[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 | // File name: G4PAIModel.cc |
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| 27 | // |
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| 28 | // Author: Vladimir.Grichine@cern.ch on base of Vladimir Ivanchenko code |
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| 29 | // |
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| 30 | // Creation date: 05.10.2003 |
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| 31 | // |
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| 32 | // Modifications: |
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| 33 | // |
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| 34 | // 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary |
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| 35 | // 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection, SampleSecondary |
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| 36 | // 08.04.05 Major optimisation of internal interfaces (V.Ivantchenko) |
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| 37 | // |
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| 38 | |
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| 39 | #include "G4Region.hh" |
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| 40 | #include "G4PhysicsLogVector.hh" |
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| 41 | #include "G4PhysicsFreeVector.hh" |
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| 42 | #include "G4PhysicsTable.hh" |
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| 43 | #include "G4ProductionCutsTable.hh" |
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| 44 | #include "G4MaterialCutsCouple.hh" |
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| 45 | #include "G4MaterialTable.hh" |
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| 46 | #include "G4SandiaTable.hh" |
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| 47 | #include "G4OrderedTable.hh" |
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| 48 | |
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| 49 | #include "G4PAIModel.hh" |
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| 50 | #include "Randomize.hh" |
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| 51 | #include "G4Electron.hh" |
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| 52 | #include "G4Positron.hh" |
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| 53 | #include "G4Poisson.hh" |
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| 54 | #include "G4Step.hh" |
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| 55 | #include "G4Material.hh" |
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| 56 | #include "G4DynamicParticle.hh" |
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| 57 | #include "G4ParticleDefinition.hh" |
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| 58 | #include "G4ParticleChangeForLoss.hh" |
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| 59 | #include "G4GeometryTolerance.hh" |
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| 60 | |
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| 61 | //////////////////////////////////////////////////////////////////////// |
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| 62 | |
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| 63 | using namespace std; |
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| 64 | |
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| 65 | G4PAIModel::G4PAIModel(const G4ParticleDefinition* p, const G4String& nam) |
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| 66 | : G4VEmModel(nam),G4VEmFluctuationModel(nam), |
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| 67 | fVerbose(0), |
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| 68 | fLowestGamma(1.005), |
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| 69 | fHighestGamma(10000.), |
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| 70 | fTotBin(200), |
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| 71 | fMeanNumber(20), |
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| 72 | fParticle(0), |
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| 73 | fHighKinEnergy(100.*TeV), |
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| 74 | fTwoln10(2.0*log(10.0)), |
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| 75 | fBg2lim(0.0169), |
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| 76 | fTaulim(8.4146e-3) |
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| 77 | { |
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| 78 | if(p) SetParticle(p); |
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| 79 | |
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| 80 | fElectron = G4Electron::Electron(); |
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| 81 | fPositron = G4Positron::Positron(); |
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| 82 | |
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| 83 | fPAItransferTable = 0; |
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| 84 | fPAIdEdxTable = 0; |
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| 85 | fSandiaPhotoAbsCof = 0; |
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| 86 | fdEdxVector = 0; |
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| 87 | fLambdaVector = 0; |
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| 88 | fdNdxCutVector = 0; |
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| 89 | |
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| 90 | isInitialised = false; |
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| 91 | } |
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| 92 | |
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| 93 | //////////////////////////////////////////////////////////////////////////// |
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| 94 | |
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| 95 | G4PAIModel::~G4PAIModel() |
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| 96 | { |
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| 97 | // G4cout << "PAI: start destruction" << G4endl; |
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| 98 | if(fParticleEnergyVector) delete fParticleEnergyVector; |
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| 99 | if(fdEdxVector) delete fdEdxVector ; |
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| 100 | if(fLambdaVector) delete fLambdaVector; |
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| 101 | if(fdNdxCutVector) delete fdNdxCutVector; |
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| 102 | |
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| 103 | if( fPAItransferTable ) |
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| 104 | { |
