| Geant4 Cross Reference |
1 //
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24 // ********************************************************************
25
26 #include "PrimaryGeneratorAction.hh"
27
28 #include "ChemistryWorld.hh"
29 #include "DetectorConstruction.hh"
30
31 #include "G4Electron.hh"
32 #include "G4Event.hh"
33 #include "G4ParticleDefinition.hh"
34 #include "G4ParticleGun.hh"
35 #include "G4ParticleTable.hh"
36 #include "G4SystemOfUnits.hh"
37
38 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
39
40 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* pDet)
41 : G4VUserPrimaryGeneratorAction(), fpDetector(pDet)
42 {
43 fpMessenger = std::make_unique<PrimaryGeneratorMessenger>(this);
44 fParticleGun = std::make_unique<G4SingleParticleSource>();
45 G4ParticleDefinition* particle = G4Electron::Definition();
46 fParticleGun->SetParticleDefinition(particle);
47 fParticleGun->SetNumberOfParticles(1000000); // by user
48
49 auto pPosDist = fParticleGun->GetPosDist();
50 pPosDist->SetPosDisType("Plane");
51 pPosDist->SetPosDisShape("Square");
52 auto faceSiez = fpDetector->GetChemistryWorld()->GetChemistryBoundary()->halfSideLengthInY();
53 pPosDist->SetCentreCoords(G4ThreeVector(0, 0, -faceSiez));
54 pPosDist->SetHalfX(faceSiez);
55 pPosDist->SetHalfY(faceSiez);
56
57 auto pAngleDist = fParticleGun->GetAngDist();
58 pAngleDist->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
59
60 auto pEnergyDis = fParticleGun->GetEneDist();
61 pEnergyDis->SetMonoEnergy(0.9999 * MeV);
62 }
63
64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
65
66 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
67 {
68 G4ParticleDefinition* particle = fParticleGun->GetParticleDefinition();
69 auto NumberOfParticlesToBeGenerated = fParticleGun->GetNumberOfParticles();
70 auto pPosDist = fParticleGun->GetPosDist();
71 auto pAngleDist = fParticleGun->GetAngDist();
72 auto pEnDist = fParticleGun->GetEneDist();
73 auto rnd = fParticleGun->GetBiasRndm();
74 auto charge = particle->GetPDGCharge();
75
76 for (G4int i = 0; i < NumberOfParticlesToBeGenerated; i++) {
77 auto angle = pAngleDist->GenerateOne();
78 auto energy = pEnDist->GenerateOne(particle);
79 auto pos = pPosDist->GenerateOne();
80 auto mass = particle->GetPDGMass();
81 auto p = new G4PrimaryParticle(particle);
82 auto vertex = new G4PrimaryVertex(pos, 0);
83 p->SetKineticEnergy(energy);
84 p->SetMass(mass);
85 p->SetMomentumDirection(angle);
86 p->SetCharge(charge);
87 p->SetPolarization(0., 0., 0.);
88
89 G4double weight = pEnDist->GetWeight() * rnd->GetBiasWeight();
90 p->SetWeight(weight);
91 vertex->SetPrimary(p);
92 anEvent->AddPrimaryVertex(vertex);
93 }
94 }
95
96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
97