#include <G4PAIModel.hh>

Inheritance diagram for G4PAIModel:

Public Member Functions
	G4PAIModel (const G4ParticleDefinition *p=0, const G4String &nam="PAI")

virtual	~G4PAIModel ()

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

virtual void	InitialiseMe (const G4ParticleDefinition *)

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

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

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

virtual G4double	SampleFluctuations (const G4Material , const G4DynamicParticle , G4double &, G4double &, G4double &)

virtual G4double	Dispersion (const G4Material , const G4DynamicParticle , G4double &, G4double &)

void	DefineForRegion (const G4Region *r)

void	ComputeSandiaPhotoAbsCof ()

void	BuildPAIonisationTable ()

void	BuildLambdaVector ()

G4double	GetdNdxCut (G4int iPlace, G4double transferCut)

G4double	GetdEdxCut (G4int iPlace, G4double transferCut)

G4double	GetPostStepTransfer (G4double scaledTkin)

G4double	GetEnergyTransfer (G4int iPlace, G4double position, G4int iTransfer)

void	SetVerboseLevel (G4int verbose)

Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)

virtual	~G4VEmModel ()

virtual void	Initialise (const G4ParticleDefinition *, const G4DataVector &)=0

virtual void	SampleSecondaries (std::vector< G4DynamicParticle * > , const G4MaterialCutsCouple , const G4DynamicParticle *, G4double tmin=0.0, G4double tmax=DBL_MAX)=0

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

virtual G4double	ChargeSquareRatio (const G4Track &)

virtual G4double	GetChargeSquareRatio (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual G4double	GetParticleCharge (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	StartTracking (G4Track *)

virtual void	CorrectionsAlongStep (const G4MaterialCutsCouple , const G4DynamicParticle , G4double &eloss, G4double &niel, G4double length)

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

virtual G4double	MinPrimaryEnergy (const G4Material , const G4ParticleDefinition )

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

virtual void	DefineForRegion (const G4Region *)

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

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)

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=0)

void	SetCrossSectionTable (G4PhysicsTable *)

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

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	ForceBuildTable (G4bool val)

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

const G4Element *	GetCurrentElement () const

Public Member Functions inherited from G4VEmFluctuationModel
	G4VEmFluctuationModel (const G4String &nam)

virtual	~G4VEmFluctuationModel ()

virtual G4double	SampleFluctuations (const G4Material , const G4DynamicParticle , G4double &tmax, G4double &length, G4double &meanLoss)=0

virtual G4double	Dispersion (const G4Material , const G4DynamicParticle , G4double &tmax, G4double &length)=0

virtual void	InitialiseMe (const G4ParticleDefinition *)

virtual void	SetParticleAndCharge (const G4ParticleDefinition *, G4double q2)

G4String	GetName () const

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

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 *)

Additional Inherited Members
Protected Attributes inherited from G4VEmModel
G4VParticleChange *	pParticleChange

G4PhysicsTable *	xSectionTable

const std::vector< G4double > *	theDensityFactor

const std::vector< G4int > *	theDensityIdx

Detailed Description

Definition at line 67 of file G4PAIModel.hh.

Constructor & Destructor Documentation

◆ G4PAIModel()

G4PAIModel::G4PAIModel	(	const G4ParticleDefinition *	p = `0`,
		const G4String &	nam = `"PAI"`
	)

Definition at line 74 of file G4PAIModel.cc.

  : G4VEmModel(nam),G4VEmFluctuationModel(nam),
  fVerbose(0),
  fLowestGamma(1.005),
  fHighestGamma(10000.),
  fTotBin(200),
  fMeanNumber(20),
  fParticle(0),
  fHighKinEnergy(100.*TeV),
  fTwoln10(2.0*log(10.0)),
  fBg2lim(0.0169),
  fTaulim(8.4146e-3)
{  
  fElectron = G4Electron::Electron();
  fPositron = G4Positron::Positron();
 
  fPAItransferTable  = 0;
  fPAIdEdxTable      = 0;
  fSandiaPhotoAbsCof = 0;
  fdEdxVector        = 0;
  fLambdaVector      = 0;
  fdNdxCutVector     = 0;
  fParticleEnergyVector = 0;
  fSandiaIntervalNumber = 0;
  fMatIndex = 0;
  fDeltaCutInKinEnergy = 0.0;
  fParticleChange = 0;
  fMaterial = 0;
  fCutCouple = 0;
 
  if(p) { SetParticle(p); }
  else  { SetParticle(fElectron); }
 
  isInitialised      = false;
}

◆ ~G4PAIModel()

G4PAIModel::~G4PAIModel ( )

virtual

Definition at line 112 of file G4PAIModel.cc.

