EMECDetDescr.cxx

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/*
  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
*/
 
#include "LArReadoutGeometry/EMECDetectorManager.h"
#include "LArReadoutGeometry/EMECDetDescr.h"
 
 
namespace {
 

 
struct Boundary {
  double min;
  double max;
  unsigned int nDiv;
};
const Boundary
etaBoundariesEndcap[4][2][6] = {{{{1.500, 1.800, 12},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0}},    // presampler outer
                   {{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0}}},   // presampler inner
                  {{{1.375, 1.425,  1},{1.425, 1.500,  3},{1.500, 1.800, 96},{1.800, 2.000, 48},{2.000, 2.400, 64},{2.400, 2.500,  4}},    // sample 1 outer 
                   {{2.500, 3.200,  7},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0}}},   // sample 1 inner
                  {{{1.375, 1.425,  1},{1.425, 2.5,   43},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0}},    // sample 2 outer
                   {{2.500, 3.200,  7},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0}}},   // sample 2 inner
                  {{{1.500, 2.500, 20},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0}},    // sample 3 outer
                   {{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0},{0.000, 0.000,  0}}}};  // sample 3 inner
 
 
} // anonymous namespace
 
 
EMECDetDescr::EMECDetDescr (const EMECDetectorManager *detManager
                , unsigned int sampling
                , unsigned int region
                , unsigned int radialPart
                , const CellBinning &phiBinning)
  : m_manager(detManager)
  , m_samplingIndex(sampling)
  , m_regionIndex(region)
  , m_radialIndex(radialPart) 
  , m_phiBinning(phiBinning)
  , m_etaBinning(etaBoundariesEndcap[sampling][radialPart][region].min
         ,etaBoundariesEndcap[sampling][radialPart][region].max
         ,etaBoundariesEndcap[sampling][radialPart][region].nDiv)
{
  // This contains some logic for decoding the sampling separation arrays:
  if (sampling==0) {
    m_halfLength.push_back(m_manager->getPresamplerFullLength()/2.0); 
    m_offset.push_back    (0);
    return;
  }
 
  double eta0, dEta;
  if (m_radialIndex ==0 ) {     // Outer Wheel.
    eta0=1.4;
    dEta=0.025;
  }
  else if (m_radialIndex==1) {  // Inner Wheel
    eta0=2.5;
    dEta=0.1;
  }
  else {
    throw std::range_error("Attempt to construct EMEC DetDescr with illegal index combinations");
  }
 
  const double inv_dEta = 1. / dEta;
 
  for (unsigned int i=0;i<m_etaBinning.getNumDivisions();i++) {
    double eta = m_etaBinning.binCenter(i);
    int ipad = int((eta - eta0) * inv_dEta);
    double front,back;
    if (m_radialIndex ==0 ) {     // Outer Wheel.
      if (sampling==1) {
    front=0;
    back = m_manager->getZSEP12(ipad)-m_manager->getFocalToRef()-m_manager->getRefToActive();
      }
      else if (sampling==2) {
 
    //  std::min is used to max out the length to the total active length; this is for
    //  cells that spill out the side.  They will have funny volumes. 
 
    front = m_manager->getZSEP12(ipad)-m_manager->getFocalToRef()-m_manager->getRefToActive();
    back  = std::min(m_manager->getActiveLength(),m_manager->getZSEP23(ipad/2)-m_manager->getFocalToRef()-m_manager->getRefToActive());
      }      
      else if (sampling==3) {
    front  = m_manager->getZSEP23(ipad/2)-m_manager->getFocalToRef()-m_manager->getRefToActive();
    back   = m_manager->getActiveLength();
      } 
      else {
    throw std::range_error("Attempt to construct EMEC DetDescr with illegal index combinations");
      }
     
    }
    else if (m_radialIndex==1) {  // Inner Wheel
      if (sampling==1) {
    front=0;
    back = m_manager->getZIW(ipad) - m_manager->getFocalToRef() - m_manager->getRefToActive();
      }
      else if (sampling==2) {
    front = m_manager->getZIW(ipad) - m_manager->getFocalToRef() - m_manager->getRefToActive();
    back     = m_manager->getActiveLength();
      }
      else {
    throw std::range_error("Attempt to construct EMEC DetDescr with illegal index combinations");
      }
    }
    else {
      throw std::range_error("Attempt to construct EMEC DetDescr with illegal index combinations");
    }
    m_offset.push_back((front+back)/2.);
    m_halfLength.push_back((back-front)/2.);
  }
}
 
 
EMECDetDescr::~EMECDetDescr()
= default;