G4WentzelVIRelModel Class Reference

#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 &)
void	StartTracking (G4Track *)
virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double KineticEnergy, G4double AtomicNumber, G4double AtomicWeight=0., G4double cut=DBL_MAX, G4double emax=DBL_MAX)
virtual G4ThreeVector &	SampleScattering (const G4ThreeVector &, G4double safety)
virtual G4double	ComputeTruePathLengthLimit (const G4Track &track, G4double &currentMinimalStep)
virtual G4double	ComputeGeomPathLength (G4double truePathLength)
virtual G4double	ComputeTrueStepLength (G4double geomStepLength)
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)
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, const G4ParticleDefinition *, G4double)
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 *> *)
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=0)
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)

Private Member Functions
G4double	ComputeXSectionPerVolume ()
void	SetupParticle (const G4ParticleDefinition *)
void	DefineMaterial (const G4MaterialCutsCouple *)
G4WentzelVIRelModel &	operator= (const G4WentzelVIRelModel &right)
	G4WentzelVIRelModel (const G4WentzelVIRelModel &)

Private Attributes
G4LossTableManager *	theManager
G4NistManager *	fNistManager
G4ParticleChangeForMSC *	fParticleChange
G4WentzelVIRelXSection *	wokvi
G4Pow *	fG4pow
const G4DataVector *	currentCuts
G4double	tlimitminfix
G4double	invsqrt12
G4double	preKinEnergy
G4double	tPathLength
G4double	zPathLength
G4double	lambdaeff
G4double	currentRange
G4double	xtsec
std::vector< G4double >	xsecn
std::vector< G4double >	prob
G4int	nelments
G4double	numlimit
G4int	currentMaterialIndex
const G4MaterialCutsCouple *	currentCouple
const G4Material *	currentMaterial
G4double	cosThetaMin
G4double	cosThetaMax
G4double	cosTetMaxNuc
const G4ParticleDefinition *	particle
G4double	lowEnergyLimit
G4bool	isCombined
G4bool	inside
G4bool	singleScatteringMode

Additional Inherited Members
Protected Member Functions inherited from G4VMscModel
G4ParticleChangeForMSC *	GetParticleChangeForMSC (const G4ParticleDefinition *p=0)
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() [1/2]

G4WentzelVIRelModel::G4WentzelVIRelModel

(

G4bool

combined = true

)

Definition at line 73 of file G4WentzelVIRelModel.cc.

                                                        :
  G4VMscModel("WentzelVIRel"),
  numlimit(0.1),
  currentCouple(0),
  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 = 0;
  currentCuts = 0;
  currentMaterial = 0;
}

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~G4WentzelVIRelModel()

G4WentzelVIRelModel::~G4WentzelVIRelModel ( )

virtual

Definition at line 106 of file G4WentzelVIRelModel.cc.

{
  delete wokvi;
}

G4WentzelVIRelModel() [2/2]

G4WentzelVIRelModel::G4WentzelVIRelModel ( const G4WentzelVIRelModel &  )

private

Member Function Documentation

ComputeCrossSectionPerAtom()

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

virtual

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 0.0;
  }
  DefineMaterial(CurrentCouple());
  G4int iz = G4int(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(G4lrint(Z), 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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ComputeGeomPathLength()

G4double G4WentzelVIRelModel::ComputeGeomPathLength ( G4double  truePathLength )

virtual

Reimplemented from G4VMscModel.

Definition at line 286 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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ComputeTruePathLengthLimit()

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

virtual

Reimplemented from G4VMscModel.

Definition at line 186 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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ComputeTrueStepLength()

G4double G4WentzelVIRelModel::ComputeTrueStepLength ( G4double  geomStepLength )

virtual

Reimplemented from G4VMscModel.

Definition at line 318 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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ComputeXSectionPerVolume()

G4double G4WentzelVIRelModel::ComputeXSectionPerVolume ( )

private

Definition at line 593 of file G4WentzelVIRelModel.cc.

