CTPPSRecHitProducer.cc

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// -*- C++ -*-
//
// Package:    FastSimulation/CTPPSRecHitProducer
// Class:      CTPPSRecHitProducer
// 
//
// Original Author:  Dilson De Jesus Damiao
//         Created:  Mon, 19 Sep 2016 18:10:30 GMT
//
//

// system include files
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/stream/EDProducer.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/StreamID.h"
#include <cmath>

#include <CLHEP/Random/RandGauss.h>
#include "FWCore/Utilities/interface/RandomNumberGenerator.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "FWCore/ServiceRegistry/interface/Service.h"

#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/Utilities/interface/EDGetToken.h"
#include "SimDataFormats/TrackingHit/interface/PSimHit.h"
#include "SimDataFormats/TrackingHit/interface/PSimHitContainer.h"
#include <vector>
#include "FWCore/Framework/interface/ConsumesCollector.h"

#include "FastSimDataFormats/CTPPSFastSim/interface/CTPPSFastRecHitContainer.h"
#include "FastSimulation/CTPPSFastGeometry/interface/CTPPSToFDetector.h"
#include "Utilities/PPS/interface/PPSUnitConversion.h"

#include "DataFormats/GeometryVector/interface/LocalPoint.h"
#include "DataFormats/GeometryVector/interface/LocalVector.h"
#include <iostream>

#include <string>

//Mixing Collection and CF info
#include "SimDataFormats/CrossingFrame/interface/MixCollection.h"
#include "SimDataFormats/CrossingFrame/interface/CrossingFrame.h"
#include "HepMC/GenEvent.h"


//
// class declaration
//
class TRandom3;
class CTPPSToFDetector;  

class CTPPSRecHitProducer : public edm::stream::EDProducer<> {
    public:
        explicit CTPPSRecHitProducer(const edm::ParameterSet&);
        ~CTPPSRecHitProducer() override;

    private:
        void beginStream(edm::StreamID) override;
        void produce(edm::Event&, const edm::EventSetup&) override;
        void endStream() override;

        // ----------member data ---------------------------
        typedef std::vector<PSimHit> PSimHitContainer;

//  std::string mix_;
//      std::string collection_for_XF;
 
    edm::EDGetTokenT<CrossingFrame<PSimHit> > cf_token;

    double fTrackerWidth,fTrackerHeight,fTrackerInsertion,fBeamXRMS_Trk1,fBeamXRMS_Trk2,fTrk1XOffset,fTrk2XOffset;
    double fHitSigmaX,fHitSigmaY,fHitSigmaZ;
    std::vector<double> fToFCellWidth;
    double fToFCellHeight,fToFPitchX,fToFPitchY;
    int fToFNCellX,fToFNCellY;
    double fToFInsertion,fBeamXRMS_ToF,fToFXOffset,fTimeSigma;
    

};

CTPPSRecHitProducer::CTPPSRecHitProducer(const edm::ParameterSet& iConfig)
{
    produces<edm::CTPPSFastRecHitContainer>("CTPPSFastRecHits");

      //Name of Collection use for create the XF 
      std::string mix_ = iConfig.getParameter<std::string>("mixLabel");
      std::string collection_for_XF = iConfig.getParameter<std::string>("InputCollection");
      cf_token = consumes<CrossingFrame<PSimHit> >( edm::InputTag(mix_, collection_for_XF) );   

