#include <G4WentzelVIRelModel.hh>

Inheritance diagram for G4WentzelVIRelModel:

Collaboration diagram for G4WentzelVIRelModel:

Public Member Functions
	G4WentzelVIRelModel (G4bool combined=true)

virtual	~G4WentzelVIRelModel ()

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

virtual void	StartTracking (G4Track *) override

virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double KineticEnergy, G4double AtomicNumber, G4double AtomicWeight=0., G4double cut=DBL_MAX, G4double emax=DBL_MAX) override

virtual G4ThreeVector &	SampleScattering (const G4ThreeVector &, G4double safety) override

virtual G4double	ComputeTruePathLengthLimit (const G4Track &track, G4double &currentMinimalStep) override

virtual G4double	ComputeGeomPathLength (G4double truePathLength) override

virtual G4double	ComputeTrueStepLength (G4double geomStepLength) override

Public Member Functions inherited from G4VMscModel
	G4VMscModel (const G4String &nam)

virtual	~G4VMscModel ()

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

void	SetStepLimitType (G4MscStepLimitType)

void	SetLateralDisplasmentFlag (G4bool val)

void	SetRangeFactor (G4double)

void	SetGeomFactor (G4double)

void	SetSkin (G4double)

void	SetSampleZ (G4bool)

G4VEnergyLossProcess *	GetIonisation () const

void	SetIonisation (G4VEnergyLossProcess , const G4ParticleDefinition part)

G4double	ComputeSafety (const G4ThreeVector &position, G4double limit=DBL_MAX)

G4double	ComputeGeomLimit (const G4Track &, G4double &presafety, G4double limit)

G4double	GetDEDX (const G4ParticleDefinition part, G4double kineticEnergy, const G4MaterialCutsCouple couple)

G4double	GetRange (const G4ParticleDefinition part, G4double kineticEnergy, const G4MaterialCutsCouple couple)

G4double	GetEnergy (const G4ParticleDefinition part, G4double range, const G4MaterialCutsCouple couple)

G4double	GetTransportMeanFreePath (const G4ParticleDefinition *part, G4double kinEnergy)

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	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	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	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 , 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	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	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)

Additional Inherited Members
Protected Member Functions inherited from G4VMscModel
G4ParticleChangeForMSC *	GetParticleChangeForMSC (const G4ParticleDefinition *p=nullptr)

G4double	ConvertTrueToGeom (G4double &tLength, G4double &gLength)

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 G4VMscModel
G4double	facrange

G4double	facgeom

G4double	facsafety

G4double	skin

G4double	dtrl

G4double	lambdalimit

G4double	geomMin

G4double	geomMax

G4ThreeVector	fDisplacement

G4MscStepLimitType	steppingAlgorithm

G4bool	samplez

G4bool	latDisplasment

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData

G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

size_t	idxTable

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

Detailed Description

Definition at line 69 of file G4WentzelVIRelModel.hh.

Constructor & Destructor Documentation

G4WentzelVIRelModel::G4WentzelVIRelModel ( G4bool combined = true )

explicit

Definition at line 73 of file G4WentzelVIRelModel.cc.

                                                         :
   G4VMscModel("WentzelVIRel"),
   numlimit(0.1),
   currentCouple(nullptr),
   cosThetaMin(1.0),
   isCombined(combined),
   inside(false),
   singleScatteringMode(false)
 {
   invsqrt12 = 1./sqrt(12.);
   tlimitminfix = 1.e-6*mm;
   lowEnergyLimit = 1.0*eV;
   particle = 0;
   nelments = 5;
   xsecn.resize(nelments);
   prob.resize(nelments);
   theManager = G4LossTableManager::Instance();
   fNistManager = G4NistManager::Instance();
   fG4pow = G4Pow::GetInstance();
   wokvi = new G4WentzelVIRelXSection(combined);
 
   preKinEnergy = tPathLength = zPathLength = lambdaeff = currentRange = 
     xtsec = 0;
   currentMaterialIndex = 0;
   cosThetaMax = cosTetMaxNuc = 1.0;
 
   fParticleChange = nullptr;
   currentCuts = nullptr;
   currentMaterial = nullptr;
 }

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G4WentzelVIRelModel::~G4WentzelVIRelModel ( )

virtual

Definition at line 106 of file G4WentzelVIRelModel.cc.

