ECLBackgroundModule.cc

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
//This module
#include <ecl/modules/eclBackgroundStudy/ECLBackgroundModule.h>
 
//Root
#include <TVector3.h>
#include <TH1F.h>
#include <TH2F.h>
 
//Framework
#include <framework/logging/Logger.h>
 
//ECL
#include <ecl/modules/eclBackgroundStudy/ECLCrystalData.h>
#include <ecl/dataobjects/ECLShower.h>
#include <ecl/dataobjects/ECLSimHit.h>
 
#ifdef DOARICH
#include <arich/geometry/ARICHGeometryPar.h>
#endif
 
//Simulation
#include <simulation/dataobjects/BeamBackHit.h>
 
//MDST
#include <mdst/dataobjects/MCParticle.h>
 
#define PI 3.14159265358979323846
 
using namespace std;
using namespace Belle2;
 
//-----------------------------------------------------------------
//                 Register the Module
//-----------------------------------------------------------------
REG_MODULE(ECLBackground)
 
//-----------------------------------------------------------------
//                 Implementation
//-----------------------------------------------------------------
 
 
ECLBackgroundModule::ECLBackgroundModule() : HistoModule()
{
  //Set module properties
  setDescription("Processes background campaigns and produces histograms. Requires HistoManager");
 
  std::vector<int> empty;
  addParam("sampleTime", m_sampleTime,     "Length of sample, in us", 1000);
  addParam("doARICH",    m_doARICH,        "If true, some ARICH plots (for shielding studies) will be produced",  false);
  addParam("crystalsOfInterest", m_CryInt, "Cell ID of crystals of interest. Dose will be printed at end of run", empty);
 
}
 
ECLBackgroundModule::~ECLBackgroundModule()
{
}
 
//If a histogram is initalized here, it will be saved.
void ECLBackgroundModule::defineHisto()
{
  std::ostringstream s;
  s << m_sampleTime;
 
  //initalize histograms
  h_nECLSimHits = new TH1F("ECL_Sim_Hits", "ECL Sim Hits", 100, 0, 100);
 
 
  //Radiation dose
  h_CrystalRadDose = new TH1F("Crystal_Rad_Dose", "Crystal Radiation Dose vs #theta_{ID};#theta_{ID};Gy/yr", 69, -0.5, 68.5);
  h_CrystalRadDoseTheta = new TH1F("Crystal_Rad_Dose_Theta", "Crystal Radiation Dose vs #theta;#theta (deg);Gy/yr", 100,   12, 152);
  h_CrystalThetaID2 = new TH1F("Crystal_Dose_ThetaID_2", "Crystal Radiation Dose vs #phi_{ID}, #theta_{ID}=2; #phi_{ID};Gy/yr", 64,
                               -0.5, 63.5);
  h_CrystalThetaID67 = new TH1F("Crystal_Dose_ThetaID_67", "Crystal Radiation Dose vs #phi_{ID}, #theta_{ID}=67; #phi_{ID};Gy/yr", 64,
                                -0.5, 63.5);
  h_BarrelDose = new TH1F("Crystal_Dose_Barrel", "Crystal Radiation Dose in Barrel, 12<#theta_{ID}<59; #phi_{ID}; Gy/yr", 144, -0.5,
                          143.5);
  h_DiodeRadDose = new TH1F("Diode_Rad_Dose", "Diode Radiation Dose vs #theta_{ID};#theta_{ID};Gy/yr", 69, -0.5, 68.5);
 
  //hit locations
  h_ProdVert = new TH1F("MCProd_Vert", "Production Vertex;z (cm)", 125, -200, 300);
  h_HitLocations = new TH2F("Hit_Locations", "Hit locations;z (cm); r (cm)", 250, -200, 300, 80,    0, 160);
  h_ProdVertvsThetaId = new TH2F("MCProd_Vert_vs_ThetaID", "Production Vertex vs #theta_{ID};#theta_{ID};z (cm)", 69, -0.5, 68.5, 125,
                                 -200, 300);
  hEdepPerRing = new TH1F("hEdepPerRing", "Energy deposited per #theta_{ID};#theta_{ID}; GeV", 69, -0.5, 68.5);
  hNevtPerRing = new TH1F("hNevtPerRing", "Number of events #theta_{ID} (for pile-up);#theta_{ID};N_{event}", 69, -0.5, 68.5);
 
