[968] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // $Id: G4LivermorePolarizedComptonModel.cc,v 1.2 2009/01/21 10:58:13 sincerti Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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| 28 | // |
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| 29 | |
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| 30 | #include "G4LivermorePolarizedComptonModel.hh" |
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| 31 | |
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| 32 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 33 | |
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| 34 | using namespace std; |
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| 35 | |
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| 36 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 37 | |
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| 38 | G4LivermorePolarizedComptonModel::G4LivermorePolarizedComptonModel(const G4ParticleDefinition*, |
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| 39 | const G4String& nam) |
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| 40 | :G4VEmModel(nam),isInitialised(false),meanFreePathTable(0),scatterFunctionData(0),crossSectionHandler(0) |
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| 41 | { |
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| 42 | lowEnergyLimit = 250 * eV; // SI - Could be 10 eV ? |
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| 43 | highEnergyLimit = 100 * GeV; |
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| 44 | SetLowEnergyLimit(lowEnergyLimit); |
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| 45 | SetHighEnergyLimit(highEnergyLimit); |
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| 46 | |
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| 47 | verboseLevel= 0; |
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| 48 | // Verbosity scale: |
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| 49 | // 0 = nothing |
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| 50 | // 1 = warning for energy non-conservation |
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| 51 | // 2 = details of energy budget |
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| 52 | // 3 = calculation of cross sections, file openings, sampling of atoms |
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| 53 | // 4 = entering in methods |
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| 54 | |
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| 55 | G4cout << "Livermore Polarized Compton is constructed " << G4endl |
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| 56 | << "Energy range: " |
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| 57 | << lowEnergyLimit / keV << " keV - " |
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| 58 | << highEnergyLimit / GeV << " GeV" |
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| 59 | << G4endl; |
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| 60 | |
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| 61 | } |
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| 62 | |
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| 63 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 64 | |
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| 65 | G4LivermorePolarizedComptonModel::~G4LivermorePolarizedComptonModel() |
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| 66 | { |
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| 67 | if (meanFreePathTable) delete meanFreePathTable; |
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| 68 | if (crossSectionHandler) delete crossSectionHandler; |
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| 69 | if (scatterFunctionData) delete scatterFunctionData; |
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| 70 | } |
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| 71 | |
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| 72 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 73 | |
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| 74 | void G4LivermorePolarizedComptonModel::Initialise(const G4ParticleDefinition* particle, |
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| 75 | const G4DataVector& cuts) |
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| 76 | { |
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| 77 | if (verboseLevel > 3) |
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| 78 | G4cout << "Calling G4LivermorePolarizedComptonModel::Initialise()" << G4endl; |
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| 79 | |
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| 80 | if (crossSectionHandler) |
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| 81 | { |
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| 82 | crossSectionHandler->Clear(); |
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| 83 | delete crossSectionHandler; |
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| 84 | } |
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| 85 | |
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| 86 | // Energy limits |
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| 87 | |
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| 88 | if (LowEnergyLimit() < lowEnergyLimit) |
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| 89 | { |
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| 90 | G4cout << "G4LivermorePolarizedComptonModel: low energy limit increased from " << |
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| 91 | LowEnergyLimit()/eV << " eV to " << lowEnergyLimit << " eV" << G4endl; |
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| 92 | SetLowEnergyLimit(lowEnergyLimit); |
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| 93 | } |
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| 94 | |
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| 95 | if (HighEnergyLimit() > highEnergyLimit) |
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| 96 | { |
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| 97 | G4cout << "G4LivermorePolarizedComptonModel: high energy limit decreased from " << |
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| 98 | HighEnergyLimit()/GeV << " GeV to " << highEnergyLimit << " GeV" << G4endl; |
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| 99 | SetHighEnergyLimit(highEnergyLimit); |
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| 100 | } |
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| 101 | |
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| 102 | // Reading of data files - all materials are read |
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| 103 | |
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| 104 | crossSectionHandler = new G4CrossSectionHandler; |
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| 105 | crossSectionHandler->Clear(); |
