source: trunk/source/event/src/G4SingleParticleSource.cc @ 1347

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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 "G4PrimaryParticle.hh"
#include "G4Event.hh"
#include "Randomize.hh"
#include <cmath>
#include "G4ParticleTable.hh"
#include "G4Geantino.hh"
#include "G4ParticleDefinition.hh"
#include "G4IonTable.hh"
#include "G4Ions.hh"
#include "G4TrackingManager.hh"
#include "G4Track.hh"
#include "G4SingleParticleSource.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();
                G4double energy = particle_energy + mass;
                G4double pmom = std::sqrt(energy * energy - mass * mass);
                G4double px = pmom * particle_momentum_direction.x();
                G4double py = pmom * particle_momentum_direction.y();
                G4double pz = pmom * particle_momentum_direction.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;
                }
                G4PrimaryParticle* particle = new G4PrimaryParticle(
                                particle_definition, px, py, pz);
                particle->SetMass(mass);
                particle->SetCharge(particle_charge);
                particle->SetPolarization(particle_polarization.x(),
                                particle_polarization.y(), particle_polarization.z());
                // 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;
}