{
  //  G4cout << "PAI: start destruction" << G4endl;
  if(fParticleEnergyVector) delete fParticleEnergyVector;
  if(fdEdxVector)           delete fdEdxVector ;
  if(fLambdaVector)         delete fLambdaVector;
  if(fdNdxCutVector)        delete fdNdxCutVector;
 
  if( fPAItransferTable )
    {
      fPAItransferTable->clearAndDestroy();
      delete fPAItransferTable ;
    }
  if( fPAIdEdxTable )
    {
      fPAIdEdxTable->clearAndDestroy();
      delete fPAIdEdxTable ;
    }
  if(fSandiaPhotoAbsCof)
    {
      for(G4int i=0;i<fSandiaIntervalNumber;i++)
    {
      delete[] fSandiaPhotoAbsCof[i];
    }
      delete[] fSandiaPhotoAbsCof;
    }
  //G4cout << "PAI: end destruction" << G4endl;
}

Member Function Documentation

◆ BuildLambdaVector()

void G4PAIModel::BuildLambdaVector ( )

Definition at line 346 of file G4PAIModel.cc.

{
  fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy,
                      fHighestKineticEnergy,
                      fTotBin                ) ;
  fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy,
                      fHighestKineticEnergy,
                      fTotBin                ) ;
  if(fVerbose > 1)
  {
    G4cout<<"PAIModel DeltaCutInKineticEnergyNow = "
      <<fDeltaCutInKinEnergy/keV<<" keV"<<G4endl;
  }
  for (G4int i = 0 ; i <= fTotBin ; i++ )
  {
    G4double dNdxCut = GetdNdxCut(i,fDeltaCutInKinEnergy) ;
    //G4cout << "i= " << i << " x= " << dNdxCut << G4endl;
    if(dNdxCut < 0.0) dNdxCut = 0.0; 
    //    G4double lambda = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut ;
    G4double lambda = DBL_MAX;
    if(dNdxCut > 0.0) lambda = 1.0/dNdxCut;
 
    fLambdaVector->PutValue(i, lambda) ;
    fdNdxCutVector->PutValue(i, dNdxCut) ;
  }
}

Referenced by Initialise().

◆ BuildPAIonisationTable()

void G4PAIModel::BuildPAIonisationTable ( )

Definition at line 282 of file G4PAIModel.cc.

{
  G4double LowEdgeEnergy , ionloss ;
  G4double tau, Tmax, Tmin, Tkin, deltaLow, /*gamma,*/ bg2 ;
 
  fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy,
                    fHighestKineticEnergy,
                    fTotBin);
  G4SandiaTable* sandia = fMaterial->GetSandiaTable();
 
  Tmin = sandia->GetSandiaCofForMaterialPAI(0,0)*keV;
  deltaLow = 100.*eV; // 0.5*eV ;
 
  for (G4int i = 0 ; i <= fTotBin ; i++)  //The loop for the kinetic energy
  {
    LowEdgeEnergy = fParticleEnergyVector->GetLowEdgeEnergy(i) ;
    tau = LowEdgeEnergy/fMass ;
    //gamma = tau +1. ;
    // G4cout<<"gamma = "<<gamma<<endl ;
    bg2 = tau*( tau + 2. );
    Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy); 
    //    Tmax = std::min(fDeltaCutInKinEnergy, Tmax);
    Tkin = Tmax ;
 
    if ( Tmax < Tmin + deltaLow )  // low energy safety
      Tkin = Tmin + deltaLow ;
 
    fPAIySection.Initialize(fMaterial, Tkin, bg2);
 
    // G4cout<<"ionloss = "<<ionloss*cm/keV<<" keV/cm"<<endl ;
    // G4cout<<"n1 = "<<protonPAI.GetIntegralPAIxSection(1)*cm<<" 1/cm"<<endl ;
    // G4cout<<"protonPAI.GetSplineSize() = "<<
    //    protonPAI.GetSplineSize()<<G4endl<<G4endl ;
 
    G4int n = fPAIySection.GetSplineSize();
    G4PhysicsFreeVector* transferVector = new G4PhysicsFreeVector(n) ;
    G4PhysicsFreeVector* dEdxVector = new G4PhysicsFreeVector(n);
 
    for( G4int k = 0 ; k < n; k++ )
    {
      transferVector->PutValue( k ,
                                fPAIySection.GetSplineEnergy(k+1),
                                fPAIySection.GetIntegralPAIySection(k+1) ) ;
      dEdxVector->PutValue( k ,
                                fPAIySection.GetSplineEnergy(k+1),
                                fPAIySection.GetIntegralPAIdEdx(k+1) ) ;
    }
    ionloss = fPAIySection.GetMeanEnergyLoss() ;   //  total <dE/dx>
 
    if ( ionloss < DBL_MIN) { ionloss = 0.0; }
    fdEdxVector->PutValue(i,ionloss) ;
 
    fPAItransferTable->insertAt(i,transferVector) ;
    fPAIdEdxTable->insertAt(i,dEdxVector) ;
 
  }                                        // end of Tkin loop
}

Referenced by Initialise().

