#include <CTPPSDiamondRecHitProducerAlgorithm.h>

Public Member Functions
void	build (const CTPPSGeometry &, const edm::DetSetVector< CTPPSDiamondDigi > &, edm::DetSetVector< CTPPSDiamondRecHit > &)

	CTPPSDiamondRecHitProducerAlgorithm (const edm::ParameterSet &conf)

void	setCalibration (const PPSTimingCalibration &, const PPSTimingCalibrationLUT &)

Private Attributes
bool	apply_calib_
	Switch on/off the timing calibration. More...

PPSTimingCalibration	calib_

std::unique_ptr< reco::FormulaEvaluator >	calib_fct_

PPSTimingCalibrationLUT	calibLUT_

double	ts_to_ns_
	Conversion constant between HPTDC time slice and absolute time (in ns) More...

Static Private Attributes
static constexpr unsigned short	MAX_CHANNEL = 20

Detailed Description

Definition at line 27 of file CTPPSDiamondRecHitProducerAlgorithm.h.

Constructor & Destructor Documentation

◆ CTPPSDiamondRecHitProducerAlgorithm()

CTPPSDiamondRecHitProducerAlgorithm::CTPPSDiamondRecHitProducerAlgorithm ( const edm::ParameterSet & conf )

Definition at line 15 of file CTPPSDiamondRecHitProducerAlgorithm.cc.

16 : ts_to_ns_(iConfig.getParameter<double>("timeSliceNs")),

17 apply_calib_(iConfig.getParameter<bool>("applyCalibration")) {}

CTPPSDiamondRecHitProducerAlgorithm::apply_calib_

bool apply_calib_

Switch on/off the timing calibration.

Definition: CTPPSDiamondRecHitProducerAlgorithm.h:39

CTPPSDiamondRecHitProducerAlgorithm::ts_to_ns_

double ts_to_ns_

Conversion constant between HPTDC time slice and absolute time (in ns)

Definition: CTPPSDiamondRecHitProducerAlgorithm.h:37

Member Function Documentation

◆ build()

void CTPPSDiamondRecHitProducerAlgorithm::build	(	const CTPPSGeometry &	geom,
		const edm::DetSetVector< CTPPSDiamondDigi > &	input,
		edm::DetSetVector< CTPPSDiamondRecHit > &	output
	)

Definition at line 26 of file CTPPSDiamondRecHitProducerAlgorithm.cc.

References apply_calib_, PPSTimingCalibrationLUT::bins(), calib_, calib_fct_, calibLUT_, edm::DetSet< T >::emplace_back(), relativeConstraints::geom, DetGeomDesc::getDiamondDimensions(), input, edm::isNotFinite(), MAX_CHANNEL, convertSQLitetoXML_cfg::output, PPSTimingCalibration::parameters(), DetGeomDesc::parentZPosition(), relativeConstraints::station, FrontierCondition_GT_autoExpress_cfi::t0, PPSTimingCalibration::timeOffset(), PPSTimingCalibration::timePrecision(), CTPPSDiamondRecHit::TIMESLICE_WITHOUT_LEADING, compareTotals::tot, DetGeomDesc::translation(), ts_to_ns_, and DiamondDimensions::xHalfWidth.

Referenced by CTPPSDiamondRecHitProducer::produce().

                                                                                              {
   for (const auto& vec : input) {
     const CTPPSDiamondDetId detid(vec.detId());
 
     if (detid.channel() > MAX_CHANNEL)  // VFAT-like information, to be ignored
       continue;
 
     // retrieve the geometry element associated to this DetID
     const DetGeomDesc* det = geom.sensor(detid);
 
     const float x_pos = det->translation().x(), y_pos = det->translation().y();
     float z_pos = 0.;
     z_pos = det->parentZPosition();  // retrieve the plane position;
 
     // parameters stand for half the size
     const auto& diamondDimensions = det->getDiamondDimensions();
     const float x_width = 2.0 * diamondDimensions.xHalfWidth;
     const float y_width = 2.0 * diamondDimensions.yHalfWidth;
     const float z_width = 2.0 * diamondDimensions.zHalfWidth;
 
     const int sector = detid.arm(), station = detid.station(), plane = detid.plane(), channel = detid.channel();
     //LUT calibration
     std::vector<double> lut;
     if (apply_calib_) {
       lut = calibLUT_.bins(sector, station, plane, channel);
       if (lut.size() != 1024)
         lut = std::vector<double>(1024, 0.0);
     } else
       lut = std::vector<double>(1024, 0.0);
 
     // retrieve the timing calibration part for this channel
     const auto& ch_params = (apply_calib_) ? calib_.parameters(sector, station, plane, channel) : std::vector<double>{};
     // default values for offset + time precision if calibration object not found
     const double ch_t_offset = (apply_calib_) ? calib_.timeOffset(sector, station, plane, channel) : 0.;
     const double ch_t_precis = (apply_calib_) ? calib_.timePrecision(sector, station, plane, channel) : 0.;
 
     edm::DetSet<CTPPSDiamondRecHit>& rec_hits = output.find_or_insert(detid);
 
     for (const auto& digi : vec) {
       const int t_lead = digi.leadingEdge(), t_trail = digi.trailingEdge();
       // skip invalid digis
       if (t_lead == 0 && t_trail == 0)
         continue;
 
       double tot = -1., ch_t_twc = 0.;
       if (t_lead != 0 && t_trail != 0) {
         tot = (t_trail - t_lead) * ts_to_ns_;  // in ns
         if (calib_fct_ && apply_calib_ && !ch_params.empty()) {
           // compute the time-walk correction
           ch_t_twc = calib_fct_->evaluate(std::vector<double>{tot}, ch_params);
           if (edm::isNotFinite(ch_t_twc))
             ch_t_twc = 0.;
         }
       }
 
       const int time_slice =
           (t_lead != 0) ? (t_lead - ch_t_offset / ts_to_ns_) / 1024 : CTPPSDiamondRecHit::TIMESLICE_WITHOUT_LEADING;
 
       // calibrated time of arrival
       const double t0 = (t_lead % 1024) * ts_to_ns_ + lut[t_lead % 1024] - ch_t_twc;
       rec_hits.emplace_back(
           // spatial information
           x_pos,
           x_width,
           y_pos,
           y_width,
           z_pos,
           z_width,
           // timing information
           t0,
           tot,
           ch_t_precis,
           time_slice,
           // readout information
           digi.hptdcErrorFlags(),
           digi.multipleHit());
     }
   }
 }

◆ setCalibration()

void CTPPSDiamondRecHitProducerAlgorithm::setCalibration	(	const PPSTimingCalibration &	calib,
		const PPSTimingCalibrationLUT &	calibLUT
	)

Definition at line 19 of file CTPPSDiamondRecHitProducerAlgorithm.cc.

References L1EGammaClusterEmuProducer_cfi::calib, calib_, calib_fct_, calibLUT_, and PPSTimingCalibration::formula().

Referenced by CTPPSDiamondRecHitProducer::produce().

                                                                                                   {
   calib_ = calib;
   calibLUT_ = calibLUT;
   calib_fct_ = std::make_unique<reco::FormulaEvaluator>(calib_.formula());
 }