RE02/src/RE02PrimaryGeneratorAction.cc

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0025 //
0026 /// \file runAndEvent/RE02/src/RE02PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the RE02PrimaryGeneratorAction class
0028 //
0029 //
0030 //
0031
0032 #include "RE02PrimaryGeneratorAction.hh"
0033
0034 #include "G4Event.hh"
0035 #include "G4ParticleDefinition.hh"
0036 #include "G4ParticleGun.hh"
0037 #include "G4ParticleTable.hh"
0038 #include "G4SystemOfUnits.hh"
0039 #include "Randomize.hh"
0040 #include "globals.hh"
0041
0042 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0043 //
0044 RE02PrimaryGeneratorAction::RE02PrimaryGeneratorAction()
0045   : G4VUserPrimaryGeneratorAction(), fParticleGun(0)
0046 {
0047   G4int n_particle = 1;
0048   fParticleGun = new G4ParticleGun(n_particle);
0049
0050   // default particle
0051   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0052   G4ParticleDefinition* particle = particleTable->FindParticle("proton");
0053   fParticleGun->SetParticleDefinition(particle);
0054   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.0, 0.0, 1.));
0055   fParticleGun->SetParticleEnergy(150.0 * MeV);
0056   //
0057   // default beam position
0058   G4double position = -200. / 2. * cm;
0059   //
0060   // Initial beam spot size in sigma.; This is not a part of ParticleGun.
0061   fSigmaPosition = 10. * mm;
0062
0063   //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0064   //
0065   fParticleGun->SetParticlePosition(G4ThreeVector(0. * cm, 0. * cm, position));
0066 }
0067
0068 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0069 //
0070 RE02PrimaryGeneratorAction::~RE02PrimaryGeneratorAction()
0071 {
0072   delete fParticleGun;
0073 }
0074
0075 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0076 //
0077 void RE02PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0078 {
0079   G4ThreeVector position = fParticleGun->GetParticlePosition();
0080   G4double dx = (G4UniformRand() - 0.5) * fSigmaPosition;
0081   G4double dy = (G4UniformRand() - 0.5) * fSigmaPosition;
0082   position.setX(dx);
0083   position.setY(dy);
0084   fParticleGun->SetParticlePosition(position);
0085   fParticleGun->GeneratePrimaryVertex(anEvent);
0086 }