◆ ComputeDEDXPerVolume()

G4double G4PAIModel::ComputeDEDXPerVolume	(	const G4Material *	,
		const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 468 of file G4PAIModel.cc.

{
  G4int iTkin,iPlace;
  
  //G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy);
  G4double cut = cutEnergy;
 
  G4double massRatio  = fMass/p->GetPDGMass();
  G4double scaledTkin = kineticEnergy*massRatio;
  G4double charge     = p->GetPDGCharge();
  G4double charge2    = charge*charge;
  const G4MaterialCutsCouple* matCC = CurrentCouple();
 
  size_t jMat = 0;
  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
  {
    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
  }
  //G4cout << "jMat= " << jMat 
  //     << " jMax= " << fMaterialCutsCoupleVector.size()
  //       << " matCC: " << matCC;
  //if(matCC) G4cout << " mat: " << matCC->GetMaterial()->GetName();
  //  G4cout << G4endl;
  if(jMat == fMaterialCutsCoupleVector.size()) return 0.0;
 
  fPAIdEdxTable = fPAIdEdxBank[jMat];
  fdEdxVector = fdEdxTable[jMat];
  for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++)
  {
    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ;    
  }
  //G4cout << "E= " << scaledTkin << " iTkin= " << iTkin 
  //     << "  " << fdEdxVector->GetVectorLength()<<G4endl; 
  iPlace = iTkin - 1;
  if(iPlace < 0) iPlace = 0;
  else if(iPlace >= fTotBin) iPlace = fTotBin-1;
  G4double dEdx = charge2*( (*fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cut) );
  if( dEdx < 0.) dEdx = 0.;
  return dEdx;
}

◆ ComputeSandiaPhotoAbsCof()

void G4PAIModel::ComputeSandiaPhotoAbsCof ( )

Definition at line 232 of file G4PAIModel.cc.

{ 
  G4int i, j;
  const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
 
  G4SandiaTable thisMaterialSandiaTable(fMatIndex) ;
  G4int numberOfElements = 
    (*theMaterialTable)[fMatIndex]->GetNumberOfElements();
 
  G4int* thisMaterialZ = new G4int[numberOfElements] ;
 
  for(i=0;i<numberOfElements;i++)  
  {
    thisMaterialZ[i] = 
    (G4int)(*theMaterialTable)[fMatIndex]->GetElement(i)->GetZ() ;
  }  
  fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaIntervals
                           (thisMaterialZ,numberOfElements) ;
 
  fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaMixing
                           ( thisMaterialZ ,
                             (*theMaterialTable)[fMatIndex]->GetFractionVector() ,
                     numberOfElements,fSandiaIntervalNumber) ;
   
  fSandiaPhotoAbsCof = new G4double*[fSandiaIntervalNumber] ;
 
  for(i=0; i<fSandiaIntervalNumber; i++)  
  {
    fSandiaPhotoAbsCof[i] = new G4double[5];
  }
   
  for( i = 0 ; i < fSandiaIntervalNumber ; i++ )
  {
    fSandiaPhotoAbsCof[i][0] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,0); 
 
    for( j = 1; j < 5 ; j++ )
    {
      fSandiaPhotoAbsCof[i][j] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,j)*
                 (*theMaterialTable)[fMatIndex]->GetDensity() ;
    }
  }
  delete[] thisMaterialZ;
}

◆ CrossSectionPerVolume()

G4double G4PAIModel::CrossSectionPerVolume	(	const G4Material *	,
		const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

virtual

Reimplemented from G4VEmModel.

Definition at line 514 of file G4PAIModel.cc.

