#include <G4BetheBlochModel.hh>

Inheritance diagram for G4BetheBlochModel:

Collaboration diagram for G4BetheBlochModel:

Public Member Functions
	G4BetheBlochModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="BetheBloch")

virtual	~G4BetheBlochModel ()

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

virtual G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple couple) override

virtual G4double	ComputeCrossSectionPerElectron (const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy, G4double maxEnergy)

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

virtual G4double	CrossSectionPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy, G4double maxEnergy) override

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

virtual G4double	GetChargeSquareRatio (const G4ParticleDefinition p, const G4Material mat, G4double kineticEnergy) override

virtual G4double	GetParticleCharge (const G4ParticleDefinition p, const G4Material mat, G4double kineticEnergy) override

virtual void	CorrectionsAlongStep (const G4MaterialCutsCouple couple, const G4DynamicParticle dp, G4double &eloss, G4double &, G4double length) override

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

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

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 void	StartTracking (G4Track *)

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

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

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

virtual void	DefineForRegion (const G4Region *)

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

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

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

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

virtual 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=nullptr)

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	SetFluctuationFlag (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

const G4Isotope *	GetCurrentIsotope () const

G4bool	IsLocked () const

void	SetLocked (G4bool)

Protected Member Functions
virtual G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kinEnergy) override

G4double	GetChargeSquareRatio () const

void	SetChargeSquareRatio (G4double val)

Protected Member Functions inherited from G4VEmModel
G4ParticleChangeForLoss *	GetParticleChangeForLoss ()

G4ParticleChangeForGamma *	GetParticleChangeForGamma ()

const G4MaterialCutsCouple *	CurrentCouple () const

void	SetCurrentElement (const G4Element *)

Additional Inherited Members
Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData

G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

size_t	idxTable

G4bool	lossFlucFlag

Static Protected Attributes inherited from G4VEmModel
static const G4double	inveplus = 1.0/CLHEP::eplus

Detailed Description

Definition at line 72 of file G4BetheBlochModel.hh.

Constructor & Destructor Documentation

G4BetheBlochModel::G4BetheBlochModel	(	const G4ParticleDefinition *	p = `nullptr`,
		const G4String &	nam = `"BetheBloch"`
	)

explicit

Definition at line 75 of file G4BetheBlochModel.cc.

   : G4VEmModel(nam),
     particle(nullptr),
     tlimit(DBL_MAX),
     twoln10(2.0*G4Log(10.0)),
     isIon(false)
 {
   fParticleChange = nullptr;
   theElectron = G4Electron::Electron();
   if(p) {
     SetGenericIon(p);
     SetParticle(p);
   } else {
     SetParticle(theElectron);
   }
   corr = G4LossTableManager::Instance()->EmCorrections();  
   nist = G4NistManager::Instance();
   SetLowEnergyLimit(2.0*MeV);
 }

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G4BetheBlochModel::~G4BetheBlochModel ( )

virtual

Definition at line 98 of file G4BetheBlochModel.cc.

99 {}

Member Function Documentation

G4double G4BetheBlochModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	Z,
		G4double	A,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 216 of file G4BetheBlochModel.cc.

 {
   G4double cross = Z*ComputeCrossSectionPerElectron
                                          (p,kineticEnergy,cutEnergy,maxEnergy);
   return cross;
 }

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G4double G4BetheBlochModel::ComputeCrossSectionPerElectron	(	const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

virtual

Definition at line 185 of file G4BetheBlochModel.cc.

 {
   G4double cross = 0.0;
   G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
   G4double maxEnergy = min(tmax,maxKinEnergy);
   if(cutEnergy < maxEnergy) {
 
     G4double totEnergy = kineticEnergy + mass;
     G4double energy2   = totEnergy*totEnergy;
     G4double beta2     = kineticEnergy*(kineticEnergy + 2.0*mass)/energy2;
 
     cross = (maxEnergy - cutEnergy)/(cutEnergy*maxEnergy) 
       - beta2*G4Log(maxEnergy/cutEnergy)/tmax;
 
     // +term for spin=1/2 particle
     if( 0.0 < spin ) { cross += 0.5*(maxEnergy - cutEnergy)/energy2; }
 
     cross *= twopi_mc2_rcl2*chargeSquare/beta2;
   }
   
    // G4cout << "BB: e= " << kineticEnergy << " tmin= " << cutEnergy 
    //        << " tmax= " << tmax << " cross= " << cross << G4endl;
   
   return cross;
 }

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G4double G4BetheBlochModel::ComputeDEDXPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy
	)

overridevirtual

Reimplemented from G4VEmModel.

