SimHitCreatorMS.cxx

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#include "SimHitCreatorMS.h"
 
// ISF includes
#include "ISF_Event/ISFParticle.h"
#include "ISF_Interfaces/IParticleHelper.h"
// Trk
#include "TrkTrack/Track.h"
#include "TrkExInterfaces/ITimedExtrapolator.h"
// MuonSpectrometer includes
#include "MuonReadoutGeometry/MuonStation.h"
#include "MuonReadoutGeometry/MdtReadoutElement.h"
#include "MuonReadoutGeometry/RpcReadoutElement.h"
#include "MuonReadoutGeometry/TgcReadoutElement.h"
#include "MuonReadoutGeometry/CscReadoutElement.h"
#include "MuonReadoutGeometry/MMReadoutElement.h"
#include "MuonReadoutGeometry/sTgcReadoutElement.h"
#include "MuonReadoutGeometry/MuonDetectorManager.h"
#include "MuonIdHelpers/MdtIdHelper.h"
 
#include "MuonSimEvent/MdtHitIdHelper.h"
#include "MuonSimEvent/RpcHitIdHelper.h"
#include "MuonSimEvent/CscHitIdHelper.h"
#include "MuonSimEvent/TgcHitIdHelper.h"
#include "MuonSimEvent/sTgcHitIdHelper.h"
#include "MuonSimEvent/MicromegasHitIdHelper.h"
#include "MuonSimEvent/MM_SimIdToOfflineId.h"
#include "MuonSimEvent/sTgcSimIdToOfflineId.h"
 
#include "CLHEP/Random/RandLandau.h"
#include "CLHEP/Random/RandGaussZiggurat.h"
 
namespace {
  // the tube number of a tube in a tubeLayer ia encoded in the GeoSerialIdentifier (modulo maxNTubesPerLayer)
  constexpr unsigned int maxNTubesPerLayer = MdtIdHelper::maxNTubesPerLayer;
}
 
//================ Constructor =================================================
 
iFatras::SimHitCreatorMS::SimHitCreatorMS(const std::string& t,
                                          const std::string& n,
                                          const IInterface*  p ) :
  base_class(t,n,p),
  m_incidentSvc("IncidentSvc", n),
  m_extrapolator(""),
  m_measTool("Muon::MuonTGMeasurementTool/MuonTGMeasurementTool"),
  m_mdtSimHitCollection(nullptr),
  m_rpcSimHitCollection(nullptr),
  m_tgcSimHitCollection(nullptr),
  m_cscSimHitCollection(nullptr),
  m_mmSimHitCollection(nullptr),
  m_stgcSimHitCollection(nullptr),
  m_mdtCollectionName("MDT_Hits"),
  m_rpcCollectionName("RPC_Hits"),
  m_tgcCollectionName("TGC_Hits"),
  m_cscCollectionName("CSC_Hits"),
  m_mmCollectionName("MM_Hits"),
  m_stgcCollectionName("sTGC_Hits"),
  m_randomSvc("AtDSFMTGenSvc", n),
  m_randomEngineName("FatrasRnd"),
  m_randomEngine(nullptr),
  m_mdtHitIdHelper(nullptr),
  m_rpcHitIdHelper(nullptr),
  m_cscHitIdHelper(nullptr),
  m_tgcHitIdHelper(nullptr),
  m_mmOffToSimId(nullptr),
  m_stgcOffToSimId(nullptr),
  m_muonMgr(nullptr),
  m_mdtSigmaDriftRadius(0.08),
  m_BMGid(-1),
  m_createAllMdtHits(true)
{
  //  template for property decalration
  declareProperty("MeasurementTool",              m_measTool);
  declareProperty("MdtSigmaDriftRadius",          m_mdtSigmaDriftRadius);
  // Random number svc
  declareProperty("RandomNumberService",          m_randomSvc,        "Random number generator");
  declareProperty("RandomStreamName",             m_randomEngineName, "Name of the random number stream");
  // extrapolator
  declareProperty("Extrapolator",                 m_extrapolator);
  declareProperty("MDTCollectionName",            m_mdtCollectionName);
  declareProperty("RPCCollectionName",            m_rpcCollectionName);
  declareProperty("TGCCollectionName",            m_tgcCollectionName);
  declareProperty("CSCCollectionName",            m_cscCollectionName);
  declareProperty("MMCollectionName",             m_mmCollectionName);
  declareProperty("sTGCCollectionName",           m_stgcCollectionName);
  declareProperty("CreateAllMdtHits",             m_createAllMdtHits);
}
 
