G4mplIonisationWithDeltaModel Class Reference

#include <G4mplIonisationWithDeltaModel.hh>

Inheritance diagram for G4mplIonisationWithDeltaModel:

Public Member Functions
	G4mplIonisationWithDeltaModel (G4double mCharge, const G4String &nam="mplIonisationWithDelta")
virtual	~G4mplIonisationWithDeltaModel ()
virtual void	Initialise (const G4ParticleDefinition *, const G4DataVector &) override
virtual G4double	ComputeDEDXPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy) override
virtual G4double	ComputeCrossSectionPerElectron (const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy, G4double maxEnergy)
virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kineticEnergy, G4double Z, G4double A, G4double cutEnergy, G4double maxEnergy) override
virtual void	SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy) override
virtual G4double	SampleFluctuations (const G4MaterialCutsCouple *, const G4DynamicParticle *, const G4double tcut, const G4double tmax, const G4double length, const G4double meanLoss) override
virtual G4double	Dispersion (const G4Material *, const G4DynamicParticle *, const G4double tcut, const G4double tmax, const G4double length) override
virtual G4double	MinEnergyCut (const G4ParticleDefinition *, const G4MaterialCutsCouple *couple) override
void	SetParticle (const G4ParticleDefinition *p)
Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)
virtual	~G4VEmModel ()
virtual void	Initialise (const G4ParticleDefinition *, const G4DataVector &)=0
virtual void	SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin=0.0, G4double tmax=DBL_MAX)=0
virtual void	InitialiseLocal (const G4ParticleDefinition *, G4VEmModel *masterModel)
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	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
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	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 *)
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	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) const
void	SetPolarAngleLimit (G4double)
void	SetSecondaryThreshold (G4double)
void	SetLPMFlag (G4bool val)
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)
G4VEmModel &	operator= (const G4VEmModel &right)=delete
	G4VEmModel (const G4VEmModel &)=delete
Public Member Functions inherited from G4VEmFluctuationModel
	G4VEmFluctuationModel (const G4String &nam)
virtual	~G4VEmFluctuationModel ()
virtual G4double	SampleFluctuations (const G4MaterialCutsCouple *, const G4DynamicParticle *, const G4double tcut, const G4double tmax, const G4double length, const G4double meanLoss)=0
virtual G4double	Dispersion (const G4Material *, const G4DynamicParticle *, const G4double tcut, const G4double tmax, const G4double length)=0
virtual void	InitialiseMe (const G4ParticleDefinition *)
virtual void	SetParticleAndCharge (const G4ParticleDefinition *, G4double q2)
const G4String &	GetName () const
G4VEmFluctuationModel &	operator= (const G4VEmFluctuationModel &right)=delete
	G4VEmFluctuationModel (const G4VEmFluctuationModel &)=delete

Protected Member Functions
virtual G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kinEnergy) override
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 *)

Additional Inherited Members
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
size_t	currentCoupleIndex = 0
size_t	basedCoupleIndex = 0
G4bool	lossFlucFlag = true

Detailed Description

Definition at line 57 of file G4mplIonisationWithDeltaModel.hh.

Constructor & Destructor Documentation

G4mplIonisationWithDeltaModel()

G4mplIonisationWithDeltaModel::G4mplIonisationWithDeltaModel ( G4double  mCharge, const G4String &  nam = "mplIonisationWithDelta"  )

explicit

Definition at line 73 of file G4mplIonisationWithDeltaModel.cc.

  : G4VEmModel(nam),G4VEmFluctuationModel(nam),
  magCharge(mCharge),
  twoln10(std::log(100.0)),
  betalow(0.01),
  betalim(0.1),
  beta2lim(betalim*betalim),
  bg2lim(beta2lim*(1.0 + beta2lim))
{
  nmpl = G4lrint(std::abs(magCharge) * 2 * fine_structure_const);
  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 = nullptr;
  theElectron = G4Electron::Electron();
  G4cout << "### Monopole ionisation model with d-electron production, Gmag= " 
         << magCharge/eplus << G4endl;
  monopole = nullptr;
  mass = 0.0;
}

~G4mplIonisationWithDeltaModel()

G4mplIonisationWithDeltaModel::~G4mplIonisationWithDeltaModel ( )

virtual

Definition at line 99 of file G4mplIonisationWithDeltaModel.cc.

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

Member Function Documentation

ComputeCrossSectionPerAtom()

G4double G4mplIonisationWithDeltaModel::ComputeCrossSectionPerAtom ( const G4ParticleDefinition *  p, G4double  kineticEnergy, G4double  Z, G4double  A, G4double  cutEnergy, G4double  maxEnergy  )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 253 of file G4mplIonisationWithDeltaModel.cc.

