G4mplIonisationModel Class Reference

#include <G4mplIonisationModel.hh>

Inheritance diagram for G4mplIonisationModel:

Public Member Functions
	G4mplIonisationModel (G4double mCharge, const G4String &nam="mplIonisation")
virtual	~G4mplIonisationModel ()
virtual void	Initialise (const G4ParticleDefinition *, const G4DataVector &)
virtual G4double	ComputeDEDXPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy)
virtual void	SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy)
virtual G4double	SampleFluctuations (const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmax, G4double length, G4double meanLoss)
virtual G4double	Dispersion (const G4Material *, const G4DynamicParticle *, G4double tmax, G4double length)
void	SetParticle (const G4ParticleDefinition *p)
Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)
virtual	~G4VEmModel ()
virtual void	InitialiseLocal (const G4ParticleDefinition *, G4VEmModel *masterModel)
virtual void	InitialiseForMaterial (const G4ParticleDefinition *, const G4Material *)
virtual void	InitialiseForElement (const G4ParticleDefinition *, G4int Z)
virtual G4double	CrossSectionPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., 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 *, G4double &eloss, G4double &niel, G4double length)
virtual G4double	Value (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy)
virtual G4double	MinPrimaryEnergy (const G4Material *, const G4ParticleDefinition *, G4double cut=0.0)
virtual G4double	MinEnergyCut (const G4ParticleDefinition *, const G4MaterialCutsCouple *)
virtual void	SetupForMaterial (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
virtual void	DefineForRegion (const G4Region *)
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)
G4int	SelectIsotopeNumber (const G4Element *)
const G4Element *	SelectRandomAtom (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, 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)
G4int	SelectRandomAtomNumber (const G4Material *)
void	SetParticleChange (G4VParticleChange *, G4VEmFluctuationModel *f=0)
void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)
G4ElementData *	GetElementData ()
G4PhysicsTable *	GetCrossSectionTable ()
G4VEmFluctuationModel *	GetModelOfFluctuations ()
G4VEmAngularDistribution *	GetAngularDistribution ()
void	SetAngularDistribution (G4VEmAngularDistribution *)
G4double	HighEnergyLimit () const
G4double	LowEnergyLimit () const
G4double	HighEnergyActivationLimit () const
G4double	LowEnergyActivationLimit () const
G4double	PolarAngleLimit () const
G4double	SecondaryThreshold () const
G4bool	LPMFlag () 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)
void	SetPolarAngleLimit (G4double)
void	SetSecondaryThreshold (G4double)
void	SetLPMFlag (G4bool val)
void	SetDeexcitationFlag (G4bool val)
void	SetForceBuildTable (G4bool val)
void	SetMasterThread (G4bool val)
G4bool	IsMaster () const
G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)
const G4String &	GetName () const
void	SetCurrentCouple (const G4MaterialCutsCouple *)
const G4Element *	GetCurrentElement () const
Public Member Functions inherited from G4VEmFluctuationModel
	G4VEmFluctuationModel (const G4String &nam)
virtual	~G4VEmFluctuationModel ()
virtual void	InitialiseMe (const G4ParticleDefinition *)
virtual void	SetParticleAndCharge (const G4ParticleDefinition *, G4double q2)
G4String	GetName () const

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
G4VParticleChange *	pParticleChange
G4PhysicsTable *	xSectionTable
const std::vector< G4double > *	theDensityFactor
const std::vector< G4int > *	theDensityIdx
size_t	idxTable

Detailed Description

Definition at line 58 of file G4mplIonisationModel.hh.

Constructor & Destructor Documentation

G4mplIonisationModel::G4mplIonisationModel	(	G4double	mCharge,
		const G4String &	nam = "mplIonisation"
	)

Definition at line 72 of file G4mplIonisationModel.cc.

References python.hepunit::cm2, python.hepunit::electron_mass_c2, python.hepunit::fine_structure_const, g(), python.hepunit::GeV, python.hepunit::hbarc, and python.hepunit::pi.

