ThreadsafeScorers/src/TSPrimaryGeneratorAction.cc

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0025 //
0026 /// \file parallel/ThreadsafeScorers/src/TSPrimaryGeneratorAction.cc
0027 /// \brief Implementation of the TSPrimaryGeneratorAction class
0028 //
0029 //
0030 //
0031 //
0032 /// Simple PrimaryGeneratorAction that produces a -Z surface flux of 1 MeV
0033 ///     neutrons into the world
0034 //
0035 //
0036 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0037 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0038
0039 #include "TSPrimaryGeneratorAction.hh"
0040
0041 #include "TSDetectorConstruction.hh"
0042
0043 #include "G4Event.hh"
0044 #include "G4ParticleDefinition.hh"
0045 #include "G4ParticleGun.hh"
0046 #include "G4ParticleTable.hh"
0047 #include "G4RunManager.hh"
0048
0049 using namespace CLHEP;
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0052
0053 TSPrimaryGeneratorAction::TSPrimaryGeneratorAction()
0054 {
0055   fGun = new G4ParticleGun(1);
0056
0057   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0058   G4String particleName;
0059   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "neutron");
0060
0061   fGun->SetParticleDefinition(particle);
0062   fGun->SetParticleEnergy(1. * MeV);
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 TSPrimaryGeneratorAction::~TSPrimaryGeneratorAction()
0068 {
0069   delete fGun;
0070 }
0071
0072 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0073
0074 void TSPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0075 {
0076   static TSDetectorConstruction* detector = TSDetectorConstruction::Instance();
0077
0078   G4ThreeVector dir(0., 0., 1.);
0079   G4ThreeVector pos(detector->GetWorldDimensions().x() * (G4UniformRand() - 0.5),
0080                     detector->GetWorldDimensions().y() * (G4UniformRand() - 0.5),
0081                     -0.5 * detector->GetWorldDimensions().z());
0082
0083   dir /= dir.mag();
0084   fGun->SetParticleMomentumDirection(dir);
0085   fGun->SetParticlePosition(pos);
0086   fGun->GeneratePrimaryVertex(anEvent);
0087 }
0088
0089 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......