[819] | 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: G4LowEnergyBremsstrahlung.cc,v 1.74 2009/06/11 15:47:08 mantero Exp $ |
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[1347] | 27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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[819] | 28 | // |
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| 29 | // -------------------------------------------------------------- |
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| 30 | // |
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| 31 | // File name: G4LowEnergyBremsstrahlung |
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| 32 | // |
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| 33 | // Author: Alessandra Forti, Vladimir Ivanchenko |
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| 34 | // |
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| 35 | // Creation date: March 1999 |
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| 36 | // |
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| 37 | // Modifications: |
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| 38 | // 18.04.2000 V.L. |
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| 39 | // - First implementation of continuous energy loss. |
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| 40 | // 17.02.2000 Veronique Lefebure |
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| 41 | // - correct bug : the gamma energy was not deposited when the gamma was |
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| 42 | // not produced when its energy was < cutForLowEnergySecondaryPhotons |
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| 43 | // |
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| 44 | // Added Livermore data table construction methods A. Forti |
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| 45 | // Modified BuildMeanFreePath to read new data tables A. Forti |
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| 46 | // Modified PostStepDoIt to insert sampling with with EEDL data A. Forti |
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| 47 | // Added SelectRandomAtom A. Forti |
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| 48 | // Added map of the elements A. Forti |
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| 49 | // 20.09.00 update printout V.Ivanchenko |
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| 50 | // 24.04.01 V.Ivanchenko remove RogueWave |
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| 51 | // 29.09.2001 V.Ivanchenko: major revision based on design iteration |
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| 52 | // 10.10.2001 MGP Revision to improve code quality and consistency with design |
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| 53 | // 18.10.2001 MGP Revision to improve code quality |
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| 54 | // 28.10.2001 VI Update printout |
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| 55 | // 29.11.2001 VI New parametrisation |
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| 56 | // 30.07.2002 VI Fix in restricted energy loss |
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| 57 | // 21.01.2003 VI Cut per region |
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| 58 | // 21.02.2003 V.Ivanchenko Energy bins for spectrum are defined here |
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| 59 | // 28.02.03 V.Ivanchenko Filename is defined in the constructor |
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| 60 | // 24.03.2003 P.Rodrigues Changes to accommodate new angular generators |
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| 61 | // 20.05.2003 MGP Removed memory leak related to angularDistribution |
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| 62 | // 06.11.2003 MGP Improved user interface to select angular distribution model |
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| 63 | // |
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| 64 | // -------------------------------------------------------------- |
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| 65 | |
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| 66 | #include "G4LowEnergyBremsstrahlung.hh" |
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| 67 | #include "G4eBremsstrahlungSpectrum.hh" |
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| 68 | #include "G4BremsstrahlungCrossSectionHandler.hh" |
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| 69 | #include "G4VBremAngularDistribution.hh" |
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| 70 | #include "G4ModifiedTsai.hh" |
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| 71 | #include "G4Generator2BS.hh" |
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| 72 | #include "G4Generator2BN.hh" |
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| 73 | #include "G4VDataSetAlgorithm.hh" |
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| 74 | #include "G4LogLogInterpolation.hh" |
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| 75 | #include "G4VEMDataSet.hh" |
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| 76 | #include "G4EnergyLossTables.hh" |
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| 77 | #include "G4UnitsTable.hh" |
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| 78 | #include "G4Electron.hh" |
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| 79 | #include "G4Gamma.hh" |
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| 80 | #include "G4ProductionCutsTable.hh" |
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| 81 | |
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| 82 | |
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| 83 | G4LowEnergyBremsstrahlung::G4LowEnergyBremsstrahlung(const G4String& nam) |
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| 84 | : G4eLowEnergyLoss(nam), |
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| 85 | crossSectionHandler(0), |
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| 86 | theMeanFreePath(0), |
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| 87 | energySpectrum(0) |
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| 88 | { |
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| 89 | cutForPhotons = 0.; |
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| 90 | verboseLevel = 0; |
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| 91 | generatorName = "tsai"; |
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| 92 | angularDistribution = new G4ModifiedTsai("TsaiGenerator"); // default generator |
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| 93 | // angularDistribution->PrintGeneratorInformation(); |
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| 94 | TsaiAngularDistribution = new G4ModifiedTsai("TsaiGenerator"); |
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[1055] | 95 | |
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| 96 | |
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| 97 | G4cout << G4endl; |
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| 98 | G4cout << "*******************************************************************************" << G4endl; |
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| 99 | G4cout << "*******************************************************************************" << G4endl; |
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| 100 | G4cout << " The class G4LowEnergyBremsstrahlung is NOT SUPPORTED ANYMORE. " << G4endl; |
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| 101 | G4cout << " It will be REMOVED with the next major release of Geant4. " << G4endl; |
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| 102 | G4cout << " Please consult: https://twiki.cern.ch/twiki/bin/view/Geant4/LoweProcesses" << G4endl; |