Reimplemented in G4BetheBlochNoDeltaModel.

Definition at line 245 of file G4BetheBlochModel.cc.

 {
   G4double tmax      = MaxSecondaryEnergy(p, kineticEnergy);
   G4double cutEnergy = std::min(cut,tmax);
 
   G4double tau   = kineticEnergy/mass;
   G4double gam   = tau + 1.0;
   G4double bg2   = tau * (tau+2.0);
   G4double beta2 = bg2/(gam*gam);
 
   G4double eexc  = material->GetIonisation()->GetMeanExcitationEnergy();
   G4double eexc2 = eexc*eexc;
 
   G4double eDensity = material->GetElectronDensity();
 
   G4double dedx = G4Log(2.0*electron_mass_c2*bg2*cutEnergy/eexc2)
                 - (1.0 + cutEnergy/tmax)*beta2;
 
   if(0.0 < spin) {
     G4double del = 0.5*cutEnergy/(kineticEnergy + mass);
     dedx += del*del;
   }
 
   // density correction
   G4double x = G4Log(bg2)/twoln10;
   dedx -= material->GetIonisation()->DensityCorrection(x);
 
   // shell correction
   dedx -= 2.0*corr->ShellCorrection(p,material,kineticEnergy);
 
   // now compute the total ionization loss
   dedx *= twopi_mc2_rcl2*chargeSquare*eDensity/beta2;
 
   //High order correction different for hadrons and ions
   if(isIon) {
     dedx += corr->IonBarkasCorrection(p,material,kineticEnergy);
   } else {      
     dedx += corr->HighOrderCorrections(p,material,kineticEnergy,cutEnergy);
   }
 
   dedx = std::max(dedx, 0.0); 
 
   //G4cout << "E(MeV)= " << kineticEnergy/MeV << " dedx= " << dedx 
   //         << "  " << material->GetName() << G4endl;
 
   return dedx;
 }

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void G4BetheBlochModel::CorrectionsAlongStep	(	const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	dp,
		G4double &	eloss,
		G4double &	,
		G4double	length
	)

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 298 of file G4BetheBlochModel.cc.

 {
   if(isIon) {
     const G4ParticleDefinition* p = dp->GetDefinition();
     const G4Material* mat = couple->GetMaterial();
     G4double preKinEnergy = dp->GetKineticEnergy();
     G4double e = preKinEnergy - eloss*0.5;
     if(e < preKinEnergy*0.75) { e = preKinEnergy*0.75; }
 
     G4double q2 = corr->EffectiveChargeSquareRatio(p,mat,e);
     GetModelOfFluctuations()->SetParticleAndCharge(p, q2);
     G4double qfactor = q2*corr->EffectiveChargeCorrection(p,mat,e)/corrFactor;
     G4double highOrder = length*corr->IonHighOrderCorrections(p,couple,e);
     G4double elossnew  = eloss*qfactor + highOrder;
     if(elossnew > preKinEnergy)   { elossnew = preKinEnergy; }
     else if(elossnew < eloss*0.5) { elossnew = eloss*0.5; }
     eloss = elossnew;
     //G4cout << "G4BetheBlochModel::CorrectionsAlongStep: e= " << preKinEnergy
     //           << " qfactor= " << qfactor 
     //           << " highOrder= " << highOrder << " (" 
     // << highOrder/eloss << ")" << G4endl;    
   }
 }

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G4double G4BetheBlochModel::CrossSectionPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

overridevirtual

Reimplemented from G4VEmModel.

Reimplemented in G4BetheBlochNoDeltaModel.

Definition at line 230 of file G4BetheBlochModel.cc.

