Geometry.cxx

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#include "TSystem.h"
 
#include <fairlogger/Logger.h>
 
#include "MFTBase/Geometry.h"
#include "MFTBase/GeometryBuilder.h"
#include "MFTBase/Segmentation.h"
#include "MFTBase/HalfSegmentation.h"
#include "MFTBase/HalfDiskSegmentation.h"
#include "MFTBase/LadderSegmentation.h"
#include "MFTBase/ChipSegmentation.h"
 
using namespace o2::mft;
 
ClassImp(o2::mft::Geometry);
 
const Double_t Geometry::sSensorInterspace = 0.01; //[cm]  Offset between two adjacent chip on a ladder
const Double_t Geometry::sSensorSideOffset = 0.04; // [cm] Side Offset between the ladder edge and the chip edge
const Double_t Geometry::sSensorTopOffset = 0.04;  // [cm] Top Offset between the ladder edge and the chip edge
const Double_t Geometry::sLadderOffsetToEnd =
  4.7;                                              // [cm] Offset between the last Chip and the end of the ladder toward the DAQ connector
const Double_t Geometry::sSensorThickness = 30.e-4; // 50 microns
const Double_t Geometry::sChipThickness = 50.e-4;   // 50 microns
 
// Allmost everything you wanted to know about the FPC
const Double_t Geometry::sLineWidth = 100.e-4;       // line width, 100 microns
const Double_t Geometry::sVarnishThickness = 20.e-4; // 20 micron FPC
const Double_t Geometry::sAluThickness = 25.e-4;     // 25 microns
const Double_t Geometry::sKaptonThickness = 75.e-4;  // 75 microns FPC
const Double_t Geometry::sFlexThickness =
  sKaptonThickness + 2 * sAluThickness + 2 * sVarnishThickness; // total thickness of a FPC
const Double_t Geometry::sFlexHeight = 1.68;
const Double_t Geometry::sClearance = 300.e-4;   // 300 microns clearance without any conducting metal all around the FPC
const Double_t Geometry::sRadiusHole1 = 0.125;   // diameter of the FPC crew, closest to the FPC electric connector
const Double_t Geometry::sRadiusHole2 = 0.1;     // diameter of the FPC pin locator, after the previous hole crew
const Double_t Geometry::sHoleShift1 = 2.8;      // shift of the FPC crew
const Double_t Geometry::sHoleShift2 = 3.6;      // shift of the FPC pin locator
const Double_t Geometry::sConnectorOffset = 0.4; // distance between the connector and the start of the FPC
const Double_t Geometry::sCapacitorDx = 0.05;
const Double_t Geometry::sCapacitorDy = 0.1;
const Double_t Geometry::sCapacitorDz = 0.05;
const Double_t Geometry::sConnectorLength = 0.1;
const Double_t Geometry::sConnectorWidth = 0.025;
const Double_t Geometry::sConnectorHeight = 0.1;
const Double_t Geometry::sConnectorThickness = 0.01;
const Double_t Geometry::sShiftDDGNDline =
  0.4;                                       // positionning of the line to separate AVDD/DVDD et AGND/DGND on the FPC
const Double_t Geometry::sShiftline = 0.025; // positionning of the line along the FPC side
const Double_t Geometry::sEpsilon = 0.0001;  // to see the removed volumes produced by TGeoSubtraction
 
const Double_t Geometry::sGlueThickness = 100.e-4;                  // 100 microns of SE4445 to be confirmed
const Double_t Geometry::sGlueEdge = 300.e-4;                       // in case the glue is not spreaded on the whole surface of the sensor
const Double_t Geometry::sGlueRohacellCarbonThickness = 0.0025 / 2; // glue betweeen the carbone plates and the rohacell
const Double_t Geometry::sKaptonOnCarbonThickness = 0.0013 / 2;     // thickness of the kapton layer on the heat exchanger carbone plate
const Double_t Geometry::sKaptonGlueThickness = 0.0027 / 2;         // thickness of the kapton layer glue
 
const Int_t Geometry::sGrooves = 1; // 0 without grooves, 1 with grooves
 
// need to do this, because of the different conventions between
// ITS and MFT in placing the chips (rows, cols) in the geometry
// at construction time
//
// xITS    0  +1   0   xMFT
// yITS =  0   0  -1 * yMFT
// zITS   -1   0   0   zMFT
//
 
TGeoHMatrix Geometry::sTransMFT2ITS = [] {
  TGeoHMatrix tmp;
  Double_t rot[9] = {0., 1., 0., 0., 0., -1., -1., 0., 0.};
  tmp.SetRotation(rot);
  // equivalent to
  // tmp.RotateY(90.);
  // tmp.RotateZ(-90.);
  return tmp;
}();
 
Geometry* Geometry::sInstance = nullptr;
 
 
//____________________________________________________________________
Geometry* Geometry::instance()
{
 
  if (!sInstance) {
    sInstance = new Geometry();
  }
  return sInstance;
}
 
 
//_____________________________________________________________________________
Geometry::Geometry()
  : TNamed("MFT", "Muon Forward Tracker"), mBuilder(nullptr), mSegmentation(nullptr), mSensorVolumeID(0)
{
  // default constructor
}
 
//_____________________________________________________________________________
Geometry::~Geometry()
{
  // destructor
 
  delete mBuilder;
  delete mSegmentation;
}
 
//_____________________________________________________________________________
void Geometry::build()
{
 
  // load the detector segmentation
  if (!mSegmentation) {
    mSegmentation = new Segmentation(gSystem->ExpandPathName("$(VMCWORKDIR)/Detectors/Geometry/MFT/data/Geometry.xml"));
  }
 
  // build the geometry
  if (!mBuilder) {
    mBuilder = new GeometryBuilder();
  }
  mBuilder->buildGeometry();
  delete mBuilder;
}
 
 
//_____________________________________________________________________________
UInt_t Geometry::getObjectID(ObjectTypes type, Int_t half, Int_t disk, Int_t plane, Int_t ladder, Int_t chip) const
{
 
  UInt_t uniqueID = ((type + 1) << 16) + ((half + 1) << 14) + ((disk + 1) << 11) + ((plane + 1) << 9) +
                    ((ladder + 1) << 3) + (chip + 1);
 
  return uniqueID;
}
 
 
//_____________________________________________________________________________
Int_t Geometry::getDiskNSensors(Int_t diskId) const
{
 
  Int_t nSensors = 0;
  for (int iHalf = 0; iHalf < 2; iHalf++) {
    HalfDiskSegmentation* diskSeg = mSegmentation->getHalf(iHalf)->getHalfDisk(diskId);
    if (diskSeg) {
      nSensors += diskSeg->getNChips();
    }
  }
  return nSensors;
}
 
 
//_____________________________________________________________________________
Int_t Geometry::getDetElemLocalID(Int_t detElemID) const
{
 
  return mSegmentation->getDetElemLocalID(getHalfID(detElemID), getDiskID(detElemID), getLadderID(detElemID),
                                          getSensorID(detElemID));
}