| 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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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: G4BohrFluctuations.hh,v 1.3 2007/09/27 13:53:11 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-02 $ |
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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: G4BohrFluctuations |
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| 35 | // |
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| 36 | // Author: Vladimir Ivanchenko |
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| 37 | // |
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| 38 | // Creation date: 02.04.2003 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // 16-10-03 Changed interface to Initialisation (V.Ivanchenko) |
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| 43 | // |
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| 44 | // Class Description: |
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| 45 | // |
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| 46 | // Implementation of Gaussion energy loss Fluctuations |
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| 47 | |
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| 48 | // ------------------------------------------------------------------- |
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| 49 | // |
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| 50 | |
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| 51 | #ifndef G4BohrFluctuations_h |
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| 52 | #define G4BohrFluctuations_h 1 |
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| 53 | |
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| 54 | |
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| 55 | #include "G4VEmFluctuationModel.hh" |
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| 56 | #include "G4Material.hh" |
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| 57 | #include "G4DynamicParticle.hh" |
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| 58 | |
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| 59 | class G4BohrFluctuations : public G4VEmFluctuationModel |
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| 60 | { |
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| 61 | |
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| 62 | public: |
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| 63 | |
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| 64 | G4BohrFluctuations(const G4String& nam = "BohrFluc"); |
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| 65 | |
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| 66 | virtual ~G4BohrFluctuations(); |
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| 67 | |
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| 68 | G4double SampleFluctuations(const G4Material*, |
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| 69 | const G4DynamicParticle*, |
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| 70 | G4double&, |
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| 71 | G4double&, |
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| 72 | G4double&); |
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| 73 | |
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| 74 | G4double Dispersion( const G4Material*, |
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| 75 | const G4DynamicParticle*, |
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| 76 | G4double&, |
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| 77 | G4double&); |
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| 78 | |
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| 79 | void InitialiseMe(const G4ParticleDefinition*); |
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| 80 | |
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| 81 | protected: |
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| 82 | |
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| 83 | private: |
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| 84 | |
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| 85 | // hide assignment operator |
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| 86 | G4BohrFluctuations & operator=(const G4BohrFluctuations &right); |
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| 87 | G4BohrFluctuations(const G4BohrFluctuations&); |
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| 88 | |
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| 89 | const G4ParticleDefinition* particle; |
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| 90 | |
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| 91 | G4double particleMass; |
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| 92 | G4double chargeSquare; |
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| 93 | |
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| 94 | G4double minNumberInteractionsBohr; |
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| 95 | G4double minFraction; |
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| 96 | G4double xmin; |
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| 97 | G4double minLoss; |
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| 98 | // cash |
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| 99 | G4double kineticEnergy; |
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| 100 | G4double beta2; |
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| 101 | }; |
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| 102 | |
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| 103 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 104 | |
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| 105 | |
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| 106 | inline G4double G4BohrFluctuations::Dispersion( |
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| 107 | const G4Material* material, |
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| 108 | const G4DynamicParticle* dp, |
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| 109 | G4double& tmax, |
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| 110 | G4double& length) |
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| 111 | { |
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| 112 | if(!particle) InitialiseMe(dp->GetDefinition()); |
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| 113 | |
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| 114 | G4double electronDensity = material->GetElectronDensity(); |
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| 115 | kineticEnergy = dp->GetKineticEnergy(); |
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| 116 | G4double etot = kineticEnergy + particleMass; |
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| 117 | beta2 = kineticEnergy*(kineticEnergy + 2.0*particleMass)/(etot*etot); |
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| 118 | G4double siga = (1.0/beta2 - 0.5) * twopi_mc2_rcl2 * tmax * length |
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| 119 | * electronDensity * chargeSquare; |
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| 120 | |
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| 121 | return siga; |
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| 122 | } |
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| 123 | |
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| 124 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 125 | |
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| 126 | #endif |
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| 127 | |
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