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/// \file G4ElectronCapture.hh
/// \brief Definition of the G4ElectronCapture class

//---------------------------------------------------------------------------
//
// ClassName:   G4ElectronCapture
//
// Description: The process to kill e- to save CPU
//
// Author:      V.Ivanchenko 31 August 2010
//
//----------------------------------------------------------------------------
//
// Class description:
//
// G4ElectronCapture allows to remove unwanted e- from simulation in
// order to improve CPU performance. There are two parameters:
//
// 1) low energy threshold for e- kinetic energy (default 0)
// 2) the name of G4Region where process is active
//
//
// If an electron track is killed then energy deposition is added to the step
//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software
// and the DNA geometry given in the Geom_DNA example
// shall cite the following Geant4-DNA collaboration publications:
// [1] NIM B 298 (2013) 47-54
// [2] Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//
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#ifndef ElectronCapture_h
#define ElectronCapture_h 1

#include "G4ParticleChangeForGamma.hh"
#include "G4VDiscreteProcess.hh"
#include "globals.hh"

class G4Region;

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class G4ElectronCapture : public G4VDiscreteProcess
{
  public:
    G4ElectronCapture(const G4String& regName, G4double ekinlimit);

    virtual ~G4ElectronCapture();

    void SetKinEnergyLimit(G4double);

    virtual void BuildPhysicsTable(const G4ParticleDefinition&);

    virtual G4bool IsApplicable(const G4ParticleDefinition&);

    virtual G4double PostStepGetPhysicalInteractionLength(const G4Track& track,
                                                          G4double previousStepSize,
                                                          G4ForceCondition* condition);

    virtual G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&);

  protected:
    virtual G4double GetMeanFreePath(const G4Track&, G4double, G4ForceCondition*);

  private:
    // hide assignment operator as private
    G4ElectronCapture(const G4ElectronCapture&);
    G4ElectronCapture& operator=(const G4ElectronCapture& right);

    G4double fKinEnergyThreshold;
    G4String fRegionName;
    G4Region* region;
    G4ParticleChangeForGamma fParticleChange;
};

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#endif
