F03PrimaryGeneratorAction.cc

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// $Id$
// 

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#include "F03PrimaryGeneratorAction.hh"
#include "F03DetectorConstruction.hh"
#include "F03PrimaryGeneratorMessenger.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 F03PrimaryGeneratorAction::fgPrimaryParticleName="e-" ; 

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F03PrimaryGeneratorAction::F03PrimaryGeneratorAction(
                                            F03DetectorConstruction* det)
  : G4VUserPrimaryGeneratorAction(),
    fParticleGun(0),
    fDetector(det), 
    fMessenger(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
  //
  fMessenger = new F03PrimaryGeneratorMessenger(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(1.*GeV);

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

}

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F03PrimaryGeneratorAction::~F03PrimaryGeneratorAction()
{
  delete fParticleGun;
  delete fMessenger;
}

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void F03PrimaryGeneratorAction::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 F03PrimaryGeneratorAction::GetPrimaryName()
{
  return fgPrimaryParticleName ;
}

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void F03PrimaryGeneratorAction::SetXVertex(G4double x)
{
  fVertexDefined = true ;
  fXVertex = x ;
  G4cout << " X coordinate of the primary vertex = " << fXVertex/mm 
         << " mm." << G4endl;
}

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void F03PrimaryGeneratorAction::SetYVertex(G4double y)
{
  fVertexDefined = true ;
  fYVertex = y ;
  G4cout << " Y coordinate of the primary vertex = " << fYVertex/mm 
         << " mm." << G4endl;
}

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void F03PrimaryGeneratorAction::SetZVertex(G4double z)
{
  fVertexDefined = true ;
  fZVertex = z ;
  G4cout << " Z coordinate of the primary vertex = " << fZVertex/mm 
         << " mm." << G4endl;
}

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