G4AdjointSteppingAction.cc

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//
// G4AdjointSteppingAction class implementation
//
// Author: L. Desorgher, SpaceIT GmbH
// Contract: ESA contract 21435/08/NL/AT
// Customer: ESA/ESTEC
// --------------------------------------------------------------------
 
#include "G4AdjointSteppingAction.hh"
 
#include "G4AdjointCrossSurfChecker.hh"
#include "G4AffineTransform.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4Track.hh"
 
//////////////////////////////////////////////////////////////////////////////
//
G4AdjointSteppingAction::G4AdjointSteppingAction()
{
  theG4AdjointCrossSurfChecker = G4AdjointCrossSurfChecker::GetInstance();
}
 
//////////////////////////////////////////////////////////////////////////////
//
void G4AdjointSteppingAction::UserSteppingAction(const G4Step* aStep)
{
  G4Track* aTrack = aStep->GetTrack();
  if (! is_adjoint_tracking_mode)  // forward tracking mode
  {
    if (! did_one_adj_part_reach_ext_source_during_event) {
      aTrack->SetTrackStatus(fStopAndKill);
      return;
    }
    if (theUserFwdSteppingAction != nullptr) {
      theUserFwdSteppingAction->UserSteppingAction(aStep);
    }
    return;
  }
 
  // Apply first the user adjoint stepping action
  // --------------------------------------------
 
  did_adj_part_reach_ext_source = false;
  if (theUserAdjointSteppingAction != nullptr) {
    theUserAdjointSteppingAction->UserSteppingAction(aStep);
  }
 
  G4double nb_nuc = 1.;
  G4ParticleDefinition* thePartDef = aTrack->GetDefinition();
 
  if (thePartDef->GetParticleType() == "adjoint_nucleus") {
    nb_nuc = G4double(thePartDef->GetBaryonNumber());
  }
 
  // Kill conditions for adjoint particles reaching the maximum energy
  // -----------------------------------------------------------------
 
  if (aTrack->GetKineticEnergy() >= ext_sourceEMax * nb_nuc) {
    aTrack->SetTrackStatus(fStopAndKill);
    did_adj_part_reach_ext_source = false;
    return;
  }
 
  // Kill conditions for surface crossing
  // --------------------------------------
 
  G4String surface_name;
  G4double cos_to_surface;
  G4bool GoingIn;
  G4ThreeVector crossing_pos;
  if (theG4AdjointCrossSurfChecker->CrossingOneOfTheRegisteredSurface(
        aStep, surface_name, crossing_pos, cos_to_surface, GoingIn))
  {
    if (surface_name == "ExternalSource") {
      // Registering still needed
      did_adj_part_reach_ext_source = true;
      did_one_adj_part_reach_ext_source_during_event = true;
      aTrack->SetTrackStatus(fStopAndKill);
 
      // now register the adjoint particles reaching the external surface
      last_momentum = aTrack->GetMomentum();
      last_ekin = aTrack->GetKineticEnergy();
      last_weight = aTrack->GetWeight();
      last_part_def = aTrack->GetDefinition();
      last_pos = crossing_pos;
      return;
    }
    if (surface_name == "AdjointSource" && GoingIn) {
      did_adj_part_reach_ext_source = false;
      aTrack->SetTrackStatus(fStopAndKill);
      return;
    }
  }
 
  // Check for reaching out of world
  //
  if (aStep->GetPostStepPoint()->GetStepStatus() == fWorldBoundary) {
    did_adj_part_reach_ext_source = true;
    did_one_adj_part_reach_ext_source_during_event = true;
    last_momentum = aTrack->GetMomentum();
    last_ekin = aTrack->GetKineticEnergy();
    last_weight = aTrack->GetWeight();
    last_part_def = aTrack->GetDefinition();
    last_pos = crossing_pos;
    return;
  }
}