TestEm18/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028
0029 #include "PrimaryGeneratorAction.hh"
0030
0031 #include "DetectorConstruction.hh"
0032
0033 #include "G4Event.hh"
0034 #include "G4ParticleDefinition.hh"
0035 #include "G4ParticleTable.hh"
0036 #include "G4SystemOfUnits.hh"
0037 #include "Randomize.hh"
0038
0039 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0040
0041 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) : fDetector(det)
0042 {
0043   fParticleGun = new G4ParticleGun(1);
0044   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
0045   fParticleGun->SetParticleDefinition(particle);
0046   fParticleGun->SetParticleEnergy(10 * MeV);
0047   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0048 }
0049
0050 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0051
0052 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0053 {
0054   delete fParticleGun;
0055 }
0056
0057 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0058
0059 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0060 {
0061   // this function is called at the begining of event
0062   //
0063   G4double halfSize = 0.5 * (fDetector->GetSize());
0064   G4double x0 = -halfSize;
0065
0066   // randomize (y0,z0)
0067   //
0068   G4double beam = 0.8 * halfSize;
0069   G4double y0 = (2 * G4UniformRand() - 1.) * beam;
0070   G4double z0 = (2 * G4UniformRand() - 1.) * beam;
0071
0072   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0073   fParticleGun->GeneratePrimaryVertex(anEvent);
0074 }
0075
0076 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......