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ID Date Author Type Categoryup Subject Text Attachments
  176   Mon Jan 24 15:50:38 2011 JanComputingSeismometryMulti-frequency and sphericalI had to rebuild some of the guts of my
simulation to prepare it for the big changes
that are to come later this week. So I only
 Field_SW4f3.jpgMap_10Hz_SW4f3.jpgPerformance_Spiral20_PW4f3.jpgPerformance_Spiral20_SW4f3.jpg 
  177   Tue Jan 25 11:57:23 2011 JanComputingSeismometrywaveletsHere is the hour of truth (I think). I
ran simulations of wavelets. These are not
anymore characterized by a specific frequency,
 Data_WA4f3.jpgPerf_rel_Spiral20_WA4f3.jpgPerf_abs_Spirals_WA4f3.jpg 
  178   Wed Jan 26 10:34:53 2011 JanSummarySeismometryFIR filters and linear estimationI wanted to write down what I learned from
our filter discussion yesterday. There seem
to be two different approaches, but the subject
 FIR.jpgWiener.jpg 
  179   Thu Jan 27 14:51:41 2011 JanComputingSeismometryapproaching the real world / transfer functionsThe simulation is not a good representation
of a real detector. The first step to make
it a little more realistic is to simulate
 Perf_abs_WA4f2_SW4f1_noTF.jpgPerf_abs_WA4f2_SW4f1_acc.jpgPerf_abs_WA4f2_SW4f1_acex.jpg 
  180   Fri Jan 28 11:22:34 2011 JanComputingSeismometryrealistic noise model -> many problemsSo far, the test mass noise was white noise
such that SNR = NN/noise was about 10. Now
the simulation generates more realistic TM
 NoiseModel_TM.jpgData_WA4f2_SW4f1.jpg 
  181   Fri Jan 28 14:50:27 2011 JanComputingSeismometryColored noise subtraction, a first shotJust briefly, my first subtracition spectra:
 Subtraction_ff.jpg 
  182   Fri Jan 28 15:28:52 2011 JanComputingSeismometryHaha, success!Instead of estimating in the frequency
domain, I now have a filter that is defined
in frequency domain, but transformed
 Subtraction_ff.jpg 
  183   Fri Jan 28 21:09:56 2011 JanSummarySeismometryNN subtraction diagramThis is how Newtonian-noise subtraction
works:
 NN_Filter.jpg 
  185   Thu Mar 10 14:59:54 2011 JanDailyProgressSeismometryThoughts about how to optimize feed-forward for NNIf the plan is to use feed-forward cancellation
instead of noise templates, then the way
to optimize the array design is to understand
 Snap_41.jpg 
  203   Fri May 13 10:52:27 2011 JanMiscSeismometrySTS-2 gutsI was flabbergasted when I saw this. There
are many really good seismometers with very
simple mechanical design and electronics.
 STS-2_dissassembly.pdf 
  291   Wed Aug 10 10:11:14 2011 Daniel, JanDailyProgressSeismometryHealing the GS-13Sometimes people don't know how to handle
seismometers like STS-2 and GS-13. We got
a GS-13 from LLO (broken in several ways).
 RIMG0048.JPGRIMG0049.JPGRIMG0053.JPGRIMG0055.JPG 
  292   Wed Aug 10 10:37:41 2011 Daniel, JanDailyProgressSeismometryProtoypeThe SS-1 Ranger has a new frame now that
allows us to access the parts "during
runtime" and operate it as a prototype.
 RIMG0050.JPGRIMG0132.JPGRIMG0133.JPGRIMG0134.JPG 
  345   Wed Sep 7 18:38:32 2011 Daniel, JanDailyProgressSeismometryGS-13 instrumental noiseWe tried to measure the instrumental noise
of the GS-13, amplified with our low noise
preamp and an SR560 in unity gain mode. Therefore
 Magnet.pngGS13_locked.png 
  738   Tue Oct 15 17:56:39 2013 nicolasLab InfrastructureSi Cantileverbake successful, going to bake moreCryo cantilever dewar.
Here is the pressure trend (30 hours)
after turning off my heat tape.
 afterbake.png 
  740   Tue Oct 15 18:05:32 2013 nicolasLab InfrastructureSi Cantileverprobably a leak in my pump lineThis is the pressure trend when I close
off the valve between the pump line and the
cryostat. I am not totally sure how to interpret
 pumplineleak.pnglineleak.png 
  742   Wed Oct 23 10:02:26 2013 EvanDailyProgressSi CantileverCryo cantilever dewar: heat tape turned offI turned off the heat tape on the cryo
cantilever dewar at GPS time 1066582781.
The pressure was 1.673×10−4
  
  749   Mon Nov 18 19:18:36 2013 nicolasDailyProgressSi CantileverCantilever is back in the dewarI've glued the heater and temperature sensor
to the SS block and wired them to the outside
through the feedthrough.
  
  767   Wed Dec 18 18:04:02 2013 nicolasDailyProgressSi CantileverTemperature sensing and control of silicon cantilever cryostatSo I have an RTD inside the cryostat which
is glued to the steel clamping block. It
has a 100Ohm resistance at 273K and grows
 tempcontrol.png 
  769   Wed Jan 8 13:59:28 2014 nicolasMiscSi CantileverTemperatureThe room temperature in the lab at 1073253434
is 22.8degC.
The raw counts out of the RTD in
  
  770   Wed Jan 15 18:47:57 2014 nicolasDailyProgressSi CantileverFirst temperature cycle resultsI put LN2 in the small dewar until it was
at equilibrium.
This was done without the cold shield
  
  214   Mon May 30 02:09:53 2011 Vladimir DergachevDailyProgressTiltmeterNoise spectrum after cleaningFirst useful spectrum after cleaning. It appears
to be at least as good as before. 

This
plot uses pre-cleaning calibration - it should
 fine_combined_spectrum_zoomed_presentation.png 
  328   Tue Aug 23 22:38:10 2011 Vladimir DergachevNoise HuntingTiltmeter0.1-1 Hz noiseTurns out the noise in 0.1-1 Hz region was
due both to seismic and DAC. After using
a low pass filter on the output I was able
 tilt_combined_spectrum.png 
  330   Wed Aug 24 07:37:33 2011 Vladimir DergachevNoise HuntingTiltmeter0.1-1 Hz noise

    

       
            
  
  659   Mon Jul 1 17:17:35 2013 nicolasLab InfrastructureVacuumSome vacuum pumps that we saw in the Ogin labWe went into the Ogin 
future Crackle Lab and found
a few things that looked like vacuum pumps.
  
  733   Wed Oct 9 18:40:35 2013 nicolasMiscVacuumcantilever dewar leak rate dataTo measure the leak rate, i valved off
the pump and let the pressure rise and wrote
down some numbers:
  
  734   Fri Oct 11 13:31:56 2013 nicolasMiscVacuumcantilever dewar leak rate data

    

       
            
  
  735   Fri Oct 11 13:33:22 2013 nicolasLab InfrastructureVacuumHV feedthrough installed, vacuum bakingI put the new HV feedthrough on the cantilever
dewar. I borrowed the heat tape from the
CTN lab and I am going to bake the chamber
  
  736   Fri Oct 11 16:57:23 2013 nicolasLab InfrastructureVacuumHV feedthrough installed, vacuum baking

    

       
            
  
  737   Mon Oct 14 18:05:35 2013 nicolasLab InfrastructureVacuumbake ended at 1065834142   bakepressure.png 
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