G4DNAElastic.cc

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// add elastic scattering processes of proton, hydrogen, helium, alpha+, alpha++
 
#include "G4DNAElastic.hh"
#include "G4SystemOfUnits.hh"
#include "G4Positron.hh"
#include "G4LowEnergyEmProcessSubType.hh"
 
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using namespace std;
 
G4DNAElastic::G4DNAElastic(const G4String& processName, G4ProcessType type) :
    G4VEmProcess(processName, type), isInitialised(false)
{
  SetProcessSubType(fLowEnergyElastic);
}
 
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G4DNAElastic::~G4DNAElastic()
{
}
 
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G4bool G4DNAElastic::IsApplicable(const G4ParticleDefinition& p)
{
  G4DNAGenericIonsManager *instance;
  instance = G4DNAGenericIonsManager::Instance();
 
  return (&p == G4Electron::Electron() || &p == G4Positron::Positron()
          || &p == G4Proton::Proton() || &p == instance->GetIon("hydrogen")
          || &p == instance->GetIon("alpha++")
          || &p == instance->GetIon("alpha+")
          || &p == instance->GetIon("helium"));
 
}
 
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void G4DNAElastic::InitialiseProcess(const G4ParticleDefinition* p)
{
  if(!isInitialised)
  {
    isInitialised = true;
    SetBuildTableFlag(false);
 
    G4String name = p->GetParticleName();
 
    if(name == "e-")
    {
      if(!EmModel())
      {
        SetEmModel(new G4DNAScreenedRutherfordElasticModel);
        EmModel()->SetLowEnergyLimit(0 * eV);
        EmModel()->SetHighEnergyLimit(1. * MeV);
      }
      AddEmModel(1, EmModel());
    }
 
    else if(name == "proton" || name == "hydrogen")
    {
      if(!EmModel())
      {
        SetEmModel(new G4DNAIonElasticModel);
        EmModel()->SetLowEnergyLimit(0 * eV);
        EmModel()->SetHighEnergyLimit(1 * MeV);
      }
      AddEmModel(1, EmModel());
    }
 
    // "alpha" must be explicitly used, not alpha++
    else if(name == "helium" || name == "alpha" || name == "alpha+")
    {
      if(!EmModel())
      {
        SetEmModel(new G4DNAIonElasticModel);
        EmModel()->SetLowEnergyLimit(0 * eV);
        EmModel()->SetHighEnergyLimit(1 * MeV);
      }
      AddEmModel(1, EmModel());
    }
  }
}
 
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void G4DNAElastic::PrintInfo()
{
  G4cout << " Total cross sections computed from " << EmModel()->GetName()
         << " model" << G4endl;
}
 
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