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PrimaryGeneratorAction.cc
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30 // $Id$
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36 
37 #include "PrimaryGeneratorAction.hh"
38 
39 #include "DetectorConstruction.hh"
40 #include "PrimaryGeneratorMessenger.hh"
41 
42 #include "G4Event.hh"
43 #include "G4ParticleTable.hh"
44 #include "G4ParticleDefinition.hh"
45 #include "G4SystemOfUnits.hh"
46 #include "Randomize.hh"
47 
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50 PrimaryGeneratorAction::PrimaryGeneratorAction(
51  DetectorConstruction* DC)
52 :fDetector(DC)
53 {
54  fParticleGun = new G4ParticleGun(1);
55  SetDefaultKinematic(1);
56  fRndmBeam = 0.;
57 
58  //create a messenger for this class
59  fGunMessenger = new PrimaryGeneratorMessenger(this);
60 }
61 
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63 
64 PrimaryGeneratorAction::~PrimaryGeneratorAction()
65 {
66  delete fParticleGun;
67  delete fGunMessenger;
68 }
69 
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72 void PrimaryGeneratorAction::SetDefaultKinematic(G4int front)
73 {
74  G4ParticleDefinition* particle
75  = G4ParticleTable::GetParticleTable()->FindParticle("e-");
76  fParticleGun->SetParticleDefinition(particle);
77  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
78  fParticleGun->SetParticleEnergy(100*MeV);
79  G4double position = 0.*cm;
80  if (front) position = -0.5*(fDetector->GetSize());
81  fParticleGun->SetParticlePosition(G4ThreeVector(position,0.*cm,0.*cm));
82 }
83 
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86 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
87 {
88  //this function is called at the begining of event
89  //
90  //randomize the beam, if requested.
91  if (fRndmBeam > 0.)
92  {
93  G4ThreeVector oldPosition = fParticleGun->GetParticlePosition();
94  G4double rbeam = 0.5*(fDetector->GetSize())*fRndmBeam;
95  G4double x0 = oldPosition.x();
96  G4double y0 = oldPosition.y() + (2*G4UniformRand()-1.)*rbeam;
97  G4double z0 = oldPosition.z() + (2*G4UniformRand()-1.)*rbeam;
98  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
99  fParticleGun->GeneratePrimaryVertex(anEvent);
100  fParticleGun->SetParticlePosition(oldPosition);
101  }
102  else fParticleGun->GeneratePrimaryVertex(anEvent);
103 }
104 
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