Gabriele Cosmo
109 lines
4.1 KiB
C++
109 lines
4.1 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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// $Id: B4PrimaryGeneratorAction.cc 100946 2016-11-03 11:28:08Z gcosmo $
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//
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/// \file B4PrimaryGeneratorAction.cc
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/// \brief Implementation of the B4PrimaryGeneratorAction class
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#include "B4PrimaryGeneratorAction.hh"
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#include "G4RunManager.hh"
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#include "G4LogicalVolumeStore.hh"
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#include "G4LogicalVolume.hh"
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#include "G4Box.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 "G4SystemOfUnits.hh"
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#include "Randomize.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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B4PrimaryGeneratorAction::B4PrimaryGeneratorAction()
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: G4VUserPrimaryGeneratorAction(),
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fParticleGun(nullptr)
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{
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G4int nofParticles = 1;
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fParticleGun = new G4ParticleGun(nofParticles);
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// default particle kinematic
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//
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auto particleDefinition
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= G4ParticleTable::GetParticleTable()->FindParticle("e-");
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fParticleGun->SetParticleDefinition(particleDefinition);
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
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fParticleGun->SetParticleEnergy(50.*MeV);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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B4PrimaryGeneratorAction::~B4PrimaryGeneratorAction()
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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 B4PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
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{
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// This function is called at the begining of event
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// In order to avoid dependence of PrimaryGeneratorAction
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// on DetectorConstruction class we get world volume
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// from G4LogicalVolumeStore
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//
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G4double worldZHalfLength = 0.;
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auto worldLV = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
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// Check that the world volume has box shape
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G4Box* worldBox = nullptr;
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if ( worldLV ) {
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worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
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}
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if ( worldBox ) {
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worldZHalfLength = worldBox->GetZHalfLength();
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}
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else {
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G4ExceptionDescription msg;
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msg << "World volume of box shape not found." << G4endl;
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msg << "Perhaps you have changed geometry." << G4endl;
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msg << "The gun will be place in the center.";
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G4Exception("B4PrimaryGeneratorAction::GeneratePrimaries()",
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"MyCode0002", JustWarning, msg);
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}
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// Set gun position
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fParticleGun
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->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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