G4MicroElecLOPhononModel Class Reference

#include <G4MicroElecLOPhononModel.hh>

Inheritance diagram for G4MicroElecLOPhononModel:

Public Member Functions
	G4MicroElecLOPhononModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="G4MicroElecLOPhononModel")
	~G4MicroElecLOPhononModel () override=default
void	Initialise (const G4ParticleDefinition *, const G4DataVector &) override
G4double	CrossSectionPerVolume (const G4Material *material, const G4ParticleDefinition *p, G4double ekin, G4double emin=0.0, G4double emax=DBL_MAX) override
void	SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin=0.0, G4double maxEnergy=DBL_MAX) override
G4MicroElecLOPhononModel &	operator= (const G4MicroElecLOPhononModel &)=delete
	G4MicroElecLOPhononModel (const G4MicroElecLOPhononModel &)=delete
Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)
virtual	~G4VEmModel ()
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	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 G4Material *, const G4ParticleDefinition *, const G4double kinEnergy, const G4double cutEnergy, 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	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	SetDeexcitationFlag (G4bool val)
void	SetForceBuildTable (G4bool val)
void	SetFluctuationFlag (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)
void	SetLPMFlag (G4bool)
void	SetMasterThread (G4bool)
G4VEmModel &	operator= (const G4VEmModel &right)=delete
	G4VEmModel (const G4VEmModel &)=delete

Additional Inherited Members
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 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
std::size_t	currentCoupleIndex = 0
std::size_t	basedCoupleIndex = 0
G4bool	lossFlucFlag = true

Detailed Description

Definition at line 57 of file G4MicroElecLOPhononModel.hh.

Constructor & Destructor Documentation

G4MicroElecLOPhononModel() [1/2]

G4MicroElecLOPhononModel::G4MicroElecLOPhononModel ( const G4ParticleDefinition * p = nullptr, const G4String & nam = "G4MicroElecLOPhononModel" )

explicit

Definition at line 60 of file G4MicroElecLOPhononModel.cc.

  : G4VEmModel(nam),isInitialised(false)
{
  G4cout << "Phonon model is constructed " << G4endl
         << "Phonon Energy = " << phononEnergy / eV << " eV  "<< G4endl;
}

Referenced by G4MicroElecLOPhononModel(), and operator=().

~G4MicroElecLOPhononModel()

G4MicroElecLOPhononModel::~G4MicroElecLOPhononModel ( )

overridedefault

G4MicroElecLOPhononModel() [2/2]

G4MicroElecLOPhononModel::G4MicroElecLOPhononModel ( const G4MicroElecLOPhononModel & )

delete

Member Function Documentation

CrossSectionPerVolume()

G4double G4MicroElecLOPhononModel::CrossSectionPerVolume ( const G4Material * material, const G4ParticleDefinition * p, G4double ekin, G4double emin = 0.0, G4double emax = DBL_MAX )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 79 of file G4MicroElecLOPhononModel.cc.

{
  const G4double e = CLHEP::eplus / CLHEP::coulomb;
  const G4double m0 = CLHEP::electron_mass_c2 / (CLHEP::c_squared*CLHEP::kg);
  const G4double h = CLHEP::hbar_Planck * CLHEP::s/ (CLHEP::m2*CLHEP::kg);
  const G4double eps0 = CLHEP::epsilon0 * CLHEP::m/ (CLHEP::farad);
  const G4double kb = CLHEP::k_Boltzmann * CLHEP::kelvin/ CLHEP::joule;
  const G4double T = 300;
  G4double eps = 9;
  G4double einf = 3;
 
  const G4DataVector cuts;
  Initialise(p, cuts);
 
  if (material->GetName() != "G4_SILICON_DIOXIDE"
   && material->GetName() != "G4_ALUMINUM_OXIDE"
   && material->GetName() != "G4_BORON_NITRIDE")
  {
    return 1 / DBL_MAX;
  }
 
  G4double E =(ekin/eV)*e;
 
  if (material->GetName() == "G4_ALUMINUM_OXIDE")
  {
    eps = 9;
    einf = 3;
    phononEnergy = 0.1*eV;
  }
  if (material->GetName() == "G4_SILICON_DIOXIDE")
  {
    eps = 3.84;
    einf = 2.25;    
    phononEnergy = (0.75*0.153+0.25*0.063 )* eV;
  }
 
