[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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[1315] | 26 | // $Id: G4PAIModel.cc,v 1.52 2010/06/03 07:28:39 grichine Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-04-beta-cand-01 $ |
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[1055] | 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class |
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[819] | 32 | // File name: G4PAIModel.cc |
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| 33 | // |
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[1315] | 34 | // Author: Vladimir.Grichine@cern.ch on base of Vladimir Ivanchenko model interface |
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[819] | 35 | // |
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| 36 | // Creation date: 05.10.2003 |
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| 37 | // |
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| 38 | // Modifications: |
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| 39 | // |
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| 40 | // 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary |
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| 41 | // 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection, SampleSecondary |
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| 42 | // 08.04.05 Major optimisation of internal interfaces (V.Ivantchenko) |
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[1196] | 43 | // 26.07.09 Fixed logic to work with several materials (V.Ivantchenko) |
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[819] | 44 | // |
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| 45 | |
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| 46 | #include "G4Region.hh" |
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| 47 | #include "G4PhysicsLogVector.hh" |
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| 48 | #include "G4PhysicsFreeVector.hh" |
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| 49 | #include "G4PhysicsTable.hh" |
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| 50 | #include "G4ProductionCutsTable.hh" |
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| 51 | #include "G4MaterialCutsCouple.hh" |
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| 52 | #include "G4MaterialTable.hh" |
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| 53 | #include "G4SandiaTable.hh" |
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| 54 | #include "G4OrderedTable.hh" |
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| 55 | |
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| 56 | #include "G4PAIModel.hh" |
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| 57 | #include "Randomize.hh" |
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| 58 | #include "G4Electron.hh" |
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| 59 | #include "G4Positron.hh" |
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| 60 | #include "G4Poisson.hh" |
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| 61 | #include "G4Step.hh" |
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| 62 | #include "G4Material.hh" |
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| 63 | #include "G4DynamicParticle.hh" |
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| 64 | #include "G4ParticleDefinition.hh" |
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| 65 | #include "G4ParticleChangeForLoss.hh" |
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| 66 | |
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| 67 | //////////////////////////////////////////////////////////////////////// |
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| 68 | |
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| 69 | using namespace std; |
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| 70 | |
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| 71 | G4PAIModel::G4PAIModel(const G4ParticleDefinition* p, const G4String& nam) |
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| 72 | : G4VEmModel(nam),G4VEmFluctuationModel(nam), |
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| 73 | fVerbose(0), |
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| 74 | fLowestGamma(1.005), |
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| 75 | fHighestGamma(10000.), |
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| 76 | fTotBin(200), |
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| 77 | fMeanNumber(20), |
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| 78 | fParticle(0), |
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| 79 | fHighKinEnergy(100.*TeV), |
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| 80 | fTwoln10(2.0*log(10.0)), |
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| 81 | fBg2lim(0.0169), |
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| 82 | fTaulim(8.4146e-3) |
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| 83 | { |
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| 84 | if(p) SetParticle(p); |
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| 85 | |
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| 86 | fElectron = G4Electron::Electron(); |
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| 87 | fPositron = G4Positron::Positron(); |
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| 88 | |
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| 89 | fPAItransferTable = 0; |
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| 90 | fPAIdEdxTable = 0; |
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| 91 | fSandiaPhotoAbsCof = 0; |
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| 92 | fdEdxVector = 0; |
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| 93 | fLambdaVector = 0; |
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| 94 | fdNdxCutVector = 0; |
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| 95 | |
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| 96 | isInitialised = false; |
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| 97 | } |
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| 98 | |
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| 99 | //////////////////////////////////////////////////////////////////////////// |
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| 100 | |
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| 101 | G4PAIModel::~G4PAIModel() |
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| 102 | { |
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| 103 | // G4cout << "PAI: start destruction" << G4endl; |
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| 104 | if(fParticleEnergyVector) delete fParticleEnergyVector; |
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| 105 | if(fdEdxVector) delete fdEdxVector ; |
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| 106 | if(fLambdaVector) delete fLambdaVector; |
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| 107 | if(fdNdxCutVector) delete fdNdxCutVector; |
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| 108 | |
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| 109 | if( fPAItransferTable ) |
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| 110 | { |
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| 111 | fPAItransferTable->clearAndDestroy(); |
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| 112 | delete fPAItransferTable ; |
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| 113 | } |
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| 114 | if( fPAIdEdxTable ) |