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| 105 | fPAItransferTable->clearAndDestroy(); |
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| 106 | delete fPAItransferTable ; |
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| 107 | } |
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| 108 | if( fPAIdEdxTable ) |
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| 109 | { |
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| 110 | fPAIdEdxTable->clearAndDestroy(); |
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| 111 | delete fPAIdEdxTable ; |
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| 112 | } |
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| 113 | if(fSandiaPhotoAbsCof) |
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| 114 | { |
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| 115 | for(G4int i=0;i<fSandiaIntervalNumber;i++) |
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| 116 | { |
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| 117 | delete[] fSandiaPhotoAbsCof[i]; |
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| 118 | } |
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| 119 | delete[] fSandiaPhotoAbsCof; |
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| 120 | } |
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| 121 | //G4cout << "PAI: end destruction" << G4endl; |
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| 122 | } |
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| 123 | |
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| 124 | /////////////////////////////////////////////////////////////////////////////// |
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| 125 | |
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| 126 | void G4PAIModel::SetParticle(const G4ParticleDefinition* p) |
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| 127 | { |
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| 128 | if(fParticle == p) return; |
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| 129 | fParticle = p; |
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| 130 | fMass = fParticle->GetPDGMass(); |
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| 131 | fSpin = fParticle->GetPDGSpin(); |
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| 132 | G4double q = fParticle->GetPDGCharge()/eplus; |
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| 133 | fChargeSquare = q*q; |
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| 134 | fLowKinEnergy = 0.2*MeV*fMass/proton_mass_c2; |
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| 135 | fRatio = electron_mass_c2/fMass; |
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| 136 | fQc = fMass/fRatio; |
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| 137 | } |
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| 138 | |
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| 139 | //////////////////////////////////////////////////////////////////////////// |
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| 140 | |
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| 141 | void G4PAIModel::Initialise(const G4ParticleDefinition* p, |
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| 142 | const G4DataVector&) |
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| 143 | { |
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| 144 | if(isInitialised) return; |
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| 145 | isInitialised = true; |
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| 146 | |
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| 147 | SetParticle(p); |
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| 148 | fLowestKineticEnergy = fMass*(fLowestGamma - 1.0); |
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| 149 | fHighestKineticEnergy = fMass*(fHighestGamma - 1.0); |
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| 150 | |
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| 151 | fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy, |
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| 152 | fHighestKineticEnergy, |
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| 153 | fTotBin); |
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| 154 | |
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| 155 | if(pParticleChange) |
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| 156 | fParticleChange = reinterpret_cast<G4ParticleChangeForLoss*>(pParticleChange); |
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| 157 | else |
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| 158 | fParticleChange = new G4ParticleChangeForLoss(); |
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| 159 | |
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| 160 | // Prepare initialization |
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| 161 | |
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| 162 | fPAItransferTable = new G4PhysicsTable(fTotBin); |
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| 163 | fPAIdEdxTable = new G4PhysicsTable(fTotBin); |
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| 164 | |
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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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| 179 | if( fCutCouple ) { |
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| 180 | fMaterialCutsCoupleVector.push_back(fCutCouple); |
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| 181 | |
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| 182 | fDeltaCutInKinEnergy = |
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| 183 | (*theCoupleTable->GetEnergyCutsVector(1))[fCutCouple->GetIndex()]; |
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| 184 | |
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| 185 | //ComputeSandiaPhotoAbsCof(); |
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| 186 | BuildPAIonisationTable(); |
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| 187 | |
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| 188 | fPAIxscBank.push_back(fPAItransferTable); |
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| 189 | fPAIdEdxBank.push_back(fPAIdEdxTable); |
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| 190 | fdEdxTable.push_back(fdEdxVector); |
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| 191 | |
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| 192 | BuildLambdaVector(); |
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| 193 | fdNdxCutTable.push_back(fdNdxCutVector); |
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| 194 | fLambdaTable.push_back(fLambdaVector); |
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| 195 | } |
