examples/extended/electromagnetic/TestEm2/src/PrimaryGeneratorAction.cc

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// $Id: PrimaryGeneratorAction.cc 109103 2018-03-27 07:39:04Z gcosmo $
//
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#include "PrimaryGeneratorAction.hh"

#include "DetectorConstruction.hh"
#include "G4Event.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4SystemOfUnits.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction (DetectorConstruction* det)
:G4VUserPrimaryGeneratorAction(), 
 fParticleGun(0),fDetector(det)
{
  G4int n_particle = 1;
  fParticleGun  = new G4ParticleGun(n_particle);

  G4ParticleDefinition* particle
    = G4ParticleTable::GetParticleTable()->FindParticle("e-");
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticleEnergy(5.*GeV);  
  fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,-1*cm));  
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
}

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PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  delete fParticleGun;
}

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  //this function is called at the begin of event
  //
  G4double position = -0.5*(fDetector->GetfullLength());
  fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,position));
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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