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//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4UniversalFluctuation
//
// Author:        Vladimir Ivanchenko
// 
// Creation date: 03.01.2002
//
// Modifications:
//
// 09-12-02 remove warnings (V.Ivanchenko)
// 28-12-02 add method Dispersion (V.Ivanchenko)
// 07-02-03 change signature (V.Ivanchenko)
// 13-02-03 Add name (V.Ivanchenko)
// Modified for standalone use in ORCA. d.k. 6/04
//
// Implementation of energy loss fluctuations
// -------------------------------------------------------------------
//

#ifndef LandauFP420_h
#define LandauFP420_h 

//#include "G4VEmFluctuationModel.hh"


class LandauFP420 {
public:

  LandauFP420();

  ~LandauFP420();

  // momentum in MeV/c, mass in MeV, tmax (delta cut) in MeV, 
  // length in mm, meanLoss eloss in MeV.
  double SampleFluctuations(const double momentum,
                            const double mass,
                            double& tmax,
                            const double length,
                            const double meanLoss);
  
  //G4double Dispersion(    const G4Material*,
  //                        const G4DynamicParticle*,
  //                        G4double&,
  //                        G4double&);
  //void Initialise(const G4ParticleDefinition*);

protected:

private:

  // hide assignment operator
  //G4UniversalFluctuation & operator=(const  G4UniversalFluctuation &right);
  //G4UniversalFluctuation(const  G4UniversalFluctuation&);

  //const G4ParticleDefinition* particle;
  //const G4Material* lastMaterial;

  double particleMass;
  double chargeSquare;

  // data members to speed up the fluctuation calculation
  double ipotFluct;
  double electronDensity;
  //  G4double zeff;
  
  double f1Fluct;
  double f2Fluct;
  double e1Fluct;
  double e2Fluct;
  double rateFluct;
  double e1LogFluct;
  double e2LogFluct;
  double ipotLogFluct;
  double e0;

  double minNumberInteractionsBohr;
  double theBohrBeta2;
  double minLoss;
  double problim;
  double sumalim;
  double alim;
  int    nmaxCont1;
  int    nmaxCont2;

};

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#endif