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1 // 1
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25 //
26 /// \file eventgenerator/particleGun/src/Prima
27 /// \brief Implementation of the PrimaryGenera
28 //
29 //
30 //
31 //....oooOO0OOooo........oooOO0OOooo........oo
32 //....oooOO0OOooo........oooOO0OOooo........oo
33
34 #include "PrimaryGeneratorAction0.hh"
35
36 #include "PrimaryGeneratorAction.hh"
37
38 #include "G4Event.hh"
39 #include "G4ParticleGun.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "Randomize.hh"
42
43 //....oooOO0OOooo........oooOO0OOooo........oo
44
45 PrimaryGeneratorAction0::PrimaryGeneratorActio
46 {
47 // solid angle
48 //
49 G4double alphaMin = 0 * deg; // alpha in [0
50 G4double alphaMax = 60 * deg;
51 fCosAlphaMin = std::cos(alphaMin);
52 fCosAlphaMax = std::cos(alphaMax);
53
54 fPsiMin = 0 * deg; // psi in [0, 2*pi]
55 fPsiMax = 360 * deg;
56 }
57
58 //....oooOO0OOooo........oooOO0OOooo........oo
59
60 void PrimaryGeneratorAction0::GeneratePrimarie
61 {
62 // vertex position fixed
63 //
64 G4double x0 = 0 * mm, y0 = 0 * mm, z0 = 0 *
65 fParticleGun->SetParticlePosition(G4ThreeVec
66
67 // direction uniform in solid angle
68 //
69 G4double cosAlpha = fCosAlphaMin - G4Uniform
70 G4double sinAlpha = std::sqrt(1. - cosAlpha
71 G4double psi = fPsiMin + G4UniformRand() * (
72
73 G4double ux = sinAlpha * std::cos(psi), uy =
74
75 fParticleGun->SetParticleMomentumDirection(G
76
77 fParticleGun->GeneratePrimaryVertex(anEvent)
78 }
79
80 //....oooOO0OOooo........oooOO0OOooo........oo
81