TRTTransitionRadiation.h

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef TRTTRANSITIONRADIATION_H
#define TRTTRANSITIONRADIATION_H
 
#include "TRTRadiatorParameters.h"
#include "AthenaBaseComps/AthMessaging.h"
#include "G4VDiscreteProcess.hh"
 
#include <vector>
class G4Material;
class G4Step;
class G4Track;
 
 
class TRRegionXMLHandler;
 
class TRTTransitionRadiation : public G4VDiscreteProcess, public AthMessaging {
 
public:

  //                             Public Methods                              //
 
  TRTTransitionRadiation(const G4String& processName="TransitionRadiation", const std::string & xmlfilename="TRgeomodelgeometry.xml");
  virtual ~TRTTransitionRadiation();
 
  void Initialize();
  G4bool IsApplicable(const G4ParticleDefinition&);
  G4double GetMeanFreePath(const G4Track& aTrack, G4double, G4ForceCondition *);
  G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep);
 
  void AddRadiatorParameters(const TRTRadiatorParameters& p);
 
private:
 
  TRTTransitionRadiation (const TRTTransitionRadiation&);
  TRTTransitionRadiation& operator= (const TRTTransitionRadiation&);
  //                        Private Helper Methods                           //
 
  G4double ComputePhotoAbsCof( const G4Material* Material, const G4double & GammaEnergy ) const;
 
  G4double XEmitanNevski( const G4double & PhotonEnergy,
                          const G4double & Gamma,
                          const G4double & GasThickness,
                          const G4double & FoilThickness) const;
 
  G4double XEmitanArtru( const G4double & PhotonEnergy,
                         const G4double & Gamma,
                         const G4double &GasThickness,
                         const G4double &FoilThickness) const;
 
  G4double NeffNevski( const G4double & sigGas,
                       const G4double & sigFoil,
                       const G4double & GasThickness,
                       const G4double & FoilThickness,
                       const G4int    & FoilsTraversed ) const;
 
  G4double NeffArtru( const G4double & sigGas,
                      const G4double & sigFoil,
                      const G4double & GasThickness,
                      const G4double & FoilThickness,
                      const G4int    & FoilsTraversed ) const;
 
  G4double XFinter( const G4double & X, const G4double* A, const G4double* F ) const;
  G4double XInteg( const G4double* yy, G4double* ss ) const;

  //                               Member Data                               //
 
  //protected:
 
  TRRegionXMLHandler * m_XMLhandler;
  const std::string m_xmlfilename;
  std::vector<TRTRadiatorParameters> m_radiators;
 
  G4double m_MinEnergyTR;   // min TR energy in material
  G4double m_MaxEnergyTR;   // max TR energy in material
  G4int    m_NumBins;       // number of bins in log scale
 
  G4double m_WplasmaGas;    // plasma energy of foil and air.
  G4double m_WplasmaFoil;
 
  G4double m_GammaMin;      // Minimum value of Lorentz gamma for TR radiation
  G4double m_EkinMin;       // Corresponding KineticEnergy for electrons
 
  G4double* m_Ey;
  G4double* m_Sr;
  G4double* m_om;
  G4double* m_Omg;
  G4double* m_sigmaGas;
  G4double* m_sigmaFoil;
};
 
#endif