TestEm7/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 #include "PrimaryGeneratorMessenger.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
0041 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0042
0043 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
0044   : G4VUserPrimaryGeneratorAction(),
0045     fParticleGun(0),
0046     fDetector(det),
0047     fRndmBeam(0),
0048     fEbeamCumul(0),
0049     fGunMessenger(0)
0050 {
0051   fParticleGun = new G4ParticleGun(1);
0052   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("proton");
0053   fParticleGun->SetParticleDefinition(particle);
0054   fParticleGun->SetParticleEnergy(160 * MeV);
0055   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0056
0057   // create a messenger for this class
0058   fGunMessenger = new PrimaryGeneratorMessenger(this);
0059 }
0060
0061 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0062
0063 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0064 {
0065   delete fParticleGun;
0066   delete fGunMessenger;
0067 }
0068
0069 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0070
0071 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0072 {
0073   // this function is called at the begining of event
0074   //
0075   G4double x0 = -0.5 * (fDetector->GetWorldSizeX());
0076   G4double y0 = 0. * cm, z0 = 0. * cm;
0077
0078   // randomize the beam, if requested.
0079   //
0080   if (fRndmBeam > 0.) {
0081     if (fRndmBeam > fDetector->GetAbsorSizeYZ()) fRndmBeam = fDetector->GetAbsorSizeYZ();
0082     G4double rbeam = 0.5 * fRndmBeam;
0083     y0 = (2 * G4UniformRand() - 1.) * rbeam;
0084     z0 = (2 * G4UniformRand() - 1.) * rbeam;
0085   }
0086   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0087   fParticleGun->GeneratePrimaryVertex(anEvent);
0088
0089   fEbeamCumul += fParticleGun->GetParticleEnergy();
0090 }
0091
0092 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......