 
 
  //Neutrons
  h_NeutronFluxThetaID2 = new TH1F("Neutron_Flux_ThetaID_2", "Diode Neutron Flux, #theta_{ID}=2;#phi_{ID}; yr^{-1}/cm^{-2}", 64, -0.5,
                                   63.5);
  h_NeutronFluxThetaID67 = new TH1F("Neutron_Flux_ThetaID_67", "Diode Neutron Flux, #theta_{ID}=67;#phi_{ID}; yr^{-1}/cm^{-2}", 64,
                                    -0.5, 63.5);
  h_NeutronFlux = new TH1F("Neutron_Flux", "Diode Neutron Flux vs #theta_{ID};#theta_{ID}; yr^{-1}/cm^{-2}", 69, -0.5, 68.5);
  h_NeutronE = new TH1F("Neutron_Energy", "Neutron Energy; Energy (MeV)", 200, 0, 0.5);
  h_NeutronEThetaID0 = new TH1F("Neutron_Energy_ThetaID0", "Neutron Energy, First Crystal; Energy (MeV)", 50, 0, 0.5);
 
  h_PhotonE = new TH1F("Photon_Energy", "Energy of photons creating hits in ECL; Energy (MeV)",   200, 0, 10);
 
  //showers
  TString stime = s.str();
  h_Shower = new TH1F("Shower_E_Dist", "Shower Energy distribution " + stime + " #mu s;GeV;# of showers", 100, 0, 0.5);
  h_ShowerVsTheta = new TH2F("Shower_E_Dist_vs_theta", "Shower Energy distribution " + stime + " #mu s;GeV;#theta (deg)", 100, 0, 0.5,
                             180, 0, 180);
 
 
 
  //
  // Below are for the ECL shields studies
  //
 
  //Doses
  hEMDose = new TH1F("hEMDose",  "Crystal Radiation Dose; Cell ID ; Gy/yr", 8736, 0, 8736);
  hEnergyPerCrystal = new TH1F("hEnergyPerCrystal", "Energy per crystal; Cell ID; GeV", 8736, 0, 8736);
 
  //Diodes
  hDiodeFlux  = new TH1F("hDiodeFlux",  "Diode Neutron Flux ; Cell ID ; 1MeV-equiv / cm^{2} yr", 8736, 0, 8736);
 
  //Radiation spectra
  hEgamma = new TH1F("hEgamma", "Log Spectrum of the photons hitting the crystals / 1 MeV; log_{10}(E_{#gamma}/1MeV) ", 500, -4, 3);
  hEneu   = new TH1F("hEneu",   "Log Spectrum of the neutrons hitting the diodes / 1 MeV; log_{10}(E_{n}/1MeV)",        500, -10, 2);
 
  //ARICH plots
  if (m_doARICH) {
    hARICHDoseBB = new TH1F("hARICHDoseBB", "Radiation dose in ARICH boards (cBB); Ring-ID; Gy/yr", 7, -0.5, 6.5);
    hHAPDFlux    = new TH1F("hARICHnFlux",  "1-MeV equivalent neutron flux in ARICH diodes (BB) ; Ring-ID ; 1-MeV-equiv / cm^{2} yr", 7,
                            -0.5, 6.5);
  }
 
  hEMDoseECF     = new TH2F();
  hEMDoseECB     = new TH2F();
  hEMDoseBAR     = new TH2F();
  hEMDoseWideTID = new TH1F();
 
  hDiodeFluxECF     = new TH2F();
  hDiodeFluxECB     = new TH2F();
  hDiodeFluxBAR     = new TH2F();
  hDiodeFluxWideTID = new TH1F();
 
  hEnergyPerCrystalECF     = new TH2F();
  hEnergyPerCrystalECB     = new TH2F();
  hEnergyPerCrystalBAR     = new TH2F();
  hEnergyPerCrystalWideTID = new TH1F();
 
 
 
}
 
void ECLBackgroundModule::initialize()
{
 
  REG_HISTOGRAM
 
  if (m_doARICH)  {
    B2INFO("ECLBackgroundModule: ARICH plots are being produced");
    // Initialize variables
#ifdef DOARICH
    m_arichgp = ARICHGeometryPar::Instance();
#endif
  }
 
  m_nEvent = 0;
  BuildECL();
 