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| 106 | G4String crossSectionFile = "comp/ce-cs-"; |
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| 107 | crossSectionHandler->LoadData(crossSectionFile); |
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| 108 | |
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| 109 | meanFreePathTable = 0; |
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| 110 | meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials(); |
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| 111 | |
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| 112 | G4VDataSetAlgorithm* scatterInterpolation = new G4LogLogInterpolation; |
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| 113 | G4String scatterFile = "comp/ce-sf-"; |
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| 114 | scatterFunctionData = new G4CompositeEMDataSet(scatterInterpolation, 1., 1.); |
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| 115 | scatterFunctionData->LoadData(scatterFile); |
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| 116 | |
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| 117 | // For Doppler broadening |
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| 118 | shellData.SetOccupancyData(); |
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| 119 | G4String file = "/doppler/shell-doppler"; |
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| 120 | shellData.LoadData(file); |
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| 121 | |
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| 122 | // |
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| 123 | if (verboseLevel > 2) |
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| 124 | G4cout << "Loaded cross section files for Livermore Polarized Compton model" << G4endl; |
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| 125 | |
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| 126 | InitialiseElementSelectors(particle,cuts); |
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| 127 | |
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| 128 | G4cout << "Livermore Polarized Compton model is initialized " << G4endl |
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| 129 | << "Energy range: " |
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| 130 | << LowEnergyLimit() / keV << " keV - " |
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| 131 | << HighEnergyLimit() / GeV << " GeV" |
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| 132 | << G4endl; |
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| 133 | |
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| 134 | // |
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| 135 | |
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| 136 | if(isInitialised) return; |
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| 137 | |
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| 138 | if(pParticleChange) |
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| 139 | fParticleChange = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange); |
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| 140 | else |
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| 141 | fParticleChange = new G4ParticleChangeForGamma(); |
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| 142 | |
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| 143 | isInitialised = true; |
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| 144 | } |
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| 145 | |
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| 146 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 147 | |
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| 148 | G4double G4LivermorePolarizedComptonModel::ComputeCrossSectionPerAtom( |
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| 149 | const G4ParticleDefinition*, |
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| 150 | G4double GammaEnergy, |
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| 151 | G4double Z, G4double, |
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| 152 | G4double, G4double) |
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| 153 | { |
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| 154 | if (verboseLevel > 3) |
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| 155 | G4cout << "Calling ComputeCrossSectionPerAtom() of G4LivermorePolarizedComptonModel" << G4endl; |
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| 156 | |
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| 157 | G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy); |
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| 158 | return cs; |
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| 159 | } |
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| 160 | |
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| 161 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 162 | |
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| 163 | void G4LivermorePolarizedComptonModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
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| 164 | const G4MaterialCutsCouple* couple, |
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| 165 | const G4DynamicParticle* aDynamicGamma, |
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| 166 | G4double, |
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| 167 | G4double) |
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| 168 | { |
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| 169 | // The scattered gamma energy is sampled according to Klein - Nishina formula. |
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| 170 | // The random number techniques of Butcher & Messel are used (Nuc Phys 20(1960),15). |
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| 171 | // GEANT4 internal units |
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| 172 | // |
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| 173 | // Note : Effects due to binding of atomic electrons are negliged. |
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| 174 | |
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| 175 | if (verboseLevel > 3) |
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| 176 | G4cout << "Calling SampleSecondaries() of G4LivermorePolarizedComptonModel" << G4endl; |
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| 177 | |
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| 178 | G4double gammaEnergy0 = aDynamicGamma->GetKineticEnergy(); |
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| 179 | G4ThreeVector gammaPolarization0 = aDynamicGamma->GetPolarization(); |
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| 180 | |
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| 181 | // Protection: a polarisation parallel to the |
