#include <G4PenelopeGammaConversionModel.hh>

Inheritance diagram for G4PenelopeGammaConversionModel:

Collaboration diagram for G4PenelopeGammaConversionModel:

Public Member Functions
	G4PenelopeGammaConversionModel (const G4ParticleDefinition *p=0, const G4String &processName="PenConversion")

virtual	~G4PenelopeGammaConversionModel ()

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

virtual void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel )

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

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

void	SetVerbosityLevel (G4int lev)

G4int	GetVerbosityLevel ()

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, const G4ParticleDefinition , G4double)

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 , 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 *)

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)

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

const G4Isotope *	GetCurrentIsotope () const

G4bool	IsLocked () const

void	SetLocked (G4bool)

Protected Attributes
G4ParticleChangeForGamma *	fParticleChange

const G4ParticleDefinition *	fParticle

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData

G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

size_t	idxTable

Private Member Functions
G4PenelopeGammaConversionModel &	operator= (const G4PenelopeGammaConversionModel &right)

	G4PenelopeGammaConversionModel (const G4PenelopeGammaConversionModel &)

void	SetParticle (const G4ParticleDefinition *)

void	ReadDataFile (const G4int Z)

void	InitializeScreeningRadii ()

void	InitializeScreeningFunctions (const G4Material *)

std::pair< G4double, G4double >	GetScreeningFunctions (G4double)

Private Attributes
G4double	fIntrinsicLowEnergyLimit

G4double	fIntrinsicHighEnergyLimit

G4double	fSmallEnergy

std::map< G4int, G4PhysicsFreeVector * > *	logAtomicCrossSection

G4double	fAtomicScreeningRadius [99]

std::map< const G4Material , G4double >	fEffectiveCharge

std::map< const G4Material , G4double >	fMaterialInvScreeningRadius

std::map< const G4Material , std::pair< G4double, G4double > >	fScreeningFunction

G4int	verboseLevel

G4bool	isInitialised

G4bool	fLocalTable

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 *)

Static Protected Attributes inherited from G4VEmModel
static const G4double	inveplus = 1.0/CLHEP::eplus

Detailed Description

Definition at line 57 of file G4PenelopeGammaConversionModel.hh.

Constructor & Destructor Documentation

◆ G4PenelopeGammaConversionModel() [1/2]

G4PenelopeGammaConversionModel::G4PenelopeGammaConversionModel	(	const G4ParticleDefinition *	p = `0`,
		const G4String &	processName = `"PenConversion"`
	)

Definition at line 56 of file G4PenelopeGammaConversionModel.cc.

   :G4VEmModel(nam),fParticleChange(0),fParticle(0),
    logAtomicCrossSection(0),
    fEffectiveCharge(0),fMaterialInvScreeningRadius(0),
    fScreeningFunction(0),isInitialised(false),fLocalTable(false)
 
 {
   fIntrinsicLowEnergyLimit = 2.0*electron_mass_c2;
   fIntrinsicHighEnergyLimit = 100.0*GeV;
   fSmallEnergy = 1.1*MeV;
 
   InitializeScreeningRadii();
 
   if (part)
     SetParticle(part);
 
   //  SetLowEnergyLimit(fIntrinsicLowEnergyLimit);
   SetHighEnergyLimit(fIntrinsicHighEnergyLimit);
   //
   verboseLevel= 0;
   // Verbosity scale:
   // 0 = nothing
   // 1 = warning for energy non-conservation
   // 2 = details of energy budget
   // 3 = calculation of cross sections, file openings, sampling of atoms
   // 4 = entering in methods
 }

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◆ ~G4PenelopeGammaConversionModel()

G4PenelopeGammaConversionModel::~G4PenelopeGammaConversionModel ( )

virtual

Definition at line 87 of file G4PenelopeGammaConversionModel.cc.

 {
   //Delete shared tables, they exist only in the master model
   if (IsMaster() || fLocalTable)
     {
       if (logAtomicCrossSection)
     {
       std::map <G4int,G4PhysicsFreeVector*>::iterator i;
       for (i=logAtomicCrossSection->begin();i != logAtomicCrossSection->end();i++)
         if (i->second) delete i->second;
       delete logAtomicCrossSection;
     }
       if (fEffectiveCharge)
     delete fEffectiveCharge;
       if (fMaterialInvScreeningRadius)
     delete fMaterialInvScreeningRadius;
       if (fScreeningFunction)
     delete fScreeningFunction;
     }
 }

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◆ G4PenelopeGammaConversionModel() [2/2]

G4PenelopeGammaConversionModel::G4PenelopeGammaConversionModel ( const G4PenelopeGammaConversionModel & )

private

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	,
		G4double	kinEnergy,
		G4double	Z,
		G4double	A = `0`,
		G4double	cut = `0`,
		G4double	emax = `DBL_MAX`
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 220 of file G4PenelopeGammaConversionModel.cc.

