G4EmStandardPhysicsGS.cc

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//
//---------------------------------------------------------------------------
//
// ClassName:   G4EmStandardPhysicsGS
//
// Author:      V.Ivanchenko 05.06.2015
//
// Modified:
//
// Class Description:
//
// Standard EM physics constructor for HEP applications with the Goudsmit
// -Saunderson MSC model for e-/e+ Coulomb scattering below 100 [MeV] (instead
// of the Urban model). Note, that the Goudsmit-Saunderson MSC model used here
// with its HEP settings (i.e. less accurate). The Goudsmit-Saunderson MSC
// model with its most accurate settings is used in the G4EmStandard_opt4
// physics constructor for e-/e+ Coulomb scattering.
//
//----------------------------------------------------------------------------
//
 
#include "G4EmStandardPhysicsGS.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleDefinition.hh"
#include "G4EmParameters.hh"
#include "G4EmBuilder.hh"
#include "G4LossTableManager.hh"
 
#include "G4ComptonScattering.hh"
#include "G4GammaConversion.hh"
#include "G4PhotoElectricEffect.hh"
#include "G4RayleighScattering.hh"
#include "G4LivermorePhotoElectricModel.hh"
 
#include "G4eMultipleScattering.hh"
#include "G4hMultipleScattering.hh"
#include "G4CoulombScattering.hh"
#include "G4eCoulombScatteringModel.hh"
#include "G4WentzelVIModel.hh"
#include "G4UrbanMscModel.hh"
#include "G4GoudsmitSaundersonMscModel.hh"
 
#include "G4eIonisation.hh"
#include "G4eBremsstrahlung.hh"
#include "G4eplusAnnihilation.hh"
 
#include "G4hIonisation.hh"
#include "G4ionIonisation.hh"
 
#include "G4Gamma.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "G4GenericIon.hh"
 
#include "G4PhysicsListHelper.hh"
#include "G4BuilderType.hh"
#include "G4EmModelActivator.hh"
 
// factory
#include "G4PhysicsConstructorFactory.hh"
//
G4_DECLARE_PHYSCONSTR_FACTORY(G4EmStandardPhysicsGS);
 
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G4EmStandardPhysicsGS::G4EmStandardPhysicsGS(G4int ver, const G4String&)
  : G4VPhysicsConstructor("G4EmStandardGS")
{
  SetVerboseLevel(ver);
  G4EmParameters* param = G4EmParameters::Instance();
  param->SetDefaults();
  param->SetVerbose(ver);
  param->SetMscRangeFactor(0.06);
  //  param->SetMscStepLimitType(fUseSafetyPlus); // corresponds to the error-free stepping
  //  param->SetFluo(true);
  SetPhysicsType(bElectromagnetic);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4EmStandardPhysicsGS::~G4EmStandardPhysicsGS()
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4EmStandardPhysicsGS::ConstructParticle()
{
  // minimal set of particles for EM physics
  G4EmBuilder::ConstructMinimalEmSet();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4EmStandardPhysicsGS::ConstructProcess()
{
  if(verboseLevel > 1) {
    G4cout << "### " << GetPhysicsName() << " Construct Processes " << G4endl;
  }
  G4EmBuilder::PrepareEMPhysics();
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
 
  // processes used by several particles
  G4hMultipleScattering* hmsc = new G4hMultipleScattering("ionmsc");
  G4NuclearStopping* pnuc(nullptr);
 
  // high energy limit for e+- scattering models and bremsstrahlung
  G4double highEnergyLimit = G4EmParameters::Instance()->MscEnergyLimit();
 
  // Add gamma EM processes
  G4ParticleDefinition* particle = G4Gamma::Gamma();
 
  G4PhotoElectricEffect* pee = new G4PhotoElectricEffect();
  pee->SetEmModel(new G4LivermorePhotoElectricModel());
  ph->RegisterProcess(pee, particle);
 
  ph->RegisterProcess(new G4ComptonScattering(), particle);
  ph->RegisterProcess(new G4GammaConversion(), particle);
  ph->RegisterProcess(new G4RayleighScattering(), particle);
 
  // e-
  particle = G4Electron::Electron();
 
  G4eMultipleScattering* msc = new G4eMultipleScattering;
  G4GoudsmitSaundersonMscModel* msc1 = new G4GoudsmitSaundersonMscModel();
  G4WentzelVIModel* msc2 = new G4WentzelVIModel();
  msc1->SetHighEnergyLimit(highEnergyLimit);
  msc2->SetLowEnergyLimit(highEnergyLimit);
  msc->SetEmModel(msc1);
  msc->SetEmModel(msc2);
 
  G4eCoulombScatteringModel* ssm = new G4eCoulombScatteringModel();
  G4CoulombScattering* ss = new G4CoulombScattering();
  ss->SetEmModel(ssm);
  ss->SetMinKinEnergy(highEnergyLimit);
  ssm->SetLowEnergyLimit(highEnergyLimit);
  ssm->SetActivationLowEnergyLimit(highEnergyLimit);
 
  ph->RegisterProcess(msc, particle);
  ph->RegisterProcess(new G4eIonisation(), particle);
  ph->RegisterProcess(new G4eBremsstrahlung(), particle);
  ph->RegisterProcess(ss, particle);
 
  // e+
  particle = G4Positron::Positron();
 
  msc = new G4eMultipleScattering;
  msc1 = new G4GoudsmitSaundersonMscModel();
  msc2 = new G4WentzelVIModel();
  msc1->SetHighEnergyLimit(highEnergyLimit);
  msc2->SetLowEnergyLimit(highEnergyLimit);
  msc->SetEmModel(msc1);
  msc->SetEmModel(msc2);
 
  ssm = new G4eCoulombScatteringModel();
  ss = new G4CoulombScattering();
  ss->SetEmModel(ssm);
  ss->SetMinKinEnergy(highEnergyLimit);
  ssm->SetLowEnergyLimit(highEnergyLimit);
  ssm->SetActivationLowEnergyLimit(highEnergyLimit);
 
  ph->RegisterProcess(msc, particle);
  ph->RegisterProcess(new G4eIonisation(), particle);
  ph->RegisterProcess(new G4eBremsstrahlung(), particle);
  ph->RegisterProcess(new G4eplusAnnihilation(), particle);
  ph->RegisterProcess(ss, particle);
 
  // generic ion
  particle = G4GenericIon::GenericIon();
  G4ionIonisation* ionIoni = new G4ionIonisation();
  ph->RegisterProcess(hmsc, particle);
  ph->RegisterProcess(ionIoni, particle);
 
  // muons, hadrons, ions
  G4EmBuilder::ConstructCharged(hmsc, pnuc);
 
  // extra configuration
  G4EmModelActivator mact(GetPhysicsName());
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......