      // Read the detector parameters
      fTrackerWidth       = iConfig.getParameter<double>("TrackerWidth");
      fTrackerHeight      = iConfig.getParameter<double>("TrackerHeight");
      fTrackerInsertion   = iConfig.getParameter<double>("TrackerInsertion");
      fBeamXRMS_Trk1 = iConfig.getParameter<double>("BeamXRMS_Trk1");
      fBeamXRMS_Trk2 = iConfig.getParameter<double>("BeamXRMS_Trk2");   
      fTrk1XOffset = iConfig.getParameter<double>("Trk1XOffset");
      fTrk2XOffset = iConfig.getParameter<double>("Trk2XOffset");                           
      fHitSigmaX = iConfig.getParameter<double>("HitSigmaX");
      fHitSigmaY = iConfig.getParameter<double>("HitSigmaY");       
      fHitSigmaZ = iConfig.getParameter<double>("HitSigmaZ");
      fToFCellWidth = iConfig.getUntrackedParameter<std::vector<double> >("ToFCellWidth");
      fToFCellHeight = iConfig.getParameter<double>("ToFCellHeight");   
      fToFPitchX = iConfig.getParameter<double>("ToFPitchX");
      fToFPitchY = iConfig.getParameter<double>("ToFPitchY");                   
      fToFNCellX          = iConfig.getParameter<int>("ToFNCellX");
      fToFNCellY          = iConfig.getParameter<int>("ToFNCellY");
      fToFInsertion       = iConfig.getParameter<double>("ToFInsertion"); 
      fBeamXRMS_ToF =  iConfig.getParameter<double>("BeamXRMS_ToF");
      fToFXOffset =  iConfig.getParameter<double>("ToFXOffset");
      fTimeSigma =  iConfig.getParameter<double>("TimeSigma");

      edm::Service<edm::RandomNumberGenerator> rng;
      if ( ! rng.isAvailable() ) {
          throw cms::Exception("Configuration")
            << "CTPPSRecHitProducer requires the RandomNumberGeneratorService\n"
            "which is not present in the configuration file.  You must add the service\n"
            "in the configuration file or remove the modules that require it.";
     }
                        
    
}


CTPPSRecHitProducer::~CTPPSRecHitProducer()
{

}


void
CTPPSRecHitProducer::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
    using namespace edm;

    edm::Service<edm::RandomNumberGenerator> rng;
    CLHEP::HepRandomEngine* engine = &rng->getEngine(iEvent.streamID());
    if ( engine->name() != "TRandom3" ) {
        throw cms::Exception("Configuration")
            << "The TRandom3 engine type must be used with CTPPSRecHitProducer, Random Number Generator Service not correctly configured!";
    }   

        //Mix the PSimHits for pileup
    Handle<CrossingFrame<PSimHit> > xFrame;
    iEvent.getByToken(cf_token, xFrame);

    std::unique_ptr<MixCollection<PSimHit> >
    simHits( new MixCollection<PSimHit>(xFrame.product()) );

        std::vector<CTPPSFastRecHit> theCTPPSFastRecHit;

  for(MixCollection<PSimHit>::MixItr ihit = simHits->begin();ihit != simHits->end(); ihit++)

     {
    const PSimHit* simHit = &(*ihit);
    unsigned int detlayerId = simHit->detUnitId(); 
        // DetId layer codification for PSimHit 
        // 2014314496 -> Tracker1 zPositive
        // 2014838784 -> Tracker2 zPositive
        // 2046820352 -> Timing   zPositive
        // 2031091712 -> Tracker1 zNegative
        // 2031616000 -> Tracker2 zNegative
        // 2063597568 -> Timing   zNegative
        bool outside = false;

        //Make Tracker RecHits by smearing the SimHits positions and applying fiducial cuts 
        CTPPSFastRecHit rechit; // (const Local3DPoint& entry, unsigned int detId, float tof, unsigned int cellId)
        if(detlayerId == 2014314496 || detlayerId == 2031091712) {
            // Apply position smearing
            float x_trk1 = simHit->entryPoint().x()+ CLHEP::RandGauss::shoot(engine,0,fHitSigmaX*um_to_mm);
            float y_trk1 = simHit->entryPoint().y()+ CLHEP::RandGauss::shoot(engine,0,fHitSigmaY*um_to_mm);
            float z_trk1 = simHit->entryPoint().z();

            // Apply fiducial cuts
            double pos_trk1 = fTrackerInsertion*fBeamXRMS_Trk1+fTrk1XOffset;
            if(x_trk1 >0 || fabs(x_trk1)<pos_trk1 || fabs(x_trk1)>(fTrackerWidth+pos_trk1) || fabs(y_trk1)>fTrackerHeight/2.)outside = true;

            float tof = 0.0;
            unsigned int cellId = 1;
            Local3DPoint xyzzy = Local3DPoint(x_trk1,y_trk1,z_trk1);
            if (!outside){ 
                rechit.setLocal3DPoint(xyzzy);  
                rechit.setTof(tof);
                rechit.setDetUnitId(detlayerId);
                rechit.setCellId(cellId);
                theCTPPSFastRecHit.push_back(rechit);
            }
        }
        if(detlayerId == 2014838784 || detlayerId == 2031616000) {