 {
   //
   // Penelope model v2008.
   // Cross section (including triplet production) read from database and managed
   // through the G4CrossSectionHandler utility. Cross section data are from
   // M.J. Berger and J.H. Hubbel (XCOM), Report NBSIR 887-3598
   //
 
   if (energy < fIntrinsicLowEnergyLimit)
     return 0;
 
   G4int iZ = (G4int) Z;
 
   //Either Initialize() was not called, or we are in a slave and InitializeLocal() was
   //not invoked
   if (!logAtomicCrossSection)
     {
       //create a **thread-local** version of the table. Used only for G4EmCalculator and
       //Unit Tests
       fLocalTable = true;
       logAtomicCrossSection = new std::map<G4int,G4PhysicsFreeVector*>;
     }
   //now it should be ok
   if (!logAtomicCrossSection->count(iZ))
      {
        //If we are here, it means that Initialize() was inkoved, but the MaterialTable was
        //not filled up. This can happen in a UnitTest or via G4EmCalculator
        if (verboseLevel > 0)
      {
        //Issue a G4Exception (warning) only in verbose mode
        G4ExceptionDescription ed;
        ed << "Unable to retrieve the cross section table for Z=" << iZ << G4endl;
        ed << "This can happen only in Unit Tests or via G4EmCalculator" << G4endl;
        G4Exception("G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom()",
                "em2018",JustWarning,ed);
      }
        //protect file reading via autolock
        G4AutoLock lock(&PenelopeGammaConversionModelMutex);
        ReadDataFile(iZ);
        lock.unlock();
      }
 
   G4double cs = 0;
   G4double logene = std::log(energy);
 
   G4PhysicsFreeVector* theVec = logAtomicCrossSection->find(iZ)->second;
 
   G4double logXS = theVec->Value(logene);
   cs = G4Exp(logXS);
 
   if (verboseLevel > 2)
     G4cout << "Gamma conversion cross section at " << energy/MeV << " MeV for Z=" << Z <<
       " = " << cs/barn << " barn" << G4endl;
   return cs;
 }

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◆ GetScreeningFunctions()

std::pair< G4double, G4double > G4PenelopeGammaConversionModel::GetScreeningFunctions ( G4double B )

private

Definition at line 728 of file G4PenelopeGammaConversionModel.cc.

 {
   // This is subroutine SCHIFF of Penelope
   //
   // Screening Functions F1(B) and F2(B) in the Bethe-Heitler differential cross
   // section for pair production
   //
   std::pair<G4double,G4double> result(0.,0.);
   G4double BSquared = B*B;
   G4double f1 = 2.0-2.0*std::log(1.0+BSquared);
   G4double f2 = f1 - 6.66666666e-1; // (-2/3)
   if (B < 1.0e-10)
     f1 = f1-twopi*B;
   else
     {
       G4double a0 = 4.0*B*std::atan(1./B);
       f1 = f1 - a0;
       f2 += 2.0*BSquared*(4.0-a0-3.0*std::log((1.0+BSquared)/BSquared));
     }
   G4double g1 = 0.5*(3.0*f1-f2);
   G4double g2 = 0.25*(3.0*f1+f2);
 
   result.first = g1;
   result.second = g2;
 
   return result;
 }

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◆ GetVerbosityLevel()

G4int G4PenelopeGammaConversionModel::GetVerbosityLevel ( )

inline

Definition at line 84 of file G4PenelopeGammaConversionModel.hh.

84 {return verboseLevel;};

G4PenelopeGammaConversionModel::verboseLevel

G4int verboseLevel

Definition: G4PenelopeGammaConversionModel.hh:121

◆ Initialise()

void G4PenelopeGammaConversionModel::Initialise	(	const G4ParticleDefinition *	part,
		const G4DataVector &
	)

virtual

Implements G4VEmModel.

Definition at line 111 of file G4PenelopeGammaConversionModel.cc.

