source: trunk/source/processes/electromagnetic/lowenergy/src/G4CrossSectionIonisationBorn.cc@ 1005

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// $Id: G4CrossSectionIonisationBorn.cc,v 1.4 2008/08/20 14:51:48 sincerti Exp $
// GEANT4 tag $Name: geant4-09-02 $

#include "G4CrossSectionIonisationBorn.hh"

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G4CrossSectionIonisationBorn::G4CrossSectionIonisationBorn()
{
  lowEnergyLimitDefault = 12.61 * eV; // SI: i/o 25 eV
  highEnergyLimitDefault = 30 * keV;

  G4String fileElectron("dna/sigma_ionisation_e_born");
  G4String fileProton("dna/sigma_ionisation_p_born");

  G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
  G4ParticleDefinition* protonDef = G4Proton::ProtonDefinition();

  G4String electron;
  G4String proton;
  
  G4double scaleFactor = (1.e-22 / 3.343) * m*m;

  if (electronDef != 0)
  {
    electron = electronDef->GetParticleName();
    tableFile[electron] = fileElectron;

    lowEnergyLimit[electron] = 12.61 * eV; // SI: i/o 25 eV
    highEnergyLimit[electron] = 30. * keV;

    G4DNACrossSectionDataSet* tableE = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
    tableE->LoadData(fileElectron);
      
    tableData[electron] = tableE;
  }
  else
  {
    G4Exception("G4CrossSectionIonisationBorn Constructor: electron is not defined");
  }

  if (protonDef != 0)
  {
    proton = protonDef->GetParticleName();
    tableFile[proton] = fileProton;

    lowEnergyLimit[proton] = 500. * keV;
    highEnergyLimit[proton] = 10. * MeV;

    G4DNACrossSectionDataSet* tableP = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
    tableP->LoadData(fileProton);
      
    tableData[proton] = tableP;
  }
  else
  {
    G4Exception("G4CrossSectionIonisationBorn Constructor: proton is not defined");
  }
}

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G4CrossSectionIonisationBorn::~G4CrossSectionIonisationBorn()
{
  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 G4CrossSectionIonisationBorn::CrossSection(const G4Track& track )
{
  const G4DynamicParticle* particle = track.GetDynamicParticle();
  G4double k = particle->GetKineticEnergy();
  
  G4double sigma = 0.;

  G4double lowLim = lowEnergyLimitDefault;
  G4double highLim = highEnergyLimitDefault;

  const G4String& particleName = particle->GetDefinition()->GetParticleName();

  std::map< G4String,G4double,std::less<G4String> >::iterator pos1;
  pos1 = lowEnergyLimit.find(particleName);

  if (pos1 != lowEnergyLimit.end())
  {
    lowLim = pos1->second;
  }

  std::map< G4String,G4double,std::less<G4String> >::iterator pos2;
  pos2 = highEnergyLimit.find(particleName);

  if (pos2 != highEnergyLimit.end())
  {
    highLim = pos2->second;
  }

  if (k > lowLim && k < highLim)
  {
    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("G4CrossSectionIonisationBorn: attempting to calculate cross section for wrong particle");
    }
  }

  return sigma;
}