ID 
Date 
Author 
Type 
Category 
Subject 
166

Wed Jun 13 16:36:14 2012 
Alex Mauney  Misc  aLIGO Modeling  6/12 and 6/13 Daily Summary 
 Realized that the strange deformations that we were seeing only occur on the face nearest the ring heater, and not on the face we are worried about (the HR face)
 Read papers by Morrison et al. and Kogelnik to get a better understanding of the mathematics and operations of the optical cavity modeled in SIS
 Read some of the SIS manual to better understand the program and the physics that it was using (COMSOL licenses were full) 
168

Thu Jun 14 16:51:03 2012 
Alex Mauney  Misc  aLIGO Modeling  6/14/12 Daily Summary 
 Plugged the output of the model with uniform heating into SIS using both modification of the radius of curvature, and direct importation of deflection data
 Generated a graph for asymmetric heating and did the same
 Aligned axes in model to better match with the axes in MATLAB and SIS so that the extrema in deflections lie along x and y (not yet implemented in the data below) 
Attachment 1: SIS_Outputs.txt

Unchanged field:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
FP cavity modal analysis using cold optics parameters
ROC(ITM) = 1934, ROC(ETM) = 2245, Cavity lenggth = 3994.499999672, total Gouy = 2.7169491305278
Fval(ITM) = 4297.7777755379, OPL(ITM) = 0.13793083662307, Fval(ETM) = 4988.8888885557
waist size = 0.01203704073212, waist position from ITM = 1834.2198819617, Rayleigh range = 427.80682127602
Mode parameters of cavity fields
ETM AR (out base) : w = 0.0619634 R = 1548.276 z = 1519.925 z0 = 207.583 w0 = 0.008384783
... 138 more lines ...

Attachment 2: Assymetric_Heating_Line_Graph.png


169

Mon Jun 18 16:30:36 2012 
Alex Mauney  Misc  aLIGO Modeling  6/18/12 Daily Summary 
 Verified that the SIS output does match satisfy the equations for Gaussian beam propagation
 Investigated how changing the amount of data points going into SIS changed the output, as well as how changes in the astigmatic heating effect the output
+ The results are very dependent on number of data points (similar order changes to changing the heating)
+ Holding the number of data points the same, more assymetric heating tends to lead to more power in the H(2,0) mode, and less in the H(0,2)

171

Tue Jun 19 16:24:52 2012 
Alex Mauney  Misc  aLIGO Modeling  6/19/12 Daily Summary 
 Did more modeling for different levels of heating and different mesh densities for the SIS input.
 Lots of orientation stuff
 Started on progress report. 
172

Wed Jun 20 16:44:58 2012 
Alex Mauney  Misc  aLIGO Modeling  6/20/12 Daily Summary 
 Attended a lot of meetings (Safety, LIGO Orientation)
 Finished draft of week 3 report (images attached)

Attachment 1: TS_model_deformation_line_graph_2W_10%.png


Attachment 2: TS_model_deformation_line_graph_2W_10%_sym.png


Attachment 3: TS_model_deformation_line_graph_2W_10%_antisym.png


Attachment 4: TS_model_deformation_contour_graph_2W_10%.png


Attachment 5: HTSM_model_deformation_contour_graph_2W_10%.png


174

Thu Jun 21 16:54:45 2012 
Alex Mauney  Misc  aLIGO Modeling  6/21/12 Daily Summary 
 Paper edits and more data generation for the paper (lower resolution grid data)
 Attended a talk on LIGO

177

Wed Jun 27 16:43:56 2012 
Alex Mauney  Misc  aLIGO Modeling  6/27/12 Daily Summary 
Plan for building the model
 Find the fields that would be incident on the beam splitter from each arm (This is done already)
 Propagate these through until they get to the OMC using the TELESCOPE function in SIS
 Combine the fields incident on the OMC in MATLAB and minimize the power to get the input field for the OMC (Most of this is done, just waiting to figure out what kind of format we need to use it as an SIS input)
 Model the OMC as an FP cavity in SIS
+ Need to think about how to align the cavity in a sensible way in SIS (need to find out more about how they actually do it)
 Pick off the fields from both ends of the OMCFP cavity for analysis
 Add thermal effects to one of the arms and see how that changes the fields, specifically how the signal to noise ratio changes 
178

Thu Jun 28 16:27:37 2012 
Alex Mauney  Misc  aLIGO Modeling  6/28/12 Daily Summary 
 Finished the MatLab code that both combines two fields and simulates the adjustment of the beamsplitter to minimize the power out (with a small offset).
 Added the signal recycling telescope to the SIS code that generates the fields
To Do: Make the OMC cavity in SIS

180

Mon Jul 9 16:54:17 2012 
Alex Mauney  Misc  aLIGO Modeling  7/9/12 Summary 
Made a COMSOL model that can include CO2 laser heating, self heating, and ring heating
Figured out how to run SIS out of a script and set up commands to run the two SIS stages of the model 