| 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 1.2 2006/06/29 16:43:32 gunter Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-03-cand-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("e-");
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| 51 | particleGun->SetParticleDefinition(particle);
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| 52 | particleGun->SetParticleEnergy(4*MeV);
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| 53 | particleGun->SetParticlePosition(G4ThreeVector());
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| 54 | particleGun->SetParticleMomentumDirection(G4ThreeVector(1,0,0));
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| 55 |
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| 56 | rndmBeam = true;
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| 57 |
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| 58 | //create a messenger for this class
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| 59 | gunMessenger = new PrimaryGeneratorMessenger(this);
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| 60 | }
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| 61 |
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| 62 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 63 |
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| 64 | PrimaryGeneratorAction::~PrimaryGeneratorAction()
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| 65 | {
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| 66 | delete particleGun;
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| 67 | delete gunMessenger;
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| 68 | }
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| 69 |
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| 70 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 71 |
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| 72 | void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
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| 73 | {
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| 74 | //randomize the beam, if requested.
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| 75 | //
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| 76 | if (rndmBeam)
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| 77 | {
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| 78 | //distribution uniform in solid angle
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| 79 | //
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| 80 | G4double cosTheta = 2*G4UniformRand() - 1., phi = twopi*G4UniformRand();
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| 81 | G4double sinTheta = std::sqrt(1. - cosTheta*cosTheta);
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| 82 | G4double ux = sinTheta*std::cos(phi),
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| 83 | uy = sinTheta*std::sin(phi),
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| 84 | uz = cosTheta;
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| 85 | particleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,uz));
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| 86 | }
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| 87 |
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| 88 | particleGun->GeneratePrimaryVertex(anEvent);
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| 89 | }
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| 90 |
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| 91 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 92 |
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