  : G4VEmModel(nam),G4VEmFluctuationModel(nam),
  magCharge(mCharge),
  twoln10(log(100.0)),
  betalow(0.01),
  betalim(0.1),
  beta2lim(betalim*betalim),
  bg2lim(beta2lim*(1.0 + beta2lim))
{
  nmpl         = G4int(abs(magCharge) * 2 * fine_structure_const + 0.5);
  if(nmpl > 6)      { nmpl = 6; }
  else if(nmpl < 1) { nmpl = 1; }
  pi_hbarc2_over_mc2 = pi * hbarc * hbarc / electron_mass_c2;
  chargeSquare = magCharge * magCharge;
  dedxlim = 45.*nmpl*nmpl*GeV*cm2/g;
  fParticleChange = 0;
  monopole = 0;
  mass = 0.0;
}

G4mplIonisationModel::~G4mplIonisationModel ( )

virtual

Definition at line 94 of file G4mplIonisationModel.cc.

References G4VEmModel::IsMaster().

{
  if(IsMaster()) { delete dedx0; }
}

Member Function Documentation

G4double G4mplIonisationModel::ComputeDEDXPerVolume ( const G4Material *  material, const G4ParticleDefinition *  p, G4double  kineticEnergy, G4double  cutEnergy  )

virtual

Reimplemented from G4VEmModel.

Definition at line 143 of file G4mplIonisationModel.cc.

References G4VEmModel::CurrentCouple(), G4InuclParticleNames::gam, G4MaterialCutsCouple::GetIndex(), and SetParticle().

{
  if(!monopole) { SetParticle(p); }
  G4double tau   = kineticEnergy / mass;
  G4double gam   = tau + 1.0;
  G4double bg2   = tau * (tau + 2.0);
  G4double beta2 = bg2 / (gam * gam);
  G4double beta  = sqrt(beta2);

  // low-energy asymptotic formula
  //G4double dedx  = dedxlim*beta*material->GetDensity();
  G4double dedx = (*dedx0)[CurrentCouple()->GetIndex()]*beta;

  // above asymptotic
  if(beta > betalow) {

    // high energy
    if(beta >= betalim) {
      dedx = ComputeDEDXAhlen(material, bg2);

    } else {

      //G4double dedx1 = dedxlim*betalow*material->GetDensity();
      G4double dedx1 = (*dedx0)[CurrentCouple()->GetIndex()]*betalow;
      G4double dedx2 = ComputeDEDXAhlen(material, bg2lim);

      // extrapolation between two formula 
      G4double kapa2 = beta - betalow;
      G4double kapa1 = betalim - beta;
      dedx = (kapa1*dedx1 + kapa2*dedx2)/(kapa1 + kapa2);
    }
  }
  return dedx;
}

G4double G4mplIonisationModel::Dispersion ( const G4Material *  material, const G4DynamicParticle *  dp, G4double  tmax, G4double  length  )

virtual

Implements G4VEmFluctuationModel.

Definition at line 261 of file G4mplIonisationModel.cc.

References G4InuclParticleNames::gam, G4Material::GetElectronDensity(), G4DynamicParticle::GetKineticEnergy(), and python.hepunit::twopi_mc2_rcl2.

Referenced by SampleFluctuations().

{
  G4double siga = 0.0;
  G4double tau   = dp->GetKineticEnergy()/mass;
  if(tau > 0.0) { 
    G4double electronDensity = material->GetElectronDensity();
    G4double gam   = tau + 1.0;
    G4double invbeta2 = (gam*gam)/(tau * (tau+2.0));
    siga  = (invbeta2 - 0.5) * twopi_mc2_rcl2 * tmax * length
      * electronDensity * chargeSquare;
  }
  return siga;
}

void G4mplIonisationModel::Initialise ( const G4ParticleDefinition *  p, const G4DataVector &    )

virtual

Implements G4VEmModel.

Definition at line 115 of file G4mplIonisationModel.cc.

