Gabriele Cosmo
93 lines
3.6 KiB
C++
93 lines
3.6 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file electromagnetic/TestEm4/src/PrimaryGeneratorAction.cc
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/// \brief Implementation of the PrimaryGeneratorAction class
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//
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//
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//
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#include "PrimaryGeneratorAction.hh"
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#include "G4Event.hh"
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#include "G4ParticleGun.hh"
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#include "G4ParticleTable.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "Randomize.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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PrimaryGeneratorAction::PrimaryGeneratorAction()
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: G4VUserPrimaryGeneratorAction(),fParticleGun(0)
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{
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G4int n_particle = 1;
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fParticleGun = new G4ParticleGun(n_particle);
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// default particle kinematic
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G4ParticleDefinition* particle
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= G4ParticleTable::GetParticleTable()->FindParticle("gamma");
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fParticleGun->SetParticleDefinition(particle);
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
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fParticleGun->SetParticleEnergy(9*MeV);
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fParticleGun->SetParticlePosition(G4ThreeVector(0.*cm,0.*cm,0.*cm));
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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PrimaryGeneratorAction::~PrimaryGeneratorAction()
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{
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delete fParticleGun;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
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{
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//this function is called at the begining of event
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//
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//distribution uniform in solid angle
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//
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G4double cosTheta = 2*G4UniformRand() - 1., phi = twopi*G4UniformRand();
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G4double sinTheta = std::sqrt(1. - cosTheta*cosTheta);
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G4double ux = sinTheta*std::cos(phi),
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uy = sinTheta*std::sin(phi),
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uz = cosTheta;
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,uz));
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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