#include <G4LivermorePolarizedGammaConversionModel.hh>

Inheritance diagram for G4LivermorePolarizedGammaConversionModel:

Public Member Functions
	G4LivermorePolarizedGammaConversionModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="LivermorePolarizedGammaConversion")

virtual	~G4LivermorePolarizedGammaConversionModel ()

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

void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel) override

void	InitialiseForElement (const G4ParticleDefinition *, G4int Z) override

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0, G4double cut=0, G4double emax=DBL_MAX) override

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

G4double	MinPrimaryEnergy (const G4Material , const G4ParticleDefinition , G4double) override

G4LivermorePolarizedGammaConversionModel &	operator= (const G4LivermorePolarizedGammaConversionModel &right)=delete

	G4LivermorePolarizedGammaConversionModel (const G4LivermorePolarizedGammaConversionModel &)=delete

Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)

virtual	~G4VEmModel ()

virtual void	InitialiseForMaterial (const G4ParticleDefinition , const G4Material )

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 38 of file G4LivermorePolarizedGammaConversionModel.hh.

Constructor & Destructor Documentation

◆ G4LivermorePolarizedGammaConversionModel() [1/2]

G4LivermorePolarizedGammaConversionModel::G4LivermorePolarizedGammaConversionModel	(	const G4ParticleDefinition *	p = nullptr,
		const G4String &	nam = "LivermorePolarizedGammaConversion" )

explicit

Definition at line 51 of file G4LivermorePolarizedGammaConversionModel.cc.

  :G4VEmModel(nam), smallEnergy(2.*MeV), isInitialised(false)
{
  fParticleChange = nullptr;
  lowEnergyLimit = 2*electron_mass_c2;
  
  Phi=0.;
  Psi=0.;
  
  verboseLevel= 0;
  // Verbosity scale:
  // 0 = nothing 
  // 1 = calculation of cross sections, file openings, samping of atoms
  // 2 = entering in methods
  
  if(verboseLevel > 0) {
    G4cout << "Livermore Polarized GammaConversion is constructed " 
       << G4endl;
  }
  
}

◆ ~G4LivermorePolarizedGammaConversionModel()

G4LivermorePolarizedGammaConversionModel::~G4LivermorePolarizedGammaConversionModel ( )

virtual

Definition at line 76 of file G4LivermorePolarizedGammaConversionModel.cc.

{  
  if(IsMaster()) {
    for(G4int i=0; i<maxZ; ++i) {
      if(data[i]) { 
    delete data[i];
    data[i] = nullptr;
      }
    }
  }  
}

◆ G4LivermorePolarizedGammaConversionModel() [2/2]

G4LivermorePolarizedGammaConversionModel::G4LivermorePolarizedGammaConversionModel ( const G4LivermorePolarizedGammaConversionModel & )

delete

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4LivermorePolarizedGammaConversionModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	,
		G4double	kinEnergy,
		G4double	Z,
		G4double	A = 0,
		G4double	cut = 0,
		G4double	emax = DBL_MAX )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 211 of file G4LivermorePolarizedGammaConversionModel.cc.

{
  if (verboseLevel > 1) {
    G4cout << "G4LivermorePolarizedGammaConversionModel::ComputeCrossSectionPerAtom()" 
       << G4endl;
  }
  if (GammaEnergy < lowEnergyLimit) { return 0.0; } 
  
  G4double xs = 0.0;
  
  G4int intZ=G4int(Z);
  
  if(intZ < 1 || intZ > maxZ) { return xs; }
  
  G4PhysicsFreeVector* pv = data[intZ];
  
