[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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| 26 | // $Id: G4PenelopeCompton.cc,v 1.26 2006/06/29 19:40:41 gunter Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 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 | // 12 Feb 2003 MG Pia const argument in SelectRandomAtomForCompton |
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| 34 | // Migration to "cuts per region" |
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| 35 | // 14 Feb 2003 MG Pia Corrected compilation errors and warnings |
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| 36 | // from SUN |
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| 37 | // Modified some variables to lowercase initial |
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| 38 | // 10 Mar 2003 V.Ivanchenko Remove CutPerMaterial warning |
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| 39 | // 13 Mar 2003 L.Pandola Code "cleaned" |
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| 40 | // 20 Mar 2003 L.Pandola ReadData() changed (performance improved) |
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| 41 | // 26 Mar 2003 L.Pandola Added fluorescence |
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| 42 | // 24 May 2003 MGP Removed memory leak |
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| 43 | // 09 Mar 2004 L.Pandola Bug fixed in the generation of final state |
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| 44 | // (bug report # 585) |
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| 45 | // 17 Mar 2004 L.Pandola Removed unnecessary calls to std::pow(a,b) |
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| 46 | // 18 Mar 2004 L.Pandola Use of std::map (code review) |
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| 47 | // |
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| 48 | // ------------------------------------------------------------------- |
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| 49 | |
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| 50 | #include "G4PenelopeCompton.hh" |
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| 51 | #include "Randomize.hh" |
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| 52 | #include "G4ParticleDefinition.hh" |
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| 53 | #include "G4Track.hh" |
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| 54 | #include "G4Step.hh" |
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| 55 | #include "G4ForceCondition.hh" |
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| 56 | #include "G4Gamma.hh" |
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| 57 | #include "G4Electron.hh" |
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| 58 | #include "G4DynamicParticle.hh" |
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| 59 | #include "G4VParticleChange.hh" |
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| 60 | #include "G4ThreeVector.hh" |
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| 61 | #include "G4EnergyLossTables.hh" |
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| 62 | #include "G4VCrossSectionHandler.hh" |
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| 63 | #include "G4CrossSectionHandler.hh" |
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| 64 | #include "G4VEMDataSet.hh" |
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| 65 | #include "G4EMDataSet.hh" |
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| 66 | #include "G4CompositeEMDataSet.hh" |
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| 67 | #include "G4VDataSetAlgorithm.hh" |
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| 68 | #include "G4LogLogInterpolation.hh" |
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| 69 | #include "G4VRangeTest.hh" |
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| 70 | #include "G4RangeTest.hh" |
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| 71 | #include "G4ProductionCutsTable.hh" |
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| 72 | #include "G4AtomicTransitionManager.hh" |
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| 73 | #include "G4AtomicShell.hh" |
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| 74 | #include "G4AtomicDeexcitation.hh" |
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| 75 | #include "G4PenelopeIntegrator.hh" |
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| 76 | #include "G4MaterialCutsCouple.hh" |
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| 77 | |
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| 78 | |
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| 79 | G4PenelopeCompton::G4PenelopeCompton(const G4String& processName) |
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| 80 | : G4VDiscreteProcess(processName), |
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| 81 | lowEnergyLimit(250*eV), |
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| 82 | highEnergyLimit(100*GeV), |
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| 83 | intrinsicLowEnergyLimit(10*eV), |
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| 84 | intrinsicHighEnergyLimit(100*GeV), |
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| 85 | energyForIntegration(0.0), |
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| 86 | ZForIntegration(1), |
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| 87 | nBins(200), |
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| 88 | cutForLowEnergySecondaryPhotons(250.0*eV) |
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| 89 | { |
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| 90 | if (lowEnergyLimit < intrinsicLowEnergyLimit || |
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| 91 | highEnergyLimit > intrinsicHighEnergyLimit) |
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| 92 | { |
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| 93 | G4Exception("G4PenelopeCompton::G4PenelopeCompton - energy outside intrinsic process validity range"); |
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| 94 | } |
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| 95 | |
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| 96 | meanFreePathTable = 0; |