 {
   if (verboseLevel > 3)
     G4cout << "Calling  G4PenelopeGammaConversionModel::Initialise()" << G4endl;
 
   SetParticle(part);
 
   //Only the master model creates/fills/destroys the tables
   if (IsMaster() && part == fParticle)
     {
       // logAtomicCrossSection is created only once, since it is never cleared
       if (!logAtomicCrossSection)
     logAtomicCrossSection =  new std::map<G4int,G4PhysicsFreeVector*>;
 
       //delete old material data...
       if (fEffectiveCharge)
     {
       delete fEffectiveCharge;
       fEffectiveCharge = 0;
     }
       if (fMaterialInvScreeningRadius)
     {
       delete fMaterialInvScreeningRadius;
       fMaterialInvScreeningRadius = 0;
     }
       if (fScreeningFunction)
     {
       delete fScreeningFunction;
       fScreeningFunction = 0;
     }
       //and create new ones
       fEffectiveCharge = new std::map<const G4Material*,G4double>;
       fMaterialInvScreeningRadius = new std::map<const G4Material*,G4double>;
       fScreeningFunction = new std::map<const G4Material*,std::pair<G4double,G4double> >;
 
       G4ProductionCutsTable* theCoupleTable =
     G4ProductionCutsTable::GetProductionCutsTable();
 
       for (size_t i=0;i<theCoupleTable->GetTableSize();i++)
     {
       const G4Material* material =
         theCoupleTable->GetMaterialCutsCouple(i)->GetMaterial();
       const G4ElementVector* theElementVector = material->GetElementVector();
 
       for (size_t j=0;j<material->GetNumberOfElements();j++)
         {
           G4int iZ = (G4int) theElementVector->at(j)->GetZ();
           //read data files only in the master
           if (!logAtomicCrossSection->count(iZ))
         ReadDataFile(iZ);
         }
 
       //check if material data are available
       if (!fEffectiveCharge->count(material))
         InitializeScreeningFunctions(material);
     }
 
 
       if (verboseLevel > 0) {
     G4cout << "Penelope Gamma Conversion model v2008 is initialized " << G4endl
            << "Energy range: "
            << LowEnergyLimit() / MeV << " MeV - "
            << HighEnergyLimit() / GeV << " GeV"
            << G4endl;
       }
 
     }
 
 
   if(isInitialised) return;
   fParticleChange = GetParticleChangeForGamma();
   isInitialised = true;
 }

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◆ InitialiseLocal()

void G4PenelopeGammaConversionModel::InitialiseLocal	(	const G4ParticleDefinition *	part,
		G4VEmModel *	masterModel
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 188 of file G4PenelopeGammaConversionModel.cc.

 {
   if (verboseLevel > 3)
     G4cout << "Calling  G4PenelopeGammaConversionModel::InitialiseLocal()" << G4endl;
 
   //
   //Check that particle matches: one might have multiple master models (e.g.
   //for e+ and e-).
   //
   if (part == fParticle)
     {
       //Get the const table pointers from the master to the workers
       const G4PenelopeGammaConversionModel* theModel =
     static_cast<G4PenelopeGammaConversionModel*> (masterModel);
 
       //Copy pointers to the data tables
       fEffectiveCharge = theModel->fEffectiveCharge;
       fMaterialInvScreeningRadius = theModel->fMaterialInvScreeningRadius;
       fScreeningFunction = theModel->fScreeningFunction;
       logAtomicCrossSection = theModel->logAtomicCrossSection;
 
       //Same verbosity for all workers, as the master
       verboseLevel = theModel->verboseLevel;
     }
 
   return;
 }

◆ InitializeScreeningFunctions()

void G4PenelopeGammaConversionModel::InitializeScreeningFunctions ( const G4Material * material )

private

Definition at line 636 of file G4PenelopeGammaConversionModel.cc.

 {
   /*
   if (!IsMaster())
       //Should not be here!
     G4Exception("G4PenelopeGammaConversionModel::InitializeScreeningFunctions()",
         "em01001",FatalException,"Worker thread in this method");
   */
 
   // This is subroutine GPPa0 of Penelope
   //
   // 1) calculate the effective Z for the purpose
   //
   G4double zeff = 0;
   G4int intZ = 0;
   G4int nElements = material->GetNumberOfElements();
   const G4ElementVector* elementVector = material->GetElementVector();
 
   //avoid calculations if only one building element!
   if (nElements == 1)
     {
       zeff = (*elementVector)[0]->GetZ();
       intZ = (G4int) zeff;
     }
   else // many elements...let's do the calculation
     {
       const G4double* fractionVector = material->GetVecNbOfAtomsPerVolume();
 