{
  G4double cross = 
    Z*ComputeCrossSectionPerElectron(p,kineticEnergy,cutEnergy,maxEnergy);
  return cross;
}

ComputeCrossSectionPerElectron()

G4double G4mplIonisationWithDeltaModel::ComputeCrossSectionPerElectron ( const G4ParticleDefinition *  p, G4double  kineticEnergy, G4double  cutEnergy, G4double  maxEnergy  )

virtual

Definition at line 235 of file G4mplIonisationWithDeltaModel.cc.

{
  if(!monopole) { SetParticle(p); }
  G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
  G4double maxEnergy = std::min(tmax, maxKinEnergy);
  G4double cutEnergy = std::max(LowEnergyLimit(), cut);
  G4double cross = (cutEnergy < maxEnergy) 
    ? (0.5/cutEnergy - 0.5/maxEnergy)*pi_hbarc2_over_mc2 * nmpl * nmpl : 0.0;
  return cross;
}

Referenced by ComputeCrossSectionPerAtom().

ComputeDEDXPerVolume()

G4double G4mplIonisationWithDeltaModel::ComputeDEDXPerVolume ( const G4Material *  material, const G4ParticleDefinition *  p, G4double  kineticEnergy, G4double  cutEnergy  )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 160 of file G4mplIonisationWithDeltaModel.cc.

{
  if(!monopole) { SetParticle(p); }
  G4double tmax = MaxSecondaryEnergy(p,kineticEnergy);
  G4double cutEnergy = std::min(tmax, maxEnergy);
  cutEnergy = std::max(LowEnergyLimit(), cutEnergy);
  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 = (*dedx0)[CurrentCouple()->GetIndex()]*beta;
 
  // above asymptotic
  if(beta > betalow) {
 
    // high energy
    if(beta >= betalim) {
      dedx = ComputeDEDXAhlen(material, bg2, cutEnergy);
 
    } else {
      G4double dedx1 = (*dedx0)[CurrentCouple()->GetIndex()]*betalow;
      G4double dedx2 = ComputeDEDXAhlen(material, bg2lim, cutEnergy);
 
      // extrapolation between two formula 
      G4double kapa2 = beta - betalow;
      G4double kapa1 = betalim - beta;
      dedx = (kapa1*dedx1 + kapa2*dedx2)/(kapa1 + kapa2);
    }
  }
  return dedx;
}

Dispersion()

G4double G4mplIonisationWithDeltaModel::Dispersion ( const G4Material *  material, const G4DynamicParticle *  dp, const G4double  tcut, const G4double  tmax, const G4double  length  )

overridevirtual

Implements G4VEmFluctuationModel.

Definition at line 358 of file G4mplIonisationWithDeltaModel.cc.

{
  G4double siga = 0.0;
  G4double tau   = dp->GetKineticEnergy()/mass;
  if(tau > 0.0) { 
    const G4double beta = dp->GetBeta();
    siga  = (tmax/(beta*beta) - 0.5*tcut) * twopi_mc2_rcl2 * length
      * material->GetElectronDensity() * chargeSquare;
  }
  return siga;
}

Referenced by SampleFluctuations().

Initialise()

void G4mplIonisationWithDeltaModel::Initialise ( const G4ParticleDefinition *  p, const G4DataVector &    )

overridevirtual

Implements G4VEmModel.

Definition at line 121 of file G4mplIonisationWithDeltaModel.cc.

{
  if(!monopole) { SetParticle(p); }
  if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
  if(IsMaster()) {
    if(!dedx0) { dedx0 = new std::vector<G4double>; }
    G4ProductionCutsTable* theCoupleTable=
      G4ProductionCutsTable::GetProductionCutsTable();
    G4int numOfCouples = (G4int)theCoupleTable->GetTableSize();
    G4int n = (G4int)dedx0->size();
    if(n < numOfCouples) { dedx0->resize(numOfCouples); }
    G4Pow* g4calc = G4Pow::GetInstance();
 
    // initialise vector assuming low conductivity
    for(G4int i=0; i<numOfCouples; ++i) {
 
      const G4Material* material = 
        theCoupleTable->GetMaterialCutsCouple(i)->GetMaterial();
      G4double eDensity = material->GetElectronDensity();
      G4double vF2 = 2*electron_Compton_length*g4calc->A13(3.*pi*pi*eDensity);
      (*dedx0)[i] = pi_hbarc2_over_mc2*eDensity*nmpl*nmpl*
        (G4Log(vF2/fine_structure_const) - 0.5)/vF2;
    }
  }
}

MaxSecondaryEnergy()

G4double G4mplIonisationWithDeltaModel::MaxSecondaryEnergy ( const G4ParticleDefinition *  , G4double  kinEnergy  )

overrideprotectedvirtual

Reimplemented from G4VEmModel.

Definition at line 377 of file G4mplIonisationWithDeltaModel.cc.

