G4SingleParticleSource.cc

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//
// G4SingleParticleSource source implementation
//
// Author: Fan Lei, QinetiQ ltd. - 05/02/2004
// Customer: ESA/ESTEC
// Revision: Andrea Dotti, SLAC
// --------------------------------------------------------------------
 
#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()
{
  momentum_direction = G4ParticleMomentum(1,0,0);
  energy = 1.*MeV;
  position = G4ThreeVector();
}
 
G4SingleParticleSource::G4SingleParticleSource()
{
  // Initialise all variables
  // Position distribution Variables
 
  NumberOfParticlesToBeGenerated = 1;
  definition = G4Geantino::GeantinoDefinition();
 
  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);
 
  verbosityLevel = 0;
    
  G4MUTEXINIT(mutex);
}
 
G4SingleParticleSource::~G4SingleParticleSource()
{
  delete biasRndm;
  delete posGenerator;
  delete angGenerator;
  delete eneGenerator;
 
  G4MUTEXDESTROY(mutex);
}
 
void G4SingleParticleSource::SetVerbosity(G4int vL)
{
  G4AutoLock l(&mutex);
  verbosityLevel = vL;
  posGenerator->SetVerbosity(vL);
  angGenerator->SetVerbosity(vL);
  eneGenerator->SetVerbosity(vL);
}
 
void G4SingleParticleSource::
SetParticleDefinition(G4ParticleDefinition* aParticleDefinition)
{
  definition = aParticleDefinition;
  charge = aParticleDefinition->GetPDGCharge();
}
 
void G4SingleParticleSource::GeneratePrimaryVertex(G4Event* evt)
{
  if (definition == nullptr)
  {
    // TODO: Should this rise an exception???
    return;
  }
 
  if (verbosityLevel > 1)
  {
    G4cout << " NumberOfParticlesToBeGenerated: "
           << NumberOfParticlesToBeGenerated << G4endl;
  }
 
  part_prop_t& pp = ParticleProperties.Get();
 
  // Position stuff
  pp.position = posGenerator->GenerateOne();
 
  // Create a new vertex
  auto* 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();
    auto* 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();
 
    if(eneGenerator->IfApplyEnergyWeight())
    {
      weight *= eneGenerator->GetArbEneWeight(pp.energy);
    }
 
    // 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;
  }
}