BDSPhysicsGammaToMuMu.cc

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) Royal Holloway, 
University of London 2001 - 2024.
 
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 "BDSDebug.hh"
#include "BDSPhysicsGammaToMuMu.hh"
 
#include "G4AutoDelete.hh"
#include "G4GammaConversionToMuons.hh"
#include "G4LeptonConstructor.hh"
#include "G4ParticleDefinition.hh"
#include "G4PhysicsListHelper.hh"
#include "G4String.hh"
#include "G4Version.hh"
 
 
BDSPhysicsGammaToMuMu::BDSPhysicsGammaToMuMu():
  G4VPhysicsConstructor("BDSPhysicsGammaToMuMu")
{;}
 
BDSPhysicsGammaToMuMu::~BDSPhysicsGammaToMuMu()
{;}
 
void BDSPhysicsGammaToMuMu::ConstructParticle()
{ 
  G4LeptonConstructor::ConstructParticle();
}
 
void BDSPhysicsGammaToMuMu::ConstructProcess()
{
  if (Activated())
    {return;}
  
  G4GammaConversionToMuons* gammaToMuPair = new G4GammaConversionToMuons();
  G4AutoDelete::Register(gammaToMuPair);
  
  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 == "gamma")
        {ph->RegisterProcess(gammaToMuPair, particle);}
    }
 
  SetActivated();
}