#include <G4MuBremsstrahlungModel.hh>

Inheritance diagram for G4MuBremsstrahlungModel:

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

	~G4MuBremsstrahlungModel ()=default

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

void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel) override

G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple ) override

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

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

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

void	SetLowestKineticEnergy (G4double e)

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

G4MuBremsstrahlungModel &	operator= (const G4MuBremsstrahlungModel &right)=delete

	G4MuBremsstrahlungModel (const G4MuBremsstrahlungModel &)=delete

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 void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel)

virtual void	InitialiseForMaterial (const G4ParticleDefinition , const G4Material )

virtual void	InitialiseForElement (const G4ParticleDefinition *, G4int Z)

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	GetPartialCrossSection (const G4Material , G4int level, const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

virtual G4double	ComputeCrossSectionPerShell (const G4ParticleDefinition *, G4int Z, G4int shellIdx, G4double kinEnergy, 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 , const G4double &length, G4double &eloss)

virtual G4double	Value (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	MinPrimaryEnergy (const G4Material , const G4ParticleDefinition , G4double cut=0.0)

virtual G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple )

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

virtual void	DefineForRegion (const G4Region *)

virtual void	FillNumberOfSecondaries (G4int &numberOfTriplets, G4int &numberOfRecoil)

virtual void	ModelDescription (std::ostream &outFile) const

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)

const G4Element *	SelectRandomAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectTargetAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double logKineticEnergy, 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)

const G4Element *	GetCurrentElement (const G4Material *mat=nullptr) const

G4int	SelectRandomAtomNumber (const G4Material *) const

const G4Isotope *	GetCurrentIsotope (const G4Element *elm=nullptr) const

G4int	SelectIsotopeNumber (const G4Element *) const

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=nullptr)

void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)

G4ElementData *	GetElementData ()

G4PhysicsTable *	GetCrossSectionTable ()

G4VEmFluctuationModel *	GetModelOfFluctuations ()

G4VEmAngularDistribution *	GetAngularDistribution ()

G4VEmModel *	GetTripletModel ()

void	SetTripletModel (G4VEmModel *)

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) const

void	SetPolarAngleLimit (G4double)

void	SetSecondaryThreshold (G4double)

void	SetLPMFlag (G4bool val)

void	SetDeexcitationFlag (G4bool val)

void	SetForceBuildTable (G4bool val)

void	SetFluctuationFlag (G4bool val)

void	SetMasterThread (G4bool val)

G4bool	IsMaster () const

void	SetUseBaseMaterials (G4bool val)

G4bool	UseBaseMaterials () const

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

G4bool	IsLocked () const

void	SetLocked (G4bool)

G4VEmModel &	operator= (const G4VEmModel &right)=delete

	G4VEmModel (const G4VEmModel &)=delete

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 = nullptr

G4ParticleDefinition *	theGamma = nullptr

G4ParticleChangeForLoss *	fParticleChange = nullptr

G4NistManager *	nist = nullptr

G4double	mass = 1.0

G4double	rmass = 1.0

G4double	cc = 1.0

G4double	coeff = 1.0

G4double	sqrte

G4double	bh = 202.4

G4double	bh1 = 446.

G4double	btf = 183.

G4double	btf1 = 1429.

G4double	lowestKinEnergy

G4double	minThreshold

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData = nullptr

G4VParticleChange *	pParticleChange = nullptr

G4PhysicsTable *	xSectionTable = nullptr

const G4Material *	pBaseMaterial = nullptr

const std::vector< G4double > *	theDensityFactor = nullptr

const std::vector< G4int > *	theDensityIdx = nullptr

G4double	inveplus

G4double	pFactor = 1.0

size_t	currentCoupleIndex = 0

size_t	basedCoupleIndex = 0

G4bool	lossFlucFlag = true

Static Protected Attributes
static const G4double	xgi [6]

static const G4double	wgi [6]

static G4double	fDN [93] = {0.0}

Detailed Description

Definition at line 69 of file G4MuBremsstrahlungModel.hh.

Constructor & Destructor Documentation

◆ G4MuBremsstrahlungModel() [1/2]

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

explicit

Definition at line 83 of file G4MuBremsstrahlungModel.cc.

  : G4VEmModel(nam),
    sqrte(std::sqrt(G4Exp(1.))),
    lowestKinEnergy(0.1*CLHEP::GeV),
    minThreshold(0.9*CLHEP::keV)
{
  theGamma = G4Gamma::Gamma();
  nist = G4NistManager::Instance();  
 
  SetAngularDistribution(new G4ModifiedMephi());
  if(nullptr != p) { SetParticle(p); }
}

◆ ~G4MuBremsstrahlungModel()

G4MuBremsstrahlungModel::~G4MuBremsstrahlungModel ( )

default

◆ G4MuBremsstrahlungModel() [2/2]

G4MuBremsstrahlungModel::G4MuBremsstrahlungModel ( const G4MuBremsstrahlungModel & )

delete

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

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

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 310 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
	)

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 162 of file G4MuBremsstrahlungModel.cc.

{
  G4double dedx = 0.0;
  if (kineticEnergy <= lowestKinEnergy) { return dedx; }
 
  G4double cut = std::max(cutEnergy, minThreshold);
  cut = std::min(cut, kineticEnergy);
 
  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;
  dedx = std::max(dedx, 0.);
  return dedx;
}

◆ ComputeDMicroscopicCrossSection()

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

protectedvirtual

Reimplemented in G4hBremsstrahlungModel.

