[1058] | 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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[1192] | 26 | // $Id: G4LivermoreBremsstrahlungModel.cc,v 1.6 2009/06/11 15:47:08 mantero Exp $ |
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[1228] | 27 | // GEANT4 tag $Name: geant4-09-03 $ |
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[1058] | 28 | // |
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| 29 | // Author: Luciano Pandola |
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| 30 | // |
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| 31 | // History: |
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| 32 | // -------- |
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| 33 | // 03 Mar 2009 L Pandola Migration from process to model |
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| 34 | // 12 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries: |
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| 35 | // - apply internal high-energy limit only in constructor |
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| 36 | // - do not apply low-energy limit (default is 0) |
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| 37 | // - added MinEnergyCut method |
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| 38 | // - do not change track status |
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| 39 | // - do not initialize element selectors |
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| 40 | // - use cut value from the interface |
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| 41 | // - fixed bug in sampling of angles between keV and MeV |
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| 42 | // 19 May 2009 L Pandola Explicitely set to zero pointers deleted in |
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| 43 | // Initialise(), since they might be checked later on |
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| 44 | // |
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| 45 | |
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| 46 | #include "G4LivermoreBremsstrahlungModel.hh" |
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| 47 | #include "G4ParticleDefinition.hh" |
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| 48 | #include "G4MaterialCutsCouple.hh" |
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| 49 | |
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| 50 | #include "G4DynamicParticle.hh" |
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| 51 | #include "G4Element.hh" |
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| 52 | #include "G4Gamma.hh" |
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| 53 | #include "G4Electron.hh" |
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| 54 | #include "G4SemiLogInterpolation.hh" |
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| 55 | // |
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| 56 | #include "G4VBremAngularDistribution.hh" |
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| 57 | #include "G4ModifiedTsai.hh" |
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| 58 | #include "G4Generator2BS.hh" |
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| 59 | #include "G4Generator2BN.hh" |
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| 60 | // |
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| 61 | #include "G4BremsstrahlungCrossSectionHandler.hh" |
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| 62 | // |
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| 63 | #include "G4VEnergySpectrum.hh" |
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| 64 | #include "G4eBremsstrahlungSpectrum.hh" |
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| 65 | |
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| 66 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 67 | |
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| 68 | |
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| 69 | G4LivermoreBremsstrahlungModel::G4LivermoreBremsstrahlungModel(const G4ParticleDefinition*, |
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| 70 | const G4String& nam) |
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| 71 | :G4VEmModel(nam),isInitialised(false),crossSectionHandler(0), |
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| 72 | energySpectrum(0) |
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| 73 | { |
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| 74 | fIntrinsicLowEnergyLimit = 10.0*eV; |
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| 75 | fIntrinsicHighEnergyLimit = 100.0*GeV; |
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| 76 | fNBinEnergyLoss = 360; |
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| 77 | // SetLowEnergyLimit(fIntrinsicLowEnergyLimit); |
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| 78 | SetHighEnergyLimit(fIntrinsicHighEnergyLimit); |
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| 79 | // |
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| 80 | verboseLevel = 0; |
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| 81 | // |
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| 82 | generatorName = "tsai"; |
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| 83 | angularDistribution = new G4ModifiedTsai("TsaiGenerator"); //default generator |
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| 84 | // |
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| 85 | TsaiAngularDistribution = new G4ModifiedTsai("TsaiGenerator"); |
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| 86 | // |
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| 87 | } |
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| 88 | |
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| 89 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 90 | |
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| 91 | G4LivermoreBremsstrahlungModel::~G4LivermoreBremsstrahlungModel() |
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| 92 | { |
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| 93 | if (crossSectionHandler) delete crossSectionHandler; |
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| 94 | if (energySpectrum) delete energySpectrum; |
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| 95 | energyBins.clear(); |
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| 96 | delete angularDistribution; |
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| 97 | delete TsaiAngularDistribution; |
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| 98 | } |
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| 99 | |
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| 100 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 101 | |
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| 102 | void G4LivermoreBremsstrahlungModel::Initialise(const G4ParticleDefinition* particle, |
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| 103 | const G4DataVector& cuts) |
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| 104 | { |
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| 105 | //Check that the Livermore Bremsstrahlung is NOT attached to e+ |
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| 106 | if (particle != G4Electron::Electron()) |
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| 107 | { |
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| 108 | G4cout << "ERROR: Livermore Bremsstrahlung Model is applicable only to electrons" |
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| 109 | << G4endl; |
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| 110 | G4cout << "It cannot be registered to " << particle->GetParticleName() << G4endl; |
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| 111 | G4Exception(); |
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| 112 | } |
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| 113 | //Prepare energy spectrum |
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| 114 | if (energySpectrum) |
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| 115 | { |
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| 116 | delete energySpectrum; |
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| 117 | energySpectrum = 0; |
