PPSTimingCalibrationPCLHarvester.cc

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/****************************************************************************
 *
 * This is a part of PPS offline software.
 * Authors:
 *   Edoardo Bossini
 *   Piotr Maciej Cwiklicki
 *   Laurent Forthomme
 *
 ****************************************************************************/
 
#include "DQMServices/Core/interface/DQMEDHarvester.h"
 
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
 
#include "Geometry/VeryForwardGeometryBuilder/interface/CTPPSGeometry.h"
#include "Geometry/Records/interface/VeryForwardRealGeometryRecord.h"
 
#include "CalibPPS/TimingCalibration/interface/TimingCalibrationStruct.h"
#include "CondCore/DBOutputService/interface/PoolDBOutputService.h"
 
#include "DataFormats/CTPPSDetId/interface/CTPPSDiamondDetId.h"
#include "CondFormats/PPSObjects/interface/PPSTimingCalibration.h"
 
//------------------------------------------------------------------------------
 
class PPSTimingCalibrationPCLHarvester : public DQMEDHarvester {
public:
  PPSTimingCalibrationPCLHarvester(const edm::ParameterSet&);
  void beginRun(const edm::Run&, const edm::EventSetup&) override;
 
  static void fillDescriptions(edm::ConfigurationDescriptions&);
 
private:
  void dqmEndJob(DQMStore::IBooker&, DQMStore::IGetter&) override;
  edm::ESGetToken<CTPPSGeometry, VeryForwardRealGeometryRecord> geomEsToken_;
  std::vector<CTPPSDiamondDetId> detids_;
  const std::string dqmDir_;
  const std::string formula_;
  const unsigned int min_entries_;
  TF1 interp_;
};
 
//------------------------------------------------------------------------------
 
PPSTimingCalibrationPCLHarvester::PPSTimingCalibrationPCLHarvester(const edm::ParameterSet& iConfig)
    : geomEsToken_(esConsumes<edm::Transition::BeginRun>()),
      dqmDir_(iConfig.getParameter<std::string>("dqmDir")),
      formula_(iConfig.getParameter<std::string>("formula")),
      min_entries_(iConfig.getParameter<unsigned int>("minEntries")),
      interp_("interp", formula_.c_str(), 10.5, 25.) {
  // first ensure DB output service is available
  edm::Service<cond::service::PoolDBOutputService> poolDbService;
  if (!poolDbService.isAvailable())
    throw cms::Exception("PPSTimingCalibrationPCLHarvester") << "PoolDBService required";
 
  // constrain the min/max fit values
  interp_.SetParLimits(1, 9., 15.);
  interp_.SetParLimits(2, 0.2, 2.5);
}
 
//------------------------------------------------------------------------------
 
void PPSTimingCalibrationPCLHarvester::beginRun(const edm::Run& iRun, const edm::EventSetup& iSetup) {
  const auto& geom = iSetup.getData(geomEsToken_);
  for (auto it = geom.beginSensor(); it != geom.endSensor(); ++it) {
    if (!CTPPSDiamondDetId::check(it->first))
      continue;
    const CTPPSDiamondDetId detid(it->first);
    if (detid.station() == 1)  // for the time being, only compute for this station (run 2 diamond)
      detids_.emplace_back(detid);
  }
}
 
//------------------------------------------------------------------------------
 
void PPSTimingCalibrationPCLHarvester::dqmEndJob(DQMStore::IBooker& iBooker, DQMStore::IGetter& iGetter) {
  // book the parameters containers
  PPSTimingCalibration::ParametersMap calib_params;
  PPSTimingCalibration::TimingMap calib_time;
 
  iGetter.cd();
  iGetter.setCurrentFolder(dqmDir_);
 
  // compute the fit parameters for all monitored channels
  TimingCalibrationHistograms hists;
  std::string ch_name;
  for (const auto& detid : detids_) {
    detid.channelName(ch_name);
    const auto chid = detid.rawId();
    const PPSTimingCalibration::Key key{
        (int)detid.arm(), (int)detid.station(), (int)detid.plane(), (int)detid.channel()};
    hists.leadingTime[chid] = iGetter.get("t_" + ch_name);
    if (hists.leadingTime[chid] == nullptr) {
      edm::LogInfo("PPSTimingCalibrationPCLHarvester:dqmEndJob")
          << "Failed to retrieve leading time monitor for channel (" << detid << ").";
      continue;
    }
    hists.toT[chid] = iGetter.get("tot_" + ch_name);
    if (hists.toT[chid] == nullptr) {
      edm::LogInfo("PPSTimingCalibrationPCLHarvester:dqmEndJob")
          << "Failed to retrieve time over threshold monitor for channel (" << detid << ").";
      continue;
    }
    hists.leadingTimeVsToT[chid] = iGetter.get("tvstot_" + ch_name);
    if (hists.leadingTimeVsToT[chid] == nullptr) {
      edm::LogInfo("PPSTimingCalibrationPCLHarvester:dqmEndJob")
          << "Failed to retrieve leading time vs. time over threshold monitor for channel (" << detid << ").";
      continue;
    }
    if (min_entries_ > 0 && hists.leadingTimeVsToT[chid]->getEntries() < min_entries_) {
      edm::LogWarning("PPSTimingCalibrationPCLHarvester:dqmEndJob")
          << "Not enough entries for channel (" << detid << "): " << hists.leadingTimeVsToT[chid]->getEntries() << " < "
          << min_entries_ << ". Skipping calibration.";
      continue;
    }
    const double upper_tot_range = hists.toT[chid]->getMean() + 2.5;
    {  // scope for x-profile
      std::unique_ptr<TProfile> prof(hists.leadingTimeVsToT[chid]->getTH2D()->ProfileX("_prof_x", 1, -1));
      interp_.SetParameters(hists.leadingTime[chid]->getRMS(),
                            hists.toT[chid]->getMean(),
                            0.8,
                            hists.leadingTime[chid]->getMean() - hists.leadingTime[chid]->getRMS());
      const auto& res = prof->Fit(&interp_, "B+", "", 10.4, upper_tot_range);
      if ((bool)res) {
        calib_params[key] = {
            interp_.GetParameter(0), interp_.GetParameter(1), interp_.GetParameter(2), interp_.GetParameter(3)};
        calib_time[key] = std::make_pair(0.1, 0.);  // hardcoded resolution/offset placeholder for the time being
        // can possibly do something with interp_.GetChiSquare() in the near future
      } else
        edm::LogWarning("PPSTimingCalibrationPCLHarvester:dqmEndJob")
            << "Fit did not converge for channel (" << detid << ").";
    }
  }
 
  // fill the DB object record
  PPSTimingCalibration calib(formula_, calib_params, calib_time);
 
  // write the object
  edm::Service<cond::service::PoolDBOutputService> poolDbService;
  poolDbService->writeOne(&calib, poolDbService->currentTime(), "PPSTimingCalibrationRcd");
}
 
//------------------------------------------------------------------------------
 
void PPSTimingCalibrationPCLHarvester::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  edm::ParameterSetDescription desc;
  desc.add<std::string>("dqmDir", "AlCaReco/PPSTimingCalibrationPCL")
      ->setComment("input path for the various DQM plots");
  desc.add<std::string>("formula", "[0]/(exp((x-[1])/[2])+1)+[3]")
      ->setComment("interpolation formula for the time walk component");
  desc.add<unsigned int>("minEntries", 100)->setComment("minimal number of hits to extract calibration");
  descriptions.addWithDefaultLabel(desc);
}
 
DEFINE_FWK_MODULE(PPSTimingCalibrationPCLHarvester);