G4ParticleChange.hh

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// G4ParticleChange
//
// Class description:
//
// Concrete class for ParticleChange containing the results after
// invocation of a physics process.
// This includes final states of parent particle (momentum, energy,
// etc) and secondary particles generated by the interaction.
// The tracking assumes that all the values of energy and momentum
// are in global reference system, therefore all the needed Lorentz
// transformations must have been already computed when filling the
// data-members of this class.
//
// IMPORTANT NOTE: Despite the name, what this class stores/returns
// through its methods, are the "FINAL" values of the Position,
// Momentum, etc.
 
// Author: Hisaya Kurashige, 23 March 1998  
// --------------------------------------------------------------------
#ifndef G4ParticleChange_hh
#define G4ParticleChange_hh 1
 
#include "globals.hh"
#include "G4ios.hh"
#include "G4ThreeVector.hh"
#include "G4VParticleChange.hh"
 
class G4DynamicParticle;
 
class G4ParticleChange : public G4VParticleChange
{
  public:
 
    G4ParticleChange();
      // Default constructor
 
    ~G4ParticleChange() override = default;
      // Destructor
 
    G4ParticleChange(const G4ParticleChange& right) = delete;
    G4ParticleChange& operator=(const G4ParticleChange& right) = delete;
 
  // --- the following methods are for updating G4Step -----
  // Return the pointer to G4Step after updating the Step information
  // by using final state of the track given by a physics process
 
    G4Step* UpdateStepForAlongStep(G4Step* Step) override;
      // A physics process gives the final state of the particle
      // relative to the initial state at the beginning of the Step,
      // i.e., based on information of G4Track (or equivalently
      // the PreStepPoint).
      // In this method, the differences (delta) between these two states
      // are calculated, and are accumulated in PostStepPoint.
      // Take note that the return type of GetMomentumChange() is a
      // pointer to G4ParticleMomentum. Also it is a normalized
      // momentum vector
 
    G4Step* UpdateStepForAtRest(G4Step* Step) override;
    G4Step* UpdateStepForPostStep(G4Step* Step) override;
      // A physics process gives the final state of the particle
      // based on information of G4Track (or equivalently the PreStepPoint)
 
    void Initialize(const G4Track&) override;
      // Initialize all propoerties by using G4Track information
 
  // --- methods to keep information of the final state ---
  //
  //  The ProposeXXX methods store (and return in GetXXX methods)
  //  the "FINAL" values of the Position, Momentum, etc.
 
    inline const G4ThreeVector* GetMomentumDirection() const;
    inline void ProposeMomentumDirection(G4double Px, G4double Py, G4double Pz);
    inline void ProposeMomentumDirection(const G4ThreeVector& Pfinal);
      // Get/Propose the MomentumDirection vector: it is the final momentum
      // direction
 
    inline const G4ThreeVector* GetPolarization() const;
    inline void ProposePolarization(G4double Px, G4double Py, G4double Pz);
    inline void ProposePolarization(const G4ThreeVector& finalPoralization);
      // Get/Propose the final Polarization vector
 
    inline G4double GetEnergy() const;
    inline void ProposeEnergy(G4double finalEnergy);
      // Get/Propose the final kinetic energy of the current particle
 
    inline G4double GetVelocity() const;
    inline void ProposeVelocity(G4double finalVelocity);
      // Get/Propose the final velocity of the current particle
 
    inline G4double GetProperTime() const;
    inline void ProposeProperTime(G4double finalProperTime);
      // Get/Propose the final ProperTime
 
    inline const G4ThreeVector* GetPosition() const;
    inline void ProposePosition(G4double x, G4double y, G4double z);
    inline void ProposePosition(const G4ThreeVector& finalPosition);
      // Get/Propose the final position of the current particle
 
    inline void ProposeGlobalTime(G4double t);
    inline void ProposeLocalTime(G4double t);
      // Get/Propose the final global/local Time.
      // NOTE: DO NOT INVOKE both methods in a step
      //       Each method affects both local and global time
 
    inline G4double GetGlobalTime(G4double timeDelay = 0.0) const;
    inline G4double GetLocalTime(G4double timeDelay = 0.0) const;
      // Convert the time delay to the glocbal/local time.
      // Can get the final global/local time without argument
 
    inline G4double GetMass() const;
    inline void ProposeMass(G4double finalMass);
      // Get/Propose the final dynamical mass in G4DynamicParticle
 
    inline G4double GetCharge() const;
    inline void ProposeCharge(G4double finalCharge);
      // Get/Propose the final dynamical charge in G4DynamicParticle
 
    inline G4double GetMagneticMoment() const;
    inline void ProposeMagneticMoment(G4double finalMagneticMoment);
      // Get/Propose the final MagneticMoment in G4DynamicParticle
 
    inline G4ThreeVector
    GetGlobalPosition(const G4ThreeVector& displacement) const;
      // Convert the position displacement to the global position
 
    inline G4ThreeVector CalcMomentum(G4double energy, G4ThreeVector direction,
                                      G4double mass) const;
      // Calculate momentum by using Energy, Momentum Direction, and Mass
 
  // --- methods for adding secondaries ---
 
    void AddSecondary(G4Track* aSecondary);
      // Add a secondary particle to theListOfSecondaries
 
    void AddSecondary(G4DynamicParticle* aSecondary,
                      G4bool IsGoodForTracking = false);
      // Add a secondary particle to theListOfSecondaries.
      // Position and time are same as thePositionChange and theTimeChange
 
    void AddSecondary(G4DynamicParticle* aSecondary, G4ThreeVector position,
                      G4bool IsGoodForTracking = false);
      // Add a secondary particle to theListOfSecondaries.
      // Global time are same as theTimeChange and theTimeChange
 
    void AddSecondary(G4DynamicParticle* aSecondary, G4double time,
                      G4bool IsGoodForTracking = false);
      // Add a secondary particle to theListOfSecondaries.
      // Position and are same as thePositionChange
 
  // --- Dump and debug methods ---
 
    void DumpInfo() const override;
 
  protected:
 
    G4Step* UpdateStepInfo(G4Step* Step);
      // Update the G4Step specific attributes
      // (i.e. SteppingControl, LocalEnergyDeposit, and TrueStepLength)
 
    G4ThreeVector theMomentumDirectionChange;
      // It is the vector containing the final momentum direction
      // after the invoked process. The application of the change
      // of the momentum direction of the particle is not done here.
      // The responsibility to apply the change is up to the entity
      // which invoked the process
 
    G4ThreeVector thePolarizationChange;
      // The changed (final) polarization of a given track
 
    G4double theEnergyChange = 0.0;
      // The final kinetic energy of the current track
 
    G4double theVelocityChange = 0.0;
    G4bool isVelocityChanged = false;
      // The final velocity of the current track
 
    G4ThreeVector thePositionChange;
      // The changed (final) position of a given track
 
    G4double theGlobalTime0 = 0.0;
      // The global time at Initial
    G4double theLocalTime0 = 0.0;
      // The local time at Initial
 
    G4double theTimeChange = 0.0;
      // The change of local time of a given particle
 
    G4double theProperTimeChange = 0.0;
      // The changed (final) proper time of a given track
 
    G4double theMassChange = 0.0;
      // The Changed (final) mass of a given track
 
    G4double theChargeChange = 0.0;
     // The Changed (final) charge of a given track
 
    G4double theMagneticMomentChange = 0.0;
     // The Changed (final) MagneticMoment of a given track
};
class G4ParticleChange : public G4VParticleChange {…};
 
#include "G4ParticleChange.icc"
 
#endif