G4LowEnergyRayleigh Class Reference

#include <G4LowEnergyRayleigh.hh>

Inheritance diagram for G4LowEnergyRayleigh:

Public Member Functions
	G4LowEnergyRayleigh (const G4String &processName="LowEnRayleigh")
	~G4LowEnergyRayleigh ()
G4bool	IsApplicable (const G4ParticleDefinition &)
void	BuildPhysicsTable (const G4ParticleDefinition &photon)
G4VParticleChange *	PostStepDoIt (const G4Track &aTrack, const G4Step &aStep)
G4double	DumpMeanFreePath (const G4Track &aTrack, G4double previousStepSize, G4ForceCondition *condition)
Public Member Functions inherited from G4VDiscreteProcess
	G4VDiscreteProcess (const G4String &, G4ProcessType aType=fNotDefined)
	G4VDiscreteProcess (G4VDiscreteProcess &)
virtual	~G4VDiscreteProcess ()
virtual G4double	PostStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)
virtual G4double	AlongStepGetPhysicalInteractionLength (const G4Track &, G4double, G4double, G4double &, G4GPILSelection *)
virtual G4double	AtRestGetPhysicalInteractionLength (const G4Track &, G4ForceCondition *)
virtual G4VParticleChange *	AtRestDoIt (const G4Track &, const G4Step &)
virtual G4VParticleChange *	AlongStepDoIt (const G4Track &, const G4Step &)
Public Member Functions inherited from G4VProcess
	G4VProcess (const G4String &aName="NoName", G4ProcessType aType=fNotDefined)
	G4VProcess (const G4VProcess &right)
virtual	~G4VProcess ()
G4int	operator== (const G4VProcess &right) const
G4int	operator!= (const G4VProcess &right) const
G4double	GetCurrentInteractionLength () const
void	SetPILfactor (G4double value)
G4double	GetPILfactor () const
G4double	AlongStepGPIL (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &proposedSafety, G4GPILSelection *selection)
G4double	AtRestGPIL (const G4Track &track, G4ForceCondition *condition)
G4double	PostStepGPIL (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)
virtual void	PreparePhysicsTable (const G4ParticleDefinition &)
virtual G4bool	StorePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
virtual G4bool	RetrievePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
const G4String &	GetPhysicsTableFileName (const G4ParticleDefinition *, const G4String &directory, const G4String &tableName, G4bool ascii=false)
const G4String &	GetProcessName () const
G4ProcessType	GetProcessType () const
void	SetProcessType (G4ProcessType)
G4int	GetProcessSubType () const
void	SetProcessSubType (G4int)
virtual void	StartTracking (G4Track *)
virtual void	EndTracking ()
virtual void	SetProcessManager (const G4ProcessManager *)
virtual const G4ProcessManager *	GetProcessManager ()
virtual void	ResetNumberOfInteractionLengthLeft ()
G4double	GetNumberOfInteractionLengthLeft () const
G4double	GetTotalNumberOfInteractionLengthTraversed () const
G4bool	isAtRestDoItIsEnabled () const
G4bool	isAlongStepDoItIsEnabled () const
G4bool	isPostStepDoItIsEnabled () const
virtual void	DumpInfo () const
void	SetVerboseLevel (G4int value)
G4int	GetVerboseLevel () const
virtual void	SetMasterProcess (G4VProcess *masterP)
const G4VProcess *	GetMasterProcess () const
virtual void	BuildWorkerPhysicsTable (const G4ParticleDefinition &part)
virtual void	PrepareWorkerPhysicsTable (const G4ParticleDefinition &)

Protected Member Functions
G4double	GetMeanFreePath (const G4Track &aTrack, G4double previousStepSize, G4ForceCondition *condition)
Protected Member Functions inherited from G4VProcess
void	SubtractNumberOfInteractionLengthLeft (G4double previousStepSize)
void	ClearNumberOfInteractionLengthLeft ()

Additional Inherited Members
Static Public Member Functions inherited from G4VProcess
static const G4String &	GetProcessTypeName (G4ProcessType)
Protected Attributes inherited from G4VProcess
const G4ProcessManager *	aProcessManager
G4VParticleChange *	pParticleChange
G4ParticleChange	aParticleChange
G4double	theNumberOfInteractionLengthLeft
G4double	currentInteractionLength
G4double	theInitialNumberOfInteractionLength
G4String	theProcessName
G4String	thePhysicsTableFileName
G4ProcessType	theProcessType
G4int	theProcessSubType
G4double	thePILfactor
G4bool	enableAtRestDoIt
G4bool	enableAlongStepDoIt
G4bool	enablePostStepDoIt
G4int	verboseLevel

Detailed Description

Definition at line 60 of file G4LowEnergyRayleigh.hh.

