G4OpMieHG.hh

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////////////////////////////////////////////////////////////////////////
//
// File G4OpMieHG.hh
// Description: Discrete Process -- Mie Scattering of Optical Photons
// Created: 2010-07-03
// Author: Xin Qian
// Based on work from Vlasios Vasileiou
//
// This subroutine will mimic the Mie scattering based on
// Henyey-Greenstein phase function
// Forward and backward angles are treated separately.
//
////////////////////////////////////////////////////////////////////////
 
#ifndef G4OpMieHG_h
#define G4OpMieHG_h 1
 
#include "G4VDiscreteProcess.hh"
#include "G4OpticalPhoton.hh"
 
class G4OpMieHG : public G4VDiscreteProcess
{
 public:
  explicit G4OpMieHG(const G4String& processName = "OpMieHG",
                     G4ProcessType type          = fOptical);
  virtual ~G4OpMieHG();
 
  virtual G4bool IsApplicable(
    const G4ParticleDefinition& aParticleType) override;
  // Returns true -> 'is applicable' only for an optical photon.
 
  virtual G4double GetMeanFreePath(const G4Track& aTrack, G4double,
                                   G4ForceCondition*) override;
  // Return the mean free path of Mie scattering
 
  virtual G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
                                          const G4Step& aStep) override;
  // This is the method implementing Mie scattering.
 
  virtual void PreparePhysicsTable(const G4ParticleDefinition&) override;
  virtual void Initialise();
 
 private:
  G4OpMieHG(const G4OpMieHG& right) = delete;
  G4OpMieHG& operator=(const G4OpMieHG& right) = delete;
 
  size_t idx_mie = 0;
};
 
inline G4bool G4OpMieHG::IsApplicable(const G4ParticleDefinition& aParticleType)
{
  return (&aParticleType == G4OpticalPhoton::OpticalPhoton());
}
 
#endif /* G4OpMieHG_h */