}
 
void ECLBackgroundModule::beginRun()
{
}
 
void ECLBackgroundModule::event()
{
 
 
 
  //some variables that will be used many times
  int m_cellID, m_thetaID, m_phiID, pid, NperRing;
  double edep, theta, Energy, diodeDose, weightedFlux;
 
  //ignore events with huge number of SimHits (usually a glitchy event)
  if (m_eclArray.getEntries() > 4000) {
    B2INFO("ECLBackgroundModule: Skipping event #" << m_nEvent << " due to large number of ECLSimHits");
    m_nEvent++;
    return;
  }
 
  bool isE = false;
  //bool EinTheta[nECLThetaID] = {false};
 
  double edepSum = 0;
  //double edepSumTheta[nECLThetaID] = {0};
  //double E_tot[nECLCrystalTot] = {0};
 
 
  auto edepSumTheta = new double[nECLThetaID]();
  auto E_tot = new double[nECLCrystalTot]();
 
  auto EinTheta = new bool[nECLThetaID]();
  std::fill_n(EinTheta, nECLThetaID, false);
 
 
  h_nECLSimHits->Fill(m_eclArray.getEntries()); //number of ECL hits in an event
 
  //MC ID of photon hits
  vector<int> MCPhotonIDs;
 
  int hitNum = m_eclArray.getEntries();
  for (int i = 0; i < hitNum; i++) { //loop over ECLSimHits
    ECLSimHit* aECLHit = m_eclArray[i];
    m_cellID    = aECLHit->getCellId() - 1; //cell ID
    edep        = aECLHit->getEnergyDep();  //energy deposited
    G4ThreeVector hitPosn   = aECLHit->getPosition();   //position of hit
    pid         = aECLHit->getPDGCode();
    float Mass  = Crystal[m_cellID]->GetMass();
    m_thetaID   = Crystal[m_cellID]->GetThetaID();
    m_phiID     = Crystal[m_cellID]->GetPhiID();
    NperRing    = Crystal[m_cellID]->GetNperThetaID();   //number of crystals in this theta ring
    theta       = Crystal[m_cellID]->GetTheta();
 
 
    //get Track ID of photons which create the SimHits
    if (pid == 22) MCPhotonIDs.push_back(aECLHit->getTrackId());
 
    edepSum = edepSum + edep;
    E_tot[m_cellID] = edep + E_tot[m_cellID]; //sum energy deposited in this crystal
    edepSumTheta[m_thetaID] = edepSumTheta[m_thetaID] + edep;   //sum of energy for this thetaID value
    EinTheta[m_thetaID] = true;                                 //there is an energy deposit in this theta ring. used later
    isE = true;
 
 
    //fill histograms
    //radiation dose for this SimHit
    double dose = edep * GeVtoJ * usInYr / (m_sampleTime * Mass);
 
    h_CrystalRadDoseTheta->Fill(theta, dose / NperRing);
    h_CrystalRadDose->AddBinContent(m_thetaID + 1,  dose / NperRing);
    hEMDose->AddBinContent(m_cellID + 1, dose);
    hEnergyPerCrystal->AddBinContent(m_cellID + 1, edep);
 
    //2nd thetaID ring
    if (m_thetaID == 2) {
      h_CrystalThetaID2->AddBinContent(m_phiID + 1,  dose);
    }
    //67th thetaID ring
    if (m_thetaID == 67) {
      h_CrystalThetaID67->AddBinContent(m_phiID + 1, dose);
    }
    //Barrel
    if (m_thetaID < 59 && m_thetaID > 12) {
      h_BarrelDose->AddBinContent(m_phiID + 1, dose / 46);
    }
 
    //location of the hit
    h_HitLocations->Fill(hitPosn.z(), hitPosn.perp());
 
  }
 
 
  //for pileup noise estimation. To properly produce pileup noise plot, see comment at EOF.
  for (int iECLCell = 0; iECLCell < nECLCrystalTot; iECLCell++) {
    edep      = E_tot[iECLCell];
    m_thetaID = Crystal[iECLCell]->GetThetaID();
    NperRing  = Crystal[iECLCell]->GetNperThetaID();
    if (edep > 0.000000000001) {
      hNevtPerRing->Fill(m_thetaID, 1.0 / NperRing);
      hEdepPerRing->Fill(m_thetaID, edep / NperRing);
    }
 
