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//
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4hIonisationSTD
//
// 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  
//
// Class Description: 
//
// This class manages the ionisation process for hadrons.
// it inherites from G4VContinuousDiscreteProcess via G4VEnergyLoss.
// 

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

#ifndef G4hIonisationSTD_h
#define G4hIonisationSTD_h 1

#include "G4VEnergyLossSTD.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "globals.hh"

class G4Material;

class G4hIonisationSTD : public G4VEnergyLossSTD
{

public:

  G4hIonisationSTD(const G4String& name = "hIoni");

  ~G4hIonisationSTD();
 
  G4bool IsApplicable(const G4ParticleDefinition& p) 
    {return (p.GetPDGCharge() != 0.0 && p.GetPDGMass() > 10.0*MeV);};

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

  void PrintInfoDefinition() const;
  // Print out of the class parameters

protected:

  virtual const G4ParticleDefinition* DefineBaseParticle(const G4ParticleDefinition* p);

  virtual G4double MaxSecondaryEnergy(const G4DynamicParticle* dynParticle);

private:

  void InitialiseProcess();

  // hide assignment operator 
  G4hIonisationSTD & operator=(const G4hIonisationSTD &right);
  G4hIonisationSTD(const G4hIonisationSTD&);

  const G4ParticleDefinition* theParticle;
  const G4ParticleDefinition* theBaseParticle;
  G4double   mass;
  G4double   ratio;
};

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

inline G4double G4hIonisationSTD::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 + sqrt((1. + x)*(1. + x*y*y));
  return mass*(g - 1.0); 
}

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

inline G4double G4hIonisationSTD::MaxSecondaryEnergy(const G4DynamicParticle* dynParticle)
{
  G4double gamma= dynParticle->GetKineticEnergy()/mass + 1.0;
  G4double tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
                  (1. + 2.0*gamma*ratio + ratio*ratio);
  
  return tmax;
}

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

#endif