Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/electromagnetic/standard/include/G4IonFluctuations.hh

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 25 //
 26 //
 27 // -------------------------------------------------------------------
 28 //
 29 // GEANT4 Class header file
 30 //
 31 //
 32 // File name:     G4IonFluctuations
 33 //
 34 // Author:        Vladimir Ivanchenko
 35 //
 36 // Creation date: 02.04.2003
 37 //
 38 // Modifications: 
 39 //
 40 // 16-10-03 Changed interface to Initialisation (V.Ivanchenko)
 41 // 01-06-08 Added initialisation of effective charge prestep (V.Ivanchenko)
 42 //
 43 // Class Description:
 44 //
 45 // Implementation of ion energy loss fluctuations
 46 
 47 // -------------------------------------------------------------------
 48 //
 49 
 50 #ifndef G4IonFluctuations_h
 51 #define G4IonFluctuations_h 1
 52 
 53 #include "G4VEmFluctuationModel.hh"
 54 #include "G4ParticleDefinition.hh"
 55 
 56 class G4Pow;
 57 class G4UniversalFluctuation;
 58 
 59 class G4IonFluctuations : public G4VEmFluctuationModel
 60 {
 61 
 62 public:
 63 
 64   explicit G4IonFluctuations(const G4String& nam = "IonFluc");
 65 
 66   ~G4IonFluctuations() override;
 67 
 68   // Sample fluctuations
 69   G4double SampleFluctuations(const G4MaterialCutsCouple*,
 70             const G4DynamicParticle*,
 71             const G4double tcut,
 72             const G4double tmax,
 73             const G4double length,
 74             const G4double meanLoss) override;
 75 
 76   // Compute dispertion 
 77   G4double Dispersion(const G4Material*,
 78           const G4DynamicParticle*,
 79                       const G4double tcut,
 80           const G4double tmax,
 81           const G4double length) override;
 82 
 83   // Initialisation prerun
 84   void InitialiseMe(const G4ParticleDefinition*) override;
 85 
 86   // Initialisation prestep
 87   void SetParticleAndCharge(const G4ParticleDefinition*, 
 88           G4double q2) override;
 89 
 90   // hide assignment operator
 91   G4IonFluctuations & operator=(const  G4IonFluctuations &right) = delete;
 92   G4IonFluctuations(const  G4IonFluctuations&) = delete;
 93 
 94 private:
 95 
 96   G4double Factor(const G4Material*, G4double Zeff);
 97   G4double RelativisticFactor(const G4Material*, G4double Zeff);
 98 
 99   const G4ParticleDefinition* particle = nullptr;
100   G4UniversalFluctuation* uniFluct;
101   G4Pow* g4calc; 
102 
103   G4double particleMass;
104   G4double charge = 1.0;
105   G4double chargeSquare = 1.0;
106   G4double effChargeSquare = 1.0;
107 
108   // data members to speed up the fluctuation calculation
109   G4double parameter;
110   G4double theBohrBeta2;
111   G4double minFraction = 0.2;
112   G4double xmin = 0.2;
113   G4double minLoss;
114   // cash
115   G4double kineticEnergy = 0.0;
116   G4double beta2 = 0.0;
117 };
118 
119 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
120 
121 #endif
122 
123