Gabriele Cosmo
115 lines
4.2 KiB
C++
115 lines
4.2 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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//
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/// \file B1PrimaryGeneratorAction.cc
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/// \brief Implementation of the B1PrimaryGeneratorAction class
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#include "B1PrimaryGeneratorAction.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 "G4RunManager.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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B1PrimaryGeneratorAction::B1PrimaryGeneratorAction()
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: G4VUserPrimaryGeneratorAction(),
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fParticleGun(0),
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fEnvelopeBox(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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G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
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G4String particleName;
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G4ParticleDefinition* particle
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= particleTable->FindParticle(particleName="gamma");
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fParticleGun->SetParticleDefinition(particle);
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
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fParticleGun->SetParticleEnergy(6.*MeV);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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B1PrimaryGeneratorAction::~B1PrimaryGeneratorAction()
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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 B1PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
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{
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//this function is called at the begining of ecah event
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//
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// In order to avoid dependence of PrimaryGeneratorAction
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// on DetectorConstruction class we get Envelope volume
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// from G4LogicalVolumeStore.
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G4double envSizeXY = 0;
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G4double envSizeZ = 0;
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if (!fEnvelopeBox)
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{
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G4LogicalVolume* envLV
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= G4LogicalVolumeStore::GetInstance()->GetVolume("Envelope");
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if ( envLV ) fEnvelopeBox = dynamic_cast<G4Box*>(envLV->GetSolid());
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}
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if ( fEnvelopeBox ) {
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envSizeXY = fEnvelopeBox->GetXHalfLength()*2.;
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envSizeZ = fEnvelopeBox->GetZHalfLength()*2.;
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}
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else {
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G4ExceptionDescription msg;
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msg << "Envelope volume of box shape not found.\n";
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msg << "Perhaps you have changed geometry.\n";
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msg << "The gun will be place at the center.";
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G4Exception("B1PrimaryGeneratorAction::GeneratePrimaries()",
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"MyCode0002",JustWarning,msg);
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}
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G4double size = 0.8;
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G4double x0 = size * envSizeXY * (G4UniformRand()-0.5);
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G4double y0 = size * envSizeXY * (G4UniformRand()-0.5);
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G4double z0 = -0.5 * envSizeZ;
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fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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