HGCalSciNoiseMap.cc

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#include "SimCalorimetry/HGCalSimAlgos/interface/HGCalSciNoiseMap.h"
#include "FWCore/ParameterSet/interface/FileInPath.h"
#include <fstream>
 
//
HGCalSciNoiseMap::HGCalSciNoiseMap() : refEdge_(3.) {}
 
//
void HGCalSciNoiseMap::setSipmMap(const std::string& fullpath) { sipmMap_ = readSipmPars(fullpath); }
 
//
std::unordered_map<int, float> HGCalSciNoiseMap::readSipmPars(const std::string& fullpath) {
  std::unordered_map<int, float> result;
  //no file means default sipm size
  if (fullpath.empty())
    return result;
 
  edm::FileInPath fp(fullpath);
  std::ifstream infile(fp.fullPath());
  if (!infile.is_open()) {
    throw cms::Exception("FileNotFound") << "Unable to open '" << fullpath << "'" << std::endl;
  }
  std::string line;
  while (getline(infile, line)) {
    int layer;
    float boundary;
 
    //space-separated
    std::stringstream linestream(line);
    linestream >> layer >> boundary;
 
    result[layer] = boundary;
  }
  return result;
}
 
//
std::pair<double, double> HGCalSciNoiseMap::scaleByDose(const HGCScintillatorDetId& cellId, const double radius) {
  if (getDoseMap().empty())
    return std::make_pair(1., 0.);
 
  //formula is: A = A0 * exp( -D^0.65 / 199.6)
  //where A0 is the response of the undamaged detector, D is the dose
  int layer = cellId.layer();
  double cellDose = getDoseValue(DetId::HGCalHSc, layer, radius);  //in kRad
  constexpr double expofactor = 1. / 199.6;
  const double dosespower = 0.65;
  double scaleFactor = std::exp(-std::pow(cellDose, dosespower) * expofactor);
 
  //formula is: N = 2.18 * sqrt(F * A / 2e13)
  //where F is the fluence and A is the SiPM area
  double cellFluence = getFluenceValue(DetId::HGCalHSc, layer, radius);  //in 1-Mev-equivalent neutrons per cm2
 
  constexpr double fluencefactor = 2. / (2 * 1e13);  //SiPM area = 2mm^2
  const double normfactor = 2.18;
  double noise = normfactor * sqrt(cellFluence * fluencefactor);
 
  return std::make_pair(scaleFactor, noise);
}
 
double HGCalSciNoiseMap::scaleByTileArea(const HGCScintillatorDetId& cellId, const double radius) {
  double edge;
  if (cellId.type() == 0) {
    constexpr double factor = 2 * M_PI * 1. / 360.;
    edge = radius * factor;  //1 degree
  } else {
    constexpr double factor = 2 * M_PI * 1. / 288.;
    edge = radius * factor;  //1.25 degrees
  }
 
  double scaleFactor = refEdge_ / edge;  //assume reference 3cm of edge
 
  return scaleFactor;
}
 
double HGCalSciNoiseMap::scaleBySipmArea(const HGCScintillatorDetId& cellId, const double radius) {
  if (sipmMap_.empty())
    return 1.;
 
  int layer = cellId.layer();
  if (radius < sipmMap_[layer])
    return 2.;
  else
    return 1.;
}