#include <G4PenelopeRayleighModel.hh>

Inheritance diagram for G4PenelopeRayleighModel:

Public Member Functions
	G4PenelopeRayleighModel (const G4ParticleDefinition *p=0, const G4String &processName="PenRayleigh")

virtual	~G4PenelopeRayleighModel ()

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

virtual void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel)

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 ()

void	DumpFormFactorTable (const G4Material *)

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 , 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 * > *)

virtual 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)

G4int	SelectRandomAtomNumber (const G4Material *)

G4int	SelectIsotopeNumber (const G4Element *)

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 *)

const G4Element *	GetCurrentElement () const

const G4Isotope *	GetCurrentIsotope () const

G4bool	IsLocked () const

void	SetLocked (G4bool)

G4VEmModel &	operator= (const G4VEmModel &right)=delete

	G4VEmModel (const G4VEmModel &)=delete

Protected Attributes
G4ParticleChangeForGamma *	fParticleChange

const G4ParticleDefinition *	fParticle

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData

G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const G4Material *	pBaseMaterial

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

size_t	idxTable

G4bool	lossFlucFlag

G4double	inveplus

G4double	pFactor

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 *)

Detailed Description

Definition at line 57 of file G4PenelopeRayleighModel.hh.

Constructor & Destructor Documentation

◆ G4PenelopeRayleighModel()

G4PenelopeRayleighModel::G4PenelopeRayleighModel	(	const G4ParticleDefinition *	p = `0`,
		const G4String &	processName = `"PenRayleigh"`
	)

Definition at line 53 of file G4PenelopeRayleighModel.cc.

  :G4VEmModel(nam),fParticleChange(0),fParticle(0),isInitialised(false),
   logAtomicCrossSection(0),atomicFormFactor(0),logFormFactorTable(0),
   pMaxTable(0),samplingTable(0),fLocalTable(false)
{
  fIntrinsicLowEnergyLimit = 100.0*eV;
  fIntrinsicHighEnergyLimit = 100.0*GeV;
  //  SetLowEnergyLimit(fIntrinsicLowEnergyLimit);
  SetHighEnergyLimit(fIntrinsicHighEnergyLimit);
 
  if (part)
    SetParticle(part);
 
  //
  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
 
  //build the energy grid. It is the same for all materials
  G4double logenergy = G4Log(fIntrinsicLowEnergyLimit/2.);
  G4double logmaxenergy = G4Log(1.5*fIntrinsicHighEnergyLimit);
  //finer grid below 160 keV
  G4double logtransitionenergy = G4Log(160*keV);
  G4double logfactor1 = G4Log(10.)/250.;
  G4double logfactor2 = logfactor1*10;
  logEnergyGridPMax.push_back(logenergy);
  do{
    if (logenergy < logtransitionenergy)
      logenergy += logfactor1;
    else
      logenergy += logfactor2;
    logEnergyGridPMax.push_back(logenergy);
  }while (logenergy < logmaxenergy);
}

◆ ~G4PenelopeRayleighModel()

G4PenelopeRayleighModel::~G4PenelopeRayleighModel ( )

virtual

Definition at line 95 of file G4PenelopeRayleighModel.cc.

{
  if (IsMaster() || fLocalTable)
    {
      if (logAtomicCrossSection)
    {
      for (auto& item : (*logAtomicCrossSection))
        if (item.second) delete item.second;
      delete logAtomicCrossSection;
      logAtomicCrossSection = nullptr;
    }
      if (atomicFormFactor)
    {
      for (auto& item : (*atomicFormFactor))
        if (item.second) delete item.second;
      delete atomicFormFactor;
      atomicFormFactor = nullptr;
    }
      ClearTables();
    }
}

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4PenelopeRayleighModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	,
		G4double	kinEnergy,
		G4double	Z,
		G4double	A = `0`,
		G4double	cut = `0`,
		G4double	emax = `DBL_MAX`
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 273 of file G4PenelopeRayleighModel.cc.

{
  // Cross section of Rayleigh scattering in Penelope v2008 is calculated by the EPDL97
  // tabulation, Cuellen et al. (1997), with non-relativistic form factors from Hubbel
  // et al. J. Phys. Chem. Ref. Data 4 (1975) 471; Erratum ibid. 6 (1977) 615.
 
   if (verboseLevel > 3)
    G4cout << "Calling CrossSectionPerAtom() of G4PenelopeRayleighModel" << G4endl;
 
   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("G4PenelopeRayleighModel::ComputeCrossSectionPerAtom()",
              "em2040",JustWarning,ed);
    }
       //protect file reading via autolock
       G4AutoLock lock(&PenelopeRayleighModelMutex);
       ReadDataFile(iZ);
       lock.unlock();
     }
 