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| 115 | { |
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| 116 | fPAIdEdxTable->clearAndDestroy(); |
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| 117 | delete fPAIdEdxTable ; |
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| 118 | } |
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| 119 | if(fSandiaPhotoAbsCof) |
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| 120 | { |
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| 121 | for(G4int i=0;i<fSandiaIntervalNumber;i++) |
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| 122 | { |
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| 123 | delete[] fSandiaPhotoAbsCof[i]; |
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| 124 | } |
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| 125 | delete[] fSandiaPhotoAbsCof; |
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| 126 | } |
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| 127 | //G4cout << "PAI: end destruction" << G4endl; |
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| 128 | } |
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| 129 | |
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| 130 | /////////////////////////////////////////////////////////////////////////////// |
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| 131 | |
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| 132 | void G4PAIModel::SetParticle(const G4ParticleDefinition* p) |
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| 133 | { |
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| 134 | if(fParticle == p) return; |
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| 135 | fParticle = p; |
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| 136 | fMass = fParticle->GetPDGMass(); |
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| 137 | fSpin = fParticle->GetPDGSpin(); |
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| 138 | G4double q = fParticle->GetPDGCharge()/eplus; |
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| 139 | fChargeSquare = q*q; |
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| 140 | fLowKinEnergy = 0.2*MeV*fMass/proton_mass_c2; |
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| 141 | fRatio = electron_mass_c2/fMass; |
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| 142 | fQc = fMass/fRatio; |
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| 143 | } |
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| 144 | |
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| 145 | //////////////////////////////////////////////////////////////////////////// |
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| 146 | |
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| 147 | void G4PAIModel::Initialise(const G4ParticleDefinition* p, |
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| 148 | const G4DataVector&) |
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| 149 | { |
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[1315] | 150 | G4cout<<"G4PAIModel::Initialise for "<<p->GetParticleName()<<G4endl; |
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[819] | 151 | if(isInitialised) return; |
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| 152 | isInitialised = true; |
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| 153 | |
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| 154 | SetParticle(p); |
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| 155 | fLowestKineticEnergy = fMass*(fLowestGamma - 1.0); |
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| 156 | fHighestKineticEnergy = fMass*(fHighestGamma - 1.0); |
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| 157 | |
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| 158 | fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy, |
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| 159 | fHighestKineticEnergy, |
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| 160 | fTotBin); |
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| 161 | |
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[1055] | 162 | fParticleChange = GetParticleChangeForLoss(); |
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[819] | 163 | |
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| 164 | // Prepare initialization |
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| 165 | const G4ProductionCutsTable* theCoupleTable = |
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| 166 | G4ProductionCutsTable::GetProductionCutsTable(); |
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| 167 | const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable(); |
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| 168 | size_t numOfMat = G4Material::GetNumberOfMaterials(); |
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| 169 | size_t numRegions = fPAIRegionVector.size(); |
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| 170 | |
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| 171 | for(size_t iReg = 0; iReg < numRegions; ++iReg) // region loop |
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| 172 | { |
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| 173 | const G4Region* curReg = fPAIRegionVector[iReg]; |
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| 174 | for(size_t jMat = 0; jMat < numOfMat; ++jMat) // region material loop |
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| 175 | { |
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| 176 | fMaterial = (*theMaterialTable)[jMat]; |
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| 177 | fCutCouple = theCoupleTable->GetMaterialCutsCouple( fMaterial, |
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| 178 | curReg->GetProductionCuts() ); |
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[1055] | 179 | //G4cout << "Reg <" <<curReg->GetName() << "> mat <" |
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| 180 | // << fMaterial->GetName() << "> fCouple= " |
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[1196] | 181 | // << fCutCouple<<" " << p->GetParticleName() <<G4endl; |
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[819] | 182 | if( fCutCouple ) { |
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| 183 | fMaterialCutsCoupleVector.push_back(fCutCouple); |
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| 184 | |
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[1196] | 185 | fPAItransferTable = new G4PhysicsTable(fTotBin+1); |
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| 186 | fPAIdEdxTable = new G4PhysicsTable(fTotBin+1); |
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| 187 | |
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[819] | 188 | fDeltaCutInKinEnergy = |
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| 189 | (*theCoupleTable->GetEnergyCutsVector(1))[fCutCouple->GetIndex()]; |
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| 190 | |
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| 191 | //ComputeSandiaPhotoAbsCof(); |
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| 192 | BuildPAIonisationTable(); |
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| 193 | |
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| 194 | fPAIxscBank.push_back(fPAItransferTable); |
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| 195 | fPAIdEdxBank.push_back(fPAIdEdxTable); |
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| 196 | fdEdxTable.push_back(fdEdxVector); |
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| 197 | |
