BLMSensorSD.cxx

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/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/
 
//###############################################
//   BLM Sensitive Detector class
//   Bostjan Macek 14.february.2008
//###############################################
 
// Class header
#include "BLMSensorSD.h"
 
// Athena headers
#include "MCTruth/AtlasG4EventUserInfo.h"
#include "MCTruth/TrackHelper.h"
 
// Geant4 headers
#include <G4EventManager.hh>
#include "G4Step.hh"
#include "G4ThreeVector.hh"
#include "G4Geantino.hh"
#include "G4ChargedGeantino.hh"
 
// CLHEP headers
#include "CLHEP/Geometry/Transform3D.h"
#include "CLHEP/Units/SystemOfUnits.h"
 
 
BLMSensorSD::BLMSensorSD(const std::string& name, const std::string& hitCollectionName)
  : G4VSensitiveDetector( name )
  , m_HitCollName( hitCollectionName )
{
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
// Initialize from G4 - cache the hit collection for the current event
void BLMSensorSD::Initialize(G4HCofThisEvent *)
{
  // ISF calls G4SDManager::PrepareNewEvent() before the Geant4 event loop starts...
  if(auto* eventManger = G4EventManager::GetEventManager()){
    if(auto* eventInfo = static_cast<AtlasG4EventUserInfo*>(eventManger->GetUserInformation())){
      m_HitColl = eventInfo->GetHitCollectionMap()->Find<SiHitCollection>(m_HitCollName);
      m_g4UserEventInfo = eventInfo;
    }
  }
}
 
G4bool BLMSensorSD::ProcessHits(G4Step* aStep, G4TouchableHistory* /*ROhist*/)
{
  G4double edep = aStep->GetTotalEnergyDeposit();
  edep *= CLHEP::MeV;
 
  //if there is no energy deposition skip everything
  if(edep==0.)
    {
      if(aStep->GetTrack()->GetDefinition()!=G4Geantino::GeantinoDefinition() && aStep->GetTrack()->GetDefinition()!=G4ChargedGeantino::ChargedGeantinoDefinition()) return false;
    }
 
  //Get the Touchable History:
  const G4TouchableHistory *myTouch = dynamic_cast<const G4TouchableHistory*>(aStep->GetPreStepPoint()->GetTouchable());
  if (not myTouch) {
    G4cout << "BLMSensorSD::ProcessHits bad dynamic_cast" << G4endl;
    return false;
  }
  int BEcopyNo =  myTouch->GetVolume()->GetCopyNo();
 
  // Get the hit coordinates. Start and End Point
  G4ThreeVector coord1 = aStep->GetPreStepPoint()->GetPosition();
  G4ThreeVector coord2 = aStep->GetPostStepPoint()->GetPosition();
 
  // Calculate the local step begin and end position.
  // From a G4 FAQ:
  // http://geant4-hn.slac.stanford.edu:5090/HyperNews/public/get/geometry/17/1.html
  const G4AffineTransform transformation = myTouch->GetHistory()->GetTopTransform();
  G4ThreeVector localPosition1 = transformation.TransformPoint(coord1);
  G4ThreeVector localPosition2 = transformation.TransformPoint(coord2);
 
  HepGeom::Point3D<double> lP1,lP2;
  lP1[SiHit::xEta] = localPosition1[2]*CLHEP::mm;
  lP1[SiHit::xPhi] = localPosition1[1]*CLHEP::mm;
  lP1[SiHit::xDep] = localPosition1[0]*CLHEP::mm;
 
  lP2[SiHit::xEta] = localPosition2[2]*CLHEP::mm;
  lP2[SiHit::xPhi] = localPosition2[1]*CLHEP::mm;
  lP2[SiHit::xDep] = localPosition2[0]*CLHEP::mm;
 
  //BLM hit stuff
  if(BEcopyNo == 2009)
    {
      TrackHelper trHelp(aStep->GetTrack());
      //primary or not
      int primaren = 0;
      if(trHelp.IsPrimary())
        primaren = 1;
      else if(trHelp.IsRegeneratedPrimary())
        primaren = 2;
      else if(trHelp.IsSecondary())
        primaren = 3;
      else if(trHelp.IsRegisteredSecondary())
        primaren = 4;
 
      int produced_in_diamond = 0;
      if(aStep->GetTrack()->GetLogicalVolumeAtVertex()->GetName() == "Pixel::blmDiamondLog")
        produced_in_diamond = 1;
      else if(aStep->GetTrack()->GetLogicalVolumeAtVertex()->GetName() == "Pixel::blmModLog")
        produced_in_diamond = 2;
      else if(aStep->GetTrack()->GetLogicalVolumeAtVertex()->GetName() == "Pixel::blmWallLog")
        produced_in_diamond = 3;
 
      m_HitColl->Emplace(lP1, lP2, edep, aStep->GetPreStepPoint()->GetGlobalTime(),
                         trHelp.GenerateParticleLink(m_g4UserEventInfo ? m_g4UserEventInfo->GetEventStore() : nullptr),
                         0, 0, myTouch->GetVolume(1)->GetCopyNo()-222, 0, primaren, produced_in_diamond);
    }
  return true;
}