 {
   G4double eDensity = material->GetElectronDensity();
   G4double cross = eDensity*ComputeCrossSectionPerElectron
                                          (p,kineticEnergy,cutEnergy,maxEnergy);
   return cross;
 }

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G4double G4BetheBlochModel::GetChargeSquareRatio	(	const G4ParticleDefinition *	p,
		const G4Material *	mat,
		G4double	kineticEnergy
	)

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 126 of file G4BetheBlochModel.cc.

 {
   // this method is called only for ions
   G4double q2 = corr->EffectiveChargeSquareRatio(p,mat,kineticEnergy);
   corrFactor = q2*corr->EffectiveChargeCorrection(p,mat,kineticEnergy);
   return corrFactor;
 }

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G4double G4BetheBlochModel::GetChargeSquareRatio ( ) const

inlineprotected

Definition at line 194 of file G4BetheBlochModel.hh.

 {
   return chargeSquare;
 }

G4double G4BetheBlochModel::GetParticleCharge	(	const G4ParticleDefinition *	p,
		const G4Material *	mat,
		G4double	kineticEnergy
	)

overridevirtual

Reimplemented from G4VEmModel.

Reimplemented in G4BetheBlochIonGasModel.

Definition at line 138 of file G4BetheBlochModel.cc.

 {
   //G4cout<<"G4BetheBlochModel::GetParticleCharge e= "<<kineticEnergy <<
   //  " q= " <<  corr->GetParticleCharge(p,mat,kineticEnergy) <<G4endl;
   // this method is called only for ions, so no check if it is an ion
   return corr->GetParticleCharge(p,mat,kineticEnergy);
 }

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void G4BetheBlochModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &
	)

overridevirtual

Implements G4VEmModel.

Definition at line 103 of file G4BetheBlochModel.cc.

 {
   SetGenericIon(p);
   SetParticle(p);
 
   //G4cout << "G4BetheBlochModel::Initialise for " << p->GetParticleName()
   //         << "  isIon= " << isIon 
   //         << G4endl;
 
   // always false before the run
   SetDeexcitationFlag(false);
 
   if(nullptr == fParticleChange) {
     fParticleChange = GetParticleChangeForLoss();
     if(UseAngularGeneratorFlag() && !GetAngularDistribution()) {
       SetAngularDistribution(new G4DeltaAngle());
     }
   }
 }

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G4double G4BetheBlochModel::MaxSecondaryEnergy	(	const G4ParticleDefinition *	pd,
		G4double	kinEnergy
	)

overrideprotectedvirtual

Reimplemented from G4VEmModel.

Definition at line 444 of file G4BetheBlochModel.cc.

 {
   // here particle type is checked for any method
   SetParticle(pd);
   G4double tau  = kinEnergy/mass;
   G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.) /
                   (1. + 2.0*(tau + 1.)*ratio + ratio*ratio);
   return std::min(tmax,tlimit);
 }

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G4double G4BetheBlochModel::MinEnergyCut	(	const G4ParticleDefinition *	,
		const G4MaterialCutsCouple *	couple
	)

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 176 of file G4BetheBlochModel.cc.

 {
   return couple->GetMaterial()->GetIonisation()->GetMeanExcitationEnergy();
 }

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void G4BetheBlochModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vdp,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	dp,
		G4double	tmin,
		G4double	maxEnergy
	)

overridevirtual

Implements G4VEmModel.

Definition at line 328 of file G4BetheBlochModel.cc.

 {
   G4double kineticEnergy = dp->GetKineticEnergy();
   G4double tmax = MaxSecondaryEnergy(dp->GetDefinition(),kineticEnergy);
 
   G4double maxKinEnergy = std::min(maxEnergy,tmax);
   if(minKinEnergy >= maxKinEnergy) { return; }
 
   //G4cout << "G4BetheBlochModel::SampleSecondaries Emin= " << minKinEnergy
   //         << " Emax= " << maxKinEnergy << G4endl;
 
   G4double totEnergy     = kineticEnergy + mass;
   G4double etot2         = totEnergy*totEnergy;
   G4double beta2         = kineticEnergy*(kineticEnergy + 2.0*mass)/etot2;
 
   G4double deltaKinEnergy, f; 
   G4double f1 = 0.0;
   G4double fmax = 1.0;
   if( 0.0 < spin ) { fmax += 0.5*maxKinEnergy*maxKinEnergy/etot2; }
 
