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"
#include "G4AutoLock.hh"

G4SingleParticleSource::part_prop_t::part_prop_t() {
  //definition = G4Geantino::GeantinoDefinition();
  momentum_direction = G4ParticleMomentum(1,0,0);
  energy = 1.*MeV;
  position = G4ThreeVector();
}

G4SingleParticleSource::G4SingleParticleSource() {
//  // Initialise all variables
//  // Position distribution Variables
//
  NumberOfParticlesToBeGenerated = 1;
  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;
  charge = 0.0;
  time = 0;
  polarization = G4ThreeVector();

  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;
    
    G4MUTEXINIT(mutex);

}

G4SingleParticleSource::~G4SingleParticleSource() {
  delete biasRndm;
  delete posGenerator;
  delete angGenerator;
  delete eneGenerator;
    G4MUTEXDESTROY(mutex);
}

void G4SingleParticleSource::SetVerbosity(int vL) {
        G4AutoLock l(&mutex);
  verbosityLevel = vL;
  posGenerator->SetVerbosity(vL);
  angGenerator->SetVerbosity(vL);
  eneGenerator->SetVerbosity(vL);
  //G4cout << "Verbosity Set to: " << verbosityLevel << G4endl;
}

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

void G4SingleParticleSource::GeneratePrimaryVertex(G4Event *evt) {

    //G4AutoLock l(&mutex);
        //part_prop_t& pp = ParticleProperties.Get();
  if (definition == NULL) {
    //TODO: Should this rise an exception???
    return ;
  }
    //return;

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

        part_prop_t& pp = ParticleProperties.Get();
  // Position stuff
  pp.position = posGenerator->GenerateOne();

  // create a new vertex
  G4PrimaryVertex* vertex = new G4PrimaryVertex(pp.position,time);

  for (G4int i = 0; i < NumberOfParticlesToBeGenerated; i++) {
    // Angular stuff
    pp.momentum_direction = angGenerator->GenerateOne();
    // Energy stuff
    pp.energy = eneGenerator->GenerateOne(definition);

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