#include <G4MuBremsstrahlungModel.hh>

Inheritance diagram for G4MuBremsstrahlungModel:

Public Member Functions
	G4MuBremsstrahlungModel (const G4ParticleDefinition *p=0, const G4String &nam="MuBrem")

virtual	~G4MuBremsstrahlungModel ()

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

virtual void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel)

virtual G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple )

virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kineticEnergy, G4double Z, G4double A, G4double cutEnergy, G4double maxEnergy)

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

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

void	SetLowestKineticEnergy (G4double e)

virtual G4double	MinPrimaryEnergy (const G4Material , const G4ParticleDefinition , G4double)

Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)

virtual	~G4VEmModel ()

virtual void	InitialiseForMaterial (const G4ParticleDefinition , const G4Material )

virtual void	InitialiseForElement (const G4ParticleDefinition *, G4int Z)

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

virtual void	DefineForRegion (const G4Region *)

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

std::vector < G4EmElementSelector * > *	GetElementSelectors ()

void	SetElementSelectors (std::vector< G4EmElementSelector * > *)

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)

G4int	SelectRandomAtomNumber (const G4Material *)

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=0)

void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)

G4ElementData *	GetElementData ()

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

G4bool	UseAngularGeneratorFlag () const

void	SetAngularGeneratorFlag (G4bool)

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	SetForceBuildTable (G4bool val)

void	SetMasterThread (G4bool val)

G4bool	IsMaster () const

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

const G4Element *	GetCurrentElement () const

Protected Member Functions
G4double	ComputMuBremLoss (G4double Z, G4double tkin, G4double cut)

G4double	ComputeMicroscopicCrossSection (G4double tkin, G4double Z, G4double cut)

virtual G4double	ComputeDMicroscopicCrossSection (G4double tkin, G4double Z, G4double gammaEnergy)

void	SetParticle (const G4ParticleDefinition *)

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
const G4ParticleDefinition *	particle

G4NistManager *	nist

G4double	mass

G4double	rmass

G4double	cc

G4double	coeff

G4double	sqrte

G4double	bh

G4double	bh1

G4double	btf

G4double	btf1

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData

G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

size_t	idxTable

Detailed Description

Definition at line 72 of file G4MuBremsstrahlungModel.hh.

Constructor & Destructor Documentation

G4MuBremsstrahlungModel::G4MuBremsstrahlungModel	(	const G4ParticleDefinition *	p = `0`,
		const G4String &	nam = `"MuBrem"`
	)

Definition at line 92 of file G4MuBremsstrahlungModel.cc.

References cc, coeff, G4Gamma::Gamma(), G4NistManager::GetA27(), python.hepunit::GeV, G4NistManager::Instance(), mass, nist, rmass, and SetParticle().

   : G4VEmModel(nam),
     particle(0),
     sqrte(sqrt(G4Exp(1.))),
     bh(202.4),
     bh1(446.),
     btf(183.),
     btf1(1429.),
     fParticleChange(0),
     lowestKinEnergy(1.0*GeV),
     minThreshold(0.9*keV)
 {
   theGamma = G4Gamma::Gamma();
   nist = G4NistManager::Instance();
 
   lowestKinEnergy = 1.*GeV;  
 
   mass = rmass = cc = coeff = 1.0;
 
   if(0.0 == fDN[1]) {
     for(G4int i=1; i<93; ++i) {
       G4double dn = 1.54*nist->GetA27(i);
       fDN[i] = dn;
       if(1 < i) {
     fDN[i] /= std::pow(dn, 1./G4double(i));
       }
     }
   }
 
   if(p) { SetParticle(p); }
 }

G4MuBremsstrahlungModel::~G4MuBremsstrahlungModel ( )

virtual

Definition at line 127 of file G4MuBremsstrahlungModel.cc.

128 {}

Member Function Documentation

G4double G4MuBremsstrahlungModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	,
		G4double	kineticEnergy,
		G4double	Z,
		G4double	A,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 339 of file G4MuBremsstrahlungModel.cc.

References ComputeMicroscopicCrossSection(), and G4INCL::Math::min().