       G4double atot = 0;
       for (G4int i=0;i<nElements;i++)
     {
       G4double Zelement = (*elementVector)[i]->GetZ();
       G4double Aelement = (*elementVector)[i]->GetAtomicMassAmu();
       atot += Aelement*fractionVector[i];
       zeff += Zelement*Aelement*fractionVector[i]; //average with the number of nuclei
     }
       atot /= material->GetTotNbOfAtomsPerVolume();
       zeff /= (material->GetTotNbOfAtomsPerVolume()*atot);
 
       intZ = (G4int) (zeff+0.25);
       if (intZ <= 0)
     intZ = 1;
       if (intZ > 99)
     intZ = 99;
     }
 
   if (fEffectiveCharge)
     fEffectiveCharge->insert(std::make_pair(material,zeff));
 
   //
   // 2) Calculate Coulomb Correction
   //
   G4double alz = fine_structure_const*zeff;
   G4double alzSquared = alz*alz;
   G4double fc =  alzSquared*(0.202059-alzSquared*
                  (0.03693-alzSquared*
                   (0.00835-alzSquared*(0.00201-alzSquared*
                            (0.00049-alzSquared*
                             (0.00012-alzSquared*0.00003)))))
                  +1.0/(alzSquared+1.0));
   //
   // 3) Screening functions and low-energy corrections
   //
   G4double matRadius = 2.0/ fAtomicScreeningRadius[intZ-1];
   if (fMaterialInvScreeningRadius)
     fMaterialInvScreeningRadius->insert(std::make_pair(material,matRadius));
 
   std::pair<G4double,G4double> myPair(0,0);
   G4double f0a = 4.0*std::log(fAtomicScreeningRadius[intZ-1]);
   G4double f0b = f0a - 4.0*fc;
   myPair.first = f0a;
   myPair.second = f0b;
 
   if (fScreeningFunction)
     fScreeningFunction->insert(std::make_pair(material,myPair));
 
   if (verboseLevel > 2)
     {
       G4cout << "Average Z for material " << material->GetName() << " = " <<
     zeff << G4endl;
       G4cout << "Effective radius for material " << material->GetName() << " = " <<
     fAtomicScreeningRadius[intZ-1] << " m_e*c/hbar --> BCB = " <<
     matRadius << G4endl;
       G4cout << "Screening parameters F0 for material " << material->GetName() << " = " <<
     f0a << "," << f0b << G4endl;
     }
   return;
 }

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◆ InitializeScreeningRadii()

void G4PenelopeGammaConversionModel::InitializeScreeningRadii ( )

private

Definition at line 609 of file G4PenelopeGammaConversionModel.cc.

 {
   G4double temp[99] = {1.2281e+02,7.3167e+01,6.9228e+01,6.7301e+01,6.4696e+01,
                6.1228e+01,5.7524e+01,5.4033e+01,5.0787e+01,4.7851e+01,4.6373e+01,
                4.5401e+01,4.4503e+01,4.3815e+01,4.3074e+01,4.2321e+01,4.1586e+01,
                4.0953e+01,4.0524e+01,4.0256e+01,3.9756e+01,3.9144e+01,3.8462e+01,
                3.7778e+01,3.7174e+01,3.6663e+01,3.5986e+01,3.5317e+01,3.4688e+01,
                3.4197e+01,3.3786e+01,3.3422e+01,3.3068e+01,3.2740e+01,3.2438e+01,
                3.2143e+01,3.1884e+01,3.1622e+01,3.1438e+01,3.1142e+01,3.0950e+01,
                3.0758e+01,3.0561e+01,3.0285e+01,3.0097e+01,2.9832e+01,2.9581e+01,
                2.9411e+01,2.9247e+01,2.9085e+01,2.8930e+01,2.8721e+01,2.8580e+01,
                2.8442e+01,2.8312e+01,2.8139e+01,2.7973e+01,2.7819e+01,2.7675e+01,
                2.7496e+01,2.7285e+01,2.7093e+01,2.6911e+01,2.6705e+01,2.6516e+01,
                2.6304e+01,2.6108e+01,2.5929e+01,2.5730e+01,2.5577e+01,2.5403e+01,
                2.5245e+01,2.5100e+01,2.4941e+01,2.4790e+01,2.4655e+01,2.4506e+01,
                2.4391e+01,2.4262e+01,2.4145e+01,2.4039e+01,2.3922e+01,2.3813e+01,
                2.3712e+01,2.3621e+01,2.3523e+01,2.3430e+01,2.3331e+01,2.3238e+01,
                2.3139e+01,2.3048e+01,2.2967e+01,2.2833e+01,2.2694e+01,2.2624e+01,
                2.2545e+01,2.2446e+01,2.2358e+01,2.2264e+01};
 
   //copy temporary vector in class data member
   for (G4int i=0;i<99;i++)
     fAtomicScreeningRadius[i] = temp[i];
 }

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◆ operator=()

G4PenelopeGammaConversionModel& G4PenelopeGammaConversionModel::operator= ( const G4PenelopeGammaConversionModel & right )

private

◆ ReadDataFile()

void G4PenelopeGammaConversionModel::ReadDataFile ( const G4int Z )

private

Definition at line 511 of file G4PenelopeGammaConversionModel.cc.

