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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Categoryup Subject Text Attachments
  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):
  
  128   Mon Aug 20 15:44:56 2018 ranaGeneralGeneralfile size >> smallAlso,


click 'Clear Mesh'
under the mesh menu
'Clear
  
  138   Tue May 12 14:16:28 2020 KojiGeneralGeneralFEA tutorial resourcescf. Forwarded email from Stephen

1) Tuesday Demo - Basics of FEA
Meshing G2000696
  
  115   Thu Nov 2 17:23:56 2017 AaronMechanicsPonderSqueezeModelling suspension noiseaLIGO Suspensions Toy Model

On
Wednesday I started making my own model
of the aLIGO suspensions, with the top of
  
  116   Fri Nov 3 15:03:10 2017 AaronMechanicsPonderSqueezeModelling suspension noiseModel Geometry

Test
Mass

I found the dimension
of the test mass flat in the drawings of
  
  117   Wed Nov 15 14:05:12 2017 AaronMechanicsPonderSqueezeModelling suspension noiseModel Geometry

I
pared down the number of parameters in the
model to only the necessary ones. These are
  
  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
  
  119   Mon Dec 4 17:42:53 2017 gautamMechanicsPonderSqueezeFEA on optimusWe could run the simulations on the 32
core machine in the 40m lab (optimus)? I
think Mariia was running some of her studies
  
  120   Mon Dec 4 19:49:32 2017 gautamMechanicsPonderSqueezeFEA on optimusIt's a good idea, I'll check out
her elogs and get it started tonight.

I found that I had the relative
  
  121   Tue Dec 5 10:50:54 2017 aaronMechanicsPonderSqueezeFEA on optimusI had some trouble running this on optimus.

Optimus has COMSOL 5.1 installed,
but I made these files in 5.3. I downloaded
  
  122   Tue Dec 5 19:50:47 2017 aaronMechanicsPonderSqueezeFEA on optimusGautam advised me against trying to install
version 5.3, lest it break version 5.1--I
had already gone through the install, but
  
  123   Tue Dec 12 11:50:12 2017 aaronMechanicsPonderSqueezeFEA on optimusSimulation results

First
run

Gautam ran the
COMSOL model on sandbox1 since we were trying
 SERaLIGO.jpg 
  124   Thu Jan 18 21:13:59 2018 aaronOpticsPonderSqueezemodifications to Gautam's 40m finesse modelI made a copy of Gautam's 40m model
to add the unstable filter cavity for
the ponderomotive squeezing project. I wanted
  
  125   Mon Jan 22 21:13:25 2018 aaronMechanicsPonderSqueezetips from ShoaibI talked with Shoaib about some changes
I could make to the FEA model to improve
convergence and reduce memory usage. Summary:
  
  126   Mon Jan 29 23:02:13 2018 aaronMechanicsPonderSqueezetips from ShoaibI started implemented some of these changes:


Started the mesh with a
boundary free quad mesh on the interface
  
  109   Sun May 7 18:22:35 2017 ranaGeneralVoyagerVoyager ITM: Radiative cooling with cold shield and cold CPI took
Aidan's COMSOL model for the ITM from
 ITM-ColdShield-CP.png 
  130   Sun Aug 26 19:21:27 2018 ranaGeneralVoyagerVoyager ITM: Radiative cooling with cold shield and cold CPthis is a time dependent model of the previous
steady-state one


Cold Shield and CP held
 ITM-Cooldown.pdfCoolDown.webm 
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