TestEm1/src/PrimaryGeneratorAction.cc

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0026 /// \file electromagnetic/TestEm1/src/PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028 //
0029 //
0030
0031 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0032 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0033
0034 #include "PrimaryGeneratorAction.hh"
0035
0036 #include "DetectorConstruction.hh"
0037 #include "PrimaryGeneratorMessenger.hh"
0038
0039 #include "G4Event.hh"
0040 #include "G4ParticleDefinition.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) : fDetector(det)
0048 {
0049   fParticleGun = new G4ParticleGun(1);
0050   SetDefaultKinematic(1);
0051
0052   // create a messenger for this class
0053   fGunMessenger = new PrimaryGeneratorMessenger(this);
0054 }
0055
0056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0057
0058 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0059 {
0060   delete fParticleGun;
0061   delete fGunMessenger;
0062 }
0063
0064 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0065
0066 void PrimaryGeneratorAction::SetDefaultKinematic(G4int front)
0067 {
0068   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
0069   fParticleGun->SetParticleDefinition(particle);
0070   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0071   fParticleGun->SetParticleEnergy(100 * MeV);
0072   G4double position = 0. * cm;
0073   if (front) position = -0.4999 * (fDetector->GetSize());
0074   fParticleGun->SetParticlePosition(G4ThreeVector(position, 0. * cm, 0. * cm));
0075 }
0076
0077 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0078
0079 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0080 {
0081   // this function is called at the begining of event
0082   //
0083   // randomize the beam, if requested.
0084   if (fRndmBeam > 0.) {
0085     G4ThreeVector oldPosition = fParticleGun->GetParticlePosition();
0086     G4double rbeam = 0.5 * (fDetector->GetSize()) * fRndmBeam;
0087     G4double x0 = oldPosition.x();
0088     G4double y0 = oldPosition.y() + (2 * G4UniformRand() - 1.) * rbeam;
0089     G4double z0 = oldPosition.z() + (2 * G4UniformRand() - 1.) * rbeam;
0090     fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0091     fParticleGun->GeneratePrimaryVertex(anEvent);
0092     fParticleGun->SetParticlePosition(oldPosition);
0093   }
0094   else
0095     fParticleGun->GeneratePrimaryVertex(anEvent);
0096 }
0097
0098 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......