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| 103 | G4cout << "*******************************************************************************" << G4endl; |
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| 104 | G4cout << "*******************************************************************************" << G4endl; |
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| 105 | G4cout << G4endl; |
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[819] | 106 | } |
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| 107 | |
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| 108 | /* |
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| 109 | G4LowEnergyBremsstrahlung::G4LowEnergyBremsstrahlung(const G4String& nam, G4VBremAngularDistribution* distribution) |
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| 110 | : G4eLowEnergyLoss(nam), |
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| 111 | crossSectionHandler(0), |
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| 112 | theMeanFreePath(0), |
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| 113 | energySpectrum(0), |
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| 114 | angularDistribution(distribution) |
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| 115 | { |
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| 116 | cutForPhotons = 0.; |
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| 117 | verboseLevel = 0; |
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| 118 | |
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| 119 | angularDistribution->PrintGeneratorInformation(); |
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| 120 | |
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| 121 | TsaiAngularDistribution = new G4ModifiedTsai("TsaiGenerator"); |
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| 122 | } |
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| 123 | */ |
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| 124 | |
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| 125 | G4LowEnergyBremsstrahlung::~G4LowEnergyBremsstrahlung() |
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| 126 | { |
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| 127 | if(crossSectionHandler) delete crossSectionHandler; |
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| 128 | if(energySpectrum) delete energySpectrum; |
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| 129 | if(theMeanFreePath) delete theMeanFreePath; |
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| 130 | delete angularDistribution; |
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| 131 | delete TsaiAngularDistribution; |
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| 132 | energyBins.clear(); |
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| 133 | } |
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| 134 | |
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| 135 | |
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| 136 | void G4LowEnergyBremsstrahlung::BuildPhysicsTable(const G4ParticleDefinition& aParticleType) |
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| 137 | { |
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| 138 | if(verboseLevel > 0) { |
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| 139 | G4cout << "G4LowEnergyBremsstrahlung::BuildPhysicsTable start" |
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| 140 | << G4endl; |
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| 141 | } |
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| 142 | |
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| 143 | cutForSecondaryPhotons.clear(); |
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| 144 | |
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| 145 | // Create and fill BremsstrahlungParameters once |
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| 146 | if( energySpectrum != 0 ) delete energySpectrum; |
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| 147 | energyBins.clear(); |
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| 148 | for(size_t i=0; i<15; i++) { |
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| 149 | G4double x = 0.1*((G4double)i); |
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| 150 | if(i == 0) x = 0.01; |
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| 151 | if(i == 10) x = 0.95; |
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| 152 | if(i == 11) x = 0.97; |
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| 153 | if(i == 12) x = 0.99; |
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| 154 | if(i == 13) x = 0.995; |
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| 155 | if(i == 14) x = 1.0; |
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| 156 | energyBins.push_back(x); |
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| 157 | } |
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| 158 | const G4String dataName("/brem/br-sp.dat"); |
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| 159 | energySpectrum = new G4eBremsstrahlungSpectrum(energyBins,dataName); |
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| 160 | |
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| 161 | if(verboseLevel > 0) { |
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| 162 | G4cout << "G4LowEnergyBremsstrahlungSpectrum is initialized" |
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| 163 | << G4endl; |
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| 164 | } |
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| 165 | |
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| 166 | // Create and fill G4CrossSectionHandler once |
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| 167 | |
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| 168 | if( crossSectionHandler != 0 ) delete crossSectionHandler; |
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| 169 | G4VDataSetAlgorithm* interpolation = new G4LogLogInterpolation(); |
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| 170 | G4double lowKineticEnergy = GetLowerBoundEloss(); |
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| 171 | G4double highKineticEnergy = GetUpperBoundEloss(); |
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| 172 | G4int totBin = GetNbinEloss(); |
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| 173 | crossSectionHandler = new G4BremsstrahlungCrossSectionHandler(energySpectrum, interpolation); |
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| 174 | crossSectionHandler->Initialise(0,lowKineticEnergy, highKineticEnergy, totBin); |
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| 175 | crossSectionHandler->LoadShellData("brem/br-cs-"); |
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| 176 | |
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| 177 | if (verboseLevel > 0) { |
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| 178 | G4cout << GetProcessName() |
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| 179 | << " is created; Cross section data: " |
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| 180 | << G4endl; |
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| 181 | crossSectionHandler->PrintData(); |
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| 182 | G4cout << "Parameters: " |
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| 183 | << G4endl; |
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| 184 | energySpectrum->PrintData(); |
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| 185 | } |
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| 186 | |
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| 187 | // Build loss table for Bremsstrahlung |
