[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // $Id: G4MuPairProductionModel.hh,v 1.24 2007/10/11 13:52:03 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class header file |
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| 32 | // |
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| 33 | // |
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| 34 | // File name: G4MuPairProductionModel |
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| 35 | // |
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| 36 | // Author: Vladimir Ivanchenko on base of Laszlo Urban code |
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| 37 | // |
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| 38 | // Creation date: 18.05.2002 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko) |
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| 43 | // 27-01-03 Make models region aware (V.Ivanchenko) |
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| 44 | // 13-02-03 Add name (V.Ivanchenko) |
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| 45 | // 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko) |
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| 46 | // 10-02-04 Add lowestKinEnergy (V.Ivanchenko) |
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| 47 | // 13-02-06 Add ComputeCrossSectionPerAtom (mma) |
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| 48 | // 12-05-06 Add parameter to SelectRandomAtom (A.Bogdanov) |
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| 49 | // 11-10-07 Add ignoreCut flag (V.Ivanchenko) |
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| 50 | |
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| 51 | // |
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| 52 | // Class Description: |
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| 53 | // |
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| 54 | // Implementation of e+e- pair production by muons |
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| 55 | // |
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| 56 | |
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| 57 | // ------------------------------------------------------------------- |
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| 58 | // |
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| 59 | |
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| 60 | #ifndef G4MuPairProductionModel_h |
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| 61 | #define G4MuPairProductionModel_h 1 |
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| 62 | |
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| 63 | #include "G4VEmModel.hh" |
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| 64 | #include <vector> |
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| 65 | |
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| 66 | class G4Element; |
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| 67 | class G4ParticleChangeForLoss; |
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| 68 | class G4ParticleChangeForGamma; |
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| 69 | |
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| 70 | class G4MuPairProductionModel : public G4VEmModel |
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| 71 | { |
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| 72 | |
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| 73 | public: |
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| 74 | |
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| 75 | G4MuPairProductionModel(const G4ParticleDefinition* p = 0, |
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| 76 | const G4String& nam = "muPairProd"); |
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| 77 | |
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| 78 | virtual ~G4MuPairProductionModel(); |
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| 79 | |
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| 80 | void SetParticle(const G4ParticleDefinition*); |
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| 81 | |
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| 82 | void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
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| 83 | |
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| 84 | void SetLowestKineticEnergy(G4double e) {lowestKinEnergy = e;}; |
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| 85 | |
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| 86 | G4double MinEnergyCut(const G4ParticleDefinition*, |
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| 87 | const G4MaterialCutsCouple*); |
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| 88 | |
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| 89 | virtual G4double ComputeCrossSectionPerAtom( |
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| 90 | const G4ParticleDefinition*, |
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| 91 | G4double kineticEnergy, |
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| 92 | G4double Z, G4double A, |
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| 93 | G4double cutEnergy, |
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| 94 | G4double maxEnergy); |
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| 95 | |
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| 96 | virtual G4double CrossSectionPerVolume(const G4Material*, |
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| 97 | const G4ParticleDefinition*, |
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| 98 | G4double kineticEnergy, |
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| 99 | G4double cutEnergy, |
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| 100 | G4double maxEnergy); |
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| 101 | |
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| 102 | virtual G4double ComputeDEDXPerVolume(const G4Material*, |
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| 103 | const G4ParticleDefinition*, |
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| 104 | G4double kineticEnergy, |
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| 105 | G4double cutEnergy); |
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| 106 | |
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| 107 | void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
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| 108 | const G4MaterialCutsCouple*, |
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| 109 | const G4DynamicParticle*, |
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| 110 | G4double tmin, |
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| 111 | G4double maxEnergy); |
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| 112 | |
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| 113 | protected: |
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| 114 | |
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| 115 | inline G4double MaxSecondaryEnergy(const G4ParticleDefinition*, |
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| 116 | G4double kineticEnergy); |
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| 117 | |
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| 118 | |
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| 119 | public: |
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| 120 | |
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| 121 | G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut, |
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| 122 | G4double tmax); |
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| 123 | |
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| 124 | G4double ComputeMicroscopicCrossSection(G4double tkin, |
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| 125 | G4double Z, |
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| 126 | G4double cut); |
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| 127 | |
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| 128 | G4double ComputeDMicroscopicCrossSection(G4double tkin, |
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| 129 | G4double Z, |
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| 130 | G4double pairEnergy); |
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| 131 | |
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| 132 | inline void SetIgnoreCutFlag(G4bool); |
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| 133 | |
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| 134 | inline G4bool IgnoreCutFlag() const; |
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| 135 | |
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| 136 | private: |
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| 137 | |