   G4double cross = 0;
 
   G4PhysicsFreeVector* atom = logAtomicCrossSection->find(iZ)->second;
   if (!atom)
     {
       G4ExceptionDescription ed;
       ed << "Unable to find Z=" << iZ << " in the atomic cross section table" << G4endl;
       G4Exception("G4PenelopeRayleighModel::ComputeCrossSectionPerAtom()",
           "em2041",FatalException,ed);
       return 0;
     }
   G4double logene = G4Log(energy);
   G4double logXS = atom->Value(logene);
   cross = G4Exp(logXS);
 
   if (verboseLevel > 2)
     {
       G4cout << "Rayleigh cross section at " << energy/keV << " keV for Z=" << Z <<
     " = " << cross/barn << " barn" << G4endl;
     }
 
   return cross;
}

◆ DumpFormFactorTable()

void G4PenelopeRayleighModel::DumpFormFactorTable ( const G4Material * mat )

Definition at line 1332 of file G4PenelopeRayleighModel.cc.

{
  G4cout << "*****************************************************************" << G4endl;
  G4cout << "G4PenelopeRayleighModel: Form Factor Table for " << mat->GetName() << G4endl;
  //try to use the same format as Penelope-Fortran, namely Q (/m_e*c) and F
  G4cout <<  "Q/(m_e*c)                 F(Q)     " << G4endl;
  G4cout << "*****************************************************************" << G4endl;
  if (!logFormFactorTable->count(mat))
    BuildFormFactorTable(mat);
 
  G4PhysicsFreeVector* theVec = logFormFactorTable->find(mat)->second;
  for (size_t i=0;i<theVec->GetVectorLength();i++)
    {
      G4double logQ2 = theVec->GetLowEdgeEnergy(i);
      G4double Q = G4Exp(0.5*logQ2);
      G4double logF2 = (*theVec)[i];
      G4double F = G4Exp(0.5*logF2);
      G4cout << Q << "              " << F << G4endl;
    }
  //DONE
  return;
}

◆ GetVerbosityLevel()

G4int G4PenelopeRayleighModel::GetVerbosityLevel ( )

inline

Definition at line 84 of file G4PenelopeRayleighModel.hh.

84{return verboseLevel;};

◆ Initialise()

void G4PenelopeRayleighModel::Initialise	(	const G4ParticleDefinition *	part,
		const G4DataVector &
	)

virtual

Implements G4VEmModel.

Definition at line 156 of file G4PenelopeRayleighModel.cc.

{
  if (verboseLevel > 3)
    G4cout << "Calling G4PenelopeRayleighModel::Initialise()" << G4endl;
 
  SetParticle(part);
 
  //Only the master model creates/fills/destroys the tables
  if (IsMaster() && part == fParticle)
    {
      //clear tables depending on materials, not the atomic ones
      ClearTables();
 
      if (verboseLevel > 3)
    G4cout << "Calling G4PenelopeRayleighModel::Initialise() [master]" << G4endl;
 
      //create new tables
      //
      // logAtomicCrossSection and atomicFormFactor are created only once,
      // since they are never cleared
      if (!logAtomicCrossSection)
    logAtomicCrossSection = new std::map<G4int,G4PhysicsFreeVector*>;
      if (!atomicFormFactor)
    atomicFormFactor = new std::map<G4int,G4PhysicsFreeVector*>;
 
      if (!logFormFactorTable)
    logFormFactorTable = new std::map<const G4Material*,G4PhysicsFreeVector*>;
      if (!pMaxTable)
    pMaxTable = new std::map<const G4Material*,G4PhysicsFreeVector*>;
      if (!samplingTable)
    samplingTable = new std::map<const G4Material*,G4PenelopeSamplingData*>;
 
 
      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 = theElementVector->at(j)->GetZasInt();
          //read data files only in the master
          if (!logAtomicCrossSection->count(iZ))
        ReadDataFile(iZ);
        }
 
      //1) If the table has not been built for the material, do it!
      if (!logFormFactorTable->count(material))
        BuildFormFactorTable(material);
 
      //2) retrieve or build the sampling table
      if (!(samplingTable->count(material)))
        InitializeSamplingAlgorithm(material);
 
      //3) retrieve or build the pMax data
      if (!pMaxTable->count(material))
        GetPMaxTable(material);
 
    }
 
      if (verboseLevel > 1) {
    G4cout << "Penelope Rayleigh model v2008 is initialized " << G4endl
           << "Energy range: "
           << LowEnergyLimit() / keV << " keV - "
           << HighEnergyLimit() / GeV << " GeV"
           << G4endl;
      }
    }
 
  if(isInitialised) return;
  fParticleChange = GetParticleChangeForGamma();
  isInitialised = true;
}

◆ InitialiseLocal()

void G4PenelopeRayleighModel::InitialiseLocal	(	const G4ParticleDefinition *	part,
		G4VEmModel *	masterModel
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 237 of file G4PenelopeRayleighModel.cc.

