Geant4  9.6.p02
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PrimaryGeneratorAction.cc
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26 // $Id$
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30 
31 #include "PrimaryGeneratorAction.hh"
32 
33 #include "PrimaryGeneratorMessenger.hh"
34 #include "DetectorConstruction.hh"
35 #include "HistoManager.hh"
36 
37 #include "G4SystemOfUnits.hh"
38 #include "G4Event.hh"
39 #include "G4ParticleGun.hh"
40 #include "G4ParticleTable.hh"
41 #include "G4ParticleDefinition.hh"
42 #include "Randomize.hh"
43 
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45 
46 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det,
47  HistoManager* hist)
48 :Detector(det),histoManager(hist)
49 {
50  G4int n_particle = 1;
51  particleGun = new G4ParticleGun(n_particle);
52  SetDefaultKinematic();
53  beam = 0.*mm;
54 
55  //create a messenger for this class
56  gunMessenger = new PrimaryGeneratorMessenger(this);
57 }
58 
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60 
61 PrimaryGeneratorAction::~PrimaryGeneratorAction()
62 {
63  delete particleGun;
64  delete gunMessenger;
65 }
66 
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68 
69 void PrimaryGeneratorAction::SetDefaultKinematic()
70 {
71  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
72  G4String particleName;
73  G4ParticleDefinition* particle
74  = particleTable->FindParticle(particleName="e-");
75  particleGun->SetParticleDefinition(particle);
76  particleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
77  particleGun->SetParticleEnergy(1.*GeV);
78  G4double position = -0.5*(Detector->GetWorldSizeX());
79  particleGun->SetParticlePosition(G4ThreeVector(position,0.*mm,0.*mm));
80 }
81 
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83 
84 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
85 {
86  //this function is called at the begining of event
87  //
88  //randomize beam, if requested.
89  //
90  if (beam > 0.)
91  {
92  G4ThreeVector position = particleGun->GetParticlePosition();
93  G4double maxYZ = 0.49*(Detector->GetCalorSizeYZ());
94  G4double x0 = position.x();
95  G4double y0 = position.y() + (G4UniformRand()-0.5)*beam;
96  G4double z0 = position.z() + (G4UniformRand()-0.5)*beam;
97  if (std::abs(y0) > maxYZ) y0 = maxYZ;
98  if (std::abs(z0) > maxYZ) z0 = maxYZ;
99  particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
100  particleGun->GeneratePrimaryVertex(anEvent);
101  particleGun->SetParticlePosition(position);
102  }
103  else particleGun->GeneratePrimaryVertex(anEvent);
104 }
105 
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