G4WentzelVIModel.hh

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// $Id$
//
// -------------------------------------------------------------------
//
//
// 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"
 
class G4ParticleDefinition;
class G4LossTableManager;
class G4NistManager;
class G4Pow;
 
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class G4WentzelVIModel : public G4VMscModel
{
 
public:
 
  G4WentzelVIModel(const G4String& nam = "WentzelVIUni");
 
  virtual ~G4WentzelVIModel();
 
  virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
 
  void StartTracking(G4Track*);
 
  virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
                          G4double KineticEnergy,
                          G4double AtomicNumber,
                          G4double AtomicWeight=0., 
                          G4double cut = DBL_MAX,
                          G4double emax= DBL_MAX);
 
  virtual G4ThreeVector& SampleScattering(const G4DynamicParticle*, 
                      G4double safety);
 
  virtual G4double ComputeTruePathLengthLimit(const G4Track& track,
                          G4double& currentMinimalStep);
 
  virtual G4double ComputeGeomPathLength(G4double truePathLength);
 
  virtual G4double ComputeTrueStepLength(G4double geomStepLength);
 
private:
 
  G4double ComputeXSectionPerVolume();
 
  inline void SetupParticle(const G4ParticleDefinition*);
 
  inline void DefineMaterial(const G4MaterialCutsCouple*);
 
  //  hide assignment operator
  G4WentzelVIModel & operator=(const  G4WentzelVIModel &right);
  G4WentzelVIModel(const  G4WentzelVIModel&);
 
  G4LossTableManager*       theManager;
  G4NistManager*            fNistManager;
  G4ParticleChangeForMSC*   fParticleChange;
  G4WentzelOKandVIxSection* wokvi;
  G4Pow*                    fG4pow;
 
  const G4DataVector*       currentCuts;
 
  G4double tlimitminfix;
  G4double invsqrt12;
 
  // cache kinematics
  G4double preKinEnergy;
  G4double tPathLength;
  G4double zPathLength;
  G4double lambdaeff;
  G4double currentRange; 
 
  // data for single scattering mode
  G4double xtsec;
  std::vector<G4double> xsecn;
  std::vector<G4double> prob;
  G4int    nelments;
 
  G4double numlimit;
 
  // cache material
  G4int    currentMaterialIndex;
  const G4MaterialCutsCouple* currentCouple;
  const G4Material* currentMaterial;
 
  // single scattering parameters
  G4double cosThetaMin;
  G4double cosThetaMax;
  G4double cosTetMaxNuc;
 
  // projectile
  const G4ParticleDefinition* particle;
  G4double lowEnergyLimit;
 
  // flags
  G4bool   inside;
  G4bool   singleScatteringMode;
};
 
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inline
void G4WentzelVIModel::DefineMaterial(const G4MaterialCutsCouple* cup) 
{ 
  if(cup != currentCouple) {
    currentCouple = cup;
    SetCurrentCouple(cup); 
    currentMaterial = cup->GetMaterial();
    currentMaterialIndex = currentCouple->GetIndex(); 
  }
}
 
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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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#endif