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| 188 | |
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| 189 | BuildLossTable(aParticleType); |
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| 190 | |
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| 191 | if(verboseLevel > 0) { |
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| 192 | G4cout << "The loss table is built" |
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| 193 | << G4endl; |
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| 194 | } |
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| 195 | |
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| 196 | if (&aParticleType==G4Electron::Electron()) { |
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| 197 | |
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| 198 | RecorderOfElectronProcess[CounterOfElectronProcess] = (*this).theLossTable; |
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| 199 | CounterOfElectronProcess++; |
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| 200 | PrintInfoDefinition(); |
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| 201 | |
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| 202 | } else { |
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| 203 | |
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| 204 | RecorderOfPositronProcess[CounterOfPositronProcess] = (*this).theLossTable; |
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| 205 | CounterOfPositronProcess++; |
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| 206 | } |
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| 207 | |
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| 208 | // Build mean free path data using cut values |
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| 209 | |
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| 210 | if( theMeanFreePath != 0 ) delete theMeanFreePath; |
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| 211 | theMeanFreePath = crossSectionHandler-> |
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| 212 | BuildMeanFreePathForMaterials(&cutForSecondaryPhotons); |
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| 213 | |
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| 214 | if(verboseLevel > 0) { |
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| 215 | G4cout << "The MeanFreePath table is built" |
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| 216 | << G4endl; |
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| 217 | } |
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| 218 | |
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| 219 | // Build common DEDX table for all ionisation processes |
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| 220 | |
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| 221 | BuildDEDXTable(aParticleType); |
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| 222 | |
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| 223 | if(verboseLevel > 0) { |
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| 224 | G4cout << "G4LowEnergyBremsstrahlung::BuildPhysicsTable end" |
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| 225 | << G4endl; |
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| 226 | } |
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| 227 | |
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| 228 | } |
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| 229 | |
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| 230 | |
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| 231 | void G4LowEnergyBremsstrahlung::BuildLossTable(const G4ParticleDefinition& ) |
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| 232 | { |
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| 233 | // Build table for energy loss due to soft brems |
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| 234 | // the tables are built for *MATERIALS* binning is taken from LowEnergyLoss |
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| 235 | |
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| 236 | G4double lowKineticEnergy = GetLowerBoundEloss(); |
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| 237 | G4double highKineticEnergy = GetUpperBoundEloss(); |
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| 238 | size_t totBin = GetNbinEloss(); |
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| 239 | |
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| 240 | // create table |
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| 241 | |
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| 242 | if (theLossTable) { |
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| 243 | theLossTable->clearAndDestroy(); |
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| 244 | delete theLossTable; |
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| 245 | } |
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| 246 | const G4ProductionCutsTable* theCoupleTable= |
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| 247 | G4ProductionCutsTable::GetProductionCutsTable(); |
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| 248 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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| 249 | theLossTable = new G4PhysicsTable(numOfCouples); |
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| 250 | |
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| 251 | // Clean up the vector of cuts |
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| 252 | cutForSecondaryPhotons.clear(); |
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| 253 | |
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| 254 | // Loop for materials |
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| 255 | |
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| 256 | for (size_t j=0; j<numOfCouples; j++) { |
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| 257 | |
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| 258 | // create physics vector and fill it |
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| 259 | G4PhysicsLogVector* aVector = new G4PhysicsLogVector(lowKineticEnergy, |
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| 260 | highKineticEnergy, |
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| 261 | totBin); |
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| 262 | |
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| 263 | // get material parameters needed for the energy loss calculation |
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| 264 | const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(j); |
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| 265 | const G4Material* material= couple->GetMaterial(); |
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| 266 | |
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| 267 | // the cut cannot be below lowest limit |
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| 268 | G4double tCut = (*(theCoupleTable->GetEnergyCutsVector(0)))[j]; |
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| 269 | tCut = std::min(highKineticEnergy, tCut); |
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| 270 | cutForSecondaryPhotons.push_back(tCut); |
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| 271 | |
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| 272 | const G4ElementVector* theElementVector = material->GetElementVector(); |
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| 273 | size_t NumberOfElements = material->GetNumberOfElements() ; |
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| 274 | const G4double* theAtomicNumDensityVector = |
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| 275 | material->GetAtomicNumDensityVector(); |
