G4UrbanMscModel90.hh

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// $Id: G4UrbanMscModel90.hh 66592 2012-12-23 09:34:55Z vnivanch $
//
// -------------------------------------------------------------------
//
//
// 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 G4ThreeVector&, 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

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