   CLHEP::HepRandomEngine* rndmEngineMod = G4Random::getTheEngine();
   G4double rndm[2];
 
   // sampling without nuclear size effect
   do {
     rndmEngineMod->flatArray(2, rndm);
     deltaKinEnergy = minKinEnergy*maxKinEnergy
                     /(minKinEnergy*(1.0 - rndm[0]) + maxKinEnergy*rndm[0]);
 
     f = 1.0 - beta2*deltaKinEnergy/tmax;
     if( 0.0 < spin ) {
       f1 = 0.5*deltaKinEnergy*deltaKinEnergy/etot2;
       f += f1;
     }
 
     // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
   } while( fmax*rndm[1] > f);
 
   // projectile formfactor - suppresion of high energy
   // delta-electron production at high energy
   
   G4double x = formfact*deltaKinEnergy;
   if(x > 1.e-6) {
 
     G4double x1 = 1.0 + x;
     G4double grej  = 1.0/(x1*x1);
     if( 0.0 < spin ) {
       G4double x2 = 0.5*electron_mass_c2*deltaKinEnergy/(mass*mass);
       grej *= (1.0 + magMoment2*(x2 - f1/f)/(1.0 + x2));
     }
     if(grej > 1.1) {
       G4cout << "### G4BetheBlochModel WARNING: grej= " << grej
              << "  " << dp->GetDefinition()->GetParticleName()
              << " Ekin(MeV)= " <<  kineticEnergy
              << " delEkin(MeV)= " << deltaKinEnergy
              << G4endl;
     }
     if(rndmEngineMod->flat() > grej) { return; }
   }
 
   G4ThreeVector deltaDirection;
 
   if(UseAngularGeneratorFlag()) {
 
     const G4Material* mat =  couple->GetMaterial();
     G4int Z = SelectRandomAtomNumber(mat);
 
     deltaDirection = 
       GetAngularDistribution()->SampleDirection(dp, deltaKinEnergy, Z, mat);
 
   } else {
  
     G4double deltaMomentum =
       sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
     G4double cost = deltaKinEnergy * (totEnergy + electron_mass_c2) /
       (deltaMomentum * dp->GetTotalMomentum());
     if(cost > 1.0) { cost = 1.0; }
     G4double sint = sqrt((1.0 - cost)*(1.0 + cost));
 
     G4double phi = twopi*rndmEngineMod->flat();
 
     deltaDirection.set(sint*cos(phi),sint*sin(phi), cost) ;
     deltaDirection.rotateUz(dp->GetMomentumDirection());
   }  
   /*
     G4cout << "### G4BetheBlochModel " 
            << dp->GetDefinition()->GetParticleName()
            << " Ekin(MeV)= " <<  kineticEnergy
            << " delEkin(MeV)= " << deltaKinEnergy
            << " tmin(MeV)= " << minKinEnergy
            << " tmax(MeV)= " << maxKinEnergy
            << " dir= " << dp->GetMomentumDirection()
            << " dirDelta= " << deltaDirection
            << G4endl;
   */
   // create G4DynamicParticle object for delta ray
   G4DynamicParticle* delta = 
     new G4DynamicParticle(theElectron,deltaDirection,deltaKinEnergy);
 
   vdp->push_back(delta);
 
   // Change kinematics of primary particle
   kineticEnergy -= deltaKinEnergy;
   G4ThreeVector finalP = dp->GetMomentum() - delta->GetMomentum();
   finalP               = finalP.unit();
   
   fParticleChange->SetProposedKineticEnergy(kineticEnergy);
   fParticleChange->SetProposedMomentumDirection(finalP);
 }

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void G4BetheBlochModel::SetChargeSquareRatio ( G4double val )

inlineprotected

Definition at line 201 of file G4BetheBlochModel.hh.

 {
   chargeSquare = val;
 }

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

source/geant4.10.03.p03/source/processes/electromagnetic/standard/include/G4BetheBlochModel.hh
source/geant4.10.03.p03/source/processes/electromagnetic/standard/src/G4BetheBlochModel.cc

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation