F01PrimaryGeneratorAction.cc

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// $Id$
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#include "F01PrimaryGeneratorAction.hh"

#include "F01DetectorConstruction.hh"
#include "F01PrimaryGeneratorMessenger.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "Randomize.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ios.hh"

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 G4String F01PrimaryGeneratorAction::fgPrimaryParticleName = "e-" ; 

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F01PrimaryGeneratorAction::F01PrimaryGeneratorAction(
                                            F01DetectorConstruction* det)
  : fParticleGun(0),
    fDetector(det), 
    fGunMessenger(0),
    fRndmFlag("off"),
    fXVertex(0.), 
    fYVertex(0.), 
    fZVertex(0.),
    fVertexDefined(false)
{
  G4int n_particle = 1;
  fParticleGun = new G4ParticleGun(n_particle);
  
  // create a messenger for this class
  fGunMessenger = new F01PrimaryGeneratorMessenger(this);

  // default particle kinematic

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle
    = particleTable->FindParticle(particleName="e-");
  fParticleGun->SetParticleDefinition(particle);
  
  fgPrimaryParticleName = particle->GetParticleName() ;

  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,-1.));
  fParticleGun->SetParticleEnergy(0.5*GeV);

  fZVertex = fDetector->GetAbsorberZpos() -0.5*(fDetector->GetAbsorberThickness());
  fParticleGun->SetParticlePosition(G4ThreeVector(fXVertex,fYVertex,fZVertex));

}

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F01PrimaryGeneratorAction::~F01PrimaryGeneratorAction()
{
  delete fParticleGun;
  delete fGunMessenger;
}

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void F01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  // this function is called at the begining of event
  // 
  fgPrimaryParticleName 
    = fParticleGun->GetParticleDefinition()->GetParticleName() ;
  G4double x0,y0,z0 ;
  if (fVertexDefined)
  {
    x0 = fXVertex ;
    y0 = fYVertex ;
    z0 = fZVertex ;
  }
  else
  {
    x0 = 0. ;
    y0 = 0. ;
    z0 = fDetector->GetAbsorberZpos()-0.5*(fDetector->GetAbsorberThickness());
  }
  G4double r0,phi0 ;

  if (fRndmFlag == "on")
  {
    r0 = (fDetector->GetAbsorberRadius())*std::sqrt(G4UniformRand());
    phi0 = twopi*G4UniformRand();
    x0 = r0*std::cos(phi0);
    y0 = r0*std::sin(phi0);
  } 

  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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G4String F01PrimaryGeneratorAction::GetPrimaryName()
{
   return fgPrimaryParticleName ;
}

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void F01PrimaryGeneratorAction::SetZVertex(G4double z)
{
  fVertexDefined = true ;
  fZVertex = z ;
  G4cout << " Z coordinate of the primary vertex = " << fZVertex/mm <<
            " mm." << G4endl;
}

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void F01PrimaryGeneratorAction::SetXVertex(G4double x)
{
  fVertexDefined = true ;
  fXVertex = x ;
  G4cout << " X coordinate of the primary vertex = " << fXVertex/mm <<
            " mm." << G4endl;
}

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void F01PrimaryGeneratorAction::SetYVertex(G4double y)
{
  fVertexDefined = true ;
  fYVertex = y ;
  G4cout << " Y coordinate of the primary vertex = " << fYVertex/mm <<
            " mm." << G4endl;
}

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