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| 198 | BuildLambdaVector(); |
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| 199 | fdNdxCutTable.push_back(fdNdxCutVector); |
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| 200 | fLambdaTable.push_back(fLambdaVector); |
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| 201 | } |
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| 202 | } |
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| 203 | } |
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| 204 | } |
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| 205 | |
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| 206 | ////////////////////////////////////////////////////////////////// |
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| 207 | |
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[1055] | 208 | void G4PAIModel::InitialiseMe(const G4ParticleDefinition*) |
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| 209 | {} |
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| 210 | |
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| 211 | ////////////////////////////////////////////////////////////////// |
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| 212 | |
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[819] | 213 | void G4PAIModel::ComputeSandiaPhotoAbsCof() |
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| 214 | { |
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| 215 | G4int i, j, numberOfElements ; |
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| 216 | static const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable(); |
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| 217 | |
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| 218 | G4SandiaTable thisMaterialSandiaTable(fMatIndex) ; |
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| 219 | numberOfElements = (*theMaterialTable)[fMatIndex]-> |
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| 220 | GetNumberOfElements(); |
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| 221 | G4int* thisMaterialZ = new G4int[numberOfElements] ; |
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| 222 | |
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| 223 | for(i=0;i<numberOfElements;i++) |
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| 224 | { |
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| 225 | thisMaterialZ[i] = |
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| 226 | (G4int)(*theMaterialTable)[fMatIndex]->GetElement(i)->GetZ() ; |
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| 227 | } |
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| 228 | fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaIntervals |
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| 229 | (thisMaterialZ,numberOfElements) ; |
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| 230 | |
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| 231 | fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaMixing |
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| 232 | ( thisMaterialZ , |
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| 233 | (*theMaterialTable)[fMatIndex]->GetFractionVector() , |
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| 234 | numberOfElements,fSandiaIntervalNumber) ; |
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| 235 | |
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| 236 | fSandiaPhotoAbsCof = new G4double*[fSandiaIntervalNumber] ; |
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| 237 | |
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| 238 | for(i=0;i<fSandiaIntervalNumber;i++) fSandiaPhotoAbsCof[i] = new G4double[5] ; |
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| 239 | |
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| 240 | for( i = 0 ; i < fSandiaIntervalNumber ; i++ ) |
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| 241 | { |
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| 242 | fSandiaPhotoAbsCof[i][0] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,0) ; |
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| 243 | |
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| 244 | for( j = 1; j < 5 ; j++ ) |
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| 245 | { |
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| 246 | fSandiaPhotoAbsCof[i][j] = thisMaterialSandiaTable. |
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| 247 | GetPhotoAbsorpCof(i+1,j)* |
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| 248 | (*theMaterialTable)[fMatIndex]->GetDensity() ; |
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| 249 | } |
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| 250 | } |
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| 251 | // delete[] thisMaterialZ ; |
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| 252 | } |
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| 253 | |
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| 254 | //////////////////////////////////////////////////////////////////////////// |
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| 255 | // |
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| 256 | // Build tables for the ionization energy loss |
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| 257 | // the tables are built for MATERIALS |
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| 258 | // ********* |
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| 259 | |
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| 260 | void G4PAIModel::BuildPAIonisationTable() |
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| 261 | { |
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| 262 | G4double LowEdgeEnergy , ionloss ; |
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| 263 | G4double tau, Tmax, Tmin, Tkin, deltaLow, gamma, bg2 ; |
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| 264 | |
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| 265 | fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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| 266 | fHighestKineticEnergy, |
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| 267 | fTotBin); |
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| 268 | G4SandiaTable* sandia = fMaterial->GetSandiaTable(); |
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| 269 | |
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| 270 | Tmin = sandia->GetSandiaCofForMaterialPAI(0,0)*keV; |
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| 271 | deltaLow = 100.*eV; // 0.5*eV ; |
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| 272 | |
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[1196] | 273 | for (G4int i = 0 ; i <= fTotBin ; i++) //The loop for the kinetic energy |
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[819] | 274 | { |
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| 275 | LowEdgeEnergy = fParticleEnergyVector->GetLowEdgeEnergy(i) ; |
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| 276 | tau = LowEdgeEnergy/fMass ; |
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| 277 | gamma = tau +1. ; |
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| 278 | // G4cout<<"gamma = "<<gamma<<endl ; |
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| 279 | bg2 = tau*( tau + 2. ); |
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| 280 | Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy); |
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| 281 | // Tmax = std::min(fDeltaCutInKinEnergy, Tmax); |
