G4PAIModel Class Reference

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

---

Detailed Description

Definition at line 67 of file G4PAIModel.hh.

---

Constructor & Destructor Documentation

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

Definition at line 74 of file G4PAIModel.cc.

References G4Electron::Electron(), and G4Positron::Positron().

  : 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

(

)

[virtual]

Definition at line 112 of file G4PAIModel.cc.

References G4PhysicsTable::clearAndDestroy().

{
  //  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

void G4PAIModel::BuildLambdaVector

(

)

Definition at line 346 of file G4PAIModel.cc.

References DBL_MAX, G4cout, G4endl, GetdNdxCut(), G4InuclParticleNames::lambda, and G4PhysicsVector::PutValue().

Referenced by Initialise().

{
  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) ;
  }
}

void G4PAIModel::BuildPAIonisationTable

(

)

Definition at line 282 of file G4PAIModel.cc.

References DBL_MIN, G4PAIySection::GetIntegralPAIdEdx(), G4PAIySection::GetIntegralPAIySection(), G4PhysicsVector::GetLowEdgeEnergy(), G4PAIySection::GetMeanEnergyLoss(), G4SandiaTable::GetSandiaCofForMaterialPAI(), G4Material::GetSandiaTable(), G4PAIySection::GetSplineEnergy(), G4PAIySection::GetSplineSize(), G4PAIySection::Initialize(), G4PhysicsTable::insertAt(), MaxSecondaryEnergy(), CLHEP::detail::n, G4PhysicsVector::PutValue(), and G4PhysicsFreeVector::PutValue().

Referenced by Initialise().

{
  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
}

G4double G4PAIModel::ComputeDEDXPerVolume	(	const G4Material *	,
		const G4ParticleDefinition *	,
		G4double	kineticEnergy,
		G4double	cutEnergy
	)			[virtual]

Reimplemented from G4VEmModel.

Definition at line 468 of file G4PAIModel.cc.

References G4VEmModel::CurrentCouple(), GetdEdxCut(), G4ParticleDefinition::GetPDGCharge(), and G4ParticleDefinition::GetPDGMass().

{
  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;
}

void G4PAIModel::ComputeSandiaPhotoAbsCof

(

)

Definition at line 232 of file G4PAIModel.cc.

References G4Material::GetMaterialTable(), G4SandiaTable::GetPhotoAbsorpCof(), G4SandiaTable::SandiaIntervals(), and G4SandiaTable::SandiaMixing().

{ 
  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;
}

G4double G4PAIModel::CrossSectionPerVolume	(	const G4Material *	,
		const G4ParticleDefinition *	,
		G4double	kineticEnergy,
		G4double	cutEnergy,
		G4double	maxEnergy
	)			[virtual]

Reimplemented from G4VEmModel.

Definition at line 514 of file G4PAIModel.cc.

References G4VEmModel::CurrentCouple(), DBL_MIN, GetdNdxCut(), G4ParticleDefinition::GetPDGCharge(), G4ParticleDefinition::GetPDGMass(), and MaxSecondaryEnergy().

{
  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;
}

void G4PAIModel::DefineForRegion

(

const G4Region *

r

)

[virtual]

Reimplemented from G4VEmModel.

Definition at line 994 of file G4PAIModel.cc.

{
  fPAIRegionVector.push_back(r);
}

G4double G4PAIModel::Dispersion	(	const G4Material *	,
		const G4DynamicParticle *	,
		G4double &	,
		G4double &
	)			[virtual]

Implements G4VEmFluctuationModel.

Definition at line 958 of file G4PAIModel.cc.

References SampleFluctuations().

{
  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;
}

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

Definition at line 424 of file G4PAIModel.cc.

Referenced by ComputeDEDXPerVolume().

{ 
  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 ;
}

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

Definition at line 378 of file G4PAIModel.cc.

Referenced by BuildLambdaVector(), and CrossSectionPerVolume().

{ 
  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 ;
}

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

Definition at line 737 of file G4PAIModel.cc.

References G4UniformRand.

Referenced by GetPostStepTransfer(), and SampleFluctuations().

{ 
  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;
}

G4double G4PAIModel::GetPostStepTransfer

(

G4double

scaledTkin

)

Definition at line 649 of file G4PAIModel.cc.

References G4UniformRand, GetEnergyTransfer(), G4PhysicsVector::GetLowEdgeEnergy(), and position.

Referenced by SampleSecondaries().

{  
  // 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 ;
}

void G4PAIModel::Initialise	(	const G4ParticleDefinition *	,
		const G4DataVector &
	)			[virtual]

Implements G4VEmModel.

Definition at line 160 of file G4PAIModel.cc.

References BuildLambdaVector(), BuildPAIonisationTable(), G4cout, G4endl, G4ProductionCutsTable::GetEnergyCutsVector(), G4ProductionCutsTable::GetMaterialCutsCouple(), G4Material::GetMaterialTable(), G4Material::GetNumberOfMaterials(), G4VEmModel::GetParticleChangeForLoss(), G4ParticleDefinition::GetParticleName(), G4ProductionCutsTable::GetProductionCutsTable(), and G4PAIySection::SetVerbose().

{
  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);
      }
    }
  }
}

void G4PAIModel::InitialiseMe

(

const G4ParticleDefinition *

)

[virtual]

Reimplemented from G4VEmFluctuationModel.

Definition at line 227 of file G4PAIModel.cc.

{}

G4double G4PAIModel::MaxSecondaryEnergy	(	const G4ParticleDefinition *	,
		G4double	kinEnergy
	)			[protected, virtual]

Reimplemented from G4VEmModel.

Definition at line 977 of file G4PAIModel.cc.

References G4ParticleDefinition::GetPDGMass().

Referenced by BuildPAIonisationTable(), and CrossSectionPerVolume().

{
  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;
}

G4double G4PAIModel::SampleFluctuations	(	const G4Material *	,
		const G4DynamicParticle *	,
		G4double &	,
		G4double &	,
		G4double &
	)			[virtual]

Implements G4VEmFluctuationModel.

Definition at line 773 of file G4PAIModel.cc.

References DBL_MAX, G4UniformRand, G4DynamicParticle::GetDefinition(), GetEnergyTransfer(), G4DynamicParticle::GetKineticEnergy(), G4PhysicsVector::GetLowEdgeEnergy(), G4ParticleDefinition::GetPDGCharge(), G4ParticleDefinition::GetPDGMass(), G4InuclParticleNames::lambda, and position.

Referenced by Dispersion().

{
  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 ;

}

void G4PAIModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	,
		const G4MaterialCutsCouple *	,
		const G4DynamicParticle *	,
		G4double	tmin,
		G4double	maxEnergy
	)			[virtual]

Implements G4VEmModel.

Definition at line 566 of file G4PAIModel.cc.

References G4Electron::Electron(), G4cout, G4endl, G4UniformRand, G4DynamicParticle::GetKineticEnergy(), G4DynamicParticle::GetMass(), G4DynamicParticle::GetMomentumDirection(), GetPostStepTransfer(), G4VEmModel::MaxSecondaryKinEnergy(), G4DynamicParticle::SetDefinition(), G4DynamicParticle::SetKineticEnergy(), G4DynamicParticle::SetMomentumDirection(), G4ParticleChangeForLoss::SetProposedKineticEnergy(), and G4ParticleChangeForLoss::SetProposedMomentumDirection().

{
  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);
}

void G4PAIModel::SetVerboseLevel

(

G4int

verbose

)

[inline]

Definition at line 120 of file G4PAIModel.hh.

{fVerbose=verbose;};

---

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

• G4PAIModel.hh
• G4PAIModel.cc

---