  // Nuclear Instruments and Methods in Physics Research Section B:
  // Beam Interactions with Materials and Atoms
  // Volume 454, 1 September 2019, Pages 14 - 22
  // Nuclear Instruments and Methods in Physics Research Section B:
  // Beam Interactions with Materials and Atoms
  // Monte Carlo modeling of low - energy electron - induced secondary
  // electron emission yields in micro - architected boron nitride surfaces
 
  if (material->GetName() == "G4_BORON_NITRIDE")
  {
    eps = 7.1;
    einf = 4.5;
    phononEnergy = 0.17 * eV;
  }
 
  G4double hw = (phononEnergy / eV) * e;
  G4double n = 1.0 / (std::exp(hw / (kb*T)) - 1); //Phonon distribution
  
  if (E<=hw)
  {
    return 1 / DBL_MAX;
  }
 
  if (absor)  // Absorption
  {
    Eprim = E + hw;
    signe = -1;
  }
  else        // Emission
  {
    Eprim = E - hw;
    signe = +1;
  }
 
  G4double racine = std::sqrt(1 + ((-signe*hw) / E));
  G4double P = (std::pow(e, 2) / (4 * pi*eps0*h*h)) * (n + 0.5 + signe*0.5) * ((1 / einf) - (1 / eps)) * std::sqrt(m0 / (2 * E)) *hw* std::log((1 + racine) / (signe * 1 + ((-signe)*racine)));
  G4double MFP = (std::sqrt(2 * E / m0) / P)*m;
 
  if (material->GetName() == "G4_SILICON_DIOXIDE") { return 2 / MFP; }
  return 1/(MFP);                   
}

Initialise()

void G4MicroElecLOPhononModel::Initialise ( const G4ParticleDefinition * , const G4DataVector &  )

overridevirtual

Implements G4VEmModel.

Definition at line 70 of file G4MicroElecLOPhononModel.cc.

{
  fParticleChangeForGamma = GetParticleChangeForGamma();
  isInitialised = true;
}

Referenced by CrossSectionPerVolume().

operator=()

G4MicroElecLOPhononModel & G4MicroElecLOPhononModel::operator= ( const G4MicroElecLOPhononModel & )

delete

SampleSecondaries()

void G4MicroElecLOPhononModel::SampleSecondaries ( std::vector< G4DynamicParticle * > * , const G4MaterialCutsCouple * , const G4DynamicParticle * aDynamicElectron, G4double tmin = 0.0, G4double maxEnergy = DBL_MAX )

overridevirtual

Implements G4VEmModel.

Definition at line 163 of file G4MicroElecLOPhononModel.cc.

{
  G4double E = aDynamicElectron->GetKineticEnergy();
  Eprim = (absor) ? E + phononEnergy : E - phononEnergy;   
 
  G4double rand = G4UniformRand();
  G4double B = (E + Eprim + 2 * std::sqrt(E*Eprim))
             / (E + Eprim - 2 * std::sqrt(E*Eprim));
  G4double cosTheta = ((E + Eprim) / (2 * std::sqrt(E*Eprim)))
                    * (1 - std::pow(B, rand)) + std::pow(B, rand);
  if(Interband)
  {
    cosTheta = 1 - 2 * G4UniformRand(); //Isotrope
  }
  G4double phi = twopi * G4UniformRand();
  G4ThreeVector zVers = aDynamicElectron->GetMomentumDirection();
  G4ThreeVector xVers = zVers.orthogonal();
  G4ThreeVector yVers = zVers.cross(xVers);
  
  G4double xDir = std::sqrt(1. - cosTheta*cosTheta);
  G4double yDir = xDir;
  xDir *= std::cos(phi);
  yDir *= std::sin(phi);
  
  G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers));
  
  fParticleChangeForGamma->ProposeMomentumDirection(zPrimeVers.unit());
  fParticleChangeForGamma->SetProposedKineticEnergy(Eprim);
}

---

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

• G4MicroElecLOPhononModel.hh
• G4MicroElecLOPhononModel.cc