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| 97 | ionizationEnergy = new std::map<G4int,G4DataVector*>; |
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| 98 | hartreeFunction = new std::map<G4int,G4DataVector*>; |
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| 99 | occupationNumber = new std::map<G4int,G4DataVector*>; |
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| 100 | |
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| 101 | rangeTest = new G4RangeTest; |
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| 102 | |
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| 103 | ReadData(); //Read data from file |
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| 104 | |
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| 105 | if (verboseLevel > 0) |
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| 106 | { |
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| 107 | G4cout << GetProcessName() << " is created " << G4endl |
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| 108 | << "Energy range: " |
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| 109 | << lowEnergyLimit / keV << " keV - " |
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| 110 | << highEnergyLimit / GeV << " GeV" |
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| 111 | << G4endl; |
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| 112 | } |
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| 113 | } |
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| 114 | |
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| 115 | G4PenelopeCompton::~G4PenelopeCompton() |
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| 116 | { |
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| 117 | delete meanFreePathTable; |
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| 118 | delete rangeTest; |
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| 119 | |
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| 120 | for (size_t i1=0;i1<matCrossSections->size();i1++) |
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| 121 | { |
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| 122 | delete (*matCrossSections)[i1]; |
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| 123 | } |
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| 124 | |
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| 125 | delete matCrossSections; |
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| 126 | |
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| 127 | for (G4int Z=1;Z<100;Z++) |
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| 128 | { |
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| 129 | if (ionizationEnergy->count(Z)) delete (ionizationEnergy->find(Z)->second); |
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| 130 | if (hartreeFunction->count(Z)) delete (hartreeFunction->find(Z)->second); |
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| 131 | if (occupationNumber->count(Z)) delete (occupationNumber->find(Z)->second); |
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| 132 | } |
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| 133 | delete ionizationEnergy; |
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| 134 | delete hartreeFunction; |
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| 135 | delete occupationNumber; |
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| 136 | } |
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| 137 | |
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| 138 | void G4PenelopeCompton::BuildPhysicsTable(const G4ParticleDefinition& ) |
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| 139 | { |
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| 140 | G4DataVector energyVector; |
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| 141 | G4double dBin = std::log10(highEnergyLimit/lowEnergyLimit)/nBins; |
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| 142 | G4int i; |
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| 143 | for (i=0;i<nBins;i++) |
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| 144 | { |
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| 145 | energyVector.push_back(std::pow(10.,std::log10(lowEnergyLimit)+i*dBin)); |
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| 146 | } |
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| 147 | |
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| 148 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
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| 149 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
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| 150 | G4VDataSetAlgorithm* algo = new G4LogLogInterpolation(); |
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| 151 | |
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| 152 | size_t nOfBins = energyVector.size(); |
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| 153 | size_t bin=0; |
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| 154 | |
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| 155 | G4DataVector* energies; |
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| 156 | G4DataVector* data; |
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| 157 | |
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| 158 | matCrossSections = new std::vector<G4VEMDataSet*>; |
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| 159 | |
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| 160 | |
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| 161 | G4int m; |
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| 162 | for (m=0; m<nMaterials; m++) |
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| 163 | { |
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| 164 | const G4Material* material= (*materialTable)[m]; |
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| 165 | G4int nElements = material->GetNumberOfElements(); |
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| 166 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 167 | const G4double* nAtomsPerVolume = material->GetAtomicNumDensityVector(); |
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| 168 | |