  // if element was not initialised
  // do initialisation safely for MT mode
  if(!pv) 
    {
      InitialiseForElement(0, intZ);
      pv = data[intZ];
      if(!pv) { return xs; }
    }
  // x-section is taken from the table
  xs = pv->Value(GammaEnergy); 
  
  if(verboseLevel > 0)
    {
      G4int n = G4int(pv->GetVectorLength() - 1);
      G4cout  <<  "****** DEBUG: tcs value for Z=" << Z << " at energy (MeV)=" 
          << GammaEnergy/MeV << G4endl;
      G4cout  <<  "  cs (Geant4 internal unit)=" << xs << G4endl;
      G4cout  <<  "    -> first cs value in EADL data file (iu) =" << (*pv)[0] << G4endl;
      G4cout  <<  "    -> last  cs value in EADL data file (iu) =" << (*pv)[n] << G4endl;
      G4cout  <<  "*********************************************************" << G4endl;
    }
  
  return xs;
}

◆ Initialise()

void G4LivermorePolarizedGammaConversionModel::Initialise	(	const G4ParticleDefinition *	particle,
		const G4DataVector &	cuts )

overridevirtual

Implements G4VEmModel.

Definition at line 90 of file G4LivermorePolarizedGammaConversionModel.cc.

{
  if (verboseLevel > 1)
    {
      G4cout << "Calling1 G4LivermorePolarizedGammaConversionModel::Initialise()" 
         << G4endl
             << "Energy range: "
         << LowEnergyLimit() / MeV << " MeV - "
             << HighEnergyLimit() / GeV << " GeV"
             << G4endl;
    }
  
  if(IsMaster()) 
    {
      // Initialise element selector    
      InitialiseElementSelectors(particle, cuts);
      
      // Access to elements
      const char* path = G4FindDataDir("G4LEDATA");
      
      G4ProductionCutsTable* theCoupleTable =
    G4ProductionCutsTable::GetProductionCutsTable();
      
      G4int numOfCouples = (G4int)theCoupleTable->GetTableSize();
      
      for(G4int i=0; i<numOfCouples; ++i) 
    {
      const G4Material* material = 
        theCoupleTable->GetMaterialCutsCouple(i)->GetMaterial();
      const G4ElementVector* theElementVector = material->GetElementVector();
      std::size_t nelm = material->GetNumberOfElements();
      
      for (std::size_t j=0; j<nelm; ++j) 
        {
          G4int Z = (G4int)(*theElementVector)[j]->GetZ();
          if(Z < 1)          { Z = 1; }
          else if(Z > maxZ)  { Z = maxZ; }
          if(!data[Z]) { ReadData(Z, path); }
        }
    }
    }
  if(isInitialised) { return; }
  fParticleChange = GetParticleChangeForGamma();
  isInitialised = true;
}

◆ InitialiseForElement()

void G4LivermorePolarizedGammaConversionModel::InitialiseForElement	(	const G4ParticleDefinition *	,
		G4int	Z )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 984 of file G4LivermorePolarizedGammaConversionModel.cc.

{
  G4AutoLock l(&LivermorePolarizedGammaConversionModelMutex);
  if(!data[Z]) { ReadData(Z); }
  l.unlock();
}

Referenced by ComputeCrossSectionPerAtom().

◆ InitialiseLocal()

void G4LivermorePolarizedGammaConversionModel::InitialiseLocal	(	const G4ParticleDefinition *	,
		G4VEmModel *	masterModel )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 139 of file G4LivermorePolarizedGammaConversionModel.cc.

{
  SetElementSelectors(masterModel->GetElementSelectors());
}

◆ MinPrimaryEnergy()

G4double G4LivermorePolarizedGammaConversionModel::MinPrimaryEnergy	(	const G4Material *	,
		const G4ParticleDefinition *	,
		G4double	)

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 147 of file G4LivermorePolarizedGammaConversionModel.cc.

{
  return lowEnergyLimit;
}

◆ operator=()

G4LivermorePolarizedGammaConversionModel & G4LivermorePolarizedGammaConversionModel::operator= ( const G4LivermorePolarizedGammaConversionModel & right )

delete

◆ SampleSecondaries()

void G4LivermorePolarizedGammaConversionModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	fvect,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	aDynamicGamma,
		G4double	tmin,
		G4double	maxEnergy )

overridevirtual

Implements G4VEmModel.

Definition at line 259 of file G4LivermorePolarizedGammaConversionModel.cc.

