/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/SimG4Core/Application/src/GFlashEMShowerModel.cc

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//
// initial setup : E.Barberio & Joanna Weng 
// big changes : Soon Jun & Dongwook Jang
// V.Ivanchenko rename the class, cleanup, and move
//              to SimG4Core/Application - 2012/08/14
//
#include "SimG4Core/Application/interface/SteppingAction.h"
#include "SimG4Core/Application/interface/GFlashEMShowerModel.h"

#include "SimGeneral/GFlash/interface/GflashEMShowerProfile.h"
#include "SimGeneral/GFlash/interface/GflashHit.h"

#include "G4Electron.hh"
#include "G4Positron.hh"
#include "G4VProcess.hh"
#include "G4VPhysicalVolume.hh" 
#include "G4LogicalVolume.hh"
#include "G4TransportationManager.hh"
#include "G4EventManager.hh"
#include "G4FastSimulationManager.hh"
#include "G4TouchableHandle.hh"
#include "G4VSensitiveDetector.hh"

GFlashEMShowerModel::GFlashEMShowerModel(const G4String& modelName, 
                                         G4Envelope* envelope, 
                                         const edm::ParameterSet& parSet)
  : G4VFastSimulationModel(modelName, envelope), theParSet(parSet) 
{
  theWatcherOn = parSet.getParameter<bool>("watcherOn");

  theProfile = new GflashEMShowerProfile(parSet);
  theRegion  = const_cast<const G4Region*>(envelope); 

  theGflashStep = new G4Step();
  theGflashTouchableHandle = new G4TouchableHistory();
  theGflashNavigator = new G4Navigator();

}

// --------------------------------------------------------------------------

GFlashEMShowerModel::~GFlashEMShowerModel() 
{
  delete theProfile;
  delete theGflashStep;
}

G4bool 
GFlashEMShowerModel::IsApplicable(const G4ParticleDefinition& particleType) 
{ 
  return ( &particleType == G4Electron::Electron() ||
           &particleType == G4Positron::Positron() ); 
}

// --------------------------------------------------------------------------
G4bool GFlashEMShowerModel::ModelTrigger(const G4FastTrack & fastTrack ) 
{
  // Mininum energy cutoff to parameterize
  if(fastTrack.GetPrimaryTrack()->GetKineticEnergy() < GeV) { return false; }
  if(excludeDetectorRegion(fastTrack)) { return false; }

  // This will be changed accordingly when the way 
  // dealing with CaloRegion changes later.
  G4TouchableHistory* touch = 
    (G4TouchableHistory*)(fastTrack.GetPrimaryTrack()->GetTouchable());
  G4VPhysicalVolume* pCurrentVolume = touch->GetVolume();
  if( pCurrentVolume == 0) { return false; }

  G4LogicalVolume* lv = pCurrentVolume->GetLogicalVolume();
  if(lv->GetRegion() != theRegion) { return false; }
  //std::cout << "GFlashEMShowerModel::ModelTrigger: LV " 
  //        << lv->GetRegion()->GetName() << std::endl;

  // The parameterization starts inside crystals
  //std::size_t pos1 = lv->GetName().find("EBRY");
  //std::size_t pos2 = lv->GetName().find("EFRY");
  
  //std::size_t pos3 = lv->GetName().find("HVQ");
  //std::size_t pos4 = lv->GetName().find("HF");
  //if(pos1 == std::string::npos && pos2 == std::string::npos &&
  //   pos3 == std::string::npos && pos4 == std::string::npos) return false;

  return true;

}

// ---------------------------------------------------------------------------
void GFlashEMShowerModel::DoIt(const G4FastTrack& fastTrack, 
                               G4FastStep& fastStep) 
{
  // Kill the parameterised particle:
  fastStep.KillPrimaryTrack();
  fastStep.ProposePrimaryTrackPathLength(0.0);

  // Input variables for GFlashEMShowerProfile with showerType = 1,5 
  // Shower starts inside crystals
  G4double energy = fastTrack.GetPrimaryTrack()->GetKineticEnergy()/GeV;
  G4double globalTime = 
    fastTrack.GetPrimaryTrack()->GetStep()->GetPostStepPoint()->GetGlobalTime();
  G4double charge = 
    fastTrack.GetPrimaryTrack()->GetStep()->GetPreStepPoint()->GetCharge();
  G4ThreeVector position = fastTrack.GetPrimaryTrack()->GetPosition()/cm;
  G4ThreeVector momentum = fastTrack.GetPrimaryTrack()->GetMomentum()/GeV;
  G4int showerType = Gflash::findShowerType(position);

