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// $Id: G4UniversalFluctuation93.hh,v 1.2 2010/10/26 10:06:12 vnivanch Exp $
// GEANT4 tag $Name: emstand-V09-03-24 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4UniversalFluctuation93
//
// Author:        V.Ivanchenko make a class with the Laszlo Urban model
//
// 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)
// 07-02-05 define problim = 5.e-3 (mma)
// 14-06-10 saved version of 9.3 model with the name G4UniversalFluctuation93
//
// Class Description:
//
// Implementation of energy loss fluctuations

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

#ifndef G4UniversalFluctuation93_h
#define G4UniversalFluctuation93_h 1


#include "G4VEmFluctuationModel.hh"
#include "G4ParticleDefinition.hh"

class G4UniversalFluctuation93 : public G4VEmFluctuationModel
{

public:

  G4UniversalFluctuation93(const G4String& nam = "UniFluc93");

  virtual ~G4UniversalFluctuation93();

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

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

  virtual void InitialiseMe(const G4ParticleDefinition*);

  // Initialisation prestep
  virtual void SetParticleAndCharge(const G4ParticleDefinition*, G4double q2);

private:

  // hide assignment operator
  G4UniversalFluctuation93 & operator=(const  G4UniversalFluctuation93 &right);
  G4UniversalFluctuation93(const  G4UniversalFluctuation93&);

  const G4ParticleDefinition* particle;
  const G4Material* lastMaterial;

  G4double particleMass;
  G4double chargeSquare;

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

  G4double e1,e2;

  G4double minNumberInteractionsBohr;
  G4double theBohrBeta2;
  G4double minLoss;
  G4double nmaxCont1;
  G4double nmaxCont2;

};

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

#endif