G4VEmModel.cc

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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4VEmModel
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 25.07.2005
//
// Modifications:
// 25.10.2005 Set default highLimit=100.TeV (V.Ivanchenko)
// 06.02.2006 add method ComputeMeanFreePath() (mma)
// 16.02.2009 Move implementations of virtual methods to source (VI)
//
//
// Class Description:
//
// Abstract interface to energy loss models
 
// -------------------------------------------------------------------
//
 
#include "G4VEmModel.hh"
#include "G4ElementData.hh"
#include "G4LossTableManager.hh"
#include "G4LossTableBuilder.hh"
#include "G4ProductionCutsTable.hh"
#include "G4ParticleChangeForLoss.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4EmParameters.hh"
#include "G4SystemOfUnits.hh"
#include "G4EmUtility.hh"
#include "G4Log.hh"
#include "Randomize.hh"
#include <iostream>
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4VEmModel::G4VEmModel(const G4String& nam):
  inveplus(1.0/CLHEP::eplus),
  lowLimit(0.1*CLHEP::keV), 
  highLimit(100.0*CLHEP::TeV),
  polarAngleLimit(CLHEP::pi),
  name(nam)
{
  xsec.resize(nsec);
  fEmManager = G4LossTableManager::Instance();
  fEmManager->Register(this);
 
  G4LossTableBuilder* bld = fEmManager->GetTableBuilder();
  theDensityFactor = bld->GetDensityFactors();
  theDensityIdx = bld->GetCoupleIndexes();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4VEmModel::~G4VEmModel()
{
  if(localElmSelectors) { 
    for(G4int i=0; i<nSelectors; ++i) { 
      delete (*elmSelectors)[i]; 
    }
    delete elmSelectors; 
  }
  delete anglModel;
  
