G4eDPWACoulombScatteringModel Class Reference

#include <G4eDPWACoulombScatteringModel.hh>

Inheritance diagram for G4eDPWACoulombScatteringModel:

Public Member Functions
	G4eDPWACoulombScatteringModel (G4bool ismixed=false, G4bool isscpcor=true, G4double mumin=0.0)
	~G4eDPWACoulombScatteringModel () override
void	Initialise (const G4ParticleDefinition *, const G4DataVector &) override
void	InitialiseLocal (const G4ParticleDefinition *, G4VEmModel *) override
G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double ekin, G4double Z, G4double A, G4double prodcut, G4double emax) override
void	SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy) override
G4double	MinPrimaryEnergy (const G4Material *, const G4ParticleDefinition *, G4double) override
void	SetTheDCS (G4eDPWAElasticDCS *theDCS)
G4eDPWAElasticDCS *	GetTheDCS ()
Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)
virtual	~G4VEmModel ()
virtual void	InitialiseForMaterial (const G4ParticleDefinition *, const G4Material *)
virtual void	InitialiseForElement (const G4ParticleDefinition *, G4int Z)
virtual G4double	ComputeDEDXPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=DBL_MAX)
virtual G4double	CrossSectionPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
virtual G4double	GetPartialCrossSection (const G4Material *, G4int level, const G4ParticleDefinition *, G4double kineticEnergy)
virtual G4double	ComputeCrossSectionPerShell (const G4ParticleDefinition *, G4int Z, G4int shellIdx, G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
virtual G4double	ChargeSquareRatio (const G4Track &)
virtual G4double	GetChargeSquareRatio (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
virtual G4double	GetParticleCharge (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
virtual void	StartTracking (G4Track *)
virtual void	CorrectionsAlongStep (const G4MaterialCutsCouple *, const G4DynamicParticle *, const G4double &length, G4double &eloss)
virtual G4double	Value (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy)
virtual G4double	MinEnergyCut (const G4ParticleDefinition *, const G4MaterialCutsCouple *)
virtual void	SetupForMaterial (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
virtual void	DefineForRegion (const G4Region *)
virtual void	FillNumberOfSecondaries (G4int &numberOfTriplets, G4int &numberOfRecoil)
virtual void	ModelDescription (std::ostream &outFile) const
void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)
std::vector< G4EmElementSelector * > *	GetElementSelectors ()
void	SetElementSelectors (std::vector< G4EmElementSelector * > *)
G4double	ComputeDEDX (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=DBL_MAX)
G4double	CrossSection (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
G4double	ComputeMeanFreePath (const G4ParticleDefinition *, G4double kineticEnergy, const G4Material *, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, const G4Element *, G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
const G4Element *	SelectRandomAtom (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
const G4Element *	SelectTargetAtom (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double logKineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
const G4Element *	SelectRandomAtom (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
const G4Element *	GetCurrentElement (const G4Material *mat=nullptr) const
G4int	SelectRandomAtomNumber (const G4Material *) const
const G4Isotope *	GetCurrentIsotope (const G4Element *elm=nullptr) const
G4int	SelectIsotopeNumber (const G4Element *) const
void	SetParticleChange (G4VParticleChange *, G4VEmFluctuationModel *f=nullptr)
void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)
G4ElementData *	GetElementData ()
G4PhysicsTable *	GetCrossSectionTable ()
G4VEmFluctuationModel *	GetModelOfFluctuations ()
G4VEmAngularDistribution *	GetAngularDistribution ()
G4VEmModel *	GetTripletModel ()
void	SetTripletModel (G4VEmModel *)
void	SetAngularDistribution (G4VEmAngularDistribution *)
G4double	HighEnergyLimit () const
G4double	LowEnergyLimit () const
G4double	HighEnergyActivationLimit () const
G4double	LowEnergyActivationLimit () const
G4double	PolarAngleLimit () const
G4double	SecondaryThreshold () const
G4bool	DeexcitationFlag () const
G4bool	ForceBuildTableFlag () const
G4bool	UseAngularGeneratorFlag () const
void	SetAngularGeneratorFlag (G4bool)
void	SetHighEnergyLimit (G4double)
void	SetLowEnergyLimit (G4double)
void	SetActivationHighEnergyLimit (G4double)
void	SetActivationLowEnergyLimit (G4double)
G4bool	IsActive (G4double kinEnergy) const
void	SetPolarAngleLimit (G4double)
void	SetSecondaryThreshold (G4double)
void	SetDeexcitationFlag (G4bool val)
void	SetForceBuildTable (G4bool val)
void	SetFluctuationFlag (G4bool val)
void	SetMasterThread (G4bool val)
G4bool	IsMaster () const
void	SetUseBaseMaterials (G4bool val)
G4bool	UseBaseMaterials () const
G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)
const G4String &	GetName () const
void	SetCurrentCouple (const G4MaterialCutsCouple *)
G4bool	IsLocked () const
void	SetLocked (G4bool)
void	SetLPMFlag (G4bool)
G4VEmModel &	operator= (const G4VEmModel &right)=delete
	G4VEmModel (const G4VEmModel &)=delete