  }
 
 
  //One track can create several ECLSimHits. Remove the duplicates
  sort(MCPhotonIDs.begin(), MCPhotonIDs.end());
  vector<int>::iterator it;
  it = std::unique(MCPhotonIDs.begin(), MCPhotonIDs.end());
  MCPhotonIDs.resize(std::distance(MCPhotonIDs.begin() , it));
 
 
  //loop over MCParticles to find the photons that caused the simhits
  for (int i = 0; i < (int)MCPhotonIDs.size(); i++) {
    for (int j = 0; j < m_mcParticles.getEntries(); j++) {
      if (m_mcParticles[j]->getIndex() == MCPhotonIDs[i]) {
        h_PhotonE->Fill(m_mcParticles[j]->getEnergy() * 1000);
        hEgamma->Fill(log10(m_mcParticles[j]->getEnergy() * 1000));
        break;         //once the correct MCParticle is found, stop looping over MCParticles
      }
    }
  }
 
  //*****************end of crystal analysis
 
  //start of diode analysis
  int neuHits = m_BeamBackArray.getEntries();
  for (int iHits = 0; iHits < neuHits; iHits++) { //loop over m_BeamBackArray
    BeamBackHit* aBeamBackSimHit = m_BeamBackArray[iHits];
 
    //get relevant values
    m_cellID = aBeamBackSimHit->getIdentifier();
    double damage = aBeamBackSimHit->getNeutronWeight();
    edep          = aBeamBackSimHit->getEnergyDeposit();
    pid           = aBeamBackSimHit->getPDG();
    int SubDet    = aBeamBackSimHit->getSubDet();
    Energy = aBeamBackSimHit->getEnergy();
    //TVector3 rHit          = aBeamBackSimHit->getPosition(); //currently not used
 
 
    if (SubDet == 6) { //ECL
 
      m_thetaID = Crystal[m_cellID]->GetThetaID();
      m_phiID   = Crystal[m_cellID]->GetPhiID();
      NperRing  = Crystal[m_cellID]->GetNperThetaID();
      diodeDose = edep * GeVtoJ * usInYr / (m_sampleTime * DiodeMass);
      h_DiodeRadDose->AddBinContent(m_thetaID + 1, diodeDose / NperRing); //diode radiation dose plot
 
      if (pid == 2112) {
 
        weightedFlux = damage * usInYr / (m_sampleTime * DiodeArea) ;           //neutrons per cm^2 per year
 
        //neutron plots
        if (m_thetaID == 0) h_NeutronEThetaID0->Fill(Energy * 1000);
        h_NeutronE->Fill(Energy * 1000);
        hEneu->Fill(log10(Energy * 1000));
 
        h_NeutronFlux->AddBinContent(m_thetaID + 1, weightedFlux / NperRing);
        hDiodeFlux->AddBinContent(m_cellID + 1,  weightedFlux);
 
        if (m_thetaID == 2)  h_NeutronFluxThetaID2->AddBinContent(m_phiID + 1 , weightedFlux);
        if (m_thetaID == 67) h_NeutronFluxThetaID67->AddBinContent(m_phiID + 1 , weightedFlux);
 
 
      }
 
    } else if (SubDet == 4 && m_doARICH) { //ARICH
      FillARICHBeamBack(aBeamBackSimHit);
    }
  }
 
  int nShower = m_eclShowerArray.getEntries();
  for (int i = 0; i < nShower; i++) {
    ECLShower* aShower = m_eclShowerArray[i];
 
    Energy = aShower->getEnergy();
    theta = aShower->getTheta();
 
    //get number of background showers with energy above 20MeV
    if (Energy > 0.02) {
      h_Shower->Fill(Energy);
      h_ShowerVsTheta->Fill(Energy, theta * 180 / PI);
 
    }
  }
 
 
  for (int i = 0; i < nECLThetaID; i++) {
    if (EinTheta[i]) {
      //0th McParticle in an event is the origin of all particles
      h_ProdVertvsThetaId->Fill(i, m_mcParticles[0]->getProductionVertex().z(), edepSumTheta[i]);
    }
  }
 
 
  if (isE) {
    h_ProdVert->Fill(m_mcParticles[0]->getProductionVertex().z(), edepSum);
  }
 
  if (m_nEvent % ((int)m_sampleTime * 100) == 0) B2INFO("ECLBackgroundModule: At Event #" << m_nEvent);
  m_nEvent++;
 
  delete[] edepSumTheta;
  delete[] E_tot;
  delete[] EinTheta;
 
