Gabriele Cosmo
120 lines
4.0 KiB
C++
120 lines
4.0 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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// This example is provided by the Geant4-DNA collaboration
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// Any report or published results obtained using the Geant4-DNA software
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// shall cite the following Geant4-DNA collaboration publication:
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// Med. Phys. 37 (2010) 4692-4708
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// The Geant4-DNA web site is available at http://geant4-dna.org
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//
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// If you use this example, please cite the following publication:
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// Rad. Prot. Dos. 133 (2009) 2-11
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//
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#include "PrimaryGeneratorAction.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4Event.hh"
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#include "G4ParticleTable.hh"
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#include "Randomize.hh"
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PrimaryGeneratorAction::PrimaryGeneratorAction()
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{
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fParticleGun = new G4ParticleGun(1);
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}
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PrimaryGeneratorAction::~PrimaryGeneratorAction()
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{
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delete fParticleGun;
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}
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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
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{
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G4int numEvent;
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numEvent=anEvent->GetEventID()+1;
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G4double x0,y0,z0,theta,phi,xMom0,yMom0,zMom0,e0;
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// INITIAL BEAM POSITION
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z0=-10000*mm;
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x0=10*mm;
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y0=10*mm;
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G4double sizeMax = 0.5*micrometer; // INITIAL BEAM POSITION UNIFORMLY SPREAD ON A DISK
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while (! (std::sqrt(x0*x0+y0*y0)<= sizeMax) )
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{
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x0 = CLHEP::RandFlat::shoot(-sizeMax,sizeMax);
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y0 = CLHEP::RandFlat::shoot(-sizeMax,sizeMax);
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}
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// INITIAL BEAM ENERGY
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e0= G4RandGauss::shoot(3*MeV,5.0955e-5*MeV); // AIFIRA ENERGY RESOLUTION
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// INITIAL BEAM DIVERGENCE
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do {
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theta=std::acos(1-G4UniformRand()*(1.0-std::cos(1.1e-6)))*rad;
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}
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while(theta>1.1e-6*rad);
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phi=CLHEP::twopi*G4UniformRand()*rad;
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xMom0=std::sin(theta)*std::cos(phi);
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yMom0=std::sin(theta)*std::sin(phi);
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zMom0=std::cos(theta);
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// VERBOSE
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G4cout
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<< "-> Event # " << numEvent
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<< " generated "
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<< G4endl;
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/*
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G4cout
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<< "-> Event # " << numEvent
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<< " : THETA from Z axis (mrad) = " << theta*1000
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<< " -- PHI (deg) = " << phi*180/CLHEP::pi
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<< " -- x0 (um) = " << x0/micrometer
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<< " -- y0 (um) = " << y0/micrometer
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<< " -- z0 (m) = " << z0/m
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<< " -- e0 (MeV) = " << e0/MeV
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<< G4endl;
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*/
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fParticleGun->SetParticleEnergy(e0);
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fParticleGun->SetParticleMomentumDirection(G4ThreeVector(xMom0,yMom0,zMom0));
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fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
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G4ParticleDefinition* particle=
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G4ParticleTable::GetParticleTable()->FindParticle("alpha");
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fParticleGun->SetParticleDefinition(particle);
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fParticleGun->GeneratePrimaryVertex(anEvent);
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}
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