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//
/// \file TrackingAction.cc
/// \brief Implementation of the TrackingAction class
//
//
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#include "TrackingAction.hh"

#include "EventAction.hh"
#include "HistoManager.hh"
#include "Run.hh"
#include "TrackingMessenger.hh"

#include "G4IonTable.hh"
#include "G4ParticleTypes.hh"
#include "G4RunManager.hh"
#include "G4SystemOfUnits.hh"
#include "G4Track.hh"
#include "G4UnitsTable.hh"

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TrackingAction::TrackingAction(EventAction* event) : fEvent(event)

{
  fTrackMessenger = new TrackingMessenger(this);
}

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TrackingAction::~TrackingAction()
{
  delete fTrackMessenger;
}

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void TrackingAction::SetTimeWindow(G4double t1, G4double dt)
{
  fTimeWindow1 = t1;
  fTimeWindow2 = fTimeWindow1 + dt;
}

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void TrackingAction::PreUserTrackingAction(const G4Track* track)
{
  Run* run = static_cast<Run*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());

  G4ParticleDefinition* particle = track->GetDefinition();
  G4String name = particle->GetParticleName();
  fCharge = particle->GetPDGCharge();
  fMass = particle->GetPDGMass();

  G4double Ekin = track->GetKineticEnergy();
  G4int ID = track->GetTrackID();

  G4bool condition = false;

  // check LifeTime
  //
  G4double meanLife = particle->GetPDGLifeTime();

  // count particles
  //
  run->ParticleCount(name, Ekin, meanLife);

  int creator_id = track->GetCreatorModelID();

  // energy spectrum
  //
  G4int ih = 0;
  if (particle == G4Electron::Electron() || particle == G4Positron::Positron())
  {
      if(25520==creator_id || 25530==creator_id) ih = 1;
  }
  else if (particle == G4NeutrinoE::NeutrinoE() || particle == G4AntiNeutrinoE::AntiNeutrinoE())
    ih = 2;
  else if (particle == G4Gamma::Gamma())
    ih = 3;
  else if (particle == G4Alpha::Alpha())
    ih = 4;
  else if (fCharge > 2.)
    ih = 5;
  if (ih) G4AnalysisManager::Instance()->FillH1(ih, Ekin);

  // Ion
  //
  if (fCharge > 2.) {
    // build decay chain
    if (ID == 1)
      fEvent->AddDecayChain(name);
    else
      fEvent->AddDecayChain(" ---> " + name);
    //
    // full chain: put at rest; if not: kill secondary
    G4Track* tr = (G4Track*)track;
    if (fFullChain) {
      tr->SetKineticEnergy(0.);
      tr->SetTrackStatus(fStopButAlive);
    }
    else if (ID > 1)
      tr->SetTrackStatus(fStopAndKill);
    //
    fTimeBirth = track->GetGlobalTime();
  }

  // example of saving random number seed of this fEvent, under condition
  //
  ////condition = (ih == 3);
  if (condition) G4RunManager::GetRunManager()->rndmSaveThisEvent();
}

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void TrackingAction::PostUserTrackingAction(const G4Track* track)
{
  // keep only ions
  //
  if (fCharge < 3.) return;

  Run* run = static_cast<Run*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());

  G4AnalysisManager* analysis = G4AnalysisManager::Instance();

  // get time
  //
  G4double time = track->GetGlobalTime();
  G4int ID = track->GetTrackID();
  if (ID == 1) run->PrimaryTiming(time);  // time of life of primary ion
  fTimeEnd = time;

  // energy and momentum balance (from secondaries)
  //
  const std::vector<const G4Track*>* secondaries = track->GetStep()->GetSecondaryInCurrentStep();
  size_t nbtrk = (*secondaries).size();
  if (nbtrk) {
    // there are secondaries --> it is a decay
    //
    // balance
    G4double EkinTot = 0., EkinVis = 0.;
    G4ThreeVector Pbalance = -track->GetMomentum();
    for (size_t itr = 0; itr < nbtrk; itr++) {
      const G4Track* trk = (*secondaries)[itr];
      G4ParticleDefinition* particle = trk->GetDefinition();
      G4double Ekin = trk->GetKineticEnergy();
      EkinTot += Ekin;
      G4bool visible =
        !((particle == G4NeutrinoE::NeutrinoE()) || (particle == G4AntiNeutrinoE::AntiNeutrinoE()));
      if (visible) EkinVis += Ekin;
      // exclude gamma desexcitation from momentum balance
      if (particle != G4Gamma::Gamma()) Pbalance += trk->GetMomentum();
    }
    G4double Pbal = Pbalance.mag();
    run->Balance(EkinTot, Pbal);
    analysis->FillH1(6, EkinTot);
    analysis->FillH1(7, Pbal);
    fEvent->AddEvisible(EkinVis);
  }

  // no secondaries --> end of chain
  //
  if (!nbtrk) {
    run->EventTiming(time);  // total time of life
    G4double weight = track->GetWeight();
    analysis->FillH1(8, time, weight);
    ////    analysis->FillH1(8,time);
    fTimeEnd = DBL_MAX;
  }

  // count activity in time window
  //
  run->SetTimeWindow(fTimeWindow1, fTimeWindow2);

  G4String name = track->GetDefinition()->GetParticleName();
  G4bool life1(false), life2(false), decay(false);
  if ((fTimeBirth <= fTimeWindow1) && (fTimeEnd > fTimeWindow1)) life1 = true;
  if ((fTimeBirth <= fTimeWindow2) && (fTimeEnd > fTimeWindow2)) life2 = true;
  if ((fTimeEnd > fTimeWindow1) && (fTimeEnd < fTimeWindow2)) decay = true;
  if (life1 || life2 || decay) run->CountInTimeWindow(name, life1, life2, decay);
}

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