1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: PrimaryGeneratorAction.cc,v 1.1 2007/01/19 17:20:27 maire Exp $ |
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27 | // GEANT4 tag $Name: $ |
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28 | // |
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29 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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30 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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31 | |
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32 | #include "PrimaryGeneratorAction.hh" |
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33 | |
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34 | #include "DetectorConstruction.hh" |
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35 | #include "PrimaryGeneratorMessenger.hh" |
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36 | |
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37 | #include "G4Event.hh" |
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38 | #include "G4ParticleGun.hh" |
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39 | #include "G4ParticleTable.hh" |
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40 | #include "G4ParticleDefinition.hh" |
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41 | #include "Randomize.hh" |
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42 | |
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43 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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44 | |
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45 | PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) |
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46 | :detector(det) |
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47 | { |
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48 | particleGun = new G4ParticleGun(1); |
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49 | G4ParticleDefinition* particle |
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50 | = G4ParticleTable::GetParticleTable()->FindParticle("gamma"); |
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51 | particleGun->SetParticleDefinition(particle); |
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52 | particleGun->SetParticleEnergy(1.25*MeV); |
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53 | particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.)); |
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54 | |
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55 | rBeam = 1.; |
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56 | |
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57 | //create a messenger for this class |
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58 | gunMessenger = new PrimaryGeneratorMessenger(this); |
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59 | } |
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60 | |
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61 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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62 | |
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63 | PrimaryGeneratorAction::~PrimaryGeneratorAction() |
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64 | { |
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65 | delete particleGun; |
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66 | delete gunMessenger; |
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67 | } |
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68 | |
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69 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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70 | |
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71 | void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent) |
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72 | { |
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73 | //this function is called at the begining of event |
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74 | // |
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75 | G4double z0 = -0.5*(detector->GetTotalThickness()); |
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76 | G4double x0 = 0.*cm, y0 = 0.*cm; |
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77 | |
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78 | //beam width |
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79 | // |
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80 | if (rBeam > 0.) |
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81 | { |
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82 | G4double beam = rBeam*(detector->GetWallRadius()); |
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83 | G4double r = beam*std::sqrt(G4UniformRand()); |
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84 | G4double theta = twopi*G4UniformRand(); |
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85 | x0 = r*std::cos(theta); |
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86 | y0 = r*std::sin(theta); |
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87 | } |
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88 | particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0)); |
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89 | particleGun->GeneratePrimaryVertex(anEvent); |
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90 | } |
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91 | |
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92 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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93 | |
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