ETLElectronicsSim.cc

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#include "SimFastTiming/FastTimingCommon/interface/ETLElectronicsSim.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "CLHEP/Random/RandGaussQ.h"

using namespace mtd;

ETLElectronicsSim::ETLElectronicsSim(const edm::ParameterSet& pset)
    : debug_(pset.getUntrackedParameter<bool>("debug", false)),
      bxTime_(pset.getParameter<double>("bxTime")),
      sigmaEta_(pset.getParameter<std::string>("etaResolution")),
      adcNbits_(pset.getParameter<uint32_t>("adcNbits")),
      tdcNbits_(pset.getParameter<uint32_t>("tdcNbits")),
      adcSaturation_MIP_(pset.getParameter<double>("adcSaturation_MIP")),
      adcLSB_MIP_(adcSaturation_MIP_ / std::pow(2., adcNbits_)),
      adcThreshold_MIP_(pset.getParameter<double>("adcThreshold_MIP")),
      toaLSB_ns_(pset.getParameter<double>("toaLSB_ns")) {}

void ETLElectronicsSim::run(const mtd::MTDSimHitDataAccumulator& input,
                            ETLDigiCollection& output,
                            CLHEP::HepRandomEngine* hre) const {
  MTDSimHitData chargeColl, toa;

  std::vector<double> emptyV;
  std::vector<double> eta(1);

  for (MTDSimHitDataAccumulator::const_iterator it = input.begin(); it != input.end(); it++) {
    chargeColl.fill(0.f);
    toa.fill(0.f);
    for (size_t i = 0; i < it->second.hit_info[0].size(); i++) {
      if ((it->second).hit_info[0][i] < adcThreshold_MIP_)
        continue;

      // time of arrival
      float finalToA = (it->second).hit_info[1][i];

      // Gaussian smearing of the time of arrival
      eta[0] = 2.;  // This is just temporary. Once the RECO geometry is
                    // available, the actual module eta will be used.
      double sigmaToA = sigmaEta_.evaluate(eta, emptyV);

      if (sigmaToA > 0.)
        finalToA += CLHEP::RandGaussQ::shoot(hre, 0., sigmaToA);

      // fill the time and charge arrays
      const unsigned int ibucket = std::floor(finalToA / bxTime_);
      if ((i + ibucket) >= chargeColl.size())
        continue;

      chargeColl[i + ibucket] += (it->second).hit_info[0][i];

      if (toa[i + ibucket] == 0. || (finalToA - ibucket * bxTime_) < toa[i + ibucket])
        toa[i + ibucket] = finalToA - ibucket * bxTime_;
    }

    // run the shaper to create a new data frame
    ETLDataFrame rawDataFrame(it->first.detid_);
    runTrivialShaper(rawDataFrame, chargeColl, toa, it->first.row_, it->first.column_);
    updateOutput(output, rawDataFrame);
  }
}

void ETLElectronicsSim::runTrivialShaper(ETLDataFrame& dataFrame,
                                         const mtd::MTDSimHitData& chargeColl,
                                         const mtd::MTDSimHitData& toa,
                                         const uint8_t row,
                                         const uint8_t col) const {
  bool debug = debug_;
#ifdef EDM_ML_DEBUG
  for (int it = 0; it < (int)(chargeColl.size()); it++)
    debug |= (chargeColl[it] > adcThreshold_fC_);
#endif

  if (debug)
    edm::LogVerbatim("ETLElectronicsSim") << "[runTrivialShaper]" << std::endl;

  //set new ADCs
  for (int it = 0; it < (int)(chargeColl.size()); it++) {
    //brute force saturation, maybe could to better with an exponential like saturation
    const uint32_t adc = std::floor(std::min(chargeColl[it], adcSaturation_MIP_) / adcLSB_MIP_);
    const uint32_t tdc_time = std::floor(toa[it] / toaLSB_ns_);
    ETLSample newSample;
    newSample.set(chargeColl[it] > adcThreshold_MIP_, false, tdc_time, adc, row, col);
    dataFrame.setSample(it, newSample);

    if (debug)
      edm::LogVerbatim("ETLElectronicsSim") << adc << " (" << chargeColl[it] << "/" << adcLSB_MIP_ << ") ";
  }

  if (debug) {
    std::ostringstream msg;
    dataFrame.print(msg);
    edm::LogVerbatim("ETLElectronicsSim") << msg.str() << std::endl;
  }
}

void ETLElectronicsSim::updateOutput(ETLDigiCollection& coll, const ETLDataFrame& rawDataFrame) const {
  int itIdx(9);
  if (rawDataFrame.size() <= itIdx + 2)
    return;

  ETLDataFrame dataFrame(rawDataFrame.id());
  dataFrame.resize(dfSIZE);
  bool putInEvent(false);
  for (int it = 0; it < dfSIZE; ++it) {
    dataFrame.setSample(it, rawDataFrame[itIdx - 2 + it]);
    if (it == 2)
      putInEvent = rawDataFrame[itIdx - 2 + it].threshold();
  }

  if (putInEvent) {
    coll.push_back(dataFrame);
  }
}