 {
   if (!IsMaster())
       //Should not be here!
     G4Exception("G4PenelopeGammaConversionModel::ReadDataFile()",
         "em0100",FatalException,"Worker thread in this method");
 
  if (verboseLevel > 2)
     {
       G4cout << "G4PenelopeGammaConversionModel::ReadDataFile()" << G4endl;
       G4cout << "Going to read Gamma Conversion data files for Z=" << Z << G4endl;
     }
 
   char* path = getenv("G4LEDATA");
   if (!path)
     {
       G4String excep =
     "G4PenelopeGammaConversionModel - G4LEDATA environment variable not set!";
       G4Exception("G4PenelopeGammaConversionModel::ReadDataFile()",
           "em0006",FatalException,excep);
       return;
     }
 
   /*
     Read the cross section file
   */
   std::ostringstream ost;
   if (Z>9)
     ost << path << "/penelope/pairproduction/pdgpp" << Z << ".p08";
   else
     ost << path << "/penelope/pairproduction/pdgpp0" << Z << ".p08";
   std::ifstream file(ost.str().c_str());
   if (!file.is_open())
     {
       G4String excep = "G4PenelopeGammaConversionModel - data file " +
     G4String(ost.str()) + " not found!";
       G4Exception("G4PenelopeGammaConversionModel::ReadDataFile()",
           "em0003",FatalException,excep);
     }
 
   //I have to know in advance how many points are in the data list
   //to initialize the G4PhysicsFreeVector()
   size_t ndata=0;
   G4String line;
   while( getline(file, line) )
     ndata++;
   ndata -= 1; //remove one header line
   //G4cout << "Found: " << ndata << " lines" << G4endl;
 
   file.clear();
   file.close();
   file.open(ost.str().c_str());
   G4int readZ =0;
   file >> readZ;
 
   if (verboseLevel > 3)
     G4cout << "Element Z=" << Z << G4endl;
 
   //check the right file is opened.
   if (readZ != Z)
     {
       G4ExceptionDescription ed;
       ed << "Corrupted data file for Z=" << Z << G4endl;
       G4Exception("G4PenelopeGammaConversionModel::ReadDataFile()",
           "em0005",FatalException,ed);
     }
 
   G4PhysicsFreeVector* theVec = new G4PhysicsFreeVector(ndata);
   G4double ene=0,xs=0;
   for (size_t i=0;i<ndata;i++)
     {
       file >> ene >> xs;
       //dimensional quantities
       ene *= eV;
       xs *= barn;
       if (xs < 1e-40*cm2) //protection against log(0)
     xs = 1e-40*cm2;
       theVec->PutValue(i,std::log(ene),std::log(xs));
     }
   file.close();
 
   if (!logAtomicCrossSection)
     {
       G4ExceptionDescription ed;
       ed << "Problem with allocation of logAtomicCrossSection data table " << G4endl;
       G4Exception("G4PenelopeGammaConversionModel::ReadDataFile()",
           "em2020",FatalException,ed);
       delete theVec;
       return;
     }
   logAtomicCrossSection->insert(std::make_pair(Z,theVec));
 
   return;
 
 }

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◆ SampleSecondaries()

void G4PenelopeGammaConversionModel::SampleSecondaries	(	std::vector< G4DynamicParticle >	fvect,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	aDynamicGamma,
		G4double	tmin,
		G4double	maxEnergy
	)

virtual

Implements G4VEmModel.

Definition at line 284 of file G4PenelopeGammaConversionModel.cc.

