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Dedicated script for investigating the use of sidebands to enhance the 2D-MOT loading rate.

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Karthik 2021-08-19 12:39:10 +02:00
parent cedbb008af
commit b520586f41
1 changed files with 84 additions and 8 deletions
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92
+Scripts/optimizingForSidebandEnhancement.m
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@ -2,12 +2,12 @@ OptionsStruct = struct;
OptionsStruct.ErrorEstimationMethod = 'bootstrap'; % 'jackknife' | 'bootstrap' OptionsStruct.ErrorEstimationMethod = 'bootstrap'; % 'jackknife' | 'bootstrap'
OptionsStruct.NumberOfAtoms = 5000; OptionsStruct.NumberOfAtoms = 5000;
OptionsStruct.TimeStep = 50e-06; % in s OptionsStruct.TimeStep = 50e-06; % in s
OptionsStruct.SimulationTime = 4e-03; % in s OptionsStruct.SimulationTime = 5e-03; % in s
OptionsStruct.SpontaneousEmission = true; OptionsStruct.SpontaneousEmission = true;
OptionsStruct.SidebandBeam = true; OptionsStruct.SidebandBeam = false;
OptionsStruct.PushBeam = true; OptionsStruct.PushBeam = true;
OptionsStruct.Gravity = true; OptionsStruct.Gravity = true;
OptionsStruct.BackgroundCollision = true; OptionsStruct.BackgroundCollision = false;
OptionsStruct.SaveData = true; OptionsStruct.SaveData = true;
% OptionsStruct.SaveDirectory = ''; % OptionsStruct.SaveDirectory = '';
options = Helper.convertstruct2cell(OptionsStruct); options = Helper.convertstruct2cell(OptionsStruct);
@ -15,18 +15,92 @@ clear OptionsStruct
Oven = Simulator.Oven(options{:}); Oven = Simulator.Oven(options{:});
MOT2D = Simulator.TwoDimensionalMOT(options{:}); MOT2D = Simulator.TwoDimensionalMOT(options{:});
Beams = MOT2D.Beams;
%% %%
MOT2D.NumberOfAtoms = 5000; MOT2D.NumberOfAtoms = 10000;
MOT2D.TotalPower = 0.8;
MOT2D.MagneticGradient = 0.4; 0;
CoolingBeam = Beams{cellfun(@(x) strcmpi(x.Alias, 'Blue'), Beams)};
CoolingBeam.Waist = 15e-03;
CoolingBeam.Detuning = -1.67*Helper.PhysicsConstants.BlueLinewidth;
SidebandBeam = Beams{cellfun(@(x) strcmpi(x.Alias, 'BlueSideband'), Beams)};
SidebandBeam.Waist = 15e-03;
NumberOfPointsForFirstParam = 20; %iterations of the simulation
NumberOfPointsForSecondParam = 20;
DetuningArray = linspace(-1.0, -6.0, NumberOfPointsForFirstParam) * Helper.PhysicsConstants.BlueLinewidth;
PowerArray = linspace(0, 0.8, NumberOfPointsForSecondParam) * MOT2D.TotalPower;
tStart = tic;
[LoadingRateArray, ~, ~] = Scripts.scanForSidebandEnhancement(Oven, MOT2D, 'Blue', 'BlueSideband', DetuningArray, PowerArray);
tEnd = toc(tStart);
fprintf('Total Computational Time: %0.1f seconds. \n', tEnd);
if MOT2D.DoSave
LoadingRate = struct;
LoadingRate.Values = LoadingRateArray;
MOT2D.Results = LoadingRate;
SaveFolder = [MOT2D.SaveDirectory filesep 'Results'];
Filename = ['TwoParameterScan_' datestr(now,'yyyymmdd_HHMM')];
eval([sprintf('%s_Object', Filename) ' = MOT2D;']);
mkdir(SaveFolder);
save([SaveFolder filesep Filename], sprintf('%s_Object', Filename));
end
MOT2D.SidebandBeam = false;
MOT2D.PushBeam = false;
CoolingBeam.Power = MOT2D.TotalPower;
[LoadingRate, ~] = MOT2D.runSimulation(Oven);
EnhancementFactorArray = LoadingRateArray ./ LoadingRate;
% - Plot results
OptionsStruct = struct;
OptionsStruct.RescalingFactorForFirstParameter = (Helper.PhysicsConstants.BlueLinewidth)^-1;
OptionsStruct.XLabelString = 'Sideband Beam Detuning (\Delta/\Gamma)';
OptionsStruct.RescalingFactorForSecondParameter = 1000;
OptionsStruct.YLabelString = 'Sideband Beam Power (mW)';
OptionsStruct.RescalingFactorForQuantityOfInterest = 1;
OptionsStruct.ZLabelString = 'Enhancement Factor (\eta)';
% OptionsStruct.ZLabelString = 'Loading rate (x 10^{9} atoms/s)';
