/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/Geometry/ForwardGeometry/src/ZdcHardcodeGeometryLoader.cc

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#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/ForwardGeometry/interface/ZdcHardcodeGeometryLoader.h"
#include "Geometry/ForwardGeometry/interface/IdealZDCTrapezoid.h"
#include "Geometry/ForwardGeometry/interface/ZdcGeometry.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <algorithm>

ZdcHardcodeGeometryLoader::ZdcHardcodeGeometryLoader() :
   theTopology ( new ZdcTopology ) ,
   extTopology ( theTopology )
{
  init();
}

ZdcHardcodeGeometryLoader::ZdcHardcodeGeometryLoader(const ZdcTopology& ht) : 
   theTopology( 0   ) ,
   extTopology( &ht ) 
{
  init();
}

void ZdcHardcodeGeometryLoader::init() 
{
}

ZdcHardcodeGeometryLoader::ReturnType 
ZdcHardcodeGeometryLoader::load(DetId::Detector det, int subdet)
{
   ReturnType hg(new ZdcGeometry( extTopology ) );
   if(subdet == HcalZDCDetId::SubdetectorId)
   {
      fill(HcalZDCDetId::EM  ,hg );
      fill(HcalZDCDetId::LUM ,hg );
      fill(HcalZDCDetId::HAD ,hg );
   }
   return hg;
}

ZdcHardcodeGeometryLoader::ReturnType 
ZdcHardcodeGeometryLoader::load() 
{
   ReturnType hg(new ZdcGeometry( extTopology ) );
   fill(HcalZDCDetId::EM  ,hg );
   fill(HcalZDCDetId::LUM ,hg );
   fill(HcalZDCDetId::HAD ,hg );
   return hg;
}

void ZdcHardcodeGeometryLoader::fill( HcalZDCDetId::Section section, 
                                      ReturnType            geom     ) 
{
  // start by making the new HcalDetIds
  std::vector<HcalZDCDetId> zdcIds;
  HcalZDCDetId id;
  int firstCell = extTopology->firstCell(section);
  int lastCell = extTopology->lastCell(section);
  for(int ichannel = firstCell; ichannel <= lastCell; ++ichannel) {
    id = HcalZDCDetId(section, true, ichannel);
    if(extTopology->valid(id)) zdcIds.push_back(id);
    id = HcalZDCDetId(section, false, ichannel);
    if(extTopology->valid(id)) zdcIds.push_back(id);
   }
  if( geom->cornersMgr() == 0 ) geom->allocateCorners( HcalZDCDetId::kSizeForDenseIndexing ) ;
  if( geom->parMgr()     == 0 ) geom->allocatePar( 
     ZdcGeometry::k_NumberOfParametersPerShape*ZdcGeometry::k_NumberOfShapes,
     ZdcGeometry::k_NumberOfParametersPerShape ) ;

  edm::LogInfo("ZdcHardcodeGeometry") << "Number of ZDC DetIds made: " << section << " " << zdcIds.size();
 
  // for each new HcalZdcDetId, make a CaloCellGeometry

 for(std::vector<HcalZDCDetId>::const_iterator zdcIdItr = zdcIds.begin();
     zdcIdItr != zdcIds.end(); ++zdcIdItr)
   {
      geom->addCell( *zdcIdItr, makeCell(*zdcIdItr, geom ) );
   }
}

CaloCellGeometry*
ZdcHardcodeGeometryLoader::makeCell(const HcalZDCDetId& detId,
                                    ReturnType          geom) const 
{
   double zside ( detId.zside() ) ;

   const HcalZDCDetId::Section section ( detId.section() ) ;

   const int channel ( detId.channel() ) ;

//********* Here are all the hardcoded numbers you need to know, in **cm**
//********* Most are from the zdc.xml and zdclum.xml files ******

   static const double x0 ( 0 ) ; // these 3 are for the "mother" volume
   static const double y0 ( 0 ) ;
   static const double z0 ( 14000 ) ;

   static const double angEM  ( 0 ) ; // the angles of front face wrt vertical
   static const double angLUM ( 0 ) ;
   static const double angHAD ( atan( 1. ) ) ; // this is 45 deg

   // these dimensions are **half**-sizes

   static const double dxHAD ( 4.8 ) ;
   static const double dxEM  ( dxHAD/5. ) ;
   static const double dxLUM ( 4.8 ) ; // to be updated when known

   static const double dhEM  ( 6.25 ) ;
   static const double dhLUM ( 6.25 ) ; // to be updated when known
   static const double dhHAD ( 6.25 ) ;

   static const double dzEM  ( 33.*0.15 ) ;
   static const double dzLUM ( 23.5 ) ; // to be updated when known
   static const double dzHAD ( 0.82*6./cos(angHAD) ) ;

   // these are not half-dimensions, they are offsets from nominal
   // for the center-of-front-face points

   static const double xOffEM  ( -4.*dxEM ) ; 
   static const double xOffLUM ( 0 ) ; 
   static const double xOffHAD ( 0 ) ; 

   static const double yOffEM  ( 0 ) ; 
   static const double yOffLUM ( 0 ) ; 
   static const double yOffHAD ( 0 ) ; 

   static const double zOffEM  ( -49.85  - 0.15 ) ; 
   static const double zOffLUM ( -39.555        ) ; 
   static const double zOffHAD ( -29.00         ) ; 

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

   double dx, dh, dz, x, y, z, an ;

   if( section==HcalZDCDetId::EM )
   {
      dx = dxEM ;
      dh = dhEM ;
      dz = dzEM ;
      an = angEM ;
      x  = zside*( x0 + xOffEM + ( channel - 1.0 )*dxEM*2. ) ;
      y  = y0 + yOffEM ;
      z  = zside*( z0 + zOffEM ) ;
   }
   else
   {
      if( section==HcalZDCDetId::LUM )
      {
         dx = dxLUM ;
         dh = dhLUM ;
         dz = dzLUM ;
         an = angLUM ;
         x  = zside*( x0 + xOffLUM ) ;
         y  = y0 + yOffLUM ;
         z  = zside*( z0 + zOffLUM + ( channel - 1.0 )*dzLUM*2. ) ;
      }
      else
      {
         assert( section==HcalZDCDetId::HAD ) ;
         dx = dxHAD ;
         dh = dhHAD ;
         dz = dzHAD ;
         an = angHAD ;
         x  = zside*( x0 + xOffHAD ) ;
         y  = y0 + yOffHAD ;
         z  = zside*( z0 + zOffHAD + ( channel - 1.0 )*dzHAD*2. ) ;
      }
   }

   const GlobalPoint faceCenter ( x, y, z );

   const double dy ( dh*cos( an ) ) ;

   std::vector<double> zz ;
   zz.reserve( ZdcGeometry::k_NumberOfParametersPerShape ) ;
   zz.push_back( an ) ;
   zz.push_back( dx ) ;
   zz.push_back( dy ) ;
   zz.push_back( dz ) ;

   return new calogeom::IdealZDCTrapezoid( 
      faceCenter, 
      geom->cornersMgr(),
      CaloCellGeometry::getParmPtr( zz, 
                                    geom->parMgr(), 
                                    geom->parVecVec() ) );
}