G4GammaConversion.cc

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// 
//------------------ G4GammaConversion physics process -------------------------
//                   by Michel Maire, 24 May 1996
//
// Modified by Michel Maire and Vladimir Ivanchenko
//
// -----------------------------------------------------------------------------

#include "G4GammaConversion.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4PairProductionRelModel.hh"
#include "G4Electron.hh"
#include "G4EmParameters.hh"

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using namespace std;

G4GammaConversion::G4GammaConversion(const G4String& processName,
  G4ProcessType type):G4VEmProcess (processName, type),
    isInitialised(false)
{
  SetMinKinEnergy(2.0*electron_mass_c2);
  SetProcessSubType(fGammaConversion);
  SetStartFromNullFlag(true);
  SetBuildTableFlag(true);
  SetSecondaryParticle(G4Electron::Electron());
  SetLambdaBinning(220);
}

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G4GammaConversion::~G4GammaConversion()
{}

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G4bool G4GammaConversion::IsApplicable(const G4ParticleDefinition& p)
{
  return (&p == G4Gamma::Gamma());
}

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void G4GammaConversion::InitialiseProcess(const G4ParticleDefinition*)
{
  if(!isInitialised) {
    isInitialised = true;
    G4EmParameters* param = G4EmParameters::Instance();
    G4double emin = std::max(param->MinKinEnergy(), 2*electron_mass_c2);
    G4double emax = param->MaxKinEnergy();

    SetMinKinEnergy(emin);

    if(!EmModel(0)) { SetEmModel(new G4PairProductionRelModel()); }
    EmModel(0)->SetLowEnergyLimit(emin);
    EmModel(0)->SetHighEnergyLimit(emax);
    AddEmModel(1, EmModel(0));
  } 
}

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G4double G4GammaConversion::MinPrimaryEnergy(const G4ParticleDefinition*,
               const G4Material*)
{
  return 2*electron_mass_c2;
}

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void G4GammaConversion::PrintInfo()
{}         

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void G4GammaConversion::ProcessDescription(std::ostream& out) const
{
  out << "  Gamma conversion";
  G4VEmProcess::ProcessDescription(out);
}

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