He3DigitizerModule.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.                  *
 **************************************************************************/
 
#include <beast/he3tube/modules/He3DigitizerModule.h>
#include <beast/he3tube/dataobjects/He3tubeSimHit.h>
 
#include <mdst/dataobjects/MCParticle.h>
#include <framework/datastore/RelationArray.h>
#include <framework/datastore/RelationIndex.h>
#include <framework/logging/Logger.h>
#include <framework/gearbox/GearDir.h>
#include <framework/gearbox/Const.h>
 
//c++
#include <cmath>
#include <string>
#include <stdlib.h>
 
// ROOT
#include <TRandom.h>
 
using namespace std;
using namespace Belle2;
using namespace he3tube;
 
 
//-----------------------------------------------------------------
//                 Register the Module
//-----------------------------------------------------------------
REG_MODULE(He3Digitizer);
 
//-----------------------------------------------------------------
//                 Implementation
//-----------------------------------------------------------------
 
He3DigitizerModule::He3DigitizerModule() : Module()
{
  // Set module properties
  setDescription("He3tube digitizer module");
 
  addParam("conversionFactor", m_ConversionFactor,
           "Conversion factor for pulse heights", 0.303132019);
  addParam("useMCParticles", m_mcpExist, "Use MCParticles to determine if neutrons are present", true);
 
}
 
He3DigitizerModule::~He3DigitizerModule()
{
}
 
void He3DigitizerModule::initialize()
{
  B2INFO("He3Digitizer: Initializing");
  m_he3tubeHit.registerInDataStore();
 
  StoreArray<MCParticle>   mcParticles;
  StoreArray<He3tubeSimHit>  simHits;
  RelationArray relMCSimHit(mcParticles, simHits);
 
  getXMLData();
}
 
void He3DigitizerModule::beginRun()
{
}
 
void He3DigitizerModule::event()
{
  B2DEBUG(250, "Beginning of event method");
 
  StoreArray<He3tubeSimHit> He3SimHits;
  StoreArray<He3tubeHit> He3Hits;
 
  //skip events with no He3SimHits, but continue the event counter
  if (He3SimHits.getEntries() == 0) {
    B2DEBUG(250, "Skipping event #" << Event << " since there are no sim hits");
    Event++;
    return;
  }
 
  auto peak = new double[numOfTubes]();
  auto lowTime = new double[numOfTubes]();  //earliest deposit in each tube
  std::fill_n(lowTime, numOfTubes, 9999999999999);
  auto edepDet = new double[numOfTubes]();  //total energy deposited per tube
  auto NbEle_tot = new double[numOfTubes]();
 
  auto definiteNeutron = new bool[numOfTubes]();
  //vector<int> neutronIDs;
 
  if (m_mcpExist) { //if the mcparticles exist, we know which simhits are from neutron events
 
    StoreArray<MCParticle>   mcParticles;
    RelationIndex<MCParticle, He3tubeSimHit> relMCSimHit(mcParticles, He3SimHits);
 
    int nMCParticles = mcParticles.getEntries();
    for (int i = 0; i < nMCParticles; ++i) {
      MCParticle& mcp = *mcParticles[i];
 
      // Find all He3tubeSimHits which point from that MCParticle.
      typedef RelationIndex<MCParticle, He3tubeSimHit>::Element relMCSimHit_Element;
      for (const relMCSimHit_Element& relation : relMCSimHit.getElementsFrom(mcp)) {
 
        //int processNum = mcp.getSecondaryPhysicsProcess();
 
        MCParticle* mom = mcp.getMother();
 
        if (mom == NULL) continue;
 
        //if(processNum==121){
        if (mom->getPDG() == Const::neutron.getPDGCode()) {
          He3tubeSimHit* aHit = He3SimHits[relation.indexTo];
          int detNB = aHit->getdetNb();
          definiteNeutron[detNB] = true;
          ProcessHit(aHit, lowTime, edepDet, NbEle_tot);
        }
      }
    }
 
 
 
  } else {  //if mcparticles don't exist, we don't know which simhits are from neutron events
    int nentries = He3SimHits.getEntries();
    for (int i = 0; i < nentries; i++) {
      He3tubeSimHit* aHit = He3SimHits[i];
      int pdg = aHit->gettkPDG();
      if (pdg == Const::proton.getPDGCode() || pdg == 1000010030) ProcessHit(aHit, lowTime, edepDet, NbEle_tot);
    }
 
  }
 
 
 
  for (int i = 0; i < numOfTubes; i++) {
    peak[i] = (double)NbEle_tot[i] * m_ConversionFactor; //convert the number of ions into a value in ADC counts
    if (peak[i] != 0) {
 
      //create He3tubeHit
      He3Hits.appendNew(He3tubeHit(edepDet[i], i, peak[i], lowTime[i], definiteNeutron[i]));
 
      B2DEBUG(80, "He3Digitizer: " << edepDet[i] << "MeV deposited in tube #" << i << " with waveform peak of " << peak[i]);
    }
  }
 
  Event++;
 
  //delete arrays
  delete[] peak;
  delete[] lowTime;
  delete[] edepDet;
  delete[] NbEle_tot;
  delete[] definiteNeutron;
 
}
 
 
void He3DigitizerModule::ProcessHit(He3tubeSimHit* aHit, double* lowTime, double* edepDet, double* NbEle_tot)
{
 
  //get various info from this
  double edep = aHit->getEnergyDep();
  double niel = aHit->getEnergyNiel();
  int detNB = aHit->getdetNb();
  double time = aHit->getGlTime();
  if (time < lowTime[detNB]) lowTime[detNB] =
      time; //get the earliest time for this simhit
 
  if (detNB >= numOfTubes) {
    B2WARNING("He3Digitizer: Detector number of He3tubeSimHit is greater than number implemented! Ignoring He3tubeSimHit.");
    return;
  }
 
  //ionization energy
  double ionEn = (edep - niel) * 1e3; //MeV to keV
 
  if ((ionEn * 1e3) < m_Workfct) return;  //keV to eV
  //if there is enough energy to ionize the gas, get the number if ions produced
  if ((ionEn * 1e3) > m_Workfct) {
 
    double meanE1 = ionEn * 1e3 / m_Workfct;
    double sigma = sqrt(m_Fanofac * meanE1);
    const int NbEle = (int)gRandom->Gaus(meanE1,
                                         sigma); //this is the number of electrons created, and the number which reach the wire, since gain is essentially 1.
 
    NbEle_tot[detNB] = NbEle_tot[detNB] + NbEle;
 
  }
 
  edepDet[detNB] = edepDet[detNB] + edep;
 
}
 
 
void He3DigitizerModule::getXMLData()
{
  GearDir content = GearDir("/Detector/DetectorComponent[@name=\"HE3TUBE\"]/Content/");
 
  //get the location of the tubes
  for (const GearDir& activeParams : content.getNodes("Active")) {
    B2DEBUG(250, "Tubes located at x=" << activeParams.getLength("x_he3tube"));
    numOfTubes++;
  }
 
 
  B2INFO("He3Digitizer: There are " << numOfTubes << " tubes implemented");
 
}
 
void He3DigitizerModule::endRun()
{
}
 
void He3DigitizerModule::terminate()
{
}