{
  G4int iTkin,iPlace;
  G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
  if(tmax <= cutEnergy) return 0.0;
  G4double massRatio  = fMass/p->GetPDGMass();
  G4double scaledTkin = kineticEnergy*massRatio;
  G4double charge     = p->GetPDGCharge();
  G4double charge2    = charge*charge, cross, cross1, cross2;
  const G4MaterialCutsCouple* matCC = CurrentCouple();
 
  size_t jMat = 0;
  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
  {
    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
  }
  if(jMat == fMaterialCutsCoupleVector.size()) return 0.0;
 
  fPAItransferTable = fPAIxscBank[jMat];
 
  for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++)
  {
    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ;    
  }
  iPlace = iTkin - 1;
  if(iPlace < 0) iPlace = 0;
  else if(iPlace >= fTotBin) iPlace = fTotBin-1; 
 
  //G4cout<<"iPlace = "<<iPlace<<"; tmax = "
  // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl;  
  cross1 = GetdNdxCut(iPlace,tmax) ;
  //G4cout<<"cross1 = "<<cross1<<G4endl;  
  cross2 = GetdNdxCut(iPlace,cutEnergy) ;  
  //G4cout<<"cross2 = "<<cross2<<G4endl;  
  cross  = (cross2-cross1)*charge2;
  //G4cout<<"cross = "<<cross<<G4endl;  
  if( cross < DBL_MIN) cross = 0.0;
  //  if( cross2 < DBL_MIN) cross2 = DBL_MIN;
 
  // return cross2;
  return cross;
}

◆ DefineForRegion()

void G4PAIModel::DefineForRegion ( const G4Region * r )

virtual

Reimplemented from G4VEmModel.

Definition at line 994 of file G4PAIModel.cc.

{
  fPAIRegionVector.push_back(r);
}

◆ Dispersion()

G4double G4PAIModel::Dispersion	(	const G4Material *	material,
		const G4DynamicParticle *	aParticle,
		G4double &	tmax,
		G4double &	step
	)

virtual

Implements G4VEmFluctuationModel.

Definition at line 958 of file G4PAIModel.cc.

{
  G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.;
  for(G4int i = 0 ; i < fMeanNumber; i++)
  {
    loss      = SampleFluctuations(material,aParticle,tmax,step,meanLoss);
    sumLoss  += loss;
    sumLoss2 += loss*loss;
  }
  meanLoss = sumLoss/fMeanNumber;
  sigma2   = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber;
  return sigma2;
}

◆ GetdEdxCut()

G4double G4PAIModel::GetdEdxCut	(	G4int	iPlace,
		G4double	transferCut
	)

Definition at line 424 of file G4PAIModel.cc.

{ 
  G4int iTransfer;
  G4double x1, x2, y1, y2, dEdxCut;
  //G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
  // G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength())
  //           <<G4endl;  
  for( iTransfer = 0 ; 
       iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ; 
       iTransfer++)
  {
    if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
    {
      break ;
    }
  }  
  if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) )
  {
      iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ;
  }
  y1 = (*(*fPAIdEdxTable)(iPlace))(iTransfer-1) ;
  y2 = (*(*fPAIdEdxTable)(iPlace))(iTransfer) ;
  if(y1 < 0.0) y1 = 0.0;
  if(y2 < 0.0) y2 = 0.0;
  //G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
  x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
  x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
  //G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
 
  if ( y1 == y2 )    dEdxCut = y2 ;
  else
  {
    //  if ( x1 == x2  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
    //    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*0.5 ;
    else             dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;      
  }
  //G4cout<<""<<dEdxCut<<G4endl;
  if(dEdxCut < 0.0) dEdxCut = 0.0; 
  return dEdxCut ;
}

Referenced by ComputeDEDXPerVolume().

◆ GetdNdxCut()

G4double G4PAIModel::GetdNdxCut	(	G4int	iPlace,
		G4double	transferCut
	)

Definition at line 378 of file G4PAIModel.cc.

{ 
  G4int iTransfer;
  G4double x1, x2, y1, y2, dNdxCut;
  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
  // G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength())
  //           <<G4endl;  
  for( iTransfer = 0 ; 
       iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ; 
       iTransfer++)
  {
    if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
    {
      break ;
    }
  }  
  if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) )
  {
      iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ;
  }
  y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1) ;
  y2 = (*(*fPAItransferTable)(iPlace))(iTransfer) ;
  if(y1 < 0.0) y1 = 0.0;
  if(y2 < 0.0) y2 = 0.0;
  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
  x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
  x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
 
  if ( y1 == y2 )    dNdxCut = y2 ;
  else
  {
    //  if ( x1 == x2  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
    //    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*0.5 ;
    else             dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;      
  }
  //  G4cout<<""<<dNdxCut<<G4endl;
  if(dNdxCut < 0.0) dNdxCut = 0.0; 
  return dNdxCut ;
}

Referenced by BuildLambdaVector(), and CrossSectionPerVolume().

