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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/// \file 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 "DetectorConstruction.hh"
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#include "G4Event.hh"
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#include "G4ParticleTable.hh"
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#include "G4IonTable.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4Geantino.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(DetectorConstruction* det)
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: G4VUserPrimaryGeneratorAction(), fParticleGun(0), fDetector(det)
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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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fParticleGun->SetParticleEnergy(0*eV);
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fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,0.));
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
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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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//particle type
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if (fParticleGun->GetParticleDefinition() == G4Geantino::Geantino()) {
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G4int Z = 95, A = 241;
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G4double ionCharge = 0.*eplus;
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G4double excitEnergy = 0.*keV;
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G4ParticleDefinition* ion
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= G4IonTable::GetIonTable()->GetIon(Z,A,excitEnergy);
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fParticleGun->SetParticleDefinition(ion);
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fParticleGun->SetParticleCharge(ionCharge);
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}
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//vertex position uniform within the absorber
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//
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G4double Rmax = fDetector->GetAbsorRadius();
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G4double Rmax2 = Rmax*Rmax;
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G4double R2 = G4UniformRand()*Rmax2;
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G4double R = std::sqrt(R2);
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G4double phi = twopi*G4UniformRand();
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G4double ux = R*std::cos(phi),
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uy = R*std::sin(phi);
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G4double uz = (fDetector->GetAbsorLength())*(G4UniformRand() - 0.5);
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fParticleGun->SetParticlePosition(G4ThreeVector(ux,uy,uz));
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//distribution uniform in solid angle
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//
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G4double cosTheta = 2*G4UniformRand() - 1.;
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G4double sinTheta = std::sqrt(1. - cosTheta*cosTheta);
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phi = twopi*G4UniformRand();
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G4double vx = sinTheta*std::cos(phi),
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vy = sinTheta*std::sin(phi),
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vz = cosTheta;
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(vx,vy,vz));
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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