ZdcSimpleRecAlgo.cc

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#include "RecoLocalCalo/HcalRecAlgos/interface/ZdcSimpleRecAlgo.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "CalibCalorimetry/HcalAlgos/interface/HcalTimeSlew.h"
#include <algorithm> // for "max"
#include <iostream>
#include <math.h>



static double MaximumFractionalError = 0.0005; // 0.05% error allowed from this source

ZdcSimpleRecAlgo::ZdcSimpleRecAlgo(int firstSample, int samplesToAdd, bool correctForTimeslew, bool correctForPulse, float phaseNS, int recoMethod) : 
  firstSample_(firstSample), 
  samplesToAdd_(samplesToAdd),
  recoMethod_(recoMethod),
  correctForTimeslew_(correctForTimeslew) {
  if (correctForPulse) 
    pulseCorr_=std::auto_ptr<HcalPulseContainmentCorrection>(new HcalPulseContainmentCorrection(samplesToAdd_,phaseNS,MaximumFractionalError));
}

ZdcSimpleRecAlgo::ZdcSimpleRecAlgo(int firstSample, int samplesToAdd, int recoMethod) : 
  firstSample_(firstSample), 
  samplesToAdd_(samplesToAdd),
  recoMethod_(recoMethod),
  correctForTimeslew_(false) {
}

static float timeshift_ns_zdc(float wpksamp);

namespace ZdcSimpleRecAlgoImpl {
  template<class Digi, class RecHit>
  inline RecHit reco1(const Digi& digi, const HcalCoder& coder, const HcalCalibrations& calibs, 
             int ifirst, int n, bool slewCorrect, const HcalPulseContainmentCorrection* corr, HcalTimeSlew::BiasSetting slewFlavor) {
    CaloSamples tool;
    coder.adc2fC(digi,tool);
    double ampl=0; int maxI = -1; double maxA = -1e10; double ta=0;
    double fc_ampl=0;
    for (int i=ifirst; i<tool.size() && i<n+ifirst; i++) {
      int capid=digi[i].capid();
      ta = (tool[i]-calibs.pedestal(capid)); // pedestal subtraction
      fc_ampl+=ta; 
      ta*= calibs.respcorrgain(capid) ; // fC --> GeV
      ampl+=ta;
      if(ta>maxA){
    maxA=ta;
    maxI=i;
      }
    }
    
    double time=-9999;
    if(maxI==0 || maxI==(tool.size()-1)) {      
      LogDebug("HCAL Pulse") << "ZdcSimpleRecAlgo::reconstruct :" 
                           << " Invalid max amplitude position, " 
                           << " max Amplitude: "<< maxI
                           << " first: "<<ifirst
                           << " last: "<<(tool.size()-1)
                           << std::endl;
    } else {
      maxA=fabs(maxA);
      int capid=digi[maxI-1].capid();
      double t0 = fabs((tool[maxI-1]-calibs.pedestal(capid))*calibs.respcorrgain(capid) );
      capid=digi[maxI+1].capid();
      double t2 = fabs((tool[maxI+1]-calibs.pedestal(capid))*calibs.respcorrgain(capid) );    
      double wpksamp = (t0 + maxA + t2);
      if (wpksamp!=0) wpksamp=(maxA + 2.0*t2) / wpksamp; 
      time = (maxI - digi.presamples())*25.0 + timeshift_ns_zdc(wpksamp);
      if (corr!=0) {
    // Apply phase-based amplitude correction:
    ampl *= corr->getCorrection(fc_ampl);
    //      std::cout << fc_ampl << " --> " << corr->getCorrection(fc_ampl) << std::endl;
      }
    
      if (slewCorrect) time-=HcalTimeSlew::delay(std::max(1.0,fc_ampl),slewFlavor);
    }

    time=time-calibs.timecorr(); // time calibration
    return RecHit(digi.id(),ampl,time);    
  }
}


namespace ZdcSimpleRecAlgoImpl {
  template<class Digi, class RecHit>
  inline RecHit reco2(const Digi& digi, const HcalCoder& coder, const HcalCalibrations& calibs, 
             int ifirst, int n, bool slewCorrect, const HcalPulseContainmentCorrection* corr, HcalTimeSlew::BiasSetting slewFlavor) {
    CaloSamples tool;
    coder.adc2fC(digi,tool);
    double ampl=0; int maxI = -1; double maxA = -1e10; double ta=0;
    double prenoise = 0; double postnoise = 0; 
    int noiseslices = 0;
    double noise = 0;
    double fc_ampl=0;