{
 
  // Fluorescence generated according to:
  // J. Stepanek ,"A program to determine the radiation spectra due to a single atomic
  // subshell ionisation by a particle or due to deexcitation or decay of radionuclides",
  // Comp. Phys. Comm. 1206 pp 1-1-9 (1997)
  if (verboseLevel > 3)
    G4cout << "Calling SampleSecondaries() of G4LivermorePolarizedGammaConversionModel" << G4endl;
 
  G4double photonEnergy = aDynamicGamma->GetKineticEnergy();
 
  if(photonEnergy <= lowEnergyLimit)
    {
      fParticleChange->ProposeTrackStatus(fStopAndKill);
      fParticleChange->SetProposedKineticEnergy(0.);
      return;
    }
 
  G4ThreeVector gammaPolarization0 = aDynamicGamma->GetPolarization();
  G4ThreeVector gammaDirection0 = aDynamicGamma->GetMomentumDirection();
 
  // Make sure that the polarization vector is perpendicular to the
  // gamma direction. If not
  if(!(gammaPolarization0.isOrthogonal(gammaDirection0, 1e-6))||(gammaPolarization0.mag()==0))
    { // only for testing now
      gammaPolarization0 = GetRandomPolarization(gammaDirection0);
    }
  else
    {
      if ( gammaPolarization0.howOrthogonal(gammaDirection0) != 0)
    {
      gammaPolarization0 = GetPerpendicularPolarization(gammaDirection0, gammaPolarization0);
    }
    }
 
  // End of Protection
 
  G4double epsilon ;
  G4double epsilon0Local = electron_mass_c2 / photonEnergy ;
 
  // Do it fast if photon energy < 2. MeV
 
  if (photonEnergy < smallEnergy )
    {
      epsilon = epsilon0Local + (0.5 - epsilon0Local) * G4UniformRand();
    }
  else
    {
      // Select randomly one element in the current material 
      const G4ParticleDefinition* particle =  aDynamicGamma->GetDefinition();
      const G4Element* element = SelectRandomAtom(couple,particle,photonEnergy);
      
      if (element == nullptr)
        {
          G4cout << "G4LivermorePolarizedGammaConversionModel::SampleSecondaries - element = 0" << G4endl;
      return;
        }
      
      
      G4IonisParamElm* ionisation = element->GetIonisation();      
      if (ionisation == nullptr)
        {
          G4cout << "G4LivermorePolarizedGammaConversionModel::SampleSecondaries - ionisation = 0" << G4endl;
      return;
        }
      
      // Extract Coulomb factor for this Element
      G4double fZ = 8. * (ionisation->GetlogZ3());
      if (photonEnergy > 50. * MeV) fZ += 8. * (element->GetfCoulomb());
 
      // Limits of the screening variable
      G4double screenFactor = 136. * epsilon0Local / (element->GetIonisation()->GetZ3()) ;
      G4double screenMax = G4Exp ((42.24 - fZ)/8.368) - 0.952 ;
      G4double screenMin = std::min(4.*screenFactor,screenMax) ;
 
      // Limits of the energy sampling
      G4double epsilon1 = 0.5 - 0.5 * sqrt(1. - screenMin / screenMax) ;
      G4double epsilonMin = std::max(epsilon0Local,epsilon1);
      G4double epsilonRange = 0.5 - epsilonMin ;
 
      // Sample the energy rate of the created electron (or positron)
      G4double screen;
      G4double gReject ;
 
      G4double f10 = ScreenFunction1(screenMin) - fZ;
      G4double f20 = ScreenFunction2(screenMin) - fZ;
      G4double normF1 = std::max(f10 * epsilonRange * epsilonRange,0.);
      G4double normF2 = std::max(1.5 * f20,0.);
 
      do {
        if (normF1 / (normF1 + normF2) > G4UniformRand() )
          {
            epsilon = 0.5 - epsilonRange * pow(G4UniformRand(), 0.3333) ;
            screen = screenFactor / (epsilon * (1. - epsilon));
            gReject = (ScreenFunction1(screen) - fZ) / f10 ;
          }
        else
          {
            epsilon = epsilonMin + epsilonRange * G4UniformRand();
            screen = screenFactor / (epsilon * (1 - epsilon));
            gReject = (ScreenFunction2(screen) - fZ) / f20 ;
      }
      } while ( gReject < G4UniformRand() );
    }   //  End of epsilon sampling
  
