G4OpRayleigh Class Reference

#include <G4OpRayleigh.hh>

Inheritance diagram for G4OpRayleigh:

Public Member Functions
	G4OpRayleigh (const G4String &processName="OpRayleigh", G4ProcessType type=fOptical)
	~G4OpRayleigh ()
G4bool	IsApplicable (const G4ParticleDefinition &aParticleType)
G4double	GetMeanFreePath (const G4Track &aTrack, G4double, G4ForceCondition *)
G4VParticleChange *	PostStepDoIt (const G4Track &aTrack, const G4Step &aStep)
G4PhysicsTable *	GetPhysicsTable () const
void	DumpPhysicsTable () const
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 G4VParticleChange *	PostStepDoIt (const G4Track &, const G4Step &)
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
virtual G4VParticleChange *	PostStepDoIt (const G4Track &track, const G4Step &stepData)=0
virtual G4VParticleChange *	AlongStepDoIt (const G4Track &track, const G4Step &stepData)=0
virtual G4VParticleChange *	AtRestDoIt (const G4Track &track, const G4Step &stepData)=0
virtual G4double	AlongStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &proposedSafety, G4GPILSelection *selection)=0
virtual G4double	AtRestGetPhysicalInteractionLength (const G4Track &track, G4ForceCondition *condition)=0
virtual G4double	PostStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)=0
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 G4bool	IsApplicable (const G4ParticleDefinition &)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
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

Protected Attributes
G4PhysicsTable *	thePhysicsTable
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

Additional Inherited Members
Static Public Member Functions inherited from G4VProcess
static const G4String &	GetProcessTypeName (G4ProcessType)
virtual G4double	GetMeanFreePath (const G4Track &aTrack, G4double previousStepSize, G4ForceCondition *condition)=0
Protected Member Functions inherited from G4VProcess
void	SubtractNumberOfInteractionLengthLeft (G4double previousStepSize)
void	ClearNumberOfInteractionLengthLeft ()

Detailed Description

Definition at line 76 of file G4OpRayleigh.hh.

Constructor & Destructor Documentation

G4OpRayleigh()

G4OpRayleigh::G4OpRayleigh	(	const G4String &	processName = "OpRayleigh",
		G4ProcessType	type = fOptical
	)

Definition at line 82 of file G4OpRayleigh.cc.

           : G4VDiscreteProcess(processName, type)
{
        SetProcessSubType(fOpRayleigh);
 
        thePhysicsTable = 0;
 
        DefaultWater = false;
 
        if (verboseLevel>0) {
           G4cout << GetProcessName() << " is created " << G4endl;
        }
 
        BuildThePhysicsTable();
}

~G4OpRayleigh()

G4OpRayleigh::~G4OpRayleigh

(

)

Definition at line 106 of file G4OpRayleigh.cc.

{
        if (thePhysicsTable!= 0) {
           thePhysicsTable->clearAndDestroy();
           delete thePhysicsTable;
        }
}

Member Function Documentation

DumpPhysicsTable()

void G4OpRayleigh::DumpPhysicsTable ( ) const

inline

Definition at line 163 of file G4OpRayleigh.hh.

{
        G4int PhysicsTableSize = thePhysicsTable->entries();
        G4PhysicsOrderedFreeVector *v;
 
        for (G4int i = 0 ; i < PhysicsTableSize ; i++ )
        {
                v = (G4PhysicsOrderedFreeVector*)(*thePhysicsTable)[i];
                v->DumpValues();
        }
}

GetMeanFreePath()

G4double G4OpRayleigh::GetMeanFreePath ( const G4Track &  aTrack, G4double  , G4ForceCondition *    )

virtual

Implements G4VDiscreteProcess.

Definition at line 262 of file G4OpRayleigh.cc.

{
        const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
        const G4Material* aMaterial = aTrack.GetMaterial();
 
        G4double thePhotonEnergy = aParticle->GetTotalEnergy();
 
        G4double AttenuationLength = DBL_MAX;
 
        if (aMaterial->GetName() == "Water" && DefaultWater){
 
           G4bool isOutRange;
 
           AttenuationLength =
                (*thePhysicsTable)(aMaterial->GetIndex())->
                           GetValue(thePhotonEnergy, isOutRange);
        }
        else {
 
           G4MaterialPropertiesTable* aMaterialPropertyTable =
                           aMaterial->GetMaterialPropertiesTable();
 
           if(aMaterialPropertyTable){
             G4MaterialPropertyVector* AttenuationLengthVector =
                   aMaterialPropertyTable->GetProperty("RAYLEIGH");
             if(AttenuationLengthVector){
               AttenuationLength = AttenuationLengthVector ->
                                    Value(thePhotonEnergy);
             }
             else{
//               G4cout << "No Rayleigh scattering length specified" << G4endl;
             }
           }
           else{
//             G4cout << "No Rayleigh scattering length specified" << G4endl; 
           }
        }
 
        return AttenuationLength;
}

GetPhysicsTable()

G4PhysicsTable * G4OpRayleigh::GetPhysicsTable ( ) const

inline

Definition at line 176 of file G4OpRayleigh.hh.

