G4WentzelVIModel.hh

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// -------------------------------------------------------------------
//
//
// GEANT4 Class header file
//
//
// File name:     G4WentzelVIModel
//
// Author:        V.Ivanchenko 
//
// Creation date: 09.04.2008 from G4MuMscModel
//
// Modifications:
// 27-05-2010 V.Ivanchenko added G4WentzelOKandVIxSection class to
//              compute cross sections and sample scattering angle
//
// Class Description:
//
// Implementation of the model of multiple scattering based on
// G.Wentzel, Z. Phys. 40 (1927) 590.
// H.W.Lewis, Phys Rev 78 (1950) 526.
// J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
// L.Urban, CERN-OPEN-2006-077.
 
// -------------------------------------------------------------------
//
 
#ifndef G4WentzelVIModel_h
#define G4WentzelVIModel_h 1
 
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#include "G4VMscModel.hh"
#include "G4MaterialCutsCouple.hh"
#include "G4WentzelOKandVIxSection.hh"
 
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class G4WentzelVIModel : public G4VMscModel
{
 
public:
 
  explicit G4WentzelVIModel(G4bool comb=true, const G4String& nam = "WentzelVIUni");
 
  virtual ~G4WentzelVIModel();
 
  virtual void Initialise(const G4ParticleDefinition*, 
              const G4DataVector&) override;
 
  virtual void InitialiseLocal(const G4ParticleDefinition*, 
                               G4VEmModel* masterModel) override;
 
  virtual void StartTracking(G4Track*) override;
 
  virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
                          G4double KineticEnergy,
                          G4double AtomicNumber,
                          G4double AtomicWeight=0., 
                          G4double cut = DBL_MAX,
                          G4double emax= DBL_MAX) override;
 
  virtual G4ThreeVector& SampleScattering(const G4ThreeVector&, 
                      G4double safety) override;
 
  virtual G4double 
  ComputeTruePathLengthLimit(const G4Track& track,
                 G4double& currentMinimalStep) override;
 
  virtual G4double ComputeGeomPathLength(G4double truePathLength) override;
 
  virtual G4double ComputeTrueStepLength(G4double geomStepLength) override;
 
  // defines low energy limit on energy transfer to atomic electron
  inline void SetFixedCut(G4double);
 
  // low energy limit on energy transfer to atomic electron
  inline G4double GetFixedCut() const;
 
  // access to cross section class
  inline void SetWVICrossSection(G4WentzelOKandVIxSection*);
 
  inline G4WentzelOKandVIxSection* GetWVICrossSection();
 
  inline void SetUseSecondMoment(G4bool);
 
  inline G4bool UseSecondMoment() const;
 
  inline G4PhysicsTable* GetSecondMomentTable();
 
  inline G4double SecondMoment(const G4ParticleDefinition*,
                   const G4MaterialCutsCouple*,
                   G4double kineticEnergy);
 
  void SetSingleScatteringFactor(G4double);
 
  void DefineMaterial(const G4MaterialCutsCouple*);
 
protected:
 
  G4double ComputeTransportXSectionPerVolume(G4double cosTheta);
 
  inline void SetupParticle(const G4ParticleDefinition*);
 
private:
 
  G4double ComputeSecondMoment(const G4ParticleDefinition*,
                   G4double kineticEnergy);
 
  //  hide assignment operator
  G4WentzelVIModel & operator=(const  G4WentzelVIModel &right) = delete;
  G4WentzelVIModel(const  G4WentzelVIModel&) = delete;
 
protected:
 
  G4WentzelOKandVIxSection* wokvi;
 
  G4double tlimitminfix;
  G4double ssFactor;
  G4double invssFactor;
 
  // cache kinematics
  G4double preKinEnergy;
  G4double tPathLength;
  G4double zPathLength;
  G4double lambdaeff;
  G4double currentRange; 
  G4double cosTetMaxNuc;
 
  // cache material
  G4int    currentMaterialIndex;
  const G4MaterialCutsCouple* currentCouple;
  const G4Material* currentMaterial;
 
  const G4ParticleDefinition* particle;
  G4ParticleChangeForMSC*   fParticleChange;
  const G4DataVector*       currentCuts;
 
  G4double invsqrt12;
  G4double fixedCut;
 
  // cache kinematics
  G4double effKinEnergy;
 
  // single scattering parameters
  G4double cosThetaMin;
  G4double cosThetaMax;
 
  G4PhysicsTable* fSecondMoments;
  size_t          idx2;
 
  // data for single scattering mode
  G4int minNCollisions;
  G4int nelments;
  std::vector<G4double> xsecn;
  std::vector<G4double> prob;
 
  G4double xtsec;
  G4double numlimit;
 
  // projectile
  G4double lowEnergyLimit;
 
  // flags
  G4bool   singleScatteringMode;
  G4bool   isCombined;
  G4bool   useSecondMoment;
};
 
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inline void G4WentzelVIModel::SetupParticle(const G4ParticleDefinition* p)
{
  // Initialise mass and charge
  if(p != particle) {
    particle = p;
    wokvi->SetupParticle(p);
  }
}
 
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inline void G4WentzelVIModel::SetFixedCut(G4double val)
{
  fixedCut = val;
}
 
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inline G4double G4WentzelVIModel::GetFixedCut() const
{
  return fixedCut;
}
 
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inline void G4WentzelVIModel::SetWVICrossSection(G4WentzelOKandVIxSection* ptr)
{
  if(ptr != wokvi) {
    delete wokvi;
    wokvi = ptr;
  }
}
 
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inline G4WentzelOKandVIxSection* G4WentzelVIModel::GetWVICrossSection()
{
  return wokvi;
}
 
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inline void G4WentzelVIModel::SetUseSecondMoment(G4bool val)
{
  useSecondMoment = val;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
inline G4bool G4WentzelVIModel::UseSecondMoment() const
{
  return useSecondMoment;
}
 
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inline G4PhysicsTable* G4WentzelVIModel::GetSecondMomentTable()
{
  return fSecondMoments;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
inline G4double 
G4WentzelVIModel::SecondMoment(const G4ParticleDefinition* part,
                   const G4MaterialCutsCouple* couple,
                   G4double ekin)
{
  G4double x = 0.0;
  if(useSecondMoment) { 
    DefineMaterial(couple);
    x = (fSecondMoments) ?  
      (*fSecondMoments)[(*theDensityIdx)[currentMaterialIndex]]->Value(ekin, idx2)
      *(*theDensityFactor)[currentMaterialIndex]/(ekin*ekin)
      : ComputeSecondMoment(part, ekin);
  }
  return x;
}
 
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#endif