G4ionIonisation.cc

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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4ionIonisation
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 07.05.2002
//
// Modifications:
//
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
// 26-12-02 Secondary production moved to derived classes (V.Ivanchenko)
// 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
// 18-04-03 Use IonFluctuations (V.Ivanchenko)
// 03-08-03 Add effective charge (V.Ivanchenko)
// 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
// 27-05-04 Set integral to be a default regime (V.Ivanchenko)
// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 10-01-06 SetStepLimits -> SetStepFunction (V.Ivantchenko)
// 10-05-06 Add a possibility to download user data (V.Ivantchenko)
// 13-05-06 Add data for light ion stopping in water (V.Ivantchenko)
// 14-01-07 use SetEmModel() and SetFluctModel() from G4VEnergyLossProcess (mma)
// 16-05-07 Add data for light ion stopping only for GenericIon (V.Ivantchenko)
// 07-11-07 Fill non-ionizing energy loss (V.Ivantchenko)
// 12-09-08 Removed InitialiseMassCharge and CorrectionsAlongStep (VI)
//
//
// -------------------------------------------------------------------
//
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#include "G4ionIonisation.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Electron.hh"
#include "G4Proton.hh"
#include "G4GenericIon.hh"
#include "G4Alpha.hh"
#include "G4BraggModel.hh"
#include "G4BraggIonModel.hh"
#include "G4BetheBlochModel.hh"
#include "G4UnitsTable.hh"
#include "G4LossTableManager.hh"
#include "G4WaterStopping.hh"
#include "G4EmCorrections.hh"
#include "G4IonFluctuations.hh"
#include "G4EmParameters.hh"
 
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G4ionIonisation::G4ionIonisation(const G4String& name)
  : G4VEnergyLossProcess(name),
    theParticle(nullptr),
    isInitialised(false),
    stopDataActive(false)
{
  SetLinearLossLimit(0.02);
  SetProcessSubType(fIonisation);
  SetSecondaryParticle(G4Electron::Electron());
  corr = G4LossTableManager::Instance()->EmCorrections();
  eth = 2*CLHEP::MeV;
}
 
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G4ionIonisation::~G4ionIonisation()
{}
 
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G4bool G4ionIonisation::IsApplicable(const G4ParticleDefinition&)
{
  return true;
}
 
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G4double G4ionIonisation::MinPrimaryEnergy(const G4ParticleDefinition* p, 
                       const G4Material*, 
                       G4double cut)
{
  return p->GetPDGMass()*(std::sqrt(1. + 0.5*cut/CLHEP::electron_mass_c2) - 1.0);
}
 
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void G4ionIonisation::InitialiseEnergyLossProcess(
              const G4ParticleDefinition* part,
              const G4ParticleDefinition* bpart)
{
  const G4ParticleDefinition* ion = G4GenericIon::GenericIon();
 
  if(!isInitialised) {
    theParticle = part;
 
    // define base particle
    const G4ParticleDefinition* theBaseParticle = nullptr;
    const G4int pdg = part->GetPDGEncoding();
 
    // define base particle
    if(part == bpart) { 
      theBaseParticle = nullptr;
    } else if(nullptr != bpart) { 
      theBaseParticle = bpart;
    } else if(part == ion || pdg == 1000020040) { 
      theBaseParticle = nullptr;
    } else { 
      theBaseParticle = ion; 
    }
 
    SetBaseParticle(theBaseParticle);
 
    if (nullptr == EmModel(0)) { SetEmModel(new G4BraggIonModel()); }
 
    G4EmParameters* param = G4EmParameters::Instance();
    EmModel(0)->SetLowEnergyLimit(param->MinKinEnergy());
 
    // model limit defined for protons
    eth = (EmModel(0)->HighEnergyLimit())
      *part->GetPDGMass()/CLHEP::proton_mass_c2;
    EmModel(0)->SetHighEnergyLimit(eth);
 
    if (nullptr == FluctModel()) { SetFluctModel(new G4IonFluctuations()); }
    AddEmModel(1, EmModel(0), FluctModel());
 
    G4double emax = param->MaxKinEnergy();
    if(eth < 0.99*emax) {
      if (nullptr == EmModel(1)) { SetEmModel(new G4BetheBlochModel()); }  
      EmModel(1)->SetLowEnergyLimit(eth);
      EmModel(1)->SetHighEnergyLimit(emax);
      AddEmModel(2, EmModel(1), FluctModel());    
 
      // Add ion stoping tables for Generic Ion if the default 
      // model is used (with eth ~= 2 MeV)
      if(part == ion && (EmModel(1)->GetName() == "BetheBloch" ||
             EmModel(1)->GetName() == "BetheBlochGasIon")) {
    stopDataActive = true;
    G4WaterStopping  ws(corr, true);
    corr->SetIonisationModels(EmModel(0),EmModel(1));
      }
    } else {
      EmModel(0)->SetHighEnergyLimit(emax);
    }
    isInitialised = true;
  }
  // reinitialisation of corrections for the new run
  if(part == ion) { corr->InitialiseForNewRun(); }
}
 
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void G4ionIonisation::StreamProcessInfo(std::ostream& out) const
{
  if (stopDataActive && G4GenericIon::GenericIon() == theParticle) {
    out << "      Stopping Power data for " 
    << corr->GetNumberOfStoppingVectors()
    << " ion/material pairs" << G4endl;
  }
}
 
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void G4ionIonisation::AddStoppingData(G4int Z, G4int A,
                      const G4String& mname,
                      G4PhysicsVector* dVector)
{
  corr->AddStoppingData(Z, A, mname, dVector);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4ionIonisation::ProcessDescription(std::ostream& out) const
{
  out << "  Ion ionisation";
  G4VEnergyLossProcess::ProcessDescription(out);
}
 
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