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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 "PrimaryGeneratorAction3.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........oo
47
48 PrimaryGeneratorAction3::PrimaryGeneratorActio
49 {
50 // direction
51 //
52 G4double theta = 90 * deg, phi = 45 * deg;
53 fNewUz = G4ThreeVector(std::sin(theta) * std
54 std::cos(theta));
55
56 fAlphaMax = 15 * deg;
57 }
58
59 //....oooOO0OOooo........oooOO0OOooo........oo
60
61 void PrimaryGeneratorAction3::GeneratePrimarie
62 {
63 // particle direction uniform around fNewUz
64 //
65 // 1- in World frame
66 // cosAlpha uniform in [cos(0), cos(fAlphaMa
67 G4double cosAlpha = 1. - G4UniformRand() * (
68 G4double sinAlpha = std::sqrt(1. - cosAlpha
69 G4double psi = twopi * G4UniformRand(); //
70 G4ThreeVector dir(sinAlpha * std::cos(psi),
71
72 // 2- rotate dir (rotateUz transforms uz t
73 dir.rotateUz(fNewUz);
74
75 fParticleGun->SetParticleMomentumDirection(d
76
77 // set energy
78 //
79 fParticleGun->SetParticleEnergy(1 * MeV);
80
81 // create vertex
82 //
83 fParticleGun->GeneratePrimaryVertex(anEvent)
84 }
85
86 //....oooOO0OOooo........oooOO0OOooo........oo
87