{
  // prepare recomputation of x-sections
  const G4ElementVector* theElementVector = currentMaterial->GetElementVector();
  const G4double* theAtomNumDensityVector = 
    currentMaterial->GetVecNbOfAtomsPerVolume();
  G4int nelm = currentMaterial->GetNumberOfElements();
  if(nelm > nelments) {
    nelments = nelm;
    xsecn.resize(nelm);
    prob.resize(nelm);
  }
  G4double cut = (*currentCuts)[currentMaterialIndex];
  //  cosTetMaxNuc = wokvi->GetCosThetaNuc();

  // check consistency
  xtsec = 0.0;
  if(cosTetMaxNuc > cosThetaMin) { return 0.0; }

  // loop over elements
  G4double xs = 0.0;
  for (G4int i=0; i<nelm; ++i) {
    G4double costm = 
      wokvi->SetupTarget(G4lrint((*theElementVector)[i]->GetZ()), cut);
    G4double density = theAtomNumDensityVector[i];

    G4double esec = 0.0;
    if(costm < cosThetaMin) {  

      // recompute the transport x-section
      if(1.0 > cosThetaMin) {
        xs += density*wokvi->ComputeTransportCrossSectionPerAtom(cosThetaMin);
      }
      // recompute the total x-section
      G4double nucsec = wokvi->ComputeNuclearCrossSection(cosThetaMin, costm);
      esec = wokvi->ComputeElectronCrossSection(cosThetaMin, costm);
      nucsec += esec;
      if(nucsec > 0.0) { esec /= nucsec; }
      xtsec += nucsec*density;
    }
    xsecn[i] = xtsec;
    prob[i]  = esec;
    //G4cout << i << "  xs= " << xs << " xtsec= " << xtsec 
    //       << " 1-cosThetaMin= " << 1-cosThetaMin 
    //           << " 1-cosTetMaxNuc2= " <<1-cosTetMaxNuc2<< G4endl;
  }
  
  //G4cout << "ComputeXS result:  xsec(1/mm)= " << xs 
  //       << " txsec(1/mm)= " << xtsec <<G4endl; 
  return xs;
}

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DefineMaterial()

void G4WentzelVIRelModel::DefineMaterial ( const G4MaterialCutsCouple *  cup )

inlineprivate

Definition at line 161 of file G4WentzelVIRelModel.hh.

{ 
  if(cup != currentCouple) {
    currentCouple = cup;
    SetCurrentCouple(cup); 
    currentMaterial = cup->GetMaterial();
    currentMaterialIndex = currentCouple->GetIndex(); 
  }
}

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Initialise()

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

virtual

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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operator=()

G4WentzelVIRelModel& G4WentzelVIRelModel::operator= ( const G4WentzelVIRelModel &  right )

private

SampleScattering()

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

virtual

Reimplemented from G4VMscModel.

Definition at line 412 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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SetupParticle()

void G4WentzelVIRelModel::SetupParticle ( const G4ParticleDefinition *  p )

inlineprivate

Definition at line 173 of file G4WentzelVIRelModel.hh.

{
  // Initialise mass and charge
  if(p != particle) {
    particle = p;
    wokvi->SetupParticle(p);
  }
}

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StartTracking()

void G4WentzelVIRelModel::StartTracking ( G4Track *  track )

virtual

Reimplemented from G4VEmModel.

Definition at line 177 of file G4WentzelVIRelModel.cc.

