ThreadsafeScorers/src/TSPrimaryGeneratorAction.cc

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0025 //
0026 /// \file TSPrimaryGeneratorAction.cc
0027 /// \brief Implementation of the TSPrimaryGeneratorAction class
0028 ///
0029 /// Simple PrimaryGeneratorAction that produces a -Z surface flux of 1 MeV
0030 ///     neutrons into the world
0031 //
0032 //
0033 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0034 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0035
0036 #include "TSPrimaryGeneratorAction.hh"
0037
0038 #include "TSDetectorConstruction.hh"
0039
0040 #include "G4Event.hh"
0041 #include "G4ParticleDefinition.hh"
0042 #include "G4ParticleGun.hh"
0043 #include "G4ParticleTable.hh"
0044 #include "G4RunManager.hh"
0045
0046 using namespace CLHEP;
0047
0048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0049
0050 TSPrimaryGeneratorAction::TSPrimaryGeneratorAction()
0051 {
0052   fGun = new G4ParticleGun(1);
0053
0054   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0055   G4String particleName;
0056   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "neutron");
0057
0058   fGun->SetParticleDefinition(particle);
0059   fGun->SetParticleEnergy(1. * MeV);
0060 }
0061
0062 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0063
0064 TSPrimaryGeneratorAction::~TSPrimaryGeneratorAction()
0065 {
0066   delete fGun;
0067 }
0068
0069 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0070
0071 void TSPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0072 {
0073   static TSDetectorConstruction* detector = TSDetectorConstruction::Instance();
0074
0075   G4ThreeVector dir(0., 0., 1.);
0076   G4ThreeVector pos(detector->GetWorldDimensions().x() * (G4UniformRand() - 0.5),
0077                     detector->GetWorldDimensions().y() * (G4UniformRand() - 0.5),
0078                     -0.5 * detector->GetWorldDimensions().z());
0079
0080   dir /= dir.mag();
0081   fGun->SetParticleMomentumDirection(dir);
0082   fGun->SetParticlePosition(pos);
0083   fGun->GeneratePrimaryVertex(anEvent);
0084 }
0085
0086 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......