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| 276 | if(verboseLevel > 1) { |
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| 277 | G4cout << "Energy loss for material # " << j |
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| 278 | << " tCut(keV)= " << tCut/keV |
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| 279 | << G4endl; |
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| 280 | } |
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| 281 | |
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| 282 | // now comes the loop for the kinetic energy values |
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| 283 | for (size_t i = 0; i<totBin; i++) { |
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| 284 | |
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| 285 | G4double lowEdgeEnergy = aVector->GetLowEdgeEnergy(i); |
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| 286 | G4double ionloss = 0.; |
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| 287 | |
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| 288 | // loop for elements in the material |
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| 289 | for (size_t iel=0; iel<NumberOfElements; iel++ ) { |
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| 290 | G4int Z = (G4int)((*theElementVector)[iel]->GetZ()); |
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| 291 | G4double e = energySpectrum->AverageEnergy(Z, 0.0, tCut, lowEdgeEnergy); |
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| 292 | G4double cs= crossSectionHandler->FindValue(Z, lowEdgeEnergy); |
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| 293 | ionloss += e * cs * theAtomicNumDensityVector[iel]; |
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| 294 | if(verboseLevel > 1) { |
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| 295 | G4cout << "Z= " << Z |
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| 296 | << "; tCut(keV)= " << tCut/keV |
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| 297 | << "; E(keV)= " << lowEdgeEnergy/keV |
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| 298 | << "; Eav(keV)= " << e/keV |
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| 299 | << "; cs= " << cs |
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| 300 | << "; loss= " << ionloss |
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| 301 | << G4endl; |
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| 302 | } |
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| 303 | } |
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| 304 | aVector->PutValue(i,ionloss); |
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| 305 | } |
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| 306 | theLossTable->insert(aVector); |
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| 307 | } |
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| 308 | } |
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| 309 | |
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| 310 | |
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| 311 | G4VParticleChange* G4LowEnergyBremsstrahlung::PostStepDoIt(const G4Track& track, |
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| 312 | const G4Step& step) |
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| 313 | { |
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| 314 | aParticleChange.Initialize(track); |
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| 315 | |
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| 316 | const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple(); |
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| 317 | G4double kineticEnergy = track.GetKineticEnergy(); |
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| 318 | G4int index = couple->GetIndex(); |
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| 319 | G4double tCut = cutForSecondaryPhotons[index]; |
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| 320 | |
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| 321 | // Control limits |
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| 322 | if(tCut >= kineticEnergy) |
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| 323 | return G4VContinuousDiscreteProcess::PostStepDoIt(track, step); |
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| 324 | |
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| 325 | G4int Z = crossSectionHandler->SelectRandomAtom(couple, kineticEnergy); |
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| 326 | |
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| 327 | G4double tGamma = energySpectrum->SampleEnergy(Z, tCut, kineticEnergy, kineticEnergy); |
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| 328 | G4double totalEnergy = kineticEnergy + electron_mass_c2; |
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| 329 | G4double finalEnergy = kineticEnergy - tGamma; // electron/positron final energy |
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| 330 | G4double theta = 0; |
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| 331 | |
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| 332 | if((kineticEnergy < 1*MeV && kineticEnergy > 1*keV && generatorName == "2bn")){ |
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| 333 | theta = angularDistribution->PolarAngle(kineticEnergy,finalEnergy,Z); |
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| 334 | }else{ |
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| 335 | theta = TsaiAngularDistribution->PolarAngle(kineticEnergy,finalEnergy,Z); |
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| 336 | } |
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| 337 | |
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| 338 | G4double phi = twopi * G4UniformRand(); |
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| 339 | G4double dirZ = std::cos(theta); |
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| 340 | G4double sinTheta = std::sqrt(1. - dirZ*dirZ); |
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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 | |
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| 344 | G4ThreeVector gammaDirection (dirX, dirY, dirZ); |
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| 345 | G4ThreeVector electronDirection = track.GetMomentumDirection(); |
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| 346 | |
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| 347 | // |
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| 348 | // Update the incident particle |
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| 349 | // |
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| 350 | gammaDirection.rotateUz(electronDirection); |
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| 351 | |
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| 352 | // Kinematic problem |
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| 353 | if (finalEnergy < 0.) { |
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| 354 | tGamma += finalEnergy; |
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| 355 | finalEnergy = 0.0; |
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| 356 | } |
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| 357 | |
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| 358 | G4double momentum = std::sqrt((totalEnergy + electron_mass_c2)*kineticEnergy); |
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| 359 | |
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| 360 | G4double finalX = momentum*electronDirection.x() - tGamma*gammaDirection.x(); |
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| 361 | G4double finalY = momentum*electronDirection.y() - tGamma*gammaDirection.y(); |