//================ Initialisation =================================================
 
StatusCode iFatras::SimHitCreatorMS::initialize()
{
 
  // Get Extrapolator from ToolService
  ATH_CHECK(m_extrapolator.retrieve());
  // Get IdHelper from ToolService
  ATH_CHECK(m_idHelperSvc.retrieve());
  // the MS helpers for the different technologies
  m_mdtHitIdHelper = MdtHitIdHelper::GetHelper(m_idHelperSvc->mdtIdHelper().tubeMax());
  m_rpcHitIdHelper = RpcHitIdHelper::GetHelper(m_idHelperSvc->rpcIdHelper().gasGapMax());
  m_tgcHitIdHelper = TgcHitIdHelper::GetHelper();
  m_cscHitIdHelper = CscHitIdHelper::GetHelper();
 
  ATH_CHECK(detStore()->retrieve(m_muonMgr));
 
  m_mmOffToSimId = new MM_SimIdToOfflineId(&m_idHelperSvc->mmIdHelper());
  m_stgcOffToSimId = new sTgcSimIdToOfflineId(&m_idHelperSvc->stgcIdHelper());
 
  // get measurement tool
  ATH_CHECK(m_measTool.retrieve());
 
  // Random number service
  ATH_CHECK(m_randomSvc.retrieve());
  //Get own engine with own seeds:
  m_randomEngine = m_randomSvc->GetEngine(m_randomEngineName);
  if (!m_randomEngine) {
    ATH_MSG_ERROR( "[ --- ] Could not get random engine '" << m_randomEngineName << "'" );
    return StatusCode::FAILURE;
  }
 
 
  // Athena/Gaudi framework
  ATH_CHECK(m_incidentSvc.retrieve());
  // register to the incident service: BeginEvent for TrackCollection
  m_incidentSvc->addListener( this, IncidentType::BeginEvent);
 
  ATH_MSG_INFO( "[ mutrack ] initialize() successful." );
 
  m_BMGpresent = m_idHelperSvc->mdtIdHelper().stationNameIndex("BMG") != -1;
  if(m_BMGpresent){
    ATH_MSG_INFO("Processing configuration for layouts with BMG chambers.");
    m_BMGid = m_idHelperSvc->mdtIdHelper().stationNameIndex("BMG");
    for(int phi=6; phi<8; phi++) { // phi sectors
      for(int eta=1; eta<4; eta++) { // eta sectors
        for(int side=-1; side<2; side+=2) { // side
          if( !m_muonMgr->getMuonStation("BMG", side*eta, phi) ) continue;
          for(int roe=1; roe<= ((m_muonMgr->getMuonStation("BMG", side*eta, phi) )->nMuonReadoutElements()); roe++) { // iterate on readout elemets
            const MuonGM::MdtReadoutElement* mdtRE =
              dynamic_cast<const MuonGM::MdtReadoutElement*> ( ( m_muonMgr->getMuonStation("BMG", side*eta, phi) )->getMuonReadoutElement(roe) ); // has to be an MDT
            if(mdtRE) initDeadChannels(mdtRE);
          }
        }
      }
    }
  }
 