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| 118 | } |
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| 119 | |
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| 120 | energyBins.clear(); |
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| 121 | for(size_t i=0; i<15; i++) |
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| 122 | { |
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| 123 | G4double x = 0.1*((G4double)i); |
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| 124 | if(i == 0) x = 0.01; |
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| 125 | if(i == 10) x = 0.95; |
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| 126 | if(i == 11) x = 0.97; |
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| 127 | if(i == 12) x = 0.99; |
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| 128 | if(i == 13) x = 0.995; |
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| 129 | if(i == 14) x = 1.0; |
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| 130 | energyBins.push_back(x); |
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| 131 | } |
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| 132 | const G4String dataName("/brem/br-sp.dat"); |
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| 133 | energySpectrum = new G4eBremsstrahlungSpectrum(energyBins,dataName); |
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| 134 | |
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| 135 | if (verboseLevel > 0) |
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| 136 | G4cout << "G4eBremsstrahlungSpectrum is initialized" << G4endl; |
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| 137 | |
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| 138 | //Initialize cross section handler |
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| 139 | if (crossSectionHandler) |
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| 140 | { |
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| 141 | delete crossSectionHandler; |
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| 142 | crossSectionHandler = 0; |
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| 143 | } |
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| 144 | G4VDataSetAlgorithm* interpolation = new G4SemiLogInterpolation(); |
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| 145 | crossSectionHandler = new G4BremsstrahlungCrossSectionHandler(energySpectrum,interpolation); |
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| 146 | crossSectionHandler->Initialise(0,LowEnergyLimit(),HighEnergyLimit(), |
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| 147 | fNBinEnergyLoss); |
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| 148 | crossSectionHandler->Clear(); |
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| 149 | crossSectionHandler->LoadShellData("brem/br-cs-"); |
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| 150 | //This is used to retrieve cross section values later on |
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| 151 | crossSectionHandler->BuildMeanFreePathForMaterials(&cuts); |
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| 152 | |
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| 153 | if (verboseLevel > 0) |
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| 154 | { |
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| 155 | G4cout << "Livermore Bremsstrahlung model is initialized " << G4endl |
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| 156 | << "Energy range: " |
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| 157 | << LowEnergyLimit() / keV << " keV - " |
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| 158 | << HighEnergyLimit() / GeV << " GeV" |
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| 159 | << G4endl; |
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| 160 | } |
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| 161 | |
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| 162 | if (verboseLevel > 1) |
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| 163 | { |
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| 164 | G4cout << "Cross section data: " << G4endl; |
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| 165 | crossSectionHandler->PrintData(); |
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| 166 | G4cout << "Parameters: " << G4endl; |
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| 167 | energySpectrum->PrintData(); |
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| 168 | } |
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| 169 | |
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| 170 | if(isInitialised) return; |
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| 171 | fParticleChange = GetParticleChangeForLoss(); |
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| 172 | isInitialised = true; |
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| 173 | } |
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| 174 | |
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| 175 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 176 | |
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| 177 | G4double G4LivermoreBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition*, |
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| 178 | const G4MaterialCutsCouple*) |
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| 179 | { |
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| 180 | return 250.*eV; |
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| 181 | } |
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| 182 | |
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| 183 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 184 | |
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| 185 | G4double |
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| 186 | G4LivermoreBremsstrahlungModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*, |
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| 187 | G4double energy, |
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| 188 | G4double Z, G4double, |
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| 189 | G4double cutEnergy, |
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| 190 | G4double) |
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| 191 | { |
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| 192 | G4int iZ = (G4int) Z; |
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| 193 | if (!crossSectionHandler) |
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| 194 | { |
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| 195 | G4cout << "G4LivermoreBremsstrahlungModel::ComputeCrossSectionPerAtom" << G4endl; |
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| 196 | G4cout << "The cross section handler is not correctly initialized" << G4endl; |
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| 197 | G4Exception(); |
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| 198 | } |
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| 199 | |
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| 200 | //The cut is already included in the crossSectionHandler |
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| 201 | G4double cs = |
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| 202 | crossSectionHandler->GetCrossSectionAboveThresholdForElement(energy,cutEnergy,iZ); |
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| 203 | |
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| 204 | if (verboseLevel > 1) |
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| 205 | { |
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| 206 | G4cout << "G4LivermoreBremsstrahlungModel " << G4endl; |
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| 207 | G4cout << "Cross section for gamma emission > " << cutEnergy/keV << " keV at " << |
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| 208 | energy/keV << " keV and Z = " << iZ << " --> " << cs/barn << " barn" << G4endl; |
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| 209 | } |
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| 210 | return cs; |
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| 211 | } |
