VG01PrimaryGeneratorAction.cc

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//
/// \file VG01PrimaryGeneratorAction.cc
/// \brief Implementation of the VG01PrimaryGeneratorAction class
//
//  Authors: J. Apostolakis & S. Wenzel (CERN)  2018-2021
//
//  Started from FullCMS code by Mihaly Novak (CERN) 2017  
 
#include "VG01PrimaryGeneratorAction.hh"
#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4SystemOfUnits.hh"
 
#include "G4RandomDirection.hh"
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
VG01PrimaryGeneratorAction::VG01PrimaryGeneratorAction( EGeneratorMode mode )
 : G4VUserPrimaryGeneratorAction(),
   fParticleGun(0),
   fMode(mode)
{
  G4int n_particle = 1;
  fParticleGun = new G4ParticleGun(n_particle);
 
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  fParticleGun->SetParticleDefinition(
               particleTable->FindParticle(particleName="geantino"));
  fParticleGun->SetParticleEnergy(1.0*GeV);
  fParticleGun->SetParticlePosition(G4ThreeVector(0,0,0) ); // -1.2*m, 0.1, 0.1));
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
VG01PrimaryGeneratorAction::~VG01PrimaryGeneratorAction()
{
  delete fParticleGun;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void VG01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4ThreeVector dir(1.0,0.0,0.0);
 
  // G4ThreeVector FixedMode[3] = 
  //  { G4ThreeVector(1,0,0), G4ThreeVector(1,0.1,0), G4ThreeVector( 1, 0, 0.1)};
  G4ThreeVector AxisModeVectors[3] = 
      { G4ThreeVector(1,0,0), G4ThreeVector(0,1,0), G4ThreeVector( 0, 0, 1.0)};
 
  if( fMode == kFreeMode ){
    // Do not fix the direction 
    //   -- UI commands to particle mode can change it!
    fParticleGun->GeneratePrimaryVertex(anEvent);
    return; 
    //----
  } 
  else if( fMode == kFixedMode )
  {
    G4int i = anEvent->GetEventID() % 3;
    dir= G4ThreeVector(1.0,0.0,0.0);
    switch(i)
    {
       case 0:
          break;
       case 1:
          dir.setY(0.1);
          break;
       case 2:
          dir.setZ(0.1);
          break;
    }
  } 
  else if( fMode == kUniformMode )
  {
    dir = G4RandomDirection();
  }
  else if ( fMode == kAxisMode )
  {
    G4int i = anEvent->GetEventID() % 3;
    dir = AxisModeVectors[i];
  }
 
  fParticleGun->SetParticleMomentumDirection(dir);
  fParticleGun->GeneratePrimaryVertex(anEvent);
}