◆ GetEnergyTransfer()

G4double G4PAIModel::GetEnergyTransfer	(	G4int	iPlace,
		G4double	position,
		G4int	iTransfer
	)

Definition at line 737 of file G4PAIModel.cc.

{ 
  G4int iTransferMax;
  G4double x1, x2, y1, y2, energyTransfer;
 
  if(iTransfer == 0)
  {
    energyTransfer = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
  }  
  else
  {
    iTransferMax = G4int((*fPAItransferTable)(iPlace)->GetVectorLength());
 
    if ( iTransfer >= iTransferMax )  iTransfer = iTransferMax - 1;
    
    y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1);
    y2 = (*(*fPAItransferTable)(iPlace))(iTransfer);
 
    x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1);
    x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
 
    if ( x1 == x2 )    energyTransfer = x2;
    else
    {
      if ( y1 == y2  ) energyTransfer = x1 + (x2 - x1)*G4UniformRand();
      else
      {
        energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1);
      }
    }
  }
  return energyTransfer;
}

Referenced by GetPostStepTransfer(), and SampleFluctuations().

◆ GetPostStepTransfer()

G4double G4PAIModel::GetPostStepTransfer ( G4double scaledTkin )

Definition at line 649 of file G4PAIModel.cc.

{  
  // G4cout<<"G4PAIModel::GetPostStepTransfer"<<G4endl ;
 
  G4int iTkin, iTransfer, iPlace  ;
  G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ;
 
  for(iTkin=0;iTkin<=fTotBin;iTkin++)
  {
    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin))  break ;
  }
  iPlace = iTkin - 1 ;
  // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ;
  if(iPlace < 0) iPlace = 0;
  else if(iPlace >= fTotBin) iPlace = fTotBin-1; 
  dNdxCut1 = (*fdNdxCutVector)(iPlace) ;  
  // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ;
 
 
  if(iTkin == fTotBin) // Fermi plato, try from left
  {
      position = dNdxCut1*G4UniformRand() ;
 
      for( iTransfer = 0;
 iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
      {
        if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ;
      }
      transfer = GetEnergyTransfer(iPlace,position,iTransfer);
  }
  else
  {
    dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ;  
    // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ;
    if(iTkin == 0) // Tkin is too small, trying from right only
    {
      position = dNdxCut2*G4UniformRand() ;
 
      for( iTransfer = 0;
  iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
      {
        if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ;
      }
      transfer = GetEnergyTransfer(iPlace+1,position,iTransfer);
    } 
    else // general case: Tkin between two vectors of the material
    {
      E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
      E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin)     ;
      W  = 1.0/(E2 - E1) ;
      W1 = (E2 - scaledTkin)*W ;
      W2 = (scaledTkin - E1)*W ;
 
      position = ( dNdxCut1*W1 + dNdxCut2*W2 )*G4UniformRand() ;
 
        // G4cout<<position<<"\t" ;
 
      G4int iTrMax1, iTrMax2, iTrMax;
 
      iTrMax1 = G4int((*fPAItransferTable)(iPlace)->GetVectorLength());
      iTrMax2 = G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength());
 
      if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2;
      else                    iTrMax = iTrMax1;
 
 
      for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ )
      {
          if( position >=
          ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 +
            (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) break ;
      }
      transfer = GetEnergyTransfer(iPlace,position,iTransfer);
    }
  } 
  // G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ; 
  if(transfer < 0.0 ) transfer = 0.0 ;
  // if(transfer < DBL_MIN ) transfer = DBL_MIN;
 
  return transfer ;
}

Referenced by SampleSecondaries().

◆ Initialise()

void G4PAIModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &
	)

virtual

Implements G4VEmModel.

Definition at line 160 of file G4PAIModel.cc.

{
  if( fVerbose > 0 && p->GetParticleName()=="proton") 
  {
    G4cout<<"G4PAIModel::Initialise for "<<p->GetParticleName()<<G4endl;
    fPAIySection.SetVerbose(1);
  }
  else fPAIySection.SetVerbose(0);
 
  if(isInitialised) { return; }
  isInitialised = true;
 
  SetParticle(p);
 
  fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy,
                         fHighestKineticEnergy,
                         fTotBin);
 
  fParticleChange = GetParticleChangeForLoss();
 