 {
   G4double cross = 0.0;
   if (kineticEnergy <= lowestKinEnergy) return cross;
   G4double tmax = std::min(maxEnergy, kineticEnergy);
   G4double cut  = std::min(cutEnergy, kineticEnergy);
   if(cut < minThreshold) cut = minThreshold;
   if (cut >= tmax) return cross;
 
   cross = ComputeMicroscopicCrossSection (kineticEnergy, Z, cut);
   if(tmax < kineticEnergy) {
     cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
   }
   return cross;
 }

G4double G4MuBremsstrahlungModel::ComputeDEDXPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	,
		G4double	kineticEnergy,
		G4double	cutEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 172 of file G4MuBremsstrahlungModel.cc.

References ComputMuBremLoss(), G4Material::GetAtomicNumDensityVector(), G4Material::GetElementVector(), G4Material::GetNumberOfElements(), and G4INCL::Math::min().

 {
   G4double dedx = 0.0;
   if (kineticEnergy <= lowestKinEnergy) { return dedx; }
 
   G4double tmax = kineticEnergy;
   G4double cut  = std::min(cutEnergy,tmax);
   if(cut < minThreshold) { cut = minThreshold; }
 
   const G4ElementVector* theElementVector = material->GetElementVector();
   const G4double* theAtomicNumDensityVector =
     material->GetAtomicNumDensityVector();
 
   //  loop for elements in the material
   for (size_t i=0; i<material->GetNumberOfElements(); i++) {
 
     G4double loss = 
       ComputMuBremLoss((*theElementVector)[i]->GetZ(), kineticEnergy, cut);
 
     dedx += loss*theAtomicNumDensityVector[i];
   }
   //  G4cout << "BR e= " << kineticEnergy << "  dedx= " << dedx << G4endl;
   if(dedx < 0.) dedx = 0.;
   return dedx;
 }

G4double G4MuBremsstrahlungModel::ComputeDMicroscopicCrossSection	(	G4double	tkin,
		G4double	Z,
		G4double	gammaEnergy
	)

protectedvirtual

Reimplemented in G4hBremsstrahlungModel.

Definition at line 284 of file G4MuBremsstrahlungModel.cc.

References test::b, bh, bh1, btf, btf1, coeff, python.hepunit::electron_mass_c2, fe, G4Log(), G4lrint(), G4NistManager::GetZ13(), iz, mass, nist, rmass, sqrte, and test::v.

Referenced by ComputeMicroscopicCrossSection(), ComputMuBremLoss(), and SampleSecondaries().

 {
   G4double dxsection = 0.;
 
   if(gammaEnergy > tkin) { return dxsection; }
 
   G4double E = tkin + mass ;
   G4double v = gammaEnergy/E ;
   G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
   G4double rab0  = delta*sqrte ;
 
   G4int iz = G4lrint(Z);
   if(iz < 1) { iz = 1; }
   else if(iz > 92) { iz = 92; }
 
   G4double z13 = 1.0/nist->GetZ13(iz);
   G4double dnstar = fDN[iz];
 
   G4double b,b1;
 
   if(1 == iz) {
     b  = bh;
     b1 = bh1;
   } else {
     b  = btf;
     b1 = btf1;
   }
 
   // nucleus contribution logarithm
   G4double rab1=b*z13;
   G4double fn=G4Log(rab1/(dnstar*(electron_mass_c2+rab0*rab1))*
               (mass+delta*(dnstar*sqrte-2.))) ;
   if(fn <0.) { fn = 0.; }
   // electron contribution logarithm
   G4double epmax1=E/(1.+0.5*mass*rmass/E) ;
   G4double fe=0.;
   if(gammaEnergy<epmax1)
   {
     G4double rab2=b1*z13*z13 ;
     fe=G4Log(rab2*mass/((1.+delta*rmass/(electron_mass_c2*sqrte))*
                               (electron_mass_c2+rab0*rab2))) ;
     if(fe<0.) { fe=0.; }
   }
 
   dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn*Z + fe)/gammaEnergy;
 
   return dxsection;
 }

G4double G4MuBremsstrahlungModel::ComputeMicroscopicCrossSection	(	G4double	tkin,
		G4double	Z,
		G4double	cut
	)

protected

Definition at line 241 of file G4MuBremsstrahlungModel.cc.

References ComputeDMicroscopicCrossSection(), G4Exp(), G4Log(), and mass.