 {
   //
   // Penelope model v2008.
   // Final state is sampled according to the Bethe-Heitler model with Coulomb
   // corrections, according to the semi-empirical model of
   //  J. Baro' et al., Radiat. Phys. Chem. 44 (1994) 531.
   //
   // The model uses the high energy Coulomb correction from
   //  H. Davies et al., Phys. Rev. 93 (1954) 788
   // and atomic screening radii tabulated from
   //  J.H. Hubbel et al., J. Phys. Chem. Ref. Data 9 (1980) 1023
   // for Z= 1 to 92.
   //
   if (verboseLevel > 3)
     G4cout << "Calling SamplingSecondaries() of G4PenelopeGammaConversionModel" << G4endl;
 
   G4double photonEnergy = aDynamicGamma->GetKineticEnergy();
 
   // Always kill primary
   fParticleChange->ProposeTrackStatus(fStopAndKill);
   fParticleChange->SetProposedKineticEnergy(0.);
 
   if (photonEnergy <= fIntrinsicLowEnergyLimit)
     {
       fParticleChange->ProposeLocalEnergyDeposit(photonEnergy);
       return ;
     }
 
   G4ParticleMomentum photonDirection = aDynamicGamma->GetMomentumDirection();
   const G4Material* mat = couple->GetMaterial();
 
   //Either Initialize() was not called, or we are in a slave and InitializeLocal() was
   //not invoked
   if (!fEffectiveCharge)
     {
       //create a **thread-local** version of the table. Used only for G4EmCalculator and
       //Unit Tests
       fLocalTable = true;
       fEffectiveCharge = new std::map<const G4Material*,G4double>;
       fMaterialInvScreeningRadius = new std::map<const G4Material*,G4double>;
       fScreeningFunction = new std::map<const G4Material*,std::pair<G4double,G4double> >;
     }
 
   if (!fEffectiveCharge->count(mat))
     {
       //If we are here, it means that Initialize() was inkoved, but the MaterialTable was
       //not filled up. This can happen in a UnitTest or via G4EmCalculator
       if (verboseLevel > 0)
     {
       //Issue a G4Exception (warning) only in verbose mode
       G4ExceptionDescription ed;
       ed << "Unable to allocate the EffectiveCharge data for " <<
         mat->GetName() << G4endl;
       ed << "This can happen only in Unit Tests" << G4endl;
       G4Exception("G4PenelopeGammaConversionModel::SampleSecondaries()",
               "em2019",JustWarning,ed);
     }
       //protect file reading via autolock
       G4AutoLock lock(&PenelopeGammaConversionModelMutex);
       InitializeScreeningFunctions(mat);
       lock.unlock();
     }
 
   // eps is the fraction of the photon energy assigned to e- (including rest mass)
   G4double eps = 0;
   G4double eki = electron_mass_c2/photonEnergy;
 
   //Do it fast for photon energy < 1.1 MeV (close to threshold)
   if (photonEnergy < fSmallEnergy)
     eps = eki + (1.0-2.0*eki)*G4UniformRand();
   else
     {
       //Complete calculation
       G4double effC = fEffectiveCharge->find(mat)->second;
       G4double alz = effC*fine_structure_const;
       G4double T = std::sqrt(2.0*eki);
       G4double F00=(-1.774-1.210e1*alz+1.118e1*alz*alz)*T
          +(8.523+7.326e1*alz-4.441e1*alz*alz)*T*T
          -(1.352e1+1.211e2*alz-9.641e1*alz*alz)*T*T*T
     +(8.946+6.205e1*alz-6.341e1*alz*alz)*T*T*T*T;
 
       G4double F0b = fScreeningFunction->find(mat)->second.second;
       G4double g0 = F0b + F00;
       G4double invRad = fMaterialInvScreeningRadius->find(mat)->second;
       G4double bmin = 4.0*eki/invRad;
       std::pair<G4double,G4double> scree =  GetScreeningFunctions(bmin);
       G4double g1 = scree.first;
       G4double g2 = scree.second;
       G4double g1min = g1+g0;
       G4double g2min = g2+g0;
       G4double xr = 0.5-eki;
       G4double a1 = 2.*g1min*xr*xr/3.;
       G4double p1 = a1/(a1+g2min);
 
       G4bool loopAgain = false;
       //Random sampling of eps
       do{
     loopAgain = false;
     if (G4UniformRand() <= p1)
       {
         G4double  ru2m1 = 2.0*G4UniformRand()-1.0;
         if (ru2m1 < 0)
           eps = 0.5-xr*std::pow(std::abs(ru2m1),1./3.);
         else
           eps = 0.5+xr*std::pow(ru2m1,1./3.);
         G4double B = eki/(invRad*eps*(1.0-eps));
         scree =  GetScreeningFunctions(B);
         g1 = scree.first;
         g1 = std::max(g1+g0,0.);
         if (G4UniformRand()*g1min > g1)
           loopAgain = true;
       }
     else
       {
         eps = eki+2.0*xr*G4UniformRand();
         G4double B = eki/(invRad*eps*(1.0-eps));
         scree =  GetScreeningFunctions(B);
         g2 = scree.second;
         g2 = std::max(g2+g0,0.);
         if (G4UniformRand()*g2min > g2)
           loopAgain = true;
       }
       }while(loopAgain);
 