 {
   delete wokvi;
 }

Member Function Documentation

G4double G4WentzelVIRelModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	p,
		G4double	KineticEnergy,
		G4double	AtomicNumber,
		G4double	AtomicWeight = `0.`,
		G4double	cut = `DBL_MAX`,
		G4double	emax = `DBL_MAX`
	)

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 140 of file G4WentzelVIRelModel.cc.

 {
   G4double cross = 0.0;
   if(p != particle) { SetupParticle(p); }
   if(kinEnergy < lowEnergyLimit) { return cross; }
   if(!CurrentCouple()) {
     G4Exception("G4WentzelVIRelModel::ComputeCrossSectionPerAtom", "em0011",
                 FatalException, " G4MaterialCutsCouple is not defined");
     return cross;
   }
   DefineMaterial(CurrentCouple());
   G4int iz = G4lrint(Z);
   G4double tmass = proton_mass_c2;
   if(1 < iz) {
     tmass = fNistManager->GetAtomicMassAmu(iz)*amu_c2;
   }
   cosTetMaxNuc = wokvi->SetupKinematic(kinEnergy, currentMaterial, 
                        cutEnergy, tmass);
   if(cosTetMaxNuc < 1.0) {
     G4double cost = wokvi->SetupTarget(iz, cutEnergy);
     cross = wokvi->ComputeTransportCrossSectionPerAtom(cost);
     /*
     if(p->GetParticleName() == "e-")      
     G4cout << "G4WentzelVIRelModel::CS: Z= " << G4int(Z) 
            << " e(MeV)= " << kinEnergy 
            << " 1-cosN= " << 1 - cosTetMaxNuc << " cross(bn)= " << cross/barn
            << " " << particle->GetParticleName() << G4endl;
     */
   }
   return cross;
 }

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G4double G4WentzelVIRelModel::ComputeGeomPathLength ( G4double truePathLength )

overridevirtual

Reimplemented from G4VMscModel.

Definition at line 287 of file G4WentzelVIRelModel.cc.

 {
   tPathLength  = truelength;
   zPathLength  = tPathLength;
 
   if(lambdaeff > 0.0 && lambdaeff != DBL_MAX) {
     G4double tau = tPathLength/lambdaeff;
     //G4cout << "ComputeGeomPathLength: tLength= " << tPathLength
     //         << " Leff= " << lambdaeff << " tau= " << tau << G4endl; 
     // small step
     if(tau < numlimit) {
       zPathLength *= (1.0 - 0.5*tau + tau*tau/6.0);
 
       // medium step
     } else {
       G4double e1 = 0.0;
       if(currentRange > tPathLength) {
         e1 = GetEnergy(particle,currentRange-tPathLength,currentCouple);
       }
       e1 = 0.5*(e1 + preKinEnergy);
       cosTetMaxNuc = wokvi->SetupKinematic(e1, currentMaterial, 0.0, 
                        proton_mass_c2);
       lambdaeff = GetTransportMeanFreePath(particle,e1);
       zPathLength = lambdaeff*(1.0 - G4Exp(-tPathLength/lambdaeff));
     }
   } else { lambdaeff = DBL_MAX; }
   //G4cout<<"Comp.geom: zLength= "<<zPathLength
   // <<" tLength= "<<tPathLength<<G4endl;
   return zPathLength;
 }

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G4double G4WentzelVIRelModel::ComputeTruePathLengthLimit	(	const G4Track &	track,
		G4double &	currentMinimalStep
	)

overridevirtual

Reimplemented from G4VMscModel.

Definition at line 187 of file G4WentzelVIRelModel.cc.

