Geant4  9.6.p02
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PrimaryGeneratorAction.cc
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29 // $Id$
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33 
34 #include "PrimaryGeneratorAction.hh"
35 
36 #include "DetectorConstruction.hh"
37 #include "G4Event.hh"
38 #include "G4ParticleTable.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "G4SystemOfUnits.hh"
41 
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44 PrimaryGeneratorAction::PrimaryGeneratorAction (DetectorConstruction* det)
45 :fDetector(det)
46 {
47  G4int n_particle = 1;
48  fParticleGun = new G4ParticleGun(n_particle);
49 
50  G4ParticleDefinition* particle
51  = G4ParticleTable::GetParticleTable()->FindParticle("e-");
52  fParticleGun->SetParticleDefinition(particle);
53  fParticleGun->SetParticleEnergy(5.*GeV);
54  fParticleGun->SetParticlePosition(fInitPos = G4ThreeVector(-1*cm,-1*cm,-1*cm));
55  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
56 }
57 
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60 PrimaryGeneratorAction::~PrimaryGeneratorAction()
61 {
62  delete fParticleGun;
63 }
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67 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
68 {
69  //this function is called at the begin of event
70  //
71  if (fParticleGun->GetParticlePosition() == fInitPos) {
72  G4double position = -0.5*(fDetector->GetfullLength());
73  fParticleGun->SetParticlePosition(G4ThreeVector(0.*cm,0.*cm,position));
74  }
75  fParticleGun->GeneratePrimaryVertex(anEvent);
76 }
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