G4FieldTrackUpdator.cc

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// G4FieldTrackUpdator class implementation
//
// Author: M.Asai, 28 April 2006
// --------------------------------------------------------------------
 
#include "globals.hh"
#include "G4FieldTrackUpdator.hh"
#include "G4ThreeVector.hh"
#include "G4Track.hh"
#include "G4DynamicParticle.hh"
#include "G4TrackStatus.hh"
#include "G4FieldTrack.hh"
 
//---------------------------------------------------------------------
G4FieldTrack* G4FieldTrackUpdator::CreateFieldTrack(const G4Track* trk)
{
  G4FieldTrack* ftrk = new G4FieldTrack(
    trk->GetPosition(), trk->GetGlobalTime(), trk->GetMomentumDirection(),
    trk->GetKineticEnergy(), trk->GetDynamicParticle()->GetMass(),
    trk->GetDynamicParticle()->GetCharge(),
    trk->GetDynamicParticle()->GetPolarization(),
    0.0  // magnetic dipole moment to be implemented
  );
  return ftrk;
}
 
//---------------------------------------------------------------------
void G4FieldTrackUpdator::Update(G4FieldTrack* ftrk, const G4Track* trk)
{
  const G4DynamicParticle* ptDynamicParticle = trk->GetDynamicParticle();
 
  // The following properties must be updated 1) for each new track, and
  ftrk->SetRestMass(ptDynamicParticle->GetMass());
  // 2) Since ion can lose/gain electrons, this must be done at every step
 
  ftrk->UpdateState(trk->GetPosition(), trk->GetGlobalTime(),
                    trk->GetMomentumDirection(), trk->GetKineticEnergy());
 
#ifdef G4CHECK
  if((trk->GetMomentum() - ftrk->GetMomentum()).mag2() >
     1.e-16 * trk->GetMomentum().mag2())
  {
    G4cerr << "ERROR> G4FieldTrackUpdator sees *Disagreement* in momentum "
           << G4endl;
    G4cout << "  FTupdator: Tracking Momentum= " << trk->GetMomentum()
           << G4endl;
    G4cout << "  FTupdator: FldTrack Momentum= " << ftrk->GetMomentum()
           << G4endl;
    G4cout << "  FTupdator: FldTrack-Tracking= "
           << ftrk->GetMomentum() - trk->GetMomentum() << G4endl;
  }
#endif
 
  ftrk->SetProperTimeOfFlight(trk->GetProperTime());
 
  ftrk->SetChargeAndMoments(ptDynamicParticle->GetCharge(),
                            ptDynamicParticle->GetMagneticMoment());
  ftrk->SetPDGSpin(ptDynamicParticle->GetParticleDefinition()->GetPDGSpin());
  // The charge can change during tracking
  ftrk->SetSpin(ptDynamicParticle->GetPolarization());
}