Geant4  10.02.p02
PrimaryGenerator.cc
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30 // $Id: PrimaryGenerator.cc 89705 2015-04-27 17:15:27Z maire $
31 //
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34 
35 #include "PrimaryGenerator.hh"
36 
37 #include "G4Event.hh"
38 #include "G4ParticleTable.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "G4PrimaryParticle.hh"
41 #include "G4PrimaryVertex.hh"
42 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "Randomize.hh"
45 
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50 { }
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55 { }
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60 {
61  //vertex A uniform on a cylinder
62  //
63  const G4double r = 2*mm;
64  const G4double zmax = 8*mm;
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  G4ThreeVector positionA(r*ux,r*uy,z);
71  G4double timeA = 0*s;
72  //
73  G4PrimaryVertex* vertexA = new G4PrimaryVertex(positionA, timeA);
74 
75  //particle 1 at vertex A
76  //
77  G4ParticleDefinition* particleDefinition
79  G4PrimaryParticle* particle1 = new G4PrimaryParticle(particleDefinition);
80  particle1->SetMomentumDirection(G4ThreeVector(ux,uy,0));
81  particle1->SetKineticEnergy(1*MeV);
82  //
83  vertexA->SetPrimary(particle1);
84  event->AddPrimaryVertex(vertexA);
85 
86  //vertex (B) symetric to vertex A
87  //
88  alpha += pi;
89  ux = std::cos(alpha);
90  uy = std::sin(alpha);
91  G4ThreeVector positionB(r*ux,r*uy,z);
92  G4double timeB = 1*s;
93  //
94  G4PrimaryVertex* vertexB = new G4PrimaryVertex(positionB, timeB);
95 
96  //particles 2 and 3 at vertex B
97  //
98  const G4double dalpha = 10*deg;
99  ux = std::cos(alpha + dalpha);
100  uy = std::sin(alpha + dalpha);
101  G4PrimaryParticle* particle2 = new G4PrimaryParticle(particleDefinition);
102  particle2->SetMomentumDirection(G4ThreeVector(ux,uy,0));
103  particle2->SetKineticEnergy(1*keV);
104  //
105  ux = std::cos(alpha - dalpha);
106  uy = std::sin(alpha - dalpha);
107  G4PrimaryParticle* particle3 = new G4PrimaryParticle(particleDefinition);
108  particle3->SetMomentumDirection(G4ThreeVector(ux,uy,0));
109  particle3->SetKineticEnergy(1*GeV);
110  //
111  vertexB->SetPrimary(particle2);
112  vertexB->SetPrimary(particle3);
113  event->AddPrimaryVertex(vertexB);
114 }
115 
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static const double MeV
Definition: G4SIunits.hh:211
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
CLHEP::Hep3Vector G4ThreeVector
G4double z
Definition: TRTMaterials.hh:39
void SetKineticEnergy(G4double eKin)
static const double s
Definition: G4SIunits.hh:168
Definition of the PrimaryGenerator class.
#define G4UniformRand()
Definition: Randomize.hh:97
static const double deg
Definition: G4SIunits.hh:151
static const double twopi
Definition: G4SIunits.hh:75
static const double GeV
Definition: G4SIunits.hh:214
static const double pi
Definition: G4SIunits.hh:74
static G4ParticleTable * GetParticleTable()
void SetMomentumDirection(const G4ThreeVector &p)
void SetPrimary(G4PrimaryParticle *pp)
static const double keV
Definition: G4SIunits.hh:213
virtual void GeneratePrimaryVertex(G4Event *)
double G4double
Definition: G4Types.hh:76
static const G4double alpha
static const double mm
Definition: G4SIunits.hh:114