 {
   G4double tlimit = currentMinimalStep;
   const G4DynamicParticle* dp = track.GetDynamicParticle();
   G4StepPoint* sp = track.GetStep()->GetPreStepPoint();
   G4StepStatus stepStatus = sp->GetStepStatus();
   singleScatteringMode = false;
   //G4cout << "G4WentzelVIRelModel::ComputeTruePathLengthLimit stepStatus= " 
   //         << stepStatus << G4endl;
 
 
   // initialisation for each step, lambda may be computed from scratch
   preKinEnergy  = dp->GetKineticEnergy();
   DefineMaterial(track.GetMaterialCutsCouple());
   lambdaeff = GetTransportMeanFreePath(particle,preKinEnergy);
   currentRange = GetRange(particle,preKinEnergy,currentCouple);
 
   G4double rcut = currentCouple->GetProductionCuts()->GetProductionCut(1);
   cosTetMaxNuc = wokvi->SetupKinematic(preKinEnergy, currentMaterial,
                                        rcut, proton_mass_c2);
 
   // extra check for abnormal situation
   // this check needed to run MSC with eIoni and eBrem inactivated
   if(tlimit > currentRange) { tlimit = currentRange; }
 
   // stop here if small range particle
   if(inside || tlimit < tlimitminfix) { 
     return ConvertTrueToGeom(tlimit, currentMinimalStep); 
   }
 
   // pre step
   G4double presafety = sp->GetSafety();
   // far from geometry boundary
   if(currentRange < presafety) {
     inside = true;  
     return ConvertTrueToGeom(tlimit, currentMinimalStep);
   }
 
   // compute presafety again if presafety <= 0 and no boundary
   // i.e. when it is needed for optimization purposes
   if(stepStatus != fGeomBoundary && presafety < tlimitminfix) {
     presafety = ComputeSafety(sp->GetPosition(), tlimit); 
     if(currentRange < presafety) {
       inside = true;  
       return ConvertTrueToGeom(tlimit, currentMinimalStep);
     }
   }
   /*  
   G4cout << "e(MeV)= " << preKinEnergy/MeV
          << "  " << particle->GetParticleName() 
          << " CurLimit(mm)= " << tlimit/mm <<" safety(mm)= " << presafety/mm
          << " R(mm)= " <<currentRange/mm
          << " L0(mm^-1)= " << lambdaeff*mm 
          <<G4endl;
   */
 
   // natural limit for high energy
   G4double rlimit = std::max(facrange*currentRange, 
                              0.7*(1.0 - cosTetMaxNuc)*lambdaeff);
 
   // low-energy e-
   if(cosThetaMax > cosTetMaxNuc) {
     rlimit = std::min(rlimit, facsafety*presafety);
   }
    
   // cut correction
   //G4cout << "rcut= " << rcut << " rlimit= " << rlimit 
   //   << " presafety= " << presafety 
   // << " 1-cosThetaMax= " <<1-cosThetaMax 
   // << " 1-cosTetMaxNuc= " << 1-cosTetMaxNuc
   // << G4endl;
   if(rcut > rlimit) { rlimit = std::min(rlimit, rcut*sqrt(rlimit/rcut)); }
 
   if(rlimit < tlimit) { tlimit = rlimit; }
 
   tlimit = std::max(tlimit, tlimitminfix);
 
   // step limit in infinite media
   tlimit = std::min(tlimit, 50*currentMaterial->GetRadlen()/facgeom);
 
   //compute geomlimit and force few steps within a volume
   if(steppingAlgorithm == fUseDistanceToBoundary && stepStatus == fGeomBoundary)
     {
       G4double geomlimit = ComputeGeomLimit(track, presafety, currentRange);
       tlimit = std::min(tlimit, geomlimit/facgeom);
     } 
 
   /*  
   G4cout << particle->GetParticleName() << " e= " << preKinEnergy
          << " L0= " << lambdaeff << " R= " << currentRange
          << "tlimit= " << tlimit  
            << " currentMinimalStep= " << currentMinimalStep << G4endl;
   */
   return ConvertTrueToGeom(tlimit, currentMinimalStep);
 }

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G4double G4WentzelVIRelModel::ComputeTrueStepLength ( G4double geomStepLength )

overridevirtual

Reimplemented from G4VMscModel.

