#include <G4LowEnergyPolarizedCompton.hh>

Inheritance diagram for G4LowEnergyPolarizedCompton:

Collaboration diagram for G4LowEnergyPolarizedCompton:

Public Member Functions
	G4LowEnergyPolarizedCompton (const G4String &processName="polarLowEnCompt")

	~G4LowEnergyPolarizedCompton ()

G4bool	IsApplicable (const G4ParticleDefinition &definition)

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 74 of file G4LowEnergyPolarizedCompton.hh.

Constructor & Destructor Documentation

G4LowEnergyPolarizedCompton::G4LowEnergyPolarizedCompton ( const G4String & processName = "polarLowEnCompt" )

Definition at line 89 of file G4LowEnergyPolarizedCompton.cc.

   : G4VDiscreteProcess(processName),
     lowEnergyLimit (250*eV),              // initialization
     highEnergyLimit(100*GeV),
     intrinsicLowEnergyLimit(10*eV),
     intrinsicHighEnergyLimit(100*GeV)
 {
   if (lowEnergyLimit < intrinsicLowEnergyLimit ||
       highEnergyLimit > intrinsicHighEnergyLimit)
     {
       G4Exception("G4LowEnergyPolarizedCompton::G4LowEnergyPolarizedCompton()",
                   "OutOfRange", FatalException,
                   "Energy outside intrinsic process validity range!");
     }
 
   crossSectionHandler = new G4RDCrossSectionHandler;
 
 
   G4RDVDataSetAlgorithm* scatterInterpolation = new G4RDLogLogInterpolation;
   G4String scatterFile = "comp/ce-sf-";
   scatterFunctionData = new G4RDCompositeEMDataSet(scatterInterpolation,1.,1.);
   scatterFunctionData->LoadData(scatterFile);
 
   meanFreePathTable = 0;
 
   rangeTest = new G4RDRangeTest;
 
   // For Doppler broadening
   shellData.SetOccupancyData();
 
 
    if (verboseLevel > 0)
      {
        G4cout << GetProcessName() << " is created " << G4endl
           << "Energy range: "
           << lowEnergyLimit / keV << " keV - "
           << highEnergyLimit / GeV << " GeV"
           << G4endl;
      }
 }

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G4LowEnergyPolarizedCompton::~G4LowEnergyPolarizedCompton ( )

Definition at line 132 of file G4LowEnergyPolarizedCompton.cc.

 {
   delete meanFreePathTable;
   delete crossSectionHandler;
   delete scatterFunctionData;
   delete rangeTest;
 }

Member Function Documentation

void G4LowEnergyPolarizedCompton::BuildPhysicsTable ( const G4ParticleDefinition & photon )

virtual

Reimplemented from G4VProcess.

Definition at line 141 of file G4LowEnergyPolarizedCompton.cc.

 {
 
   crossSectionHandler->Clear();
   G4String crossSectionFile = "comp/ce-cs-";
   crossSectionHandler->LoadData(crossSectionFile);
   delete meanFreePathTable;
   meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials();
 
   // For Doppler broadening
   G4String file = "/doppler/shell-doppler";
   shellData.LoadData(file);
 
 }

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G4double G4LowEnergyPolarizedCompton::DumpMeanFreePath	(	const G4Track &	aTrack,
		G4double	previousStepSize,
		G4ForceCondition *	condition
	)

inline

Definition at line 89 of file G4LowEnergyPolarizedCompton.hh.

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

condition

G4double condition(const G4ErrorSymMatrix &m)

G4LowEnergyPolarizedCompton::GetMeanFreePath

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

Definition: G4LowEnergyPolarizedCompton.cc:690

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G4double G4LowEnergyPolarizedCompton::GetMeanFreePath	(	const G4Track &	aTrack,
		G4double	previousStepSize,
		G4ForceCondition *	condition
	)

protectedvirtual

Implements G4VDiscreteProcess.

Definition at line 690 of file G4LowEnergyPolarizedCompton.cc.

 {
   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;
 }

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G4bool G4LowEnergyPolarizedCompton::IsApplicable ( const G4ParticleDefinition & definition )

virtual

Reimplemented from G4VProcess.

Definition at line 684 of file G4LowEnergyPolarizedCompton.cc.

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

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G4VParticleChange * G4LowEnergyPolarizedCompton::PostStepDoIt	(	const G4Track &	aTrack,
		const G4Step &	aStep
	)

virtual

Doppler Broadeing

Reimplemented from G4VDiscreteProcess.

Definition at line 156 of file G4LowEnergyPolarizedCompton.cc.