Additional Inherited Members
Protected Member Functions inherited from G4VEmModel
G4ParticleChangeForLoss *	GetParticleChangeForLoss ()
G4ParticleChangeForGamma *	GetParticleChangeForGamma ()
virtual G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kineticEnergy)
const G4MaterialCutsCouple *	CurrentCouple () const
void	SetCurrentElement (const G4Element *)
Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData = nullptr
G4VParticleChange *	pParticleChange = nullptr
G4PhysicsTable *	xSectionTable = nullptr
const G4Material *	pBaseMaterial = nullptr
const std::vector< G4double > *	theDensityFactor = nullptr
const std::vector< G4int > *	theDensityIdx = nullptr
G4double	inveplus
G4double	pFactor = 1.0
std::size_t	currentCoupleIndex = 0
std::size_t	basedCoupleIndex = 0
G4bool	lossFlucFlag = true

Detailed Description

Definition at line 68 of file G4eDPWACoulombScatteringModel.hh.

Constructor & Destructor Documentation

G4eDPWACoulombScatteringModel()

G4eDPWACoulombScatteringModel::G4eDPWACoulombScatteringModel	(	G4bool	ismixed = false,
		G4bool	isscpcor = true,
		G4double	mumin = 0.0 )

Constructor.

Parameters

[in]	ismixed	Indicates if the model is for mixed or for pure single Coulomb scattering. Different type of tables are pre- pared for sampling polar angle of Coulomb scattering for mixed and for pure single scattering models: cosine of the polar scattering angle can be sampled in a restriced inteval (see mumin input parameter below).
[in]	isscpcor	Indicates if scattering power correction should be used. Note, scattering power correction accounts the effects angular deflections due to sub-threshold ionisations when ionisation is described by using condensed history model (should be active only in this case).
[in]	mumin	When the model is used for mixed simulation, Coulomb scatterings, resulting in a minimum t_c polar angular deflection, modelled explicitly. Therefore, cross sections are computed, and angular deflections are sampled ina resricted [\theta_c,\pi] interval. The minimum of this interval is determined by the mumin parameter as: \mu_{min} = \mu(\theta_c)=0.5[1-\cos(\theta_c)]

Definition at line 62 of file G4eDPWACoulombScatteringModel.cc.

: G4VEmModel("eDPWACoulombScattering"),
  fIsMixedModel(ismixed),
  fIsScpCorrection(isscpcor),
  fMuMin(mumin),
  fTheDCS(nullptr),
  fParticleChange(nullptr)
{
  SetLowEnergyLimit (  0.0*CLHEP::eV);  // ekin = 10 eV   is used if (E< 10  eV)
  SetHighEnergyLimit(100.0*CLHEP::MeV); // ekin = 100 MeV is used if (E>100 MeV)
}

~G4eDPWACoulombScatteringModel()

G4eDPWACoulombScatteringModel::~G4eDPWACoulombScatteringModel ( )

override

Definition at line 75 of file G4eDPWACoulombScatteringModel.cc.

{
  if (IsMaster()) {
    delete fTheDCS;
  }
}

Member Function Documentation

ComputeCrossSectionPerAtom()

G4double G4eDPWACoulombScatteringModel::ComputeCrossSectionPerAtom ( const G4ParticleDefinition * , G4double ekin, G4double Z, G4double A, G4double prodcut, G4double emax )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 125 of file G4eDPWACoulombScatteringModel.cc.

{
  // Cross sections are computed by numerical integration of the pre-computed
  // DCS data between the muMin, muMax limits where mu(theta)=0.5[1-cos(theta)].
  // In case of single scattering model (i.e. when fMuMin=0): [muMin=0, muMax=1]
  // In case of mixed simulation model  (i.e. when fMuMin>0): [fMuMin , muMax=1]
  // NOTE: cross sections will be zero if the kinetic enrgy is out of the
  //       [10 eV-100 MeV] range for which DCS data has been computed.
  //
  G4double elCS  = 0.0;          // elastic cross section
  G4double tr1CS = 0.0;          // first transport cross section
  G4double tr2CS = 0.0;          // second transport cross section
  const G4double muMin = fMuMin;
  const G4double muMax = 1.0;
  fTheDCS->ComputeCSPerAtom((G4int)Z, ekin, elCS, tr1CS, tr2CS, muMin, muMax);
  // scattering power correction: should be only in condensed history ioni!
  if (fIsScpCorrection && CurrentCouple()) {
    const G4double theScpCor = fTheDCS->ComputeScatteringPowerCorrection(CurrentCouple(), ekin);
    elCS *= (theScpCor*(1.0+1.0/Z));
  }
  return std::max(0.0, elCS);
}

GetTheDCS()

G4eDPWAElasticDCS * G4eDPWACoulombScatteringModel::GetTheDCS ( )

inline

Definition at line 122 of file G4eDPWACoulombScatteringModel.hh.

{ return fTheDCS; }

Referenced by InitialiseLocal().