 
  return StatusCode::SUCCESS;
}
 
//================ Event Initialization =========================================
//
void iFatras::SimHitCreatorMS::handle( const Incident& inc ) {
  // check the incident type
  if ( inc.type() == IncidentType::BeginEvent ){
    ATH_MSG_VERBOSE("[ muon sim hit ] Setting MuonSimHit collections up");
    // check if the hit collection already contains:
    // (a)     if yes ... try to retrieve it
    if ( evtStore()->contains<MDTSimHitCollection>(m_mdtCollectionName) ){
      if ( (evtStore()->retrieve(m_mdtSimHitCollection , m_mdtCollectionName)).isFailure() )
        ATH_MSG_ERROR( "[ --- ] Unable to retrieve MDTSimHitCollection " << m_mdtCollectionName);
      // (b)     if no ... try to create it
    } else {
      m_mdtSimHitCollection = new MDTSimHitCollection( m_mdtCollectionName);
      if ( (evtStore()->record(m_mdtSimHitCollection, m_mdtCollectionName, true)).isFailure() ) {
        ATH_MSG_ERROR( "[ --- ] Unable to record MDTSimHitCollection " << m_mdtCollectionName);
        delete m_mdtSimHitCollection; m_mdtSimHitCollection=nullptr;
      }
    }
    if ( evtStore()->contains<RPCSimHitCollection>(m_rpcCollectionName) ){
      if ( (evtStore()->retrieve(m_rpcSimHitCollection , m_rpcCollectionName)).isFailure() )
        ATH_MSG_ERROR( "[ --- ] Unable to retrieve RPCSimHitCollection " << m_rpcCollectionName);
      // (b)     if no ... try to create it
    } else {
      m_rpcSimHitCollection = new RPCSimHitCollection( m_rpcCollectionName);
      if ( (evtStore()->record(m_rpcSimHitCollection, m_rpcCollectionName, true)).isFailure() ) {
        ATH_MSG_ERROR( "[ --- ] Unable to record RPCSimHitCollection " << m_rpcCollectionName);
        delete m_rpcSimHitCollection; m_rpcSimHitCollection=nullptr;
      }
    }
    if ( evtStore()->contains<TGCSimHitCollection>(m_tgcCollectionName) ){
      if ( (evtStore()->retrieve(m_tgcSimHitCollection , m_tgcCollectionName)).isFailure() )
        ATH_MSG_ERROR( "[ --- ] Unable to retrieve TGCSimHitCollection " << m_tgcCollectionName);
      // (b)     if no ... try to create it
    } else {
      m_tgcSimHitCollection = new TGCSimHitCollection( m_tgcCollectionName);
      if ( (evtStore()->record(m_tgcSimHitCollection, m_tgcCollectionName, true)).isFailure() ) {
        ATH_MSG_ERROR( "[ --- ] Unable to record TGCSimHitCollection " << m_tgcCollectionName);
        delete m_tgcSimHitCollection; m_tgcSimHitCollection=nullptr;
      }
    }
    if ( evtStore()->contains<CSCSimHitCollection>(m_cscCollectionName) ){
      if ( (evtStore()->retrieve(m_cscSimHitCollection , m_cscCollectionName)).isFailure() )
        ATH_MSG_ERROR( "[ --- ] Unable to retrieve CSCSimHitCollection " << m_cscCollectionName);
      // (b)     if no ... try to create it
    } else {
      m_cscSimHitCollection = new CSCSimHitCollection( m_cscCollectionName);
      if ( (evtStore()->record(m_cscSimHitCollection, m_cscCollectionName, true)).isFailure() ) {
        ATH_MSG_ERROR( "[ --- ] Unable to record CSCSimHitCollection " << m_cscCollectionName);
        delete m_cscSimHitCollection; m_cscSimHitCollection=nullptr;
      }
    }
    if ( evtStore()->contains<MMSimHitCollection>(m_mmCollectionName) ){
      if ( (evtStore()->retrieve(m_mmSimHitCollection , m_mmCollectionName)).isFailure() )
        ATH_MSG_ERROR( "[ --- ] Unable to retrieve MMSimHitCollection " << m_mmCollectionName);
      // (b)     if no ... try to create it
    } else {
      m_mmSimHitCollection = new MMSimHitCollection( m_mmCollectionName);
      if ( (evtStore()->record(m_mmSimHitCollection, m_mmCollectionName, true)).isFailure() ) {
        ATH_MSG_ERROR( "[ --- ] Unable to record MMSimHitCollection " << m_mmCollectionName);
        delete m_mmSimHitCollection; m_mmSimHitCollection=nullptr;
      }
    }
    if ( evtStore()->contains<sTGCSimHitCollection>(m_stgcCollectionName) ){
      if ( (evtStore()->retrieve(m_stgcSimHitCollection , m_stgcCollectionName)).isFailure() )
        ATH_MSG_ERROR( "[ --- ] Unable to retrieve sTGCSimHitCollection " << m_stgcCollectionName);
      // (b)     if no ... try to create it
    } else {
      m_stgcSimHitCollection = new sTGCSimHitCollection( m_stgcCollectionName);
      if ( (evtStore()->record(m_stgcSimHitCollection, m_stgcCollectionName, true)).isFailure() ) {
        ATH_MSG_ERROR( "[ --- ] Unable to record sTGCSimHitCollection " << m_stgcCollectionName);
        delete m_stgcSimHitCollection; m_stgcSimHitCollection=nullptr;
      }
    }
  }
}
 
