| 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: geant4-09-04-beta-01 $ |
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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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