G4VITRestDiscreteProcess.hh

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// $Id: G4VITRestDiscreteProcess.hh 64057 2012-10-30 15:04:49Z gcosmo $
//
//
// WARNING : This class is released as a prototype.
// It might strongly evolve or even disapear in the next releases.
//
// Author: Mathieu Karamitros (kara (AT) cenbg . in2p3 . fr) 
//
// History:
// -----------
// 10 Oct 2011 M.Karamitros created
//
// -------------------------------------------------------------------

#ifndef G4VITRESTDISCRETEPROCESS_H
#define G4VITRESTDISCRETEPROCESS_H

#include <CLHEP/Units/SystemOfUnits.h>

#include "G4VITProcess.hh"

class G4VITRestDiscreteProcess : public G4VITProcess
{
  //  Abstract class which defines the public behavior of
  //  rest + discrete physics interactions.
  public:

     G4VITRestDiscreteProcess(const G4String& ,
                G4ProcessType   aType = fNotDefined );
     G4VITRestDiscreteProcess(G4VITRestDiscreteProcess &);

     virtual ~G4VITRestDiscreteProcess();

  public :// with description
     virtual G4double PostStepGetPhysicalInteractionLength(
                             const G4Track& track,
                 G4double   previousStepSize,
                 G4ForceCondition* condition
                );

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

     virtual G4double AtRestGetPhysicalInteractionLength(
                             const G4Track& ,
                 G4ForceCondition*
                );

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

     //  no operation in  AlongStepDoIt
     virtual G4double AlongStepGetPhysicalInteractionLength(
                             const G4Track&,
                 G4double  ,
                 G4double  ,
                 G4double& ,
                             G4GPILSelection*
                            ){ return -1.0; }

     //  no operation in  AlongStepDoIt
     virtual G4VParticleChange* AlongStepDoIt(
                 const G4Track& ,
                 const G4Step&
                            ) {return 0;}

  protected:// with description
     virtual G4double GetMeanFreePath(const G4Track& aTrack,
                             G4double   previousStepSize,
                             G4ForceCondition* condition
                           )=0;
      //  Calculates from the macroscopic cross section a mean
      //  free path, the value is returned in units of distance.

     virtual G4double GetMeanLifeTime(const G4Track& aTrack,G4ForceCondition* condition)=0;
      //  Calculates the mean life-time (i.e. for decays) of the
      //  particle at rest due to the occurence of the given process,
      //  or converts the probability of interaction (i.e. for
      //  annihilation) into the life-time of the particle for the
      //  occurence of the given process.

  private:
  // hide default constructor and assignment operator as private
      G4VITRestDiscreteProcess();
      G4VITRestDiscreteProcess & operator=(const G4VITRestDiscreteProcess &right);

};

// -----------------------------------------
//  inlined function members implementation
// -----------------------------------------
inline
 G4double G4VITRestDiscreteProcess::PostStepGetPhysicalInteractionLength(
                             const G4Track& track,
                 G4double   previousStepSize,
                 G4ForceCondition* condition
                )
{
  if ( (previousStepSize < 0.0) || (fpState->theNumberOfInteractionLengthLeft<=0.0)) {
    // beggining of tracking (or just after DoIt of this process)
    ResetNumberOfInteractionLengthLeft();
  } else if ( previousStepSize > 0.0) {
    // subtract NumberOfInteractionLengthLeft
    SubtractNumberOfInteractionLengthLeft(previousStepSize);
  } else {
    // zero step
    //  DO NOTHING
  }

  // condition is set to "Not Forced"
  *condition = NotForced;

  // get mean free path
  fpState->currentInteractionLength = GetMeanFreePath(track, previousStepSize, condition);

  G4double value;
  if (fpState->currentInteractionLength <DBL_MAX) {
    value = fpState->theNumberOfInteractionLengthLeft * (fpState->currentInteractionLength);
  } else {
    value = DBL_MAX;
  }
#ifdef G4VERBOSE
   if (verboseLevel>1){
    G4cout << "G4VITRestDiscreteProcess::PostStepGetPhysicalInteractionLength ";
    G4cout << "[ " << GetProcessName() << "]" <<G4endl;
    track.GetDynamicParticle()->DumpInfo();
    G4cout << " in Material  " <<  track.GetMaterial()->GetName() <<G4endl;
    G4cout << "InteractionLength= " << value/CLHEP::cm <<"[cm] " <<G4endl;
  }
#endif
  return value;
}

inline G4VParticleChange* G4VITRestDiscreteProcess::PostStepDoIt(
                 const G4Track& ,
                 const G4Step&
                )
{
//  reset NumberOfInteractionLengthLeft
    ClearNumberOfInteractionLengthLeft();

    return pParticleChange;
}

inline G4double G4VITRestDiscreteProcess::AtRestGetPhysicalInteractionLength(
                             const G4Track& track,
                 G4ForceCondition* condition
                )
{
  // beggining of tracking
  ResetNumberOfInteractionLengthLeft();

  // condition is set to "Not Forced"
  *condition = NotForced;

  // get mean life time
  fpState->currentInteractionLength = GetMeanLifeTime(track, condition);

#ifdef G4VERBOSE
   if ((fpState->currentInteractionLength <0.0) || (verboseLevel>2)){
    G4cout << "G4VITRestDiscreteProcess::AtRestGetPhysicalInteractionLength ";
    G4cout << "[ " << GetProcessName() << "]" <<G4endl;
    track.GetDynamicParticle()->DumpInfo();
    G4cout << " in Material  " << track.GetMaterial()->GetName() <<G4endl;
    G4cout << "MeanLifeTime = " << fpState->currentInteractionLength/CLHEP::ns << "[ns]" <<G4endl;
  }
#endif

  return fpState->theNumberOfInteractionLengthLeft * (fpState->currentInteractionLength);
}


inline G4VParticleChange* G4VITRestDiscreteProcess::AtRestDoIt(
                 const G4Track&,
                 const G4Step&
                )
{
//  clear NumberOfInteractionLengthLeft
    ClearNumberOfInteractionLengthLeft();

    return pParticleChange;
}



#endif