source: trunk/source/processes/electromagnetic/lowenergy/src/G4eIonisationCrossSectionHandler.cc @ 1337

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// $Id: G4eIonisationCrossSectionHandler.cc,v 1.15 2009/09/27 10:47:42 sincerti Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4eIonisationCrossSectionHandler
//
// Author:        V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
// 
// Creation date: 25 Sept 2001
//
// Modifications: 
// 10 Oct 2001  M.G. Pia     Revision to improve code quality and consistency with design
// 19 Jul 2002   VI          Create composite data set for material
// 21 Jan 2003  V.Ivanchenko Cut per region
// 28 Jan 2009  L.Pandola    Added public method to make a easier migration of 
//                           G4LowEnergyIonisation to G4LivermoreIonisationModel
// 15 Jul 2009   Nicolas A. Karakatsanis
//
//                           - BuildCrossSectionForMaterials method was revised in order to calculate the 
//                             logarithmic values of the loaded data. 
//                             It retrieves the data values from the G4EMLOW data files but, then, calculates the
//                             respective log values and loads them to seperate data structures.
//                             The EM data sets, initialized this way, contain both non-log and log values.
//                             These initialized data sets can enhance the computing performance of data interpolation
//                             operations
//
//
//
// -------------------------------------------------------------------

#include "G4eIonisationCrossSectionHandler.hh"
#include "G4VEnergySpectrum.hh"
#include "G4DataVector.hh"
#include "G4CompositeEMDataSet.hh"
#include "G4VDataSetAlgorithm.hh"
#include "G4LinLogLogInterpolation.hh"
#include "G4SemiLogInterpolation.hh"
#include "G4VEMDataSet.hh"
#include "G4EMDataSet.hh"
#include "G4Material.hh"
#include "G4ProductionCutsTable.hh"


G4eIonisationCrossSectionHandler::G4eIonisationCrossSectionHandler(
    const G4VEnergySpectrum* spec, G4VDataSetAlgorithm* alg,
    G4double emin, G4double emax, G4int nbin)
 :  G4VCrossSectionHandler(),
    theParam(spec)
{
  G4VCrossSectionHandler::Initialise(alg, emin, emax, nbin);
  interp = new G4LinLogLogInterpolation();
}


G4eIonisationCrossSectionHandler::~G4eIonisationCrossSectionHandler()
{
  delete interp;
}


std::vector<G4VEMDataSet*>* G4eIonisationCrossSectionHandler::BuildCrossSectionsForMaterials(
                        const G4DataVector& energyVector,
                        const G4DataVector* energyCuts)
{
  G4int verbose = 0;
  std::vector<G4VEMDataSet*>* set = new std::vector<G4VEMDataSet*>;

  G4DataVector* energies;
  G4DataVector* cs;

  G4DataVector* log_energies;
  G4DataVector* log_cs;

  G4int nOfBins = energyVector.size();

  const G4ProductionCutsTable* theCoupleTable=
        G4ProductionCutsTable::GetProductionCutsTable();
  size_t numOfCouples = theCoupleTable->GetTableSize();

  for (size_t m=0; m<numOfCouples; m++) {

    const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(m);
    const G4Material* material= couple->GetMaterial();
    const G4ElementVector* elementVector = material->GetElementVector();
    const G4double* nAtomsPerVolume = material->GetAtomicNumDensityVector();
    G4int nElements = material->GetNumberOfElements();

    if(verbose > 0) 
      {
        G4cout << "eIonisation CS for " << m << "th material "
               << material->GetName()
               << "  eEl= " << nElements << G4endl;
      }

    G4double tcut  = (*energyCuts)[m];

    G4VDataSetAlgorithm* algo = interp->Clone();
    G4VEMDataSet* setForMat = new G4CompositeEMDataSet(algo,1.,1.);

    for (G4int i=0; i<nElements; i++) {

      G4int Z = (G4int) (*elementVector)[i]->GetZ();
      G4int nShells = NumberOfComponents(Z);

      energies = new G4DataVector;
      cs       = new G4DataVector;

      log_energies = new G4DataVector;
      log_cs       = new G4DataVector;

      G4double density = nAtomsPerVolume[i];

      for (G4int bin=0; bin<nOfBins; bin++) {

        G4double e = energyVector[bin];
        energies->push_back(e);
        log_energies->push_back(std::log10(e));
        G4double value = 0.0;
        G4double log_value = -300;

        if(e > tcut) {
          for (G4int n=0; n<nShells; n++) {
            G4double cross = FindValue(Z, e, n);
            G4double p = theParam->Probability(Z, tcut, e, e, n);
            value += cross * p * density;

            if(verbose>0 && m == 0 && e>=1. && e<=0.) 
            {
              G4cout << "G4eIonCrossSH: e(MeV)= " << e/MeV
                     << " n= " << n
                     << " cross= " << cross
                     << " p= " << p
                     << " value= " << value
                     << " tcut(MeV)= " << tcut/MeV
                     << " rho= " << density
                     << " Z= " << Z
                     << G4endl;
              }

          }
          if (value == 0.) value = 1e-300;
          log_value = std::log10(value);
        }
        cs->push_back(value);
        log_cs->push_back(log_value);
      }
      G4VDataSetAlgorithm* algo = interp->Clone();

      //G4VEMDataSet* elSet = new G4EMDataSet(i,energies,cs,algo,1.,1.);

      G4VEMDataSet* elSet = new G4EMDataSet(i,energies,cs,log_energies,log_cs,algo,1.,1.);

      setForMat->AddComponent(elSet);
    }
    set->push_back(setForMat);
  }

  return set;
}

G4double G4eIonisationCrossSectionHandler::GetCrossSectionAboveThresholdForElement(G4double energy,
                                                                                   G4double cutEnergy,
                                                                                   G4int Z)
{
  G4int nShells = NumberOfComponents(Z);
  G4double value = 0.;
  if(energy > cutEnergy) 
    {
      for (G4int n=0; n<nShells; n++) {
        G4double cross = FindValue(Z, energy, n);
        G4double p = theParam->Probability(Z, cutEnergy, energy, energy, n);
        value += cross * p;
      }
    }
  return value;
}