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| 138 | const G4Element* SelectRandomAtom(G4double kinEnergy, |
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| 139 | G4double dt, |
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| 140 | G4int it, |
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| 141 | const G4MaterialCutsCouple* couple, |
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| 142 | G4double tmin); |
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| 143 | |
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| 144 | void MakeSamplingTables(); |
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| 145 | |
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| 146 | void SetCurrentElement(G4double Z); |
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| 147 | |
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| 148 | inline G4double InterpolatedIntegralCrossSection( |
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| 149 | G4double dt, G4double dz, G4int iz, |
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| 150 | G4int it, G4int iy, G4double z); |
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| 151 | |
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| 152 | // hide assignment operator |
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| 153 | G4MuPairProductionModel & operator=(const G4MuPairProductionModel &right); |
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| 154 | G4MuPairProductionModel(const G4MuPairProductionModel&); |
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| 155 | |
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| 156 | G4ParticleDefinition* theElectron; |
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| 157 | G4ParticleDefinition* thePositron; |
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| 158 | G4ParticleChangeForLoss* fParticleChange; |
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| 159 | G4ParticleChangeForGamma* gParticleChange; |
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| 160 | |
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| 161 | G4double minPairEnergy; |
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| 162 | G4double lowestKinEnergy; |
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| 163 | |
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| 164 | G4double factorForCross; |
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| 165 | G4double sqrte; |
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| 166 | G4double particleMass; |
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| 167 | G4double currentZ; |
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| 168 | G4double z13; |
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| 169 | G4double z23; |
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| 170 | G4double lnZ; |
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| 171 | |
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| 172 | const G4ParticleDefinition* particle; |
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| 173 | |
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| 174 | // tables for sampling |
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| 175 | G4int nzdat; |
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| 176 | G4int ntdat; |
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| 177 | G4int nbiny; |
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| 178 | size_t nmaxElements; |
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| 179 | static G4double zdat[5],adat[5],tdat[8],xgi[8],wgi[8]; |
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| 180 | G4double ya[1001],proba[5][8][1001]; |
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| 181 | |
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| 182 | G4double ymin; |
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| 183 | G4double ymax; |
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| 184 | G4double dy; |
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| 185 | |
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| 186 | G4bool ignoreCut; |
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| 187 | |
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| 188 | G4bool samplingTablesAreFilled; |
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| 189 | std::vector<G4double> partialSum; |
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| 190 | }; |
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| 191 | |
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| 192 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 193 | |
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| 194 | inline G4double G4MuPairProductionModel::MaxSecondaryEnergy( |
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| 195 | const G4ParticleDefinition*, |
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| 196 | G4double kineticEnergy) |
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| 197 | { |
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| 198 | G4double maxPairEnergy = kineticEnergy + particleMass*(1.0 - 0.75*sqrte*z13); |
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| 199 | return maxPairEnergy; |
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| 200 | } |
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| 201 | |
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| 202 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 203 | |
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| 204 | inline void G4MuPairProductionModel::SetCurrentElement(G4double Z) |
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| 205 | { |
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| 206 | if(Z != currentZ) { |
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| 207 | currentZ = Z; |
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| 208 | z13 = std::pow(Z,0.333333333); |
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| 209 | z23 = z13*z13; |
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| 210 | lnZ = std::log(Z); |
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| 211 | } |
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| 212 | } |
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| 213 | |
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| 214 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 215 | |
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| 216 | inline G4double G4MuPairProductionModel::InterpolatedIntegralCrossSection( |
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| 217 | G4double dt, G4double dz, |
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| 218 | G4int iz, G4int it, G4int iy, G4double z) |
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| 219 | { |
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| 220 | G4double fac = 1./(zdat[iz] *(zdat[iz] +1.)); |
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| 221 | G4double fac1 = 1./(zdat[iz-1]*(zdat[iz-1]+1.)); |
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| 222 | G4double f0 = fac1*proba[iz-1][it-1][iy] + |
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| 223 | (fac*proba[iz][it-1][iy]-fac1*proba[iz-1][it-1][iy])*dz; |
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| 224 | G4double f1 = fac1*proba[iz-1][it ][iy] + |
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| 225 | (fac*proba[iz][it ][iy]-fac1*proba[iz-1][it ][iy])*dz; |
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| 226 | return (f0 + (f1-f0)*dt)*z*(z+1.); |
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| 227 | } |
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| 228 | |
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| 229 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 230 | |
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| 231 | inline void G4MuPairProductionModel::SetIgnoreCutFlag(G4bool val) |
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| 232 | { |
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| 233 | ignoreCut = val; |
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| 234 | } |
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| 235 | |
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| 236 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 237 | |
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| 238 | inline G4bool G4MuPairProductionModel::IgnoreCutFlag() const |
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| 239 | { |
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| 240 | return ignoreCut; |
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| 241 | } |
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| 242 | |
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| 243 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 244 | |
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| 245 | #endif |
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