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PrimaryGeneratorAction.cc
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29 // $Id: PrimaryGeneratorAction.cc 66995 2013-01-29 14:46:45Z gcosmo $
30 //
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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 
46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
47 
48 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
49 :fDetector(det)
50 {
51  fParticleGun = new G4ParticleGun(1);
52  G4ParticleDefinition* particle
53  = G4ParticleTable::GetParticleTable()->FindParticle("proton");
54  fParticleGun->SetParticleDefinition(particle);
55  fParticleGun->SetParticleEnergy(160*MeV);
56  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
57 
58  fRndmBeam = 0.;
59  fEbeamCumul = 0.;
60 
61  //create a messenger for this class
62  fGunMessenger = new PrimaryGeneratorMessenger(this);
63 }
64 
65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
66 
67 PrimaryGeneratorAction::~PrimaryGeneratorAction()
68 {
69  delete fParticleGun;
70  delete fGunMessenger;
71 }
72 
73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
74 
75 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
76 {
77  //this function is called at the begining of event
78  //
79  G4double x0 = -0.5*(fDetector->GetWorldSizeX());
80  G4double y0 = 0.*cm, z0 = 0.*cm;
81 
82  //randomize the beam, if requested.
83  //
84  if (fRndmBeam > 0.)
85  {
86  if (fRndmBeam > fDetector->GetAbsorSizeYZ())
87  fRndmBeam = fDetector->GetAbsorSizeYZ();
88  G4double rbeam = 0.5*fRndmBeam;
89  y0 = (2*G4UniformRand()-1.)*rbeam;
90  z0 = (2*G4UniformRand()-1.)*rbeam;
91  }
92  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
93  fParticleGun->GeneratePrimaryVertex(anEvent);
94 
95  fEbeamCumul += fParticleGun->GetParticleEnergy();
96 }
97 
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99 
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