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| 182 | // direction causes problems; |
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| 183 | // in that case find a random polarization |
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| 184 | |
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| 185 | G4ThreeVector gammaDirection0 = aDynamicGamma->GetMomentumDirection(); |
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| 186 | |
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| 187 | // Make sure that the polarization vector is perpendicular to the |
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| 188 | // gamma direction. If not |
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| 189 | |
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| 190 | if(!(gammaPolarization0.isOrthogonal(gammaDirection0, 1e-6))||(gammaPolarization0.mag()==0)) |
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| 191 | { // only for testing now |
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| 192 | gammaPolarization0 = GetRandomPolarization(gammaDirection0); |
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| 193 | } |
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| 194 | else |
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| 195 | { |
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| 196 | if ( gammaPolarization0.howOrthogonal(gammaDirection0) != 0) |
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| 197 | { |
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| 198 | gammaPolarization0 = GetPerpendicularPolarization(gammaDirection0, gammaPolarization0); |
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| 199 | } |
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| 200 | } |
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| 201 | |
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| 202 | // End of Protection |
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| 203 | |
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| 204 | // Within energy limit? |
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| 205 | |
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| 206 | if(gammaEnergy0 <= lowEnergyLimit) |
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| 207 | { |
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| 208 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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| 209 | fParticleChange->SetProposedKineticEnergy(0.); |
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| 210 | fParticleChange->ProposeLocalEnergyDeposit(gammaEnergy0); |
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| 211 | return; |
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| 212 | } |
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| 213 | |
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| 214 | G4double E0_m = gammaEnergy0 / electron_mass_c2 ; |
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| 215 | |
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| 216 | // Select randomly one element in the current material |
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| 217 | |
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| 218 | G4int Z = crossSectionHandler->SelectRandomAtom(couple,gammaEnergy0); |
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| 219 | |
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| 220 | // Sample the energy and the polarization of the scattered photon |
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| 221 | |
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| 222 | G4double epsilon, epsilonSq, onecost, sinThetaSqr, greject ; |
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| 223 | |
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| 224 | G4double epsilon0 = 1./(1. + 2*E0_m); |
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| 225 | G4double epsilon0Sq = epsilon0*epsilon0; |
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| 226 | G4double alpha1 = - std::log(epsilon0); |
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| 227 | G4double alpha2 = 0.5*(1.- epsilon0Sq); |
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| 228 | |
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| 229 | G4double wlGamma = h_Planck*c_light/gammaEnergy0; |
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| 230 | G4double gammaEnergy1; |
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| 231 | G4ThreeVector gammaDirection1; |
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| 232 | |
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| 233 | do { |
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| 234 | if ( alpha1/(alpha1+alpha2) > G4UniformRand() ) |
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| 235 | { |
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| 236 | epsilon = std::exp(-alpha1*G4UniformRand()); |
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| 237 | epsilonSq = epsilon*epsilon; |
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| 238 | } |
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| 239 | else |
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| 240 | { |
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| 241 | epsilonSq = epsilon0Sq + (1.- epsilon0Sq)*G4UniformRand(); |
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| 242 | epsilon = std::sqrt(epsilonSq); |
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| 243 | } |
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| 244 | |
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| 245 | onecost = (1.- epsilon)/(epsilon*E0_m); |
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| 246 | sinThetaSqr = onecost*(2.-onecost); |
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| 247 | |
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| 248 | // Protection |
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| 249 | if (sinThetaSqr > 1.) |
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| 250 | { |
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| 251 | G4cout |
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| 252 | << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries " |
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| 253 | << "sin(theta)**2 = " |
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| 254 | << sinThetaSqr |
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| 255 | << "; set to 1" |
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| 256 | << G4endl; |
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| 257 | sinThetaSqr = 1.; |
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| 258 | } |
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| 259 | if (sinThetaSqr < 0.) |
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| 260 | { |
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| 261 | G4cout |
