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ID Date Author Type Category Subjectdown Text Attachments
  11   Wed Jun 5 20:39:48 2013 Deep ChatterjeeOpticsGeneralConventional Thermal noise (Sec V) from Liu & Thorne>The linearized PSD plots are created
for the case of thermal noise in finite test
mass (Sec. V) of Liu and Thorne.
 Thorne_thermal_noise.pngPercentage_difference.pngThorne_thermal_noise.pdfPercentage_difference.pdf 
  13   Thu Jun 6 12:40:07 2013 Matt A.OpticsGeneralConventional Thermal noise (Sec V) from Liu & ThorneGood work Deep,
Can you write more on what this is
and why you're doing it? We want our elog
 Thorne_thermal_noise.pngPercentage_difference.png 
  113   Fri Jul 28 15:48:58 2017 MariiaGeneralConfigurationComsol batch for windowsUsing the written path from elog by
ericq: Computer
Scripts/Programs, Comsol can be run from
  
  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 
  14   Thu Jun 6 17:00:11 2013 Deep ChatterjeeOpticsGeneralComparison of ITM and FTM geometries (FIG. 3 Liu & Thorne)In section V of their paper on thermoelastic
and homogenous thermal noise, Liu and Thorne
have corrected the result of power spectral
 C_FTM.pngC_FTM.pdfFig3_Liu&Thorn.bmp 
  6   Tue Jun 4 17:25:11 2013 Emory BrownOpticsGeneralComparison of First Results from COMSOL Model to the Analytic Solution Motivation: Before we can attempt
to modify the mirror designs to reduce the
thermal noise due to Brownian motion in them,
 ComsolComparisonPowerSpectralDensitySurfaceFluctuationsVsFrequency.png 
  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 
  1   Thu Dec 13 18:47:18 2012 ranaGeneralGeneralCOMSOL: who's using up all the licenses? When you want to find out who's
using up all the licenses, you can run lmstat
-a do find out.
  
  2   Tue Feb 5 13:15:13 2013 DmassGeneralGeneralCOMSOL: who's using up all the licenses?

    

       
            
  
  102   Fri Dec 4 18:32:02 2015 ranaGeneralConfigurationCOMSOL: remote server w/ matlabThis summarizes how to get the remote comsol
server to run. COMSOL 5.1.0.234 is now on
tegmeni thanks to Larry.
 BrownianSweep.tgz 
  140   Tue Aug 11 16:35:07 2020 aaronGeneralConfigurationCOMSOL: remote server w/ matlabTo run COMSOL on sandbox1 with no
graphical Interface, here are the
steps that worked for me (Tue Aug 11 16:35:51
  
  139   Tue Aug 11 11:16:29 2020 aaronGeneralConfigurationCOMSOL with Matlab without displayWhen running comsol with matlab interface
on sandbox1, it is usually most convenient
to ssh with screen forwarding (eg '-CY')
  
  76   Mon Sep 16 10:07:32 2013 EvanGeneralConfigurationCOMSOL 4.3 on the OS X command lineIf you're running Matlab scripts that iterate
over simulation parameters (à la Tara),
  
  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 
  12   Wed Jun 5 20:54:59 2013 Deep ChatterjeeGeneralGeneralBessel Function rootsDuring the process of evaluating the PSD
from Sec. V of Liu and Thorn, I chanced to
write a simpler root finding algorithm applying
 Difference_between_algorithms.pngbessel_zeros.m 
  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 
  22   Tue Jun 18 15:26:50 2013 Emory BrownOpticsGeneralAttempting to Implement Liu and Thorne's Boundary ConditionsLiu and Thorne demonstrated in their paper
that the optimal set of boundary conditions
for a problem like the one I am working on
  
  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 
  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 
  106   Tue Jun 28 16:54:23 2016 Nikhil MathurMechanicsAnalysisAnsys 14.5 Indroductory Tutorial: Modal Frequency ConvergenceThis tutorial will go through how to show
frequency convergence for a cylindrical cantilever
using Ansys 14.5 and Mathematica.
 ConvergenceTutorial.pdf.gz 
  18   Tue Jun 11 17:04:33 2013 Deep ChatterjeeGeneralGeneralAnalyzing the file 'thermo_refractive_COMSOL_1D_axisymmetric' by Koji AraiThe file 'thermo_refractive_COMSOL_1D_axisymmetric.m'
found in the SVN repository https://nodus.ligo.caltech.edu:30889/svn/trunk/comsol/thermo-refractive/
  
  5   Mon Jun 3 21:01:46 2013 Emory BrownOpticsGeneralAnalytic Calculation of Thermal Noise due to Brownian Motion using Levin and Thorne's MethodsMotivation:
Reduction of Brownian thermal noise
in future gravitational wave detectors is
 ComparisonPowerSpectralDensitySurfaceFluctuationsVsFrequency.pngDifferencePlot.pngThorneComparisonPowerSpectralDensitySurfaceFluctuationsVsFrequency.nb 
  7   Wed Jun 5 13:31:41 2013 Matt AOpticsGeneralAnalytic Calculation of Thermal Noise due to Brownian Motion using Levin and Thorne's MethodsNice Work Emory,
Can you make a plot with both of
the lines on the same plot, with a legend,
  
  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 
  107   Wed Jun 29 14:14:44 2016 Joy WestlandMechanicsAnalysisANSYS Tutorials with Basic MeshingHere are a series of tutorials for basic
meshing principles from ANSYS Meshing Basics:


ANSYS Meshing Fine Mesh
  
  33   Tue Jun 25 15:18:41 2013 Emory BrownOpticsGeneralA new boundary condition to attempt to avoid the relative residual error I contacted COMSOL support about
our difficulties with the relative residual
error and was told "Typically for solid
  
  36   Wed Jun 26 16:46:32 2013 Emory BrownOpticsGeneralA convergent stationary solution By adding additional constraints
as described in the previous eLog to the
model I was able to get a convergent solution
 ConvergingModelMinimal-6-26-13.mph 
  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 
  105   Tue Jun 28 15:50:45 2016 Joy WestlandMechanicsAnalysisA Simple Model of the Modal Analysis of a Cantilever Circular/Cylinder Cross Section in ANSYS tutorialHere is a tutorial to implement a simple
Modal Analysis of a Cantilever Cylinder

1. Open the ANSYS workbench
 Simple_Cantilever_200_mm_Long_Geometry.PNGSimple_Cantilever_200_mm_Long.PNGComparison_between_ANSYS_and_Calculations_Fused_Silica_200_mm_L.PNG 
  118   Mon Dec 4 16:27:13 2017 aaronMechanicsPonderSqueeze Meshing Surface Layers

Defining
New Selections

I don't know
why I wasn't seeing this problem with
  
ELOG V3.1.3-