  // Prepare initialization
  const G4ProductionCutsTable* theCoupleTable =
        G4ProductionCutsTable::GetProductionCutsTable();
  const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
  size_t numOfMat   = G4Material::GetNumberOfMaterials();
  size_t numRegions = fPAIRegionVector.size();
 
  for(size_t iReg = 0; iReg < numRegions; ++iReg) // region loop
  {
    const G4Region* curReg = fPAIRegionVector[iReg];
 
    for(size_t jMat = 0; jMat < numOfMat; ++jMat) // region material loop
    {
      fMaterial  = (*theMaterialTable)[jMat];
      fCutCouple = theCoupleTable->GetMaterialCutsCouple( fMaterial, 
                      curReg->GetProductionCuts() );
      //G4cout << "Reg <" <<curReg->GetName() << ">  mat <" 
      //         << fMaterial->GetName() << ">  fCouple= " 
      //         << fCutCouple<<"  " << p->GetParticleName() <<G4endl;
      if( fCutCouple ) 
      {
    fMaterialCutsCoupleVector.push_back(fCutCouple);
 
    fPAItransferTable = new G4PhysicsTable(fTotBin+1);
    fPAIdEdxTable = new G4PhysicsTable(fTotBin+1);
 
    fDeltaCutInKinEnergy = 
      (*theCoupleTable->GetEnergyCutsVector(1))[fCutCouple->GetIndex()];
     
    //ComputeSandiaPhotoAbsCof();
    BuildPAIonisationTable();
 
    fPAIxscBank.push_back(fPAItransferTable);
    fPAIdEdxBank.push_back(fPAIdEdxTable);
    fdEdxTable.push_back(fdEdxVector);
 
    BuildLambdaVector();
    fdNdxCutTable.push_back(fdNdxCutVector);
    fLambdaTable.push_back(fLambdaVector);
      }
    }
  }
}

◆ InitialiseMe()

void G4PAIModel::InitialiseMe ( const G4ParticleDefinition * )

virtual

Reimplemented from G4VEmFluctuationModel.

Definition at line 227 of file G4PAIModel.cc.

228{}

◆ MaxSecondaryEnergy()

G4double G4PAIModel::MaxSecondaryEnergy	(	const G4ParticleDefinition *	p,
		G4double	kinEnergy
	)

protectedvirtual

Reimplemented from G4VEmModel.

Definition at line 977 of file G4PAIModel.cc.

{
  G4double tmax = kinEnergy;
  if(p == fElectron) tmax *= 0.5;
  else if(p != fPositron) { 
    G4double mass = p->GetPDGMass();
    G4double ratio= electron_mass_c2/mass;
    G4double gamma= kinEnergy/mass + 1.0;
    tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
                  (1. + 2.0*gamma*ratio + ratio*ratio);
  }
  return tmax;
}

Referenced by BuildPAIonisationTable(), and CrossSectionPerVolume().

◆ SampleFluctuations()

G4double G4PAIModel::SampleFluctuations	(	const G4Material *	material,
		const G4DynamicParticle *	aParticle,
		G4double &	,
		G4double &	step,
		G4double &
	)

virtual

Implements G4VEmFluctuationModel.

Definition at line 773 of file G4PAIModel.cc.

{
  size_t jMat = 0;
  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
  {
    if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break;
  }
  if(jMat == fMaterialCutsCoupleVector.size()) return 0.0;
 
  fPAItransferTable = fPAIxscBank[jMat];
  fdNdxCutVector   = fdNdxCutTable[jMat];
 
  G4int iTkin, iTransfer, iPlace;
  G4long numOfCollisions=0;
 
  //G4cout<<"G4PAIModel::SampleFluctuations"<<G4endl ;
  //G4cout<<"in: "<<fMaterialCutsCoupleVector[jMat]->GetMaterial()->GetName()<<G4endl;
  G4double loss = 0.0, charge2 ;
  G4double stepSum = 0., stepDelta, lambda, omega; 
  G4double position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber;
  G4bool numb = true;
  G4double Tkin       = aParticle->GetKineticEnergy() ;
  G4double MassRatio  = fMass/aParticle->GetDefinition()->GetPDGMass() ;
  G4double charge     = aParticle->GetDefinition()->GetPDGCharge() ;
  charge2             = charge*charge ;
  G4double TkinScaled = Tkin*MassRatio ;
 
  for(iTkin=0;iTkin<=fTotBin;iTkin++)
  {
    if(TkinScaled < fParticleEnergyVector->GetLowEdgeEnergy(iTkin))   break ;
  }
  iPlace = iTkin - 1 ; 
  if(iPlace < 0) iPlace = 0;
  else if(iPlace >= fTotBin) iPlace = fTotBin - 1;
  //G4cout<<"from search, iPlace = "<<iPlace<<G4endl ;
  dNdxCut1 = (*fdNdxCutVector)(iPlace) ;  
  //G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ;
 