    for(int k = 0 ; k < tool.size() && k < ifirst; k++){
      prenoise += tool[k];
      noiseslices++;
    }
//    for(int j = (n + ifirst + 1); j <tool.size(); j++){
//      postnoise += tool[j];
//      noiseslices++;
//    }
// removed postnoise due to significant signal seen in TS 7,8,9 (Heavy Ion run 2010)
// Future ZdcSimpleRecAlgo will have better configurable noise calculation
    postnoise=0;    
    if(noiseslices != 0) {
      noise = (prenoise+postnoise)/double(noiseslices);
    } else {
      noise = 0;
    }
 // factor to multiply by noise to make 0 or 1 to handle negative noise situations
    double noisefactor=1.;
    for (int i=ifirst; i<tool.size() && i<n+ifirst; i++) {
      int capid=digi[i].capid();
      if(noise<0){
      // flag hit as having negative noise, and don't subtract anything, because
      // it will falsely increase the energy
         noisefactor=0.;
      } 
      ta = tool[i]-noisefactor*noise;
      fc_ampl+=ta; 
      ta*= calibs.respcorrgain(capid) ; // fC --> GeV
      ampl+=ta;
      if(ta>maxA){
    maxA=ta;
    maxI=i;
      }
    }
//    if(ta<0){
//      // flag hits that have negative energy
//    }

    double time=-9999;
    if(maxI==0 || maxI==(tool.size()-1)) {      
      LogDebug("HCAL Pulse") << "ZdcSimpleRecAlgo::reco2 :" 
                           << " Invalid max amplitude position, " 
                           << " max Amplitude: "<< maxI
                           << " first: "<<ifirst
                           << " last: "<<(tool.size()-1)
                           << std::endl;
    } else {
      int capid=digi[maxI-1].capid();
      double Energy0 = ((tool[maxI-1])*calibs.respcorrgain(capid) );
// if any of the energies used in the weight are negative, make them 0 instead
// these are actually QIE values, not energy
      if(Energy0<0){Energy0=0.;}
      capid=digi[maxI].capid();
      double Energy1 = ((tool[maxI])*calibs.respcorrgain(capid) ) ;
      if(Energy1<0){Energy1=0.;}
      capid=digi[maxI+1].capid();
      double Energy2 = ((tool[maxI+1])*calibs.respcorrgain(capid) );
      if(Energy2<0){Energy2=0.;}
//
      double TSWeightEnergy = ((maxI-1)*Energy0 + maxI*Energy1 + (maxI+1)*Energy2);
      double EnergySum=Energy0+Energy1+Energy2;
      double AvgTSPos=0.;
      if (EnergySum!=0) AvgTSPos=TSWeightEnergy/ EnergySum; 
// If time is zero, set it to the "nonsensical" -99
// Time should be between 75ns and 175ns (Timeslices 3-7)
      if(AvgTSPos==0){
         time=-99;
      } else {
         time = (AvgTSPos*25.0);
      }
      if (corr!=0) {
    // Apply phase-based amplitude correction:
           ampl *= corr->getCorrection(fc_ampl);
      }
    }
    return RecHit(digi.id(),ampl,time);    
  }
}

ZDCRecHit ZdcSimpleRecAlgo::reconstruct(const ZDCDataFrame& digi, const HcalCoder& coder, const HcalCalibrations& calibs) const {
 
  if(recoMethod_ == 1)
   return ZdcSimpleRecAlgoImpl::reco1<ZDCDataFrame,ZDCRecHit>(digi,coder,calibs,
                                  firstSample_,samplesToAdd_,false,
                                  0,
                                  HcalTimeSlew::Fast);
  if(recoMethod_ == 2)
   return ZdcSimpleRecAlgoImpl::reco2<ZDCDataFrame,ZDCRecHit>(digi,coder,calibs,
                                  firstSample_,samplesToAdd_,false,
                                  0,HcalTimeSlew::Fast);

     edm::LogError("ZDCSimpleRecAlgoImpl::reconstruct, recoMethod was not declared");
     throw cms::Exception("ZDCSimpleRecoAlgos::exiting process");
   