  // Fix charges randomly
  G4double electronTotEnergy;
  G4double positronTotEnergy;
 
  if (G4UniformRand() > 0.5)  
    {
      electronTotEnergy = (1. - epsilon) * photonEnergy;
      positronTotEnergy = epsilon * photonEnergy;
    }
  else
    {
      positronTotEnergy = (1. - epsilon) * photonEnergy;
      electronTotEnergy = epsilon * photonEnergy;
    }
  
  // Scattered electron (positron) angles. ( Z - axis along the parent photon)
  // Universal distribution suggested by L. Urban (Geant3 manual (1993) Phys211),
  // derived from Tsai distribution (Rev. Mod. Phys. 49, 421 (1977)
  G4double Ene = electronTotEnergy/electron_mass_c2; // Normalized energy
 
  G4double cosTheta = 0.;
  G4double sinTheta = 0.;
 
  SetTheta(&cosTheta,&sinTheta,Ene);
  G4double phi,psi=0.;
 
  //corrected e+ e- angular angular distribution //preliminary!
  phi = SetPhi(photonEnergy);
  psi = SetPsi(photonEnergy,phi);
  Psi = psi;
  Phi = phi;
 
  G4double phie, phip; 
  G4double choice, choice2;
  choice = G4UniformRand();
  choice2 = G4UniformRand();
 
  if (choice2 <= 0.5)
    {
      // do nothing 
      //  phi = phi;
    }
  else
    {
      phi = -phi;
    }
  
  if (choice <= 0.5)
    {
      phie = psi; //azimuthal angle for the electron
      phip = phie+phi; //azimuthal angle for the positron
    }
  else
    {
      // opzione 1 phie / phip equivalenti
      phip = psi; //azimuthal angle for the positron
      phie = phip + phi; //azimuthal angle for the electron
    }
 
 
  // Electron Kinematics 
  G4double dirX = sinTheta*cos(phie);
  G4double dirY = sinTheta*sin(phie);
  G4double dirZ = cosTheta;
  G4ThreeVector electronDirection(dirX,dirY,dirZ);
 
  // Kinematics of the created pair:
  // the electron and positron are assumed to have a symetric angular
  // distribution with respect to the Z axis along the parent photon
 
  G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ;
 
  SystemOfRefChange(gammaDirection0,electronDirection,
            gammaPolarization0);
 
  G4DynamicParticle* particle1 = new G4DynamicParticle (G4Electron::Electron(),
                            electronDirection,
                            electronKineEnergy);
 
  // The e+ is always created (even with kinetic energy = 0) for further annihilation
  Ene = positronTotEnergy/electron_mass_c2; // Normalized energy
 
  cosTheta = 0.;
  sinTheta = 0.;
 
  SetTheta(&cosTheta,&sinTheta,Ene);
 
  // Positron Kinematics
  dirX = sinTheta*cos(phip);
  dirY = sinTheta*sin(phip);
  dirZ = cosTheta;
  G4ThreeVector positronDirection(dirX,dirY,dirZ);
 
  G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ;
  SystemOfRefChange(gammaDirection0,positronDirection,
            gammaPolarization0);
 
  // Create G4DynamicParticle object for the particle2
  G4DynamicParticle* particle2 = new G4DynamicParticle(G4Positron::Positron(),
                                                       positronDirection, positronKineEnergy);
  fvect->push_back(particle1);
  fvect->push_back(particle2);
 
  // Kill the incident photon
  fParticleChange->SetProposedKineticEnergy(0.);
  fParticleChange->ProposeTrackStatus(fStopAndKill);
}

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4LivermorePolarizedGammaConversionModel() [1/2]

◆ ~G4LivermorePolarizedGammaConversionModel()

◆ G4LivermorePolarizedGammaConversionModel() [2/2]

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

◆ Initialise()

◆ InitialiseForElement()

◆ InitialiseLocal()

◆ MinPrimaryEnergy()

◆ operator=()

◆ SampleSecondaries()