Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/track/src/G4FieldTrackUpdator.cc

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  1 //
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 25 //
 26 // G4FieldTrackUpdator class implementation
 27 //
 28 // Author: M.Asai, 28 April 2006
 29 // --------------------------------------------------------------------
 30 
 31 #include "globals.hh"
 32 #include "G4FieldTrackUpdator.hh"
 33 #include "G4ThreeVector.hh"
 34 #include "G4Track.hh"
 35 #include "G4DynamicParticle.hh"
 36 #include "G4TrackStatus.hh"
 37 #include "G4FieldTrack.hh"
 38 
 39 //---------------------------------------------------------------------
 40 G4FieldTrack* G4FieldTrackUpdator::CreateFieldTrack(const G4Track* trk)
 41 {
 42   return new G4FieldTrack(
 43     trk->GetPosition(), trk->GetGlobalTime(), trk->GetMomentumDirection(),
 44     trk->GetKineticEnergy(), trk->GetDynamicParticle()->GetMass(),
 45     trk->GetDynamicParticle()->GetCharge(),
 46     trk->GetDynamicParticle()->GetPolarization(),
 47     0.0  // magnetic dipole moment to be implemented
 48   );
 49 }
 50 
 51 //---------------------------------------------------------------------
 52 void G4FieldTrackUpdator::Update(G4FieldTrack* ftrk, const G4Track* trk)
 53 {
 54   const G4DynamicParticle* ptDynamicParticle = trk->GetDynamicParticle();
 55 
 56   // The following properties must be updated 1) for each new track, and
 57   ftrk->SetRestMass(ptDynamicParticle->GetMass());
 58   // 2) Since ion can lose/gain electrons, this must be done at every step
 59 
 60   ftrk->UpdateState(trk->GetPosition(), trk->GetGlobalTime(),
 61                     trk->GetMomentumDirection(), trk->GetKineticEnergy());
 62 
 63 #ifdef G4CHECK
 64   if((trk->GetMomentum() - ftrk->GetMomentum()).mag2() >
 65      1.e-16 * trk->GetMomentum().mag2())
 66   {
 67     G4cerr << "ERROR> G4FieldTrackUpdator sees *Disagreement* in momentum "
 68            << G4endl;
 69     G4cout << "  FTupdator: Tracking Momentum= " << trk->GetMomentum()
 70            << G4endl;
 71     G4cout << "  FTupdator: FldTrack Momentum= " << ftrk->GetMomentum()
 72            << G4endl;
 73     G4cout << "  FTupdator: FldTrack-Tracking= "
 74            << ftrk->GetMomentum() - trk->GetMomentum() << G4endl;
 75   }
 76 #endif
 77 
 78   ftrk->SetProperTimeOfFlight(trk->GetProperTime());
 79 
 80   ftrk->SetChargeAndMoments(ptDynamicParticle->GetCharge(),
 81                             ptDynamicParticle->GetMagneticMoment());
 82   ftrk->SetPDGSpin(ptDynamicParticle->GetParticleDefinition()->GetPDGSpin());
 83   // The charge can change during tracking
 84   ftrk->SetSpin(ptDynamicParticle->GetPolarization());
 85 }
 86