source: trunk/source/processes/electromagnetic/lowenergy/src/G4CrossSectionElasticChampion.cc @ 989

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// $Id: G4CrossSectionElasticChampion.cc,v 1.4 2008/12/05 11:58:16 sincerti Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
// -------------------------------------------------------------------

#include "G4CrossSectionElasticChampion.hh"

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G4CrossSectionElasticChampion::G4CrossSectionElasticChampion()
{
  lowEnergyLimit = 0.*eV; 
  highEnergyLimit = 10. * keV;

  G4double scaleFactor = 1e-16*cm*cm;

  G4String fileElectron("dna/sigma_elastic_e_champion");

  G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
  G4String electron;
  
  if (electronDef != 0)
  {
    electron = electronDef->GetParticleName();
    tableFile[electron] = fileElectron;

    G4DNACrossSectionDataSet* tableE = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
    tableE->LoadData(fileElectron);
    tableData[electron] = tableE;
  }
  else
  {
    G4Exception("G4CrossSectionElasticChampion constructor: electron is not defined");
  }
}

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G4CrossSectionElasticChampion::~G4CrossSectionElasticChampion()
{
  std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
  for (pos = tableData.begin(); pos != tableData.end(); ++pos)
  {
    G4DNACrossSectionDataSet* table = pos->second;
    delete table;
  }
}

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G4double G4CrossSectionElasticChampion::CrossSection(const G4Track& track )
{
  const G4DynamicParticle* particle = track.GetDynamicParticle();
  G4double k = particle->GetKineticEnergy();
  
  G4double sigma = 0.;

  const G4String& particleName = particle->GetDefinition()->GetParticleName();
 
  if (k >= lowEnergyLimit && k < highEnergyLimit)
  {
        std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
        pos = tableData.find(particleName);
        
        if (pos != tableData.end())
        {
          G4DNACrossSectionDataSet* table = pos->second;
          if (table != 0)
          {
            sigma = table->FindValue(k);
          }
        }
        else
        {
            G4Exception("G4CrossSectionElasticChampion::CrossSection: attempting to calculate cross section for wrong particle");
        }
  }
  return sigma;
}