{
  G4double tau = kinEnergy/mass;
  return 2.0*electron_mass_c2*tau*(tau + 2.);
}

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), and SampleSecondaries().

MinEnergyCut()

G4double G4mplIonisationWithDeltaModel::MinEnergyCut ( const G4ParticleDefinition *  , const G4MaterialCutsCouple *  couple  )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 151 of file G4mplIonisationWithDeltaModel.cc.

{
  return couple->GetMaterial()->GetIonisation()->GetMeanExcitationEnergy();
}

SampleFluctuations()

G4double G4mplIonisationWithDeltaModel::SampleFluctuations ( const G4MaterialCutsCouple *  couple, const G4DynamicParticle *  dp, const G4double  tcut, const G4double  tmax, const G4double  length, const G4double  meanLoss  )

overridevirtual

Implements G4VEmFluctuationModel.

Definition at line 326 of file G4mplIonisationWithDeltaModel.cc.

{
  G4double siga = Dispersion(couple->GetMaterial(),dp,tcut,tmax,length);
  G4double loss = meanLoss;
  siga = std::sqrt(siga);
  G4double twomeanLoss = meanLoss + meanLoss;
 
  if(twomeanLoss < siga) {
    G4double x;
    do {
      loss = twomeanLoss*G4UniformRand();
      x = (loss - meanLoss)/siga;
      // Loop checking, 07-Aug-2015, Vladimir Ivanchenko
    } while (1.0 - 0.5*x*x < G4UniformRand());
  } else {
    do {
      loss = G4RandGauss::shoot(meanLoss,siga);
      // Loop checking, 07-Aug-2015, Vladimir Ivanchenko
    } while (0.0 > loss || loss > twomeanLoss);
  }
  return loss;
}

SampleSecondaries()

void G4mplIonisationWithDeltaModel::SampleSecondaries ( std::vector< G4DynamicParticle * > *  vdp, const G4MaterialCutsCouple *  , const G4DynamicParticle *  dp, G4double  tmin, G4double  maxEnergy  )

overridevirtual

Implements G4VEmModel.

Definition at line 268 of file G4mplIonisationWithDeltaModel.cc.

{
  G4double kineticEnergy = dp->GetKineticEnergy();
  G4double tmax = MaxSecondaryEnergy(dp->GetDefinition(),kineticEnergy);
 
  G4double maxKinEnergy = std::min(maxEnergy,tmax);
  if(minKinEnergy >= maxKinEnergy) { return; }
 
  //G4cout << "G4mplIonisationWithDeltaModel::SampleSecondaries: E(GeV)= "
  //         << kineticEnergy/GeV << " M(GeV)= " << mass/GeV
  //         << " tmin(MeV)= " << minKinEnergy/MeV << G4endl;
 
  G4double totEnergy     = kineticEnergy + mass;
  G4double etot2         = totEnergy*totEnergy;
  G4double beta2         = kineticEnergy*(kineticEnergy + 2.0*mass)/etot2;
  
  // sampling without nuclear size effect
  G4double q = G4UniformRand();
  G4double deltaKinEnergy = minKinEnergy*maxKinEnergy
    /(minKinEnergy*(1.0 - q) + maxKinEnergy*q);
 
  // delta-electron is produced
  G4double totMomentum = totEnergy*sqrt(beta2);
  G4double deltaMomentum =
           sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
  G4double cost = deltaKinEnergy * (totEnergy + electron_mass_c2) /
                                   (deltaMomentum * totMomentum);
  cost = std::min(cost, 1.0);
 
  G4double sint = sqrt((1.0 - cost)*(1.0 + cost));
 
  G4double phi = twopi * G4UniformRand() ;
 
  G4ThreeVector deltaDirection(sint*cos(phi),sint*sin(phi), cost);
  G4ThreeVector direction = dp->GetMomentumDirection();
  deltaDirection.rotateUz(direction);
 
  // create G4DynamicParticle object for delta ray
  G4DynamicParticle* delta = 
    new G4DynamicParticle(theElectron,deltaDirection,deltaKinEnergy);
 
  vdp->push_back(delta);
 
  // Change kinematics of primary particle
  kineticEnergy       -= deltaKinEnergy;
  G4ThreeVector finalP = direction*totMomentum - deltaDirection*deltaMomentum;
  finalP               = finalP.unit();
 
  fParticleChange->SetProposedKineticEnergy(kineticEnergy);
  fParticleChange->SetProposedMomentumDirection(finalP);
}

SetParticle()

void G4mplIonisationWithDeltaModel::SetParticle

(

const G4ParticleDefinition *

p

)

Definition at line 106 of file G4mplIonisationWithDeltaModel.cc.

{
  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);
}

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), Initialise(), and G4mplIonisation::InitialiseEnergyLossProcess().

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

• G4mplIonisationWithDeltaModel.hh
• G4mplIonisationWithDeltaModel.cc