Gabriele Cosmo
126 lines
4.2 KiB
C++
126 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 MedicalBeam.cc
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/// \brief Implementation of the CLHEP::MedicalBeam class
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///
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/// Define beam profile as primary generator
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#include "MedicalBeam.hh"
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#include "G4Event.hh"
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#include "G4ParticleTable.hh"
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#include "G4PrimaryVertex.hh"
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#include "Randomize.hh"
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#include <cmath>
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using namespace CLHEP;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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MedicalBeam::MedicalBeam()
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: fparticle(0),
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fkineticE(1. * MeV),
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fsourcePosition(G4ThreeVector()),
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fSSD(1. * m),
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ffieldShape(MedicalBeam::kSQUARE),
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ffieldR(10. * cm)
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{
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G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
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fparticle = particleTable->FindParticle("proton");
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fkineticE = 200. * MeV;
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fsourcePosition = G4ThreeVector(0., 0., -125. * cm);
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fSSD = 100. * cm;
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ffieldXY[0] = ffieldXY[1] = 5. * cm;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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MedicalBeam::~MedicalBeam() {}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4ThreeVector MedicalBeam::GenerateBeamDirection() const
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{
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// uniform distribution in a limitted solid angle
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G4double dr;
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if (ffieldShape == MedicalBeam::kSQUARE) {
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dr = std::sqrt(sqr(ffieldXY[0] / 2.) + sqr(ffieldXY[1] / 2.));
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}
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else {
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dr = ffieldR;
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}
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G4double sin0 = dr / fSSD;
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G4double cos0 = std::sqrt(1. - sqr(sin0));
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G4double dcos = 0.;
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G4double dsin, dphi, z;
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G4double x = DBL_MAX;
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G4double y = DBL_MAX;
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G4double xmax, ymax;
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if (ffieldShape == MedicalBeam::kSQUARE) {
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xmax = ffieldXY[0] / 2. / fSSD;
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ymax = ffieldXY[1] / 2. / fSSD;
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}
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else {
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xmax = ymax = DBL_MAX - 1.;
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}
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while (!(std::abs(x) < xmax && std::abs(y) < ymax)) {
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dcos = G4RandFlat::shoot(cos0, 1.);
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dsin = std::sqrt(1. - sqr(dcos));
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dphi = G4RandFlat::shoot(0., twopi);
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x = std::cos(dphi) * dsin * dcos;
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y = std::sin(dphi) * dsin * dcos;
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}
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z = dcos;
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return G4ThreeVector(x, y, z);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void MedicalBeam::GeneratePrimaries(G4Event* anEvent)
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{
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if (fparticle == NULL) return;
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// create a new vertex
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G4PrimaryVertex* vertex = new G4PrimaryVertex(fsourcePosition, 0. * ns);
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// momentum
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G4double mass = fparticle->GetPDGMass();
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G4double p = std::sqrt(sqr(mass + fkineticE) - sqr(mass));
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G4ThreeVector pmon = p * GenerateBeamDirection();
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G4PrimaryParticle* primary = new G4PrimaryParticle(fparticle, pmon.x(), pmon.y(), pmon.z());
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// set primary to vertex
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vertex->SetPrimary(primary);
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// set vertex to event
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anEvent->AddPrimaryVertex(vertex);
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}
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