Geant4 Cross Reference |
1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 26 /// \file eventgenerator/particleGun/src/Prima 27 /// \brief Implementation of the PrimaryGenera 28 // 29 // 30 // 31 //....oooOO0OOooo........oooOO0OOooo........oo 32 //....oooOO0OOooo........oooOO0OOooo........oo 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........oo 44 45 PrimaryGeneratorAction0::PrimaryGeneratorActio 46 { 47 // solid angle 48 // 49 G4double alphaMin = 0 * deg; // alpha in [0 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........oo 59 60 void PrimaryGeneratorAction0::GeneratePrimarie 61 { 62 // vertex position fixed 63 // 64 G4double x0 = 0 * mm, y0 = 0 * mm, z0 = 0 * 65 fParticleGun->SetParticlePosition(G4ThreeVec 66 67 // direction uniform in solid angle 68 // 69 G4double cosAlpha = fCosAlphaMin - G4Uniform 70 G4double sinAlpha = std::sqrt(1. - cosAlpha 71 G4double psi = fPsiMin + G4UniformRand() * ( 72 73 G4double ux = sinAlpha * std::cos(psi), uy = 74 75 fParticleGun->SetParticleMomentumDirection(G 76 77 fParticleGun->GeneratePrimaryVertex(anEvent) 78 } 79 80 //....oooOO0OOooo........oooOO0OOooo........oo 81