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| 282 | Tkin = Tmax ; |
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| 283 | |
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| 284 | if ( Tmax < Tmin + deltaLow ) // low energy safety |
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| 285 | Tkin = Tmin + deltaLow ; |
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| 286 | |
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| 287 | fPAIySection.Initialize(fMaterial, Tkin, bg2); |
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| 288 | |
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| 289 | // G4cout<<"ionloss = "<<ionloss*cm/keV<<" keV/cm"<<endl ; |
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| 290 | // G4cout<<"n1 = "<<protonPAI.GetIntegralPAIxSection(1)*cm<<" 1/cm"<<endl ; |
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| 291 | // G4cout<<"protonPAI.GetSplineSize() = "<< |
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| 292 | // protonPAI.GetSplineSize()<<G4endl<<G4endl ; |
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| 293 | |
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| 294 | G4int n = fPAIySection.GetSplineSize(); |
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| 295 | G4PhysicsFreeVector* transferVector = new G4PhysicsFreeVector(n) ; |
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| 296 | G4PhysicsFreeVector* dEdxVector = new G4PhysicsFreeVector(n); |
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| 297 | |
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| 298 | for( G4int k = 0 ; k < n; k++ ) |
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| 299 | { |
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| 300 | transferVector->PutValue( k , |
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| 301 | fPAIySection.GetSplineEnergy(k+1), |
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| 302 | fPAIySection.GetIntegralPAIySection(k+1) ) ; |
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| 303 | dEdxVector->PutValue( k , |
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| 304 | fPAIySection.GetSplineEnergy(k+1), |
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| 305 | fPAIySection.GetIntegralPAIdEdx(k+1) ) ; |
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| 306 | } |
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| 307 | ionloss = fPAIySection.GetMeanEnergyLoss() ; // total <dE/dx> |
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| 308 | |
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| 309 | if ( ionloss < DBL_MIN) ionloss = DBL_MIN; |
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| 310 | fdEdxVector->PutValue(i,ionloss) ; |
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| 311 | |
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| 312 | fPAItransferTable->insertAt(i,transferVector) ; |
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| 313 | fPAIdEdxTable->insertAt(i,dEdxVector) ; |
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| 314 | |
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| 315 | } // end of Tkin loop |
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| 316 | } |
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| 317 | |
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| 318 | /////////////////////////////////////////////////////////////////////// |
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| 319 | // |
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| 320 | // Build mean free path tables for the delta ray production process |
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| 321 | // tables are built for MATERIALS |
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| 322 | // |
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| 323 | |
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| 324 | void G4PAIModel::BuildLambdaVector() |
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| 325 | { |
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| 326 | fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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| 327 | fHighestKineticEnergy, |
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| 328 | fTotBin ) ; |
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| 329 | fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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| 330 | fHighestKineticEnergy, |
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| 331 | fTotBin ) ; |
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| 332 | if(fVerbose > 1) |
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| 333 | { |
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| 334 | G4cout<<"PAIModel DeltaCutInKineticEnergyNow = " |
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| 335 | <<fDeltaCutInKinEnergy/keV<<" keV"<<G4endl; |
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| 336 | } |
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[1196] | 337 | for (G4int i = 0 ; i <= fTotBin ; i++ ) |
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[819] | 338 | { |
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| 339 | G4double dNdxCut = GetdNdxCut(i,fDeltaCutInKinEnergy) ; |
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[1196] | 340 | //G4cout << "i= " << i << " x= " << dNdxCut << G4endl; |
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| 341 | if(dNdxCut < 0.0) dNdxCut = 0.0; |
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| 342 | // G4double lambda = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut ; |
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| 343 | G4double lambda = DBL_MAX; |
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| 344 | if(dNdxCut > 0.0) lambda = 1.0/dNdxCut; |
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[819] | 345 | |
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| 346 | fLambdaVector->PutValue(i, lambda) ; |
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| 347 | fdNdxCutVector->PutValue(i, dNdxCut) ; |
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| 348 | } |
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| 349 | } |
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| 350 | |
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| 351 | /////////////////////////////////////////////////////////////////////// |
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| 352 | // |
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| 353 | // Returns integral PAI cross section for energy transfers >= transferCut |
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| 354 | |
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| 355 | G4double |
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| 356 | G4PAIModel::GetdNdxCut( G4int iPlace, G4double transferCut) |
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| 357 | { |
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| 358 | G4int iTransfer; |
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| 359 | G4double x1, x2, y1, y2, dNdxCut; |
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| 360 | // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl; |
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| 361 | // G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) |
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| 362 | // <<G4endl; |
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| 363 | for( iTransfer = 0 ; |
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| 364 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ; |