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| 212 | |
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| 213 | |
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| 214 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 215 | |
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| 216 | G4double G4LivermoreBremsstrahlungModel::ComputeDEDXPerVolume(const G4Material* material, |
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| 217 | const G4ParticleDefinition* , |
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| 218 | G4double kineticEnergy, |
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| 219 | G4double cutEnergy) |
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| 220 | { |
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| 221 | G4double sPower = 0.0; |
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| 222 | |
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| 223 | const G4ElementVector* theElementVector = material->GetElementVector(); |
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| 224 | size_t NumberOfElements = material->GetNumberOfElements() ; |
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| 225 | const G4double* theAtomicNumDensityVector = |
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| 226 | material->GetAtomicNumDensityVector(); |
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| 227 | |
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| 228 | // loop for elements in the material |
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| 229 | for (size_t iel=0; iel<NumberOfElements; iel++ ) |
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| 230 | { |
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| 231 | G4int iZ = (G4int)((*theElementVector)[iel]->GetZ()); |
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| 232 | G4double e = energySpectrum->AverageEnergy(iZ, 0.0,cutEnergy, |
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| 233 | kineticEnergy); |
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| 234 | G4double cs= crossSectionHandler->FindValue(iZ,kineticEnergy); |
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| 235 | sPower += e * cs * theAtomicNumDensityVector[iel]; |
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| 236 | } |
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| 237 | |
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| 238 | if (verboseLevel > 2) |
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| 239 | { |
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| 240 | G4cout << "G4LivermoreBremsstrahlungModel " << G4endl; |
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| 241 | G4cout << "Stopping power < " << cutEnergy/keV << " keV at " << |
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| 242 | kineticEnergy/keV << " keV = " << sPower/(keV/mm) << " keV/mm" << G4endl; |
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| 243 | } |
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| 244 | |
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| 245 | return sPower; |
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| 246 | } |
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| 247 | |
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| 248 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 249 | |
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| 250 | void G4LivermoreBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
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| 251 | const G4MaterialCutsCouple* couple, |
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| 252 | const G4DynamicParticle* aDynamicParticle, |
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| 253 | G4double energyCut, |
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| 254 | G4double) |
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| 255 | { |
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| 256 | |
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| 257 | G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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| 258 | |
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| 259 | // this is neede for pathalogical cases of no ionisation |
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| 260 | if (kineticEnergy <= fIntrinsicLowEnergyLimit) |
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| 261 | { |
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| 262 | fParticleChange->SetProposedKineticEnergy(0.); |
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| 263 | fParticleChange->ProposeLocalEnergyDeposit(kineticEnergy); |
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| 264 | return; |
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| 265 | } |
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| 266 | |
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| 267 | //Sample material |
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| 268 | G4int Z = crossSectionHandler->SelectRandomAtom(couple, kineticEnergy); |
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| 269 | |
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| 270 | //Sample gamma energy |
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| 271 | G4double tGamma = energySpectrum->SampleEnergy(Z, energyCut, kineticEnergy, kineticEnergy); |
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| 272 | G4double totalEnergy = kineticEnergy + electron_mass_c2; |
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| 273 | G4double finalEnergy = kineticEnergy - tGamma; // electron final energy |
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| 274 | G4double theta = 0; |
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| 275 | |
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| 276 | if (tGamma == 0.) //nothing happens |
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| 277 | return; |
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| 278 | |
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| 279 | //Sample gamma direction |
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| 280 | //Use alternative algorithms, if it is the case. |
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| 281 | if((kineticEnergy < MeV && kineticEnergy > keV)) |
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| 282 | { |
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| 283 | theta = angularDistribution->PolarAngle(kineticEnergy,finalEnergy,Z); |
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| 284 | } |
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| 285 | else |
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| 286 | //Otherwise, use tsai |
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| 287 | { |
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| 288 | theta = TsaiAngularDistribution->PolarAngle(kineticEnergy,finalEnergy,Z); |
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| 289 | } |
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| 290 | |
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| 291 | G4double phi = twopi * G4UniformRand(); |
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| 292 | G4double dirZ = std::cos(theta); |
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| 293 | G4double sinTheta = std::sqrt(1. - dirZ*dirZ); |
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| 294 | G4double dirX = sinTheta*std::cos(phi); |
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| 295 | G4double dirY = sinTheta*std::sin(phi); |
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| 296 | |
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| 297 | G4ThreeVector gammaDirection (dirX, dirY, dirZ); |
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| 298 | G4ThreeVector electronDirection = aDynamicParticle->GetMomentumDirection(); |
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| 299 | |
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| 300 | //Update the incident particle |
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| 301 | gammaDirection.rotateUz(electronDirection); |
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| 302 | |
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| 303 | if (finalEnergy < 0.) |
