F06PrimaryGeneratorAction.cc

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#include "F06PrimaryGeneratorAction.hh"

#include "F06DetectorConstruction.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "Randomize.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

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F06PrimaryGeneratorAction::F06PrimaryGeneratorAction(void)
{
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle);
  
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* particle = particleTable->FindParticle("neutron");

  particleGun->SetParticleDefinition(particle);
}

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F06PrimaryGeneratorAction::~F06PrimaryGeneratorAction()
{
  delete particleGun;
}

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void F06PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  //this function is called at the begining of event
  //

  particleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
  particleGun->SetParticlePolarization(G4ThreeVector(0,1,0));

  G4double particleEnergy = G4UniformRand()*1e-7*eV;
  particleGun->SetParticleEnergy(particleEnergy);

  G4double theta = 2*pi*G4UniformRand();
  G4double phi = std::acos(1-2*G4UniformRand());
  if (phi > pi/2 && phi < pi) phi = pi-phi;

  G4double z = std::sin(phi)*std::cos(theta);
  G4double x = std::sin(phi)*std::sin(theta);
  G4double y = std::cos(phi);

  particleGun->SetParticleMomentumDirection(G4ThreeVector(x,y,z));

  particleGun->GeneratePrimaryVertex(anEvent);
}

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