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RPCSimTriv.cc

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#include "Geometry/RPCGeometry/interface/RPCRoll.h"
#include "Geometry/RPCGeometry/interface/RPCRollSpecs.h"
#include "SimMuon/RPCDigitizer/src/RPCSimTriv.h"
#include "Geometry/CommonTopologies/interface/RectangularStripTopology.h"
#include "Geometry/CommonTopologies/interface/TrapezoidalStripTopology.h"
#include "Geometry/RPCGeometry/interface/RPCGeometry.h"
#include "SimMuon/RPCDigitizer/src/RPCSimSetUp.h"

#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/RandomNumberGenerator.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "CLHEP/Random/RandomEngine.h"
#include "CLHEP/Random/RandFlat.h"
#include <cmath>
#include <utility>
#include <map>

#include "CLHEP/config/CLHEP.h"
#include "CLHEP/Random/Random.h"
#include "CLHEP/Random/RandFlat.h"
#include "CLHEP/Random/RandPoissonQ.h"


RPCSimTriv::RPCSimTriv(const edm::ParameterSet& config) : RPCSim(config){

  rate=config.getParameter<double>("Rate");
  nbxing=config.getParameter<int>("Nbxing");
  gate=config.getParameter<double>("Gate");

  edm::Service<edm::RandomNumberGenerator> rng;
  if ( ! rng.isAvailable()) {
    throw cms::Exception("Configuration")
      << "RPCDigitizer 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.";
  }
  _rpcSync = new RPCSynchronizer(config);

  rndEngine = &(rng->getEngine());
}

RPCSimTriv::~RPCSimTriv(){}

void
RPCSimTriv::simulate(const RPCRoll* roll,
                       const edm::PSimHitContainer& rpcHits)
{

  _rpcSync->setRPCSimSetUp(getRPCSimSetUp());
  theRpcDigiSimLinks.clear();
  theDetectorHitMap.clear();
  theRpcDigiSimLinks = RPCDigiSimLinks(roll->id().rawId());

  const Topology& topology=roll->specs()->topology();
  for (edm::PSimHitContainer::const_iterator _hit = rpcHits.begin();
       _hit != rpcHits.end(); ++_hit){

    int type = _hit->particleType();
    if (type == 13 || type == -13){
      // Here I hould check if the RPC are up side down;
      const LocalPoint& entr=_hit->entryPoint();
      int time_hit = _rpcSync->getSimHitBx(&(*_hit));
      std::pair<int, int> digi(topology.channel(entr)+1,
                               time_hit);

      theDetectorHitMap.insert(DetectorHitMap::value_type(digi,&(*_hit)));
      strips.insert(digi);
    }
  }
}


void RPCSimTriv::simulateNoise(const RPCRoll* roll)
{

  RPCDetId rpcId = roll->id();
  int nstrips = roll->nstrips();
  double area = 0.0;
  
  if ( rpcId.region() == 0 )
    {
      const RectangularStripTopology* top_ = dynamic_cast<const
        RectangularStripTopology*>(&(roll->topology()));
      float xmin = (top_->localPosition(0.)).x();
      float xmax = (top_->localPosition((float)roll->nstrips())).x();
      float striplength = (top_->stripLength());
      area = striplength*(xmax-xmin);
    }
  else
    {
      const TrapezoidalStripTopology* top_=dynamic_cast<const TrapezoidalStripTopology*>(&(roll->topology()));
      float xmin = (top_->localPosition(0.)).x();
      float xmax = (top_->localPosition((float)roll->nstrips())).x();
      float striplength = (top_->stripLength());
      area = striplength*(xmax-xmin);
    }
  
  double ave = rate*nbxing*gate*area*1.0e-9;
  poissonDistribution_ = new CLHEP::RandPoissonQ(rndEngine, ave);
  N_hits = poissonDistribution_->fire();

  for (int i = 0; i < N_hits; i++ ){

    flatDistribution = new CLHEP::RandFlat(rndEngine, 1, nstrips);
    int strip = static_cast<int>(flatDistribution->fire());
    int time_hit;

    flatDistribution = new CLHEP::RandFlat(rndEngine, (nbxing*gate)/gate);
    time_hit = (static_cast<int>(flatDistribution->fire())) - nbxing/2;
    
    std::pair<int, int> digi(strip,time_hit);
    strips.insert(digi);
  }

}

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