G4SeltzerBergerModel.hh

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//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4SeltzerBergerModel
//
// Author:        Andreas Schaelicke & Vladimir Ivantchenko
//
// Creation date: 04.10.2011
//
// Modifications:
//
// 24.07.2018 Introduced possibility to use sampling tables to sample the
//            emitted photon energy (instead of using rejectio) from the 
//            Seltzer-Berger scalled DCS for bremsstrahlung photon emission. 
//            Using these sampling tables option gives faster(30-70%) final 
//            state generation than the original rejection but takes some 
//            extra memory (+ ~6MB in the case of the full CMS detector). 
//            (M Novak)
//
// Class Description:
//
// Implementation of the bremssrahlung energy spectrum using
// 1. S.M. Seltzer and M.J. Berger Nucl. Instr. Meth. B12 (1985) 95
// 2. S.M. Seltzer and M.J. Berger Atomic data and Nuclear Data
//    Tables 35 (1986) 345
// Cross section computation in the base class G4eBremsstrahlungRelModel
 
// -------------------------------------------------------------------
//
 
#ifndef G4SeltzerBergerModel_h
#define G4SeltzerBergerModel_h 1
 
#include "G4eBremsstrahlungRelModel.hh"
#include "globals.hh"
 
class G4Physics2DVector;
class G4SBBremTable;
 
class G4SeltzerBergerModel : public G4eBremsstrahlungRelModel
{
 
public:
 
  explicit G4SeltzerBergerModel(const G4ParticleDefinition* p = nullptr,
                                const G4String& nam = "eBremSB");
 
  ~G4SeltzerBergerModel() override;
 
  void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
 
  void SampleSecondaries(std::vector<G4DynamicParticle*>*,
                         const G4MaterialCutsCouple*,
                         const G4DynamicParticle*,
             G4double cutEnergy,
                         G4double maxEnergy) override;
 
  void SetupForMaterial(const G4ParticleDefinition*,
                        const G4Material*, G4double) override;
 
  inline void SetBicubicInterpolationFlag(G4bool val) 
  { fIsUseBicubicInterpolation = val; };
 
  // hide assignment operator and cctr
  G4SeltzerBergerModel & operator=(const G4SeltzerBergerModel &right) = delete;
  G4SeltzerBergerModel(const G4SeltzerBergerModel&) = delete;
 
protected:
 
  G4double ComputeDXSectionPerAtom(G4double gammaEnergy) override;
 
private:
 
  void ReadData(G4int Z);
 
  const G4String& FindDirectoryPath();
 
  G4double SampleEnergyTransfer(const G4double kineticEnergy, 
                                const G4double logKineticEnergy, 
                                const G4double cut,
                                const G4double emax);
 
  static constexpr G4int    gMaxZet       = 101;
  static constexpr G4double gExpNumLimit  = -12.;
  static G4double           gYLimitData[gMaxZet];
  static G4Physics2DVector* gSBDCSData[gMaxZet];
  static G4SBBremTable*     gSBSamplingTable;
  static G4String           gDataDirectory;
 
  G4bool                    fIsUseBicubicInterpolation;
  G4bool                    fIsUseSamplingTables;
 
  G4int                     fNumWarnings;
 
  size_t                    fIndx;
  size_t                    fIndy;
};
 
#endif