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| 262 | << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries " |
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| 263 | << "sin(theta)**2 = " |
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| 264 | << sinThetaSqr |
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| 265 | << "; set to 0" |
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| 266 | << G4endl; |
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| 267 | sinThetaSqr = 0.; |
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| 268 | } |
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| 269 | // End protection |
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| 270 | |
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| 271 | G4double x = std::sqrt(onecost/2.) / (wlGamma/cm);; |
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| 272 | G4double scatteringFunction = scatterFunctionData->FindValue(x,Z-1); |
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| 273 | greject = (1. - epsilon*sinThetaSqr/(1.+ epsilonSq))*scatteringFunction; |
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| 274 | |
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| 275 | } while(greject < G4UniformRand()*Z); |
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| 276 | |
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| 277 | |
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| 278 | // **************************************************** |
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| 279 | // Phi determination |
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| 280 | // **************************************************** |
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| 281 | |
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| 282 | G4double phi = SetPhi(epsilon,sinThetaSqr); |
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| 283 | |
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| 284 | // |
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| 285 | // scattered gamma angles. ( Z - axis along the parent gamma) |
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| 286 | // |
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| 287 | |
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| 288 | G4double cosTheta = 1. - onecost; |
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| 289 | |
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| 290 | // Protection |
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| 291 | |
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| 292 | if (cosTheta > 1.) |
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| 293 | { |
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| 294 | G4cout |
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| 295 | << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries " |
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| 296 | << "cosTheta = " |
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| 297 | << cosTheta |
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| 298 | << "; set to 1" |
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| 299 | << G4endl; |
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| 300 | cosTheta = 1.; |
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| 301 | } |
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| 302 | if (cosTheta < -1.) |
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| 303 | { |
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| 304 | G4cout |
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| 305 | << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries " |
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| 306 | << "cosTheta = " |
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| 307 | << cosTheta |
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| 308 | << "; set to -1" |
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| 309 | << G4endl; |
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| 310 | cosTheta = -1.; |
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| 311 | } |
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| 312 | // End protection |
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| 313 | |
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| 314 | |
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| 315 | G4double sinTheta = std::sqrt (sinThetaSqr); |
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| 316 | |
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| 317 | // Protection |
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| 318 | if (sinTheta > 1.) |
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| 319 | { |
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| 320 | G4cout |
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| 321 | << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries " |
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| 322 | << "sinTheta = " |
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| 323 | << sinTheta |
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| 324 | << "; set to 1" |
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| 325 | << G4endl; |
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| 326 | sinTheta = 1.; |
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| 327 | } |
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| 328 | if (sinTheta < -1.) |
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| 329 | { |
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| 330 | G4cout |
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| 331 | << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries " |
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| 332 | << "sinTheta = " |
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| 333 | << sinTheta |
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| 334 | << "; set to -1" |
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| 335 | << G4endl; |
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| 336 | sinTheta = -1.; |
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| 337 | } |
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| 338 | // End protection |
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| 339 | |
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| 340 | |
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| 341 | G4double dirx = sinTheta*std::cos(phi); |
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| 342 | G4double diry = sinTheta*std::sin(phi); |
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| 343 | G4double dirz = cosTheta ; |
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| 344 | |
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| 345 | |
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| 346 | // oneCosT , eom |
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| 347 | |