  // Do actual parameterization
  // The result of parameterization is gflashHitList
  theProfile->initialize(showerType,energy,globalTime,charge,
                         position,momentum);
  theProfile->parameterization();

  // Make hits
  makeHits(fastTrack);
}

// ---------------------------------------------------------------------------
void GFlashEMShowerModel::makeHits(const G4FastTrack& fastTrack) 
{
  std::vector<GflashHit>& gflashHitList = theProfile->getGflashHitList();

  theGflashStep->SetTrack(const_cast<G4Track*>(fastTrack.GetPrimaryTrack()));

  theGflashStep->GetPostStepPoint()
    ->SetProcessDefinedStep(const_cast<G4VProcess*>(fastTrack.GetPrimaryTrack()
         ->GetStep()->GetPostStepPoint()->GetProcessDefinedStep()));
  theGflashNavigator->SetWorldVolume(G4TransportationManager::GetTransportationManager()->GetNavigatorForTracking()->GetWorldVolume());

  std::vector<GflashHit>::const_iterator spotIter    = gflashHitList.begin();
  std::vector<GflashHit>::const_iterator spotIterEnd = gflashHitList.end();

  for(; spotIter != spotIterEnd; spotIter++){

    // Put touchable for each hit so that touchable history 
    //     keeps track of each step.
    theGflashNavigator->LocateGlobalPointAndUpdateTouchableHandle(spotIter->getPosition(),G4ThreeVector(0,0,0),theGflashTouchableHandle, false);
    updateGflashStep(spotIter->getPosition(),spotIter->getTime());

    // If there is a watcher defined in a job and the flag is turned on
    if(theWatcherOn) {
      SteppingAction* userSteppingAction = (SteppingAction*) G4EventManager::GetEventManager()->GetUserSteppingAction();
      userSteppingAction->m_g4StepSignal(theGflashStep);
    }

    // Send G4Step information to Hit/Digi if the volume is sensitive
    // Copied from G4SteppingManager.cc
    
    G4VPhysicalVolume* aCurrentVolume = 
      theGflashStep->GetPreStepPoint()->GetPhysicalVolume();
    if( aCurrentVolume == 0 ) { continue; }

    G4LogicalVolume* lv = aCurrentVolume->GetLogicalVolume();
    if(lv->GetRegion() != theRegion) { continue; }

    theGflashStep->GetPreStepPoint()->SetSensitiveDetector(aCurrentVolume->GetLogicalVolume()->GetSensitiveDetector());
    G4VSensitiveDetector* aSensitive = theGflashStep->GetPreStepPoint()->GetSensitiveDetector();
      
    if( aSensitive == 0 ) { continue; }

    theGflashStep->SetTotalEnergyDeposit(spotIter->getEnergy());
    aSensitive->Hit(theGflashStep);
  }
}

// ---------------------------------------------------------------------------
void GFlashEMShowerModel::updateGflashStep(const G4ThreeVector& spotPosition, 
                                            G4double timeGlobal)
{
  theGflashStep->GetPostStepPoint()->SetGlobalTime(timeGlobal);
  theGflashStep->GetPreStepPoint()->SetPosition(spotPosition);
  theGflashStep->GetPostStepPoint()->SetPosition(spotPosition);
  theGflashStep->GetPreStepPoint()->SetTouchableHandle(theGflashTouchableHandle);
}

// ---------------------------------------------------------------------------
G4bool GFlashEMShowerModel::excludeDetectorRegion(const G4FastTrack& fastTrack)
{
  G4bool isExcluded=false;

  //exclude regions where geometry are complicated
  //+- one supermodule around the EB/EE boundary: 1.479 +- 0.0174*5 
  G4double eta =   fastTrack.GetPrimaryTrack()->GetPosition().pseudoRapidity();
  if(std::fabs(eta) > 1.392 && std::fabs(eta) < 1.566) { return true; }

  return isExcluded;
}

// ---------------------------------------------------------------------------