}
 
void ECLBackgroundModule::endRun()
{
  B2INFO("ECLBackgroundModule: Total Number of events: "  << m_nEvent);
 
  //print doses of crystals of interest
  for (int i = 0; i < (int)m_CryInt.size(); i++) {
    if (m_CryInt[i] > 8736) {
      B2WARNING("ECLBackgroundModule: Invalid cell ID. must be less than 8736");
      continue;
    }
    double dose = hEMDose->GetBinContent(m_CryInt[i] + 1); //add 1 since bin #1 corrosponds to cell ID #0
    int thetaID = Crystal[m_CryInt[i]]->GetThetaID();
    int phiID   = Crystal[m_CryInt[i]]->GetPhiID();
    B2RESULT("Dose in Crystal " << m_CryInt[i] << ": " << dose << " ThetaID=" << thetaID << ", PhiID=" << phiID);
  }
 
 
  hEnergyPerCrystalECF = BuildPosHisto(hEnergyPerCrystal, "forward");
  hEnergyPerCrystalECB = BuildPosHisto(hEnergyPerCrystal, "backward");
  hEnergyPerCrystalBAR = BuildPosHisto(hEnergyPerCrystal, "barrel");
  hEnergyPerCrystalWideTID = BuildThetaIDWideHisto(hEnergyPerCrystal);
 
 
  hEMDoseECF = BuildPosHisto(hEMDose, "forward");
  hEMDoseECB = BuildPosHisto(hEMDose, "backward");
  hEMDoseBAR = BuildPosHisto(hEMDose, "barrel");
  hEMDoseWideTID = BuildThetaIDWideHisto(hEMDose);
 
  hDiodeFluxECF  = BuildPosHisto(hDiodeFlux, "forward");
  hDiodeFluxECB  = BuildPosHisto(hDiodeFlux, "backward");
  hDiodeFluxBAR  = BuildPosHisto(hDiodeFlux, "barrel");
  hDiodeFluxWideTID = BuildThetaIDWideHisto(hDiodeFlux);
 
  hEMDose->SetTitle("Crystal Radiation Dose vs Cell ID");
  hDiodeFlux->SetTitle("Diode Neutron Flux vs Cell ID");
 
}
 
void ECLBackgroundModule::terminate()
{
}
 
 
//
// Methods to study performance of ECL shields
//   and potential impact on ARICH doses
#ifdef DOARICH
int ECLBackgroundModule::FillARICHBeamBack(BeamBackHit* aBBHit)
{
 
  double _damage   = aBBHit->getNeutronWeight();
  double _eDep     = aBBHit->getEnergyDeposit();
  float _trlen     = aBBHit->getTrackLength();
  int _pid         = aBBHit->getPDG();
  TVector3 _posHit = aBBHit->getPosition();
 
  int _moduleID    = m_arichgp->getCopyNo(_posHit);
 
  double r = _posHit.Perp();
  int _ring = 0;
 
  _ring = ARICHmod2row(_moduleID);
 
  B2DEBUG(200, "Filling ARICH BeamBackHit");
  B2DEBUG(200, " PDG = " << _pid);
  B2DEBUG(200, " Edep = " << _eDep);
  B2DEBUG(200, " Ring = " << _ring);
  B2DEBUG(200, " Radius = " << r);
  B2DEBUG(200, " Module = " << _moduleID);
 
  if (2112 == _pid) {
    hHAPDFlux->Fill(_ring, _damage * _trlen / HAPDthickness  * usInYr / (m_sampleTime * HAPDarea * nHAPDperRing[_ring]));
  } else {
    hARICHDoseBB->Fill(_ring, _eDep / (HAPDmass * nHAPDperRing[_ring]) * GeVtoJ * usInYr / m_sampleTime);
  }
 
  return 1;
}
 
#else
int ECLBackgroundModule::FillARICHBeamBack(BeamBackHit* aBBHit) { return 1;}
#endif
 
int ECLBackgroundModule::BuildECL()
{
  for (int i = 0; i < nECLCrystalTot; i++) {
    Crystal[i] = new ECLCrystalData(i);
  }
  return 1;
}
 