References python.hepunit::electron_Compton_length, python.hepunit::fine_structure_const, G4Log(), G4Material::GetElectronDensity(), G4MaterialCutsCouple::GetMaterial(), G4ProductionCutsTable::GetMaterialCutsCouple(), G4VEmModel::GetParticleChangeForLoss(), G4ProductionCutsTable::GetProductionCutsTable(), G4ProductionCutsTable::GetTableSize(), G4VEmModel::IsMaster(), eplot::material, n, python.hepunit::pi, and SetParticle().

{
  if(!monopole) { SetParticle(p); }
  if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
  if(IsMaster()) {
    if(!dedx0) { dedx0 = new std::vector<G4double>; }
    G4ProductionCutsTable* theCoupleTable=
      G4ProductionCutsTable::GetProductionCutsTable();
    G4int numOfCouples = theCoupleTable->GetTableSize();
    G4int n = dedx0->size();
    if(n < numOfCouples) { dedx0->resize(numOfCouples); }

    // initialise vector
    for(G4int i=0; i<numOfCouples; ++i) {

      const G4Material* material = 
    theCoupleTable->GetMaterialCutsCouple(i)->GetMaterial();
      G4double eDensity = material->GetElectronDensity();
      G4double vF = electron_Compton_length*pow(3*pi*pi*eDensity,0.3333333333);
      (*dedx0)[i] = pi_hbarc2_over_mc2*eDensity*nmpl*nmpl*
    (G4Log(2*vF/fine_structure_const) - 0.5)/vF;
    }
  }
}

G4double G4mplIonisationModel::SampleFluctuations ( const G4MaterialCutsCouple *  couple, const G4DynamicParticle *  dp, G4double  tmax, G4double  length, G4double  meanLoss  )

virtual

Implements G4VEmFluctuationModel.

Definition at line 233 of file G4mplIonisationModel.cc.

References Dispersion(), G4UniformRand, G4MaterialCutsCouple::GetMaterial(), G4INCL::DeJongSpin::shoot(), and test::x.

{
  G4double siga = Dispersion(couple->GetMaterial(),dp,tmax,length);
  G4double loss = meanLoss;
  siga = sqrt(siga);
  G4double twomeanLoss = meanLoss + meanLoss;

  if(twomeanLoss < siga) {
    G4double x;
    do {
      loss = twomeanLoss*G4UniformRand();
      x = (loss - meanLoss)/siga;
    } while (1.0 - 0.5*x*x < G4UniformRand());
  } else {
    do {
      loss = G4RandGauss::shoot(meanLoss,siga);
    } while (0.0 > loss || loss > twomeanLoss);
  }
  return loss;
}

void G4mplIonisationModel::SampleSecondaries ( std::vector< G4DynamicParticle * > *  , const G4MaterialCutsCouple *  , const G4DynamicParticle *  , G4double  tmin, G4double  maxEnergy  )

virtual

Implements G4VEmModel.

Definition at line 224 of file G4mplIonisationModel.cc.

{}

void G4mplIonisationModel::SetParticle

(

const G4ParticleDefinition *

p

)

Definition at line 101 of file G4mplIonisationModel.cc.

References G4ParticleDefinition::GetPDGMass(), G4VEmModel::HighEnergyLimit(), G4VEmModel::LowEnergyLimit(), G4INCL::Math::max(), G4INCL::Math::min(), G4VEmModel::SetHighEnergyLimit(), and G4VEmModel::SetLowEnergyLimit().

Referenced by ComputeDEDXPerVolume(), and Initialise().

{
  monopole = p;
  mass     = monopole->GetPDGMass();
  G4double emin = 
    std::min(LowEnergyLimit(),0.1*mass*(1/sqrt(1 - betalow*betalow) - 1)); 
  G4double emax = 
    std::max(HighEnergyLimit(),10*mass*(1/sqrt(1 - beta2lim) - 1)); 
  SetLowEnergyLimit(emin);
  SetHighEnergyLimit(emax);
}

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

• G4mplIonisationModel.hh
• G4mplIonisationModel.cc