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| 365 | iTransfer++) |
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| 366 | { |
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| 367 | if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer)) |
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| 368 | { |
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| 369 | break ; |
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| 370 | } |
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| 371 | } |
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| 372 | if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ) |
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| 373 | { |
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| 374 | iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ; |
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| 375 | } |
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| 376 | y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1) ; |
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| 377 | y2 = (*(*fPAItransferTable)(iPlace))(iTransfer) ; |
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[1196] | 378 | if(y1 < 0.0) y1 = 0.0; |
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| 379 | if(y2 < 0.0) y2 = 0.0; |
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[819] | 380 | // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl; |
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| 381 | x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ; |
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| 382 | x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ; |
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| 383 | // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl; |
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| 384 | |
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| 385 | if ( y1 == y2 ) dNdxCut = y2 ; |
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| 386 | else |
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| 387 | { |
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| 388 | // if ( x1 == x2 ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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[1055] | 389 | // if ( std::abs(x1-x2) <= eV ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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| 390 | if ( std::abs(x1-x2) <= eV ) dNdxCut = y1 + (y2 - y1)*0.5 ; |
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[819] | 391 | else dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ; |
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| 392 | } |
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| 393 | // G4cout<<""<<dNdxCut<<G4endl; |
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[1196] | 394 | if(dNdxCut < 0.0) dNdxCut = 0.0; |
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[819] | 395 | return dNdxCut ; |
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| 396 | } |
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| 397 | /////////////////////////////////////////////////////////////////////// |
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| 398 | // |
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| 399 | // Returns integral dEdx for energy transfers >= transferCut |
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| 400 | |
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| 401 | G4double |
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| 402 | G4PAIModel::GetdEdxCut( G4int iPlace, G4double transferCut) |
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| 403 | { |
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| 404 | G4int iTransfer; |
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| 405 | G4double x1, x2, y1, y2, dEdxCut; |
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[1196] | 406 | //G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl; |
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[819] | 407 | // G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) |
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| 408 | // <<G4endl; |
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| 409 | for( iTransfer = 0 ; |
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| 410 | iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ; |
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| 411 | iTransfer++) |
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| 412 | { |
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| 413 | if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer)) |
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| 414 | { |
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| 415 | break ; |
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| 416 | } |
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| 417 | } |
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| 418 | if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ) |
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| 419 | { |
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| 420 | iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ; |
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| 421 | } |
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| 422 | y1 = (*(*fPAIdEdxTable)(iPlace))(iTransfer-1) ; |
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| 423 | y2 = (*(*fPAIdEdxTable)(iPlace))(iTransfer) ; |
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[1196] | 424 | if(y1 < 0.0) y1 = 0.0; |
---|
| 425 | if(y2 < 0.0) y2 = 0.0; |
---|
| 426 | //G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl; |
---|
[819] | 427 | x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ; |
---|
| 428 | x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ; |
---|
[1196] | 429 | //G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl; |
---|
[819] | 430 | |
---|
| 431 | if ( y1 == y2 ) dEdxCut = y2 ; |
---|
| 432 | else |
---|
| 433 | { |
---|
| 434 | // if ( x1 == x2 ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
---|
[1055] | 435 | // if ( std::abs(x1-x2) <= eV ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
---|
| 436 | if ( std::abs(x1-x2) <= eV ) dEdxCut = y1 + (y2 - y1)*0.5 ; |
---|
[819] | 437 | else dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ; |
---|
| 438 | } |
---|
[1196] | 439 | //G4cout<<""<<dEdxCut<<G4endl; |
---|
| 440 | if(dEdxCut < 0.0) dEdxCut = 0.0; |
---|
[819] | 441 | return dEdxCut ; |
---|
| 442 | } |
---|
| 443 | |
---|
| 444 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 445 | |
---|
[1055] | 446 | G4double G4PAIModel::ComputeDEDXPerVolume(const G4Material*, |
---|
| 447 | const G4ParticleDefinition* p, |
---|
| 448 | G4double kineticEnergy, |
---|
| 449 | G4double cutEnergy) |
---|
[819] | 450 | { |
---|
| 451 | G4int iTkin,iPlace; |
---|
[1055] | 452 | |
---|
| 453 | //G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy); |
---|
| 454 | G4double cut = cutEnergy; |
---|
| 455 | |
---|
[819] | 456 | G4double massRatio = fMass/p->GetPDGMass(); |
---|
| 457 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
| 458 | G4double charge = p->GetPDGCharge(); |
---|
[1055] | 459 | G4double charge2 = charge*charge; |
---|
| 460 | const G4MaterialCutsCouple* matCC = CurrentCouple(); |
---|
[819] | 461 | |
---|
[1196] | 462 | size_t jMat = 0; |
---|
| 463 | for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat ) |
---|
[819] | 464 | { |
---|
| 465 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
| 466 | } |
---|
[1196] | 467 | //G4cout << "jMat= " << jMat |
---|
| 468 | // << " jMax= " << fMaterialCutsCoupleVector.size() |
---|
| 469 | // << " matCC: " << matCC; |
---|
| 470 | //if(matCC) G4cout << " mat: " << matCC->GetMaterial()->GetName(); |
---|
| 471 | // G4cout << G4endl; |
---|
| 472 | if(jMat == fMaterialCutsCoupleVector.size()) return 0.0; |
---|
[819] | 473 | |
---|
| 474 | fPAIdEdxTable = fPAIdEdxBank[jMat]; |
---|
| 475 | fdEdxVector = fdEdxTable[jMat]; |
---|
[1196] | 476 | for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++) |
---|
[819] | 477 | { |
---|
| 478 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 479 | } |
---|
[1196] | 480 | //G4cout << "E= " << scaledTkin << " iTkin= " << iTkin |
---|
| 481 | // << " " << fdEdxVector->GetVectorLength()<<G4endl; |
---|
[819] | 482 | iPlace = iTkin - 1; |
---|
| 483 | if(iPlace < 0) iPlace = 0; |
---|
[1196] | 484 | else if(iPlace >= fTotBin) iPlace = fTotBin-1; |
---|
[1055] | 485 | G4double dEdx = charge2*( (*fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cut) ); |
---|
[819] | 486 | if( dEdx < 0.) dEdx = 0.; |
---|
| 487 | return dEdx; |
---|
| 488 | } |
---|
| 489 | |
---|
| 490 | ///////////////////////////////////////////////////////////////////////// |
---|
| 491 | |
---|
[1055] | 492 | G4double G4PAIModel::CrossSectionPerVolume( const G4Material*, |
---|
| 493 | const G4ParticleDefinition* p, |
---|
| 494 | G4double kineticEnergy, |
---|
| 495 | G4double cutEnergy, |
---|
| 496 | G4double maxEnergy ) |
---|
[819] | 497 | { |
---|
| 498 | G4int iTkin,iPlace; |
---|
[1055] | 499 | G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy); |
---|
| 500 | if(tmax <= cutEnergy) return 0.0; |
---|
[819] | 501 | G4double massRatio = fMass/p->GetPDGMass(); |
---|
| 502 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
| 503 | G4double charge = p->GetPDGCharge(); |
---|
| 504 | G4double charge2 = charge*charge, cross, cross1, cross2; |
---|
[1055] | 505 | const G4MaterialCutsCouple* matCC = CurrentCouple(); |
---|
[819] | 506 | |
---|
[1196] | 507 | size_t jMat = 0; |
---|
| 508 | for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat ) |
---|
[819] | 509 | { |
---|
| 510 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
| 511 | } |
---|
[1196] | 512 | if(jMat == fMaterialCutsCoupleVector.size()) return 0.0; |
---|
[819] | 513 | |
---|
| 514 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
| 515 | |
---|
[1196] | 516 | for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++) |
---|
[819] | 517 | { |
---|
| 518 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 519 | } |
---|
| 520 | iPlace = iTkin - 1; |
---|
| 521 | if(iPlace < 0) iPlace = 0; |
---|
[1196] | 522 | else if(iPlace >= fTotBin) iPlace = fTotBin-1; |
---|
[819] | 523 | |
---|
[1196] | 524 | //G4cout<<"iPlace = "<<iPlace<<"; tmax = " |
---|
[819] | 525 | // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl; |
---|
| 526 | cross1 = GetdNdxCut(iPlace,tmax) ; |
---|
[1196] | 527 | //G4cout<<"cross1 = "<<cross1<<G4endl; |
---|
[819] | 528 | cross2 = GetdNdxCut(iPlace,cutEnergy) ; |
---|
[1196] | 529 | //G4cout<<"cross2 = "<<cross2<<G4endl; |
---|
[819] | 530 | cross = (cross2-cross1)*charge2; |
---|
[1196] | 531 | //G4cout<<"cross = "<<cross<<G4endl; |
---|
| 532 | if( cross < DBL_MIN) cross = 0.0; |
---|
[819] | 533 | // if( cross2 < DBL_MIN) cross2 = DBL_MIN; |
---|
| 534 | |
---|
| 535 | // return cross2; |
---|
| 536 | return cross; |
---|
| 537 | } |
---|
| 538 | |
---|
| 539 | /////////////////////////////////////////////////////////////////////////// |
---|
| 540 | // |
---|
| 541 | // It is analog of PostStepDoIt in terms of secondary electron. |
---|
| 542 | // |
---|
| 543 | |
---|
| 544 | void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp, |
---|
| 545 | const G4MaterialCutsCouple* matCC, |
---|
| 546 | const G4DynamicParticle* dp, |
---|
| 547 | G4double tmin, |
---|
| 548 | G4double maxEnergy) |
---|
| 549 | { |
---|
[1196] | 550 | size_t jMat = 0; |
---|
| 551 | for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat ) |
---|
[819] | 552 | { |
---|
| 553 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
| 554 | } |
---|
[1196] | 555 | if(jMat == fMaterialCutsCoupleVector.size()) return; |
---|
[819] | 556 | |
---|
| 557 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
| 558 | fdNdxCutVector = fdNdxCutTable[jMat]; |
---|
| 559 | |
---|
| 560 | G4double tmax = std::min(MaxSecondaryKinEnergy(dp), maxEnergy); |
---|
| 561 | if( tmin >= tmax && fVerbose > 0) |
---|
| 562 | { |
---|
| 563 | G4cout<<"G4PAIModel::SampleSecondary: tmin >= tmax "<<G4endl; |
---|
| 564 | } |
---|
| 565 | G4ThreeVector direction= dp->GetMomentumDirection(); |
---|
| 566 | G4double particleMass = dp->GetMass(); |
---|
| 567 | G4double kineticEnergy = dp->GetKineticEnergy(); |
---|
| 568 | |
---|
| 569 | G4double massRatio = fMass/particleMass; |
---|
| 570 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
| 571 | G4double totalEnergy = kineticEnergy + particleMass; |
---|
| 572 | G4double pSquare = kineticEnergy*(totalEnergy+particleMass); |
---|
| 573 | |
---|
| 574 | G4double deltaTkin = GetPostStepTransfer(scaledTkin); |
---|
| 575 | |
---|
| 576 | // G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV<<" keV "<<G4endl; |
---|
| 577 | |
---|
| 578 | if( deltaTkin <= 0. && fVerbose > 0) |
---|
| 579 | { |
---|
| 580 | G4cout<<"G4PAIModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl; |
---|
| 581 | } |
---|
| 582 | if( deltaTkin <= 0.) return; |
---|
| 583 | |
---|
| 584 | if( deltaTkin > tmax) deltaTkin = tmax; |
---|
| 585 | |
---|
| 586 | G4double deltaTotalMomentum = sqrt(deltaTkin*(deltaTkin + 2. * electron_mass_c2 )); |
---|
| 587 | G4double totalMomentum = sqrt(pSquare); |
---|
| 588 | G4double costheta = deltaTkin*(totalEnergy + electron_mass_c2) |
---|
| 589 | /(deltaTotalMomentum * totalMomentum); |
---|
| 590 | |
---|
| 591 | if( costheta > 0.99999 ) costheta = 0.99999; |
---|
| 592 | G4double sintheta = 0.0; |
---|
| 593 | G4double sin2 = 1. - costheta*costheta; |
---|
| 594 | if( sin2 > 0.) sintheta = sqrt(sin2); |
---|
| 595 | |
---|
| 596 | // direction of the delta electron |
---|
| 597 | G4double phi = twopi*G4UniformRand(); |
---|
| 598 | G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta; |
---|
| 599 | |
---|
| 600 | G4ThreeVector deltaDirection(dirx,diry,dirz); |
---|
| 601 | deltaDirection.rotateUz(direction); |
---|
| 602 | deltaDirection.unit(); |
---|
| 603 | |
---|
| 604 | // primary change |
---|
| 605 | kineticEnergy -= deltaTkin; |
---|
| 606 | G4ThreeVector dir = totalMomentum*direction - deltaTotalMomentum*deltaDirection; |
---|
| 607 | direction = dir.unit(); |
---|
| 608 | fParticleChange->SetProposedKineticEnergy(kineticEnergy); |
---|
| 609 | fParticleChange->SetProposedMomentumDirection(direction); |
---|
| 610 | |
---|
| 611 | // create G4DynamicParticle object for e- delta ray |
---|
| 612 | G4DynamicParticle* deltaRay = new G4DynamicParticle; |
---|
| 613 | deltaRay->SetDefinition(G4Electron::Electron()); |
---|
| 614 | deltaRay->SetKineticEnergy( deltaTkin ); // !!! trick for last steps /2.0 ??? |
---|
| 615 | deltaRay->SetMomentumDirection(deltaDirection); |
---|
| 616 | |
---|
| 617 | vdp->push_back(deltaRay); |
---|
| 618 | } |
---|
| 619 | |
---|
| 620 | |
---|
| 621 | /////////////////////////////////////////////////////////////////////// |
---|
| 622 | // |
---|
| 623 | // Returns post step PAI energy transfer > cut electron energy according to passed |
---|
| 624 | // scaled kinetic energy of particle |
---|
| 625 | |
---|
| 626 | G4double |
---|
| 627 | G4PAIModel::GetPostStepTransfer( G4double scaledTkin ) |
---|
| 628 | { |
