[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: G4eBremsstrahlungModel.hh,v 1.22 2007/05/23 08:47:34 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: $ |
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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: G4eBremsstrahlungModel |
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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: 07.01.2002 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko) |
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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 | // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko) |
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| 46 | // 07-02-06 public function ComputeCrossSectionPerAtom() (mma) |
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| 47 | // |
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| 48 | // |
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| 49 | // Class Description: |
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| 50 | // |
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| 51 | // Implementation of energy loss for gamma emission by electrons and |
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| 52 | // positrons |
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| 53 | |
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| 54 | // ------------------------------------------------------------------- |
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| 55 | // |
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| 56 | |
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| 57 | #ifndef G4eBremsstrahlungModel_h |
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| 58 | #define G4eBremsstrahlungModel_h 1 |
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| 59 | |
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| 60 | #include "G4VEmModel.hh" |
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| 61 | |
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| 62 | class G4Element; |
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| 63 | class G4ParticleChangeForLoss; |
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| 64 | |
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| 65 | class G4eBremsstrahlungModel : public G4VEmModel |
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| 66 | { |
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| 67 | |
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| 68 | public: |
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| 69 | |
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| 70 | G4eBremsstrahlungModel(const G4ParticleDefinition* p = 0, |
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| 71 | const G4String& nam = "StandBrem"); |
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| 72 | |
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| 73 | virtual ~G4eBremsstrahlungModel(); |
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| 74 | |
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| 75 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
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| 76 | |
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| 77 | G4double MinEnergyCut(const G4ParticleDefinition*, |
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| 78 | const G4MaterialCutsCouple*); |
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| 79 | |
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| 80 | virtual G4double ComputeDEDXPerVolume(const G4Material*, |
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| 81 | const G4ParticleDefinition*, |
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| 82 | G4double kineticEnergy, |
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| 83 | G4double cutEnergy); |
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| 84 | |
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| 85 | virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*, |
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| 86 | G4double tkin, |
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| 87 | G4double Z, G4double, |
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| 88 | G4double cut, |
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| 89 | G4double maxE = DBL_MAX); |
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| 90 | |
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| 91 | virtual G4double CrossSectionPerVolume(const G4Material*, |
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| 92 | const G4ParticleDefinition*, |
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| 93 | G4double kineticEnergy, |
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| 94 | G4double cutEnergy, |
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| 95 | G4double maxEnergy); |
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| 96 | |
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| 97 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
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| 98 | const G4MaterialCutsCouple*, |
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| 99 | const G4DynamicParticle*, |
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| 100 | G4double tmin, |
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| 101 | G4double maxEnergy); |
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| 102 | |
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| 103 | inline void SetLPMflag(G4bool val); |
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| 104 | inline G4bool LPMflag() const; |
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| 105 | |
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| 106 | inline void SetEnergyThreshold(G4double val); |
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| 107 | inline G4double EnergyThreshold() const; |
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| 108 | |
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| 109 | protected: |
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| 110 | |
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| 111 | inline G4double MaxSecondaryEnergy(const G4ParticleDefinition*, |
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| 112 | G4double kineticEnergy); |
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| 113 | |
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| 114 | const G4Element* SelectRandomAtom(const G4MaterialCutsCouple* couple); |
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| 115 | |
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| 116 | private: |
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| 117 | |
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| 118 | void SetParticle(const G4ParticleDefinition* p); |
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| 119 | |
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| 120 | G4double ComputeBremLoss(G4double Z, G4double tkin, G4double cut); |
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| 121 | |
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| 122 | G4double PositronCorrFactorLoss(G4double Z, G4double tkin, G4double cut); |
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| 123 | |
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| 124 | G4double PositronCorrFactorSigma(G4double Z, G4double tkin, G4double cut); |
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| 125 | |
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| 126 | G4DataVector* ComputePartialSumSigma(const G4Material* material, |
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| 127 | G4double tkin, G4double cut); |
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| 128 | |
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| 129 | G4double SupressionFunction(const G4Material* material, G4double tkin, |
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| 130 | G4double gammaEnergy); |
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| 131 | |
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| 132 | inline G4double ScreenFunction1(G4double ScreenVariable); |
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| 133 | |
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| 134 | inline G4double ScreenFunction2(G4double ScreenVariable); |
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| 135 | |
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| 136 | // hide assignment operator |