Constructor & Destructor Documentation

G4LowEnergyRayleigh::G4LowEnergyRayleigh

(

const G4String &

processName = "LowEnRayleigh"

)

Definition at line 73 of file G4LowEnergyRayleigh.cc.

References FatalException, G4cout, G4endl, G4Exception(), G4VProcess::GetProcessName(), python.hepunit::GeV, python.hepunit::keV, G4RDVEMDataSet::LoadData(), and G4VProcess::verboseLevel.

  : G4VDiscreteProcess(processName),
    lowEnergyLimit(250*eV),
    highEnergyLimit(100*GeV),
    intrinsicLowEnergyLimit(10*eV),
    intrinsicHighEnergyLimit(100*GeV)
{
  if (lowEnergyLimit < intrinsicLowEnergyLimit ||
      highEnergyLimit > intrinsicHighEnergyLimit)
    {
      G4Exception("G4LowEnergyRayleigh::G4LowEnergyRayleigh()",
                  "OutOfRange", FatalException,
                  "Energy limit outside intrinsic process validity range!");
    }

  crossSectionHandler = new G4RDCrossSectionHandler();

  G4RDVDataSetAlgorithm* ffInterpolation = new G4RDLogLogInterpolation;
  G4String formFactorFile = "rayl/re-ff-";
  formFactorData = new G4RDCompositeEMDataSet(ffInterpolation,1.,1.);
  formFactorData->LoadData(formFactorFile);

  meanFreePathTable = 0;

   if (verboseLevel > 0)
     {
       G4cout << GetProcessName() << " is created " << G4endl
          << "Energy range: "
          << lowEnergyLimit / keV << " keV - "
          << highEnergyLimit / GeV << " GeV"
          << G4endl;
     }
}

G4LowEnergyRayleigh::~G4LowEnergyRayleigh

(

)

Definition at line 107 of file G4LowEnergyRayleigh.cc.

{
  delete meanFreePathTable;
  delete crossSectionHandler;
  delete formFactorData;
}

Member Function Documentation

void G4LowEnergyRayleigh::BuildPhysicsTable ( const G4ParticleDefinition &  photon )

virtual

Reimplemented from G4VProcess.

Definition at line 114 of file G4LowEnergyRayleigh.cc.

References G4RDVCrossSectionHandler::BuildMeanFreePathForMaterials(), G4RDVCrossSectionHandler::Clear(), and G4RDVCrossSectionHandler::LoadData().

{

  crossSectionHandler->Clear();
  G4String crossSectionFile = "rayl/re-cs-";
  crossSectionHandler->LoadData(crossSectionFile);

  delete meanFreePathTable;
  meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials();
}

G4double G4LowEnergyRayleigh::DumpMeanFreePath ( const G4Track &  aTrack, G4double  previousStepSize, G4ForceCondition *  condition  )

inline

Definition at line 75 of file G4LowEnergyRayleigh.hh.

References GetMeanFreePath().

  { return GetMeanFreePath(aTrack, previousStepSize, condition); }

G4double G4LowEnergyRayleigh::GetMeanFreePath ( const G4Track &  aTrack, G4double  previousStepSize, G4ForceCondition *  condition  )

protectedvirtual

Implements G4VDiscreteProcess.

Definition at line 202 of file G4LowEnergyRayleigh.cc.

References DBL_MAX, energy(), G4RDVEMDataSet::FindValue(), G4Track::GetDynamicParticle(), G4MaterialCutsCouple::GetIndex(), G4DynamicParticle::GetKineticEnergy(), G4Track::GetMaterialCutsCouple(), and photon.

