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// ********************************************************************
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//
// $Id: G4hIonisation.hh,v 1.32 2005/05/12 11:06:43 vnivanch Exp $
// GEANT4 tag $Name: geant4-07-01 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4hIonisation
//
// Author:        Laszlo Urban
//
// Creation date: 30.05.1997
//
// Modifications:
//
// corrected by L.Urban on 24/09/97
// corrected by L.Urban on 13/01/98
// bugs fixed by L.Urban on 02/02/99
// 10/02/00 modifications , new e.m. structure, L.Urban
// 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
// 14-08-01 new function ComputeRestrictedMeandEdx() + 'cleanup' (mma)
// 19-09-01 come back to previous process name "hIoni"
// 29-10-01 all static functions no more inlined
// 07-01-02 new design of em processes (V.Ivanchenko)
// 26-12-02 secondary production moved to derived classes (VI)
// 24-01-03 Make models region aware (V.Ivanchenko)
// 05-02-03 Fix compilation warnings (V.Ivanchenko)
// 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
// 15-02-03 Add control on delta pointer (V.Ivanchenko)
// 23-05-03 Add fluctuation model as a member function (V.Ivanchenko)
// 03-06-03 Fix initialisation problem for STD ionisation (V.Ivanchenko)
// 16-06-03 ShortLived are not applicable any more (V.Ivanchenko)
// 08-08-03 STD substitute standard  (V.Ivanchenko)
// 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
// 21-01-04 Migrade to G4ParticleChangeForLoss (V.Ivanchenko)
// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 11-04-04 Move MaxSecondaryEnergy to models (V.Ivanchenko)
//
// Class Description:
//
// This class manages the ionisation process for hadrons.
// it inherites from G4VContinuousDiscreteProcess via G4VEnergyLoss.
//

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

#ifndef G4hIonisation_h
#define G4hIonisation_h 1

#include "G4VEnergyLossProcess.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "globals.hh"
#include "G4VEmModel.hh"

class G4Material;
class G4VEmFluctuationModel;

class G4hIonisation : public G4VEnergyLossProcess
{

public:

  G4hIonisation(const G4String& name = "hIoni");

  virtual ~G4hIonisation();

  G4bool IsApplicable(const G4ParticleDefinition& p);

  G4double MinPrimaryEnergy(const G4ParticleDefinition* p,
			    const G4Material*, G4double cut);

  // Print out of the class parameters
  virtual void PrintInfo();

protected:

  std::vector<G4DynamicParticle*>*  SecondariesPostStep(
                                   G4VEmModel*,
                             const G4MaterialCutsCouple*,
                             const G4DynamicParticle*,
                                   G4double&);

  virtual void InitialiseEnergyLossProcess(const G4ParticleDefinition*,
					   const G4ParticleDefinition*);

private:

  // hide assignment operator
  G4hIonisation & operator=(const G4hIonisation &right);
  G4hIonisation(const G4hIonisation&);

  G4double   mass;
  G4double   ratio;

  const G4ParticleDefinition* theParticle;
  const G4ParticleDefinition* theBaseParticle;
  G4VEmFluctuationModel*      flucModel;

  G4bool                      isInitialised;

  G4double                    eth;

};

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

inline G4bool G4hIonisation::IsApplicable(const G4ParticleDefinition& p)
{
  return (p.GetPDGCharge() != 0.0 && p.GetPDGMass() > 10.0*MeV &&
	 !p.IsShortLived());
}

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

inline G4double G4hIonisation::MinPrimaryEnergy(const G4ParticleDefinition*,
						const G4Material*,
						G4double cut)
{
  G4double x = 0.5*cut/electron_mass_c2;
  G4double y = electron_mass_c2/mass;
  G4double g = x*y + std::sqrt((1. + x)*(1. + x*y*y));
  return mass*(g - 1.0);
}

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

inline std::vector<G4DynamicParticle*>* G4hIonisation::SecondariesPostStep(
                                                  G4VEmModel* model,
                                            const G4MaterialCutsCouple* couple,
                                            const G4DynamicParticle* dp,
                                                  G4double& tcut)
{
  return model->SampleSecondaries(couple, dp, tcut);
}

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

#endif