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| 348 | // Doppler broadening - Method based on: |
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| 349 | // Y. Namito, S. Ban and H. Hirayama, |
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| 350 | // "Implementation of the Doppler Broadening of a Compton-Scattered Photon Into the EGS4 Code" |
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| 351 | // NIM A 349, pp. 489-494, 1994 |
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| 352 | |
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| 353 | // Maximum number of sampling iterations |
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| 354 | |
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| 355 | G4int maxDopplerIterations = 1000; |
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| 356 | G4double bindingE = 0.; |
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| 357 | G4double photonEoriginal = epsilon * gammaEnergy0; |
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| 358 | G4double photonE = -1.; |
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| 359 | G4int iteration = 0; |
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| 360 | G4double eMax = gammaEnergy0; |
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| 361 | |
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| 362 | do |
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| 363 | { |
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| 364 | iteration++; |
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| 365 | // Select shell based on shell occupancy |
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| 366 | G4int shell = shellData.SelectRandomShell(Z); |
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| 367 | bindingE = shellData.BindingEnergy(Z,shell); |
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| 368 | |
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| 369 | eMax = gammaEnergy0 - bindingE; |
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| 370 | |
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| 371 | // Randomly sample bound electron momentum (memento: the data set is in Atomic Units) |
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| 372 | G4double pSample = profileData.RandomSelectMomentum(Z,shell); |
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| 373 | // Rescale from atomic units |
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| 374 | G4double pDoppler = pSample * fine_structure_const; |
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| 375 | G4double pDoppler2 = pDoppler * pDoppler; |
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| 376 | G4double var2 = 1. + onecost * E0_m; |
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| 377 | G4double var3 = var2*var2 - pDoppler2; |
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| 378 | G4double var4 = var2 - pDoppler2 * cosTheta; |
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| 379 | G4double var = var4*var4 - var3 + pDoppler2 * var3; |
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| 380 | if (var > 0.) |
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| 381 | { |
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| 382 | G4double varSqrt = std::sqrt(var); |
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| 383 | G4double scale = gammaEnergy0 / var3; |
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| 384 | // Random select either root |
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| 385 | if (G4UniformRand() < 0.5) photonE = (var4 - varSqrt) * scale; |
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| 386 | else photonE = (var4 + varSqrt) * scale; |
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| 387 | } |
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| 388 | else |
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| 389 | { |
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| 390 | photonE = -1.; |
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| 391 | } |
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| 392 | } while ( iteration <= maxDopplerIterations && |
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| 393 | (photonE < 0. || photonE > eMax || photonE < eMax*G4UniformRand()) ); |
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| 394 | |
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| 395 | // End of recalculation of photon energy with Doppler broadening |
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| 396 | // Revert to original if maximum number of iterations threshold has been reached |
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| 397 | if (iteration >= maxDopplerIterations) |
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| 398 | { |
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| 399 | photonE = photonEoriginal; |
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| 400 | bindingE = 0.; |
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| 401 | } |
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| 402 | |
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| 403 | gammaEnergy1 = photonE; |
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| 404 | |
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| 405 | // |
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| 406 | // update G4VParticleChange for the scattered photon |
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| 407 | // |
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| 408 | |
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| 409 | // gammaEnergy1 = epsilon*gammaEnergy0; |
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| 410 | |
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| 411 | |
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| 412 | // New polarization |
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| 413 | |
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| 414 | G4ThreeVector gammaPolarization1 = SetNewPolarization(epsilon, |
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| 415 | sinThetaSqr, |
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| 416 | phi, |
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| 417 | cosTheta); |
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| 418 | |
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| 419 | // Set new direction |
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| 420 | G4ThreeVector tmpDirection1( dirx,diry,dirz ); |
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| 421 | gammaDirection1 = tmpDirection1; |
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| 422 | |
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| 423 | // Change reference frame. |
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| 424 | |
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| 425 | SystemOfRefChange(gammaDirection0,gammaDirection1, |
