Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/examples/extended/eventgenerator/particleGun/src/PrimaryGeneratorAction3.cc

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 25 //
 26 /// \file eventgenerator/particleGun/src/PrimaryGeneratorAction3.cc
 27 /// \brief Implementation of the PrimaryGeneratorAction3 class
 28 //
 29 //
 30 //
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 33 
 34 #include "PrimaryGeneratorAction3.hh"
 35 
 36 #include "PrimaryGeneratorAction.hh"
 37 
 38 #include "G4Event.hh"
 39 #include "G4ParticleDefinition.hh"
 40 #include "G4ParticleGun.hh"
 41 #include "G4ParticleTable.hh"
 42 #include "G4PhysicalConstants.hh"
 43 #include "G4SystemOfUnits.hh"
 44 #include "Randomize.hh"
 45 
 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 47 
 48 PrimaryGeneratorAction3::PrimaryGeneratorAction3(G4ParticleGun* gun) : fParticleGun(gun)
 49 {
 50   // direction
 51   //
 52   G4double theta = 90 * deg, phi = 45 * deg;
 53   fNewUz = G4ThreeVector(std::sin(theta) * std::cos(phi), std::sin(theta) * std::sin(phi),
 54                          std::cos(theta));
 55 
 56   fAlphaMax = 15 * deg;
 57 }
 58 
 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 60 
 61 void PrimaryGeneratorAction3::GeneratePrimaries(G4Event* anEvent)
 62 {
 63   // particle direction uniform around fNewUz axis
 64   //
 65   // 1- in World frame
 66   // cosAlpha uniform in [cos(0), cos(fAlphaMax)]
 67   G4double cosAlpha = 1. - G4UniformRand() * (1. - std::cos(fAlphaMax));
 68   G4double sinAlpha = std::sqrt(1. - cosAlpha * cosAlpha);
 69   G4double psi = twopi * G4UniformRand();  // psi uniform in [0, 2*pi]
 70   G4ThreeVector dir(sinAlpha * std::cos(psi), sinAlpha * std::sin(psi), cosAlpha);
 71 
 72   // 2- rotate dir   (rotateUz transforms uz to fNewUz)
 73   dir.rotateUz(fNewUz);
 74 
 75   fParticleGun->SetParticleMomentumDirection(dir);
 76 
 77   // set energy
 78   //
 79   fParticleGun->SetParticleEnergy(1 * MeV);
 80 
 81   // create vertex
 82   //
 83   fParticleGun->GeneratePrimaryVertex(anEvent);
 84 }
 85 
 86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 87