G4NeutronKiller.hh

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//
//---------------------------------------------------------------------------
//
// ClassName:   G4NeutronKiller
//
// Description: The process to kill neutrons to save CPU
//
// Author:      V.Ivanchenko 26/09/00 for HARP software
//
//----------------------------------------------------------------------------
//
// Class description:
//
// G4NeutronKiller allows to remove unwanted neutrons from simulation in 
// order to improve CPU performance. There are two parameters:
//                 
// 1) low energy threshold for neutron kinetic energy (default 0)
// 2) time limit for neutron track (default DBL_MAX) 
// 
// These parameters can be changed via Set methods or by UI commands:
//   /physics_engine/neutron/energyCut
//   /physics_engine/neutron/timeLimit
//
// If a neutron track is killed no energy deposition is added to the step 
//
 
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#ifndef NeutronKiller_h
#define NeutronKiller_h 1
 
#include "globals.hh"
#include "G4VDiscreteProcess.hh"
#include "G4ParticleDefinition.hh"
#include "G4Step.hh"
#include "G4Track.hh"
 
class G4NeutronKillerMessenger;
 
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class G4NeutronKiller : public G4VDiscreteProcess
{
public:
 
  G4NeutronKiller(const G4String& processName = "nKiller",
          G4ProcessType   aType =  fGeneral );
 
  virtual ~G4NeutronKiller();
 
  virtual G4bool IsApplicable(const G4ParticleDefinition&);
 
  void  SetTimeLimit(G4double);
 
  void  SetKinEnergyLimit(G4double);
 
  virtual G4double PostStepGetPhysicalInteractionLength( const G4Track& track,
                             G4double previousStepSize,
                             G4ForceCondition* condition);
 
  virtual G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&);
 
  virtual G4double GetMeanFreePath(const G4Track&, G4double,G4ForceCondition*);
 
private:
 
  // hide assignment operator as private
  G4NeutronKiller(const G4NeutronKiller&);
  G4NeutronKiller& operator = (const G4NeutronKiller &right);
 
  G4double kinEnergyThreshold;
  G4double timeThreshold;
     
  G4NeutronKillerMessenger* pMess;
};
 
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#endif