     }
   if (verboseLevel > 4)
     G4cout << "Sampled eps = " << eps << G4endl;
 
   G4double electronTotEnergy = eps*photonEnergy;
   G4double positronTotEnergy = (1.0-eps)*photonEnergy;
 
   // Scattered electron (positron) angles. ( Z - axis along the parent photon)
 
   //electron kinematics
   G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ;
   G4double costheta_el = G4UniformRand()*2.0-1.0;
   G4double kk = std::sqrt(electronKineEnergy*(electronKineEnergy+2.*electron_mass_c2));
   costheta_el = (costheta_el*electronTotEnergy+kk)/(electronTotEnergy+costheta_el*kk);
   G4double phi_el  = twopi * G4UniformRand() ;
   G4double dirX_el = std::sqrt(1.-costheta_el*costheta_el) * std::cos(phi_el);
   G4double dirY_el = std::sqrt(1.-costheta_el*costheta_el) * std::sin(phi_el);
   G4double dirZ_el = costheta_el;
 
   //positron kinematics
   G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ;
   G4double costheta_po = G4UniformRand()*2.0-1.0;
   kk = std::sqrt(positronKineEnergy*(positronKineEnergy+2.*electron_mass_c2));
   costheta_po = (costheta_po*positronTotEnergy+kk)/(positronTotEnergy+costheta_po*kk);
   G4double phi_po  = twopi * G4UniformRand() ;
   G4double dirX_po = std::sqrt(1.-costheta_po*costheta_po) * std::cos(phi_po);
   G4double dirY_po = std::sqrt(1.-costheta_po*costheta_po) * std::sin(phi_po);
   G4double dirZ_po = costheta_po;
 
   // 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 localEnergyDeposit = 0. ;
 
   if (electronKineEnergy > 0.0)
     {
       G4ThreeVector electronDirection ( dirX_el, dirY_el, dirZ_el);
       electronDirection.rotateUz(photonDirection);
       G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(),
                                electronDirection,
                                electronKineEnergy);
       fvect->push_back(electron);
     }
   else
     {
       localEnergyDeposit += electronKineEnergy;
       electronKineEnergy = 0;
     }
 
   //Generate the positron. Real particle in any case, because it will annihilate. If below
   //threshold, produce it at rest
   if (positronKineEnergy < 0.0)
     {
       localEnergyDeposit += positronKineEnergy;
       positronKineEnergy = 0; //produce it at rest
     }
   G4ThreeVector positronDirection(dirX_po,dirY_po,dirZ_po);
   positronDirection.rotateUz(photonDirection);
   G4DynamicParticle* positron = new G4DynamicParticle(G4Positron::Positron(),
                               positronDirection, positronKineEnergy);
   fvect->push_back(positron);
 
   //Add rest of energy to the local energy deposit
   fParticleChange->ProposeLocalEnergyDeposit(localEnergyDeposit);
 
   if (verboseLevel > 1)
     {
       G4cout << "-----------------------------------------------------------" << G4endl;
       G4cout << "Energy balance from G4PenelopeGammaConversion" << G4endl;
       G4cout << "Incoming photon energy: " << photonEnergy/keV << " keV" << G4endl;
       G4cout << "-----------------------------------------------------------" << G4endl;
       if (electronKineEnergy)
     G4cout << "Electron (explicitely produced) " << electronKineEnergy/keV << " keV"
            << G4endl;
       if (positronKineEnergy)
     G4cout << "Positron (not at rest) " << positronKineEnergy/keV << " keV" << G4endl;
       G4cout << "Rest masses of e+/- " << 2.0*electron_mass_c2/keV << " keV" << G4endl;
       if (localEnergyDeposit)
     G4cout << "Local energy deposit " << localEnergyDeposit/keV << " keV" << G4endl;
       G4cout << "Total final state: " << (electronKineEnergy+positronKineEnergy+
                       localEnergyDeposit+2.0*electron_mass_c2)/keV <<
         " keV" << G4endl;
       G4cout << "-----------------------------------------------------------" << G4endl;
     }
  if (verboseLevel > 0)
     {
       G4double energyDiff = std::fabs(electronKineEnergy+positronKineEnergy+
                       localEnergyDeposit+2.0*electron_mass_c2-photonEnergy);
       if (energyDiff > 0.05*keV)
     G4cout << "Warning from G4PenelopeGammaConversion: problem with energy conservation: "
            << (electronKineEnergy+positronKineEnergy+
            localEnergyDeposit+2.0*electron_mass_c2)/keV
            << " keV (final) vs. " << photonEnergy/keV << " keV (initial)" << G4endl;
     }
 }

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◆ SetParticle()

void G4PenelopeGammaConversionModel::SetParticle ( const G4ParticleDefinition * p )

private

Definition at line 758 of file G4PenelopeGammaConversionModel.cc.

