Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/examples/extended/eventgenerator/userPrimaryGenerator/src/PrimaryGenerator.cc

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  1 //
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 25 //
 26 /// \file PrimaryGenerator.cc
 27 /// \brief Implementation of the PrimaryGenerator1 class
 28 //
 29 //
 30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 
 33 #include "PrimaryGenerator.hh"
 34 
 35 #include "G4Event.hh"
 36 #include "G4ParticleDefinition.hh"
 37 #include "G4ParticleTable.hh"
 38 #include "G4PhysicalConstants.hh"
 39 #include "G4PrimaryParticle.hh"
 40 #include "G4PrimaryVertex.hh"
 41 #include "G4SystemOfUnits.hh"
 42 #include "Randomize.hh"
 43 
 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 45 
 46 void PrimaryGenerator::GeneratePrimaryVertex(G4Event* event)
 47 {
 48   // vertex A uniform on a cylinder
 49   //
 50   const G4double r = 2 * mm;
 51   const G4double zmax = 8 * mm;
 52   //
 53   G4double alpha = twopi * G4UniformRand();  // alpha uniform in (0, 2*pi)
 54   G4double ux = std::cos(alpha);
 55   G4double uy = std::sin(alpha);
 56   G4double z = zmax * (2 * G4UniformRand() - 1);  // z uniform in (-zmax, +zmax)
 57   G4ThreeVector positionA(r * ux, r * uy, z);
 58   G4double timeA = 0 * s;
 59   //
 60   G4PrimaryVertex* vertexA = new G4PrimaryVertex(positionA, timeA);
 61 
 62   // particle 1 at vertex A
 63   //
 64   G4ParticleDefinition* particleDefinition =
 65     G4ParticleTable::GetParticleTable()->FindParticle("geantino");
 66   G4PrimaryParticle* particle1 = new G4PrimaryParticle(particleDefinition);
 67   particle1->SetMomentumDirection(G4ThreeVector(ux, uy, 0));
 68   particle1->SetKineticEnergy(1 * MeV);
 69   //
 70   vertexA->SetPrimary(particle1);
 71   event->AddPrimaryVertex(vertexA);
 72 
 73   // vertex (B) symetric to vertex A
 74   //
 75   alpha += pi;
 76   ux = std::cos(alpha);
 77   uy = std::sin(alpha);
 78   G4ThreeVector positionB(r * ux, r * uy, z);
 79   G4double timeB = 1 * s;
 80   //
 81   G4PrimaryVertex* vertexB = new G4PrimaryVertex(positionB, timeB);
 82 
 83   // particles 2 and 3 at vertex B
 84   //
 85   const G4double dalpha = 10 * deg;
 86   ux = std::cos(alpha + dalpha);
 87   uy = std::sin(alpha + dalpha);
 88   G4PrimaryParticle* particle2 = new G4PrimaryParticle(particleDefinition);
 89   particle2->SetMomentumDirection(G4ThreeVector(ux, uy, 0));
 90   particle2->SetKineticEnergy(1 * keV);
 91   //
 92   ux = std::cos(alpha - dalpha);
 93   uy = std::sin(alpha - dalpha);
 94   G4PrimaryParticle* particle3 = new G4PrimaryParticle(particleDefinition);
 95   particle3->SetMomentumDirection(G4ThreeVector(ux, uy, 0));
 96   particle3->SetKineticEnergy(1 * GeV);
 97   //
 98   vertexB->SetPrimary(particle2);
 99   vertexB->SetPrimary(particle3);
100   event->AddPrimaryVertex(vertexB);
101 }
102 
103 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
104