#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 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)

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
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
G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

Detailed Description

Definition at line 71 of file G4MuBremsstrahlungModel.hh.

Constructor & Destructor Documentation

◆ G4MuBremsstrahlungModel()

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

Definition at line 82 of file G4MuBremsstrahlungModel.cc.

  : G4VEmModel(nam),
    particle(0),
    sqrte(sqrt(exp(1.))),
    bh(202.4),
    bh1(446.),
    btf(183.),
    btf1(1429.),
    fParticleChange(0),
    lowestKinEnergy(1.0*GeV),
    minThreshold(1.0*keV)
{
  theGamma = G4Gamma::Gamma();
  nist = G4NistManager::Instance();
 
  mass = rmass = cc = coeff = 1.0;
 
  fDN[0] = 0.0;
  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::~G4MuBremsstrahlungModel ( )

virtual

Definition at line 114 of file G4MuBremsstrahlungModel.cc.

{
  size_t n = partialSumSigma.size();
  if(n > 0) {
    for(size_t i=0; i<n; i++) {
      delete partialSumSigma[i];
    }
  }
}

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

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

virtual

Reimplemented from G4VEmModel.

Definition at line 351 of file G4MuBremsstrahlungModel.cc.

{
  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;
}

◆ ComputeDEDXPerVolume()

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

virtual

Reimplemented from G4VEmModel.

Definition at line 184 of file G4MuBremsstrahlungModel.cc.

{
  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;
}

◆ ComputeDMicroscopicCrossSection()

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

protectedvirtual

Reimplemented in G4hBremsstrahlungModel.

Definition at line 296 of file G4MuBremsstrahlungModel.cc.

{
  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 = G4int(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=log(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=log(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;
}

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

◆ ComputeMicroscopicCrossSection()

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

protected

Definition at line 253 of file G4MuBremsstrahlungModel.cc.

{
  G4double totalEnergy = tkin + mass;
  G4double ak1 = 2.3;
  G4int    k2  = 4;
  G4double xgi[]={0.03377,0.16940,0.38069,0.61931,0.83060,0.96623};
  G4double wgi[]={0.08566,0.18038,0.23396,0.23396,0.18038,0.08566};
  G4double cross = 0.;
 
  if(cut >= tkin) return cross;
 
  G4double vcut = cut/totalEnergy;
  G4double vmax = tkin/totalEnergy;
 
  G4double aaa = log(vcut);
  G4double bbb = log(vmax);
  G4int    kkk = (G4int)((bbb-aaa)/ak1)+k2 ;
  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 = exp(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;
}

Referenced by ComputeCrossSectionPerAtom().

◆ ComputMuBremLoss()

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

protected

Definition at line 216 of file G4MuBremsstrahlungModel.cc.

{
  G4double totalEnergy = mass + tkin;
  G4double ak1 = 0.05;
  G4int    k2=5;
  G4double xgi[]={0.03377,0.16940,0.38069,0.61931,0.83060,0.96623};
  G4double wgi[]={0.08566,0.18038,0.23396,0.23396,0.18038,0.08566};
  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 ;
  G4double hhh=(bbb-aaa)/float(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;
}

Referenced by ComputeDEDXPerVolume().

◆ Initialise()

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

virtual

Implements G4VEmModel.

Definition at line 134 of file G4MuBremsstrahlungModel.cc.

{
  if(p) { SetParticle(p); }
 
  // partial cross section is computed for fixed energy
  G4double fixedEnergy = 0.5*HighEnergyLimit();
 
  const G4ProductionCutsTable* theCoupleTable=
        G4ProductionCutsTable::GetProductionCutsTable();
  if(theCoupleTable) {
    G4int numOfCouples = theCoupleTable->GetTableSize();
 
    G4int nn = partialSumSigma.size();
    G4int nc = cuts.size();
 
    // do we need to perform initialisation?
    if(nn == numOfCouples) { return; }
 
    // clear old data    
    if(nn > 0) {
      for (G4int ii=0; ii<nn; ii++){
    G4DataVector* a = partialSumSigma[ii];
    if ( a ) { delete a; }
      } 
      partialSumSigma.clear();
    }
    // fill new data
    if (numOfCouples>0) {
      for (G4int i=0; i<numOfCouples; i++) {
        G4double cute = DBL_MAX;
 
    // protection for usage with extrapolator
        if(i < nc) { cute = cuts[i]; }
 
        const G4MaterialCutsCouple* couple = 
      theCoupleTable->GetMaterialCutsCouple(i);
    const G4Material* material = couple->GetMaterial();
    G4DataVector* dv = ComputePartialSumSigma(material,fixedEnergy,cute);
    partialSumSigma.push_back(dv);
      }
    }
  }
 
  // define pointer to G4ParticleChange
  if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
}

◆ MinEnergyCut()

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

virtual

Definition at line 126 of file G4MuBremsstrahlungModel.cc.

{
  return minThreshold;
}

◆ SampleSecondaries()

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

virtual

Implements G4VEmModel.

Definition at line 403 of file G4MuBremsstrahlungModel.cc.

{
  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);
  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 = log(tmin/MeV);
  G4double xmax = log(kineticEnergy/tmin);
 
  do {
    lnepksi = xmin + G4UniformRand()*xmax;
    epksi   = MeV*exp(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);
}

◆ SetLowestKineticEnergy()

void G4MuBremsstrahlungModel::SetLowestKineticEnergy ( G4double e )

inline

Definition at line 160 of file G4MuBremsstrahlungModel.hh.

{
  lowestKinEnergy = e;
}

◆ SetParticle()

void G4MuBremsstrahlungModel::SetParticle ( const G4ParticleDefinition * p )

inlineprotected

Definition at line 168 of file G4MuBremsstrahlungModel.hh.

{
  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. ;
  }
}