 {
   if(!fParticle) {
     fParticle = p;
   }
 }

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◆ SetVerbosityLevel()

void G4PenelopeGammaConversionModel::SetVerbosityLevel ( G4int lev )

inline

Definition at line 83 of file G4PenelopeGammaConversionModel.hh.

83 {verboseLevel = lev;};

G4PenelopeGammaConversionModel::verboseLevel

G4int verboseLevel

Definition: G4PenelopeGammaConversionModel.hh:121

Member Data Documentation

◆ fAtomicScreeningRadius

G4double G4PenelopeGammaConversionModel::fAtomicScreeningRadius[99]

private

Definition at line 108 of file G4PenelopeGammaConversionModel.hh.

◆ fEffectiveCharge

std::map<const G4Material*,G4double>* G4PenelopeGammaConversionModel::fEffectiveCharge

private

Definition at line 113 of file G4PenelopeGammaConversionModel.hh.

◆ fIntrinsicHighEnergyLimit

G4double G4PenelopeGammaConversionModel::fIntrinsicHighEnergyLimit

private

Definition at line 99 of file G4PenelopeGammaConversionModel.hh.

◆ fIntrinsicLowEnergyLimit

G4double G4PenelopeGammaConversionModel::fIntrinsicLowEnergyLimit

private

Definition at line 98 of file G4PenelopeGammaConversionModel.hh.

◆ fLocalTable

G4bool G4PenelopeGammaConversionModel::fLocalTable

private

Definition at line 125 of file G4PenelopeGammaConversionModel.hh.

◆ fMaterialInvScreeningRadius

std::map<const G4Material*,G4double>* G4PenelopeGammaConversionModel::fMaterialInvScreeningRadius

private

Definition at line 115 of file G4PenelopeGammaConversionModel.hh.

◆ fParticle

const G4ParticleDefinition* G4PenelopeGammaConversionModel::fParticle

protected

Definition at line 88 of file G4PenelopeGammaConversionModel.hh.

◆ fParticleChange

G4ParticleChangeForGamma* G4PenelopeGammaConversionModel::fParticleChange

protected

Definition at line 84 of file G4PenelopeGammaConversionModel.hh.

◆ fScreeningFunction

std::map<const G4Material*,std::pair<G4double,G4double> >* G4PenelopeGammaConversionModel::fScreeningFunction

private

Definition at line 117 of file G4PenelopeGammaConversionModel.hh.

◆ fSmallEnergy

G4double G4PenelopeGammaConversionModel::fSmallEnergy

private

Definition at line 102 of file G4PenelopeGammaConversionModel.hh.

◆ isInitialised

G4bool G4PenelopeGammaConversionModel::isInitialised

private

Definition at line 122 of file G4PenelopeGammaConversionModel.hh.

◆ logAtomicCrossSection

std::map<G4int,G4PhysicsFreeVector*>* G4PenelopeGammaConversionModel::logAtomicCrossSection

private

Definition at line 104 of file G4PenelopeGammaConversionModel.hh.

◆ verboseLevel

G4int G4PenelopeGammaConversionModel::verboseLevel

private

Definition at line 121 of file G4PenelopeGammaConversionModel.hh.

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

Public Member Functions

Protected Attributes

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4PenelopeGammaConversionModel() [1/2]

◆ ~G4PenelopeGammaConversionModel()

◆ G4PenelopeGammaConversionModel() [2/2]

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

◆ GetScreeningFunctions()

◆ GetVerbosityLevel()

◆ Initialise()

◆ InitialiseLocal()

◆ InitializeScreeningFunctions()

◆ InitializeScreeningRadii()

◆ operator=()

◆ ReadDataFile()

◆ SampleSecondaries()

◆ SetParticle()

◆ SetVerbosityLevel()

Member Data Documentation

◆ fAtomicScreeningRadius

◆ fEffectiveCharge

◆ fIntrinsicHighEnergyLimit

◆ fIntrinsicLowEnergyLimit

◆ fLocalTable

◆ fMaterialInvScreeningRadius

◆ fParticle

◆ fParticleChange

◆ fScreeningFunction

◆ fSmallEnergy

◆ isInitialised

◆ logAtomicCrossSection

◆ verboseLevel