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ID Date Author Type Categoryup Subject Text Attachments
  4167   Wed Jan 19 04:25:54 2011 KevinUpdateElectronicsPOX Transfer FunctionsI redid the optical POX transfer functions
and updated the wiki at http://lhocds.ligo-wa.caltech.edu:8000/40m/Electronics/POX.
I measured each transfer function
  
  4169   Wed Jan 19 10:45:00 2011 KojiUpdateElectronicsPOX Transfer FunctionsTF looks fine except for the large peak
at around 200MHz which has been reported
by Rana. The time series and the spectrum
  
  4170   Wed Jan 19 17:00:23 2011 KevinUpdateElectronicsPOX Transfer Functions The value of I_dc was a mistake.
The value should be 240 µA.
The widths of the resonance peaks
  
  4172   Thu Jan 20 01:50:30 2011 KevinUpdateElectronicsPOX Transfer Functions[Koji, Kevin]
We fit the entire POX optical transfer
function from 1 MHz to 500 MHz in LISO. The
  
  4210   Thu Jan 27 03:24:56 2011 KevinUpdateElectronicsPOY Optical Transfer Function[Rana and Kevin]
I measured the optical transfer function
of POY and fit the data using LISO. The fit
 tf_pox_poy.pnglinearity.png 
  4242   Thu Feb 3 01:46:54 2011 KevinUpdateElectronicsPOY Shot Noise and Dark Spectrum[Koji and Kevin]
I measured the shot noise of POY
and fit the data to determine the RF transimpedance
  
  4243   Thu Feb 3 04:43:58 2011 SureshUpdateElectronicsAdded two new DAQ channels[Suresh, Joe]
We added the following two new DAQ
channels into the c1:GCV model.  The
  
  4244   Thu Feb 3 11:13:52 2011 KojiUpdateElectronicsPOY Shot Noise and Dark SpectrumI wonder why POY11 has the dark noise level
of 90nV/rtHz that is  5 times larger than
that of POX (18nV/rtHz)
  
  4254   Sat Feb 5 23:03:04 2011 rana, kojiSummaryElectronicsAnalog Frequency Discriminator: splitter + mixer + long cableThis diagram shows the setup  mixer.pdfUntitled.pngfsm.png 
  4255   Sun Feb 6 02:29:28 2011 ranaUpdateElectronicsAnalog MFD: longer cableI swapped over to a 3x longer cable (old
65 ft. Pasternak cable from ancient 40m days).
The old one was 6m, the new one is 18.2 m.
 mfd18.png 
  4272   Fri Feb 11 00:20:58 2011 SureshUpdateElectronicsREFL11: Photodiode requires replacement 
This is with reference to Kevin and
Jenne's elogs  # 3890,
 REFL11_10Feb2011.jpg 
  4275   Sat Feb 12 08:08:05 2011 SureshUpdateElectronicsREFL11 Photodiode replacedA new photodiode ( Perkin and Elmer Model
no. C30642GH Sl No.1526) has been installed
in the place of the old photodiode. 
 C30642_datasheet-1.pdf40mUpgradeREFL11schematic.pdfP2120572.JPGP2120565.JPGP2120571.JPG 
  4276   Sat Feb 12 23:22:21 2011 ranaUpdateElectronicsREFL11 Photodiode replaced375 mW is way too much light. We must never
put more than 100 mW on any of these diodes.
We don't want to blow up more diodes like
  
  4277   Sun Feb 13 02:33:37 2011 KojiUpdateElectronicsREFL11 Photodiode replacedSuresh is saying 375mW and 0.375mW. Let's
wait for his update of the actual power.
Also he is not using EPICS, there
  
  4279   Sun Feb 13 16:20:53 2011 SureshUpdateElectronicsREFL11 Photodiode replacedIt is 0.375 mW as in the calculation. 
The total diode output is just 1mW and it
is divided with a 50/50 beam splitter... 
  