//Method used for debugging.
int ECLBackgroundModule::SetPosHistos(TH1F* h, TH2F* hFWD, TH2F* hBAR, TH2F* hBWD)
{
  // Currently not used
  //std::string FWDtitle = h->GetTitle() + std::string(" -- Forward Endcap");
  //std::string BWDtitle = h->GetTitle() + std::string(" -- Backward Endcap");
  //std::string BARtitle = h->GetTitle() + std::string(" -- Barrel");
  //std::string FWDname = h->GetTitle() + std::string("FWD");
  //std::string BWDname = h->GetTitle() + std::string("BWD");
  //std::string BARname = h->GetTitle() + std::string("BAR");
 
  // Fill 2D histograms with the values in the 1D histogram
  for (int i = 0; i < nECLCrystalTot; i++)  {
    float value = h->GetBinContent(i + 1);
 
    if (i < nECLCrystalECF) {
      hFWD->Fill(floor(Crystal[i]->GetX()), floor(Crystal[i]->GetY()), value);
 
    } else if (i >= (nECLCrystalBAR + nECLCrystalECF)) {
      hBWD->Fill(floor(Crystal[i]->GetX()), floor(Crystal[i]->GetY()), value);
 
    } else
      hBAR->Fill(floor(Crystal[i]->GetZ()), floor(Crystal[i]->GetR() * (Crystal[i]->GetPhi() - 180) * PI / 180)    , value);
  }
 
  return 1;
}
 
 
TH2F* ECLBackgroundModule::BuildPosHisto(TH1F* h, const char* sub)
{
 
  // Initialize variables
  TH2F* h_out = nullptr;
 
  // Forward endcap value vs (x,y)
  if (!strcmp(sub, "forward")) {
    std::string _name = h->GetName() + std::string("FWD");
    std::string _title = h->GetTitle() + std::string(" -- Forward Endcap;x(cm);y(cm)");
    h_out = new TH2F(_name.c_str(), _title.c_str(), 90, -150, 150, 90, -150, 150); //position in cm
    h_out->Sumw2();
    for (int i = 0; i < nECLCrystalECF; i++)  {
      double value = h->GetBinContent(i + 1);
      h_out->Fill(floor(Crystal[i]->GetX()),
                  floor(Crystal[i]->GetY()),
                  value);
    }
 
    // Backward endcap value vs (x,y)
  } else if (!strcmp(sub, "backward")) {
    std::string _name = h->GetName() + std::string("BWD");
    std::string _title = h->GetTitle() + std::string(" -- Backward Endcap;x(cm);y(cm)");
    h_out = new TH2F(_name.c_str(), _title.c_str(), 90, -150, 150, 90, -150, 150); //position in cm
    h_out->Sumw2();
    for (int i = (nECLCrystalBAR + nECLCrystalECF); i < nECLCrystalTot; i++) {
      double value = h->GetBinContent(i + 1);
      h_out->Fill(floor(Crystal[i]->GetX()),
                  floor(Crystal[i]->GetY()),
                  value);
    }
 
 
    // The rest: barrel value vs (theta_ID, phi_ID)
  } else if (!strcmp(sub, "barrel")) {
    std::string _name = h->GetName() + std::string("BAR");
    std::string _title = h->GetTitle() + std::string(" -- Barrel;#theta_{ID};#phi_{ID}");
    h_out = new TH2F(_name.c_str(), _title.c_str(), 47, 12, 59, 144, 0, 144); //position in cm (along z and along r*phi)
    h_out->Sumw2();
    for (int i = nECLCrystalECF; i < (nECLCrystalBAR + nECLCrystalECF); i++) {
      double value = h->GetBinContent(i + 1);
      h_out->Fill(Crystal[i]->GetThetaID(),  Crystal[i]->GetPhiID(), value);
    }
 