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| 426 | gammaPolarization0,gammaPolarization1); |
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| 427 | |
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| 428 | if (gammaEnergy1 > 0.) |
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| 429 | { |
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| 430 | fParticleChange->SetProposedKineticEnergy( gammaEnergy1 ) ; |
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| 431 | fParticleChange->ProposeMomentumDirection( gammaDirection1 ); |
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| 432 | fParticleChange->ProposePolarization( gammaPolarization1 ); |
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| 433 | } |
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| 434 | else |
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| 435 | { |
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| 436 | fParticleChange->SetProposedKineticEnergy(0.) ; |
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| 437 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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| 438 | } |
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| 439 | |
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| 440 | // |
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| 441 | // kinematic of the scattered electron |
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| 442 | // |
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| 443 | |
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| 444 | G4double ElecKineEnergy = gammaEnergy0 - gammaEnergy1 -bindingE; |
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| 445 | |
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| 446 | // SI - Removed range test |
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| 447 | |
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| 448 | G4double ElecMomentum = std::sqrt(ElecKineEnergy*(ElecKineEnergy+2.*electron_mass_c2)); |
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| 449 | |
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| 450 | G4ThreeVector ElecDirection((gammaEnergy0 * gammaDirection0 - |
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| 451 | gammaEnergy1 * gammaDirection1) * (1./ElecMomentum)); |
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| 452 | |
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| 453 | fParticleChange->ProposeLocalEnergyDeposit(bindingE); |
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| 454 | |
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| 455 | G4DynamicParticle* dp = new G4DynamicParticle (G4Electron::Electron(),ElecDirection.unit(),ElecKineEnergy) ; |
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| 456 | fvect->push_back(dp); |
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| 457 | |
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| 458 | } |
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| 459 | |
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| 460 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 461 | |
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| 462 | G4double G4LivermorePolarizedComptonModel::SetPhi(G4double energyRate, |
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| 463 | G4double sinSqrTh) |
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| 464 | { |
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| 465 | G4double rand1; |
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| 466 | G4double rand2; |
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| 467 | G4double phiProbability; |
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| 468 | G4double phi; |
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| 469 | G4double a, b; |
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| 470 | |
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| 471 | do |
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| 472 | { |
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| 473 | rand1 = G4UniformRand(); |
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| 474 | rand2 = G4UniformRand(); |
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| 475 | phiProbability=0.; |
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| 476 | phi = twopi*rand1; |
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| 477 | |
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| 478 | a = 2*sinSqrTh; |
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| 479 | b = energyRate + 1/energyRate; |
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| 480 | |
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| 481 | phiProbability = 1 - (a/b)*(std::cos(phi)*std::cos(phi)); |
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| 482 | |
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| 483 | |
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| 484 | |
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| 485 | } |
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| 486 | while ( rand2 > phiProbability ); |
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| 487 | return phi; |
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| 488 | } |
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| 489 | |
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| 490 | |
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| 491 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 492 | |
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| 493 | G4ThreeVector G4LivermorePolarizedComptonModel::SetPerpendicularVector(G4ThreeVector& a) |
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| 494 | { |
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| 495 | G4double dx = a.x(); |
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| 496 | G4double dy = a.y(); |
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| 497 | G4double dz = a.z(); |
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| 498 | G4double x = dx < 0.0 ? -dx : dx; |
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| 499 | G4double y = dy < 0.0 ? -dy : dy; |
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| 500 | G4double z = dz < 0.0 ? -dz : dz; |
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| 501 | if (x < y) { |
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| 502 | return x < z ? G4ThreeVector(-dy,dx,0) : G4ThreeVector(0,-dz,dy); |
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| 503 | }else{ |
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| 504 | return y < z ? G4ThreeVector(dz,0,-dx) : G4ThreeVector(-dy,dx,0); |
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| 505 | } |
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| 506 | } |
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| 507 | |
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| 508 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 509 | |
