Geant4  9.6.p02
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PrimaryGeneratorAction1.cc
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30 // $Id$
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34 
35 #include "PrimaryGeneratorAction1.hh"
36 #include "PrimaryGeneratorAction.hh"
37 
38 #include "G4Event.hh"
39 #include "G4ParticleGun.hh"
40 #include "G4ParticleTable.hh"
41 #include "G4ParticleDefinition.hh"
42 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "Randomize.hh"
45 
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48 PrimaryGeneratorAction1::PrimaryGeneratorAction1(G4ParticleGun* gun)
49 : fParticleGun(gun)
50 { }
51 
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54 PrimaryGeneratorAction1::~PrimaryGeneratorAction1()
55 { }
56 
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58 
59 void PrimaryGeneratorAction1::GeneratePrimaries(G4Event* anEvent)
60 {
61  const G4double r = 2*mm;
62  const G4double zmax = 8*mm;
63 
64  //vertex 1 uniform on cylinder
65  //
66  G4double alpha = twopi*G4UniformRand(); //alpha uniform in (0, 2*pi)
67  G4double ux = std::cos(alpha);
68  G4double uy = std::sin(alpha);
69  G4double z = zmax*(2*G4UniformRand() - 1); //z uniform in (-zmax, +zmax)
70 
71  fParticleGun->SetParticlePosition(G4ThreeVector(r*ux,r*uy,z));
72  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,0));
73  fParticleGun->SetParticleEnergy(1*MeV);
74  fParticleGun->GeneratePrimaryVertex(anEvent);
75 
76  //vertex 2 at opposite
77  //
78  alpha += pi;
79  ux = std::cos(alpha);
80  uy = std::sin(alpha);
81  fParticleGun->SetParticlePosition(G4ThreeVector(r*ux,r*uy,z));
82 
83  //particle 2 at vertex 2
84  //
85  const G4double dalpha = 10*deg;
86  ux = std::cos(alpha + dalpha);
87  uy = std::sin(alpha + dalpha);
88 
89  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,0));
90  fParticleGun->SetParticleEnergy(1*keV);
91  fParticleGun->GeneratePrimaryVertex(anEvent);
92 
93  //particle 3 at vertex 2
94  //
95  ux = std::cos(alpha - dalpha);
96  uy = std::sin(alpha - dalpha);
97 
98  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,0));
99  fParticleGun->SetParticleEnergy(1*GeV);
100  fParticleGun->GeneratePrimaryVertex(anEvent);
101 }
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