OptionsStruct.TitleString = sprintf('Magnetic Gradient = %.0f (G/cm)', MOT2D.MagneticGradient * 100);
options = Helper.convertstruct2cell(OptionsStruct);
Plotter.plotResultForTwoParameterScan(DetuningArray, PowerArray, EnhancementFactorArray, options{:})
%% Magnetic gradient scan
MOT2D.NumberOfAtoms = 10000;
MOT2D.TotalPower = 0.4; MOT2D.TotalPower = 0.4;
MOT2D.SidebandBeam = true; MOT2D.SidebandBeam = true;
NumberOfPointsForFirstParam = 10; %iterations of the simulation NumberOfPointsForFirstParam = 10; %iterations of the simulation
NumberOfPointsForSecondParam = 10; NumberOfPointsForSecondParam = 10;
NumberOfPointsForThirdParam = 6;
DetuningArray = linspace(-0.5, -5.0, NumberOfPointsForFirstParam) * Helper.PhysicsConstants.BlueLinewidth; DetuningArray = linspace(-0.5, -5.0, NumberOfPointsForFirstParam) * Helper.PhysicsConstants.BlueLinewidth;
PowerArray = linspace(0.1, 1.0, NumberOfPointsForSecondParam) * MOT2D.TotalPower; PowerArray = linspace(0.1, 1.0, NumberOfPointsForSecondParam) * MOT2D.TotalPower;
MagneticGradientArray = linspace(30, 50, NumberOfPointsForThirdParam) * 1e-02;
Beams = MOT2D.Beams;
CoolingBeam = Beams{cellfun(@(x) strcmpi(x.Alias, 'Blue'), Beams)};
SidebandBeam = Beams{cellfun(@(x) strcmpi(x.Alias, 'BlueSideband'), Beams)};
LoadingRateArray = {};
tStart = tic; tStart = tic;
[LoadingRateArray, ~, ~] = Scripts.scanForSidebandEnhancement(Oven, MOT2D, 'Blue', 'BlueSideband', DetuningArray, PowerArray); for k=1:NumberOfPointsForThirdParam
eval(sprintf('MOT2D.%s = %d;', 'MagneticGradient', MagneticGradientArray(k)));
lrmatrix = zeros(NumberOfPointsForFirstParam, NumberOfPointsForSecondParam);
for i=1:NumberOfPointsForFirstParam
eval(sprintf('SidebandBeam.%s = %d;', 'Detuning', DetuningArray(i)));
for j=1:NumberOfPointsForSecondParam
eval(sprintf('SidebandBeam.%s = %d;', 'Power', PowerArray(j)));
eval(sprintf('CoolingBeam.%s = %d;', 'Power', MOT2D.TotalPower - PowerArray(j)));
[lrmatrix(i,j), ~, ~] = MOT2D.runSimulation(Oven);
end
end
LoadingRateArray{end+1} = lrmatrix;
end
tEnd = toc(tStart); tEnd = toc(tStart);
fprintf('Total Computational Time: %0.1f seconds. \n', tEnd); fprintf('Total Computational Time: %0.1f seconds. \n', tEnd);
@ -36,13 +110,15 @@ OptionsStruct = struct;
OptionsStruct.RescalingFactorForFirstParameter = (Helper.PhysicsConstants.BlueLinewidth)^-1; OptionsStruct.RescalingFactorForFirstParameter = (Helper.PhysicsConstants.BlueLinewidth)^-1;
OptionsStruct.XLabelString = 'Sideband Beam Detuning (\Delta/\Gamma)'; OptionsStruct.XLabelString = 'Sideband Beam Detuning (\Delta/\Gamma)';
OptionsStruct.RescalingFactorForSecondParameter = 1000; OptionsStruct.RescalingFactorForSecondParameter = 1000;
OptionsStruct.YLabelString = 'Sideband Beam Power (mW)'; OptionsStruct.YLabelString = 'Sideband Beam Waist (mm)';
OptionsStruct.RescalingFactorForThirdParameter = 100;
OptionsStruct.RescalingFactorForQuantityOfInterest = 1e-9; OptionsStruct.RescalingFactorForQuantityOfInterest = 1e-9;
OptionsStruct.ZLabelString = 'Loading rate (x 10^{9} atoms/s)'; OptionsStruct.ZLabelString = 'Loading rate (x 10^{9} atoms/s)';
OptionsStruct.TitleString = sprintf('Magnetic Gradient = %.0f (G/cm)', MOT2D.MagneticGradient * 100); OptionsStruct.PlotTitleString = 'Magnetic Gradient = %.0f (G/cm)';
OptionsStruct.FigureTitleString = sprintf('Oven-2DMOT Distance = %.1f (mm); Total Beam Power = %d (mW)', Oven.OvenDistance * 1000, MOT2D.TotalPower*1000);
options = Helper.convertstruct2cell(OptionsStruct); options = Helper.convertstruct2cell(OptionsStruct);
Plotter.plotResultForTwoParameterScan(DetuningArray, PowerArray, LoadingRateArray, options{:}) Plotter.plotResultForThreeParameterScan(DetuningArray, PowerArray, MagneticGradientArray, LoadingRateArray, options{:})
clear OptionsStruct clear OptionsStruct