G4BlinePrimaryGeneratorAction.cc

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/// \file field/BlineTracer/src/G4BlinePrimaryGeneratorAction.cc
/// \brief Implementation of the G4BlinePrimaryGeneratorAction class
//
//
//
//
// --------------------------------------------------------------------
//
// G4BlinePrimaryGeneratorAction implementation
//
// --------------------------------------------------------------------
// Author: Laurent Desorgher (desorgher@phim.unibe.ch)
//         Created - 2003-10-06
// --------------------------------------------------------------------
 
#include "G4BlinePrimaryGeneratorAction.hh"
 
#include "G4Types.hh"
#include "G4Event.hh"
#include "G4ChargedGeantino.hh"
#include "G4SystemOfUnits.hh"
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void G4BlinePrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  if (!fUserPrimaryAction)
  {
    G4Exception("G4BlinePrimaryGeneratorAction::GeneratePrimaries()",
                "NullPointer", JustWarning,
                "Primary generator action not defined !");
    return;
  }
 
  // For the first part of a bline the start position and time are defined
  // by using the USER primary action while for the second part the previous
  // values are taken.
 
  if (fFirstPartOfBline)
  {
    // set the position and time defined by using the USER primary action
 
    auto  tmpEvent = new G4Event();
    fUserPrimaryAction->GeneratePrimaries(tmpEvent);
    fBlineStartPosition = tmpEvent->GetPrimaryVertex()->GetPosition();
    fT0 = tmpEvent->GetPrimaryVertex()->GetT0();
    delete tmpEvent;
  }
  fFirstPartOfBline = false;
 
  auto  primary_vertex =
    new G4PrimaryVertex(fBlineStartPosition, fT0);
 
  // Define the particle to be tracked as Charged Geantino
 
  G4ChargedGeantino* pdef = G4ChargedGeantino::ChargedGeantino();
 
  G4double mass =  pdef->GetPDGMass();
  G4double energy = 10000.*MeV + mass;
  G4double pmom = std::sqrt(energy*energy-mass*mass);
 
  // The momentum direction and energy do not have an effect in tracing of
  // bline but still need to be defined.
 
  G4double px = 0.;
  G4double py = 0.;
  G4double pz = pmom;
 
  auto  particle = new G4PrimaryParticle(pdef,px,py,pz);
  particle->SetMass( mass );
  particle->SetCharge(pdef->GetPDGCharge());
  primary_vertex->SetPrimary( particle );
 
  anEvent->AddPrimaryVertex( primary_vertex );
}