dmparticle/src/PrimaryGeneratorAction.cc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 /// \file PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028
0029 #include "PrimaryGeneratorAction.hh"
0030
0031 #include "DetectorConstruction.hh"
0032 #include "TestParameters.hh"
0033
0034 #include "G4Event.hh"
0035 #include "G4ParticleDefinition.hh"
0036 #include "G4ParticleGun.hh"
0037 #include "G4SystemOfUnits.hh"
0038
0039 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0040
0041 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
0042   : G4VUserPrimaryGeneratorAction(), fDetector(det)
0043 {
0044   fParticleGun = new G4ParticleGun(1);
0045   fParticleGun->SetParticleEnergy(100 * GeV);
0046   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0047 }
0048
0049 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0050
0051 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0052 {
0053   delete fParticleGun;
0054 }
0055
0056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0057
0058 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0059 {
0060   // this function is called at the begining of event
0061   if (0 == anEvent->GetEventID()) {
0062     G4double z0 = -0.5 * (fDetector->GetWorldSizeZ()) + 1 * um;
0063     G4cout << "Event = " << anEvent->GetEventID() << "; z0 = " << z0;
0064     fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, z0));
0065     G4cout << "  Primary direction = " << fParticleGun->GetParticleMomentumDirection() << G4endl;
0066     TestParameters* param = TestParameters::GetPointer();
0067     param->SetBeamParticle(fParticleGun->GetParticleDefinition());
0068     param->SetBeamEnergy(fParticleGun->GetParticleEnergy());
0069     param->SetPositionZ(z0);
0070   }
0071   fParticleGun->GeneratePrimaryVertex(anEvent);
0072 }
0073
0074 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......