[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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[1055] | 26 | // $Id: G4BetheBlochModel.hh,v 1.20 2009/04/23 17:44:43 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03-beta-cand-01 $ |
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[819] | 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: G4BetheBlochModel |
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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: 03.01.2002 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // 23-12-02 V.Ivanchenko change interface in order to moveto cut per region |
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| 43 | // 24-01-03 Make models region aware (V.Ivanchenko) |
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| 44 | // 13-02-03 Add name (V.Ivanchenko) |
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| 45 | // 12-11-03 Fix for GenericIons (V.Ivanchenko) |
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| 46 | // 24-03-05 Add G4EmCorrections (V.Ivanchenko) |
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[961] | 47 | // 11-04-05 Major optimisation of internal interfaces (V.Ivanchenko) |
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[819] | 48 | // 11-04-04 Move MaxSecondaryEnergy to models (V.Ivanchenko) |
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| 49 | // 11-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma) |
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[961] | 50 | // 12-08-08 Added methods GetParticleCharge, GetChargeSquareRatio, |
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| 51 | // CorrectionsAlongStep needed for ions(V.Ivanchenko) |
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[819] | 52 | |
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| 53 | // |
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| 54 | // Class Description: |
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| 55 | // |
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| 56 | // Implementation of Bethe-Bloch model of energy loss and |
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| 57 | // delta-electron production by heavy charged particles |
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| 58 | |
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| 59 | // ------------------------------------------------------------------- |
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| 60 | // |
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| 61 | |
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| 62 | #ifndef G4BetheBlochModel_h |
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| 63 | #define G4BetheBlochModel_h 1 |
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| 64 | |
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| 65 | #include "G4VEmModel.hh" |
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[1055] | 66 | #include "G4NistManager.hh" |
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[819] | 67 | |
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| 68 | class G4EmCorrections; |
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| 69 | class G4ParticleChangeForLoss; |
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| 70 | |
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| 71 | class G4BetheBlochModel : public G4VEmModel |
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| 72 | { |
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| 73 | |
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| 74 | public: |
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| 75 | |
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| 76 | G4BetheBlochModel(const G4ParticleDefinition* p = 0, |
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| 77 | const G4String& nam = "BetheBloch"); |
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| 78 | |
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| 79 | virtual ~G4BetheBlochModel(); |
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| 80 | |
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| 81 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
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| 82 | |
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[1055] | 83 | virtual G4double MinEnergyCut(const G4ParticleDefinition*, |
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| 84 | const G4MaterialCutsCouple*); |
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[819] | 85 | |
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| 86 | virtual G4double ComputeCrossSectionPerElectron( |
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| 87 | const G4ParticleDefinition*, |
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| 88 | G4double kineticEnergy, |
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| 89 | G4double cutEnergy, |
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| 90 | G4double maxEnergy); |
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| 91 | |
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| 92 | virtual G4double ComputeCrossSectionPerAtom( |
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| 93 | const G4ParticleDefinition*, |
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| 94 | G4double kineticEnergy, |
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| 95 | G4double Z, G4double A, |
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| 96 | G4double cutEnergy, |
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| 97 | G4double maxEnergy); |
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| 98 | |
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| 99 | virtual G4double CrossSectionPerVolume(const G4Material*, |
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| 100 | const G4ParticleDefinition*, |
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| 101 | G4double kineticEnergy, |
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| 102 | G4double cutEnergy, |
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| 103 | G4double maxEnergy); |
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| 104 | |
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| 105 | virtual G4double ComputeDEDXPerVolume(const G4Material*, |
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| 106 | const G4ParticleDefinition*, |
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| 107 | G4double kineticEnergy, |
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| 108 | G4double cutEnergy); |
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| 109 | |
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[961] | 110 | virtual G4double GetChargeSquareRatio(const G4ParticleDefinition* p, |
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| 111 | const G4Material* mat, |
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| 112 | G4double kineticEnergy); |
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| 113 | |
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| 114 | virtual G4double GetParticleCharge(const G4ParticleDefinition* p, |
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| 115 | const G4Material* mat, |
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| 116 | G4double kineticEnergy); |
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| 117 | |
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| 118 | virtual void CorrectionsAlongStep(const G4MaterialCutsCouple*, |
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| 119 | const G4DynamicParticle*, |
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| 120 | G4double& eloss, |
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| 121 | G4double& niel, |
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| 122 | G4double length); |
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| 123 | |
