD used
 2010-03-29_FSS_PD_shotnoise_and_darknoise.png2010-03-29_FSS_PD_shotnoise_and_darknoise.png 
  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
  
  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 
  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 
  2763   Sun Apr 4 17:32:07 2010 AlbertoMetaphysicsGeneralnew y-arm?


   
        
            
  
  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 
  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
  
  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,
  
  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
  
  2776   Tue Apr 6 16:55:28 2010 AlbertoUpdateComputer Scripts / ProgramsData formats in the Agilent AG4395a Spectrum Analyzer


   
        
            
  
  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 
  2781   Wed Apr 7 11:11:19 2010 AlbertoUpdateElectronicsREFL11 Noise Simulation


   
        
            
 rfpd11_testinput_noiseplot.pdf 
  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 
  2783   Thu Apr 8 10:24:33 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
  
  2785   Fri Apr 9 06:45:28 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
  
  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.
  
  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 
  2790   Mon Apr 12 17:09:30 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
 2010-04-09_REFL11NoiseMeasurements.png 
  2834   Thu Apr 22 21:42:24 2010 AlbertoUpdatePSLInnolight 2W Vertical Beam Profile 
 What kind of fit did you use?
How are the uncertainties in the parameters
  
  2856   Wed Apr 28 14:15:58 2010 AlbertoUpdateIOOMC alignment 
 That's interesting.
Would it be possible to write about
  
  2874   Mon May 3 19:21:43 2010 AlbertoDAQEnvironmentBoot fest[Alberto, Koji, Rana]
The RFM network failed today. We
had to reboot the frame builder anf restart
  
  2882   Wed May 5 16:32:39 2010 AlbertoUpdate40m UpgradingNew REFL55 PD, 11MHz rejectionHere's the (calibrated) transimpedance
of the new REFL55 PD.
T(55.3) / T_(11.06) = 93 dB
 2010-05-05_REFL55_CalibratedOpticalResponse0-60MHz.png 
  2886   Thu May 6 16:18:37 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiodeAfter munching analytical models, simulations,
measurements of photodiodes I think I got
a better grasp of what we want from them,
 pox11.pdf 
  2893   Thu May 6 19:57:26 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiode


   
        
            
 pox11.pdf 
  2896   Fri May 7 18:18:02 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiode


   
        
            
  
  2902   Mon May 10 16:59:35 2010 AlbertoUpdate40m UpgradingUnexpected oscilaltionin the POY11 PDThe measured transimpedance of the latest
POY11 PD matches my model very well up to
100 MHz. But at about ~216MHz I have a resonance
 2010-05-10_POY11_CalibratedOpticalResponse0-500MHz.pngPOX11.png 
  2906   Mon May 10 19:29:33 2010 AlbertoHowToElectronicsNew Focus 1811 PD calibrated against New Focus 1611 PDI measured the output impedance of the
New Focus 1611 PD (the 1GHz one) and it is
50 Ohm for both the DC and the AC output.
  
  2924   Wed May 12 17:10:16 2010 AlbertoUpdate40m UpgradingRF frequency generation box - step 0I started putting together the components
that are coint to go inside the frequency
generation box. Here's how it looked like:
 DSC_1499_small.JPG 
  2925   Wed May 12 23:31:17 2010 AlbertoUpdate40m Upgrading216 MHz resonance in the POY11 PD killedIt turned out that the resonance at 216
MHz in the 11MHz PD that I showed in the
elog entry 2902
 POX11.png2010-05-12_POY11_CalibratedOpticalResponse0-500MHz.png 
  2966   Fri May 21 11:56:34 2010 AlbertoUpdate40m Upgrading40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue.I update my old 40mUpgrade Optickle model,
by adding the latest updates in the optical
layout (mirror distances, main optics transmissivities,
 7x 
  2969   Fri May 21 16:27:45 2010 AlbertoOmnistructureEnvironmentThe control room is molding...... not just because we haven't locked
the interferometer for quite some time. I
mean, it literally stinks. The chiller's
  
  2994   Wed May 26 17:10:09 2010 AlbertoUpdate40m UpgradingRF Generation boxThis is how the RF generation box might
soon look like:
 Visio-frequencyGenerationBox_wiringSchematic.png 
  2996   Wed May 26 22:22:03 2010 AlbertoConfiguration40m UpgradingArm cavity lengthThe second sideband is resonant in the
arms for a cavity length of 37.9299m.
The nearest antiresonant arm lengths
 reflRFpowerVsArmLength_3658m.pngreflRFpowerVsArmLength_3750m.png 
  3001   Thu May 27 12:52:02 2010 AlbertoUpdate40m UpgradingArm lengths
For both sidebands to be antiresonant
in the arms, the first modulation frequency
  
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