{
  return thePhysicsTable;
}

IsApplicable()

G4bool G4OpRayleigh::IsApplicable ( const G4ParticleDefinition &  aParticleType )

inlinevirtual

Reimplemented from G4VProcess.

Definition at line 157 of file G4OpRayleigh.hh.

{
  return ( &aParticleType == G4OpticalPhoton::OpticalPhoton() );
}

PostStepDoIt()

G4VParticleChange * G4OpRayleigh::PostStepDoIt ( const G4Track &  aTrack, const G4Step &  aStep  )

virtual

Reimplemented from G4VDiscreteProcess.

Definition at line 122 of file G4OpRayleigh.cc.

{
        aParticleChange.Initialize(aTrack);
 
        const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
 
        if (verboseLevel>0) {
                G4cout << "Scattering Photon!" << G4endl;
                G4cout << "Old Momentum Direction: "
                       << aParticle->GetMomentumDirection() << G4endl;
                G4cout << "Old Polarization: "
                       << aParticle->GetPolarization() << G4endl;
        }
 
        G4double cosTheta;
        G4ThreeVector OldMomentumDirection, NewMomentumDirection;
        G4ThreeVector OldPolarization, NewPolarization;
 
        do {
           // Try to simulate the scattered photon momentum direction
           // w.r.t. the initial photon momentum direction
 
           G4double CosTheta = G4UniformRand();
           G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
           // consider for the angle 90-180 degrees
           if (G4UniformRand() < 0.5) CosTheta = -CosTheta;
 
           // simulate the phi angle
           G4double rand = twopi*G4UniformRand();
           G4double SinPhi = std::sin(rand);
           G4double CosPhi = std::cos(rand);
 
           // start constructing the new momentum direction
       G4double unit_x = SinTheta * CosPhi; 
       G4double unit_y = SinTheta * SinPhi;  
       G4double unit_z = CosTheta; 
       NewMomentumDirection.set (unit_x,unit_y,unit_z);
 
           // Rotate the new momentum direction into global reference system
           OldMomentumDirection = aParticle->GetMomentumDirection();
           OldMomentumDirection = OldMomentumDirection.unit();
           NewMomentumDirection.rotateUz(OldMomentumDirection);
           NewMomentumDirection = NewMomentumDirection.unit();
 
           // calculate the new polarization direction
           // The new polarization needs to be in the same plane as the new
           // momentum direction and the old polarization direction
           OldPolarization = aParticle->GetPolarization();
           G4double constant = -1./NewMomentumDirection.dot(OldPolarization);
 
           NewPolarization = NewMomentumDirection + constant*OldPolarization;
           NewPolarization = NewPolarization.unit();
 
           // There is a corner case, where the Newmomentum direction
           // is the same as oldpolariztion direction:
           // random generate the azimuthal angle w.r.t. Newmomentum direction
           if (NewPolarization.mag() == 0.) {
              rand = G4UniformRand()*twopi;
              NewPolarization.set(std::cos(rand),std::sin(rand),0.);
              NewPolarization.rotateUz(NewMomentumDirection);
           } else {
              // There are two directions which are perpendicular
              // to the new momentum direction
              if (G4UniformRand() < 0.5) NewPolarization = -NewPolarization;
           }
      
       // simulate according to the distribution cos^2(theta)
           cosTheta = NewPolarization.dot(OldPolarization);
        } while (std::pow(cosTheta,2) < G4UniformRand());
 
        aParticleChange.ProposePolarization(NewPolarization);
        aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
 
        if (verboseLevel>0) {
                G4cout << "New Polarization: " 
                     << NewPolarization << G4endl;
                G4cout << "Polarization Change: "
                     << *(aParticleChange.GetPolarization()) << G4endl;  
                G4cout << "New Momentum Direction: " 
                     << NewMomentumDirection << G4endl;
                G4cout << "Momentum Change: "
                     << *(aParticleChange.GetMomentumDirection()) << G4endl; 
        }
 
        return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}

Member Data Documentation

thePhysicsTable

G4PhysicsTable* G4OpRayleigh::thePhysicsTable

protected

Definition at line 141 of file G4OpRayleigh.hh.

Referenced by DumpPhysicsTable(), G4OpRayleigh(), GetPhysicsTable(), and ~G4OpRayleigh().

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

• G4OpRayleigh.hh
• G4OpRayleigh.cc