G4eeToHadronsMultiModel.cc

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// -------------------------------------------------------------------
//
// 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"
#include "G4Positron.hh"
 
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using namespace std;
 
G4eeToHadronsMultiModel::G4eeToHadronsMultiModel(G4int ver, 
  const G4String& mname) : G4VEmModel(mname), verbose(ver)
{
  maxKineticEnergy = 4.521*CLHEP::GeV;  //crresponding to 10TeV in lab
  delta = 1.0*CLHEP::MeV;  //for bin width
}
 
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G4eeToHadronsMultiModel::~G4eeToHadronsMultiModel()
{
  delete cross;
}
 
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void G4eeToHadronsMultiModel::Initialise(const G4ParticleDefinition*, 
                     const G4DataVector& cuts) 
{
  if(!isInitialised) {
    isInitialised = true;
 
    //G4cout<<"###Initialise in HadronMultiModel###"<<G4endl;
 
    cross = new G4eeCrossSections();
 
    G4eeToTwoPiModel* m2pi = 
      new G4eeToTwoPiModel(cross,maxKineticEnergy,delta);
    AddEEModel(m2pi,cuts);
 
    G4eeTo3PiModel* m3pi = 
      new G4eeTo3PiModel(cross,maxKineticEnergy,delta);
    AddEEModel(m3pi,cuts);
 
    G4ee2KChargedModel* m2kc = 
      new G4ee2KChargedModel(cross,maxKineticEnergy,delta);
    AddEEModel(m2kc,cuts);
 
    G4ee2KNeutralModel* m2kn = 
      new G4ee2KNeutralModel(cross,maxKineticEnergy,delta);
    AddEEModel(m2kn,cuts);
 
    G4eeToPGammaModel* mpg1 = 
      new G4eeToPGammaModel(cross,"pi0",maxKineticEnergy,delta);
    AddEEModel(mpg1,cuts);
 
    G4eeToPGammaModel* mpg2 = 
      new G4eeToPGammaModel(cross,"eta",maxKineticEnergy,delta);
    AddEEModel(mpg2,cuts);
 
    nModels = (G4int)models.size();
 
    fParticleChange = GetParticleChangeForGamma();
  }
}
 
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void G4eeToHadronsMultiModel::AddEEModel(G4Vee2hadrons* mod,
                     const G4DataVector& cuts)
{
  G4eeToHadronsModel* model = new G4eeToHadronsModel(mod, verbose);
  models.push_back(model);
  G4double elow = mod->LowEnergy();   
  ekinMin.push_back(elow);
  if(thKineticEnergy > elow) { thKineticEnergy = elow; }
  ekinMax.push_back(mod->HighEnergy()); 
  ekinPeak.push_back(mod->PeakEnergy());
  cumSum.push_back(0.0);
 
  const G4ParticleDefinition* positron = G4Positron::Positron();
  model->Initialise(positron,cuts);
}
 
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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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G4double G4eeToHadronsMultiModel::ComputeCrossSectionPerElectron(const G4ParticleDefinition*,
                                 G4double kineticEnergy,
                                 G4double, G4double)
{
  G4double res = 0.0;
 
  G4double energy = LabToCM(kineticEnergy);
 
  if (energy > thKineticEnergy) {
    for(G4int i=0; i<nModels; i++) {
      if(energy >= ekinMin[i] && energy <= ekinMax[i]){
        res += (models[i])->ComputeCrossSectionPerElectron(0,energy);
      }
      cumSum[i] = res;
    }
  }
  return res*csFactor;
}
 
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void G4eeToHadronsMultiModel::SampleSecondaries(
           std::vector<G4DynamicParticle*>* newp,
       const G4MaterialCutsCouple* couple,
       const G4DynamicParticle* dp,
       G4double, G4double)
{
  G4double kinEnergy = dp->GetKineticEnergy();
  G4double energy = LabToCM(kinEnergy);
  if (energy > 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::ModelDescription(std::ostream& outFile) const
{
  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; 
    outFile << "      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 " 
         << csFactor << " times" << G4endl;
    }
  }
}
 
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