 
//================ Track Creation Interface  =====================================
void iFatras::SimHitCreatorMS::createHits(const ISF::ISFParticle& isp,
                                          const std::vector<Trk::HitInfo>& hits) const {
 
  // iterate and assign as well the layer
  std::vector<Trk::HitInfo>::const_iterator plIter    = hits.begin();
  std::vector<Trk::HitInfo>::const_iterator plIterEnd = hits.end();
  for ( ; plIter != plIterEnd; ++plIter ){
    // get the parameters & associated layer
    const Trk::TrackParameters* parm = (*plIter).trackParms.get();
    double timeInfo = (*plIter).time;
    const Trk::Layer*        currLay = m_extrapolator->trackingGeometry()->associatedLayer( parm->position() );
 
    if (!currLay) continue;
 
    Identifier id(currLay->layerType());
 
    // NSW hits
    if ( m_idHelperSvc->isMM(id) ||  m_idHelperSvc->issTgc(id) ) {
      // hit ID
      int simID = offIdToSimId(id);
      // local position : at MTG layer ( corresponds to the middle of the gas gap )
      // generating particle info
      double mom  = parm->momentum().mag();
      double mass = isp.mass();
      double eKin = sqrt( mom*mom+mass*mass) - mass;
      // the rest of information needs adjustment once full sim hits available
      double energyDeposit = 1.;
      const Amg::Vector3D& pos=parm->position();
      const Amg::Vector3D unitMom=parm->momentum().normalized();
      // cos of incident angle
      float cosAngle = std::abs(unitMom.dot(parm->associatedSurface().normal()));
      float segLengthSTGC = 2.85/cosAngle; // segment length in sTGC gas gap
      // positions where particle enters and exits the sTGC gas gap
      const Amg::Vector3D& entryPos(pos - 0.5*segLengthSTGC*unitMom);
      const Amg::Vector3D& exitPos(pos + 0.5*segLengthSTGC*unitMom);
 
      HepMcParticleLink partLink(HepMC::uniqueID(isp), 0,
                                 HepMcParticleLink::IS_POSITION,
                                 HepMcParticleLink::IS_ID);
      if ( m_idHelperSvc->isMM(id) )  {
        m_mmSimHitCollection->Emplace(simID, timeInfo, pos,
                                      isp.pdgCode(), eKin, unitMom,
                                      energyDeposit, partLink) ;
      }
      else  {
        m_stgcSimHitCollection->Emplace(simID, timeInfo, exitPos,
                                        isp.pdgCode(), unitMom, energyDeposit,
                                        partLink, eKin, entryPos);
      }
 
      ATH_MSG_VERBOSE("[ muhit ] NSW hit created.");
 