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| 169 | G4VEMDataSet* setForMat = new G4CompositeEMDataSet(algo,1.,1.); |
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| 170 | |
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| 171 | for (i=0; i<nElements; i++) { |
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| 172 | |
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| 173 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
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| 174 | G4double density = nAtomsPerVolume[i]; |
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| 175 | G4double cross=0.0; |
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| 176 | energies = new G4DataVector; |
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| 177 | data = new G4DataVector; |
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| 178 | |
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| 179 | |
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| 180 | for (bin=0; bin<nOfBins; bin++) |
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| 181 | { |
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| 182 | G4double e = energyVector[bin]; |
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| 183 | energies->push_back(e); |
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| 184 | cross = density * CrossSection(e,Z); |
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| 185 | data->push_back(cross); |
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| 186 | } |
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| 187 | |
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| 188 | G4VEMDataSet* elSet = new G4EMDataSet(i,energies,data,algo,1.,1.); |
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| 189 | setForMat->AddComponent(elSet); |
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| 190 | } |
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| 191 | |
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| 192 | matCrossSections->push_back(setForMat); |
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| 193 | } |
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| 194 | |
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| 195 | |
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| 196 | //Build the mean free path table! |
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| 197 | G4double matCS = 0.0; |
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| 198 | G4VEMDataSet* matCrossSet = new G4CompositeEMDataSet(algo,1.,1.); |
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| 199 | G4VEMDataSet* materialSet = new G4CompositeEMDataSet(algo,1.,1.); |
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| 200 | |
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| 201 | |
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| 202 | for (m=0; m<nMaterials; m++) |
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| 203 | { |
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| 204 | energies = new G4DataVector; |
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| 205 | data = new G4DataVector; |
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| 206 | const G4Material* material= (*materialTable)[m]; |
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| 207 | material= (*materialTable)[m]; |
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| 208 | for (bin=0; bin<nOfBins; bin++) |
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| 209 | { |
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| 210 | G4double energy = energyVector[bin]; |
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| 211 | energies->push_back(energy); |
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| 212 | matCrossSet = (*matCrossSections)[m]; |
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| 213 | matCS = 0.0; |
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| 214 | G4int nElm = matCrossSet->NumberOfComponents(); |
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| 215 | for(G4int j=0; j<nElm; j++) { |
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| 216 | matCS += matCrossSet->GetComponent(j)->FindValue(energy); |
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| 217 | } |
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| 218 | if (matCS > 0.) |
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| 219 | { |
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| 220 | data->push_back(1./matCS); |
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| 221 | } |
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| 222 | else |
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| 223 | { |
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| 224 | data->push_back(DBL_MAX); |
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| 225 | } |
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| 226 | } |
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| 227 | G4VEMDataSet* dataSet = new G4EMDataSet(m,energies,data,algo,1.,1.); |
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| 228 | materialSet->AddComponent(dataSet); |
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| 229 | } |
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| 230 | meanFreePathTable = materialSet; |
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| 231 | } |
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| 232 | |
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| 233 | G4VParticleChange* G4PenelopeCompton::PostStepDoIt(const G4Track& aTrack, |
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| 234 | const G4Step& aStep) |
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| 235 | { |
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| 236 | //Penelope model |
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| 237 | |
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| 238 | aParticleChange.Initialize(aTrack); |
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| 239 | |
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| 240 | // Dynamic particle quantities |
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| 241 | const G4DynamicParticle* incidentPhoton = aTrack.GetDynamicParticle(); |