  if(iTkin == fTotBin) // Fermi plato, try from left
  {
    meanNumber =((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*step*charge2;
    if(meanNumber < 0.) meanNumber = 0. ;
    //  numOfCollisions = RandPoisson::shoot(meanNumber) ;
    // numOfCollisions = G4Poisson(meanNumber) ;
    if( meanNumber > 0.) lambda = step/meanNumber;
    else                 lambda = DBL_MAX;
    while(numb)
    {
     stepDelta = CLHEP::RandExponential::shoot(lambda);
     stepSum += stepDelta;
     if(stepSum >= step) break;
     numOfCollisions++;
    }   
    //G4cout<<"##1 numOfCollisions = "<<numOfCollisions<<G4endl ;
 
    while(numOfCollisions)
    {
      position = dNdxCut1+
                 ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*G4UniformRand() ;
 
      for( iTransfer = 0;
   iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
      {
        if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ;
      }
      omega = GetEnergyTransfer(iPlace,position,iTransfer);
      //G4cout<<"G4PAIModel::SampleFluctuations, omega = "<<omega/keV<<" keV; "<<"\t";
      loss += omega;
      numOfCollisions-- ;
    }
  }
  else
  {
    dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; 
    //G4cout<<"dNdxCut2 = "<<dNdxCut2<< " iTkin= "<<iTkin<<" iPlace= "<<iPlace<<G4endl;
 
    if(iTkin == 0) // Tkin is too small, trying from right only
    {
      meanNumber =((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*step*charge2;
      if( meanNumber < 0. ) meanNumber = 0. ;
      //  numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ;
      //  numOfCollisions = G4Poisson(meanNumber) ;
      if( meanNumber > 0.) lambda = step/meanNumber;
      else                 lambda = DBL_MAX;
      while(numb)
    {
      stepDelta = CLHEP::RandExponential::shoot(lambda);
      stepSum += stepDelta;
      if(stepSum >= step) break;
      numOfCollisions++;
    }   
 
      //G4cout<<"##2 numOfCollisions = "<<numOfCollisions<<G4endl ;
 
      while(numOfCollisions)
      {
        position = dNdxCut2+
                   ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*G4UniformRand();
   
        for( iTransfer = 0;
   iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
        {
          if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ;
        }
        omega = GetEnergyTransfer(iPlace,position,iTransfer);
        //G4cout<<omega/keV<<"\t";
        loss += omega;
        numOfCollisions-- ;
      }
    } 
    else // general case: Tkin between two vectors of the material
    {
      E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
      E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin)     ;
       W = 1.0/(E2 - E1) ;
      W1 = (E2 - TkinScaled)*W ;
      W2 = (TkinScaled - E1)*W ;
 
      //G4cout << fPAItransferTable->size() << G4endl;
      //G4cout<<"(*(*fPAItransferTable)(iPlace))(0) = "<<
      //   (*(*fPAItransferTable)(iPlace))(0)<<G4endl ;
      //G4cout<<"(*(*fPAItransferTable)(iPlace+1))(0) = "<<
      //     (*(*fPAItransferTable)(iPlace+1))(0)<<G4endl ;
 
      meanNumber=( ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*W1 + 
           ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*W2 )*step*charge2;
      if(meanNumber<0.0) meanNumber = 0.0;
      //  numOfCollisions = RandPoisson::shoot(meanNumber) ;
      // numOfCollisions = G4Poisson(meanNumber) ;
      if( meanNumber > 0.) lambda = step/meanNumber;
      else                 lambda = DBL_MAX;
      while(numb)
    {
      stepDelta = CLHEP::RandExponential::shoot(lambda);
      stepSum += stepDelta;
      if(stepSum >= step) break;
      numOfCollisions++;
    }   
 
      //G4cout<<"##3 numOfCollisions = "<<numOfCollisions<<endl ;
 
      while(numOfCollisions)
      {
        position = dNdxCut1*W1 + dNdxCut2*W2 +
                 ( ( (*(*fPAItransferTable)(iPlace))(0)-dNdxCut1 )*W1 + 
                    dNdxCut2+
                  ( (*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2 )*W2 )*G4UniformRand();
 
        // G4cout<<position<<"\t" ;
 
        for( iTransfer = 0;
    iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
        {
          if( position >=
          ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + 
            (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) )
          {
          break ;
      }
        }
    omega =  GetEnergyTransfer(iPlace,position,iTransfer);
    //  G4cout<<omega/keV<<"\t";
        loss += omega;
        numOfCollisions-- ;    
      }
    }
  } 
  //G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = "
  //  <<step/mm<<" mm"<<G4endl ; 
  if(loss > Tkin) loss=Tkin;
  if(loss < 0.  ) loss = 0.;
  return loss ;
 
}

Referenced by Dispersion().

