LocalFieldManager.cc

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#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "SimG4Core/MagneticField/interface/LocalFieldManager.h"

#include "G4ChordFinder.hh"
#include "G4Track.hh"

#include <CLHEP/Units/SystemOfUnits.h>

#include <iostream>

using namespace sim;

LocalFieldManager::LocalFieldManager(G4Field *commonField, G4FieldManager *priFM, G4FieldManager *altFM)
    : G4FieldManager(commonField, nullptr, false),
      fPrimaryFM(priFM),
      fAlternativeFM(altFM),
      fCurrentFM(nullptr),
      fVerbosity(false) {
  this->CopyValuesAndChordFinder(priFM);
  fCurrentFM = priFM;
}

void LocalFieldManager::ConfigureForTrack(const G4Track *trk) {
  int PID = trk->GetDynamicParticle()->GetDefinition()->GetPDGEncoding();

  if (std::abs(PID) != 13)  // maybe also high energy pions ?... what else ?
  {
    if (fCurrentFM != fAlternativeFM) {
      this->CopyValuesAndChordFinder(fAlternativeFM);
      fCurrentFM = fAlternativeFM;
      if (fVerbosity)
        print(trk);
    }
  } else {
    if (fCurrentFM != fPrimaryFM) {
      this->CopyValuesAndChordFinder(fPrimaryFM);
      fCurrentFM = fPrimaryFM;
      if (fVerbosity)
        print(trk);
    }
  }
}

const G4FieldManager *LocalFieldManager::CopyValuesAndChordFinder(G4FieldManager *fm) {
  SetDeltaIntersection(fm->GetDeltaIntersection());
  SetDeltaOneStep(fm->GetDeltaOneStep());
  G4ChordFinder *cf = fm->GetChordFinder();
  cf->SetDeltaChord(cf->GetDeltaChord());
  SetChordFinder(cf);

  return fm;
}

void LocalFieldManager::print(const G4Track *trk) {
  std::string ss = (fCurrentFM == fAlternativeFM) ? "Alternative field manager with" : "Global field manager with";

  edm::LogVerbatim("SimG4CoreMagneticField")
      << ss << " DeltaIntersection= " << G4FieldManager::GetDeltaIntersection()
      << ", DeltaOneStep= " << G4FieldManager::GetDeltaOneStep()
      << ", DeltaChord= " << G4FieldManager::GetChordFinder()->GetDeltaChord() << " for "
      << trk->GetDynamicParticle()->GetDefinition()->GetPDGEncoding() << " with "
      << trk->GetKineticEnergy() / CLHEP::GeV << " GeV in " << trk->GetVolume()->GetName();
}