  4281   Mon Feb 14 00:39:21 2011 rana, sureshUpdateElectronicsVCO Frequency Noise Measurement with the MFDWe hooked up the VCO Driver output to the
MFD. We adjusted the levels with attenuators
to match up to the Level 7 mixer that's being
  
  4284   Mon Feb 14 07:37:13 2011 SureshUpdateElectronicsRF Generation Box: capacitors across power lines 
There were several parts in this
box which did not have shunting capacitors
  
  4315   Thu Feb 17 14:17:27 2011 SureshUpdateElectronicsRF Distribution box and REFL11 
The Distribution box is several steps
nearer to completion.
  
  4318   Thu Feb 17 23:11:40 2011 ranaUpdateElectronicsVCO Frequency Noise Measurement with the MFDThis is the 140 ft. MFD measurement of
the VCO phase noise. It is open loop
and so should be a good measurement. The
 vco.png 
  4328   Fri Feb 18 20:17:07 2011 JoonhoSummaryElectronicsIsolation of Voltage regulatorToday I was working on RF distribution
box.
So far I almost finished to electronically
  
  4329   Sat Feb 19 01:58:20 2011 ranaSummaryElectronicsLow Noise BJT Pre-AmpFrank put his low noise preamp info here.
I suggest that we build these (using
  
  4330   Sat Feb 19 05:25:20 2011 SureshUpdateElectronicsRF: Distribution boxMost of the RF cables required for the
box are done.   There are two remaining
and we will attend to these tonight. 
  
  4336   Tue Feb 22 00:41:34 2011 SureshUpdateElectronicsRF Distribution box: assembly completedThe mechanical assembly of RF distribution
box is 99% complete.  Some of the components
may be bolted to the teflon base plate if
  
  4337   Tue Feb 22 11:53:38 2011 steveUpdateElectronicsRF Distribution box: assembly completed


   
        
            
  
  4342   Wed Feb 23 08:53:58 2011 SureshUpdateElectronicsRF Distribution box: Output power levelsWe wish to have roughly 2 dBm of output
power on each line coming out of the RF distribution
box.  So I adjusted the attenuators
 RF_Distribution_box_23rdFeb.jpg 
  4347   Thu Feb 24 00:54:33 2011 KevinUpdateElectronicsCalculated Dark Noise for POX and POY[Kevin, Rana, Koji]
I calculated the dark noise of POX
and POY due to Johnson noise and voltage
  
  4358   Fri Feb 25 14:35:06 2011 Larisa ThorneUpdateElectronicsTotal harmonic distortion results for +7dBm mixer This experiment deals with measuring
the total harmonic distortion (THD) contribution
 THDcircuit.jpgPhoto_on_2011-01-17_at_12.25.pngTHDwithoutamp.pdf 
  4370   Wed Mar 2 22:04:22 2011 KevinUpdateElectronicsPOY Shot Noise MeasurementThe previous measurement for the shot noise
of POY had the dark noise at ~100 nV/rtHz.
I redid the measurement and got 26 nV/rtHz
  
  4374   Thu Mar 3 18:32:33 2011 Larisa ThorneUpdateElectronicsHarmonic distortion calculations for RF distribution boxFinished calculations for harmonic distortion
at each of the 10 outputs of the RF distribution
box. The diagram can be found on Suresh's
 RFdistribboxcalcs.pdf 
  4377   Fri Mar 4 09:47:46 2011 SureshUpdateElectronicsHarmonic distortion calculations for RF distribution box 
Fast work indeed! It would be nice
if we could have the following details filled
  
  4395   Thu Mar 10 01:31:37 2011 KevinUpdateElectronicsAS55 CharacterizationsI measured the transfer function, shot
noise, and dark spectrum of AS55.
From the shot noise measurement,
  
  4402   Thu Mar 10 17:03:48 2011 Larisa ThorneConfigurationElectronicscalculations for passive low pass filter on X arm[Kiwamu, Larisa] 
 
We want to increase gain in the lower
  
  4434   Wed Mar 23 16:06:20 2011 Larisa ThorneUpdateElectronicsUpdate on cable laying [Steve, Suresh, Larisa]
The following cables were laid today:
ETMYT, ETMY, IFOPO, MC1, OMCR, AS Spare,
  