Definition at line 320 of file G4WentzelVIRelModel.cc.

 {
   // initialisation of single scattering x-section
   xtsec = 0.0;
   cosThetaMin = cosTetMaxNuc;
 
   //G4cout << "Step= " << geomStepLength << "  Lambda= " <<  lambdaeff 
   //         << " 1-cosThetaMaxNuc= " << 1 - cosTetMaxNuc << G4endl;
   // pathalogical case
   if(lambdaeff == DBL_MAX) { 
     singleScatteringMode = true;
     zPathLength  = geomStepLength;
     tPathLength  = geomStepLength;
     cosThetaMin = 1.0;
 
     // normal case
   } else {
 
     // small step use only single scattering
     static const G4double singleScatLimit = 1.0e-7;
     if(geomStepLength < lambdaeff*singleScatLimit*(1.0 - cosTetMaxNuc)) {
       singleScatteringMode = true;
       cosThetaMin = 1.0;
       zPathLength  = geomStepLength;
       tPathLength  = geomStepLength;
 
       // step defined by transportation 
     } else if(geomStepLength != zPathLength) { 
 
       // step defined by transportation 
       zPathLength  = geomStepLength;
       G4double tau = geomStepLength/lambdaeff;
       tPathLength  = zPathLength*(1.0 + 0.5*tau + tau*tau/3.0); 
 
       // energy correction for a big step
       if(tau > numlimit) {
         G4double e1 = 0.0;
         if(currentRange > tPathLength) {
           e1 = GetEnergy(particle,currentRange-tPathLength,currentCouple);
         }
         e1 = 0.5*(e1 + preKinEnergy);
         cosTetMaxNuc = wokvi->SetupKinematic(e1, currentMaterial, 0.0, 
                          proton_mass_c2);
         lambdaeff = GetTransportMeanFreePath(particle,e1);
         tau = zPathLength/lambdaeff;
       
         if(tau < 0.999999) { tPathLength = -lambdaeff*G4Log(1.0 - tau); } 
         else               { tPathLength = currentRange; }
       }
     }
   }
 
   // check of step length
   // define threshold angle between single and multiple scattering 
   if(!singleScatteringMode) { cosThetaMin = 1.0 - 1.5*tPathLength/lambdaeff; }
 
   // recompute transport cross section - do not change energy
   // anymore - cannot be applied for big steps
   if(cosThetaMin > cosTetMaxNuc) {
 
     // new computation
     G4double cross = ComputeXSectionPerVolume();
     //G4cout << "%%%% cross= " << cross << "  xtsec= " << xtsec << G4endl;
     if(cross <= 0.0) {
       singleScatteringMode = true;
       tPathLength = zPathLength; 
       lambdaeff = DBL_MAX;
     } else if(xtsec > 0.0) {
 
       lambdaeff = 1./cross; 
       G4double tau = zPathLength*cross;
       if(tau < numlimit) { 
         tPathLength = zPathLength*(1.0 + 0.5*tau + tau*tau/3.0); 
       } 
       else if(tau < 0.999999) { tPathLength = -lambdaeff*G4Log(1.0 - tau); } 
       else                    { tPathLength = currentRange; }
 
       if(tPathLength > currentRange) { tPathLength = currentRange; }
     } 
   }
 
   /*      
   G4cout <<"Comp.true: zLength= "<<zPathLength<<" tLength= "<<tPathLength
          <<" Leff(mm)= "<<lambdaeff/mm<<" sig0(1/mm)= " << xtsec <<G4endl;
   G4cout << particle->GetParticleName() << " 1-cosThetaMin= " << 1-cosThetaMin
          << " 1-cosTetMaxNuc= " << 1-cosTetMaxNuc 
          << " e(MeV)= " << preKinEnergy/MeV << "  "  << singleScatteringMode 
          << G4endl;
   */
   return tPathLength;
 }

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void G4WentzelVIRelModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &	cuts
	)

overridevirtual

Implements G4VEmModel.