 {
   // The scattered gamma energy is sampled according to Klein - Nishina formula.
   // The random number techniques of Butcher & Messel are used (Nuc Phys 20(1960),15).
   // GEANT4 internal units
   //
   // Note : Effects due to binding of atomic electrons are negliged.
 
   aParticleChange.Initialize(aTrack);
 
   // Dynamic particle quantities
   const G4DynamicParticle* incidentPhoton = aTrack.GetDynamicParticle();
   G4double gammaEnergy0 = incidentPhoton->GetKineticEnergy();
   G4ThreeVector gammaPolarization0 = incidentPhoton->GetPolarization();
 
   //  gammaPolarization0 = gammaPolarization0.unit(); //
 
   // Protection: a polarisation parallel to the
   // direction causes problems;
   // in that case find a random polarization
 
   G4ThreeVector gammaDirection0 = incidentPhoton->GetMomentumDirection();
   // ---- MGP ---- Next two lines commented out to remove compilation warnings
   // G4double scalarproduct = gammaPolarization0.dot(gammaDirection0);
   // G4double angle = gammaPolarization0.angle(gammaDirection0);
 
   // 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
 
   // Within energy limit?
 
   if(gammaEnergy0 <= lowEnergyLimit)
     {
       aParticleChange.ProposeTrackStatus(fStopAndKill);
       aParticleChange.ProposeEnergy(0.);
       aParticleChange.ProposeLocalEnergyDeposit(gammaEnergy0);
       return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep);
     }
 
   G4double E0_m = gammaEnergy0 / electron_mass_c2 ;
 
   // Select randomly one element in the current material
 
   const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple();
   G4int Z = crossSectionHandler->SelectRandomAtom(couple,gammaEnergy0);
 
   // Sample the energy and the polarization of the scattered photon
 
   G4double epsilon, epsilonSq, onecost, sinThetaSqr, greject ;
 
   G4double epsilon0 = 1./(1. + 2*E0_m);
   G4double epsilon0Sq = epsilon0*epsilon0;
   G4double alpha1   = - std::log(epsilon0);
   G4double alpha2 = 0.5*(1.- epsilon0Sq);
 
   G4double wlGamma = h_Planck*c_light/gammaEnergy0;
   G4double gammaEnergy1;
   G4ThreeVector gammaDirection1;
 
   do {
     if ( alpha1/(alpha1+alpha2) > G4UniformRand() )
       {
     epsilon   = std::exp(-alpha1*G4UniformRand());  
     epsilonSq = epsilon*epsilon; 
       }
     else 
       {
     epsilonSq = epsilon0Sq + (1.- epsilon0Sq)*G4UniformRand();
     epsilon   = std::sqrt(epsilonSq);
       }
 
     onecost = (1.- epsilon)/(epsilon*E0_m);
     sinThetaSqr   = onecost*(2.-onecost);
 
     // Protection
     if (sinThetaSqr > 1.)
       {
     if (verboseLevel>0) G4cout
       << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
       << "sin(theta)**2 = "
       << sinThetaSqr
       << "; set to 1"
       << G4endl;
     sinThetaSqr = 1.;
       }
     if (sinThetaSqr < 0.)
       {
     if (verboseLevel>0) G4cout
       << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
       << "sin(theta)**2 = "
       << sinThetaSqr
       << "; set to 0"
       << G4endl;
     sinThetaSqr = 0.;
       }
     // End protection
 
     G4double x =  std::sqrt(onecost/2.) / (wlGamma/cm);;
     G4double scatteringFunction = scatterFunctionData->FindValue(x,Z-1);
     greject = (1. - epsilon*sinThetaSqr/(1.+ epsilonSq))*scatteringFunction;
 
   } while(greject < G4UniformRand()*Z);
 
 
   // ****************************************************
   //        Phi determination
   // ****************************************************
 
   G4double phi = SetPhi(epsilon,sinThetaSqr);
 
   //
   // scattered gamma angles. ( Z - axis along the parent gamma)
   //
 
   G4double cosTheta = 1. - onecost;
 
   // Protection
 
   if (cosTheta > 1.)
     {
       if (verboseLevel>0) G4cout
     << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
     << "cosTheta = "
     << cosTheta
     << "; set to 1"
     << G4endl;
       cosTheta = 1.;
     }
   if (cosTheta < -1.)
     {
       if (verboseLevel>0) G4cout 
     << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
     << "cosTheta = " 
     << cosTheta
     << "; set to -1"
     << G4endl;
       cosTheta = -1.;
     }
   // End protection      
   
   
   G4double sinTheta = std::sqrt (sinThetaSqr);
   
   // Protection
   if (sinTheta > 1.)
     {
       if (verboseLevel>0) G4cout 
     << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
     << "sinTheta = " 
     << sinTheta
     << "; set to 1"
     << G4endl;
       sinTheta = 1.;
     }
   if (sinTheta < -1.)
     {
       if (verboseLevel>0) G4cout 
     << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
     << "sinTheta = " 
     << sinTheta
     << "; set to -1" 
     << G4endl;
       sinTheta = -1.;
     }
   // End protection
   
       
   G4double dirx = sinTheta*std::cos(phi);
   G4double diry = sinTheta*std::sin(phi);
   G4double dirz = cosTheta ;
   
 
   // oneCosT , eom
 
 
 
