G4Cerenkov.hh

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// $Id$
//
// 
// Cerenkov Radiation Class Definition 
//
// File:        G4Cerenkov.hh  
// Description: Discrete Process - Generation of Cerenkov Photons
// Version:     2.0
// Created:     1996-02-21
// Author:      Juliet Armstrong
// Updated:     2007-09-30 change inheritance to G4VDiscreteProcess
//              2005-07-28 add G4ProcessType to constructor
//              1999-10-29 add method and class descriptors
//              1997-04-09 by Peter Gumplinger
//              > G4MaterialPropertiesTable; new physics/tracking scheme
// mail:        gum@triumf.ca
//

#ifndef G4Cerenkov_h
#define G4Cerenkov_h 1

// Includes

#include <CLHEP/Units/SystemOfUnits.h>

#include "globals.hh"
#include "templates.hh"
#include "Randomize.hh"
#include "G4ThreeVector.hh"
#include "G4ParticleMomentum.hh"
#include "G4Step.hh"
#include "G4VProcess.hh"
#include "G4OpticalPhoton.hh"
#include "G4DynamicParticle.hh"
#include "G4Material.hh" 
#include "G4PhysicsTable.hh"
#include "G4MaterialPropertyVector.hh"
#include "G4MaterialPropertiesTable.hh"
#include "G4PhysicsOrderedFreeVector.hh"

// Class Description:
// Discrete Process -- Generation of Cerenkov Photons.
// Class inherits publicly from G4VDiscreteProcess.
// Class Description - End:

// Class Definition

class G4Cerenkov : public G4VProcess
{

public:

        // Constructors and Destructor

        G4Cerenkov(const G4String& processName = "Cerenkov", 
                            G4ProcessType type = fElectromagnetic);
        ~G4Cerenkov();

        G4Cerenkov(const G4Cerenkov &right);

private:

        // Operators

        G4Cerenkov& operator=(const G4Cerenkov &right);

public:

        // Methods

        G4bool IsApplicable(const G4ParticleDefinition& aParticleType);
        // Returns true -> 'is applicable', for all charged particles
        // except short-lived particles.

        G4double GetMeanFreePath(const G4Track& aTrack,
                                 G4double ,
                                 G4ForceCondition* );
        // Returns the discrete step limit and sets the 'StronglyForced'
        // condition for the DoIt to be invoked at every step.

        G4double PostStepGetPhysicalInteractionLength(const G4Track& aTrack,
                                                      G4double ,
                                                      G4ForceCondition* );
        // Returns the discrete step limit and sets the 'StronglyForced'
        // condition for the DoIt to be invoked at every step.

        G4VParticleChange* PostStepDoIt(const G4Track& aTrack, 
                                        const G4Step&  aStep);
        // This is the method implementing the Cerenkov process.

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

        virtual G4double AtRestGetPhysicalInteractionLength(
                               const G4Track& ,
                               G4ForceCondition*
                              ) { return -1.0; };

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

        virtual G4VParticleChange* AlongStepDoIt(
                               const G4Track& ,
                               const G4Step&
                              ) {return 0;};

        void SetTrackSecondariesFirst(const G4bool state);
        // If set, the primary particle tracking is interrupted and any 
        // produced Cerenkov photons are tracked next. When all have 
        // been tracked, the tracking of the primary resumes. 
        
        void SetMaxBetaChangePerStep(const G4double d);
        // Set the maximum allowed change in beta = v/c in % (perCent)
        // per step.

        void SetMaxNumPhotonsPerStep(const G4int NumPhotons);
        // Set the maximum number of Cerenkov photons allowed to be 
        // generated during a tracking step. This is an average ONLY; 
        // the actual number will vary around this average. If invoked, 
        // the maximum photon stack will roughly be of the size set.
        // If not called, the step is not limited by the number of 
        // photons generated.

        G4PhysicsTable* GetPhysicsTable() const;
        // Returns the address of the physics table.

        void DumpPhysicsTable() const;
        // Prints the physics table.

private:

        void BuildThePhysicsTable();

        // Helper Functions

        G4double GetAverageNumberOfPhotons(const G4double charge,
                                const G4double beta,
                                const G4Material *aMaterial,
                                G4MaterialPropertyVector* Rindex) const;

        // Class Data Members

protected:

        G4PhysicsTable* thePhysicsTable;
        //  A Physics Table can be either a cross-sections table or
        //  an energy table (or can be used for other specific
        //  purposes).

private:

        G4bool fTrackSecondariesFirst;
        G4double fMaxBetaChange;
        G4int  fMaxPhotons;
};

// Inline methods

inline 
G4bool G4Cerenkov::IsApplicable(const G4ParticleDefinition& aParticleType)
{
   if (aParticleType.GetParticleName() == "chargedgeantino") return false;
   if (aParticleType.IsShortLived()) return false;

   return (aParticleType.GetPDGCharge() != 0);
}

inline 
void G4Cerenkov::SetTrackSecondariesFirst(const G4bool state) 
{ 
        fTrackSecondariesFirst = state;
}

inline
void G4Cerenkov::SetMaxBetaChangePerStep(const G4double value)
{
        fMaxBetaChange = value*CLHEP::perCent;
}

inline
void G4Cerenkov::SetMaxNumPhotonsPerStep(const G4int NumPhotons) 
{ 
        fMaxPhotons = NumPhotons;
}

inline
void G4Cerenkov::DumpPhysicsTable() const
{
        G4int PhysicsTableSize = thePhysicsTable->entries();
        G4PhysicsOrderedFreeVector *v;

        for (G4int i = 0 ; i < PhysicsTableSize ; i++ )
        {
                v = (G4PhysicsOrderedFreeVector*)(*thePhysicsTable)[i];
                v->DumpValues();
        }
}

inline
G4PhysicsTable* G4Cerenkov::GetPhysicsTable() const
{
  return thePhysicsTable;
}

#endif /* G4Cerenkov_h */

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