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| 242 | G4double photonEnergy0 = incidentPhoton->GetKineticEnergy(); |
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| 243 | |
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| 244 | if (photonEnergy0 <= lowEnergyLimit) |
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| 245 | { |
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| 246 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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| 247 | aParticleChange.ProposeEnergy(0.); |
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| 248 | aParticleChange.ProposeLocalEnergyDeposit(photonEnergy0); |
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| 249 | return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep); |
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| 250 | } |
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| 251 | |
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| 252 | G4ParticleMomentum photonDirection0 = incidentPhoton->GetMomentumDirection(); |
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| 253 | |
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| 254 | const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple(); |
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| 255 | const G4Material* material = couple->GetMaterial(); |
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| 256 | G4int Z = SelectRandomAtomForCompton(material,photonEnergy0); |
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| 257 | const G4int nmax = 64; |
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| 258 | G4double rn[nmax],pac[nmax]; |
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| 259 | |
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| 260 | G4double ki,ki1,ki2,ki3,taumin,a1,a2; |
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| 261 | G4double tau,TST; |
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| 262 | G4double S=0.0; |
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| 263 | G4double epsilon,cosTheta; |
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| 264 | G4double harFunc = 0.0; |
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| 265 | G4int occupNb= 0; |
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| 266 | G4double ionEnergy=0.0; |
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| 267 | G4int nosc = occupationNumber->find(Z)->second->size(); |
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| 268 | G4int iosc = nosc; |
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| 269 | ki = photonEnergy0/electron_mass_c2; |
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| 270 | ki2 = 2*ki+1.0; |
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| 271 | ki3 = ki*ki; |
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| 272 | ki1 = ki3-ki2-1.0; |
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| 273 | taumin = 1.0/ki2; |
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| 274 | a1 = std::log(ki2); |
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| 275 | a2 = a1+2.0*ki*(1.0+ki)/(ki2*ki2); |
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| 276 | if (photonEnergy0 > 5*MeV) |
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| 277 | { |
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| 278 | do{ |
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| 279 | do{ |
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| 280 | if ((a2*G4UniformRand()) < a1) |
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| 281 | { |
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| 282 | tau = std::pow(taumin,G4UniformRand()); |
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| 283 | } |
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| 284 | else |
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| 285 | { |
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| 286 | tau = std::sqrt(1.0+G4UniformRand()*(taumin*taumin-1.0)); |
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| 287 | } |
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| 288 | //rejection function |
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| 289 | TST = (1+tau*(ki1+tau*(ki2+tau*ki3)))/(ki3*tau*(1.0+tau*tau)); |
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| 290 | }while (G4UniformRand()> TST); |
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| 291 | epsilon=tau; |
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| 292 | cosTheta = 1.0 - (1.0-tau)/(ki*tau); |
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| 293 | //Target shell electrons |
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| 294 | TST = Z*G4UniformRand(); |
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| 295 | iosc = nosc; |
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| 296 | S=0.0; |
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| 297 | for (G4int j=0;j<nosc;j++) |
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| 298 | { |
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| 299 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[j]; |
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| 300 | S = S + occupNb; |
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| 301 | if (S > TST) iosc = j; |
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| 302 | if (S > TST) break; |
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| 303 | } |
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| 304 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[iosc]; |
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| 305 | }while((epsilon*photonEnergy0-photonEnergy0+ionEnergy) >0); |
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| 306 | } |
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| 307 | |
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| 308 | else //photonEnergy0<5 MeV |
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| 309 | { |
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| 310 | //Incoherent scattering function for theta=PI |
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| 311 | G4double s0=0.0; |
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| 312 | G4double pzomc=0.0,rni=0.0; |
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| 313 | G4double aux=0.0; |
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| 314 | for (G4int i=0;i<nosc;i++){ |
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| 315 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
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| 316 | if (photonEnergy0 > ionEnergy) |
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| 317 | { |
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| 318 | G4double aux = photonEnergy0*(photonEnergy0-ionEnergy)*2.0; |
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| 319 | harFunc = (*(hartreeFunction->find(Z)->second))[i]/fine_structure_const; |
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| 320 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
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| 321 | pzomc = harFunc*(aux-electron_mass_c2*ionEnergy)/ |
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| 322 | (electron_mass_c2*std::sqrt(2.0*aux+ionEnergy*ionEnergy)); |
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| 323 | if (pzomc > 0) |
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| 324 | { |
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| 325 | rni = 1.0-0.5*std::exp(0.5-(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)); |
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| 326 | } |
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| 327 | else |
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| 328 | { |
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| 329 | rni = 0.5*std::exp(0.5-(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)); |
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| 330 | } |
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| 331 | s0 = s0 + occupNb*rni; |
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| 332 | } |
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| 333 | } |
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| 334 | |
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| 335 | //Sampling tau |
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| 336 | G4double cdt1; |
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| 337 | do |
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| 338 | { |
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| 339 | if ((G4UniformRand()*a2) < a1) |
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| 340 | { |
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| 341 | tau = std::pow(taumin,G4UniformRand()); |
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| 342 | } |
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| 343 | else |
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| 344 | { |
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| 345 | tau = std::sqrt(1.0+G4UniformRand()*(taumin*taumin-1.0)); |
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| 346 | } |
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| 347 | cdt1 = (1.0-tau)/(ki*tau); |
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| 348 | S=0.0; |
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| 349 | //Incoherent scattering function |
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| 350 | for (G4int i=0;i<nosc;i++){ |
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| 351 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
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| 352 | if (photonEnergy0 > ionEnergy) //sum only on excitable levels |
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| 353 | { |
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| 354 | aux = photonEnergy0*(photonEnergy0-ionEnergy)*cdt1; |
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| 355 | harFunc = (*(hartreeFunction->find(Z)->second))[i]/fine_structure_const; |
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| 356 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
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| 357 | pzomc = harFunc*(aux-electron_mass_c2*ionEnergy)/ |
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| 358 | (electron_mass_c2*std::sqrt(2.0*aux+ionEnergy*ionEnergy)); |
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| 359 | if (pzomc > 0) |
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| 360 | { |
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| 361 | rn[i] = 1.0-0.5*std::exp(0.5-(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)); |
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| 362 | } |
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| 363 | else |
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| 364 | { |
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| 365 | rn[i] = 0.5*std::exp(0.5-(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)); |
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| 366 | } |
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| 367 | S = S + occupNb*rn[i]; |
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| 368 | pac[i] = S; |
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| 369 | } |
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| 370 | else |
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| 371 | { |
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| 372 | pac[i] = S-(1e-06); |
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| 373 | } |
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| 374 | } |
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| 375 | //Rejection function |
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| 376 | TST = S*(1.0+tau*(ki1+tau*(ki2+tau*ki3)))/(ki3*tau*(1.0+tau*tau)); |
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| 377 | }while ((G4UniformRand()*s0) > TST); |
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| 378 | |
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| 379 | //Target electron shell |
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| 380 | cosTheta = 1.0 - cdt1; |
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| 381 | G4double fpzmax=0.0,fpz=0.0; |
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| 382 | G4double A=0.0; |
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| 383 | do |
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| 384 | { |
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| 385 | do |
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| 386 | { |
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| 387 | TST =S*G4UniformRand(); |
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| 388 | iosc=nosc; |
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| 389 | for (G4int i=0;i<nosc;i++){ |
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| 390 | if (pac[i]>TST) iosc = i; |
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| 391 | if (pac[i]>TST) break; |
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| 392 | } |
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| 393 | A = G4UniformRand()*rn[iosc]; |
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| 394 | harFunc = (*(hartreeFunction->find(Z)->second))[iosc]/fine_structure_const; |
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| 395 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[iosc]; |
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| 396 | if (A < 0.5) { |
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| 397 | pzomc = (std::sqrt(0.5)-std::sqrt(0.5-std::log(2.0*A)))/ |
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| 398 | (std::sqrt(2.0)*harFunc); |
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| 399 | } |
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| 400 | else |
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| 401 | { |
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| 402 | pzomc = (std::sqrt(0.5-std::log(2.0-2.0*A))-std::sqrt(0.5))/ |
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| 403 | (std::sqrt(2.0)*harFunc); |
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| 404 | } |
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| 405 | } while (pzomc < -1); |
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| 406 | // F(EP) rejection |
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| 407 | G4double XQC = 1.0+tau*(tau-2.0*cosTheta); |
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| 408 | G4double AF = std::sqrt(XQC)*(1.0+tau*(tau-cosTheta)/XQC); |
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| 409 | if (AF > 0) { |
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| 410 | fpzmax = 1.0+AF*0.2; |
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| 411 | } |
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| 412 | else |
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| 413 | { |
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| 414 | fpzmax = 1.0-AF*0.2; |
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| 415 | } |
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| 416 | fpz = 1.0+AF*std::max(std::min(pzomc,0.2),-0.2); |
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| 417 | }while ((fpzmax*G4UniformRand())>fpz); |
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| 418 | |
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| 419 | //Energy of the scattered photon |
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| 420 | G4double T = pzomc*pzomc; |
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| 421 | G4double b1 = 1.0-T*tau*tau; |
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| 422 | G4double b2 = 1.0-T*tau*cosTheta; |
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| 423 | if (pzomc > 0.0) |
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| 424 | { |
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| 425 | epsilon = (tau/b1)*(b2+std::sqrt(std::abs(b2*b2-b1*(1.0-T)))); |
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| 426 | } |
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| 427 | else |
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| 428 | { |
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| 429 | epsilon = (tau/b1)*(b2-std::sqrt(std::abs(b2*b2-b1*(1.0-T)))); |
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| 430 | } |
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| 431 | } |
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| 432 | |
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| 433 | |
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| 434 | G4double sinTheta = std::sqrt(1-cosTheta*cosTheta); |
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| 435 | G4double phi = twopi * G4UniformRand() ; |
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| 436 | G4double dirx = sinTheta * std::cos(phi); |
---|
| 437 | G4double diry = sinTheta * std::sin(phi); |
---|
| 438 | G4double dirz = cosTheta ; |
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| 439 | |
---|
| 440 | // Update G4VParticleChange for the scattered photon |
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| 441 | |
---|
| 442 | G4ThreeVector photonDirection1(dirx,diry,dirz); |
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| 443 | photonDirection1.rotateUz(photonDirection0); |
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| 444 | aParticleChange.ProposeMomentumDirection(photonDirection1) ; |
---|
| 445 | G4double photonEnergy1 = epsilon * photonEnergy0; |
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| 446 | |
---|
| 447 | if (photonEnergy1 > 0.) |
---|
| 448 | { |
---|
| 449 | aParticleChange.ProposeEnergy(photonEnergy1) ; |
---|
| 450 | } |
---|
| 451 | else |
---|
| 452 | { |
---|
| 453 | aParticleChange.ProposeEnergy(0.) ; |
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| 454 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
| 455 | } |
---|
| 456 | |
---|
| 457 | |
---|
| 458 | // Kinematics of the scattered electron |
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| 459 | |
---|
| 460 | |
---|
| 461 | G4double diffEnergy = photonEnergy0*(1-epsilon); |
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| 462 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[iosc]; |
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| 463 | //G4double eKineticEnergy = diffEnergy - ionEnergy; |
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| 464 | G4double Q2 = photonEnergy0*photonEnergy0+photonEnergy1*(photonEnergy1-2.0*photonEnergy0*cosTheta); |
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| 465 | G4double cosThetaE; //scattering angle for the electron |
---|
| 466 | if (Q2 > 1.0e-12) |
---|
| 467 | { |
---|