Definition at line 113 of file G4WentzelVIRelModel.cc.

 {
   // reset parameters
   SetupParticle(p);
   currentRange = 0.0;
 
   if(isCombined) {
     G4double tet = PolarAngleLimit();
     if(tet >= pi)      { cosThetaMax = -1.0; }
     else if(tet > 0.0) { cosThetaMax = cos(tet); }
   }
 
   wokvi->Initialise(p, cosThetaMax);
   /*  
   G4cout << "G4WentzelVIRelModel: " << particle->GetParticleName()
          << "  1-cos(ThetaLimit)= " << 1 - cosThetaMax 
          << G4endl;
   */
   currentCuts = &cuts;
 
   // set values of some data members
   fParticleChange = GetParticleChangeForMSC(p);
 }

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G4ThreeVector & G4WentzelVIRelModel::SampleScattering	(	const G4ThreeVector &	oldDirection,
		G4double	safety
	)

overridevirtual

Reimplemented from G4VMscModel.

Definition at line 415 of file G4WentzelVIRelModel.cc.

 {
   fDisplacement.set(0.0,0.0,0.0);
   //G4cout << "!##! G4WentzelVIRelModel::SampleScattering for " 
   //         << particle->GetParticleName() << G4endl;
 
   // ignore scattering for zero step length and energy below the limit
   if(preKinEnergy < lowEnergyLimit || tPathLength <= 0.0) 
     { return fDisplacement; }
   
   G4double invlambda = 0.0;
   if(lambdaeff < DBL_MAX) { invlambda = 0.5/lambdaeff; }
 
   // use average kinetic energy over the step
   G4double cut = (*currentCuts)[currentMaterialIndex];
   /*
   G4cout <<"SampleScat: E0(MeV)= "<< preKinEnergy/MeV
            << " Leff= " << lambdaeff <<" sig0(1/mm)= " << xtsec 
           << " xmsc= " <<  tPathLength*invlambda 
          << " safety= " << safety << G4endl;
   */
 
   // step limit due msc
   G4double x0 = tPathLength;
   //  const G4double thinlimit = 0.5; 
   static const G4double thinlimit = 0.1; 
   G4int nMscSteps = 1;
   // large scattering angle case - two step approach
   if(tPathLength*invlambda > thinlimit && safety > tlimitminfix) { 
     x0 *= 0.5; 
     nMscSteps = 2; 
   } 
 
   // step limit due to single scattering
   G4double x1 = 2*tPathLength;
   if(0.0 < xtsec) { x1 = -G4Log(G4UniformRand())/xtsec; }
 
   const G4ElementVector* theElementVector = 
     currentMaterial->GetElementVector();
   G4int nelm = currentMaterial->GetNumberOfElements();
 
   // geometry
   G4double sint, cost, phi;
   G4ThreeVector temp(0.0,0.0,1.0);
 
   // current position and direction relative to the end point
   // because of magnetic field geometry is computed relatively to the 
   // end point of the step 
   G4ThreeVector dir(0.0,0.0,1.0);
   fDisplacement.set(0.0,0.0,-zPathLength);
   G4double mscfac = zPathLength/tPathLength;
 
   // start a loop 
   G4double x2 = x0;
   G4double step, z;
   G4bool singleScat;
   /*
     G4cout << "Start of the loop x1(mm)= " << x1 << "  x2(mm)= " << x2 
            << " 1-cost1= " << 1 - cosThetaMin << "  " << singleScatteringMode 
            << " xtsec= " << xtsec << G4endl;
   */
   do {
 
     // single scattering case
     if(x1 < x2) { 
       step = x1;
       singleScat = true;
     } else {
       step = x2;
       singleScat = false;
     }
 
