Gabriele Cosmo
109 lines
4.2 KiB
C++
109 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 eventgenerator/particleGun/src/PrimaryGeneratorAction4.cc
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/// \brief Implementation of the PrimaryGeneratorAction4 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 "PrimaryGeneratorAction4.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 "G4ParticleTable.hh"
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#include "G4ParticleDefinition.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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PrimaryGeneratorAction4::PrimaryGeneratorAction4(G4ParticleGun* gun)
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: fParticleGun(gun)
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{
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// vertex volume
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//
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G4double Rmin = 2.*mm;
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G4double Rmax = 8.*mm;
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fRmin3 = Rmin*Rmin*Rmin;
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fRmax3 = Rmax*Rmax*Rmax;
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//opening angle
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//
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G4double alphaMin = 0.*deg;
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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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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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PrimaryGeneratorAction4::~PrimaryGeneratorAction4()
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{ }
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void PrimaryGeneratorAction4::GeneratePrimaries(G4Event* anEvent)
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{
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//vertex position uniform in spherical shell
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//
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G4double cosTheta = 2*G4UniformRand() - 1; //cosTheta uniform in [0, pi]
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G4double sinTheta = std::sqrt(1. - cosTheta*cosTheta);
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G4double phi = twopi*G4UniformRand(); //phi uniform in [0, 2*pi]
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G4ThreeVector ur(sinTheta*std::cos(phi),sinTheta*std::sin(phi),cosTheta);
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G4double R3 = fRmin3 + G4UniformRand()*(fRmax3 - fRmin3);
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G4double R = std::pow(R3, 1./3);
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fParticleGun->SetParticlePosition(R*ur);
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//particle direction uniform around ur
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//
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//1- in World frame
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//cosAlpha uniform in [cos(alphaMin), cos(alphaMax)]
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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 = twopi*G4UniformRand(); //psi uniform in (0,2*pi)
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G4ThreeVector dir(sinAlpha*std::cos(psi),sinAlpha*std::sin(psi),cosAlpha);
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//2- rotate dir (rotateUz transforms uz to ur)
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dir.rotateUz(ur);
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fParticleGun->SetParticleMomentumDirection(dir);
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//energy
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//
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fParticleGun->SetParticleEnergy(1*MeV);
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//create vertex
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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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