G4eeToHadronsMultiModel.cc

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// $Id: G4eeToHadronsMultiModel.cc 66996 2013-01-29 14:50:52Z gcosmo $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4eeToHadronsMultiModel
//
// Author:        Vladimir Ivanchenko 
//
// Creation date: 02.08.2004
//
// Modifications:
// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
//

//
// -------------------------------------------------------------------
//
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#include "G4eeToHadronsMultiModel.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4eeToTwoPiModel.hh"
#include "G4eeTo3PiModel.hh"
#include "G4eeToPGammaModel.hh"
#include "G4ee2KNeutralModel.hh"
#include "G4ee2KChargedModel.hh"
#include "G4eeCrossSections.hh"
#include "G4Vee2hadrons.hh"

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using namespace std;

G4eeToHadronsMultiModel::G4eeToHadronsMultiModel(G4int ver, const G4String& mname)
  : G4VEmModel(mname),
    csFactor(1.0),
    nModels(0),
    verbose(ver),
    isInitialised(false)
{
  thKineticEnergy  = DBL_MAX;
  maxKineticEnergy = 1.2*GeV;
  fParticleChange  = 0;
  cross = 0;
}

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G4eeToHadronsMultiModel::~G4eeToHadronsMultiModel()
{
  G4int n = models.size();
  if(n>0) {
    for(G4int i=0; i<n; i++) {
      delete models[i];
    }
  }
  delete cross;
}

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void G4eeToHadronsMultiModel::Initialise(const G4ParticleDefinition*, 
                                         const G4DataVector&)
{
  if(!isInitialised) {
    isInitialised = true;

    cross = new G4eeCrossSections();

    G4eeToTwoPiModel* m2pi = new G4eeToTwoPiModel(cross);
    m2pi->SetHighEnergy(maxKineticEnergy);
    AddEEModel(m2pi);

    G4eeTo3PiModel* m3pi1 = new G4eeTo3PiModel(cross);
    m3pi1->SetHighEnergy(0.95*GeV);
    AddEEModel(m3pi1);

    G4eeTo3PiModel* m3pi2 = new G4eeTo3PiModel(cross);
    m3pi2->SetLowEnergy(0.95*GeV);
    m3pi2->SetHighEnergy(maxKineticEnergy);
    AddEEModel(m3pi2);

    G4ee2KChargedModel* m2kc = new G4ee2KChargedModel(cross);
    m2kc->SetHighEnergy(maxKineticEnergy);
    AddEEModel(m2kc);

    G4ee2KNeutralModel* m2kn = new G4ee2KNeutralModel(cross);
    m2kn->SetHighEnergy(maxKineticEnergy);
    AddEEModel(m2kn);

    G4eeToPGammaModel* mpg1 = new G4eeToPGammaModel(cross,"pi0");
    mpg1->SetLowEnergy(0.7*GeV);
    mpg1->SetHighEnergy(maxKineticEnergy);
    AddEEModel(mpg1);

    G4eeToPGammaModel* mpg2 = new G4eeToPGammaModel(cross,"eta");
    mpg2->SetLowEnergy(0.7*GeV);
    mpg2->SetHighEnergy(maxKineticEnergy);
    AddEEModel(mpg2);

    nModels = models.size();

    fParticleChange = GetParticleChangeForGamma();
  }
}

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void G4eeToHadronsMultiModel::AddEEModel(G4Vee2hadrons* mod)
{
  G4eeToHadronsModel* model = new G4eeToHadronsModel(mod, verbose);
  model->SetLowEnergyLimit(LowEnergyLimit());
  model->SetHighEnergyLimit(HighEnergyLimit());
  models.push_back(model);
  G4double elow = mod->ThresholdEnergy();
  ekinMin.push_back(elow);
  if(thKineticEnergy > elow) thKineticEnergy = elow;
  ekinMax.push_back(mod->HighEnergy());
  ekinPeak.push_back(mod->PeakEnergy());
  cumSum.push_back(0.0);
}

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G4double G4eeToHadronsMultiModel::CrossSectionPerVolume(
                                      const G4Material* mat,
                                      const G4ParticleDefinition* p,
                                      G4double kineticEnergy,
                                      G4double, G4double)
{
  return mat->GetElectronDensity()*
    ComputeCrossSectionPerElectron(p, kineticEnergy);
}

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G4double G4eeToHadronsMultiModel::ComputeCrossSectionPerAtom(
                                      const G4ParticleDefinition* p,
                                      G4double kineticEnergy,
                                      G4double Z, G4double,
                                      G4double, G4double)
{
  return Z*ComputeCrossSectionPerElectron(p, kineticEnergy);
}


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void G4eeToHadronsMultiModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
                                                const G4MaterialCutsCouple* couple,
                                                const G4DynamicParticle* dp,
                                                G4double, G4double)
{
  G4double kinEnergy = dp->GetKineticEnergy();
  if (kinEnergy > thKineticEnergy) {
    G4double q = cumSum[nModels-1]*G4UniformRand();
    for(G4int i=0; i<nModels; i++) {
      if(q <= cumSum[i]) {
        (models[i])->SampleSecondaries(newp, couple,dp);
        if(newp->size() > 0) fParticleChange->ProposeTrackStatus(fStopAndKill);
        break;
      }
    }
  }
}

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void G4eeToHadronsMultiModel::PrintInfo()
{
  if(verbose > 0) {
    G4double e1 = 0.5*thKineticEnergy*thKineticEnergy/electron_mass_c2 
      - 2.0*electron_mass_c2; 
    G4double e2 = 0.5*maxKineticEnergy*maxKineticEnergy/electron_mass_c2 
      - 2.0*electron_mass_c2; 
    G4cout << "      e+ annihilation into hadrons active from "
           << e1/GeV << " GeV to " << e2/GeV << " GeV"
           << G4endl;
  }
}

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void G4eeToHadronsMultiModel::SetCrossSecFactor(G4double fac)
{
  if(fac > 1.0) {
    csFactor = fac;
    if(verbose > 0)
      G4cout << "### G4eeToHadronsMultiModel: The cross section for G4eeToHadronsMultiModel "
             << " is increased by the Factor= " << csFactor << G4endl;
  }
}

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