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| 196 | } |
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| 197 | } |
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| 198 | } |
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| 199 | |
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| 200 | ////////////////////////////////////////////////////////////////// |
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| 201 | |
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| 202 | void G4PAIModel::ComputeSandiaPhotoAbsCof() |
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| 203 | { |
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| 204 | G4int i, j, numberOfElements ; |
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| 205 | static const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable(); |
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| 206 | |
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| 207 | G4SandiaTable thisMaterialSandiaTable(fMatIndex) ; |
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| 208 | numberOfElements = (*theMaterialTable)[fMatIndex]-> |
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| 209 | GetNumberOfElements(); |
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| 210 | G4int* thisMaterialZ = new G4int[numberOfElements] ; |
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| 211 | |
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| 212 | for(i=0;i<numberOfElements;i++) |
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| 213 | { |
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| 214 | thisMaterialZ[i] = |
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| 215 | (G4int)(*theMaterialTable)[fMatIndex]->GetElement(i)->GetZ() ; |
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| 216 | } |
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| 217 | fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaIntervals |
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| 218 | (thisMaterialZ,numberOfElements) ; |
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| 219 | |
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| 220 | fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaMixing |
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| 221 | ( thisMaterialZ , |
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| 222 | (*theMaterialTable)[fMatIndex]->GetFractionVector() , |
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| 223 | numberOfElements,fSandiaIntervalNumber) ; |
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| 224 | |
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| 225 | fSandiaPhotoAbsCof = new G4double*[fSandiaIntervalNumber] ; |
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| 226 | |
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| 227 | for(i=0;i<fSandiaIntervalNumber;i++) fSandiaPhotoAbsCof[i] = new G4double[5] ; |
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| 228 | |
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| 229 | for( i = 0 ; i < fSandiaIntervalNumber ; i++ ) |
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| 230 | { |
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| 231 | fSandiaPhotoAbsCof[i][0] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,0) ; |
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| 232 | |
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| 233 | for( j = 1; j < 5 ; j++ ) |
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| 234 | { |
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| 235 | fSandiaPhotoAbsCof[i][j] = thisMaterialSandiaTable. |
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| 236 | GetPhotoAbsorpCof(i+1,j)* |
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| 237 | (*theMaterialTable)[fMatIndex]->GetDensity() ; |
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| 238 | } |
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| 239 | } |
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| 240 | // delete[] thisMaterialZ ; |
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| 241 | } |
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| 242 | |
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| 243 | //////////////////////////////////////////////////////////////////////////// |
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| 244 | // |
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| 245 | // Build tables for the ionization energy loss |
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| 246 | // the tables are built for MATERIALS |
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| 247 | // ********* |
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| 248 | |
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| 249 | void G4PAIModel::BuildPAIonisationTable() |
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| 250 | { |
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| 251 | G4double LowEdgeEnergy , ionloss ; |
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| 252 | G4double tau, Tmax, Tmin, Tkin, deltaLow, gamma, bg2 ; |
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| 253 | |
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| 254 | if(fdEdxVector) delete fdEdxVector; |
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| 255 | fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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| 256 | fHighestKineticEnergy, |
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| 257 | fTotBin); |
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| 258 | G4SandiaTable* sandia = fMaterial->GetSandiaTable(); |
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| 259 | |
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| 260 | Tmin = sandia->GetSandiaCofForMaterialPAI(0,0)*keV; |
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| 261 | deltaLow = 100.*eV; // 0.5*eV ; |
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| 262 | |
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| 263 | for (G4int i = 0 ; i < fTotBin ; i++) //The loop for the kinetic energy |
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| 264 | { |
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| 265 | LowEdgeEnergy = fParticleEnergyVector->GetLowEdgeEnergy(i) ; |
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| 266 | tau = LowEdgeEnergy/fMass ; |
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| 267 | gamma = tau +1. ; |
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| 268 | // G4cout<<"gamma = "<<gamma<<endl ; |
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| 269 | bg2 = tau*( tau + 2. ); |
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| 270 | Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy); |
