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// $Id: G4UniversalFluctuation.hh,v 1.12 2004/05/11 15:35:07 vnivanch Exp $
// GEANT4 tag $Name: geant4-06-02 $
//
// -------------------------------------------------------------------
//
// 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)
// 16-10-03 Changed interface to Initialisation (V.Ivanchenko)
//
// Class Description:
//
// Implementation of energy loss fluctuations

// -------------------------------------------------------------------
//

#ifndef G4UniversalFluctuation_h
#define G4UniversalFluctuation_h 1


#include "G4VEmFluctuationModel.hh"

class G4UniversalFluctuation : public G4VEmFluctuationModel
{

public:

  G4UniversalFluctuation(const G4String& nam = "UniFluc");

  ~G4UniversalFluctuation();

  G4double SampleFluctuations(const G4Material*,
                          const G4DynamicParticle*,
 				G4double&,
                                G4double&,
                                G4double&);

  G4double Dispersion(    const G4Material*,
                          const G4DynamicParticle*,
 				G4double&,
                                G4double&);

  void InitialiseMe(const G4ParticleDefinition*);

protected:

private:

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

  const G4ParticleDefinition* particle;
  const G4Material* lastMaterial;

  G4double particleMass;
  G4double chargeSquare;

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

  G4double minNumberInteractionsBohr;
  G4double theBohrBeta2;
  G4double minLoss;
  G4double sumalim;
  G4double alim;
  G4double nmaxCont1;
  G4double nmaxCont2;
};

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

#endif