#include <G4eBremsstrahlungRelModel.hh>

Inheritance diagram for G4eBremsstrahlungRelModel:

Public Member Functions
	G4eBremsstrahlungRelModel (const G4ParticleDefinition *p=0, const G4String &nam="eBremLPM")

virtual	~G4eBremsstrahlungRelModel ()

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

virtual G4double	ComputeDEDXPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy)

virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double tkin, G4double Z, G4double, G4double cutEnergy, G4double maxEnergy=DBL_MAX)

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

virtual void	SetupForMaterial (const G4ParticleDefinition , const G4Material , G4double)

void	SetLPMconstant (G4double val)

G4double	LPMconstant () const

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 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	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., 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 )

virtual void	SetupForMaterial (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	DefineForRegion (const G4Region *)

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

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)

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=0)

void	SetCrossSectionTable (G4PhysicsTable *)

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

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	ForceBuildTable (G4bool val)

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

const G4Element *	GetCurrentElement () const

Protected Member Functions
virtual G4double	ComputeDXSectionPerAtom (G4double gammaEnergy)

void	SetCurrentElement (const G4double)

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 *)

Protected Attributes
G4NistManager *	nist

const G4ParticleDefinition *	particle

G4ParticleDefinition *	theGamma

G4ParticleChangeForLoss *	fParticleChange

G4double	bremFactor

G4double	particleMass

G4double	kinEnergy

G4double	totalEnergy

G4double	currentZ

G4double	densityFactor

G4double	densityCorr

G4bool	isElectron

Protected Attributes inherited from G4VEmModel
G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

Detailed Description

Definition at line 60 of file G4eBremsstrahlungRelModel.hh.

Constructor & Destructor Documentation

◆ G4eBremsstrahlungRelModel()

G4eBremsstrahlungRelModel::G4eBremsstrahlungRelModel	(	const G4ParticleDefinition *	p = `0`,
		const G4String &	nam = `"eBremLPM"`
	)

Definition at line 83 of file G4eBremsstrahlungRelModel.cc.

  : G4VEmModel(nam),
    particle(0),
    bremFactor(fine_structure_const*classic_electr_radius*classic_electr_radius*16./3.),
    isElectron(true),
    fMigdalConstant(classic_electr_radius*electron_Compton_length*electron_Compton_length*4.0*pi),
    fLPMconstant(fine_structure_const*electron_mass_c2*electron_mass_c2/(4.*pi*hbarc)*0.5),
    fXiLPM(0), fPhiLPM(0), fGLPM(0),
    use_completescreening(false),isInitialised(false)
{
  fParticleChange = 0;
  theGamma = G4Gamma::Gamma();
 
  lowKinEnergy = 0.1*GeV;
  SetLowEnergyLimit(lowKinEnergy);  
 
  nist = G4NistManager::Instance();  
 
  SetLPMFlag(true);
  //SetAngularDistribution(new G4ModifiedTsai());
  SetAngularDistribution(new G4DipBustGenerator());
 
  particleMass = kinEnergy = totalEnergy = currentZ = z13 = z23 = lnZ = Fel 
    = Finel = fCoulomb = fMax = densityFactor = densityCorr = lpmEnergy 
    = xiLPM = phiLPM = gLPM = klpm = kp = 0.0;
 
  energyThresholdLPM = 1.e39;
 
  InitialiseConstants();
  if(p) { SetParticle(p); }
}

◆ ~G4eBremsstrahlungRelModel()

G4eBremsstrahlungRelModel::~G4eBremsstrahlungRelModel ( )

virtual

Definition at line 129 of file G4eBremsstrahlungRelModel.cc.

130{

131}

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4eBremsstrahlungRelModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	p,
		G4double	tkin,
		G4double	Z,
		G4double	,
		G4double	cutEnergy,
		G4double	maxEnergy = `DBL_MAX`
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 260 of file G4eBremsstrahlungRelModel.cc.

{
  if(!particle) { SetParticle(p); }
  if(kineticEnergy < lowKinEnergy) { return 0.0; }
  G4double cut  = std::min(cutEnergy, kineticEnergy);
  G4double tmax = std::min(maxEnergy, kineticEnergy);
 
  if(cut >= tmax) { return 0.0; }
 
  SetCurrentElement(Z);
 
  G4double cross = ComputeXSectionPerAtom(cut);
 
  // allow partial integration
  if(tmax < kinEnergy) { cross -= ComputeXSectionPerAtom(tmax); }
  
  cross *= Z*Z*bremFactor;
 
  return cross;
}

◆ ComputeDEDXPerVolume()

G4double G4eBremsstrahlungRelModel::ComputeDEDXPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 190 of file G4eBremsstrahlungRelModel.cc.