}

static const float wpksamp0_zdc = 0.500053;
static const float scale_zdc    = 0.999683;
static const int   num_bins_zdc = 100;

static const float actual_ns_zdc[num_bins_zdc] = {
 0.00250, // 0.000-0.010
 0.08000, // 0.010-0.020
 0.16000, // 0.020-0.030
 0.23750, // 0.030-0.040
 0.31750, // 0.040-0.050
 0.39500, // 0.050-0.060
 0.47500, // 0.060-0.070
 0.55500, // 0.070-0.080
 0.63000, // 0.080-0.090
 0.70000, // 0.090-0.100
 0.77000, // 0.100-0.110
 0.84000, // 0.110-0.120
 0.91000, // 0.120-0.130
 0.98000, // 0.130-0.140
 1.05000, // 0.140-0.150
 1.12000, // 0.150-0.160
 1.19000, // 0.160-0.170
 1.26000, // 0.170-0.180
 1.33000, // 0.180-0.190
 1.40000, // 0.190-0.200
 1.47000, // 0.200-0.210
 1.54000, // 0.210-0.220
 1.61000, // 0.220-0.230
 1.68000, // 0.230-0.240
 1.75000, // 0.240-0.250
 1.82000, // 0.250-0.260
 1.89000, // 0.260-0.270
 1.96000, // 0.270-0.280
 2.03000, // 0.280-0.290
 2.10000, // 0.290-0.300
 2.17000, // 0.300-0.310
 2.24000, // 0.310-0.320
 2.31000, // 0.320-0.330
 2.38000, // 0.330-0.340
 2.45000, // 0.340-0.350
 2.52000, // 0.350-0.360
 2.59000, // 0.360-0.370
 2.68500, // 0.370-0.380
 2.79250, // 0.380-0.390
 2.90250, // 0.390-0.400
 3.01000, // 0.400-0.410
 3.11750, // 0.410-0.420
 3.22500, // 0.420-0.430
 3.33500, // 0.430-0.440
 3.44250, // 0.440-0.450
 3.55000, // 0.450-0.460
 3.73250, // 0.460-0.470
 4.02000, // 0.470-0.480
 4.30750, // 0.480-0.490
 4.59500, // 0.490-0.500
 6.97500, // 0.500-0.510
10.98750, // 0.510-0.520
13.03750, // 0.520-0.530
14.39250, // 0.530-0.540
15.39500, // 0.540-0.550
16.18250, // 0.550-0.560
16.85250, // 0.560-0.570
17.42750, // 0.570-0.580
17.91500, // 0.580-0.590
18.36250, // 0.590-0.600
18.76500, // 0.600-0.610
19.11250, // 0.610-0.620
19.46000, // 0.620-0.630
19.76500, // 0.630-0.640
20.03500, // 0.640-0.650
20.30250, // 0.650-0.660
20.57250, // 0.660-0.670
20.79250, // 0.670-0.680
21.00250, // 0.680-0.690
21.21000, // 0.690-0.700
21.42000, // 0.700-0.710
21.62750, // 0.710-0.720
21.79000, // 0.720-0.730
21.95250, // 0.730-0.740
22.11500, // 0.740-0.750
22.27750, // 0.750-0.760
22.44000, // 0.760-0.770
22.60500, // 0.770-0.780
22.73250, // 0.780-0.790
22.86000, // 0.790-0.800
22.98500, // 0.800-0.810
23.11250, // 0.810-0.820
23.23750, // 0.820-0.830
23.36500, // 0.830-0.840
23.49000, // 0.840-0.850
23.61750, // 0.850-0.860
23.71500, // 0.860-0.870
23.81250, // 0.870-0.880
23.91250, // 0.880-0.890
24.01000, // 0.890-0.900
24.10750, // 0.900-0.910
24.20750, // 0.910-0.920
24.30500, // 0.920-0.930
24.40500, // 0.930-0.940
24.50250, // 0.940-0.950
24.60000, // 0.950-0.960
24.68250, // 0.960-0.970
24.76250, // 0.970-0.980
24.84000, // 0.980-0.990
24.92000  // 0.990-1.000
};

float timeshift_ns_zdc(float wpksamp) {
  float flx = (num_bins_zdc*(wpksamp - wpksamp0_zdc)/scale_zdc);
  int index = (int)flx;
  float yval;
  
  if      (index <    0)        return actual_ns_zdc[0];
  else if (index >= num_bins_zdc-1) return actual_ns_zdc[num_bins_zdc-1];

  // else interpolate:
  float y1       = actual_ns_zdc[index];
  float y2       = actual_ns_zdc[index+1];

  // float delta_x  = 1/(float)num_bins_zdc;
  // yval = y1 + (y2-y1)*(flx-(float)index)/delta_x;

  yval = y1 + (y2-y1)*(flx-(float)index);
  return yval;
}