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25 //
26 /// \file electromagnetic/TestEm7/src/PrimaryGeneratorAction.cc
27 /// \brief Implementation of the PrimaryGeneratorAction class
28 //
29 //
30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32
33 #include "PrimaryGeneratorAction.hh"
34
35 #include "DetectorConstruction.hh"
36 #include "PrimaryGeneratorMessenger.hh"
37
38 #include "G4Event.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "G4ParticleGun.hh"
41 #include "G4ParticleTable.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "Randomize.hh"
44
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
46
47 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
48 : G4VUserPrimaryGeneratorAction(),
49 fParticleGun(0),
50 fDetector(det),
51 fRndmBeam(0),
52 fEbeamCumul(0),
53 fGunMessenger(0)
54 {
55 fParticleGun = new G4ParticleGun(1);
56 G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("proton");
57 fParticleGun->SetParticleDefinition(particle);
58 fParticleGun->SetParticleEnergy(160 * MeV);
59 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 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 if (fRndmBeam > fDetector->GetAbsorSizeYZ()) fRndmBeam = fDetector->GetAbsorSizeYZ();
86 G4double rbeam = 0.5 * 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 fEbeamCumul += fParticleGun->GetParticleEnergy();
94 }
95
96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
97