     // new position
     fDisplacement += step*mscfac*dir;
 
     if(singleScat) {
 
       // select element
       G4int i = 0;
       if(nelm > 1) {
         G4double qsec = G4UniformRand()*xtsec;
         for (; i<nelm; ++i) { if(xsecn[i] >= qsec) { break; } }
       }
       G4double cosTetM = 
         wokvi->SetupTarget(G4lrint((*theElementVector)[i]->GetZ()), cut);
       //G4cout << "!!! " << cosThetaMin << "  " << cosTetM 
       // << "  " << prob[i] << G4endl;
       temp = wokvi->SampleSingleScattering(cosThetaMin, cosTetM, prob[i]);
 
       // direction is changed
       temp.rotateUz(dir);
       dir = temp;
 
       // new proposed step length
       x1  = -G4Log(G4UniformRand())/xtsec; 
       x2 -= step; 
       if(x2 <= 0.0) { --nMscSteps; }
 
     // multiple scattering
     } else { 
       --nMscSteps;
       x1 -= step;
       x2  = x0;
 
       // for multiple scattering x0 should be used as a step size
       if(!singleScatteringMode) {
         G4double z0 = x0*invlambda;
 
         // correction to keep first moment
  
         // sample z in interval 0 - 1
         if(z0 > 5.0) { z = G4UniformRand(); }
         else {
           G4double zzz = 0.0;
           if(z0 > 0.01) { zzz = G4Exp(-1.0/z0); }
           z = -z0*G4Log(1.0 - (1.0 - zzz)*G4UniformRand());
           //  /(1.0 - (1.0/z0 + 1.0)*zzz); 
         }
 
         cost = 1.0 - 2.0*z/*factCM*/;
         if(cost > 1.0)       { cost = 1.0; }
         else if(cost < -1.0) { cost =-1.0; }
         sint = sqrt((1.0 - cost)*(1.0 + cost));
         phi  = twopi*G4UniformRand();
         G4double vx1 = sint*cos(phi);
         G4double vy1 = sint*sin(phi);
 
         // lateral displacement  
         if (latDisplasment && x0 > tlimitminfix) {
           G4double rms = invsqrt12*sqrt(2*z0);
           G4double r   = x0*mscfac;
           G4double dx  = r*(0.5*vx1 + rms*G4RandGauss::shoot(0.0,1.0));
           G4double dy  = r*(0.5*vy1 + rms*G4RandGauss::shoot(0.0,1.0));
           G4double dz;
           G4double d   = r*r - dx*dx - dy*dy;
           if(d >= 0.0)  { dz = sqrt(d) - r; }
           else          { dx = dy = dz = 0.0; }
 
           // change position
           temp.set(dx,dy,dz);
           temp.rotateUz(dir); 
           fDisplacement += temp;
         }
         // change direction
         temp.set(vx1,vy1,cost);
         temp.rotateUz(dir);
         dir = temp;
       }
     }
     // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
   } while (0 < nMscSteps);
     
   dir.rotateUz(oldDirection);
 
   //G4cout << "G4WentzelVIRelModel sampling of scattering is done" << G4endl;
   // end of sampling -------------------------------
 
   fParticleChange->ProposeMomentumDirection(dir);
 
   // lateral displacement  
   fDisplacement.rotateUz(oldDirection);
 
   /*            
          G4cout << " r(mm)= " << fDisplacement.mag() 
                 << " safety= " << safety
                 << " trueStep(mm)= " << tPathLength
                 << " geomStep(mm)= " << zPathLength
                 << " x= " << fDisplacement.x() 
                 << " y= " << fDisplacement.y() 
                 << " z= " << fDisplacement.z()
                 << G4endl;
   */
 
   //G4cout<< "G4WentzelVIRelModel::SampleScattering end NewDir= " 
   // << dir<< G4endl;
   return fDisplacement;
 }

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void G4WentzelVIRelModel::StartTracking ( G4Track * track )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 178 of file G4WentzelVIRelModel.cc.

 {
   SetupParticle(track->GetDynamicParticle()->GetDefinition());
   inside = false;
   G4VEmModel::StartTracking(track);
 }

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

geant4.10.03.p01/source/processes/electromagnetic/standard/include/G4WentzelVIRelModel.hh
geant4.10.03.p01/source/processes/electromagnetic/standard/src/G4WentzelVIRelModel.cc

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