---|
| 629 | // G4cout<<"G4PAIModel::GetPostStepTransfer"<<G4endl ; |
---|
| 630 | |
---|
| 631 | G4int iTkin, iTransfer, iPlace ; |
---|
| 632 | G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ; |
---|
| 633 | |
---|
[1196] | 634 | for(iTkin=0;iTkin<=fTotBin;iTkin++) |
---|
[819] | 635 | { |
---|
| 636 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 637 | } |
---|
| 638 | iPlace = iTkin - 1 ; |
---|
| 639 | // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ; |
---|
| 640 | if(iPlace < 0) iPlace = 0; |
---|
[1196] | 641 | else if(iPlace >= fTotBin) iPlace = fTotBin-1; |
---|
[819] | 642 | dNdxCut1 = (*fdNdxCutVector)(iPlace) ; |
---|
| 643 | // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ; |
---|
| 644 | |
---|
| 645 | |
---|
| 646 | if(iTkin == fTotBin) // Fermi plato, try from left |
---|
| 647 | { |
---|
| 648 | position = dNdxCut1*G4UniformRand() ; |
---|
| 649 | |
---|
| 650 | for( iTransfer = 0; |
---|
| 651 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
| 652 | { |
---|
| 653 | if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ; |
---|
| 654 | } |
---|
| 655 | transfer = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 656 | } |
---|
| 657 | else |
---|
| 658 | { |
---|
| 659 | dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; |
---|
| 660 | // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ; |
---|
| 661 | if(iTkin == 0) // Tkin is too small, trying from right only |
---|
| 662 | { |
---|
| 663 | position = dNdxCut2*G4UniformRand() ; |
---|
| 664 | |
---|
| 665 | for( iTransfer = 0; |
---|
| 666 | iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ ) |
---|
| 667 | { |
---|
| 668 | if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ; |
---|
| 669 | } |
---|
| 670 | transfer = GetEnergyTransfer(iPlace+1,position,iTransfer); |
---|
| 671 | } |
---|
| 672 | else // general case: Tkin between two vectors of the material |
---|
| 673 | { |
---|
| 674 | E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; |
---|
| 675 | E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin) ; |
---|
| 676 | W = 1.0/(E2 - E1) ; |
---|
| 677 | W1 = (E2 - scaledTkin)*W ; |
---|
| 678 | W2 = (scaledTkin - E1)*W ; |
---|
| 679 | |
---|
| 680 | position = ( dNdxCut1*W1 + dNdxCut2*W2 )*G4UniformRand() ; |
---|
| 681 | |
---|
| 682 | // G4cout<<position<<"\t" ; |
---|
| 683 | |
---|
| 684 | G4int iTrMax1, iTrMax2, iTrMax; |
---|
| 685 | |
---|
| 686 | iTrMax1 = G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); |
---|
| 687 | iTrMax2 = G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); |
---|
| 688 | |
---|
| 689 | if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2; |
---|
| 690 | else iTrMax = iTrMax1; |
---|
| 691 | |
---|
| 692 | |
---|
| 693 | for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ ) |
---|
| 694 | { |
---|
| 695 | if( position >= |
---|
| 696 | ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + |
---|
| 697 | (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) break ; |
---|
| 698 | } |
---|
| 699 | transfer = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 700 | } |
---|
| 701 | } |
---|
| 702 | // G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ; |
---|
| 703 | if(transfer < 0.0 ) transfer = 0.0 ; |
---|
| 704 | // if(transfer < DBL_MIN ) transfer = DBL_MIN; |
---|
| 705 | |
---|
| 706 | return transfer ; |
---|
| 707 | } |
---|
| 708 | |
---|
| 709 | /////////////////////////////////////////////////////////////////////// |
---|
| 710 | // |
---|
| 711 | // Returns random PAI energy transfer according to passed |
---|
| 712 | // indexes of particle kinetic |
---|
| 713 | |
---|
| 714 | G4double |
---|
| 715 | G4PAIModel::GetEnergyTransfer( G4int iPlace, G4double position, G4int iTransfer ) |
---|
| 716 | { |
---|
| 717 | G4int iTransferMax; |
---|
| 718 | G4double x1, x2, y1, y2, energyTransfer; |
---|
| 719 | |
---|
| 720 | if(iTransfer == 0) |
---|
| 721 | { |
---|
| 722 | energyTransfer = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer); |
---|
| 723 | } |
---|
| 724 | else |
---|
| 725 | { |
---|
| 726 | iTransferMax = G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); |
---|
| 727 | |
---|
| 728 | if ( iTransfer >= iTransferMax ) iTransfer = iTransferMax - 1; |
---|
| 729 | |
---|
| 730 | y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1); |
---|
| 731 | y2 = (*(*fPAItransferTable)(iPlace))(iTransfer); |
---|
| 732 | |
---|
| 733 | x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1); |
---|
| 734 | x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer); |
---|
| 735 | |
---|
| 736 | if ( x1 == x2 ) energyTransfer = x2; |
---|
| 737 | else |
---|
| 738 | { |
---|
| 739 | if ( y1 == y2 ) energyTransfer = x1 + (x2 - x1)*G4UniformRand(); |
---|
| 740 | else |
---|
| 741 | { |
---|
| 742 | energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1); |
---|
| 743 | } |
---|
| 744 | } |
---|
| 745 | } |
---|
| 746 | return energyTransfer; |
---|
| 747 | } |
---|
| 748 | |
---|
| 749 | /////////////////////////////////////////////////////////////////////// |
---|
| 750 | |
---|
| 751 | G4double G4PAIModel::SampleFluctuations( const G4Material* material, |
---|
| 752 | const G4DynamicParticle* aParticle, |
---|
| 753 | G4double&, |
---|
| 754 | G4double& step, |
---|
| 755 | G4double&) |
---|
| 756 | { |
---|
[1196] | 757 | size_t jMat = 0; |
---|
| 758 | for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat ) |
---|
[819] | 759 | { |
---|
| 760 | if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break; |
---|
| 761 | } |
---|
[1196] | 762 | if(jMat == fMaterialCutsCoupleVector.size()) return 0.0; |
---|
[819] | 763 | |
---|
| 764 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
| 765 | fdNdxCutVector = fdNdxCutTable[jMat]; |
---|
| 766 | |
---|
[1196] | 767 | G4int iTkin, iTransfer, iPlace; |
---|
[819] | 768 | G4long numOfCollisions=0; |
---|
| 769 | |
---|
[1196] | 770 | //G4cout<<"G4PAIModel::SampleFluctuations"<<G4endl ; |
---|
| 771 | //G4cout<<"in: "<<fMaterialCutsCoupleVector[jMat]->GetMaterial()->GetName()<<G4endl; |
---|
[819] | 772 | G4double loss = 0.0, charge2 ; |
---|
| 773 | G4double stepSum = 0., stepDelta, lambda, omega; |
---|
| 774 | G4double position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber; |
---|
| 775 | G4bool numb = true; |
---|
| 776 | G4double Tkin = aParticle->GetKineticEnergy() ; |
---|
| 777 | G4double MassRatio = fMass/aParticle->GetDefinition()->GetPDGMass() ; |
---|
| 778 | G4double charge = aParticle->GetDefinition()->GetPDGCharge() ; |
---|
| 779 | charge2 = charge*charge ; |
---|
| 780 | G4double TkinScaled = Tkin*MassRatio ; |
---|
| 781 | |
---|
[1196] | 782 | for(iTkin=0;iTkin<=fTotBin;iTkin++) |
---|
[819] | 783 | { |
---|
| 784 | if(TkinScaled < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 785 | } |
---|
| 786 | iPlace = iTkin - 1 ; |
---|
| 787 | if(iPlace < 0) iPlace = 0; |
---|
[1196] | 788 | else if(iPlace >= fTotBin) iPlace = fTotBin - 1; |
---|
| 789 | //G4cout<<"from search, iPlace = "<<iPlace<<G4endl ; |
---|
[819] | 790 | dNdxCut1 = (*fdNdxCutVector)(iPlace) ; |
---|
[1196] | 791 | //G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ; |
---|
[819] | 792 | |
---|
| 793 | if(iTkin == fTotBin) // Fermi plato, try from left |
---|
| 794 | { |
---|
| 795 | meanNumber =((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*step*charge2; |
---|
| 796 | if(meanNumber < 0.) meanNumber = 0. ; |
---|
| 797 | // numOfCollisions = RandPoisson::shoot(meanNumber) ; |
---|
| 798 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
| 799 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
| 800 | else lambda = DBL_MAX; |