    }  else if (m_idHelperSvc->isMdt(id)) {    // (A) special treatment for MDTs to find closest channel and nearby hits
      double pitch = 0.;
      // get the identifier
      Identifier hid = m_measTool->nearestDetEl(currLay,parm,false,pitch);
      //
      if (m_idHelperSvc->mdtIdHelper().valid(hid)) {
        // create first hit
        bool hitCreated = createHit(isp, currLay,parm,hid,timeInfo,pitch, true);
        if (m_createAllMdtHits) {
          // nearby hits - check range
          const MuonGM::MdtReadoutElement* mdtROE = m_muonMgr->getMdtReadoutElement(hid);
          if (!mdtROE) continue;
          int tMax = mdtROE->getNtubesperlayer();
          int tCur = m_idHelperSvc->mdtIdHelper().tube(hid);
          // recalculate id
          int next=-1;
          while (tCur+next>0) {
            Identifier nextId = m_idHelperSvc->mdtIdHelper().channelID(m_idHelperSvc->mdtIdHelper().stationName(hid),
                                                                       m_idHelperSvc->mdtIdHelper().stationEta(hid),
                                                                       m_idHelperSvc->mdtIdHelper().stationPhi(hid),
                                                                       m_idHelperSvc->mdtIdHelper().multilayer(hid),
                                                                       m_idHelperSvc->mdtIdHelper().tubeLayer(hid),
                                                                       tCur+next);
            if (!m_idHelperSvc->mdtIdHelper().valid(nextId)) break;
            hitCreated = createHit(isp, currLay,parm,nextId,timeInfo,pitch,true);
            if (!hitCreated) break;
            next--;
          }
          next = 1;
          while (tCur+next <= tMax) {
            Identifier nextId = m_idHelperSvc->mdtIdHelper().channelID(m_idHelperSvc->mdtIdHelper().stationName(hid),
                                                                       m_idHelperSvc->mdtIdHelper().stationEta(hid),
                                                                       m_idHelperSvc->mdtIdHelper().stationPhi(hid),
                                                                       m_idHelperSvc->mdtIdHelper().multilayer(hid),
                                                                       m_idHelperSvc->mdtIdHelper().tubeLayer(hid),
                                                                       tCur+next);
            if (!m_idHelperSvc->mdtIdHelper().valid(nextId)) break;
            hitCreated = createHit(isp, currLay,parm,nextId,timeInfo,pitch,true);
            if (!hitCreated) break;
            next++;
          }
        }  // hits outside central plane
      }  // hit corresponding to the intersection with the central plane
    } else { // (B) not an MDT nor NSW layer
      double pitch = 0.;
      Identifier hid = m_measTool->nearestDetEl(currLay,parm,false,pitch);
 
      // check if this is valid
      if ( hid.get_identifier32().get_compact()>0 && createHit(isp, currLay,parm,hid,timeInfo,pitch,false) )
        ATH_MSG_VERBOSE("[ muhit ] Hit in MS created.");
      // reset id for the other side
      hid = m_measTool->nearestDetEl(currLay,parm,true,pitch);
      // again check if this is valid
      if ( hid.get_identifier32().get_compact()>0 && createHit(isp, currLay,parm,hid,timeInfo,pitch,true) )
        ATH_MSG_VERBOSE("[ muhit ] Hit in MS created.");
    }  // end of asocciated layer check
  } // end of the loop over TrackParameters
}
 
 
bool iFatras::SimHitCreatorMS::createHit(const ISF::ISFParticle& isp,
                                         const Trk::Layer* lay,const Trk::TrackParameters* parm, Identifier id, double globalTimeEstimate, double /* pitch */, bool /* smear */) const
{
  // MDT SECTION
  if (m_idHelperSvc->isMdt(id)) {
 
    int simId = m_mdtHitIdHelper->BuildMdtHitId(m_idHelperSvc->mdtIdHelper().stationNameString(m_idHelperSvc->mdtIdHelper().stationName(id)),
                                                m_idHelperSvc->mdtIdHelper().stationPhi(id), m_idHelperSvc->mdtIdHelper().stationEta(id),
                                                m_idHelperSvc->mdtIdHelper().multilayer(id), m_idHelperSvc->mdtIdHelper().tubeLayer(id),
                                                m_idHelperSvc->mdtIdHelper().tube(id));
 