            // Apply position smearing
            double x_trk2 = simHit->entryPoint().x()+ CLHEP::RandGauss::shoot(engine,0,fHitSigmaX*um_to_mm);
            double y_trk2 = simHit->entryPoint().y()+ CLHEP::RandGauss::shoot(engine,0,fHitSigmaY*um_to_mm);
            double z_trk2 = simHit->entryPoint().z();   
            // Apply fiducial cuts
            double pos_trk2 = fTrackerInsertion*fBeamXRMS_Trk2+fTrk2XOffset; 
            if(x_trk2 >0 || fabs(x_trk2)<pos_trk2 || fabs(x_trk2)>(fTrackerWidth+pos_trk2) || fabs(y_trk2)>fTrackerHeight/2.)outside = true;    

            float tof = 0.0;
            unsigned int cellId = 2;
            Local3DPoint  xyzzy = Local3DPoint(x_trk2,y_trk2,z_trk2);
            if (!outside){
                rechit.setLocal3DPoint(xyzzy);
                rechit.setTof(tof);
                rechit.setDetUnitId(detlayerId);
                rechit.setCellId(cellId);
                theCTPPSFastRecHit.push_back(rechit);
            } 
        }
        //Make Timing RecHits by smearing the SimHits time of flight and checking the cell of the hit
        //The RecHit position is the centre of the cell 
        if(detlayerId == 2046820352 || detlayerId == 2063597568) {
            float t = simHit->tof();
            unsigned int cellId = 0; 
            float tof = CLHEP::RandGauss::shoot(engine,t,fTimeSigma);
            double x_tof = simHit->entryPoint().x();
            double y_tof = simHit->entryPoint().y();

            double pos_tof = fToFInsertion*fBeamXRMS_ToF+fToFXOffset;
             
            std::vector<double> vToFCellWidth; 
            for (int i = 0 ; i < 8 ; i++){
                vToFCellWidth.push_back(fToFCellWidth[i]); 
            } 
            CTPPSToFDetector *ToFDet = new CTPPSToFDetector(fToFNCellX,fToFNCellY,vToFCellWidth,fToFCellHeight,fToFPitchX,fToFPitchY,pos_tof,fTimeSigma);
            cellId = ToFDet->findCellId(x_tof,y_tof);
            if(cellId>0){
                double xc_tof =0., yc_tof=0.; 
                ToFDet->get_CellCenter(cellId, xc_tof, yc_tof);
                Local3DPoint xyzzy = Local3DPoint(xc_tof,yc_tof,simHit->entryPoint().z());
                rechit.setLocal3DPoint(xyzzy);
                rechit.setTof(tof);
                rechit.setDetUnitId(detlayerId);
                rechit.setCellId(cellId);
                theCTPPSFastRecHit.push_back(rechit);
            }    
        }


    }

    std::unique_ptr<CTPPSFastRecHitContainer> output_recHits(new edm::CTPPSFastRecHitContainer);
    output_recHits->reserve(simHits->size());   

    int  n = 0;
    for ( std::vector<CTPPSFastRecHit>::const_iterator i = theCTPPSFastRecHit.begin();
            i != theCTPPSFastRecHit.end(); i++ ) {
        output_recHits->push_back(*i);
        n += 1;
    }

    iEvent.put(std::move(output_recHits),"CTPPSFastRecHits");

}

// ------------ method called once each stream before processing any runs, lumis or events  ------------
    void
CTPPSRecHitProducer::beginStream(edm::StreamID)
{
}

// ------------ method called once each stream after processing all runs, lumis and events  ------------
void
CTPPSRecHitProducer::endStream() {
}


//define this as a plug-in
DEFINE_FWK_MODULE(CTPPSRecHitProducer);