Gabriele Cosmo
88 lines
3.5 KiB
C++
88 lines
3.5 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 eventgenerator/particleGun/src/PrimaryGeneratorAction0.cc
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/// \brief Implementation of the PrimaryGeneratorAction0 class
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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 "PrimaryGeneratorAction0.hh"
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#include "PrimaryGeneratorAction.hh"
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#include "G4Event.hh"
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#include "G4ParticleGun.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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PrimaryGeneratorAction0::PrimaryGeneratorAction0(G4ParticleGun* gun)
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: fParticleGun(gun)
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{
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//solid angle
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//
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G4double alphaMin = 0*deg; //alpha in [0,pi]
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G4double alphaMax = 60*deg;
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fCosAlphaMin = std::cos(alphaMin);
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fCosAlphaMax = std::cos(alphaMax);
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fPsiMin = 0*deg; //psi in [0, 2*pi]
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fPsiMax = 360*deg;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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PrimaryGeneratorAction0::~PrimaryGeneratorAction0()
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{ }
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void PrimaryGeneratorAction0::GeneratePrimaries(G4Event* anEvent)
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{
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//vertex position fixed
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//
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G4double x0 = 0*mm, y0 = 0*mm, z0 = 0*mm;
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fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
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//direction uniform in solid angle
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//
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G4double cosAlpha = fCosAlphaMin-G4UniformRand()*(fCosAlphaMin-fCosAlphaMax);
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G4double sinAlpha = std::sqrt(1. - cosAlpha*cosAlpha);
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G4double psi = fPsiMin + G4UniformRand()*(fPsiMax - fPsiMin);
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G4double ux = sinAlpha*std::cos(psi),
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uy = sinAlpha*std::sin(psi),
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uz = cosAlpha;
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,uz));
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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