    ATH_MSG_VERBOSE(  "[ muhit ] Creating MDTSimHit with identifier " <<  simId );
    // local position from the mdt's i
    const MuonGM::MdtReadoutElement* MdtRoEl = m_muonMgr->getMdtReadoutElement(id);
    if(m_BMGpresent && m_idHelperSvc->mdtIdHelper().stationName(id) == m_BMGid ) {
      auto myIt = m_DeadChannels.find(MdtRoEl->identify());
      if( myIt != m_DeadChannels.end() ){
        if( std::find( (myIt->second).begin(), (myIt->second).end(), id) != (myIt->second).end() ) {
          ATH_MSG_DEBUG("Skipping tube with identifier " << m_idHelperSvc->mdtIdHelper().show_to_string(id) );
          return false;
        }
      }
    }
    // local position from the mdt's
    const Amg::Vector3D  localPos = m_muonMgr->getMdtReadoutElement(id)->globalToLocalTransf(id) * parm->position();
    // drift radius
    double residual = m_measTool->residual(lay,parm,id);
    if (std::abs(residual)<15.075) {
 
      double dlh = sqrt(15.075*15.075-residual*residual);
      double de = 0.02*dlh/15.075;
      double energyDeposit= de + 0.005*CLHEP::RandGaussZiggurat::shoot(m_randomEngine);
      while (energyDeposit<0.)  energyDeposit= de + 0.005*CLHEP::RandGaussZiggurat::shoot(m_randomEngine);
 
      // a new simhit
      HepMcParticleLink partLink(HepMC::uniqueID(isp), 0,
                                 HepMcParticleLink::IS_POSITION,
                                 HepMcParticleLink::IS_ID);
      m_mdtSimHitCollection->Emplace(simId,globalTimeEstimate,
                                     std::abs(residual),
                                     localPos,
                                     partLink,
                                     2*dlh, energyDeposit, isp.pdgCode(),isp.momentum().mag() ) ;
      return true;
    } else {
      return false;
    }
  } else if (m_idHelperSvc->isRpc(id)) {
    // local position from the rpc's
    const Amg::Vector3D localPos = m_muonMgr->getRpcReadoutElement(id)->globalToLocalTransf(id)*parm->position();
    int simId = m_rpcHitIdHelper->BuildRpcHitId(m_idHelperSvc->rpcIdHelper().stationNameString(m_idHelperSvc->rpcIdHelper().stationName(id)),
                                                m_idHelperSvc->rpcIdHelper().stationPhi(id), m_idHelperSvc->rpcIdHelper().stationEta(id),
                                                m_idHelperSvc->rpcIdHelper().doubletZ(id),   m_idHelperSvc->rpcIdHelper().doubletR(id),
                                                m_idHelperSvc->rpcIdHelper().gasGap(id),     m_idHelperSvc->rpcIdHelper().doubletPhi(id),
                                                m_idHelperSvc->rpcIdHelper().measuresPhi(id));
 
    ATH_MSG_VERBOSE(  "[ muhit ] Creating RPCSimHit with identifier " <<  simId );
 
    double energyDeposit= 1.5e-03 + 3.9e-04*CLHEP::RandLandau::shoot(m_randomEngine);
    while (energyDeposit<0.)  energyDeposit= 1.5e-03 + 3.9e-04*CLHEP::RandLandau::shoot(m_randomEngine);
 
    // a new simhit
    HepMcParticleLink partLink(HepMC::uniqueID(isp), 0,
                               HepMcParticleLink::IS_POSITION,
                               HepMcParticleLink::IS_ID);
    m_rpcSimHitCollection->Emplace(simId,globalTimeEstimate, localPos, partLink, localPos, energyDeposit,1.,isp.pdgCode(),isp.momentum().mag() ) ;
 