  4456   Tue Mar 29 15:01:58 2011 Larisa ThorneUpdateElectronicsLow pass filter for X arm laser temperature control This is the continuation of http://nodus.ligo.caltech.edu:8080/40m/4402
 
 DSC_2889.JPGLPFgraph.pdf 
  4457   Tue Mar 29 15:50:21 2011 KojiUpdateElectronicsLow pass filter for X arm laser temperature controlFor bode plot:

USE LOG-LOG plot for the amplitude
  
  4459   Wed Mar 30 02:55:02 2011 SureshConfigurationElectronicsRF System : Status and PlansI have prepared several diagrams outlining
the current state of the RF System.
These are uploaded into the svn40m
  
  4492   Wed Apr 6 16:02:07 2011 Larisa ThorneUpdateElectronicsCable laying...continued[Steve, Kiwamu, Larisa]
 
Having finished laying new cable
  
  4507   Mon Apr 11 09:49:53 2011 ranaUpdateElectronicsNew Green PD test1 Ooh. Can you explain the purpose
of the resistors which are connected to the
(+) inputs? It looks like some real electronics
  
  4508   Mon Apr 11 11:34:05 2011 KojiUpdateElectronicsNew Green PD test1

    

       
            
 SGD444A_240_test.png 
  4512   Mon Apr 11 20:03:05 2011 taraUpdateElectronicsTTFSS for 40mI brought TTFSS set #7 to 40m and kept
it in the electronic cabinet.
note that Q4 transistor has not been
  
  4513   Mon Apr 11 21:13:15 2011 KojiUpdateElectronicsNew Green PD test1Correction:
The (-) input has been decoupled
by the capacitor. So the series resistance
  
  4519   Wed Apr 13 16:38:17 2011 Larisa ThorneUpdateElectronicsVideo MUX camera/monitor check [Kiwamu, Larisa]
 
The following Video MUX inputs(cameras)
  
  4531   Fri Apr 15 13:40:00 2011 Larisa ThorneUpdateElectronicsLow pass filter for X arm laser temperature control, second tryPlotting the data points yielded by the
spec analyzer of my first LPF yielded a result
that was not expected: the desired cutoff
 Bode2.jpegBode100k.jpg 
  4568   Tue Apr 26 01:20:02 2011 ranaUpdateElectronicsPOX_11 debuggingThe performance plots for   
  4569   Tue Apr 26 22:03:49 2011 ranaUpdateElectronicsPOX_11 debuggingI used the Jenne AM laser to tune up the
PD (used to be POX_11 but now is called REFL_11).
In addition to the notch at 22 MHz, I have
 MM7.png 
  4572   Wed Apr 27 15:34:38 2011 kiwamuUpdateElectronicsAS55 demod board with new 90 deg splitter : healthy
A new 90 deg splitter, PSCQ-2-51W,
  
  4573   Wed Apr 27 17:38:01 2011 kiwamuUpdateElectronicsRe : AS55 demod board with new 90 deg splitter : healthy   relativephase.pngIQamplitude.png 
  4601   Mon May 2 21:14:55 2011 kiwamuUpdateElectronicstoo loose Heliax connectors on 1Y2 rackI found that
all the Heliax cables landing on the bottom
 DSC_2982_ss.jpgDSC_2984_ss.jpg 
  4602   Mon May 2 23:29:57 2011 SureshUpdateElectronicstoo loose Heliax connectors on 1Y2 rackThe countersink
gives rise to another problem when we mount
the N-type-to-SMA bulkhead adaptor. 
  
  4612   Tue May 3 14:35:44 2011 Larisa ThorneConfigurationElectronicsJenne-Seismometer LPF project I was charge with making a Non-Inverting
Op Amp Low Pass Feedback circuit for Jenne,
which may somehow be integrated into a seismometer
 SeisLPFdiagram.jpgseisLPF.Bose.jpg 
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