{
  if(!particle) { SetParticle(p); }
  if(kineticEnergy < lowKinEnergy) { return 0.0; }
  G4double cut = std::min(cutEnergy, kineticEnergy);
  if(cut == 0.0) { return 0.0; }
 
  SetupForMaterial(particle, material,kineticEnergy);
 
  const G4ElementVector* theElementVector = material->GetElementVector();
  const G4double* theAtomicNumDensityVector = material->GetAtomicNumDensityVector();
 
  G4double dedx = 0.0;
 
  //  loop for elements in the material
  for (size_t i=0; i<material->GetNumberOfElements(); i++) {
 
    G4VEmModel::SetCurrentElement((*theElementVector)[i]);
    SetCurrentElement((*theElementVector)[i]->GetZ());
 
    dedx += theAtomicNumDensityVector[i]*currentZ*currentZ*ComputeBremLoss(cut);
  }
  dedx *= bremFactor;
 
 
  return dedx;
}

◆ ComputeDXSectionPerAtom()

G4double G4eBremsstrahlungRelModel::ComputeDXSectionPerAtom ( G4double gammaEnergy )

protectedvirtual

Reimplemented in G4SeltzerBergerModel.

Definition at line 428 of file G4eBremsstrahlungRelModel.cc.

{
 
  if(gammaEnergy < 0.0) { return 0.0; }
 
  G4double y = gammaEnergy/totalEnergy;
 
  G4double main=0.,secondTerm=0.;
 
  if (use_completescreening|| currentZ<5) {
    // ** form factors complete screening case **      
    main   = (3./4.*y*y - y + 1.) * ( (Fel-fCoulomb) + Finel/currentZ );
    secondTerm = (1.-y)/12.*(1.+1./currentZ);
  }
  else {
    // ** intermediate screening using Thomas-Fermi FF from Tsai only valid for Z>=5** 
    G4double dd=100.*electron_mass_c2*y/(totalEnergy-gammaEnergy);
    G4double gg=dd/z13;
    G4double eps=dd/z23;
    G4double phi1=Phi1(gg,currentZ),  phi1m2=Phi1M2(gg,currentZ);
    G4double psi1=Psi1(eps,currentZ),  psi1m2=Psi1M2(eps,currentZ);
    
    main   = (3./4.*y*y - y + 1.) * ( (0.25*phi1-1./3.*lnZ-fCoulomb) + (0.25*psi1-2./3.*lnZ)/currentZ );
    secondTerm = (1.-y)/8.*(phi1m2+psi1m2/currentZ);
  }
  G4double cross = main+secondTerm;
  return cross;
}

Referenced by SampleSecondaries().

◆ Initialise()

void G4eBremsstrahlungRelModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &	cuts
	)

virtual

Implements G4VEmModel.

Reimplemented in G4SeltzerBergerModel.

Definition at line 172 of file G4eBremsstrahlungRelModel.cc.

{
  if(p) { SetParticle(p); }
 
  lowKinEnergy  = LowEnergyLimit();
 
  currentZ = 0.;
 
  InitialiseElementSelectors(p, cuts);
 
  if(isInitialised) { return; }
  fParticleChange = GetParticleChangeForLoss();
  isInitialised = true;
}

Referenced by G4SeltzerBergerModel::Initialise().

◆ LPMconstant()

G4double G4eBremsstrahlungRelModel::LPMconstant ( ) const

inline

Definition at line 250 of file G4eBremsstrahlungRelModel.hh.

{
  return fLPMconstant;
}

◆ SampleSecondaries()

void G4eBremsstrahlungRelModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vdp,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	dp,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

virtual

Implements G4VEmModel.

Reimplemented in G4SeltzerBergerModel.

Definition at line 463 of file G4eBremsstrahlungRelModel.cc.

{
  G4double kineticEnergy = dp->GetKineticEnergy();
  if(kineticEnergy < lowKinEnergy) { return; }
  G4double cut  = std::min(cutEnergy, kineticEnergy);
  G4double emax = std::min(maxEnergy, kineticEnergy);
  if(cut >= emax) { return; }
 
  SetupForMaterial(particle, couple->GetMaterial(), kineticEnergy);
 
  const G4Element* elm = 
    SelectRandomAtom(couple,particle,kineticEnergy,cut,emax);
  SetCurrentElement(elm->GetZ());
 
  kinEnergy   = kineticEnergy;
  totalEnergy = kineticEnergy + particleMass;
  densityCorr = densityFactor*totalEnergy*totalEnergy;
 
  //G4double fmax= fMax;
  G4bool highe = true;
  if(totalEnergy < energyThresholdLPM) { highe = false; }
 