  } else if (m_idHelperSvc->isTgc(id) && !m_idHelperSvc->tgcIdHelper().isStrip(id) ) {
    // take eta hits only
    // local position
    const Amg::Vector3D localPos = Amg::Translation3D(-1.4, 0., 0.)*m_muonMgr->getTgcReadoutElement(id)->globalToLocalTransf(id)*parm->position();
    // local direction
    Amg::Vector3D localDir = m_muonMgr->getTgcReadoutElement(id)->globalToLocalTransf(id).rotation()*parm->momentum().normalized();
 
    int simId = m_tgcHitIdHelper->BuildTgcHitId(m_idHelperSvc->tgcIdHelper().stationNameString(m_idHelperSvc->tgcIdHelper().stationName(id)),
                                                m_idHelperSvc->tgcIdHelper().stationPhi(id), m_idHelperSvc->tgcIdHelper().stationEta(id),
                                                m_idHelperSvc->tgcIdHelper().gasGap(id));
 
    ATH_MSG_VERBOSE(  "[ muhit ] Creating TGCSimHit with identifier " <<  simId );
 
    // TO DO: adust energy deposit and step length ( 1keV,3 mm ? )
    double energyDeposit= 1.3e-03 + 6.e-04*CLHEP::RandGaussZiggurat::shoot(m_randomEngine);
    while (energyDeposit<0.) energyDeposit= 1.3e-03 + 6.e-04*CLHEP::RandGaussZiggurat::shoot(m_randomEngine);
    double stepLength=3.;
 
    // a new simhit
    HepMcParticleLink partLink(HepMC::uniqueID(isp), 0,
                               HepMcParticleLink::IS_POSITION,
                               HepMcParticleLink::IS_ID);
    m_tgcSimHitCollection->Emplace(simId,globalTimeEstimate, localPos, localDir, partLink, energyDeposit, stepLength ) ;
  } else if (m_idHelperSvc->isCsc(id)) {
    // one of eta/phi hits only
 
    Amg::Vector3D dir(parm->momentum().normalized());
 
    float energyDeposit= 0.24e-03 + 1.1e-03*CLHEP::RandGaussZiggurat::shoot(m_randomEngine);
    while (energyDeposit<0.) energyDeposit= 0.24e-03 + 1.1e-03*CLHEP::RandGaussZiggurat::shoot(m_randomEngine);
    // cos of incident angle
    float cs=std::abs(dir.dot(parm->associatedSurface().normal()));
    float hitlength = 5./cs;
 
    Amg::Vector3D startPos(parm->position()-0.5*hitlength*dir);
    Amg::Vector3D endPos(parm->position()+0.5*hitlength*dir);
    const Amg::Transform3D globalToLocTransf{m_muonMgr->getCscReadoutElement(id)->globalToLocalTransf(id)};
    Amg::Vector3D hitStart = globalToLocTransf*startPos;
    Amg::Vector3D hitEnd   = globalToLocTransf*endPos;
 
    // the lundcode (from CSCSensitiveDetector)
    int lundcode=0;
    int pdgcode= isp.pdgCode();
 
    if (pdgcode == 22) lundcode=1;
    else if (pdgcode == 13 ) lundcode=6;
    else if (pdgcode == -13) lundcode=5;
    else lundcode = 999;
    // else if Trk::nonInteracting  lundcode = 999;
 
    int simId = m_cscHitIdHelper->BuildCscHitId(m_idHelperSvc->cscIdHelper().stationNameString(m_idHelperSvc->cscIdHelper().stationName(id)),
                                                m_idHelperSvc->cscIdHelper().stationPhi(id), m_idHelperSvc->cscIdHelper().stationEta(id),
                                                m_idHelperSvc->cscIdHelper().chamberLayer(id), m_idHelperSvc->cscIdHelper().wireLayer(id));
 