| 468 | cosThetaE = (photonEnergy0-photonEnergy1*cosTheta)/std::sqrt(Q2); |
---|
| 469 | } |
---|
| 470 | else |
---|
| 471 | { |
---|
| 472 | cosThetaE = 1.0; |
---|
| 473 | } |
---|
| 474 | G4double sinThetaE = std::sqrt(1-cosThetaE*cosThetaE); |
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| 475 | |
---|
| 476 | |
---|
| 477 | |
---|
| 478 | const G4AtomicTransitionManager* transitionManager = G4AtomicTransitionManager::Instance(); |
---|
| 479 | const G4AtomicShell* shell = transitionManager->Shell(Z,iosc); |
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| 480 | G4double bindingEnergy = shell->BindingEnergy(); |
---|
| 481 | G4int shellId = shell->ShellId(); |
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| 482 | //G4cout << bindingEnergy/keV << " " << ionEnergy/keV << " keV" << G4endl; |
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| 483 | ionEnergy = std::max(bindingEnergy,ionEnergy); //protection against energy non-conservation |
---|
| 484 | G4double eKineticEnergy = diffEnergy - ionEnergy; |
---|
| 485 | |
---|
| 486 | size_t nTotPhotons=0; |
---|
| 487 | G4int nPhotons=0; |
---|
| 488 | |
---|
| 489 | const G4ProductionCutsTable* theCoupleTable= |
---|
| 490 | G4ProductionCutsTable::GetProductionCutsTable(); |
---|
| 491 | size_t indx = couple->GetIndex(); |
---|
| 492 | G4double cutg = (*(theCoupleTable->GetEnergyCutsVector(0)))[indx]; |
---|
| 493 | cutg = std::min(cutForLowEnergySecondaryPhotons,cutg); |
---|
| 494 | |
---|
| 495 | G4double cute = (*(theCoupleTable->GetEnergyCutsVector(1)))[indx]; |
---|
| 496 | cute = std::min(cutForLowEnergySecondaryPhotons,cute); |
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| 497 | |
---|
| 498 | std::vector<G4DynamicParticle*>* photonVector=0; |
---|
| 499 | G4DynamicParticle* aPhoton; |
---|
| 500 | G4AtomicDeexcitation deexcitationManager; |
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| 501 | |
---|
| 502 | if (Z>5 && (ionEnergy > cutg || ionEnergy > cute)) |
---|
| 503 | { |
---|
| 504 | photonVector = deexcitationManager.GenerateParticles(Z,shellId); |
---|
| 505 | nTotPhotons = photonVector->size(); |
---|
| 506 | for (size_t k=0;k<nTotPhotons;k++){ |
---|
| 507 | aPhoton = (*photonVector)[k]; |
---|
| 508 | if (aPhoton) |
---|
| 509 | { |
---|
| 510 | G4double itsCut = cutg; |
---|
| 511 | if (aPhoton->GetDefinition() == G4Electron::Electron()) itsCut = cute; |
---|
| 512 | G4double itsEnergy = aPhoton->GetKineticEnergy(); |
---|
| 513 | if (itsEnergy > itsCut && itsEnergy <= ionEnergy) |
---|
| 514 | { |
---|
| 515 | nPhotons++; |
---|
| 516 | ionEnergy -= itsEnergy; |
---|
| 517 | } |
---|
| 518 | else |
---|
| 519 | { |
---|
| 520 | delete aPhoton; |
---|
| 521 | (*photonVector)[k]=0; |
---|
| 522 | } |
---|
| 523 | } |
---|
| 524 | } |
---|
| 525 | } |
---|
| 526 | G4double energyDeposit =ionEnergy; //il deposito locale e' quello che rimane |
---|
| 527 | G4int nbOfSecondaries=nPhotons; |
---|
| 528 | |
---|
| 529 | // Generate the electron only if with large enough range w.r.t. cuts and safety |
---|
| 530 | G4double safety = aStep.GetPostStepPoint()->GetSafety(); |
---|
| 531 | G4DynamicParticle* electron = 0; |
---|
| 532 | if (rangeTest->Escape(G4Electron::Electron(),couple,eKineticEnergy,safety)) |
---|
| 533 | { |
---|
| 534 | G4double xEl = sinThetaE * std::cos(phi+pi); |
---|
| 535 | G4double yEl = sinThetaE * std::sin(phi+pi); |
---|
| 536 | G4double zEl = cosThetaE; |
---|
| 537 | G4ThreeVector eDirection(xEl,yEl,zEl); //electron direction |
---|
| 538 | eDirection.rotateUz(photonDirection0); |
---|
| 539 | electron = new G4DynamicParticle (G4Electron::Electron(), |
---|
| 540 | eDirection,eKineticEnergy) ; |
---|
| 541 | nbOfSecondaries++; |
---|
| 542 | } |
---|
| 543 | else |
---|
| 544 | { |
---|
| 545 | |
---|
| 546 | energyDeposit += eKineticEnergy; |
---|
| 547 | } |
---|
| 548 | |
---|
| 549 | aParticleChange.SetNumberOfSecondaries(nbOfSecondaries); |
---|
| 550 | if (electron) aParticleChange.AddSecondary(electron); |
---|
| 551 | for (size_t ll=0;ll<nTotPhotons;ll++) |
---|
| 552 | { |
---|
| 553 | aPhoton = (*photonVector)[ll]; |
---|
| 554 | if (aPhoton) aParticleChange.AddSecondary(aPhoton); |
---|
| 555 | } |
---|
| 556 | delete photonVector; |
---|
| 557 | if (energyDeposit < 0) |
---|
| 558 | { |
---|
| 559 | G4cout << "WARNING-" |
---|
| 560 | << "G4PenelopeCompton::PostStepDoIt - Negative energy deposit" |
---|
| 561 | << G4endl; |
---|
| 562 | energyDeposit=0; |
---|
| 563 | } |
---|
| 564 | aParticleChange.ProposeLocalEnergyDeposit(energyDeposit); |
---|
| 565 | |
---|
| 566 | |
---|
| 567 | return G4VDiscreteProcess::PostStepDoIt( aTrack, aStep); |
---|
| 568 | } |
---|
| 569 | |
---|
| 570 | G4bool G4PenelopeCompton::IsApplicable(const G4ParticleDefinition& particle) |
---|
| 571 | { |
---|
| 572 | return ( &particle == G4Gamma::Gamma() ); |
---|
| 573 | } |
---|
| 574 | |
---|
| 575 | G4double G4PenelopeCompton::GetMeanFreePath(const G4Track& track, |
---|
| 576 | G4double, // previousStepSize |
---|
| 577 | G4ForceCondition*) |
---|
| 578 | { |
---|
| 579 | const G4DynamicParticle* photon = track.GetDynamicParticle(); |
---|
| 580 | G4double energy = photon->GetKineticEnergy(); |
---|
| 581 | G4Material* material = track.GetMaterial(); |
---|
| 582 | size_t materialIndex = material->GetIndex(); |
---|
| 583 | |
---|
| 584 | G4double meanFreePath; |
---|
| 585 | if (energy > highEnergyLimit) meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex); |
---|
| 586 | else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX; |
---|
| 587 | else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex); |
---|
| 588 | return meanFreePath; |
---|
| 589 | } |
---|
| 590 | |
---|
| 591 | |
---|
| 592 | void G4PenelopeCompton::ReadData() |
---|
| 593 | { |
---|
| 594 | char* path = getenv("G4LEDATA"); |
---|
| 595 | if (!path) |
---|
| 596 | { |
---|
| 597 | G4String excep = "G4PenelopeCompton - G4LEDATA environment variable not set!"; |
---|
| 598 | G4Exception(excep); |
---|
| 599 | } |
---|
| 600 | G4String pathString(path); |
---|
| 601 | G4String pathFile = pathString + "/penelope/compton-pen.dat"; |
---|
| 602 | std::ifstream file(pathFile); |
---|
| 603 | std::filebuf* lsdp = file.rdbuf(); |
---|
| 604 | |
---|
| 605 | if (!(lsdp->is_open())) |
---|
| 606 | { |
---|