Definition at line 258 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 = 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*(CLHEP::electron_mass_c2+rab0*rab1))*
    (mass + delta*(dnstar*sqrte-2.)));
  fn = std::max(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/(CLHEP::electron_mass_c2*sqrte))*
    (CLHEP::electron_mass_c2+rab0*rab2)));
    fe = std::max(fe, 0.);
  }
 
  dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn*Z + fe)/gammaEnergy;
  dxsection = std::max(dxsection, 0.0);
  return dxsection;
}

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

◆ ComputeMicroscopicCrossSection()

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

protected

Definition at line 220 of file G4MuBremsstrahlungModel.cc.

{
  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 > 8) { kkk = 8; }
  else 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;
}

Referenced by ComputeCrossSectionPerAtom().

◆ ComputMuBremLoss()

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

protected

Definition at line 191 of file G4MuBremsstrahlungModel.cc.

{
  G4double totalEnergy = mass + tkin;
  static const G4double ak1 = 0.05;
  static const G4int k2 = 5;
  G4double loss = 0.;
 
  G4double vcut = cut/totalEnergy;
  G4int kkk = (G4int)(vcut/ak1) + k2;
  if (kkk > 8) { kkk = 8; }
  else if (kkk < 1) { kkk = 1; }
  G4double hhh = vcut/(G4double)(kkk);
 
  G4double aa = 0.;
  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
	)

overridevirtual

Implements G4VEmModel.

Definition at line 129 of file G4MuBremsstrahlungModel.cc.

{
  SetParticle(p);
  if(nullptr == fParticleChange) { 
    fParticleChange = GetParticleChangeForLoss(); 
  }
  if(IsMaster() && p == particle && lowestKinEnergy < HighEnergyLimit()) { 
    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));
        }
      }
    }
    InitialiseElementSelectors(p, cuts); 
  }
}

◆ InitialiseLocal()

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

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 152 of file G4MuBremsstrahlungModel.cc.

{
  if(p == particle && lowestKinEnergy < HighEnergyLimit()) {
    SetElementSelectors(masterModel->GetElementSelectors());
  }
}

◆ MinEnergyCut()

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

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 99 of file G4MuBremsstrahlungModel.cc.

{
  return minThreshold;
}

◆ MinPrimaryEnergy()

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

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 107 of file G4MuBremsstrahlungModel.cc.

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

◆ operator=()

G4MuBremsstrahlungModel & G4MuBremsstrahlungModel::operator= ( const G4MuBremsstrahlungModel & right )

delete

◆ SampleSecondaries()

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

overridevirtual

Implements G4VEmModel.

Definition at line 333 of file G4MuBremsstrahlungModel.cc.

{
  G4double kineticEnergy = dp->GetKineticEnergy();
  // check against insufficient energy
  G4double tmax = std::min(kineticEnergy, maxEnergy);
  G4double tmin = std::min(kineticEnergy, minEnergy);
  tmin = std::max(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 func1 = tmin*
    ComputeDMicroscopicCrossSection(kineticEnergy, Z, tmin);
 
  G4double gEnergy;
  G4double func2;
 
  G4double xmin = G4Log(tmin/minThreshold);
  G4double xmax = G4Log(tmax/tmin);
 
  do {
    gEnergy = minThreshold*G4Exp(xmin + G4UniformRand()*xmax);
    func2 = gEnergy*ComputeDMicroscopicCrossSection(kineticEnergy, Z, gEnergy);
    
    // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
  } while(func2 < func1*G4UniformRand());
 
  // angles of the emitted gamma using general interface
  G4ThreeVector gamDir = 
    GetAngularDistribution()->SampleDirection(dp, gEnergy, Z, 
                                              couple->GetMaterial());
  // create G4DynamicParticle object for the Gamma
  G4DynamicParticle* gamma = new G4DynamicParticle(theGamma, gamDir, gEnergy);
  vdp->push_back(gamma);
 
  // compute post-interaction kinematics of primary e-/e+ based on
  // energy-momentum conservation
  const G4double totMomentum = 
    std::sqrt(kineticEnergy*(kineticEnergy + 2.0*mass));
  G4ThreeVector dir =
    (totMomentum*dp->GetMomentumDirection() - gEnergy*gamDir).unit();
  const G4double finalE = kineticEnergy - gEnergy;
 
  // if secondary gamma energy is higher than threshold(very high by default)
  // then stop tracking the primary particle and create new secondary e-/e+
  // instead of the primary one
  if (gEnergy > SecondaryThreshold()) {
    fParticleChange->ProposeTrackStatus(fStopAndKill);
    fParticleChange->SetProposedKineticEnergy(0.0);
    G4DynamicParticle* newdp = new G4DynamicParticle(particle, dir, finalE);
    vdp->push_back(newdp);
  } else {
    // continue tracking the primary e-/e+ otherwise
    fParticleChange->SetProposedMomentumDirection(dir);
    fParticleChange->SetProposedKineticEnergy(finalE);
  }
}

◆ SetLowestKineticEnergy()

void G4MuBremsstrahlungModel::SetLowestKineticEnergy ( G4double e )

inline

Definition at line 156 of file G4MuBremsstrahlungModel.hh.

{
  lowestKinEnergy = e;
}

◆ SetParticle()

void G4MuBremsstrahlungModel::SetParticle ( const G4ParticleDefinition * p )

protected

Definition at line 116 of file G4MuBremsstrahlungModel.cc.

{
  if(nullptr == 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. ;
  }
}