Geant4 Cross Reference

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Geant4/examples/extended/exoticphysics/ucn/src/ExUCNPrimaryGeneratorAction.cc

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 26 //
 27 /// \file exoticphysics/ucn/src/ExUCNPrimaryGeneratorAction.cc
 28 /// \brief Implementation of the ExUCNPrimaryGeneratorAction class
 29 //
 30 
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 33 
 34 #include "ExUCNPrimaryGeneratorAction.hh"
 35 
 36 #include "ExUCNDetectorConstruction.hh"
 37 
 38 #include "G4Event.hh"
 39 #include "G4ParticleDefinition.hh"
 40 #include "G4ParticleGun.hh"
 41 #include "G4ParticleTable.hh"
 42 #include "G4PhysicalConstants.hh"
 43 #include "G4SystemOfUnits.hh"
 44 #include "Randomize.hh"
 45 
 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 47 
 48 ExUCNPrimaryGeneratorAction::ExUCNPrimaryGeneratorAction(void)
 49 {
 50   G4int n_particle = 1;
 51   fParticleGun = new G4ParticleGun(n_particle);
 52 
 53   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
 54 
 55   G4ParticleDefinition* particle = particleTable->FindParticle("neutron");
 56   fParticleGun->SetParticleDefinition(particle);
 57 }
 58 
 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 60 
 61 ExUCNPrimaryGeneratorAction::~ExUCNPrimaryGeneratorAction()
 62 {
 63   delete fParticleGun;
 64 }
 65 
 66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 67 
 68 void ExUCNPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 69 {
 70   // This function is called at the begining of event
 71 
 72   fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
 73   fParticleGun->SetParticlePolarization(G4ThreeVector(0, 1, 0));
 74 
 75   G4double particleEnergy = 1e-9 * eV + G4UniformRand() * (1e-7 * eV - 1e-9 * eV);
 76   fParticleGun->SetParticleEnergy(particleEnergy);
 77 
 78   G4double theta = 2 * pi * G4UniformRand();
 79   G4double phi = std::acos(1 - 2 * G4UniformRand());
 80   if (phi > pi / 2 && phi < pi) phi = pi - phi;
 81 
 82   G4double z = std::sin(phi) * std::cos(theta);
 83   G4double x = std::sin(phi) * std::sin(theta);
 84   G4double y = std::cos(phi);
 85 
 86   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(x, y, z));
 87 
 88   fParticleGun->GeneratePrimaryVertex(anEvent);
 89 }
 90 
 91 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 92