   // Doppler broadening -  Method based on:
   // Y. Namito, S. Ban and H. Hirayama, 
   // "Implementation of the Doppler Broadening of a Compton-Scattered Photon Into the EGS4 Code" 
   // NIM A 349, pp. 489-494, 1994
   
   // Maximum number of sampling iterations
 
   G4int maxDopplerIterations = 1000;
   G4double bindingE = 0.;
   G4double photonEoriginal = epsilon * gammaEnergy0;
   G4double photonE = -1.;
   G4int iteration = 0;
   G4double eMax = gammaEnergy0;
 
   do
     {
       iteration++;
       // Select shell based on shell occupancy
       G4int shell = shellData.SelectRandomShell(Z);
       bindingE = shellData.BindingEnergy(Z,shell);
       
       eMax = gammaEnergy0 - bindingE;
      
       // Randomly sample bound electron momentum (memento: the data set is in Atomic Units)
       G4double pSample = profileData.RandomSelectMomentum(Z,shell);
       // Rescale from atomic units
       G4double pDoppler = pSample * fine_structure_const;
       G4double pDoppler2 = pDoppler * pDoppler;
       G4double var2 = 1. + onecost * E0_m;
       G4double var3 = var2*var2 - pDoppler2;
       G4double var4 = var2 - pDoppler2 * cosTheta;
       G4double var = var4*var4 - var3 + pDoppler2 * var3;
       if (var > 0.)
     {
       G4double varSqrt = std::sqrt(var);        
       G4double scale = gammaEnergy0 / var3;  
           // Random select either root
       if (G4UniformRand() < 0.5) photonE = (var4 - varSqrt) * scale;               
       else photonE = (var4 + varSqrt) * scale;
     } 
       else
     {
       photonE = -1.;
     }
    } while ( iteration <= maxDopplerIterations && 
          (photonE < 0. || photonE > eMax || photonE < eMax*G4UniformRand()) );
  
   // End of recalculation of photon energy with Doppler broadening
   // Revert to original if maximum number of iterations threshold has been reached
   if (iteration >= maxDopplerIterations)
     {
       photonE = photonEoriginal;
       bindingE = 0.;
     }
 
   gammaEnergy1 = photonE;
  
   // G4cout << "--> PHOTONENERGY1 = " << photonE/keV << G4endl;
 
 
 
 
 
 
   //
   // update G4VParticleChange for the scattered photon 
   //
 
   //  gammaEnergy1 = epsilon*gammaEnergy0;
 
 
   // New polarization
 
   G4ThreeVector gammaPolarization1 = SetNewPolarization(epsilon,
                             sinThetaSqr,
                             phi,
                             cosTheta);
 
   // Set new direction
   G4ThreeVector tmpDirection1( dirx,diry,dirz );
   gammaDirection1 = tmpDirection1;
 
   // Change reference frame.
 
   SystemOfRefChange(gammaDirection0,gammaDirection1,
             gammaPolarization0,gammaPolarization1);
 
   if (gammaEnergy1 > 0.)
     {
       aParticleChange.ProposeEnergy( gammaEnergy1 ) ;
       aParticleChange.ProposeMomentumDirection( gammaDirection1 );
       aParticleChange.ProposePolarization( gammaPolarization1 );
     }
   else
     {
       aParticleChange.ProposeEnergy(0.) ;
       aParticleChange.ProposeTrackStatus(fStopAndKill);
     }
 
   //
   // kinematic of the scattered electron
   //
 
   G4double ElecKineEnergy = gammaEnergy0 - gammaEnergy1 -bindingE;
 
 
   // Generate the electron only if with large enough range w.r.t. cuts and safety
 
   G4double safety = aStep.GetPostStepPoint()->GetSafety();
 
 
   if (rangeTest->Escape(G4Electron::Electron(),couple,ElecKineEnergy,safety))
     {
       G4double ElecMomentum = std::sqrt(ElecKineEnergy*(ElecKineEnergy+2.*electron_mass_c2));
       G4ThreeVector ElecDirection((gammaEnergy0 * gammaDirection0 -
                    gammaEnergy1 * gammaDirection1) * (1./ElecMomentum));
       G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(),ElecDirection.unit(),ElecKineEnergy) ;
       aParticleChange.SetNumberOfSecondaries(1);
       aParticleChange.AddSecondary(electron);
       //      aParticleChange.ProposeLocalEnergyDeposit(0.); 
       aParticleChange.ProposeLocalEnergyDeposit(bindingE);
     }
   else
     {
       aParticleChange.SetNumberOfSecondaries(0);
       aParticleChange.ProposeLocalEnergyDeposit(ElecKineEnergy+bindingE);
     }
   
   return G4VDiscreteProcess::PostStepDoIt( aTrack, aStep);
   
 }

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

source/geant4.10.03.p03/examples/advanced/eRosita/physics/include/G4LowEnergyPolarizedCompton.hh
source/geant4.10.03.p03/examples/advanced/eRosita/physics/src/G4LowEnergyPolarizedCompton.cc

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation