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//
//---------------------------------------------------------------------------
//
// 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 "G4VDiscreteProcess.hh"
#include "globals.hh"
#include "G4ParticleChangeForGamma.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 kinEnergyThreshold;
  G4String regionName;
  G4Region* region;
  G4ParticleChangeForGamma fParticleChange;
};

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#endif