  } else {
    B2WARNING("ECLBackgroundModule: Unable to BuildPosHisto. Check Arguments.");
    h_out =  new TH2F("(empty)", "(empty)", 1, 0, 1, 1, 0, 1);
  }
 
  return h_out;
}
 
 
TH1F*   ECLBackgroundModule::BuildThetaIDWideHisto(TH1F* h_cry)
{
 
  //Define the boundaries of the bins
  static const int    _nbins = 21;
  static const double _xbins[] = { -0.5,  0.5,  4.5,  8.5, 11.5, 12.5,
                                   16.5, 20.5, 24.5, 28.5, 32.5,
                                   36.5, 40.5, 44.5, 48.5, 52.5,
                                   56.5, 58.5, 59.5, 63.5, 67.5, 68.5
                                 };
 
 
  std::string _title = h_cry->GetTitle() + std::string(" vs #theta_{ID} -- averages");
  std::string _name = h_cry->GetName() + std::string("vsTheWide");
 
  //New pointer to the returned histogram ...
  TH1F* h_out  = new TH1F(_name.c_str(), _title.c_str(), 1, 0, 1);
  // ... but only temp variables to the temporary ones
  TH1F h_mass("h_mass", "Total Mass per Theta-ID", 1, 0, 1);
  TH1F h_N("h_N", "Entries (unweighted) per Theta-ID bin", 1, 0, 1);
 
  //Apply all the same binning
  h_out->SetBins(_nbins, _xbins);
  h_mass.SetBins(_nbins, _xbins);
  h_N.SetBins(_nbins, _xbins);
 
  h_out->SetTitle(_title.c_str());
  h_out->Sumw2();
 
  //Make histo for total mass, then divide!
  for (int i = 0; i < nECLCrystalTot; i++)  {
    h_out->Fill(Crystal[i]->GetThetaID(), h_cry->GetBinContent(i + 1) * Crystal[i]->GetMass());
    h_mass.Fill(Crystal[i]->GetThetaID(), Crystal[i]->GetMass());
    h_mass.SetBinError(Crystal[i]->GetThetaID(), 0);
    h_N.Fill(Crystal[i]->GetThetaID());
  }
  h_out->SetXTitle("#theta_{ID}");
  h_out->SetYTitle(h_cry->GetYaxis()->GetTitle());
  h_out->Divide(&h_mass);
 
  return h_out;
}
 
 
int ECLBackgroundModule::ARICHmod2row(int modID)
{
  if (modID <= 42) return 0;
  else if (modID <= 90) return 1;
  else if (modID <= 144) return 2;
  else if (modID <= 204) return 3;
  else if (modID <= 270) return 4;
  else if (modID <= 342) return 5;
  else if (modID <= 420) return 6;
 
  B2WARNING("ECLBackgroundModule: ARICHmod2row: modID out of bound; can't get ring index");
  return -1;
}
 
 
 
 
/*
// In order to produce the pileup noise estimate, use this function (paste into another file):
void PileUpNoise(){
 
  const int numOfTypes = 8;
  TString Filetypes[] =  {"Touschek_HER", "Touschek_LER", "Coulomb_HER", "Coulomb_LER", "RBB_HER", "RBB_LER", "BHWide_HER", "BHWide_LER"};
  TFile *f;
 
  double hEdepPerRing[69] = {};
  double hNevtPerRing[69] = {};
  double sampletime=1000;
 
  TH1F *h_Pileup = new TH1F("Pile_up", "Estimated Pile up Noise vs #theta_{ID}; #theta_{ID}; MeV", 69, -0.5, 68.5);
 
  for(int i=0; i<numOfTypes; i++){
    f = new TFile(Filetypes[i]+".root");                      //loads the sample files (eg, Touschek_HER.root, RBB_LER.root, etc)
    TH1F *hNevt = (TH1F*)gROOT->FindObject("hNevtPerRing");
    TH1F *hEdep = (TH1F*)gROOT->FindObject("hEdepPerRing");
    for(int j=1; j<70; j++){
      hEdepPerRing[j-1] = hEdepPerRing[j-1] + hEdep->GetBinContent(j);
      hNevtPerRing[j-1] = hNevtPerRing[j-1] + hNevt->GetBinContent(j);
    }
  }
 
  for(int i=1; i<70; i++){
      double Eavg = hEdepPerRing[i-1] / hNevtPerRing[i-1];
      double pileup = sqrt( hNevtPerRing[i-1] / sampletime ) * Eavg * 1000;
      h_Pileup->SetBinContent(i, pileup);
  }
 
}
*/