Geant4  10.03.p03
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PrimaryGeneratorGun1.cc
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30 // $Id: PrimaryGeneratorGun1.cc 68734 2013-04-05 09:47:02Z gcosmo $
31 //
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34 
35 #include "PrimaryGeneratorGun1.hh"
36 
37 #include "G4Event.hh"
38 #include "G4ParticleGun.hh"
39 #include "G4ParticleTable.hh"
40 #include "G4ParticleDefinition.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4PhysicalConstants.hh"
43 #include "Randomize.hh"
44 
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46 
48  : G4VUserPrimaryGeneratorAction(), fParticleGun(0)
49 {
50  // default particle kinematic
51  //
52  G4int n_particle = 1;
53  fParticleGun = new G4ParticleGun(n_particle);
54 
55  G4ParticleDefinition* particle
57  fParticleGun->SetParticleDefinition(particle);
58  fParticleGun->SetParticleEnergy(1*eV);
59  fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., 0.));
60 }
61 
62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
63 
65 {
66  delete fParticleGun;
67 }
68 
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70 
72 {
73  //this function is called at the begining of event
74  //
75  //distribution uniform in solid angle
76  //
77  G4double cosTheta = 2*G4UniformRand() - 1., phi = twopi*G4UniformRand();
78  G4double sinTheta = std::sqrt(1. - cosTheta*cosTheta);
79  G4double ux = sinTheta*std::cos(phi),
80  uy = sinTheta*std::sin(phi),
81  uz = cosTheta;
82 
83  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,uz));
84  fParticleGun->GeneratePrimaryVertex(anEvent);
85 }
86 
87 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
CLHEP::Hep3Vector G4ThreeVector
virtual void GeneratePrimaries(G4Event *)
void SetParticleMomentumDirection(G4ParticleMomentum aMomentumDirection)
int G4int
Definition: G4Types.hh:78
virtual void GeneratePrimaryVertex(G4Event *evt)
static constexpr double twopi
Definition: G4SIunits.hh:76
void SetParticlePosition(G4ThreeVector aPosition)
#define G4UniformRand()
Definition: Randomize.hh:97
static constexpr double eV
Definition: G4SIunits.hh:215
void SetParticleEnergy(G4double aKineticEnergy)
static G4ParticleTable * GetParticleTable()
double G4double
Definition: G4Types.hh:76
void SetParticleDefinition(G4ParticleDefinition *aParticleDefinition)