G4IonFluctuations.hh

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// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4IonFluctuations
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 02.04.2003
//
// Modifications: 
//
// 16-10-03 Changed interface to Initialisation (V.Ivanchenko)
// 01-06-08 Added initialisation of effective charge prestep (V.Ivanchenko)
//
// Class Description:
//
// Implementation of ion energy loss fluctuations
 
// -------------------------------------------------------------------
//
 
#ifndef G4IonFluctuations_h
#define G4IonFluctuations_h 1
 
#include "G4VEmFluctuationModel.hh"
#include "G4ParticleDefinition.hh"
 
class G4Pow;
class G4UniversalFluctuation;
 
class G4IonFluctuations : public G4VEmFluctuationModel
{
 
public:
 
  explicit G4IonFluctuations(const G4String& nam = "IonFluc");
 
  ~G4IonFluctuations() override;
 
  // Sample fluctuations
  G4double SampleFluctuations(const G4MaterialCutsCouple*,
                  const G4DynamicParticle*,
                  const G4double tcut,
                  const G4double tmax,
                  const G4double length,
                  const G4double meanLoss) override;
 
  // Compute dispertion 
  G4double Dispersion(const G4Material*,
              const G4DynamicParticle*,
                      const G4double tcut,
              const G4double tmax,
              const G4double length) override;
 
  // Initialisation prerun
  void InitialiseMe(const G4ParticleDefinition*) override;
 
  // Initialisation prestep
  void SetParticleAndCharge(const G4ParticleDefinition*, 
                G4double q2) override;
 
  // hide assignment operator
  G4IonFluctuations & operator=(const  G4IonFluctuations &right) = delete;
  G4IonFluctuations(const  G4IonFluctuations&) = delete;
 
private:
 
  G4double Factor(const G4Material*, G4double Zeff);
  G4double RelativisticFactor(const G4Material*, G4double Zeff);
 
  const G4ParticleDefinition* particle = nullptr;
  G4UniversalFluctuation* uniFluct;
  G4Pow* g4calc; 
 
  G4double particleMass;
  G4double charge = 1.0;
  G4double chargeSquare = 1.0;
  G4double effChargeSquare = 1.0;
 
  // data members to speed up the fluctuation calculation
  G4double parameter;
  G4double theBohrBeta2;
  G4double minFraction = 0.2;
  G4double xmin = 0.2;
  G4double minLoss;
  // cash
  G4double kineticEnergy = 0.0;
  G4double beta2 = 0.0;
};
 
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#endif