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//
//---------------------------------------------------------------------------
//
// ClassName:   ElectronCapture
//
// Description: The process to kill e- to save CPU
//
// Author:      V.Ivanchenko 31 August 2010
//
//----------------------------------------------------------------------------
//
// Class description:
//
// ElectronCapture 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 
//

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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 ElectronCapture : public G4VDiscreteProcess
{
public:

  ElectronCapture(const G4String& regName, G4double ekinlimit);

  virtual ~ElectronCapture();

  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
  ElectronCapture(const ElectronCapture&);
  ElectronCapture& operator = (const ElectronCapture &right);

  G4double kinEnergyThreshold;
  G4String regionName;
  G4Region* region;
  G4ParticleChangeForGamma fParticleChange;
};

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#endif