---|
| 801 | while(numb) |
---|
| 802 | { |
---|
| 803 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
| 804 | stepSum += stepDelta; |
---|
| 805 | if(stepSum >= step) break; |
---|
| 806 | numOfCollisions++; |
---|
| 807 | } |
---|
[1196] | 808 | //G4cout<<"##1 numOfCollisions = "<<numOfCollisions<<G4endl ; |
---|
[819] | 809 | |
---|
| 810 | while(numOfCollisions) |
---|
| 811 | { |
---|
| 812 | position = dNdxCut1+ |
---|
| 813 | ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*G4UniformRand() ; |
---|
| 814 | |
---|
| 815 | for( iTransfer = 0; |
---|
| 816 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
| 817 | { |
---|
| 818 | if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ; |
---|
| 819 | } |
---|
| 820 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
[1196] | 821 | //G4cout<<"G4PAIModel::SampleFluctuations, omega = "<<omega/keV<<" keV; "<<"\t"; |
---|
[819] | 822 | loss += omega; |
---|
| 823 | numOfCollisions-- ; |
---|
| 824 | } |
---|
| 825 | } |
---|
| 826 | else |
---|
| 827 | { |
---|
| 828 | dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; |
---|
[1196] | 829 | //G4cout<<"dNdxCut2 = "<<dNdxCut2<< " iTkin= "<<iTkin<<" iPlace= "<<iPlace<<G4endl; |
---|
[819] | 830 | |
---|
| 831 | if(iTkin == 0) // Tkin is too small, trying from right only |
---|
| 832 | { |
---|
| 833 | meanNumber =((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*step*charge2; |
---|
| 834 | if( meanNumber < 0. ) meanNumber = 0. ; |
---|
| 835 | // numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ; |
---|
| 836 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
[1196] | 837 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
| 838 | else lambda = DBL_MAX; |
---|
| 839 | while(numb) |
---|
| 840 | { |
---|
| 841 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
| 842 | stepSum += stepDelta; |
---|
| 843 | if(stepSum >= step) break; |
---|
| 844 | numOfCollisions++; |
---|
| 845 | } |
---|
[819] | 846 | |
---|
[1196] | 847 | //G4cout<<"##2 numOfCollisions = "<<numOfCollisions<<G4endl ; |
---|
[819] | 848 | |
---|
| 849 | while(numOfCollisions) |
---|
| 850 | { |
---|
| 851 | position = dNdxCut2+ |
---|
| 852 | ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*G4UniformRand(); |
---|
| 853 | |
---|
| 854 | for( iTransfer = 0; |
---|
| 855 | iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ ) |
---|
| 856 | { |
---|
| 857 | if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ; |
---|
| 858 | } |
---|
| 859 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
[1196] | 860 | //G4cout<<omega/keV<<"\t"; |
---|
[819] | 861 | loss += omega; |
---|
| 862 | numOfCollisions-- ; |
---|
| 863 | } |
---|
| 864 | } |
---|
| 865 | else // general case: Tkin between two vectors of the material |
---|
| 866 | { |
---|
| 867 | E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; |
---|
| 868 | E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin) ; |
---|
| 869 | W = 1.0/(E2 - E1) ; |
---|
| 870 | W1 = (E2 - TkinScaled)*W ; |
---|
| 871 | W2 = (TkinScaled - E1)*W ; |
---|
| 872 | |
---|
[1196] | 873 | //G4cout << fPAItransferTable->size() << G4endl; |
---|
| 874 | //G4cout<<"(*(*fPAItransferTable)(iPlace))(0) = "<< |
---|
[819] | 875 | // (*(*fPAItransferTable)(iPlace))(0)<<G4endl ; |
---|
[1196] | 876 | //G4cout<<"(*(*fPAItransferTable)(iPlace+1))(0) = "<< |
---|
[819] | 877 | // (*(*fPAItransferTable)(iPlace+1))(0)<<G4endl ; |
---|
| 878 | |
---|
| 879 | meanNumber=( ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*W1 + |
---|
| 880 | ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*W2 )*step*charge2; |
---|
| 881 | if(meanNumber<0.0) meanNumber = 0.0; |
---|
| 882 | // numOfCollisions = RandPoisson::shoot(meanNumber) ; |
---|
| 883 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
[1196] | 884 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
| 885 | else lambda = DBL_MAX; |
---|
| 886 | while(numb) |
---|
| 887 | { |
---|
| 888 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
| 889 | stepSum += stepDelta; |
---|
| 890 | if(stepSum >= step) break; |
---|
| 891 | numOfCollisions++; |
---|
| 892 | } |
---|
[819] | 893 | |
---|
[1196] | 894 | //G4cout<<"##3 numOfCollisions = "<<numOfCollisions<<endl ; |
---|
[819] | 895 | |
---|
| 896 | while(numOfCollisions) |
---|
| 897 | { |
---|
| 898 | position = dNdxCut1*W1 + dNdxCut2*W2 + |
---|
| 899 | ( ( (*(*fPAItransferTable)(iPlace))(0)-dNdxCut1 )*W1 + |
---|
| 900 | dNdxCut2+ |
---|
| 901 | ( (*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2 )*W2 )*G4UniformRand(); |
---|
| 902 | |
---|
| 903 | // G4cout<<position<<"\t" ; |
---|
| 904 | |
---|
| 905 | for( iTransfer = 0; |
---|
| 906 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
| 907 | { |
---|
| 908 | if( position >= |
---|
| 909 | ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + |
---|
| 910 | (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) |
---|
| 911 | { |
---|
| 912 | break ; |
---|
| 913 | } |
---|
| 914 | } |
---|
| 915 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 916 | // G4cout<<omega/keV<<"\t"; |
---|
| 917 | loss += omega; |
---|
| 918 | numOfCollisions-- ; |
---|
| 919 | } |
---|
| 920 | } |
---|
| 921 | } |
---|
[1196] | 922 | //G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = " |
---|
[819] | 923 | // <<step/mm<<" mm"<<G4endl ; |
---|
| 924 | if(loss > Tkin) loss=Tkin; |
---|
| 925 | if(loss < 0. ) loss = 0.; |
---|
| 926 | return loss ; |
---|
| 927 | |
---|
| 928 | } |
---|
| 929 | |
---|
| 930 | ////////////////////////////////////////////////////////////////////// |
---|
| 931 | // |
---|
| 932 | // Returns the statistical estimation of the energy loss distribution variance |
---|
| 933 | // |
---|
| 934 | |
---|
| 935 | |
---|
| 936 | G4double G4PAIModel::Dispersion( const G4Material* material, |
---|
| 937 | const G4DynamicParticle* aParticle, |
---|
| 938 | G4double& tmax, |
---|
| 939 | G4double& step ) |
---|
| 940 | { |
---|
| 941 | G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.; |
---|
| 942 | for(G4int i = 0 ; i < fMeanNumber; i++) |
---|
| 943 | { |
---|
| 944 | loss = SampleFluctuations(material,aParticle,tmax,step,meanLoss); |
---|
| 945 | sumLoss += loss; |
---|
| 946 | sumLoss2 += loss*loss; |
---|
| 947 | } |
---|
| 948 | meanLoss = sumLoss/fMeanNumber; |
---|
| 949 | sigma2 = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber; |
---|
| 950 | return sigma2; |
---|
| 951 | } |
---|
| 952 | |
---|
[1055] | 953 | ///////////////////////////////////////////////////////////////////// |
---|
[819] | 954 | |
---|
[1055] | 955 | G4double G4PAIModel::MaxSecondaryEnergy( const G4ParticleDefinition* p, |
---|
| 956 | G4double kinEnergy) |
---|
| 957 | { |
---|
| 958 | G4double tmax = kinEnergy; |
---|
| 959 | if(p == fElectron) tmax *= 0.5; |
---|
| 960 | else if(p != fPositron) { |
---|
| 961 | G4double mass = p->GetPDGMass(); |
---|
| 962 | G4double ratio= electron_mass_c2/mass; |
---|
| 963 | G4double gamma= kinEnergy/mass + 1.0; |
---|
| 964 | tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) / |
---|
| 965 | (1. + 2.0*gamma*ratio + ratio*ratio); |
---|
| 966 | } |
---|
| 967 | return tmax; |
---|
| 968 | } |
---|
| 969 | |
---|
| 970 | /////////////////////////////////////////////////////////////// |
---|
| 971 | |
---|
| 972 | void G4PAIModel::DefineForRegion(const G4Region* r) |
---|
| 973 | { |
---|
| 974 | fPAIRegionVector.push_back(r); |
---|
| 975 | } |
---|
| 976 | |
---|
[819] | 977 | // |
---|
| 978 | // |
---|
| 979 | ///////////////////////////////////////////////// |
---|
| 980 | |
---|
| 981 | |
---|
| 982 | |
---|
| 983 | |
---|
| 984 | |
---|
| 985 | |
---|