BDSPhysicsMilli.cc

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) BDSIM Collaboration, 2001 - 2026.
 
This file is part of BDSIM.
 
BDSIM is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published 
by the Free Software Foundation version 3 of the License.
 
BDSIM is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with BDSIM.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "BDSParticleMilli.hh"
#include "BDSPhysicsMilli.hh"
 
#include "G4AutoDelete.hh"
#include "G4BuilderType.hh"
#include "G4hMultipleScattering.hh"
#include "G4ParticleDefinition.hh"
#include "G4ParticleTable.hh" // for iterator
#include "G4PhysicsListHelper.hh"
#include "G4ProcessManager.hh"
#include "G4WentzelVIModel.hh"
#include "G4StepLimiter.hh"
#include "G4String.hh"
#include "G4Version.hh"
 
#include "CLHEP/Units/SystemOfUnits.h"
 
 
BDSPhysicsMilli::BDSPhysicsMilli(const G4String& millichargeNameIn,
                                 G4int verboseIn):
  G4VPhysicsConstructor("G4millicharged"),
  millichargeName(millichargeNameIn),
  verbose(verboseIn)
{
  SetVerboseLevel(verbose); // base class method
  G4EmParameters* param = G4EmParameters::Instance();
  param->SetDefaults();
  param->SetVerbose(verbose);
  param->SetMinEnergy(100*CLHEP::eV);
  param->SetMaxEnergy(10*CLHEP::TeV);
  //param->SetLowestElectronEnergy(10*eV);
  //param->SetNumberOfBinsPerDecade(20);
  //param->ActivateAngularGeneratorForIonisation(true);
  //param->SetMscThetaLimit(0.0);
  //param->SetFluo(true);
  //param->SetAuger(true);
  //param->SetPixe(true);
  SetPhysicsType((G4int)G4BuilderType::bElectromagnetic);
}
 
BDSPhysicsMilli::~BDSPhysicsMilli()
{;}
 
void BDSPhysicsMilli::ConstructParticle()
{
  ParticleMilli::MillichargeDefinition();
}
 
void BDSPhysicsMilli::ConstructProcess()
{
  //G4CoulombScattering* hCoul = nullptr;
  //hCoul = new G4CoulombScattering();
  auto* hMpl = new G4hMultipleScattering();
  G4AutoDelete::Register(hMpl);
  auto* modelmpl = new G4WentzelVIModel();
  G4AutoDelete::Register(modelmpl);
  modelmpl->SetActivationLowEnergyLimit(1.0*CLHEP::MeV);
  hMpl->SetEmModel(modelmpl, 1);
  
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
  
#if G4VERSION_NUMBER > 1029
  auto aParticleIterator = GetParticleIterator();
#endif
  aParticleIterator->reset();
  
  while( (*aParticleIterator)() )
    {
      G4ParticleDefinition* particle = aParticleIterator->value();
      G4String particleName = particle->GetParticleName();
      
      if (particleName == millichargeName)
        {
          //ph->RegisterProcess(hCoul, particle);
          ph->RegisterProcess(hMpl, particle);
          ph->RegisterProcess(new G4StepLimiter(), particle);
          continue;
        }
    }
}