PrimaryGeneratorAction.cc

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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// shall cite the following Geant4-DNA collaboration publications:
// Med. Phys. 37 (2010) 4692-4708
// Phys. Med. 31 (2015) 861-874
// The Geant4-DNA web site is available at http://geant4-dna.org
//

#include "PrimaryGeneratorAction.hh"
#include "DetectorConstruction.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"
#include "G4RandomDirection.hh"
#include "G4RunManager.hh"
#include "G4StateManager.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

PrimaryGeneratorAction::PrimaryGeneratorAction()
:G4VUserPrimaryGeneratorAction(), G4VStateDependent(),
 fParticleGun(0),
 fDetector(0)
{
  fDetector =
      dynamic_cast<const DetectorConstruction*>(G4RunManager::GetRunManager()
          ->GetUserDetectorConstruction());
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  G4StateManager::GetStateManager()->DeregisterDependent(this);
  if(fParticleGun) delete fParticleGun;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{    
  G4double thickness = fDetector->GetCytoThickness();
  G4double radius = fDetector->GetNuclRadius();

  G4double rx=1*m;
  G4double ry=1*m;
  G4double rz=1*m;
  G4double myRadius = 0;

  do
  {
    rx = (2*G4UniformRand()-1)*(radius+thickness)*1.01;
    ry = (2*G4UniformRand()-1)*(radius+thickness)*1.01;
    rz = (2*G4UniformRand()-1)*(radius+thickness)*1.01;
    myRadius = std::sqrt(rx*rx+ry*ry+rz*rz);

  } while (myRadius>radius+thickness || myRadius<radius) ;

  fParticleGun->SetParticlePosition(G4ThreeVector(rx,ry,rz));
  fParticleGun->SetParticleMomentumDirection(G4RandomDirection());
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

G4bool PrimaryGeneratorAction::Notify(G4ApplicationState requestedState)
{
  if(requestedState == G4State_Idle)
  {
    if(fParticleGun != 0) return true;

    fParticleGun  = new G4ParticleGun(1);

    // Define default primary
    G4ParticleDefinition* particle
             = G4ParticleTable::GetParticleTable()->FindParticle("e-");
    fParticleGun->SetParticleDefinition(particle);
    fParticleGun->SetParticleEnergy(0*eV);
    fParticleGun->SetParticlePosition(G4ThreeVector());
    fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1,0,0));
  }

  return true;
}