source: trunk/source/processes/electromagnetic/standard/include/G4UrbanMscModel90.hh @ 1199

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// $Id: G4UrbanMscModel90.hh,v 1.6 2009/11/01 13:04:12 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// -------------------------------------------------------------------
//
//
// 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 "G4VMscModel.hh"
#include "G4PhysicsTable.hh"
#include "G4MscStepLimitType.hh"

class G4ParticleChangeForMSC;
class G4SafetyHelper;
class G4LossTableManager;

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class G4UrbanMscModel90 : public G4VMscModel
{

public:

  G4UrbanMscModel90(const G4String& nam = "UrbanMsc90");

  virtual ~G4UrbanMscModel90();

  void Initialise(const G4ParticleDefinition*, const G4DataVector&);

  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);

  void SampleScattering(const G4DynamicParticle*,
                        G4double safety);

  G4double ComputeTruePathLengthLimit(const G4Track& track,
                                      G4PhysicsTable* theLambdaTable,
                                      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 G4double GetLambda(G4double kinEnergy);

  inline void SetParticle(const G4ParticleDefinition*);

  //  hide assignment operator
  G4UrbanMscModel90 & operator=(const  G4UrbanMscModel90 &right);
  G4UrbanMscModel90(const  G4UrbanMscModel90&);

  const G4ParticleDefinition* particle;
  G4ParticleChangeForMSC*     fParticleChange;

  G4SafetyHelper*             safetyHelper;
  G4PhysicsTable*             theLambdaTable;
  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   isInitialized;
  G4bool   inside;
  G4bool   insideskin;

};

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inline
G4double G4UrbanMscModel90::GetLambda(G4double e)
{
  G4double x;
  if(theLambdaTable) {
    G4bool b;
    x = ((*theLambdaTable)[currentMaterialIndex])->GetValue(e, b);
  } else {
    x = CrossSection(couple,particle,e);
  }
  if(x > DBL_MIN) x = 1./x;
  else            x = DBL_MAX;
  return x;
}

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inline
void G4UrbanMscModel90::SetParticle(const G4ParticleDefinition* p)
{
  if (p != particle) {
    particle = p;
    mass = p->GetPDGMass();
    charge = p->GetPDGCharge()/eplus;
  }
}

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#endif