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| 137 | G4eBremsstrahlungModel & operator=(const G4eBremsstrahlungModel &right); |
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| 138 | G4eBremsstrahlungModel(const G4eBremsstrahlungModel&); |
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| 139 | |
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| 140 | protected: |
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| 141 | |
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| 142 | const G4ParticleDefinition* particle; |
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| 143 | G4ParticleDefinition* theGamma; |
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| 144 | G4ParticleChangeForLoss* fParticleChange; |
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| 145 | |
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| 146 | G4double minThreshold; |
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| 147 | G4bool isElectron; |
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| 148 | |
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| 149 | private: |
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| 150 | |
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| 151 | G4double highKinEnergy; |
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| 152 | G4double lowKinEnergy; |
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| 153 | G4double probsup; |
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| 154 | G4double MigdalConstant; |
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| 155 | G4double LPMconstant; |
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| 156 | G4double highEnergyTh; |
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| 157 | G4bool theLPMflag; |
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| 158 | G4bool isInitialised; |
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| 159 | |
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| 160 | std::vector<G4DataVector*> partialSumSigma; |
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| 161 | |
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| 162 | }; |
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| 163 | |
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| 164 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 165 | |
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| 166 | inline G4double G4eBremsstrahlungModel::ScreenFunction1(G4double ScreenVariable) |
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| 167 | |
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| 168 | // compute the value of the screening function 3*PHI1 - PHI2 |
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| 169 | |
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| 170 | { |
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| 171 | G4double screenVal; |
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| 172 | |
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| 173 | if (ScreenVariable > 1.) |
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| 174 | screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952); |
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| 175 | else |
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| 176 | screenVal = 42.392 - ScreenVariable* (7.796 - 1.961*ScreenVariable); |
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| 177 | |
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| 178 | return screenVal; |
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| 179 | } |
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| 180 | |
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| 181 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 182 | |
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| 183 | inline |
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| 184 | G4double G4eBremsstrahlungModel::ScreenFunction2(G4double ScreenVariable) |
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| 185 | |
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| 186 | // compute the value of the screening function 1.5*PHI1 - 0.5*PHI2 |
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| 187 | |
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| 188 | { |
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| 189 | G4double screenVal; |
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| 190 | |
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| 191 | if (ScreenVariable > 1.) |
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| 192 | screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952); |
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| 193 | else |
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| 194 | screenVal = 41.734 - ScreenVariable* (6.484 - 1.250*ScreenVariable); |
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| 195 | |
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| 196 | return screenVal; |
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| 197 | } |
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| 198 | |
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| 199 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 200 | |
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| 201 | inline |
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| 202 | G4double G4eBremsstrahlungModel::MaxSecondaryEnergy( |
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| 203 | const G4ParticleDefinition*, |
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| 204 | G4double kineticEnergy) |
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| 205 | { |
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| 206 | return kineticEnergy; |
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| 207 | } |
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| 208 | |
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| 209 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 210 | |
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| 211 | inline |
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| 212 | void G4eBremsstrahlungModel::SetLPMflag(G4bool val) |
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| 213 | { |
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| 214 | theLPMflag = val; |
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| 215 | } |
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| 216 | |
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| 217 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 218 | |
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| 219 | inline |
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| 220 | G4bool G4eBremsstrahlungModel::LPMflag() const |
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| 221 | { |
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| 222 | return theLPMflag; |
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| 223 | } |
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| 224 | |
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| 225 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 226 | |
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| 227 | inline |
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| 228 | void G4eBremsstrahlungModel::SetEnergyThreshold(G4double val) |
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| 229 | { |
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| 230 | highEnergyTh = val; |
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| 231 | } |
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| 232 | |
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| 233 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 234 | |
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| 235 | inline |
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| 236 | G4double G4eBremsstrahlungModel::EnergyThreshold() const |
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| 237 | { |
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| 238 | return highEnergyTh; |
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| 239 | } |
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| 240 | |
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| 241 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 242 | |
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| 243 | #endif |
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