Gabriele Cosmo
132 lines
5.0 KiB
C++
132 lines
5.0 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 PrimaryGeneratorAction.cc
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/// \brief Implementation of the PrimaryGeneratorAction class
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#include "PrimaryGeneratorAction.hh"
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#include "PrimaryGeneratorMessenger.hh"
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#include "G4Event.hh"
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#include "G4OpticalPhoton.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4ParticleGun.hh"
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#include "G4ParticleTable.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(nullptr)
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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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// create a messenger for this class
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fGunMessenger = new PrimaryGeneratorMessenger(this);
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G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
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G4ParticleDefinition* particle = particleTable->FindParticle("e+");
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fParticleGun->SetParticleDefinition(particle);
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fParticleGun->SetParticleTime(0.0 * ns);
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fParticleGun->SetParticlePosition(G4ThreeVector(0.0 * cm, 0.0 * cm, 0.0 * cm));
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
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fParticleGun->SetParticleEnergy(500.0 * keV);
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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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delete fGunMessenger;
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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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if (fRandomDirection) {
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G4double theta = CLHEP::halfpi * G4UniformRand();
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G4double phi = CLHEP::twopi * G4UniformRand();
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G4double x = std::cos(theta);
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G4double y = std::sin(theta) * std::sin(phi);
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G4double z = std::sin(theta) * std::cos(phi);
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G4ThreeVector dir(x, y, z);
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fParticleGun->SetParticleMomentumDirection(dir);
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}
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if (fParticleGun->GetParticleDefinition() == G4OpticalPhoton::OpticalPhotonDefinition()) {
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if (fPolarized)
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SetOptPhotonPolar(fPolarization);
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else
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SetOptPhotonPolar();
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}
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void PrimaryGeneratorAction::SetOptPhotonPolar()
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{
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G4double angle = G4UniformRand() * 360.0 * deg;
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SetOptPhotonPolar(angle);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void PrimaryGeneratorAction::SetOptPhotonPolar(G4double angle)
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{
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if (fParticleGun->GetParticleDefinition() != G4OpticalPhoton::OpticalPhotonDefinition()) {
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G4ExceptionDescription ed;
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ed << "The particleGun is not an opticalphoton.";
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G4Exception("PrimaryGeneratorAction::SetOptPhotonPolar", "OpNovice2_004", JustWarning, ed);
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return;
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}
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fPolarized = true;
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fPolarization = angle;
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G4ThreeVector normal(1., 0., 0.);
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G4ThreeVector kphoton = fParticleGun->GetParticleMomentumDirection();
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G4ThreeVector product = normal.cross(kphoton);
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G4double modul2 = product * product;
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G4ThreeVector e_perpend(0., 0., 1.);
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if (modul2 > 0.) e_perpend = (1. / std::sqrt(modul2)) * product;
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G4ThreeVector e_paralle = e_perpend.cross(kphoton);
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G4ThreeVector polar = std::cos(angle) * e_paralle + std::sin(angle) * e_perpend;
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fParticleGun->SetParticlePolarization(polar);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void PrimaryGeneratorAction::SetRandomDirection(G4bool val)
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{
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fRandomDirection = val;
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}
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