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 "PrimaryGeneratorMessenger.hh"
38 
39 #include "G4Event.hh"
40 #include "G4ParticleGun.hh"
41 #include "G4ParticleTable.hh"
42 #include "G4ParticleDefinition.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "Randomize.hh"
45 
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48 PrimaryGeneratorAction::PrimaryGeneratorAction(
49  DetectorConstruction* DC)
50 :fDetector(DC)
51 {
52  fParticleGun = new G4ParticleGun(1);
53  G4ParticleDefinition* particle
54  = G4ParticleTable::GetParticleTable()->FindParticle("gamma");
55  fParticleGun->SetParticleDefinition(particle);
56  fParticleGun->SetParticleEnergy(100*TeV);
57  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
58 
59  fRndmBeam = 0.;
60 
61  //create a messenger for this class
62  fGunMessenger = new PrimaryGeneratorMessenger(this);
63 }
64 
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66 
67 PrimaryGeneratorAction::~PrimaryGeneratorAction()
68 {
69  delete fParticleGun;
70  delete fGunMessenger;
71 }
72 
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75 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
76 {
77  //this function is called at the begining of event
78  //
79  G4double x0 = -0.5*(fDetector->GetSize());
80  G4double y0 = 0.*cm, z0 = 0.*cm;
81 
82  //randomize the beam, if requested.
83  //
84  if (fRndmBeam > 0.)
85  {
86  G4double rbeam = 0.5*(fDetector->GetSize())*fRndmBeam;
87  y0 = (2*G4UniformRand()-1.)*rbeam;
88  z0 = (2*G4UniformRand()-1.)*rbeam;
89  }
90  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
91  fParticleGun->GeneratePrimaryVertex(anEvent);
92 }
93 
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