    ATH_MSG_VERBOSE(  "[ muhit ] Creating CSCSimHit with identifier " <<  simId );
 
    // a new simhit
    HepMcParticleLink partLink(HepMC::uniqueID(isp), 0,
                               HepMcParticleLink::IS_POSITION,
                               HepMcParticleLink::IS_ID);
    const double kineticEnergy{-1.}; // dummy value
    m_cscSimHitCollection->Emplace(simId,globalTimeEstimate,energyDeposit, hitStart, hitEnd, lundcode, partLink, kineticEnergy ) ;
  }
 
  return false;
}
 
int iFatras::SimHitCreatorMS::offIdToSimId(Identifier id) const{
 
  if (m_idHelperSvc->isMM(id)) {
 
    int simID = m_mmOffToSimId->convert(id);
 
    //verify
    Identifier check_id = m_mmOffToSimId->convert(simID);
 
    if ( check_id != id ) {
 
      ATH_MSG_WARNING("MM Id conversion error!");
      ATH_MSG_WARNING(m_idHelperSvc->mmIdHelper().print_to_string(id));
      ATH_MSG_WARNING(m_idHelperSvc->mmIdHelper().print_to_string(check_id));
 
    }
 
    return simID;
  } else if (m_idHelperSvc->issTgc(id)) {
 
    int simID = m_stgcOffToSimId->convert(id);
 
    //verify
    Identifier check_id = m_stgcOffToSimId->convert(simID);
 
    if ( check_id != id ) {
 
      ATH_MSG_WARNING("sTGC Id conversion error!");
      ATH_MSG_WARNING(m_idHelperSvc->stgcIdHelper().print_to_string(id));
      ATH_MSG_WARNING(m_idHelperSvc->stgcIdHelper().print_to_string(check_id));
 
    }
 
    return simID;
  }
 
 
  return 0;
}
void iFatras::SimHitCreatorMS::initDeadChannels(const MuonGM::MdtReadoutElement* mydetEl) {
  PVConstLink cv = mydetEl->getMaterialGeom(); // it is "Multilayer"
  int nGrandchildren = cv->getNChildVols();
  if(nGrandchildren <= 0) return;
 
  Identifier detElId = mydetEl->identify();
 
  int name = m_idHelperSvc->mdtIdHelper().stationName(detElId);
  int eta = m_idHelperSvc->mdtIdHelper().stationEta(detElId);
  int phi = m_idHelperSvc->mdtIdHelper().stationPhi(detElId);
  int ml = m_idHelperSvc->mdtIdHelper().multilayer(detElId);
  std::vector<Identifier> deadTubes;
 
  for(int layer = 1; layer <= mydetEl->getNLayers(); layer++){
    for(int tube = 1; tube <= mydetEl->getNtubesperlayer(); tube++){
      bool tubefound = false;
      for(unsigned int kk=0; kk < cv->getNChildVols(); kk++) {
        int tubegeo = cv->getIdOfChildVol(kk).value() % maxNTubesPerLayer;
        int layergeo = ( cv->getIdOfChildVol(kk).value() - tubegeo ) / maxNTubesPerLayer;
        if( tubegeo == tube && layergeo == layer ) {
          tubefound=true;
          break;
        }
        if( layergeo > layer ) break; // don't loop any longer if you cannot find tube anyway anymore
      }
      if(!tubefound) {
        Identifier deadTubeId = m_idHelperSvc->mdtIdHelper().channelID( name, eta, phi, ml, layer, tube );
        deadTubes.push_back( deadTubeId );
        ATH_MSG_VERBOSE("adding dead tube (" << tube  << "), layer(" <<  layer
                        << "), phi(" << phi << "), eta(" << eta << "), name(" << name
                        << "), multilayerId(" << ml << ") and identifier " << deadTubeId <<" .");
      }
    }
  }
  std::sort(deadTubes.begin(), deadTubes.end());
  m_DeadChannels[detElId] = deadTubes;
}