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| 271 | // Tmax = std::min(fDeltaCutInKinEnergy, Tmax); |
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| 272 | Tkin = Tmax ; |
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| 273 | |
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| 274 | // G4cout<<"proton Tkin = "<<LowEdgeEnergy/MeV<<" MeV" |
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| 275 | // <<" Tmax = "<<Tmax/MeV<<" MeV"<<G4endl; |
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| 276 | |
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| 277 | if ( Tmax < Tmin + deltaLow ) // low energy safety |
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| 278 | Tkin = Tmin + deltaLow ; |
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| 279 | |
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| 280 | /* |
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| 281 | G4PAIxSection protonPAI( fMatIndex, |
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| 282 | Tkin, |
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| 283 | bg2, |
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| 284 | fSandiaPhotoAbsCof, |
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| 285 | fSandiaIntervalNumber ) ; |
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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 | // theLossTable->insert(fdEdxVector); |
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| 317 | // end of material loop |
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| 318 | // G4cout<<"G4PAIonisation::BuildPAIonisationTable() have been called"<<G4endl ; |
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| 319 | // G4cout<<"G4PAIonisation::BuildLossTable() have been called"<<G4endl ; |
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| 320 | } |
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| 321 | |
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| 322 | /////////////////////////////////////////////////////////////////////// |
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| 323 | // |
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| 324 | // Build mean free path tables for the delta ray production process |
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| 325 | // tables are built for MATERIALS |
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| 326 | // |
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| 327 | |
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| 328 | void G4PAIModel::BuildLambdaVector() |
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| 329 | { |
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| 330 | //G4double kCarTolerance = G4GeometryTolerance::GetInstance() |
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| 331 | // ->GetSurfaceTolerance(); |
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| 332 | |
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| 333 | if (fLambdaVector) delete fLambdaVector; |
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| 334 | if (fdNdxCutVector) delete fdNdxCutVector; |
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| 335 | |
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| 336 | fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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| 337 | fHighestKineticEnergy, |
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| 338 | fTotBin ) ; |
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| 339 | fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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| 340 | fHighestKineticEnergy, |
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| 341 | fTotBin ) ; |
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| 342 | if(fVerbose > 1) |
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| 343 | { |
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| 344 | G4cout<<"PAIModel DeltaCutInKineticEnergyNow = " |
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| 345 | <<fDeltaCutInKinEnergy/keV<<" keV"<<G4endl; |
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| 346 | } |
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| 347 | for (G4int i = 0 ; i < fTotBin ; i++ ) |
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| 348 | { |
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| 349 | G4double dNdxCut = GetdNdxCut(i,fDeltaCutInKinEnergy) ; |
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| 350 | G4double lambda = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut ; |
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| 351 | |
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| 352 | // if (lambda <= 1000*kCarTolerance) lambda = 1000*kCarTolerance ; // Mmm ??? |
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| 353 | |
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| 354 | fLambdaVector->PutValue(i, lambda) ; |
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| 355 | fdNdxCutVector->PutValue(i, dNdxCut) ; |
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| 356 | } |
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| 357 | } |
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| 358 | |
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| 359 | /////////////////////////////////////////////////////////////////////// |
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| 360 | // |
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| 361 | // Returns integral PAI cross section for energy transfers >= transferCut |
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| 362 | |
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| 363 | G4double |
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| 364 | G4PAIModel::GetdNdxCut( G4int iPlace, G4double transferCut) |
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| 365 | { |
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| 366 | G4int iTransfer; |
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| 367 | G4double x1, x2, y1, y2, dNdxCut; |
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| 368 | // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl; |
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| 369 | // G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) |
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| 370 | // <<G4endl; |
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| 371 | for( iTransfer = 0 ; |
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| 372 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ; |
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| 373 | iTransfer++) |
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| 374 | { |