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| 362 | G4double finalZ = momentum*electronDirection.z() - tGamma*gammaDirection.z(); |
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| 363 | |
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| 364 | aParticleChange.SetNumberOfSecondaries(1); |
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| 365 | G4double norm = 1./std::sqrt(finalX*finalX + finalY*finalY + finalZ*finalZ); |
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| 366 | aParticleChange.ProposeMomentumDirection(finalX*norm, finalY*norm, finalZ*norm); |
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| 367 | aParticleChange.ProposeEnergy( finalEnergy ); |
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| 368 | |
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| 369 | // create G4DynamicParticle object for the gamma |
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| 370 | G4DynamicParticle* aGamma= new G4DynamicParticle (G4Gamma::Gamma(), |
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| 371 | gammaDirection, tGamma); |
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| 372 | aParticleChange.AddSecondary(aGamma); |
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| 373 | |
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| 374 | return G4VContinuousDiscreteProcess::PostStepDoIt(track, step); |
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| 375 | } |
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| 376 | |
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| 377 | |
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| 378 | void G4LowEnergyBremsstrahlung::PrintInfoDefinition() |
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| 379 | { |
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| 380 | G4String comments = "Total cross sections from EEDL database."; |
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| 381 | comments += "\n Gamma energy sampled from a parameterised formula."; |
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| 382 | comments += "\n Implementation of the continuous dE/dx part."; |
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| 383 | comments += "\n At present it can be used for electrons "; |
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| 384 | comments += "in the energy range [250eV,100GeV]."; |
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| 385 | comments += "\n The process must work with G4LowEnergyIonisation."; |
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| 386 | |
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| 387 | G4cout << G4endl << GetProcessName() << ": " << comments << G4endl; |
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| 388 | } |
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| 389 | |
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| 390 | G4bool G4LowEnergyBremsstrahlung::IsApplicable(const G4ParticleDefinition& particle) |
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| 391 | { |
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| 392 | return ( (&particle == G4Electron::Electron()) ); |
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| 393 | } |
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| 394 | |
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| 395 | |
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| 396 | G4double G4LowEnergyBremsstrahlung::GetMeanFreePath(const G4Track& track, |
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| 397 | G4double, |
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| 398 | G4ForceCondition* cond) |
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| 399 | { |
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| 400 | *cond = NotForced; |
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| 401 | G4int index = (track.GetMaterialCutsCouple())->GetIndex(); |
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| 402 | const G4VEMDataSet* data = theMeanFreePath->GetComponent(index); |
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| 403 | G4double meanFreePath = data->FindValue(track.GetKineticEnergy()); |
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| 404 | return meanFreePath; |
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| 405 | } |
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| 406 | |
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| 407 | void G4LowEnergyBremsstrahlung::SetCutForLowEnSecPhotons(G4double cut) |
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| 408 | { |
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| 409 | cutForPhotons = cut; |
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| 410 | } |
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| 411 | |
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| 412 | void G4LowEnergyBremsstrahlung::SetAngularGenerator(G4VBremAngularDistribution* distribution) |
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| 413 | { |
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| 414 | angularDistribution = distribution; |
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| 415 | angularDistribution->PrintGeneratorInformation(); |
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| 416 | } |
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| 417 | |
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| 418 | void G4LowEnergyBremsstrahlung::SetAngularGenerator(const G4String& name) |
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| 419 | { |
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| 420 | if (name == "tsai") |
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| 421 | { |
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| 422 | delete angularDistribution; |
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| 423 | angularDistribution = new G4ModifiedTsai("TsaiGenerator"); |
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| 424 | generatorName = name; |
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| 425 | } |
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| 426 | else if (name == "2bn") |
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| 427 | { |
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| 428 | delete angularDistribution; |
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| 429 | angularDistribution = new G4Generator2BN("2BNGenerator"); |
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| 430 | generatorName = name; |
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| 431 | } |
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| 432 | else if (name == "2bs") |
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| 433 | { |
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| 434 | delete angularDistribution; |
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| 435 | angularDistribution = new G4Generator2BS("2BSGenerator"); |
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| 436 | generatorName = name; |
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| 437 | } |
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| 438 | else |
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| 439 | { |
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| 440 | G4Exception("G4LowEnergyBremsstrahlung::SetAngularGenerator - generator does not exist"); |
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| 441 | } |
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| 442 | |
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| 443 | angularDistribution->PrintGeneratorInformation(); |
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| 444 | } |
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| 445 | |
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