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| 510 | G4ThreeVector G4LivermorePolarizedComptonModel::GetRandomPolarization(G4ThreeVector& direction0) |
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| 511 | { |
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| 512 | G4ThreeVector d0 = direction0.unit(); |
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| 513 | G4ThreeVector a1 = SetPerpendicularVector(d0); //different orthogonal |
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| 514 | G4ThreeVector a0 = a1.unit(); // unit vector |
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| 515 | |
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| 516 | G4double rand1 = G4UniformRand(); |
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| 517 | |
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| 518 | G4double angle = twopi*rand1; // random polar angle |
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| 519 | G4ThreeVector b0 = d0.cross(a0); // cross product |
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| 520 | |
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| 521 | G4ThreeVector c; |
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| 522 | |
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| 523 | c.setX(std::cos(angle)*(a0.x())+std::sin(angle)*b0.x()); |
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| 524 | c.setY(std::cos(angle)*(a0.y())+std::sin(angle)*b0.y()); |
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| 525 | c.setZ(std::cos(angle)*(a0.z())+std::sin(angle)*b0.z()); |
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| 526 | |
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| 527 | G4ThreeVector c0 = c.unit(); |
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| 528 | |
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| 529 | return c0; |
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| 530 | |
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| 531 | } |
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| 532 | |
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| 533 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 534 | |
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| 535 | G4ThreeVector G4LivermorePolarizedComptonModel::GetPerpendicularPolarization |
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| 536 | (const G4ThreeVector& gammaDirection, const G4ThreeVector& gammaPolarization) const |
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| 537 | { |
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| 538 | |
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| 539 | // |
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| 540 | // The polarization of a photon is always perpendicular to its momentum direction. |
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| 541 | // Therefore this function removes those vector component of gammaPolarization, which |
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| 542 | // points in direction of gammaDirection |
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| 543 | // |
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| 544 | // Mathematically we search the projection of the vector a on the plane E, where n is the |
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| 545 | // plains normal vector. |
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| 546 | // The basic equation can be found in each geometry book (e.g. Bronstein): |
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| 547 | // p = a - (a o n)/(n o n)*n |
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| 548 | |
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| 549 | return gammaPolarization - gammaPolarization.dot(gammaDirection)/gammaDirection.dot(gammaDirection) * gammaDirection; |
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| 550 | } |
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| 551 | |
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| 552 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 553 | |
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| 554 | G4ThreeVector G4LivermorePolarizedComptonModel::SetNewPolarization(G4double epsilon, |
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| 555 | G4double sinSqrTh, |
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| 556 | G4double phi, |
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| 557 | G4double costheta) |
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| 558 | { |
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| 559 | G4double rand1; |
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| 560 | G4double rand2; |
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| 561 | G4double cosPhi = std::cos(phi); |
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| 562 | G4double sinPhi = std::sin(phi); |
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| 563 | G4double sinTheta = std::sqrt(sinSqrTh); |
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| 564 | G4double cosSqrPhi = cosPhi*cosPhi; |
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| 565 | // G4double cossqrth = 1.-sinSqrTh; |
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| 566 | // G4double sinsqrphi = sinPhi*sinPhi; |
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| 567 | G4double normalisation = std::sqrt(1. - cosSqrPhi*sinSqrTh); |
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| 568 | |
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| 569 | |
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| 570 | // Determination of Theta |
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| 571 | |
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| 572 | // ---- MGP ---- Commented out the following 3 lines to avoid compilation |
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| 573 | // warnings (unused variables) |
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| 574 | // G4double thetaProbability; |
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| 575 | G4double theta; |
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| 576 | // G4double a, b; |
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| 577 | // G4double cosTheta; |
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| 578 | |
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| 579 | /* |
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| 580 | |
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| 581 | depaola method |
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| 582 | |
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| 583 | do |
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| 584 | { |
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| 585 | rand1 = G4UniformRand(); |
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| 586 | rand2 = G4UniformRand(); |