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| 375 | if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer)) |
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| 376 | { |
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| 377 | break ; |
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| 378 | } |
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| 379 | } |
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| 380 | if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ) |
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| 381 | { |
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| 382 | iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ; |
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| 383 | } |
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| 384 | y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1) ; |
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| 385 | y2 = (*(*fPAItransferTable)(iPlace))(iTransfer) ; |
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| 386 | // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl; |
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| 387 | x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ; |
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| 388 | x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ; |
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| 389 | // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl; |
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| 390 | |
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| 391 | if ( y1 == y2 ) dNdxCut = y2 ; |
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| 392 | else |
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| 393 | { |
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| 394 | // if ( x1 == x2 ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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| 395 | if ( std::abs(x1-x2) <= eV ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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| 396 | else dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ; |
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| 397 | } |
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| 398 | // G4cout<<""<<dNdxCut<<G4endl; |
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| 399 | return dNdxCut ; |
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| 400 | } |
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| 401 | /////////////////////////////////////////////////////////////////////// |
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| 402 | // |
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| 403 | // Returns integral dEdx for energy transfers >= transferCut |
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| 404 | |
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| 405 | G4double |
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| 406 | G4PAIModel::GetdEdxCut( G4int iPlace, G4double transferCut) |
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| 407 | { |
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| 408 | G4int iTransfer; |
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| 409 | G4double x1, x2, y1, y2, dEdxCut; |
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| 410 | // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl; |
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| 411 | // G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) |
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| 412 | // <<G4endl; |
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| 413 | for( iTransfer = 0 ; |
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| 414 | iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ; |
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| 415 | iTransfer++) |
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| 416 | { |
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| 417 | if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer)) |
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| 418 | { |
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| 419 | break ; |
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| 420 | } |
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| 421 | } |
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| 422 | if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ) |
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| 423 | { |
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| 424 | iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ; |
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| 425 | } |
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| 426 | y1 = (*(*fPAIdEdxTable)(iPlace))(iTransfer-1) ; |
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| 427 | y2 = (*(*fPAIdEdxTable)(iPlace))(iTransfer) ; |
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| 428 | // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl; |
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| 429 | x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ; |
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| 430 | x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ; |
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| 431 | // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl; |
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| 432 | |
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| 433 | if ( y1 == y2 ) dEdxCut = y2 ; |
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| 434 | else |
---|
| 435 | { |
---|
| 436 | // if ( x1 == x2 ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
---|
| 437 | if ( std::abs(x1-x2) <= eV ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
---|
| 438 | else dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ; |
---|
| 439 | } |
---|
| 440 | // G4cout<<""<<dEdxCut<<G4endl; |
---|
| 441 | return dEdxCut ; |
---|
| 442 | } |
---|
| 443 | |
---|
| 444 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 445 | |
---|
| 446 | G4double G4PAIModel::ComputeDEDX(const G4MaterialCutsCouple* matCC, |
---|
| 447 | const G4ParticleDefinition* p, |
---|
| 448 | G4double kineticEnergy, |
---|
| 449 | G4double cutEnergy) |
---|
| 450 | { |
---|
| 451 | G4int iTkin,iPlace; |
---|
| 452 | size_t jMat; |
---|
| 453 | G4double massRatio = fMass/p->GetPDGMass(); |
---|
| 454 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
| 455 | G4double charge = p->GetPDGCharge(); |
---|
| 456 | G4double charge2 = charge*charge, dEdx; |
---|
| 457 | |
---|
| 458 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
| 459 | { |
---|
| 460 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
| 461 | } |
---|
| 462 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
| 463 | |
---|
| 464 | fPAIdEdxTable = fPAIdEdxBank[jMat]; |