Referenced by ComputeCrossSectionPerAtom().

 {
   G4double totalEnergy = tkin + mass;
   static const G4double ak1 = 2.3;
   static const G4int    k2  = 4;
   G4double cross = 0.;
 
   if(cut >= tkin) return cross;
 
   G4double vcut = cut/totalEnergy;
   G4double vmax = tkin/totalEnergy;
 
   G4double aaa = G4Log(vcut);
   G4double bbb = G4Log(vmax);
   G4int    kkk = (G4int)((bbb-aaa)/ak1)+k2 ;
   if(kkk < 1) { kkk = 1; }
 
   G4double hhh = (bbb-aaa)/G4double(kkk);
 
   G4double aa = aaa;
 
   for(G4int l=0; l<kkk; l++)
   {
     for(G4int i=0; i<6; i++)
     {
       G4double ep = G4Exp(aa + xgi[i]*hhh)*totalEnergy;
       cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
     }
     aa += hhh;
   }
 
   cross *=hhh;
 
   //G4cout << "BR e= " << tkin<< "  cross= " << cross/barn << G4endl;
 
   return cross;
 }

G4double G4MuBremsstrahlungModel::ComputMuBremLoss	(	G4double	Z,
		G4double	tkin,
		G4double	cut
	)

protected

Definition at line 204 of file G4MuBremsstrahlungModel.cc.

References ComputeDMicroscopicCrossSection(), and mass.

Referenced by ComputeDEDXPerVolume().

 {
   G4double totalEnergy = mass + tkin;
   static const G4double ak1 = 0.05;
   static const G4int    k2=5;
   G4double loss = 0.;
 
   G4double vcut = cut/totalEnergy;
   G4double vmax = tkin/totalEnergy;
 
   G4double aaa = 0.;
   G4double bbb = vcut;
   if(vcut>vmax) { bbb = vmax; }
   G4int kkk = (G4int)((bbb-aaa)/ak1)+k2;
   if(kkk < 1) { kkk = 1; }
 
   G4double hhh=(bbb-aaa)/G4double(kkk);
 
   G4double aa = aaa;
   for(G4int l=0; l<kkk; l++)
   {
     for(G4int i=0; i<6; i++)
     {
       G4double ep = (aa + xgi[i]*hhh)*totalEnergy;
       loss += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
     }
     aa += hhh;
   }
 
   loss *=hhh*totalEnergy ;
 
   return loss;
 }

void G4MuBremsstrahlungModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &	cuts
	)

virtual

Implements G4VEmModel.

Definition at line 149 of file G4MuBremsstrahlungModel.cc.

References G4VEmModel::GetParticleChangeForLoss(), G4VEmModel::InitialiseElementSelectors(), G4VEmModel::IsMaster(), particle, and SetParticle().

 {
   if(p) { SetParticle(p); }
 
   if(IsMaster() && p == particle) { InitialiseElementSelectors(p, cuts); }
 
   // define pointer to G4ParticleChange
   if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
 }

void G4MuBremsstrahlungModel::InitialiseLocal	(	const G4ParticleDefinition *	p,
		G4VEmModel *	masterModel
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 162 of file G4MuBremsstrahlungModel.cc.

References G4VEmModel::GetElementSelectors(), particle, and G4VEmModel::SetElementSelectors().

 {
   if(p == particle) {
     SetElementSelectors(masterModel->GetElementSelectors());
   }
 }

G4double G4MuBremsstrahlungModel::MinEnergyCut	(	const G4ParticleDefinition *	,
		const G4MaterialCutsCouple *
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 132 of file G4MuBremsstrahlungModel.cc.

 {
   return minThreshold;
 }

G4double G4MuBremsstrahlungModel::MinPrimaryEnergy	(	const G4Material *	,
		const G4ParticleDefinition *	,
		G4double	cut
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 140 of file G4MuBremsstrahlungModel.cc.

References G4INCL::Math::max().

 {
   return std::max(lowestKinEnergy,cut);
 }

void G4MuBremsstrahlungModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vdp,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	dp,
		G4double	tmin,
		G4double	maxEnergy
	)

virtual

Implements G4VEmModel.

Definition at line 362 of file G4MuBremsstrahlungModel.cc.