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[819] | 124 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
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| 125 | const G4MaterialCutsCouple*, |
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| 126 | const G4DynamicParticle*, |
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| 127 | G4double tmin, |
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| 128 | G4double maxEnergy); |
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| 129 | |
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| 130 | protected: |
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| 131 | |
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[1055] | 132 | virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*, |
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| 133 | G4double kinEnergy); |
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[819] | 134 | |
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| 135 | private: |
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| 136 | |
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[1055] | 137 | inline void SetupParameters(); |
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[819] | 138 | |
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[1055] | 139 | inline void SetParticle(const G4ParticleDefinition* p); |
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| 140 | |
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| 141 | inline void SetGenericIon(const G4ParticleDefinition* p); |
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| 142 | |
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[819] | 143 | // hide assignment operator |
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| 144 | G4BetheBlochModel & operator=(const G4BetheBlochModel &right); |
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| 145 | G4BetheBlochModel(const G4BetheBlochModel&); |
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| 146 | |
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| 147 | const G4ParticleDefinition* particle; |
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[961] | 148 | const G4Material* currentMaterial; |
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[819] | 149 | G4ParticleDefinition* theElectron; |
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| 150 | G4EmCorrections* corr; |
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| 151 | G4ParticleChangeForLoss* fParticleChange; |
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[961] | 152 | G4NistManager* nist; |
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[819] | 153 | |
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| 154 | G4double mass; |
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| 155 | G4double tlimit; |
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| 156 | G4double spin; |
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[961] | 157 | G4double magMoment2; |
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[819] | 158 | G4double chargeSquare; |
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| 159 | G4double ratio; |
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[961] | 160 | G4double formfact; |
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[819] | 161 | G4double twoln10; |
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| 162 | G4double bg2lim; |
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| 163 | G4double taulim; |
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[961] | 164 | G4double corrFactor; |
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[819] | 165 | G4bool isIon; |
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[961] | 166 | G4bool isInitialised; |
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[819] | 167 | }; |
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| 168 | |
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| 169 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 170 | |
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[1055] | 171 | inline void G4BetheBlochModel::SetupParameters() |
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[1007] | 172 | { |
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[1055] | 173 | mass = particle->GetPDGMass(); |
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| 174 | spin = particle->GetPDGSpin(); |
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| 175 | G4double q = particle->GetPDGCharge()/eplus; |
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| 176 | chargeSquare = q*q; |
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| 177 | ratio = electron_mass_c2/mass; |
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| 178 | G4double magmom = particle->GetPDGMagneticMoment()*mass/(0.5*eplus*hbar_Planck*c_squared); |
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| 179 | magMoment2 = magmom*magmom - 1.0; |
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| 180 | formfact = 0.0; |
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| 181 | if(particle->GetLeptonNumber() == 0) { |
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| 182 | G4double x = 0.8426*GeV; |
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| 183 | if(spin == 0.0 && mass < GeV) {x = 0.736*GeV;} |
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| 184 | else if(mass > GeV) { |
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| 185 | x /= nist->GetZ13(mass/proton_mass_c2); |
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| 186 | // tlimit = 51.2*GeV*A13[iz]*A13[iz]; |
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| 187 | } |
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| 188 | formfact = 2.0*electron_mass_c2/(x*x); |
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| 189 | tlimit = 2.0/formfact; |
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| 190 | } |
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[1007] | 191 | } |
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| 192 | |
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| 193 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 194 | |
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[1055] | 195 | inline void G4BetheBlochModel::SetParticle(const G4ParticleDefinition* p) |
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| 196 | { |
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| 197 | if(particle != p) { |
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| 198 | particle = p; |
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| 199 | if (p->GetPDGCharge()/eplus > 1.5 && p->GetBaryonNumber() > 2) isIon = true; |
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| 200 | SetupParameters(); |
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| 201 | } |
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| 202 | } |
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| 203 | |
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| 204 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 205 | |
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| 206 | inline void G4BetheBlochModel::SetGenericIon(const G4ParticleDefinition* p) |
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| 207 | { |
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| 208 | if(p && particle != p) { |
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| 209 | if(p->GetParticleName() == "GenericIon") isIon = true; |
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| 210 | } |
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| 211 | } |
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| 212 | |
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[819] | 213 | #endif |
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