---|
| 465 | fdEdxVector = fdEdxTable[jMat]; |
---|
| 466 | for(iTkin = 0 ; iTkin < fTotBin ; iTkin++) |
---|
| 467 | { |
---|
| 468 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 469 | } |
---|
| 470 | iPlace = iTkin - 1; |
---|
| 471 | if(iPlace < 0) iPlace = 0; |
---|
| 472 | dEdx = charge2*( (*fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cutEnergy) ) ; |
---|
| 473 | |
---|
| 474 | if( dEdx < 0.) dEdx = 0.; |
---|
| 475 | return dEdx; |
---|
| 476 | } |
---|
| 477 | |
---|
| 478 | ///////////////////////////////////////////////////////////////////////// |
---|
| 479 | |
---|
| 480 | G4double G4PAIModel::CrossSection( const G4MaterialCutsCouple* matCC, |
---|
| 481 | const G4ParticleDefinition* p, |
---|
| 482 | G4double kineticEnergy, |
---|
| 483 | G4double cutEnergy, |
---|
| 484 | G4double maxEnergy ) |
---|
| 485 | { |
---|
| 486 | G4int iTkin,iPlace; |
---|
| 487 | size_t jMat; |
---|
| 488 | G4double tmax = min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy); |
---|
| 489 | G4double massRatio = fMass/p->GetPDGMass(); |
---|
| 490 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
| 491 | G4double charge = p->GetPDGCharge(); |
---|
| 492 | G4double charge2 = charge*charge, cross, cross1, cross2; |
---|
| 493 | |
---|
| 494 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
| 495 | { |
---|
| 496 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
| 497 | } |
---|
| 498 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
| 499 | |
---|
| 500 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
| 501 | |
---|
| 502 | for(iTkin = 0 ; iTkin < fTotBin ; iTkin++) |
---|
| 503 | { |
---|
| 504 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 505 | } |
---|
| 506 | iPlace = iTkin - 1; |
---|
| 507 | if(iPlace < 0) iPlace = 0; |
---|
| 508 | |
---|
| 509 | // G4cout<<"iPlace = "<<iPlace<<"; tmax = " |
---|
| 510 | // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl; |
---|
| 511 | cross1 = GetdNdxCut(iPlace,tmax) ; |
---|
| 512 | // G4cout<<"cross1 = "<<cross1<<G4endl; |
---|
| 513 | cross2 = GetdNdxCut(iPlace,cutEnergy) ; |
---|
| 514 | // G4cout<<"cross2 = "<<cross2<<G4endl; |
---|
| 515 | cross = (cross2-cross1)*charge2; |
---|
| 516 | // G4cout<<"cross = "<<cross<<G4endl; |
---|
| 517 | if( cross < DBL_MIN) cross = DBL_MIN; |
---|
| 518 | // if( cross2 < DBL_MIN) cross2 = DBL_MIN; |
---|
| 519 | |
---|
| 520 | // return cross2; |
---|
| 521 | return cross; |
---|
| 522 | } |
---|
| 523 | |
---|
| 524 | /////////////////////////////////////////////////////////////////////////// |
---|
| 525 | // |
---|
| 526 | // It is analog of PostStepDoIt in terms of secondary electron. |
---|
| 527 | // |
---|
| 528 | |
---|
| 529 | void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp, |
---|
| 530 | const G4MaterialCutsCouple* matCC, |
---|
| 531 | const G4DynamicParticle* dp, |
---|
| 532 | G4double tmin, |
---|
| 533 | G4double maxEnergy) |
---|
| 534 | { |
---|
| 535 | size_t jMat; |
---|
| 536 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
| 537 | { |
---|
| 538 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
| 539 | } |
---|
| 540 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
| 541 | |
---|
| 542 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
| 543 | fdNdxCutVector = fdNdxCutTable[jMat]; |
---|
| 544 | |
---|
| 545 | G4double tmax = std::min(MaxSecondaryKinEnergy(dp), maxEnergy); |
---|
| 546 | if( tmin >= tmax && fVerbose > 0) |
---|
| 547 | { |
---|
| 548 | G4cout<<"G4PAIModel::SampleSecondary: tmin >= tmax "<<G4endl; |
---|
| 549 | } |
---|
| 550 | G4ThreeVector direction= dp->GetMomentumDirection(); |
---|
| 551 | G4double particleMass = dp->GetMass(); |
---|
| 552 | G4double kineticEnergy = dp->GetKineticEnergy(); |
---|
| 553 | |
---|
| 554 | G4double massRatio = fMass/particleMass; |
---|
| 555 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
| 556 | G4double totalEnergy = kineticEnergy + particleMass; |
---|
| 557 | G4double pSquare = kineticEnergy*(totalEnergy+particleMass); |
---|
| 558 | |
---|
| 559 | G4double deltaTkin = GetPostStepTransfer(scaledTkin); |
---|
| 560 | |
---|
| 561 | // G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV<<" keV "<<G4endl; |
---|
| 562 | |
---|
| 563 | if( deltaTkin <= 0. && fVerbose > 0) |
---|
| 564 | { |
---|
| 565 | G4cout<<"G4PAIModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl; |
---|
| 566 | } |
---|
| 567 | if( deltaTkin <= 0.) return; |
---|
| 568 | |
---|
| 569 | if( deltaTkin > tmax) deltaTkin = tmax; |
---|
| 570 | |
---|
| 571 | G4double deltaTotalMomentum = sqrt(deltaTkin*(deltaTkin + 2. * electron_mass_c2 )); |
---|
| 572 | G4double totalMomentum = sqrt(pSquare); |
---|
| 573 | G4double costheta = deltaTkin*(totalEnergy + electron_mass_c2) |
---|
| 574 | /(deltaTotalMomentum * totalMomentum); |
---|
| 575 | |
---|
| 576 | if( costheta > 0.99999 ) costheta = 0.99999; |
---|
| 577 | G4double sintheta = 0.0; |
---|
| 578 | G4double sin2 = 1. - costheta*costheta; |
---|
| 579 | if( sin2 > 0.) sintheta = sqrt(sin2); |
---|
| 580 | |
---|
| 581 | // direction of the delta electron |
---|
| 582 | G4double phi = twopi*G4UniformRand(); |
---|
| 583 | G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta; |
---|
| 584 | |
---|
| 585 | G4ThreeVector deltaDirection(dirx,diry,dirz); |
---|
| 586 | deltaDirection.rotateUz(direction); |
---|
| 587 | deltaDirection.unit(); |
---|
| 588 | |
---|
| 589 | // primary change |
---|
| 590 | kineticEnergy -= deltaTkin; |
---|
| 591 | G4ThreeVector dir = totalMomentum*direction - deltaTotalMomentum*deltaDirection; |
---|
| 592 | direction = dir.unit(); |
---|
| 593 | fParticleChange->SetProposedKineticEnergy(kineticEnergy); |
---|
| 594 | fParticleChange->SetProposedMomentumDirection(direction); |
---|
| 595 | |
---|
| 596 | // create G4DynamicParticle object for e- delta ray |
---|
| 597 | G4DynamicParticle* deltaRay = new G4DynamicParticle; |
---|
| 598 | deltaRay->SetDefinition(G4Electron::Electron()); |
---|
| 599 | deltaRay->SetKineticEnergy( deltaTkin ); // !!! trick for last steps /2.0 ??? |
---|
| 600 | deltaRay->SetMomentumDirection(deltaDirection); |
---|
| 601 | |
---|
| 602 | vdp->push_back(deltaRay); |
---|
| 603 | } |
---|
| 604 | |
---|
| 605 | |
---|
| 606 | /////////////////////////////////////////////////////////////////////// |
---|
| 607 | // |
---|
| 608 | // Returns post step PAI energy transfer > cut electron energy according to passed |
---|
| 609 | // scaled kinetic energy of particle |
---|
| 610 | |
---|
| 611 | G4double |
---|
| 612 | G4PAIModel::GetPostStepTransfer( G4double scaledTkin ) |
---|
| 613 | { |
---|
| 614 | // G4cout<<"G4PAIModel::GetPostStepTransfer"<<G4endl ; |
---|
| 615 | |
---|
| 616 | G4int iTkin, iTransfer, iPlace ; |
---|
| 617 | G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ; |
---|
| 618 | |
---|
| 619 | for(iTkin=0;iTkin<fTotBin;iTkin++) |
---|
| 620 | { |
---|
| 621 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 622 | } |
---|
| 623 | iPlace = iTkin - 1 ; |
---|
| 624 | // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ; |
---|
| 625 | if(iPlace < 0) iPlace = 0; |
---|
| 626 | dNdxCut1 = (*fdNdxCutVector)(iPlace) ; |
---|
| 627 | // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ; |
---|
| 628 | |
---|
| 629 | |
---|
| 630 | if(iTkin == fTotBin) // Fermi plato, try from left |
---|
| 631 | { |
---|
| 632 | position = dNdxCut1*G4UniformRand() ; |
---|
| 633 | |
---|
| 634 | for( iTransfer = 0; |
---|
| 635 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
| 636 | { |
---|
| 637 | if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ; |
---|
| 638 | } |
---|
| 639 | transfer = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 640 | } |
---|
| 641 | else |
---|
| 642 | { |
---|
| 643 | dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; |
---|
| 644 | // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ; |
---|
| 645 | if(iTkin == 0) // Tkin is too small, trying from right only |
---|
| 646 | { |
---|
| 647 | position = dNdxCut2*G4UniformRand() ; |
---|
| 648 | |
---|
| 649 | for( iTransfer = 0; |
---|
| 650 | iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ ) |
---|
| 651 | { |
---|
| 652 | if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ; |
---|
| 653 | } |
---|
| 654 | transfer = GetEnergyTransfer(iPlace+1,position,iTransfer); |
---|
| 655 | } |
---|
| 656 | else // general case: Tkin between two vectors of the material |
---|
| 657 | { |
---|
| 658 | E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; |
---|
| 659 | E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin) ; |
---|
| 660 | W = 1.0/(E2 - E1) ; |
---|
| 661 | W1 = (E2 - scaledTkin)*W ; |
---|
| 662 | W2 = (scaledTkin - E1)*W ; |
---|
| 663 | |
---|
| 664 | position = ( dNdxCut1*W1 + dNdxCut2*W2 )*G4UniformRand() ; |
---|
| 665 | |
---|
| 666 | // G4cout<<position<<"\t" ; |
---|
| 667 | |
---|
| 668 | G4int iTrMax1, iTrMax2, iTrMax; |
---|
| 669 | |
---|
| 670 | iTrMax1 = G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); |
---|
| 671 | iTrMax2 = G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); |
---|
| 672 | |
---|
| 673 | if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2; |
---|
| 674 | else iTrMax = iTrMax1; |
---|
| 675 | |
---|
| 676 | |
---|
| 677 | for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ ) |
---|
| 678 | { |
---|
| 679 | if( position >= |
---|
| 680 | ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + |
---|
| 681 | (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) break ; |
---|
| 682 | } |
---|
| 683 | transfer = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 684 | } |
---|
| 685 | } |
---|
| 686 | // G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ; |
---|
| 687 | if(transfer < 0.0 ) transfer = 0.0 ; |
---|
| 688 | // if(transfer < DBL_MIN ) transfer = DBL_MIN; |
---|
| 689 | |
---|
| 690 | return transfer ; |
---|
| 691 | } |
---|
| 692 | |
---|
| 693 | /////////////////////////////////////////////////////////////////////// |
---|
| 694 | // |
---|
| 695 | // Returns random PAI energy transfer according to passed |
---|
| 696 | // indexes of particle kinetic |
---|
| 697 | |
---|
| 698 | G4double |
---|
| 699 | G4PAIModel::GetEnergyTransfer( G4int iPlace, G4double position, G4int iTransfer ) |
---|
| 700 | { |
---|
| 701 | G4int iTransferMax; |
---|
| 702 | G4double x1, x2, y1, y2, energyTransfer; |
---|
| 703 | |
---|
| 704 | if(iTransfer == 0) |
---|
| 705 | { |
---|
| 706 | energyTransfer = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer); |
---|
| 707 | } |
---|
| 708 | else |
---|
| 709 | { |
---|
| 710 | iTransferMax = G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); |
---|
| 711 | |
---|
| 712 | if ( iTransfer >= iTransferMax ) iTransfer = iTransferMax - 1; |
---|
| 713 | |
---|
| 714 | y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1); |
---|
| 715 | y2 = (*(*fPAItransferTable)(iPlace))(iTransfer); |
---|
| 716 | |
---|
| 717 | x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1); |
---|
| 718 | x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer); |
---|
| 719 | |
---|
| 720 | if ( x1 == x2 ) energyTransfer = x2; |
---|
| 721 | else |
---|
| 722 | { |
---|
| 723 | if ( y1 == y2 ) energyTransfer = x1 + (x2 - x1)*G4UniformRand(); |
---|
| 724 | else |
---|
| 725 | { |
---|
| 726 | energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1); |
---|
| 727 | } |
---|
| 728 | } |
---|
| 729 | } |
---|
| 730 | return energyTransfer; |
---|
| 731 | } |
---|
| 732 | |
---|
| 733 | /////////////////////////////////////////////////////////////////////// |
---|
| 734 | |
---|
| 735 | G4double G4PAIModel::SampleFluctuations( const G4Material* material, |
---|
| 736 | const G4DynamicParticle* aParticle, |
---|
| 737 | G4double&, |
---|
| 738 | G4double& step, |
---|
| 739 | G4double&) |
---|
| 740 | { |
---|
| 741 | size_t jMat; |
---|
| 742 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
| 743 | { |
---|
| 744 | if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break; |
---|
| 745 | } |
---|
| 746 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
| 747 | |
---|
| 748 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
| 749 | fdNdxCutVector = fdNdxCutTable[jMat]; |
---|
| 750 | |
---|
| 751 | G4int iTkin, iTransfer, iPlace ; |
---|
| 752 | G4long numOfCollisions=0; |
---|
| 753 | |
---|
| 754 | // G4cout<<"G4PAIModel::SampleFluctuations"<<G4endl ; |
---|
| 755 | //G4cout<<"in: "<<fMaterialCutsCoupleVector[jMat]->GetMaterial()->GetName()<<G4endl ; |
---|
| 756 | |
---|
| 757 | G4double loss = 0.0, charge2 ; |
---|
| 758 | G4double stepSum = 0., stepDelta, lambda, omega; |
---|
| 759 | G4double position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber; |
---|
| 760 | G4bool numb = true; |
---|
| 761 | G4double Tkin = aParticle->GetKineticEnergy() ; |
---|
| 762 | G4double MassRatio = fMass/aParticle->GetDefinition()->GetPDGMass() ; |
---|
| 763 | G4double charge = aParticle->GetDefinition()->GetPDGCharge() ; |
---|
| 764 | charge2 = charge*charge ; |
---|
| 765 | G4double TkinScaled = Tkin*MassRatio ; |
---|
| 766 | |
---|
| 767 | for(iTkin=0;iTkin<fTotBin;iTkin++) |
---|
| 768 | { |
---|
| 769 | if(TkinScaled < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
| 770 | } |
---|
| 771 | iPlace = iTkin - 1 ; |
---|
| 772 | if(iPlace < 0) iPlace = 0; |
---|
| 773 | // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ; |
---|
| 774 | dNdxCut1 = (*fdNdxCutVector)(iPlace) ; |
---|
| 775 | // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ; |
---|
| 776 | |
---|
| 777 | |
---|
| 778 | if(iTkin == fTotBin) // Fermi plato, try from left |