  if(localTable && xSectionTable != nullptr) { 
    xSectionTable->clearAndDestroy();
    delete xSectionTable;
    xSectionTable = nullptr; 
  }
  fEmManager->DeRegister(this);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4ParticleChangeForLoss* G4VEmModel::GetParticleChangeForLoss()
{
  G4ParticleChangeForLoss* p = nullptr;
  if (pParticleChange != nullptr) {
    p = static_cast<G4ParticleChangeForLoss*>(pParticleChange);
  } else {
    p = new G4ParticleChangeForLoss();
    pParticleChange = p;
  }
  if(fTripletModel != nullptr) { fTripletModel->SetParticleChange(p); }
  return p;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4ParticleChangeForGamma* G4VEmModel::GetParticleChangeForGamma()
{
  G4ParticleChangeForGamma* p = nullptr;
  if (pParticleChange != nullptr) {
    p = static_cast<G4ParticleChangeForGamma*>(pParticleChange);
  } else {
    p = new G4ParticleChangeForGamma();
    pParticleChange = p;
  }
  if(fTripletModel != nullptr) { fTripletModel->SetParticleChange(p); }
  return p;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::InitialiseElementSelectors(const G4ParticleDefinition* part, 
                                            const G4DataVector& cuts)
{
  if(highLimit <= lowLimit) { return; }
  G4EmUtility::InitialiseElementSelectors(this,part,cuts,lowLimit,highLimit);
  localElmSelectors = true;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::InitialiseLocal(const G4ParticleDefinition*, G4VEmModel*)
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::InitialiseForMaterial(const G4ParticleDefinition* part,
                                       const G4Material* material)
{
  if(material != nullptr) {
    G4int n = (G4int)material->GetNumberOfElements();
    for(G4int i=0; i<n; ++i) {
      G4int Z = material->GetElement(i)->GetZasInt();
      InitialiseForElement(part, Z);
    }
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::InitialiseForElement(const G4ParticleDefinition*, G4int)
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::ComputeDEDXPerVolume(const G4Material*,
                                          const G4ParticleDefinition*,
                                          G4double,G4double)
{
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::CrossSectionPerVolume(const G4Material* mat,
                                           const G4ParticleDefinition* p,
                                           G4double ekin,
                                           G4double emin,
                                           G4double emax)
{
  SetupForMaterial(p, mat, ekin);
  const G4double* theAtomNumDensityVector = mat->GetVecNbOfAtomsPerVolume();
  G4int nelm = (G4int)mat->GetNumberOfElements(); 
  if(nelm > nsec) {
    xsec.resize(nelm);
    nsec = nelm;
  }
  G4double cross = 0.0;
  for (G4int i=0; i<nelm; ++i) {
    cross += theAtomNumDensityVector[i]*
      ComputeCrossSectionPerAtom(p,mat->GetElement(i),ekin,emin,emax);
    xsec[i] = cross;
  }
  return cross;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::GetPartialCrossSection(const G4Material*, G4int,
                                            const G4ParticleDefinition*,
                                            G4double)
{ 
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::StartTracking(G4Track*)
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
const G4Element* G4VEmModel::SelectRandomAtom(const G4Material* mat,
                                              const G4ParticleDefinition* pd,
                                              G4double kinEnergy,
                                              G4double tcut,
                                              G4double tmax)
{
  G4int n = (G4int)mat->GetNumberOfElements();
  fCurrentElement = mat->GetElement(0);
  if (n > 1) {
    const G4double x = G4UniformRand()*
      G4VEmModel::CrossSectionPerVolume(mat,pd,kinEnergy,tcut,tmax);
    for(G4int i=0; i<n; ++i) {
      if (x <= xsec[i]) {
        fCurrentElement = mat->GetElement(i);
        break;
      }
    }
  }
  return fCurrentElement;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
const G4Element* G4VEmModel::GetCurrentElement(const G4Material* mat) const
{
  const G4Element* elm = fCurrentElement;
  if(nullptr == elm && nullptr != mat) {
    elm = G4EmUtility::SampleRandomElement(mat);
  }
  return elm;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4int G4VEmModel::SelectRandomAtomNumber(const G4Material* mat) const
{
  const G4Element* elm = GetCurrentElement(mat);
  return (nullptr == elm) ? 0 : elm->GetZasInt();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
const G4Isotope* G4VEmModel::GetCurrentIsotope(const G4Element* elm) const
{
  const G4Isotope* iso = nullptr;
  const G4Element* el = elm;
  if(nullptr == el && nullptr != fCurrentCouple) { 
    el = GetCurrentElement(fCurrentCouple->GetMaterial());
  }
  if(nullptr != el) {
    iso = G4EmUtility::SampleRandomIsotope(el);
  }
  return iso;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4int G4VEmModel::SelectIsotopeNumber(const G4Element* elm) const
{
  auto iso = GetCurrentIsotope(elm);
  return (nullptr != iso) ? iso->GetN() : 0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
                                                G4double, G4double, G4double,
                                                G4double, G4double)
{
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double 
G4VEmModel::ComputeCrossSectionPerShell(const G4ParticleDefinition*,
                                        G4int, G4int, 
                                        G4double, G4double, G4double)
{
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::DefineForRegion(const G4Region*) 
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::FillNumberOfSecondaries(G4int& numberOfTriplets,
                                         G4int& numberOfRecoil)
{
  numberOfTriplets = 0;
  numberOfRecoil = 0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::ChargeSquareRatio(const G4Track& track)
{
  return GetChargeSquareRatio(track.GetParticleDefinition(), 
                              track.GetMaterial(), track.GetKineticEnergy());
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::GetChargeSquareRatio(const G4ParticleDefinition* p,
                                          const G4Material*, G4double)
{
  const G4double q = p->GetPDGCharge()*inveplus;
  return q*q;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::GetParticleCharge(const G4ParticleDefinition* p,
                                       const G4Material*, G4double)
{
  return p->GetPDGCharge();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::CorrectionsAlongStep(const G4MaterialCutsCouple*,
                                      const G4DynamicParticle*,
                                      const G4double&,G4double&)
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::Value(const G4MaterialCutsCouple* couple,
                           const G4ParticleDefinition* p, G4double e)
{
  SetCurrentCouple(couple);
  return pFactor*e*e*CrossSectionPerVolume(pBaseMaterial,p,e,0.0,DBL_MAX);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::MinPrimaryEnergy(const G4Material*,
                                      const G4ParticleDefinition*,
                                      G4double)
{
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::MinEnergyCut(const G4ParticleDefinition*, 
                                  const G4MaterialCutsCouple*)
{
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4VEmModel::MaxSecondaryEnergy(const G4ParticleDefinition*,
                                        G4double kineticEnergy)
{
  return kineticEnergy;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::SetupForMaterial(const G4ParticleDefinition* p,
                                  const G4Material* mat, G4double ekin)
{
  GetChargeSquareRatio(p, mat, ekin);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void 
G4VEmModel::SetParticleChange(G4VParticleChange* p, G4VEmFluctuationModel* f)
{
  if(p != nullptr && pParticleChange != p) { pParticleChange = p; }
  if(flucModel != f) { flucModel = f; }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4VEmModel::SetCrossSectionTable(G4PhysicsTable* p, G4bool isLocal)
{
  if(p != xSectionTable) {
    if(xSectionTable != nullptr && localTable) { 
      xSectionTable->clearAndDestroy(); 
      delete xSectionTable;
    }
    xSectionTable = p;
  }
  localTable = isLocal;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmModel::SetLPMFlag(G4bool)
{
  if (G4EmParameters::Instance()->Verbose() > 0) {
    G4ExceptionDescription ed;
    ed << "The obsolete method SetLPMFlag(..) of the model class " << GetName() 
       << " is called. Please, use G4EmParameters::Instance()->SetLPM(..)"
       << " instead";
    G4Exception("G4VEmModel::SetLPMFlag", "em0001", JustWarning, ed);
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void  G4VEmModel::ModelDescription(std::ostream& outFile) const
{
  outFile << "The description for this model has not been written yet.\n";
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......