G4hIonisation.cc

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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4hIonisation
//
// Author:        Laszlo Urban
//
// Creation date: 30.05.1997
//
// Modified by Laszlo Urban, Michel Maire and Vladimir Ivanchenko
//
//
// -------------------------------------------------------------------
//
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#include "G4hIonisation.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Electron.hh"
#include "G4Proton.hh"
#include "G4AntiProton.hh"
#include "G4BraggModel.hh"
#include "G4BetheBlochModel.hh"
#include "G4IonFluctuations.hh"
#include "G4UniversalFluctuation.hh"
#include "G4BohrFluctuations.hh"
#include "G4UnitsTable.hh"
#include "G4PionPlus.hh"
#include "G4PionMinus.hh"
#include "G4KaonPlus.hh"
#include "G4KaonMinus.hh"
#include "G4ICRU73QOModel.hh"
#include "G4EmParameters.hh"
 
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using namespace std;
 
G4hIonisation::G4hIonisation(const G4String& name)
  : G4VEnergyLossProcess(name),
    isInitialised(false)
{
  SetProcessSubType(fIonisation);
  SetSecondaryParticle(G4Electron::Electron());
  mass = 0.0;
  ratio = 0.0;
  eth = 2*MeV;
}
 
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G4hIonisation::~G4hIonisation()
{}
 
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G4bool G4hIonisation::IsApplicable(const G4ParticleDefinition& p)
{
  return (p.GetPDGCharge() != 0.0 && p.GetPDGMass() > 10.0*MeV &&
     !p.IsShortLived());
}
 
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G4double G4hIonisation::MinPrimaryEnergy(const G4ParticleDefinition*,
                     const G4Material*,
                     G4double cut)
{
  G4double x = 0.5*cut/electron_mass_c2;
  G4double gam = x*ratio + std::sqrt((1. + x)*(1. + x*ratio*ratio));
  return mass*(gam - 1.0);
}
 
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void G4hIonisation::InitialiseEnergyLossProcess(
            const G4ParticleDefinition* part,
            const G4ParticleDefinition* bpart)
{
  if(!isInitialised) {
 
    const G4ParticleDefinition* theBaseParticle = nullptr;
    G4String pname = part->GetParticleName();
    G4double q = part->GetPDGCharge();
 
    //G4cout << " G4hIonisation::InitialiseEnergyLossProcess " << pname 
    //   << "  " << bpart << G4endl;
 
    // standard base particles
    if(part == bpart || pname == "proton" ||
       pname == "anti_proton" || 
       pname == "pi+" || pname == "pi-" || 
       pname == "kaon+" || pname == "kaon-" || pname == "GenericIon"
       || pname == "He3" || pname == "alpha") 
      { 
    theBaseParticle = nullptr;
      }
    // select base particle 
    else if(bpart == nullptr) {
 
      if(part->GetPDGSpin() == 0.0) {
    if(q > 0.0) { theBaseParticle = G4KaonPlus::KaonPlus(); }
    else { theBaseParticle = G4KaonMinus::KaonMinus(); }
      } else {
    if(q > 0.0) { theBaseParticle = G4Proton::Proton(); } 
    else { theBaseParticle = G4AntiProton::AntiProton(); }
      }
 
      // base particle defined by interface
    } else { 
      theBaseParticle = bpart;
    }
    SetBaseParticle(theBaseParticle);
 
    mass  = part->GetPDGMass();
    ratio = electron_mass_c2/mass;
    eth   = 2.0*MeV*mass/proton_mass_c2;
 
    G4EmParameters* param = G4EmParameters::Instance();
    G4double emin = std::min(param->MinKinEnergy(), 0.1*eth);
    G4double emax = std::max(param->MaxKinEnergy(), 100*eth);
 
    if(emin != param->MinKinEnergy() || emax != param->MaxKinEnergy()) {
      SetMinKinEnergy(emin);
      SetMaxKinEnergy(emax);
      G4int bin = G4lrint(param->NumberOfBinsPerDecade()*std::log10(emax/emin));
      SetDEDXBinning(bin);
    }
 
    if (!EmModel(0)) { 
      if(q > 0.0) { SetEmModel(new G4BraggModel()); }
      else        { SetEmModel(new G4ICRU73QOModel()); }
    }
    EmModel(0)->SetLowEnergyLimit(emin);
    EmModel(0)->SetHighEnergyLimit(eth);
    AddEmModel(1, EmModel(0), new G4IonFluctuations());
 
    if (!FluctModel()) { SetFluctModel(new G4UniversalFluctuation()); }
 
    if (!EmModel(1)) { SetEmModel(new G4BetheBlochModel()); }
    EmModel(1)->SetLowEnergyLimit(eth);
    EmModel(1)->SetHighEnergyLimit(emax);
    AddEmModel(1, EmModel(1), FluctModel());  
 
    isInitialised = true;
  }
}
 
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void G4hIonisation::PrintInfo()
{}
 
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void G4hIonisation::ProcessDescription(std::ostream& out) const
{
  out << "  Ionisation";
  G4VEnergyLossProcess::ProcessDescription(out);
}
 
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