---|
| 779 | { |
---|
| 780 | meanNumber =((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*step*charge2; |
---|
| 781 | if(meanNumber < 0.) meanNumber = 0. ; |
---|
| 782 | // numOfCollisions = RandPoisson::shoot(meanNumber) ; |
---|
| 783 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
| 784 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
| 785 | else lambda = DBL_MAX; |
---|
| 786 | while(numb) |
---|
| 787 | { |
---|
| 788 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
| 789 | stepSum += stepDelta; |
---|
| 790 | if(stepSum >= step) break; |
---|
| 791 | numOfCollisions++; |
---|
| 792 | } |
---|
| 793 | // G4cout<<"##1 numOfCollisions = "<<numOfCollisions<<G4endl ; |
---|
| 794 | |
---|
| 795 | while(numOfCollisions) |
---|
| 796 | { |
---|
| 797 | position = dNdxCut1+ |
---|
| 798 | ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*G4UniformRand() ; |
---|
| 799 | |
---|
| 800 | for( iTransfer = 0; |
---|
| 801 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
| 802 | { |
---|
| 803 | if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ; |
---|
| 804 | } |
---|
| 805 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 806 | // G4cout<<"G4PAIModel::SampleFluctuations, omega = "<<omega/keV<<" keV; "<<"\t"; |
---|
| 807 | loss += omega; |
---|
| 808 | numOfCollisions-- ; |
---|
| 809 | } |
---|
| 810 | } |
---|
| 811 | else |
---|
| 812 | { |
---|
| 813 | dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; |
---|
| 814 | // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ; |
---|
| 815 | |
---|
| 816 | if(iTkin == 0) // Tkin is too small, trying from right only |
---|
| 817 | { |
---|
| 818 | meanNumber =((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*step*charge2; |
---|
| 819 | if( meanNumber < 0. ) meanNumber = 0. ; |
---|
| 820 | // numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ; |
---|
| 821 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
| 822 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
| 823 | else lambda = DBL_MAX; |
---|
| 824 | while(numb) |
---|
| 825 | { |
---|
| 826 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
| 827 | stepSum += stepDelta; |
---|
| 828 | if(stepSum >= step) break; |
---|
| 829 | numOfCollisions++; |
---|
| 830 | } |
---|
| 831 | |
---|
| 832 | //G4cout<<"##2 numOfCollisions = "<<numOfCollisions<<G4endl ; |
---|
| 833 | |
---|
| 834 | while(numOfCollisions) |
---|
| 835 | { |
---|
| 836 | position = dNdxCut2+ |
---|
| 837 | ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*G4UniformRand(); |
---|
| 838 | |
---|
| 839 | for( iTransfer = 0; |
---|
| 840 | iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ ) |
---|
| 841 | { |
---|
| 842 | if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ; |
---|
| 843 | } |
---|
| 844 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 845 | // G4cout<<omega/keV<<"\t"; |
---|
| 846 | loss += omega; |
---|
| 847 | numOfCollisions-- ; |
---|
| 848 | } |
---|
| 849 | } |
---|
| 850 | else // general case: Tkin between two vectors of the material |
---|
| 851 | { |
---|
| 852 | E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; |
---|
| 853 | E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin) ; |
---|
| 854 | W = 1.0/(E2 - E1) ; |
---|
| 855 | W1 = (E2 - TkinScaled)*W ; |
---|
| 856 | W2 = (TkinScaled - E1)*W ; |
---|
| 857 | |
---|
| 858 | // G4cout<<"(*(*fPAItransferTable)(iPlace))(0) = "<< |
---|
| 859 | // (*(*fPAItransferTable)(iPlace))(0)<<G4endl ; |
---|
| 860 | // G4cout<<"(*(*fPAItransferTable)(iPlace+1))(0) = "<< |
---|
| 861 | // (*(*fPAItransferTable)(iPlace+1))(0)<<G4endl ; |
---|
| 862 | |
---|
| 863 | meanNumber=( ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*W1 + |
---|
| 864 | ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*W2 )*step*charge2; |
---|
| 865 | if(meanNumber<0.0) meanNumber = 0.0; |
---|
| 866 | // numOfCollisions = RandPoisson::shoot(meanNumber) ; |
---|
| 867 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
| 868 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
| 869 | else lambda = DBL_MAX; |
---|
| 870 | while(numb) |
---|
| 871 | { |
---|
| 872 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
| 873 | stepSum += stepDelta; |
---|
| 874 | if(stepSum >= step) break; |
---|
| 875 | numOfCollisions++; |
---|
| 876 | } |
---|
| 877 | |
---|
| 878 | //G4cout<<"##3 numOfCollisions = "<<numOfCollisions<<endl ; |
---|
| 879 | |
---|
| 880 | while(numOfCollisions) |
---|
| 881 | { |
---|
| 882 | position = dNdxCut1*W1 + dNdxCut2*W2 + |
---|
| 883 | ( ( (*(*fPAItransferTable)(iPlace))(0)-dNdxCut1 )*W1 + |
---|
| 884 | dNdxCut2+ |
---|
| 885 | ( (*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2 )*W2 )*G4UniformRand(); |
---|
| 886 | |
---|
| 887 | // G4cout<<position<<"\t" ; |
---|
| 888 | |
---|
| 889 | for( iTransfer = 0; |
---|
| 890 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
| 891 | { |
---|
| 892 | if( position >= |
---|
| 893 | ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + |
---|
| 894 | (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) |
---|
| 895 | { |
---|
| 896 | break ; |
---|
| 897 | } |
---|
| 898 | } |
---|
| 899 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
| 900 | // G4cout<<omega/keV<<"\t"; |
---|
| 901 | loss += omega; |
---|
| 902 | numOfCollisions-- ; |
---|
| 903 | } |
---|
| 904 | } |
---|
| 905 | } |
---|
| 906 | // G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = " |
---|
| 907 | // <<step/mm<<" mm"<<G4endl ; |
---|
| 908 | if(loss > Tkin) loss=Tkin; |
---|
| 909 | if(loss < 0. ) loss = 0.; |
---|
| 910 | return loss ; |
---|
| 911 | |
---|
| 912 | } |
---|
| 913 | |
---|
| 914 | ////////////////////////////////////////////////////////////////////// |
---|
| 915 | // |
---|
| 916 | // Returns the statistical estimation of the energy loss distribution variance |
---|
| 917 | // |
---|
| 918 | |
---|
| 919 | |
---|
| 920 | G4double G4PAIModel::Dispersion( const G4Material* material, |
---|
| 921 | const G4DynamicParticle* aParticle, |
---|
| 922 | G4double& tmax, |
---|
| 923 | G4double& step ) |
---|
| 924 | { |
---|
| 925 | G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.; |
---|
| 926 | for(G4int i = 0 ; i < fMeanNumber; i++) |
---|
| 927 | { |
---|
| 928 | loss = SampleFluctuations(material,aParticle,tmax,step,meanLoss); |
---|
| 929 | sumLoss += loss; |
---|
| 930 | sumLoss2 += loss*loss; |
---|
| 931 | } |
---|
| 932 | meanLoss = sumLoss/fMeanNumber; |
---|
| 933 | sigma2 = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber; |
---|
| 934 | return sigma2; |
---|
| 935 | } |
---|
| 936 | |
---|
| 937 | |
---|
| 938 | // |
---|
| 939 | // |
---|
| 940 | ///////////////////////////////////////////////// |
---|
| 941 | |
---|
| 942 | |
---|
| 943 | |
---|
| 944 | |
---|
| 945 | |
---|
| 946 | |
---|