TSPrimaryGeneratorAction.cc

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/// \file parallel/ThreadsafeScorers/src/TSPrimaryGeneratorAction.cc
/// \brief Implementation of the TSPrimaryGeneratorAction class
//
//
//
//
/// Simple PrimaryGeneratorAction that produces a -Z surface flux of 1 MeV
///     neutrons into the world
//
//
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#include "TSPrimaryGeneratorAction.hh"
#include "TSDetectorConstruction.hh"
 
#include "G4RunManager.hh"
#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4Profiler.hh"
#include "G4TiMemory.hh"
 
using namespace CLHEP;
 
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TSPrimaryGeneratorAction::TSPrimaryGeneratorAction()
{
  fGun = new G4ParticleGun(1);
 
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle =
    particleTable->FindParticle(particleName = "neutron");
 
  fGun->SetParticleDefinition(particle);
  fGun->SetParticleEnergy(1. * MeV);
}
 
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TSPrimaryGeneratorAction::~TSPrimaryGeneratorAction() { delete fGun; }
 
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void TSPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4USER_SCOPED_PROFILE(__FUNCTION__);
  static TSDetectorConstruction* detector = TSDetectorConstruction::Instance();
 
  G4ThreeVector dir(0., 0., 1.);
  G4ThreeVector pos(
    detector->GetWorldDimensions().x() * (G4UniformRand() - 0.5),
    detector->GetWorldDimensions().y() * (G4UniformRand() - 0.5),
    -0.5 * detector->GetWorldDimensions().z());
 
  dir /= dir.mag();
  fGun->SetParticleMomentumDirection(dir);
  fGun->SetParticlePosition(pos);
  fGun->GeneratePrimaryVertex(anEvent);
}
 
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