Gabriele Cosmo
134 lines
4.2 KiB
C++
134 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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// ====================================================================
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// MedicalBeam.cc
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//
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// 2005 Q
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// ====================================================================
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#include "MedicalBeam.hh"
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#include "Randomize.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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using namespace CLHEP;
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#include <cmath>
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// ====================================================================
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//
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// class description
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//
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// ====================================================================
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///////////////////////////////////
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MedicalBeam::MedicalBeam()
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: particle(0),
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kineticE(1.*MeV),
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sourcePosition(G4ThreeVector()),
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SSD(1.*m),
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fieldShape(MedicalBeam::SQUARE),
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fieldR(10.*cm)
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///////////////////////////////////
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{
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fieldXY[0]= fieldXY[1]= 10.*cm;
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}
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///////////////////////////
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MedicalBeam::~MedicalBeam()
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///////////////////////////
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{
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}
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////////////////////////////////////////////////////////
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G4ThreeVector MedicalBeam::GenerateBeamDirection() const
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////////////////////////////////////////////////////////
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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(fieldShape == MedicalBeam::SQUARE) {
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dr= std::sqrt(sqr(fieldXY[0]/2.)+sqr(fieldXY[1]/2.));
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} else {
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dr= fieldR;
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}
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G4double sin0= dr/SSD;
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G4double cos0= std::sqrt(1.-sqr(sin0));
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G4double dcos, 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(fieldShape == MedicalBeam::SQUARE) {
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xmax= fieldXY[0]/2./SSD;
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ymax= fieldXY[1]/2./SSD;
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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= RandFlat::shoot(cos0, 1.);
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dsin= std::sqrt(1.-sqr(dcos));
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dphi= RandFlat::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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/////////////////////////////////////////////////////
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void MedicalBeam::GeneratePrimaries(G4Event* anEvent)
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/////////////////////////////////////////////////////
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{
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if(particle==0) return;
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// create a new vertex
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G4PrimaryVertex* vertex= new G4PrimaryVertex(sourcePosition, 0.*ns);
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// momentum
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G4double mass= particle-> GetPDGMass();
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G4double p= std::sqrt(sqr(mass+kineticE)-sqr(mass));
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G4ThreeVector pmon= p*GenerateBeamDirection();
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G4PrimaryParticle* primary= new G4PrimaryParticle(particle,
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pmon.x(),
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pmon.y(),
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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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