  G4double xmin = log(cut*cut + densityCorr);
  G4double xmax = log(emax*emax  + densityCorr);
  G4double gammaEnergy, f, x; 
 
  do {
    x = exp(xmin + G4UniformRand()*(xmax - xmin)) - densityCorr;
    if(x < 0.0) { x = 0.0; }
    gammaEnergy = sqrt(x);
    if(highe) { f = ComputeRelDXSectionPerAtom(gammaEnergy); }
    else      { f = ComputeDXSectionPerAtom(gammaEnergy); }
 
    if ( f > fMax ) {
      G4cout << "### G4eBremsstrahlungRelModel Warning: Majoranta exceeded! "
         << f << " > " << fMax
         << " Egamma(MeV)= " << gammaEnergy
         << " Ee(MeV)= " << kineticEnergy
         << "  " << GetName()
         << G4endl;
    }
 
  } while (f < fMax*G4UniformRand());
 
  //
  // angles of the emitted gamma. ( Z - axis along the parent particle)
  // use general interface
  //
 
  G4ThreeVector gammaDirection = 
    GetAngularDistribution()->SampleDirection(dp, totalEnergy-gammaEnergy,
                          G4lrint(currentZ), 
                          couple->GetMaterial());
 
  // create G4DynamicParticle object for the Gamma
  G4DynamicParticle* gamma = new G4DynamicParticle(theGamma,gammaDirection,
                           gammaEnergy);
  vdp->push_back(gamma);
  
  G4double totMomentum = sqrt(kineticEnergy*(totalEnergy + electron_mass_c2));
  G4ThreeVector direction = (totMomentum*dp->GetMomentumDirection()
                 - gammaEnergy*gammaDirection).unit();
 
  // energy of primary
  G4double finalE = kineticEnergy - gammaEnergy;
 
  // stop tracking and create new secondary instead of primary
  if(gammaEnergy > SecondaryThreshold()) {
    fParticleChange->ProposeTrackStatus(fStopAndKill);
    fParticleChange->SetProposedKineticEnergy(0.0);
    G4DynamicParticle* el = 
      new G4DynamicParticle(const_cast<G4ParticleDefinition*>(particle),
                direction, finalE);
    vdp->push_back(el);
 
    // continue tracking
  } else {
    fParticleChange->SetProposedMomentumDirection(direction);
    fParticleChange->SetProposedKineticEnergy(finalE);
  }
}

◆ SetCurrentElement()

void G4eBremsstrahlungRelModel::SetCurrentElement ( const G4double Z )

inlineprotected

Definition at line 185 of file G4eBremsstrahlungRelModel.hh.

{
  if(Z != currentZ) {
    currentZ = Z;
 
    G4int iz = G4int(Z);
    z13 = nist->GetZ13(iz);
    z23 = z13*z13;
    lnZ = nist->GetLOGZ(iz);
 
    if (iz <= 4) {
      Fel = Fel_light[iz];  
      Finel = Finel_light[iz] ; 
    }
    else {
      Fel = facFel - lnZ/3. ;
      Finel = facFinel - 2.*lnZ/3. ;
    }
 
    fCoulomb = GetCurrentElement()->GetfCoulomb();
    fMax = Fel-fCoulomb + Finel/currentZ  +  (1.+1./currentZ)/12.;
  }
}

Referenced by ComputeCrossSectionPerAtom(), ComputeDEDXPerVolume(), SampleSecondaries(), and G4SeltzerBergerModel::SampleSecondaries().

◆ SetLPMconstant()

void G4eBremsstrahlungRelModel::SetLPMconstant ( G4double val )

inline

Definition at line 242 of file G4eBremsstrahlungRelModel.hh.

{
  fLPMconstant = val;
}

◆ SetupForMaterial()

void G4eBremsstrahlungRelModel::SetupForMaterial	(	const G4ParticleDefinition *	,
		const G4Material *	mat,
		G4double	kineticEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 145 of file G4eBremsstrahlungRelModel.cc.

{
  densityFactor = mat->GetElectronDensity()*fMigdalConstant;
  lpmEnergy = mat->GetRadlen()*fLPMconstant;
 
  // Threshold for LPM effect (i.e. below which LPM hidden by density effect) 
  if (LPMFlag()) {
    energyThresholdLPM=sqrt(densityFactor)*lpmEnergy;
  } else {
     energyThresholdLPM=1.e39;   // i.e. do not use LPM effect
  }
  // calculate threshold for density effect
  kinEnergy   = kineticEnergy;
  totalEnergy = kineticEnergy + particleMass;
  densityCorr = densityFactor*totalEnergy*totalEnergy;
 
  // define critical gamma energies (important for integration/dicing)
  klpm=totalEnergy*totalEnergy/lpmEnergy;
  kp=sqrt(densityCorr);
    
}