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| 587 | thetaProbability=0.; |
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| 588 | theta = twopi*rand1; |
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| 589 | a = 4*normalisation*normalisation; |
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| 590 | b = (epsilon + 1/epsilon) - 2; |
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| 591 | thetaProbability = (b + a*std::cos(theta)*std::cos(theta))/(a+b); |
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| 592 | cosTheta = std::cos(theta); |
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| 593 | } |
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| 594 | while ( rand2 > thetaProbability ); |
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| 595 | |
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| 596 | G4double cosBeta = cosTheta; |
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| 597 | |
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| 598 | */ |
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| 599 | |
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| 600 | |
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| 601 | // Dan Xu method (IEEE TNS, 52, 1160 (2005)) |
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| 602 | |
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| 603 | rand1 = G4UniformRand(); |
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| 604 | rand2 = G4UniformRand(); |
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| 605 | |
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| 606 | if (rand1<(epsilon+1.0/epsilon-2)/(2.0*(epsilon+1.0/epsilon)-4.0*sinSqrTh*cosSqrPhi)) |
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| 607 | { |
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| 608 | if (rand2<0.5) |
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| 609 | theta = pi/2.0; |
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| 610 | else |
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| 611 | theta = 3.0*pi/2.0; |
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| 612 | } |
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| 613 | else |
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| 614 | { |
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| 615 | if (rand2<0.5) |
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| 616 | theta = 0; |
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| 617 | else |
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| 618 | theta = pi; |
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| 619 | } |
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| 620 | G4double cosBeta = std::cos(theta); |
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| 621 | G4double sinBeta = std::sqrt(1-cosBeta*cosBeta); |
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| 622 | |
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| 623 | G4ThreeVector gammaPolarization1; |
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| 624 | |
---|
| 625 | G4double xParallel = normalisation*cosBeta; |
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| 626 | G4double yParallel = -(sinSqrTh*cosPhi*sinPhi)*cosBeta/normalisation; |
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| 627 | G4double zParallel = -(costheta*sinTheta*cosPhi)*cosBeta/normalisation; |
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| 628 | G4double xPerpendicular = 0.; |
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| 629 | G4double yPerpendicular = (costheta)*sinBeta/normalisation; |
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| 630 | G4double zPerpendicular = -(sinTheta*sinPhi)*sinBeta/normalisation; |
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| 631 | |
---|
| 632 | G4double xTotal = (xParallel + xPerpendicular); |
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| 633 | G4double yTotal = (yParallel + yPerpendicular); |
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| 634 | G4double zTotal = (zParallel + zPerpendicular); |
---|
| 635 | |
---|
| 636 | gammaPolarization1.setX(xTotal); |
---|
| 637 | gammaPolarization1.setY(yTotal); |
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| 638 | gammaPolarization1.setZ(zTotal); |
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| 639 | |
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| 640 | return gammaPolarization1; |
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| 641 | |
---|
| 642 | } |
---|
| 643 | |
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| 644 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 645 | |
---|
| 646 | void G4LivermorePolarizedComptonModel::SystemOfRefChange(G4ThreeVector& direction0, |
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| 647 | G4ThreeVector& direction1, |
---|
| 648 | G4ThreeVector& polarization0, |
---|
| 649 | G4ThreeVector& polarization1) |
---|
| 650 | { |
---|
| 651 | // direction0 is the original photon direction ---> z |
---|
| 652 | // polarization0 is the original photon polarization ---> x |
---|
| 653 | // need to specify y axis in the real reference frame ---> y |
---|
| 654 | G4ThreeVector Axis_Z0 = direction0.unit(); |
---|
| 655 | G4ThreeVector Axis_X0 = polarization0.unit(); |
---|
| 656 | G4ThreeVector Axis_Y0 = (Axis_Z0.cross(Axis_X0)).unit(); // to be confirmed; |
---|
| 657 | |
---|
| 658 | G4double direction_x = direction1.getX(); |
---|
| 659 | G4double direction_y = direction1.getY(); |
---|
| 660 | G4double direction_z = direction1.getZ(); |
---|
| 661 | |
---|
| 662 | direction1 = (direction_x*Axis_X0 + direction_y*Axis_Y0 + direction_z*Axis_Z0).unit(); |
---|
| 663 | G4double polarization_x = polarization1.getX(); |
---|
| 664 | G4double polarization_y = polarization1.getY(); |
---|
| 665 | G4double polarization_z = polarization1.getZ(); |
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| 666 | |
---|
| 667 | polarization1 = (polarization_x*Axis_X0 + polarization_y*Axis_Y0 + polarization_z*Axis_Z0).unit(); |
---|
| 668 | |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 672 | |
---|
| 673 | G4double G4LivermorePolarizedComptonModel::GetMeanFreePath(const G4Track& track, |
---|
| 674 | G4double, |
---|
| 675 | G4ForceCondition*) |
---|
| 676 | { |
---|
| 677 | const G4DynamicParticle* photon = track.GetDynamicParticle(); |
---|
| 678 | G4double energy = photon->GetKineticEnergy(); |
---|
| 679 | const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple(); |
---|
| 680 | size_t materialIndex = couple->GetIndex(); |
---|
| 681 | G4double meanFreePath; |
---|
| 682 | if (energy > highEnergyLimit) meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex); |
---|
| 683 | else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX; |
---|
| 684 | else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex); |
---|
| 685 | return meanFreePath; |
---|
| 686 | } |
---|
| 687 | |
---|
| 688 | |
---|