◆ SampleSecondaries()

void G4PAIModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vdp,
		const G4MaterialCutsCouple *	matCC,
		const G4DynamicParticle *	dp,
		G4double	tmin,
		G4double	maxEnergy
	)

virtual

Implements G4VEmModel.

Definition at line 566 of file G4PAIModel.cc.

{
  size_t jMat = 0;
  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
  {
    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
  }
  if(jMat == fMaterialCutsCoupleVector.size()) return;
 
  fPAItransferTable = fPAIxscBank[jMat];
  fdNdxCutVector    = fdNdxCutTable[jMat];
 
  G4double tmax = std::min(MaxSecondaryKinEnergy(dp), maxEnergy);
  if( tmin >= tmax && fVerbose > 0)
  {
    G4cout<<"G4PAIModel::SampleSecondary: tmin >= tmax "<<G4endl;
  }
  G4ThreeVector direction= dp->GetMomentumDirection();
  G4double particleMass  = dp->GetMass();
  G4double kineticEnergy = dp->GetKineticEnergy();
 
  G4double massRatio     = fMass/particleMass;
  G4double scaledTkin    = kineticEnergy*massRatio;
  G4double totalEnergy   = kineticEnergy + particleMass;
  G4double pSquare       = kineticEnergy*(totalEnergy+particleMass);
 
  G4double deltaTkin     = GetPostStepTransfer(scaledTkin);
 
  // G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV<<" keV "<<G4endl;
 
  if( deltaTkin <= 0. && fVerbose > 0) 
  {
    G4cout<<"G4PAIModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl;
  }
  if( deltaTkin <= 0.) return;
 
  if( deltaTkin > tmax) deltaTkin = tmax;
 
  G4double deltaTotalMomentum = sqrt(deltaTkin*(deltaTkin + 2. * electron_mass_c2 ));
  G4double totalMomentum      = sqrt(pSquare);
  G4double costheta           = deltaTkin*(totalEnergy + electron_mass_c2)
                                /(deltaTotalMomentum * totalMomentum);
 
  if( costheta > 0.99999 ) costheta = 0.99999;
  G4double sintheta = 0.0;
  G4double sin2 = 1. - costheta*costheta;
  if( sin2 > 0.) sintheta = sqrt(sin2);
 
  //  direction of the delta electron
  G4double phi  = twopi*G4UniformRand(); 
  G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta;
 
  G4ThreeVector deltaDirection(dirx,diry,dirz);
  deltaDirection.rotateUz(direction);
  deltaDirection.unit();
 
  // primary change
  kineticEnergy -= deltaTkin;
  G4ThreeVector dir = totalMomentum*direction - deltaTotalMomentum*deltaDirection;
  direction = dir.unit();
  fParticleChange->SetProposedKineticEnergy(kineticEnergy);
  fParticleChange->SetProposedMomentumDirection(direction);
 
  // create G4DynamicParticle object for e- delta ray 
  G4DynamicParticle* deltaRay = new G4DynamicParticle;
  deltaRay->SetDefinition(G4Electron::Electron());
  deltaRay->SetKineticEnergy( deltaTkin );  //  !!! trick for last steps /2.0 ???
  deltaRay->SetMomentumDirection(deltaDirection); 
 
  vdp->push_back(deltaRay);
}

◆ SetVerboseLevel()

void G4PAIModel::SetVerboseLevel ( G4int verbose )

inline

Definition at line 120 of file G4PAIModel.hh.

120{fVerbose=verbose;};

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

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4PAIModel()

◆ ~G4PAIModel()

Member Function Documentation

◆ BuildLambdaVector()

◆ BuildPAIonisationTable()

◆ ComputeDEDXPerVolume()

◆ ComputeSandiaPhotoAbsCof()

◆ CrossSectionPerVolume()

◆ DefineForRegion()

◆ Dispersion()

◆ GetdEdxCut()

◆ GetdNdxCut()

◆ GetEnergyTransfer()

◆ GetPostStepTransfer()

◆ Initialise()

◆ InitialiseMe()

◆ MaxSecondaryEnergy()

◆ SampleFluctuations()

◆ SampleSecondaries()

◆ SetVerboseLevel()