Initialise()

void G4eDPWACoulombScatteringModel::Initialise ( const G4ParticleDefinition * pdef, const G4DataVector & prodcuts )

overridevirtual

Implements G4VEmModel.

Definition at line 83 of file G4eDPWACoulombScatteringModel.cc.

{
  if(!fParticleChange) {
    fParticleChange = GetParticleChangeForGamma();
  }
  fMuMin        = 0.5*(1.0-std::cos(PolarAngleLimit()));
  fIsMixedModel = (fMuMin > 0.0);
  if(IsMaster()) {
    // clean the G4eDPWAElasticDCS object if any
    delete fTheDCS;
    fTheDCS = new G4eDPWAElasticDCS(pdef==G4Electron::Electron(), fIsMixedModel);
    // init only for the elements that are used in the geometry
    G4ProductionCutsTable* theCpTable = G4ProductionCutsTable::GetProductionCutsTable();
    G4int numOfCouples = (G4int)theCpTable->GetTableSize();
    for(G4int j=0; j<numOfCouples; ++j) {
      const G4Material* mat = theCpTable->GetMaterialCutsCouple(j)->GetMaterial();
      const G4ElementVector* elV = mat->GetElementVector();
      std::size_t numOfElem = mat->GetNumberOfElements();
      for (std::size_t ie = 0; ie < numOfElem; ++ie) {
        fTheDCS->InitialiseForZ((*elV)[ie]->GetZasInt());
      }
    }
    // init scattering power correction
    if (fIsScpCorrection) {
      fTheDCS->InitSCPCorrection(LowEnergyLimit(), HighEnergyLimit());
    }
    // will make use of the cross sections so the above needs to be done before
    InitialiseElementSelectors(pdef, prodcuts);
  }
}

InitialiseLocal()

void G4eDPWACoulombScatteringModel::InitialiseLocal ( const G4ParticleDefinition * , G4VEmModel * masterModel )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 116 of file G4eDPWACoulombScatteringModel.cc.

{
  SetElementSelectors(masterModel->GetElementSelectors());
  SetTheDCS(static_cast<G4eDPWACoulombScatteringModel*>(masterModel)->GetTheDCS());
}

MinPrimaryEnergy()

G4double G4eDPWACoulombScatteringModel::MinPrimaryEnergy ( const G4Material * , const G4ParticleDefinition * , G4double  )

inlineoverridevirtual

Reimplemented from G4VEmModel.

Definition at line 117 of file G4eDPWACoulombScatteringModel.hh.

                                               { return 10.0*CLHEP::eV; }

SampleSecondaries()

void G4eDPWACoulombScatteringModel::SampleSecondaries ( std::vector< G4DynamicParticle * > * , const G4MaterialCutsCouple * cp, const G4DynamicParticle * dp, G4double tmin, G4double maxEnergy )

overridevirtual

Implements G4VEmModel.

Definition at line 155 of file G4eDPWACoulombScatteringModel.cc.

{
  const G4double    ekin   = dp->GetKineticEnergy();
  const G4double    lekin  = dp->GetLogKineticEnergy();
  const G4Element*  target = SelectTargetAtom(cp, dp->GetParticleDefinition(), ekin, lekin);
  const G4int       izet   = target->GetZasInt();
  // sample cosine of the polar scattering angle in (hard) elastic insteraction
  CLHEP::HepRandomEngine* rndmEngine = G4Random::getTheEngine();
  G4double cost = 1.0;
  if (!fIsMixedModel) {
    G4double rndm[3];
    rndmEngine->flatArray(3, rndm);
    cost = fTheDCS->SampleCosineTheta(izet, lekin, rndm[0], rndm[1], rndm[2]);
  } else {
    //sample cost between costMax,costMin where costMax = 1-2xfMuMin;
    const G4double costMax = 1.0-2.0*fMuMin;
    const G4double costMin = -1.0;
    G4double rndm[2];
    rndmEngine->flatArray(2, rndm);
    cost = fTheDCS->SampleCosineThetaRestricted(izet, lekin, rndm[0], rndm[1], costMin, costMax);
  }
  // compute the new direction in the scattering frame
  const G4double sint = std::sqrt((1.0-cost)*(1.0+cost));
  const G4double phi  = CLHEP::twopi*rndmEngine->flat();
  G4ThreeVector theNewDirection(sint*std::cos(phi), sint*std::sin(phi), cost);
  // get original direction in lab frame and rotate new direction to lab frame
  G4ThreeVector theOrgDirectionLab = dp->GetMomentumDirection();
  theNewDirection.rotateUz(theOrgDirectionLab);
  // set new direction
  fParticleChange->ProposeMomentumDirection(theNewDirection);
}

SetTheDCS()

void G4eDPWACoulombScatteringModel::SetTheDCS ( G4eDPWAElasticDCS * theDCS )

inline

Definition at line 120 of file G4eDPWACoulombScatteringModel.hh.

{ fTheDCS = theDCS; }

Referenced by InitialiseLocal().

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The documentation for this class was generated from the following files:

• G4eDPWACoulombScatteringModel.hh
• G4eDPWACoulombScatteringModel.cc