G4EmBuilder.cc

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//
// Geant4 class G4EmBuilder
//
// Author V.Ivanchenko 22.05.2020
//
 
#include "G4EmBuilder.hh"
 
#include "G4SystemOfUnits.hh"
#include "G4ParticleDefinition.hh"
#include "G4EmParameters.hh"
#include "G4VEnergyLossProcess.hh"
 
#include "G4MuMultipleScattering.hh"
#include "G4hMultipleScattering.hh"
#include "G4CoulombScattering.hh"
#include "G4WentzelVIModel.hh"
 
#include "G4MuBremsstrahlungModel.hh"
#include "G4MuPairProductionModel.hh"
#include "G4hBremsstrahlungModel.hh"
#include "G4hPairProductionModel.hh"
 
#include "G4MuIonisation.hh"
#include "G4MuBremsstrahlung.hh"
#include "G4MuPairProduction.hh"
#include "G4hBremsstrahlung.hh"
#include "G4hPairProduction.hh"
 
#include "G4hIonisation.hh"
#include "G4ionIonisation.hh"
#include "G4alphaIonisation.hh"
#include "G4NuclearStopping.hh"
 
#include "G4MuMultipleScattering.hh"
#include "G4hMultipleScattering.hh"
#include "G4CoulombScattering.hh"
 
#include "G4ParticleTable.hh"
#include "G4Gamma.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
 
#include "G4MuonPlus.hh"
#include "G4MuonMinus.hh"
#include "G4PionPlus.hh"
#include "G4PionMinus.hh"
#include "G4KaonPlus.hh"
#include "G4KaonMinus.hh"
#include "G4Proton.hh"
#include "G4AntiProton.hh"
 
#include "G4Deuteron.hh"
#include "G4Triton.hh"
#include "G4He3.hh"
#include "G4Alpha.hh"
#include "G4GenericIon.hh"
 
#include "G4PhysicsListHelper.hh"
#include "G4HadParticles.hh"
#include "G4HadronicParameters.hh"
#include "G4LossTableManager.hh"
#include "G4UAtomicDeexcitation.hh"
 
void G4EmBuilder::ConstructBasicEmPhysics(G4hMultipleScattering* hmsc,
                          const std::vector<G4int>& partList)
{
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
  G4ParticleTable* table = G4ParticleTable::GetParticleTable();
 
  for( auto & pdg : partList ) {
    auto part = table->FindParticle( pdg );
    if ( part == nullptr || part->GetPDGCharge() == 0.0 ) { continue; }
    ph->RegisterProcess(hmsc, part);
    ph->RegisterProcess(new G4hIonisation(), part);
  }
}
 
void G4EmBuilder::ConstructIonEmPhysics(G4hMultipleScattering* hmsc, 
                                        G4NuclearStopping* nucStopping)
{
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
 
  G4ParticleDefinition* part = G4Deuteron::Deuteron();
  ph->RegisterProcess(hmsc, part);
  ph->RegisterProcess(new G4hIonisation(), part);
 
  part = G4Triton::Triton();
  ph->RegisterProcess(hmsc, part);
  ph->RegisterProcess(new G4hIonisation(), part);
 
  part = G4He3::He3();
  ph->RegisterProcess(new G4hMultipleScattering(), part);
  ph->RegisterProcess(new G4ionIonisation(), part);
  if( nucStopping != nullptr ) {
    ph->RegisterProcess(nucStopping, part);
  }
 
  part = G4Alpha::Alpha();
  ph->RegisterProcess(new G4hMultipleScattering(), part);
  ph->RegisterProcess(new G4ionIonisation(), part);
  if( nucStopping != nullptr ) {
    ph->RegisterProcess(nucStopping, part);
  }
}
 
void G4EmBuilder::ConstructLightHadrons(G4ParticleDefinition* part1,
                        G4ParticleDefinition* part2,
                        G4bool isHEP, G4bool isProton, 
                                        G4bool isWVI)
{
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
 
  G4hBremsstrahlung* brem = ( isHEP ) ? new G4hBremsstrahlung() : nullptr;
  G4hPairProduction* pair = ( isHEP ) ? new G4hPairProduction() : nullptr;
 
