Geant4 Cross Reference

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Geant4/examples/extended/eventgenerator/particleGun/src/PrimaryGeneratorAction0.cc

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 25 //
 26 /// \file eventgenerator/particleGun/src/PrimaryGeneratorAction0.cc
 27 /// \brief Implementation of the PrimaryGeneratorAction0 class
 28 //
 29 //
 30 //
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 33 
 34 #include "PrimaryGeneratorAction0.hh"
 35 
 36 #include "PrimaryGeneratorAction.hh"
 37 
 38 #include "G4Event.hh"
 39 #include "G4ParticleGun.hh"
 40 #include "G4SystemOfUnits.hh"
 41 #include "Randomize.hh"
 42 
 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 44 
 45 PrimaryGeneratorAction0::PrimaryGeneratorAction0(G4ParticleGun* gun) : fParticleGun(gun)
 46 {
 47   // solid angle
 48   //
 49   G4double alphaMin = 0 * deg;  // alpha in [0,pi]
 50   G4double alphaMax = 60 * deg;
 51   fCosAlphaMin = std::cos(alphaMin);
 52   fCosAlphaMax = std::cos(alphaMax);
 53 
 54   fPsiMin = 0 * deg;  // psi in [0, 2*pi]
 55   fPsiMax = 360 * deg;
 56 }
 57 
 58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 59 
 60 void PrimaryGeneratorAction0::GeneratePrimaries(G4Event* anEvent)
 61 {
 62   // vertex position fixed
 63   //
 64   G4double x0 = 0 * mm, y0 = 0 * mm, z0 = 0 * mm;
 65   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
 66 
 67   // direction uniform in solid angle
 68   //
 69   G4double cosAlpha = fCosAlphaMin - G4UniformRand() * (fCosAlphaMin - fCosAlphaMax);
 70   G4double sinAlpha = std::sqrt(1. - cosAlpha * cosAlpha);
 71   G4double psi = fPsiMin + G4UniformRand() * (fPsiMax - fPsiMin);
 72 
 73   G4double ux = sinAlpha * std::cos(psi), uy = sinAlpha * std::sin(psi), uz = cosAlpha;
 74 
 75   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux, uy, uz));
 76 
 77   fParticleGun->GeneratePrimaryVertex(anEvent);
 78 }
 79 
 80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 81