TestEm7/src/PrimaryGeneratorAction.cc

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0026 /// \file electromagnetic/TestEm7/src/PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028 //
0029 //
0030 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0031 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0032
0033 #include "PrimaryGeneratorAction.hh"
0034
0035 #include "DetectorConstruction.hh"
0036 #include "PrimaryGeneratorMessenger.hh"
0037
0038 #include "G4Event.hh"
0039 #include "G4ParticleDefinition.hh"
0040 #include "G4ParticleGun.hh"
0041 #include "G4ParticleTable.hh"
0042 #include "G4SystemOfUnits.hh"
0043 #include "Randomize.hh"
0044
0045 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0046
0047 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
0048   : G4VUserPrimaryGeneratorAction(),
0049     fParticleGun(0),
0050     fDetector(det),
0051     fRndmBeam(0),
0052     fEbeamCumul(0),
0053     fGunMessenger(0)
0054 {
0055   fParticleGun = new G4ParticleGun(1);
0056   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("proton");
0057   fParticleGun->SetParticleDefinition(particle);
0058   fParticleGun->SetParticleEnergy(160 * MeV);
0059   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0060
0061   // create a messenger for this class
0062   fGunMessenger = new PrimaryGeneratorMessenger(this);
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0068 {
0069   delete fParticleGun;
0070   delete fGunMessenger;
0071 }
0072
0073 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0074
0075 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0076 {
0077   // this function is called at the begining of event
0078   //
0079   G4double x0 = -0.5 * (fDetector->GetWorldSizeX());
0080   G4double y0 = 0. * cm, z0 = 0. * cm;
0081
0082   // randomize the beam, if requested.
0083   //
0084   if (fRndmBeam > 0.) {
0085     if (fRndmBeam > fDetector->GetAbsorSizeYZ()) fRndmBeam = fDetector->GetAbsorSizeYZ();
0086     G4double rbeam = 0.5 * fRndmBeam;
0087     y0 = (2 * G4UniformRand() - 1.) * rbeam;
0088     z0 = (2 * G4UniformRand() - 1.) * rbeam;
0089   }
0090   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0091   fParticleGun->GeneratePrimaryVertex(anEvent);
0092
0093   fEbeamCumul += fParticleGun->GetParticleEnergy();
0094 }
0095
0096 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......