G4SingleParticleSource.cc

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///////////////////////////////////////////////////////////////////////////////
//
// MODULE:        G4SingleParticleSource.hh
//
// Version:      1.0
// Date:         5/02/04
// Author:       Fan Lei 
// Organisation: QinetiQ ltd.
// Customer:     ESA/ESTEC
//
///////////////////////////////////////////////////////////////////////////////
//
// CHANGE HISTORY
// --------------
//
// Version 1.0, 05/02/2004, Fan Lei, Created.
//      Based on the G4GeneralParticleSource class in Geant4 v6.0
//
///////////////////////////////////////////////////////////////////////////////
//
#include <cmath>

#include "G4SingleParticleSource.hh"

#include "G4SystemOfUnits.hh"
#include "G4PrimaryParticle.hh"
#include "G4Event.hh"
#include "Randomize.hh"
#include "G4ParticleTable.hh"
#include "G4Geantino.hh"
#include "G4ParticleDefinition.hh"
#include "G4IonTable.hh"
#include "G4Ions.hh"
#include "G4TrackingManager.hh"
#include "G4Track.hh"

G4SingleParticleSource::G4SingleParticleSource() {
    // Initialise all variables
    // Position distribution Variables

    NumberOfParticlesToBeGenerated = 1;
    particle_definition = G4Geantino::GeantinoDefinition();
    G4ThreeVector zero;
    particle_momentum_direction = G4ParticleMomentum(1, 0, 0);
    particle_energy = 1.0 * MeV;
    particle_position = zero;
    particle_time = 0.0;
    particle_polarization = zero;
    particle_charge = 0.0;
    particle_weight = 1.0;

    biasRndm = new G4SPSRandomGenerator();
    posGenerator = new G4SPSPosDistribution();
    posGenerator->SetBiasRndm(biasRndm);
    angGenerator = new G4SPSAngDistribution();
    angGenerator->SetPosDistribution(posGenerator);
    angGenerator->SetBiasRndm(biasRndm);
    eneGenerator = new G4SPSEneDistribution();
    eneGenerator->SetBiasRndm(biasRndm);

    // verbosity
    verbosityLevel = 0;

}

G4SingleParticleSource::~G4SingleParticleSource() {
    delete biasRndm;
    delete posGenerator;
    delete angGenerator;
    delete eneGenerator;
}

void G4SingleParticleSource::SetVerbosity(int vL) {
    verbosityLevel = vL;
    posGenerator->SetVerbosity(vL);
    angGenerator->SetVerbosity(vL);
    eneGenerator->SetVerbosity(vL);
    G4cout << "Verbosity Set to: " << verbosityLevel << G4endl;
}

void G4SingleParticleSource::SetParticleDefinition(
        G4ParticleDefinition* aParticleDefinition) {
    particle_definition = aParticleDefinition;
    particle_charge = particle_definition->GetPDGCharge();
}

void G4SingleParticleSource::GeneratePrimaryVertex(G4Event *evt) {
    if (particle_definition == NULL)
        return;

    if (verbosityLevel > 1)
        G4cout << " NumberOfParticlesToBeGenerated: "
                << NumberOfParticlesToBeGenerated << G4endl;

    // Position stuff
    particle_position = posGenerator->GenerateOne();

    // create a new vertex
    G4PrimaryVertex* vertex = new G4PrimaryVertex(particle_position,
            particle_time);

    for (G4int i = 0; i < NumberOfParticlesToBeGenerated; i++) {
        // Angular stuff
        particle_momentum_direction = angGenerator->GenerateOne();
        // Energy stuff
        particle_energy = eneGenerator->GenerateOne(particle_definition);

        if (verbosityLevel >= 2)
            G4cout << "Creating primaries and assigning to vertex" << G4endl;
        // create new primaries and set them to the vertex
        G4double mass = particle_definition->GetPDGMass();
        G4PrimaryParticle* particle =
          new G4PrimaryParticle(particle_definition);
        particle->SetKineticEnergy( particle_energy );
        particle->SetMass( mass );
        particle->SetMomentumDirection( particle_momentum_direction );
        particle->SetCharge( particle_charge );
        particle->SetPolarization(particle_polarization.x(),
                      particle_polarization.y(),
                      particle_polarization.z());
        if (verbosityLevel > 1) {
            G4cout << "Particle name: "
                    << particle_definition->GetParticleName() << G4endl;
            G4cout << "       Energy: " << particle_energy << G4endl;
            G4cout << "     Position: " << particle_position << G4endl;
            G4cout << "    Direction: " << particle_momentum_direction
                    << G4endl;
        }
        // Set bweight equal to the multiple of all non-zero weights
        particle_weight = eneGenerator->GetWeight()*biasRndm->GetBiasWeight();
        // pass it to primary particle
        particle->SetWeight(particle_weight);

        vertex->SetPrimary(particle);

    }
    // now pass the weight to the primary vertex. CANNOT be used here!
    //  vertex->SetWeight(particle_weight);
    evt->AddPrimaryVertex(vertex);
    if (verbosityLevel > 1)
        G4cout << " Primary Vetex generated !" << G4endl;
}