  G4hMultipleScattering* msc = new G4hMultipleScattering();
  if(isWVI) { msc->SetEmModel(new G4WentzelVIModel()); }
  G4CoulombScattering* ss = ( isWVI ) ? new G4CoulombScattering() : nullptr;
 
  ph->RegisterProcess(msc, part1);
  ph->RegisterProcess(new G4hIonisation(), part1);
  if( isHEP ) {
    ph->RegisterProcess(brem, part1);
    ph->RegisterProcess(pair, part1);
  }
  if( isWVI ) { ph->RegisterProcess(ss, part1); }
 
  if( isProton ) {
    msc = new G4hMultipleScattering();
    if(isWVI) { 
      msc->SetEmModel(new G4WentzelVIModel());
      ss = new G4CoulombScattering();
    }
  }
  ph->RegisterProcess(msc, part2);
  ph->RegisterProcess(new G4hIonisation(), part2);
  if( isHEP ) {
    ph->RegisterProcess(brem, part2);
    ph->RegisterProcess(pair, part2);
  }
  if( isWVI ) { ph->RegisterProcess(ss, part2); }
}
 
void G4EmBuilder::ConstructCharged(G4hMultipleScattering* hmsc,
                                   G4NuclearStopping* nucStopping,
                                   G4bool isWVI) 
{
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
  G4EmParameters* param = G4EmParameters::Instance();
  G4HadronicParameters* hpar = G4HadronicParameters::Instance();
  G4bool isHEP = ( param->MaxKinEnergy() > hpar->EnergyThresholdForHeavyHadrons() );
 
  // muon bremsstrahlung and pair production
  G4MuBremsstrahlung* mub = ( isHEP ) ? new G4MuBremsstrahlung() : nullptr;
  G4MuPairProduction* mup = ( isHEP ) ? new G4MuPairProduction() : nullptr;
 
  // muon multiple and single scattering
  G4MuMultipleScattering* mumsc = new G4MuMultipleScattering();
  if(isWVI) { mumsc->SetEmModel(new G4WentzelVIModel()); }
  G4CoulombScattering* muss = ( isWVI ) ? new G4CoulombScattering() : nullptr;
 
  // Add standard EM Processes
  // mu+-
  G4ParticleDefinition* part = G4MuonPlus::MuonPlus();
  ph->RegisterProcess(mumsc, part);
  ph->RegisterProcess(new G4MuIonisation(), part);
  if( isHEP ) {
    ph->RegisterProcess(mub, part);
    ph->RegisterProcess(mup, part);
  }
  if( isWVI ) { ph->RegisterProcess(muss, part); }
 
  part = G4MuonMinus::MuonMinus();
  ph->RegisterProcess(mumsc, part);
  ph->RegisterProcess(new G4MuIonisation(), part);
  if( isHEP ) {
    ph->RegisterProcess(mub, part);
    ph->RegisterProcess(mup, part);
  }
  if( isWVI ) { ph->RegisterProcess(muss, part); }
 
  // pi+-
  ConstructLightHadrons(G4PionPlus::PionPlus(), G4PionMinus::PionMinus(), isHEP, false, isWVI);
 
  // K+-
  ConstructLightHadrons(G4KaonPlus::KaonPlus(), G4KaonMinus::KaonMinus(), isHEP, false, isWVI);
 
  // p, pbar
  ConstructLightHadrons(G4Proton::Proton(), G4AntiProton::AntiProton(), isHEP, true, isWVI);
  if( nucStopping != nullptr ) {
    ph->RegisterProcess(nucStopping, G4Proton::Proton());
  }
 
  // ions
  ConstructIonEmPhysics(hmsc, nucStopping);
 
  // hyperons and anti particles
  if( isHEP ) { 
    ConstructBasicEmPhysics(hmsc, G4HadParticles::GetHeavyChargedParticles());
 
    // b- and c- charged particles
    if( hpar->EnableBCParticles() ) {
      ConstructBasicEmPhysics(hmsc, G4HadParticles::GetBCChargedHadrons());
    }
  }
}
 
void G4EmBuilder::ConstructMinimalEmSet()
{
  // gamma
  G4Gamma::Gamma();
  // leptons
  G4Electron::Electron();
  G4Positron::Positron();
  G4MuonPlus::MuonPlus();
  G4MuonMinus::MuonMinus();
  // mesons
  G4PionPlus::PionPlus();
  G4PionMinus::PionMinus();
  G4KaonPlus::KaonPlus();
  G4KaonMinus::KaonMinus();
  // barions
  G4Proton::Proton();
  G4AntiProton::AntiProton();
  // ions
  G4Deuteron::Deuteron();
  G4Triton::Triton();
  G4He3::He3();
  G4Alpha::Alpha();
  G4GenericIon::GenericIonDefinition();
}
 
void G4EmBuilder::PrepareEMPhysics()
{
  G4LossTableManager* man = G4LossTableManager::Instance();
  G4VAtomDeexcitation* ad = man->AtomDeexcitation();
  if(!ad) {
    ad = new G4UAtomicDeexcitation();
    man->SetAtomDeexcitation(ad);
  }
}