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 "PrimaryGeneratorAction4.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 PrimaryGeneratorAction4::PrimaryGeneratorActio 49 { 50 // vertex volume 51 // 52 G4double Rmin = 2. * mm; 53 G4double Rmax = 8. * mm; 54 fRmin3 = Rmin * Rmin * Rmin; 55 fRmax3 = Rmax * Rmax * Rmax; 56 57 // opening angle 58 // 59 G4double alphaMin = 0. * deg; 60 G4double alphaMax = 60. * deg; 61 fCosAlphaMin = std::cos(alphaMin); 62 fCosAlphaMax = std::cos(alphaMax); 63 } 64 65 //....oooOO0OOooo........oooOO0OOooo........oo 66 67 void PrimaryGeneratorAction4::GeneratePrimarie 68 { 69 // vertex position uniform in spherical shel 70 // 71 G4double cosTheta = 2 * G4UniformRand() - 1; 72 G4double sinTheta = std::sqrt(1. - cosTheta 73 G4double phi = twopi * G4UniformRand(); // 74 G4ThreeVector ur(sinTheta * std::cos(phi), s 75 76 G4double R3 = fRmin3 + G4UniformRand() * (fR 77 G4double R = std::pow(R3, 1. / 3); 78 79 fParticleGun->SetParticlePosition(R * ur); 80 81 // particle direction uniform around ur 82 // 83 // 1- in World frame 84 // cosAlpha uniform in [cos(alphaMin), cos(a 85 G4double cosAlpha = fCosAlphaMin - G4Uniform 86 G4double sinAlpha = std::sqrt(1. - cosAlpha 87 G4double psi = twopi * G4UniformRand(); // 88 G4ThreeVector dir(sinAlpha * std::cos(psi), 89 90 // 2- rotate dir (rotateUz transforms uz t 91 dir.rotateUz(ur); 92 93 fParticleGun->SetParticleMomentumDirection(d 94 95 // energy 96 // 97 fParticleGun->SetParticleEnergy(1 * MeV); 98 99 // create vertex 100 // 101 fParticleGun->GeneratePrimaryVertex(anEvent) 102 } 103 //....oooOO0OOooo........oooOO0OOooo........oo 104