G4UrbanMscModel90.hh

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// $Id$
//
// -------------------------------------------------------------------
//
//
// GEANT4 Class header file
//
//
// File name:     G4UrbanMscModel90
//
// Author:        V.Ivanchenko clone Laszlo Urban model
//
// Creation date: 07.12.2007
//
// Modifications:
//
//
// Class Description:
//
// Implementation of the model of multiple scattering based on
// H.W.Lewis Phys Rev 78 (1950) 526 and L.Urban model
 
// -------------------------------------------------------------------
//
 
#ifndef G4UrbanMscModel90_h
#define G4UrbanMscModel90_h 1
 
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#include <CLHEP/Units/SystemOfUnits.h>
 
#include "G4VMscModel.hh"
#include "G4MscStepLimitType.hh"
 
class G4ParticleChangeForMSC;
class G4LossTableManager;
 
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class G4UrbanMscModel90 : public G4VMscModel
{
 
public:
 
  G4UrbanMscModel90(const G4String& nam = "UrbanMsc90");
 
  virtual ~G4UrbanMscModel90();
 
  void Initialise(const G4ParticleDefinition*, const G4DataVector&);
 
  void StartTracking(G4Track*);
 
  G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
                      G4double KineticEnergy,
                      G4double AtomicNumber,
                      G4double AtomicWeight=0., 
                      G4double cut =0.,
                      G4double emax=DBL_MAX);
 
  void SampleSecondaries(std::vector<G4DynamicParticle*>*, 
             const G4MaterialCutsCouple*,
             const G4DynamicParticle*,
             G4double,
             G4double);
 
  G4ThreeVector& SampleScattering(const G4DynamicParticle*, G4double safety);
 
  G4double ComputeTruePathLengthLimit(const G4Track& track,
                      G4double& currentMinimalStep);
 
  G4double ComputeGeomPathLength(G4double truePathLength);
 
  G4double ComputeTrueStepLength(G4double geomStepLength);
 
  G4double ComputeTheta0(G4double truePathLength,
                         G4double KineticEnergy);
 
private:
 
  G4double SampleCosineTheta(G4double trueStepLength, G4double KineticEnergy);
 
  G4double SampleDisplacement();
 
  G4double LatCorrelation();
 
  inline void SetParticle(const G4ParticleDefinition*);
 
  //  hide assignment operator
  G4UrbanMscModel90 & operator=(const  G4UrbanMscModel90 &right);
  G4UrbanMscModel90(const  G4UrbanMscModel90&);
 
  const G4ParticleDefinition* particle;
  G4ParticleChangeForMSC*     fParticleChange;
 
  const G4MaterialCutsCouple* couple;
  G4LossTableManager*         theManager;
 
  G4double mass;
  G4double charge;
 
  G4double masslimite,masslimitmu;
 
  G4double taubig;
  G4double tausmall;
  G4double taulim;
  G4double currentTau;
  G4double frscaling1,frscaling2;
  G4double tlimit;
  G4double tlimitmin;
  G4double tlimitminfix;
 
  G4double nstepmax;
  G4double geombig;
  G4double geommin;
  G4double geomlimit;
  G4double skindepth;
  G4double smallstep;
 
  G4double presafety;
 
  G4double lambda0;
  G4double lambdaeff;
  G4double tPathLength;
  G4double zPathLength;
  G4double par1,par2,par3;
 
  G4double stepmin;
 
  G4double currentKinEnergy;
  G4double currentRange; 
  G4double currentRadLength;
 
  G4double Zeff;
 
  G4int    currentMaterialIndex;
 
  G4bool   firstStep;
  G4bool   inside;
  G4bool   insideskin;
 
};
 
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inline
void G4UrbanMscModel90::SetParticle(const G4ParticleDefinition* p)
{
  if (p != particle) {
    particle = p;
    mass = p->GetPDGMass();
    charge = p->GetPDGCharge()/CLHEP::eplus;
  }
}
 
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#endif