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| 304 | { |
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| 305 | // Kinematic problem |
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| 306 | tGamma = kineticEnergy; |
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| 307 | fParticleChange->SetProposedKineticEnergy(0.); |
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| 308 | } |
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| 309 | else |
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| 310 | { |
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| 311 | G4double momentum = std::sqrt((totalEnergy + electron_mass_c2)*kineticEnergy); |
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| 312 | G4double finalX = momentum*electronDirection.x() - tGamma*gammaDirection.x(); |
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| 313 | G4double finalY = momentum*electronDirection.y() - tGamma*gammaDirection.y(); |
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| 314 | G4double finalZ = momentum*electronDirection.z() - tGamma*gammaDirection.z(); |
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| 315 | G4double norm = 1./std::sqrt(finalX*finalX + finalY*finalY + finalZ*finalZ); |
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| 316 | |
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| 317 | fParticleChange->ProposeMomentumDirection(finalX*norm, finalY*norm, finalZ*norm); |
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| 318 | fParticleChange->SetProposedKineticEnergy(finalEnergy); |
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| 319 | } |
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| 320 | |
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| 321 | //Generate the bremsstrahlung gamma |
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| 322 | G4DynamicParticle* aGamma= new G4DynamicParticle (G4Gamma::Gamma(), |
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| 323 | gammaDirection, tGamma); |
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| 324 | fvect->push_back(aGamma); |
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| 325 | |
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| 326 | if (verboseLevel > 1) |
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| 327 | { |
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| 328 | G4cout << "-----------------------------------------------------------" << G4endl; |
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| 329 | G4cout << "Energy balance from G4LivermoreBremsstrahlung" << G4endl; |
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| 330 | G4cout << "Incoming primary energy: " << kineticEnergy/keV << " keV" << G4endl; |
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| 331 | G4cout << "-----------------------------------------------------------" << G4endl; |
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| 332 | G4cout << "Outgoing primary energy: " << finalEnergy/keV << " keV" << G4endl; |
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| 333 | G4cout << "Gamma ray " << tGamma/keV << " keV" << G4endl; |
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| 334 | G4cout << "Total final state: " << (finalEnergy+tGamma)/keV << " keV" << G4endl; |
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| 335 | G4cout << "-----------------------------------------------------------" << G4endl; |
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| 336 | } |
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| 337 | if (verboseLevel > 0) |
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| 338 | { |
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| 339 | G4double energyDiff = std::fabs(finalEnergy+tGamma-kineticEnergy); |
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| 340 | if (energyDiff > 0.05*keV) |
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| 341 | G4cout << "G4LivermoreBremsstrahlung WARNING: problem with energy conservation: " |
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| 342 | << (finalEnergy+tGamma)/keV << " keV (final) vs. " |
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| 343 | << kineticEnergy/keV << " keV (initial)" << G4endl; |
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| 344 | } |
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| 345 | return; |
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| 346 | } |
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| 347 | |
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| 348 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 349 | |
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| 350 | void |
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| 351 | G4LivermoreBremsstrahlungModel::SetAngularGenerator(G4VBremAngularDistribution* distribution) |
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| 352 | { |
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| 353 | if(angularDistribution == distribution) return; |
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| 354 | if(angularDistribution) delete angularDistribution; |
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| 355 | angularDistribution = distribution; |
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| 356 | angularDistribution->PrintGeneratorInformation(); |
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| 357 | } |
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| 358 | |
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| 359 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 360 | |
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| 361 | void G4LivermoreBremsstrahlungModel::SetAngularGenerator(const G4String& name) |
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| 362 | { |
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| 363 | if(name == generatorName) return; |
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| 364 | if (name == "tsai") |
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| 365 | { |
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| 366 | delete angularDistribution; |
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| 367 | angularDistribution = new G4ModifiedTsai("TsaiGenerator"); |
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| 368 | generatorName = name; |
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| 369 | } |
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| 370 | else if (name == "2bn") |
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| 371 | { |
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| 372 | delete angularDistribution; |
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| 373 | angularDistribution = new G4Generator2BN("2BNGenerator"); |
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| 374 | generatorName = name; |
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| 375 | } |
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| 376 | else if (name == "2bs") |
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| 377 | { |
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| 378 | delete angularDistribution; |
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| 379 | angularDistribution = new G4Generator2BS("2BSGenerator"); |
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| 380 | generatorName = name; |
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| 381 | } |
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| 382 | else |
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| 383 | { |
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| 384 | G4cout << "### G4LivermoreBremsstrahlungModel::SetAngularGenerator WARNING:" |
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| 385 | << " generator <" << name << "> is not known" << G4endl; |
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| 386 | return; |
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| 387 | |
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| 388 | } |
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| 389 | |
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| 390 | angularDistribution->PrintGeneratorInformation(); |
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| 391 | } |
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