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25 //
26 /// \file eventgenerator/particleGun/src/PrimaryGeneratorAction1.cc
27 /// \brief Implementation of the PrimaryGeneratorAction1 class
28 //
29 //
30 //
31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
33
34 #include "PrimaryGeneratorAction1.hh"
35
36 #include "PrimaryGeneratorAction.hh"
37
38 #include "G4Event.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "G4ParticleGun.hh"
41 #include "G4ParticleTable.hh"
42 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "Randomize.hh"
45
46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
47
48 PrimaryGeneratorAction1::PrimaryGeneratorAction1(G4ParticleGun* gun) : fParticleGun(gun) {}
49
50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
51
52 void PrimaryGeneratorAction1::GeneratePrimaries(G4Event* anEvent)
53 {
54 const G4double r = 2 * mm;
55 const G4double zmax = 8 * mm;
56
57 // vertex 1 uniform on cylinder
58 //
59 G4double alpha = twopi * G4UniformRand(); // alpha uniform in (0, 2*pi)
60 G4double ux = std::cos(alpha);
61 G4double uy = std::sin(alpha);
62 G4double z = zmax * (2 * G4UniformRand() - 1); // z uniform in (-zmax, +zmax)
63
64 fParticleGun->SetParticlePosition(G4ThreeVector(r * ux, r * uy, z));
65 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux, uy, 0));
66 fParticleGun->SetParticleEnergy(1 * MeV);
67 fParticleGun->GeneratePrimaryVertex(anEvent);
68
69 // vertex 2 at opposite
70 //
71 alpha += pi;
72 ux = std::cos(alpha);
73 uy = std::sin(alpha);
74 fParticleGun->SetParticlePosition(G4ThreeVector(r * ux, r * uy, z));
75
76 // particle 2 at vertex 2
77 //
78 const G4double dalpha = 10 * deg;
79 ux = std::cos(alpha + dalpha);
80 uy = std::sin(alpha + dalpha);
81
82 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux, uy, 0));
83 fParticleGun->SetParticleEnergy(1 * keV);
84 fParticleGun->GeneratePrimaryVertex(anEvent);
85
86 // particle 3 at vertex 3 (same as vertex 2)
87 //
88 ux = std::cos(alpha - dalpha);
89 uy = std::sin(alpha - dalpha);
90
91 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux, uy, 0));
92 fParticleGun->SetParticleEnergy(1 * GeV);
93 fParticleGun->GeneratePrimaryVertex(anEvent);
94
95 // randomize time zero of anEvent
96 //
97 G4double tmin = 0 * s, tmax = 10 * s;
98 G4double t0 = tmin + (tmax - tmin) * G4UniformRand();
99 G4PrimaryVertex* aVertex = anEvent->GetPrimaryVertex();
100 while (aVertex) {
101 aVertex->SetT0(t0);
102 aVertex = aVertex->GetNext();
103 }
104 }
105
106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
107