References ComputeDMicroscopicCrossSection(), func1(), func2(), G4Exp(), G4Log(), G4UniformRand, G4InuclParticleNames::gam, G4DynamicParticle::GetKineticEnergy(), G4DynamicParticle::GetMomentumDirection(), G4Element::GetZ(), mass, python.hepunit::MeV, G4INCL::Math::min(), particle, CLHEP::Hep3Vector::rotateUz(), G4VEmModel::SelectRandomAtom(), G4ParticleChangeForLoss::SetProposedKineticEnergy(), G4ParticleChangeForLoss::SetProposedMomentumDirection(), python.hepunit::twopi, CLHEP::Hep3Vector::unit(), and test::x.

 {
   G4double kineticEnergy = dp->GetKineticEnergy();
   // check against insufficient energy
   G4double tmax = std::min(kineticEnergy, maxEnergy);
   G4double tmin = std::min(kineticEnergy, minEnergy);
   if(tmin < minThreshold) tmin = minThreshold;
   if(tmin >= tmax) return;
 
   // ===== sampling of energy transfer ======
 
   G4ParticleMomentum partDirection = dp->GetMomentumDirection();
 
   // select randomly one element constituing the material
   const G4Element* anElement = SelectRandomAtom(couple,particle,kineticEnergy);
   G4double Z = anElement->GetZ();
 
   G4double totalEnergy   = kineticEnergy + mass;
   G4double totalMomentum = sqrt(kineticEnergy*(kineticEnergy + 2.0*mass));
 
   G4double func1 = tmin*
     ComputeDMicroscopicCrossSection(kineticEnergy,Z,tmin);
 
   G4double lnepksi, epksi;
   G4double func2;
 
   G4double xmin = G4Log(tmin/MeV);
   G4double xmax = G4Log(kineticEnergy/tmin);
 
   do {
     lnepksi = xmin + G4UniformRand()*xmax;
     epksi   = MeV*G4Exp(lnepksi);
     func2   = epksi*ComputeDMicroscopicCrossSection(kineticEnergy,Z,epksi);
 
   } while(func2 < func1*G4UniformRand());
 
   G4double gEnergy = epksi;
 
   // ===== sample angle =====
 
   G4double gam  = totalEnergy/mass;
   G4double rmax = gam*std::min(1.0, totalEnergy/gEnergy - 1.0);
   G4double rmax2= rmax*rmax;
   G4double x = G4UniformRand()*rmax2/(1.0 + rmax2);
 
   G4double theta = sqrt(x/(1.0 - x))/gam;
   G4double sint  = sin(theta);
   G4double phi   = twopi * G4UniformRand() ;
   G4double dirx  = sint*cos(phi), diry = sint*sin(phi), dirz = cos(theta) ;
 
   G4ThreeVector gDirection(dirx, diry, dirz);
   gDirection.rotateUz(partDirection);
 
   partDirection *= totalMomentum;
   partDirection -= gEnergy*gDirection;
   partDirection = partDirection.unit();
 
   // primary change
   kineticEnergy -= gEnergy;
   fParticleChange->SetProposedKineticEnergy(kineticEnergy);
   fParticleChange->SetProposedMomentumDirection(partDirection);
 
   // save secondary
   G4DynamicParticle* aGamma = 
     new G4DynamicParticle(theGamma,gDirection,gEnergy);
   vdp->push_back(aGamma);
 }

void G4MuBremsstrahlungModel::SetLowestKineticEnergy ( G4double e )

inline

Definition at line 163 of file G4MuBremsstrahlungModel.hh.

 {
   lowestKinEnergy = e;
 }

void G4MuBremsstrahlungModel::SetParticle ( const G4ParticleDefinition * p )

inlineprotected

Definition at line 171 of file G4MuBremsstrahlungModel.hh.

References cc, coeff, G4ParticleDefinition::GetPDGMass(), mass, particle, and rmass.

Referenced by G4MuBremsstrahlungModel(), and Initialise().

 {
   if(!particle) {
     particle = p;
     mass = particle->GetPDGMass();
     rmass=mass/CLHEP::electron_mass_c2 ;
     cc=CLHEP::classic_electr_radius/rmass ;
     coeff= 16.*CLHEP::fine_structure_const*cc*cc/3. ;
   }
 }