40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  COMSOL elog, Page 2 of 3  Not logged in ELOG logo
ID Date Author Type Categorydown Subject Text Attachments
  39   Thu Jun 27 17:12:33 2013 Arnaldo RodriguezOpticsGeneralDefocusing in P-Controlled Manual Simulation To test the effectiveness of the
PID loop, I've only given a nonzero value
to the K_p constant and varied it over a
 Defocus_(P_Active).png 
  40   Fri Jun 28 11:54:10 2013 Emory BrownOpticsGeneralMaintaining a constant volume while modifying the radii of the test mass faces When changing the dimensions of the
mirror, we want to keep a constant volume.
 To do so, we must modify the height of the
  
  41   Fri Jun 28 14:03:07 2013 Deep ChatterjeeGeneralGeneralApproach for TE noise for beam in cavityIn this post I mention of the approach
that would be taken to solve for the TE noise
spectrum for a beam inside the substrate
 LL_derivations.pdf 
  42   Mon Jul 1 13:01:58 2013 Arnaldo RodriguezOpticsGeneralBrief Parameter Study on P-active Control Loop The following is a plot of the defocus
as a function of time with only the proportional
gain being nonzero. Only three cases were
 K_p.png 
  43   Mon Jul 1 17:31:40 2013 Arnaldo RodriguezOpticsGeneralParameter Study on Sampling Time for P-active Loop The following is a plot of the defocus
as a function of time for a fixed proportionality
gain of 150, and different listed sampling
 Deltat.png 
  44   Tue Jul 2 13:32:30 2013 Emory BrownOpticsGeneralUsing Matlab to run our COMSOL simulations We want to be able to test a number
of values for the ratio of the radii of the frustum
which will be much easier once we can get
 model_7_1_13.mlooper.m 
  45   Wed Jul 3 00:04:46 2013 KojiOpticsGeneralUsing Matlab to run our COMSOL simulationsPlease use zipped files instead of uploading
extremely long text files on the elog. 
Or use wiki or svn instead of elog
  
  46   Thu Jul 4 15:23:47 2013 Deep ChatterjeeOpticsGeneralAttempt to compute TE noise following Liu and ThorneLiu and Thorne, in their paper have analytically
solved for the TE noise spectra considering
the test mass to be a half infinite space.
 Liu&Thorne_type.bmpsomething_like_TE_1.bmpsomething_like_TE_1_10times.bmpsomething_like_TE_1_1000times.bmp2D_almost_infinte_TE.mph 
  47   Fri Jul 5 14:06:24 2013 Deep ChatterjeeOpticsGeneralAttempt to compute TE noise following Liu and Thorne


   
        
            
 comparison.bmpL&T_COMSOL_difference.bmp 
  48   Mon Jul 8 15:47:23 2013 Emory BrownOpticsGeneralMeshing error when varying geometry I attempted to run the Matlab code
built last week, but received an error that
the mesh failed to generate on the inner
  
  49   Mon Jul 8 18:39:31 2013 Matt A.OpticsGeneralMeshing error when varying geometry

    

       
            
  
  50   Mon Jul 8 19:04:35 2013 Matt A.OpticsGeneralMeshing error when varying geometry

    

       
            
 SimpleCylinder.mph 
  51   Tue Jul 9 14:45:04 2013 Emory BrownOpticsGeneralMeshing error when varying geometryI tried removing the constraints and applied
force and was able to get close to the same
frequencies for the butterfly modes as the
 Eigenfrequency.png 
  52   Wed Jul 10 14:15:20 2013 Emory BrownOpticsGeneralComparison of Umax and the frequency of the lowest eigenmode against ratioR I was able to run the looper program
designed last week over the interval ratioR=[0.5,
0.9] with a step size of 0.01 and obtained
 UmaxValuesVsRatioR.pngFrequencyLowestEigenmodes.pngdata.tar.gz 
  53   Wed Jul 10 17:52:18 2013 KojiGeneralGeneralHow to force time steps for a time dependent simulationA common trap in COMSOL:
When you run a time series simulation,
COMSOL tries to be "clever" by
  
  54   Thu Jul 11 19:16:12 2013 Deep ChatterjeeGeneralGeneralTE noise problem - Matlab scriptThe present aim is the calculation of the
TE noise like Liu and Thorne. Although, the
results of Liu and Thorne are for the case
 TE_model.malmost_infinite_2D_axisym_TE_4.m 
  55   Fri Jul 12 00:09:17 2013 Emory BrownOpticsGeneralAnalysis of substrate Brownian noise in a silicon test mass with changing ratioR value I performed the same analysis we
previously did on a test mass made of silicon
(using the built-in silicon within COMSOL)
 SiliconEigenfrequencyPlot.pngUmaxPlotSilicon.pngSilicon.tar.gz 
  56   Fri Jul 12 00:31:11 2013 Emory BrownOpticsGeneralReversed face mirror design We had noticed that when we ran an
eigenfrequency analysis, there was often
a node (see attached screenshot) on the face
 node.png 
  57   Fri Jul 12 19:43:32 2013 Deep ChatterjeeGeneralGeneralTE noise problem - Matlab script

    

       
            
 codes_TE_calc.zip 
  58   Sun Jul 14 15:13:46 2013 Deep ChatterjeeGeneralGeneralTE noise problem - Matlab script

    

       
            
 codes_TE_calc_(2).zip 
  59   Mon Jul 15 13:14:30 2013 Emory BrownOpticsGeneralUmax curves for varying height test masses I ran sweeps over the ratioR range
from 0.5 to 0.9 for test masses with modified
height, and thus mass, which were otherwise
 MassComparison.png 
  60   Mon Jul 15 16:05:29 2013 Deep ChatterjeeGeneralGeneralTE noise problem - Matlab script

    

       
            
 codes_TE_calc.zipJul_15.bmp 
  61   Tue Jul 23 18:26:04 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noiseIn this post I report of the results of
TE noise simulated by COMSOL for the TE noise
of Infinite test masses.
 Jul_23.bmpTE_calc_Jul23.zipJul_23.eps 
  67   Tue Jul 23 20:53:37 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noise

    

       
            
 Jul_23_bettermesh2.eps 
  66   Tue Jul 23 20:53:37 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noise

    

       
            
 Jul_23_bettermesh2.eps 
  65   Tue Jul 23 20:53:37 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noise

    

       
            
 Jul_23_bettermesh2.eps 
  64   Tue Jul 23 20:53:37 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noise

    

       
            
 Jul_23_bettermesh2.eps 
  63   Tue Jul 23 20:53:37 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noise

    

       
            
 Jul_23_bettermesh2.eps 
  62   Tue Jul 23 20:53:37 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noise

    

       
            
 Jul_23_bettermesh2.eps 
  68   Tue Jul 23 20:53:45 2013 Deep ChatterjeeOpticsGeneralComparison between Liu and Thorne Results and COMSOL results for TE noise

    

       
            
 Jul_23_bettermesh2.eps 
  69   Wed Jul 24 21:08:24 2013 Deep ChatterjeeOpticsGeneralTR results for different dimensionsIn this post I simulate the procedure of
calculating the TR noise for finite cavities
as proposed by Heinert and check for a
 Jul24.pdfJul24_acalc.pdf 
  70   Thu Jul 25 11:36:17 2013 ranaOpticsGeneralTR results for different dimensions 
 PDF
  
  71   Thu Jul 25 13:21:46 2013 Deep ChatterjeeOpticsGeneralTR results for different dimensions

    

       
            
 Jul_25.pdf 
  72   Thu Jul 25 15:54:58 2013 Deep ChatterjeeOpticsGeneralTR results for different dimensions

    

       
            
 Jul_25_1.pdfJul_25_2.pdfrelative_plot.pdf 
  73   Mon Jul 29 22:42:57 2013 Deep ChatterjeeOpticsGeneralAvoiding transient solutions in the Computation of TE/TR noiseAn error was being encountered in the computation
of the TR noise lately. It was observed that
while running the simulations in the case
 Jul29_2.pdf 
  74   Wed Jul 31 15:39:11 2013 Deep ChatterjeeOpticsGeneralFirst try with paramter optimization for TE and TR noise profilesAfter the simulations have been found to
match to a fair extent with the analytic
results by Heinert and Liu and Thorne, the
 Jul31_param_opt.pdf 
  75   Thu Aug 8 17:17:19 2013 Deep ChatterjeeOpticsGeneralSomething like cancellationFor the material parameters of Sapphire
at 300K, the TE and TR Noise profiles, though
not very close, lie close to within an order
 suspected_cance_AUg8l.pdf 
  86   Tue Jun 24 14:35:42 2014 Sam MooreOpticsGeneralTrying to Verify the Heinert Model   06_23_14.pdf 
  87   Tue Jun 24 17:05:24 2014 Sam MooreOpticsGeneralTrying to Verify the Heinert Model It does appear that the simplified
model is only relevant for the simulations.
 To quote Heinert: "An efficient
 temperature.pngnoiseAmplitude_agreement.png 
  88   Sat Jun 28 21:59:11 2014 Sam MooreOpticsGeneralDifficulty with the COMSOL stationary module; Test Cases Here, I describe some test cases
to see if COMSOL's solutions are agreeing
with some simple analytical solutions.  Right
 6_27_14.pdf 
  89   Sun Jun 29 15:37:18 2014 Sam MooreOpticsGeneralDifficulty with the COMSOL stationary module; Test Cases

    

       
            
 6_29_14.pdf 
  90   Sun Jun 29 20:25:44 2014 KojiOpticsGeneralDifficulty with the COMSOL stationary module; Test CasesWhat about this example? The result is
easier to understand intuitively.
Consider a bar with the length of
  
  93   Thu Jul 10 16:51:14 2014 Sam MooreOpticsGeneralDuan and Heinert Comparison(See Plots in attached document)
 
My plan has been to replicate Duan's
 7_10_14.pdf 
  95   Mon Jul 14 19:09:14 2014 Sam MooreOpticsGeneralUsing Heinert's Solution for Duan's Parameters I have plotted Heinert's analytical
solution for TR noise using Duan's parameters.
 Since TO and TE noise can be found
 oneD_duanParams_residual-eps-converted-to.pdfthreeD_duanParams_residual-eps-converted-to.pdf 
  96   Mon Jul 14 19:14:31 2014 Sam MooreOpticsGeneralDuan and Heinert Comparison

    

       
            
 duan_heinert_comparisonInfinite-eps-converted-to.pdf 
  97   Thu Jul 31 20:55:38 2014 Sam MooreOpticsGeneralFinding the Right Meshing for the TIR cavity In this document, I try to identify
I good mesh by comparing the numerical solution
from that mesh with my analytical model.
 7_30_14.pdf 
  98   Sat Aug 2 00:22:34 2014 Sam MooreOpticsGeneralFinding the Right Meshing for the TIR cavity

    

       
            
 8_1_14.pdf 
  108   Fri Jul 29 14:33:41 2016 Joy WestlandMechanicsGeneralA Tutorial in Importing SolidWorks Files and Applying a Gaussian Force in ANSYS for a LIGO Test MassHere is a tutorial in importing SolidWorks
into ANSYS and the steps needed to apply
a Gaussian Force to the LIGO test mass that’s
 Bottom_Test_Mass_With_Ears.PNGApplying_Parameters.PNGApplying_Gaussian_Force.PNG 
  114   Mon Jul 31 22:18:57 2017 ranaGeneralGeneralusing more than 12 cores in matlabSince
2014, the limit of 12 workers using the matlab
parallel computing toolbox has been lifted.
 Screen_Shot_2017-07-31_at_10.11.35_PM.png 
  127   Sat Mar 17 15:27:48 2018 ranaGeneralGeneralfile size >> smallWhen saving your COMSOL files do these
two things to make the files much smaller
(good for saving in version control and sharing):
  
ELOG V3.1.3-