{
  if (verboseLevel > 3)
    G4cout << "Calling  G4PenelopeRayleighModel::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 G4PenelopeRayleighModel* theModel =
    static_cast<G4PenelopeRayleighModel*> (masterModel);
 
      //Copy pointers to the data tables
      logAtomicCrossSection = theModel->logAtomicCrossSection;
      atomicFormFactor = theModel->atomicFormFactor;
      logFormFactorTable = theModel->logFormFactorTable;
      pMaxTable = theModel->pMaxTable;
      samplingTable = theModel->samplingTable;
 
      //copy the G4DataVector with the grid
      logQSquareGrid = theModel->logQSquareGrid;
 
      //Same verbosity for all workers, as the master
      verboseLevel = theModel->verboseLevel;
    }
 
  return;
}

◆ SampleSecondaries()

void G4PenelopeRayleighModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	aDynamicGamma,
		G4double	tmin,
		G4double	maxEnergy
	)

virtual

Implements G4VEmModel.

Definition at line 415 of file G4PenelopeRayleighModel.cc.

{
  // Sampling of the Rayleigh final state (namely, scattering angle of the photon)
  // from the Penelope2008 model. The scattering angle is sampled from the atomic
  // cross section dOmega/d(cosTheta) from Born ("Atomic Phyisics", 1969), disregarding
  // anomalous scattering effects. The Form Factor F(Q) function which appears in the
  // analytical cross section is retrieved via the method GetFSquared(); atomic data
  // are tabulated for F(Q). Form factor for compounds is calculated according to
  // the additivity rule. The sampling from the F(Q) is made via a Rational Inverse
  // Transform with Aliasing (RITA) algorithm; RITA parameters are calculated once
  // for each material and managed by G4PenelopeSamplingData objects.
  // The sampling algorithm (rejection method) has efficiency 67% at low energy, and
  // increases with energy. For E=100 keV the efficiency is 100% and 86% for
  // hydrogen and uranium, respectively.
 
  if (verboseLevel > 3)
    G4cout << "Calling SamplingSecondaries() of G4PenelopeRayleighModel" << G4endl;
 
  G4double photonEnergy0 = aDynamicGamma->GetKineticEnergy();
 
  if (photonEnergy0 <= fIntrinsicLowEnergyLimit)
    {
      fParticleChange->ProposeTrackStatus(fStopAndKill);
      fParticleChange->SetProposedKineticEnergy(0.);
      fParticleChange->ProposeLocalEnergyDeposit(photonEnergy0);
      return ;
    }
 
  G4ParticleMomentum photonDirection0 = aDynamicGamma->GetMomentumDirection();
 
  const G4Material* theMat = couple->GetMaterial();
 
 
  //1) Verify if tables are ready
  //Either Initialize() was not called, or we are in a slave and InitializeLocal() was
  //not invoked
  if (!pMaxTable || !samplingTable || !logAtomicCrossSection || !atomicFormFactor ||
      !logFormFactorTable)
    {
      //create a **thread-local** version of the table. Used only for G4EmCalculator and
      //Unit Tests
      fLocalTable = true;
      if (!logAtomicCrossSection)
    logAtomicCrossSection = new std::map<G4int,G4PhysicsFreeVector*>;
      if (!atomicFormFactor)
    atomicFormFactor = new std::map<G4int,G4PhysicsFreeVector*>;
      if (!logFormFactorTable)
    logFormFactorTable = new std::map<const G4Material*,G4PhysicsFreeVector*>;
      if (!pMaxTable)
    pMaxTable = new std::map<const G4Material*,G4PhysicsFreeVector*>;
      if (!samplingTable)
    samplingTable = new std::map<const G4Material*,G4PenelopeSamplingData*>;
    }
 
  if (!samplingTable->count(theMat))
    {
      //If we are here, it means that Initialize() was inkoved, but the MaterialTable was
      //not filled up. This can happen in a UnitTest
      if (verboseLevel > 0)
    {
      //Issue a G4Exception (warning) only in verbose mode
      G4ExceptionDescription ed;
      ed << "Unable to find the samplingTable data for " <<
        theMat->GetName() << G4endl;
      ed << "This can happen only in Unit Tests" << G4endl;
      G4Exception("G4PenelopeRayleighModel::SampleSecondaries()",
              "em2019",JustWarning,ed);
    }
      const G4ElementVector* theElementVector = theMat->GetElementVector();
      //protect file reading via autolock
      G4AutoLock lock(&PenelopeRayleighModelMutex);
      for (size_t j=0;j<theMat->GetNumberOfElements();j++)
    {
      G4int iZ = theElementVector->at(j)->GetZasInt();
      if (!logAtomicCrossSection->count(iZ))
        {
          lock.lock();
          ReadDataFile(iZ);
          lock.unlock();
        }
    }
      lock.lock();
      //1) If the table has not been built for the material, do it!
      if (!logFormFactorTable->count(theMat))
    BuildFormFactorTable(theMat);
 
      //2) retrieve or build the sampling table
      if (!(samplingTable->count(theMat)))
    InitializeSamplingAlgorithm(theMat);
 
      //3) retrieve or build the pMax data
      if (!pMaxTable->count(theMat))
    GetPMaxTable(theMat);
      lock.unlock();
    }
 
  //Ok, restart the job
 
  G4PenelopeSamplingData* theDataTable = samplingTable->find(theMat)->second;
  G4PhysicsFreeVector* thePMax = pMaxTable->find(theMat)->second;
 
  G4double cosTheta = 1.0;
 
  //OK, ready to go!
  G4double qmax = 2.0*photonEnergy0/electron_mass_c2; //this is non-dimensional now
 
  if (qmax < 1e-10) //very low momentum transfer
    {
      G4bool loopAgain=false;
      do
    {
      loopAgain = false;
      cosTheta = 1.0-2.0*G4UniformRand();
      G4double G = 0.5*(1+cosTheta*cosTheta);
      if (G4UniformRand()>G)
        loopAgain = true;
    }while(loopAgain);
    }
  else //larger momentum transfer
    {
      size_t nData = theDataTable->GetNumberOfStoredPoints();
      G4double LastQ2inTheTable = theDataTable->GetX(nData-1);
      G4double q2max = std::min(qmax*qmax,LastQ2inTheTable);
 
      G4bool loopAgain = false;
      G4double MaxPValue = thePMax->Value(photonEnergy0);
      G4double xx=0;
 
      //Sampling by rejection method. The rejection function is
      //G = 0.5*(1+cos^2(theta))
      //
      do{
    loopAgain = false;
    G4double RandomMax = G4UniformRand()*MaxPValue;
    xx = theDataTable->SampleValue(RandomMax);
    //xx is a random value of q^2 in (0,q2max),sampled according to
    //F(Q^2) via the RITA algorithm
    if (xx > q2max)
      loopAgain = true;
    cosTheta = 1.0-2.0*xx/q2max;
    G4double G = 0.5*(1+cosTheta*cosTheta);
    if (G4UniformRand()>G)
      loopAgain = true;
      }while(loopAgain);
    }
 
  G4double sinTheta = std::sqrt(1-cosTheta*cosTheta);
 
  // Scattered photon angles. ( Z - axis along the parent photon)
  G4double phi = twopi * G4UniformRand() ;
  G4double dirX = sinTheta*std::cos(phi);
  G4double dirY = sinTheta*std::sin(phi);
  G4double dirZ = cosTheta;
 
  // Update G4VParticleChange for the scattered photon
  G4ThreeVector photonDirection1(dirX, dirY, dirZ);
 
  photonDirection1.rotateUz(photonDirection0);
  fParticleChange->ProposeMomentumDirection(photonDirection1) ;
  fParticleChange->SetProposedKineticEnergy(photonEnergy0) ;
 
  return;
}

◆ SetVerbosityLevel()

void G4PenelopeRayleighModel::SetVerbosityLevel ( G4int lev )

inline

Definition at line 83 of file G4PenelopeRayleighModel.hh.

83{verboseLevel = lev;};

Member Data Documentation

◆ fParticle

const G4ParticleDefinition* G4PenelopeRayleighModel::fParticle

protected

Definition at line 91 of file G4PenelopeRayleighModel.hh.

Referenced by Initialise(), and InitialiseLocal().

◆ fParticleChange

G4ParticleChangeForGamma* G4PenelopeRayleighModel::fParticleChange

protected

Definition at line 90 of file G4PenelopeRayleighModel.hh.

Referenced by Initialise(), and SampleSecondaries().

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

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4PenelopeRayleighModel()

◆ ~G4PenelopeRayleighModel()

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

◆ DumpFormFactorTable()

◆ GetVerbosityLevel()

◆ Initialise()

◆ InitialiseLocal()

◆ SampleSecondaries()

◆ SetVerbosityLevel()

Member Data Documentation

◆ fParticle

◆ fParticleChange