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

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Member Data Documentation

cosTetMaxNuc

G4double G4WentzelVIRelModel::cosTetMaxNuc

private

Definition at line 145 of file G4WentzelVIRelModel.hh.

cosThetaMax

G4double G4WentzelVIRelModel::cosThetaMax

private

Definition at line 144 of file G4WentzelVIRelModel.hh.

cosThetaMin

G4double G4WentzelVIRelModel::cosThetaMin

private

Definition at line 143 of file G4WentzelVIRelModel.hh.

currentCouple

const G4MaterialCutsCouple* G4WentzelVIRelModel::currentCouple

private

Definition at line 139 of file G4WentzelVIRelModel.hh.

currentCuts

const G4DataVector* G4WentzelVIRelModel::currentCuts

private

Definition at line 117 of file G4WentzelVIRelModel.hh.

currentMaterial

const G4Material* G4WentzelVIRelModel::currentMaterial

private

Definition at line 140 of file G4WentzelVIRelModel.hh.

currentMaterialIndex

G4int G4WentzelVIRelModel::currentMaterialIndex

private

Definition at line 138 of file G4WentzelVIRelModel.hh.

currentRange

G4double G4WentzelVIRelModel::currentRange

private

Definition at line 127 of file G4WentzelVIRelModel.hh.

fG4pow

G4Pow* G4WentzelVIRelModel::fG4pow

private

Definition at line 115 of file G4WentzelVIRelModel.hh.

fNistManager

G4NistManager* G4WentzelVIRelModel::fNistManager

private

Definition at line 112 of file G4WentzelVIRelModel.hh.

fParticleChange

G4ParticleChangeForMSC* G4WentzelVIRelModel::fParticleChange

private

Definition at line 113 of file G4WentzelVIRelModel.hh.

inside

G4bool G4WentzelVIRelModel::inside

private

Definition at line 153 of file G4WentzelVIRelModel.hh.

invsqrt12

G4double G4WentzelVIRelModel::invsqrt12

private

Definition at line 120 of file G4WentzelVIRelModel.hh.

isCombined

G4bool G4WentzelVIRelModel::isCombined

private

Definition at line 152 of file G4WentzelVIRelModel.hh.

lambdaeff

G4double G4WentzelVIRelModel::lambdaeff

private

Definition at line 126 of file G4WentzelVIRelModel.hh.

lowEnergyLimit

G4double G4WentzelVIRelModel::lowEnergyLimit

private

Definition at line 149 of file G4WentzelVIRelModel.hh.

nelments

G4int G4WentzelVIRelModel::nelments

private

Definition at line 133 of file G4WentzelVIRelModel.hh.

numlimit

G4double G4WentzelVIRelModel::numlimit

private

Definition at line 135 of file G4WentzelVIRelModel.hh.

particle

const G4ParticleDefinition* G4WentzelVIRelModel::particle

private

Definition at line 148 of file G4WentzelVIRelModel.hh.

preKinEnergy

G4double G4WentzelVIRelModel::preKinEnergy

private

Definition at line 123 of file G4WentzelVIRelModel.hh.

prob

std::vector<G4double> G4WentzelVIRelModel::prob

private

Definition at line 132 of file G4WentzelVIRelModel.hh.

singleScatteringMode

G4bool G4WentzelVIRelModel::singleScatteringMode

private

Definition at line 154 of file G4WentzelVIRelModel.hh.

theManager

G4LossTableManager* G4WentzelVIRelModel::theManager

private

Definition at line 111 of file G4WentzelVIRelModel.hh.

tlimitminfix

G4double G4WentzelVIRelModel::tlimitminfix

private

Definition at line 119 of file G4WentzelVIRelModel.hh.

tPathLength

G4double G4WentzelVIRelModel::tPathLength

private

Definition at line 124 of file G4WentzelVIRelModel.hh.

wokvi

G4WentzelVIRelXSection* G4WentzelVIRelModel::wokvi

private

Definition at line 114 of file G4WentzelVIRelModel.hh.

xsecn

std::vector<G4double> G4WentzelVIRelModel::xsecn

private

Definition at line 131 of file G4WentzelVIRelModel.hh.

xtsec

G4double G4WentzelVIRelModel::xtsec

private

Definition at line 130 of file G4WentzelVIRelModel.hh.

zPathLength

G4double G4WentzelVIRelModel::zPathLength

private

Definition at line 125 of file G4WentzelVIRelModel.hh.

---

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

• G4WentzelVIRelModel.hh
• G4WentzelVIRelModel.cc