Referenced by DumpMeanFreePath().

{
  const G4DynamicParticle* photon = track.GetDynamicParticle();
  G4double energy = photon->GetKineticEnergy();
  const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple();
  size_t materialIndex = couple->GetIndex();

  G4double meanFreePath;
  if (energy > highEnergyLimit) meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex);
  else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX;
  else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex);
  return meanFreePath;
}

G4bool G4LowEnergyRayleigh::IsApplicable ( const G4ParticleDefinition &  particle )

virtual

Reimplemented from G4VProcess.

Definition at line 197 of file G4LowEnergyRayleigh.cc.

References G4Gamma::Gamma().

{
  return ( &particle == G4Gamma::Gamma() ); 
}

G4VParticleChange * G4LowEnergyRayleigh::PostStepDoIt ( const G4Track &  aTrack, const G4Step &  aStep  )

virtual

Reimplemented from G4VDiscreteProcess.

Definition at line 125 of file G4LowEnergyRayleigh.cc.

References G4VProcess::aParticleChange, python.hepunit::c_light, python.hepunit::cm, G4RDVEMDataSet::FindValue(), fStopAndKill, G4UniformRand, G4Track::GetDynamicParticle(), G4DynamicParticle::GetKineticEnergy(), G4Track::GetMaterialCutsCouple(), G4DynamicParticle::GetMomentumDirection(), python.hepunit::h_Planck, G4ParticleChange::Initialize(), G4VDiscreteProcess::PostStepDoIt(), G4ParticleChange::ProposeEnergy(), G4VParticleChange::ProposeLocalEnergyDeposit(), G4ParticleChange::ProposeMomentumDirection(), G4VParticleChange::ProposeTrackStatus(), CLHEP::Hep3Vector::rotateUz(), G4RDVCrossSectionHandler::SelectRandomAtom(), G4VParticleChange::SetNumberOfSecondaries(), python.hepunit::twopi, and test::x.

{

  aParticleChange.Initialize(aTrack);

  const G4DynamicParticle* incidentPhoton = aTrack.GetDynamicParticle();
  G4double photonEnergy0 = incidentPhoton->GetKineticEnergy();

  if (photonEnergy0 <= lowEnergyLimit)
    {
      aParticleChange.ProposeTrackStatus(fStopAndKill);
      aParticleChange.ProposeEnergy(0.);
      aParticleChange.ProposeLocalEnergyDeposit(photonEnergy0);
      return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep);
    }

  //  G4double e0m = photonEnergy0 / electron_mass_c2 ;
  G4ParticleMomentum photonDirection0 = incidentPhoton->GetMomentumDirection();

  // Select randomly one element in the current material
  const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple();
  G4int Z = crossSectionHandler->SelectRandomAtom(couple,photonEnergy0);

  // Sample the angle of the scattered photon

  G4double wlPhoton = h_Planck*c_light/photonEnergy0;

  G4double gReject,x,dataFormFactor;
  G4double randomFormFactor;
  G4double cosTheta;
  G4double sinTheta;
  G4double fcostheta;

  do
    {
      do
      {
      cosTheta = 2. * G4UniformRand() - 1.;
      fcostheta = ( 1. + cosTheta*cosTheta)/2.;
      } while (fcostheta < G4UniformRand());

      G4double sinThetaHalf = std::sqrt((1. - cosTheta) / 2.);
      x = sinThetaHalf / (wlPhoton/cm);
      if (x > 1.e+005)
         dataFormFactor = formFactorData->FindValue(x,Z-1);
      else
         dataFormFactor = formFactorData->FindValue(0.,Z-1);
      randomFormFactor = G4UniformRand() * Z * Z;
      sinTheta = std::sqrt(1. - cosTheta*cosTheta);
      gReject = dataFormFactor * dataFormFactor;

    } while( gReject < randomFormFactor);

  // 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);
  aParticleChange.ProposeEnergy(photonEnergy0);
  aParticleChange.ProposeMomentumDirection(photonDirection1);

  aParticleChange.SetNumberOfSecondaries(0);

  return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}

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

• G4LowEnergyRayleigh.hh
• G4LowEnergyRayleigh.cc