RE02/src/RE02PrimaryGeneratorAction.cc

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