| 607 | G4String excep = "G4PenelopeCompton - data file " + pathFile + " not found!"; |
---|
| 608 | G4Exception(excep); |
---|
| 609 | } |
---|
| 610 | |
---|
| 611 | G4int k1,test,test1; |
---|
| 612 | G4double a1,a2; |
---|
| 613 | G4int Z=1,nLevels=0; |
---|
| 614 | G4DataVector* f; |
---|
| 615 | G4DataVector* u; |
---|
| 616 | G4DataVector* j; |
---|
| 617 | |
---|
| 618 | do{ |
---|
| 619 | f = new G4DataVector; |
---|
| 620 | u = new G4DataVector; |
---|
| 621 | j = new G4DataVector; |
---|
| 622 | file >> Z >> nLevels; |
---|
| 623 | for (G4int h=0;h<nLevels;h++){ |
---|
| 624 | file >> k1 >> a1 >> a2; |
---|
| 625 | f->push_back((G4double) k1); |
---|
| 626 | u->push_back(a1); |
---|
| 627 | j->push_back(a2); |
---|
| 628 | } |
---|
| 629 | ionizationEnergy->insert(std::make_pair(Z,u)); |
---|
| 630 | hartreeFunction->insert(std::make_pair(Z,j)); |
---|
| 631 | occupationNumber->insert(std::make_pair(Z,f)); |
---|
| 632 | file >> test >> test1; //-1 -1 close the data for each Z |
---|
| 633 | if (test > 0) { |
---|
| 634 | G4String excep = "G4PenelopeCompton - data file corrupted!"; |
---|
| 635 | G4Exception(excep); |
---|
| 636 | } |
---|
| 637 | }while (test != -2); //the very last Z is closed with -2 instead of -1 |
---|
| 638 | } |
---|
| 639 | |
---|
| 640 | G4double G4PenelopeCompton::CrossSection(G4double energy,G4int Z) |
---|
| 641 | { |
---|
| 642 | G4double cs=0.0; |
---|
| 643 | energyForIntegration=energy; |
---|
| 644 | ZForIntegration = Z; |
---|
| 645 | if (energy< 5*MeV) |
---|
| 646 | { |
---|
| 647 | G4PenelopeIntegrator<G4PenelopeCompton,G4double (G4PenelopeCompton::*)(G4double)> theIntegrator; |
---|
| 648 | cs = theIntegrator.Calculate(this,&G4PenelopeCompton::DifferentialCrossSection,-1.0,1.0,1e-05); |
---|
| 649 | } |
---|
| 650 | else |
---|
| 651 | { |
---|
| 652 | G4double ki=energy/electron_mass_c2; |
---|
| 653 | G4double ki3=ki*ki; |
---|
| 654 | G4double ki2=1.0+2*ki; |
---|
| 655 | G4double ki1=ki3-ki2-1.0; |
---|
| 656 | G4double t0=1.0/(ki2); |
---|
| 657 | G4double csl = 0.5*ki3*t0*t0+ki2*t0+ki1*std::log(t0)-(1.0/t0); |
---|
| 658 | G4int nosc = occupationNumber->find(Z)->second->size(); |
---|
| 659 | for (G4int i=0;i<nosc;i++) |
---|
| 660 | { |
---|
| 661 | G4double ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
---|
| 662 | G4double tau=(energy-ionEnergy)/energy; |
---|
| 663 | if (tau > t0) |
---|
| 664 | { |
---|
| 665 | G4double csu = 0.5*ki3*tau*tau+ki2*tau+ki1*std::log(tau)-(1.0/tau); |
---|
| 666 | G4int f = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
---|
| 667 | cs = cs + f*(csu-csl); |
---|
| 668 | } |
---|
| 669 | } |
---|
| 670 | cs=pi*classic_electr_radius*classic_electr_radius*cs/(ki*ki3); |
---|
| 671 | } |
---|
| 672 | return cs; |
---|
| 673 | } |
---|
| 674 | |
---|
| 675 | |
---|
| 676 | G4double G4PenelopeCompton::DifferentialCrossSection(G4double cosTheta) |
---|
| 677 | { |
---|
| 678 | const G4double k2 = std::sqrt(2.0); |
---|
| 679 | const G4double k1 = std::sqrt(0.5); |
---|
| 680 | const G4double k12 = 0.5; |
---|
| 681 | G4double cdt1 = 1.0-cosTheta; |
---|
| 682 | G4double energy = energyForIntegration; |
---|
| 683 | G4int Z = ZForIntegration; |
---|
| 684 | G4double ionEnergy=0.0,Pzimax=0.0,XKN=0.0; |
---|
| 685 | G4double diffCS=0.0; |
---|
| 686 | G4double x=0.0,siap=0.0; |
---|
| 687 | G4double harFunc=0.0; |
---|
| 688 | G4int occupNb; |
---|
| 689 | //energy of Compton line; |
---|
| 690 | G4double EOEC = 1.0+(energy/electron_mass_c2)*cdt1; |
---|
| 691 | G4double ECOE = 1.0/EOEC; |
---|
| 692 | //Incoherent scattering function (analytical profile) |
---|
| 693 | G4double sia = 0.0; |
---|
| 694 | G4int nosc = occupationNumber->find(Z)->second->size(); |
---|
| 695 | for (G4int i=0;i<nosc;i++){ |
---|
| 696 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
---|
| 697 | //Sum only of those shells for which E>Eion |
---|
| 698 | if (energy > ionEnergy) |
---|
| 699 | { |
---|
| 700 | G4double aux = energy * (energy-ionEnergy)*cdt1; |
---|
| 701 | Pzimax = (aux - electron_mass_c2*ionEnergy)/(electron_mass_c2*std::sqrt(2*aux+ionEnergy*ionEnergy)); |
---|
| 702 | harFunc = (*(hartreeFunction->find(Z)->second))[i]/fine_structure_const; |
---|
| 703 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
---|
| 704 | x = harFunc*Pzimax; |
---|
| 705 | if (x > 0) |
---|
| 706 | { |
---|
| 707 | siap = 1.0-0.5*std::exp(k12-(k1+k2*x)*(k1+k2*x)); |
---|
| 708 | } |
---|
| 709 | else |
---|
| 710 | { |
---|
| 711 | siap = 0.5*std::exp(k12-(k1-k2*x)*(k1-k2*x)); |
---|
| 712 | } |
---|
| 713 | sia = sia + occupNb*siap; //sum of all contributions; |
---|
| 714 | } |
---|
| 715 | } |
---|
| 716 | XKN = EOEC+ECOE-1+cosTheta*cosTheta; |
---|
| 717 | diffCS = pi*classic_electr_radius*classic_electr_radius*ECOE*ECOE*XKN*sia; |
---|
| 718 | return diffCS; |
---|
| 719 | } |
---|
| 720 | |
---|
| 721 | G4int G4PenelopeCompton::SelectRandomAtomForCompton(const G4Material* material,G4double energy) const |
---|
| 722 | { |
---|
| 723 | G4int nElements = material->GetNumberOfElements(); |
---|
| 724 | //Special case: the material consists of one element |
---|
| 725 | if (nElements == 1) |
---|
| 726 | { |
---|
| 727 | G4int Z = (G4int) material->GetZ(); |
---|
| 728 | return Z; |
---|
| 729 | } |
---|
| 730 | |
---|
| 731 | //Composite material |
---|
| 732 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
| 733 | size_t materialIndex = material->GetIndex(); |
---|
| 734 | |
---|
| 735 | G4VEMDataSet* materialSet = (*matCrossSections)[materialIndex]; |
---|
| 736 | G4double materialCrossSection0 = 0.0; |
---|
| 737 | G4DataVector cross; |
---|
| 738 | cross.clear(); |
---|
| 739 | G4int i; |
---|
| 740 | for (i=0;i<nElements;i++) |
---|
| 741 | { |
---|
| 742 | G4double cr = (materialSet->GetComponent(i))->FindValue(energy); |
---|
| 743 | materialCrossSection0 += cr; |
---|
| 744 | cross.push_back(materialCrossSection0); //cumulative cross section |
---|
| 745 | } |
---|
| 746 | |
---|
| 747 | G4double random = G4UniformRand()*materialCrossSection0; |
---|
| 748 | for (i=0;i<nElements;i++) |
---|
| 749 | { |
---|
| 750 | if (random <= cross[i]) return (G4int) (*elementVector)[i]->GetZ(); |
---|
| 751 | } |
---|
| 752 | //It should never get here |
---|
| 753 | return 0; |
---|
| 754 | } |
---|
| 755 | |
---|