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 "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........oo 47 48 PrimaryGeneratorAction3::PrimaryGeneratorActio 49 { 50 // direction 51 // 52 G4double theta = 90 * deg, phi = 45 * deg; 53 fNewUz = G4ThreeVector(std::sin(theta) * std 54 std::cos(theta)); 55 56 fAlphaMax = 15 * deg; 57 } 58 59 //....oooOO0OOooo........oooOO0OOooo........oo 60 61 void PrimaryGeneratorAction3::GeneratePrimarie 62 { 63 // particle direction uniform around fNewUz 64 // 65 // 1- in World frame 66 // cosAlpha uniform in [cos(0), cos(fAlphaMa 67 G4double cosAlpha = 1. - G4UniformRand() * ( 68 G4double sinAlpha = std::sqrt(1. - cosAlpha 69 G4double psi = twopi * G4UniformRand(); // 70 G4ThreeVector dir(sinAlpha * std::cos(psi), 71 72 // 2- rotate dir (rotateUz transforms uz t 73 dir.rotateUz(fNewUz); 74 75 fParticleGun->SetParticleMomentumDirection(d 76 77 // set energy 78 // 79 fParticleGun->SetParticleEnergy(1 * MeV); 80 81 // create vertex 82 // 83 fParticleGun->GeneratePrimaryVertex(anEvent) 84 } 85 86 //....oooOO0OOooo........oooOO0OOooo........oo 87