Detector.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 <FairVolume.h>
 
#include <TVirtualMC.h>
#include <TVirtualMCStack.h>
#include <TGeoVolume.h>
 
#include "DetectorsBase/Stack.h"
#include "ITSMFTSimulation/Hit.h"
#include "TRKSimulation/Detector.h"
#include "TRKBase/TRKBaseParam.h"
 
using o2::itsmft::Hit;
 
namespace o2
{
namespace trk
{
float getDetLengthFromEta(const float eta, const float radius)
{
  return 2. * (10. + radius * std::cos(2 * std::atan(std::exp(-eta))));
}
 
Detector::Detector()
  : o2::base::DetImpl<Detector>("TRK", true),
    mTrackData(),
    mHits(o2::utils::createSimVector<o2::itsmft::Hit>())
{
}
 
Detector::Detector(bool active)
  : o2::base::DetImpl<Detector>("TRK", true),
    mTrackData(),
    mHits(o2::utils::createSimVector<o2::itsmft::Hit>())
{
  auto& trkPars = TRKBaseParam::Instance();
 
  if (trkPars.configFile != "") {
    configFromFile(trkPars.configFile);
  } else {
    buildTRKNewVacuumVessel();
    configToFile();
    configServices();
  }
 
  LOGP(info, "Summary of TRK configuration:");
  for (auto& layer : mLayers) {
    LOGP(info, "Layer: {} name: {} r: {} cm | z: {} cm | thickness: {} cm", layer.getNumber(), layer.getName(), layer.getInnerRadius(), layer.getZ(), layer.getChipThickness());
  }
}
 
Detector::~Detector()
{
  if (mHits) {
    o2::utils::freeSimVector(mHits);
  }
}
 
void Detector::ConstructGeometry()
{
  createMaterials();
  createGeometry();
}
 
void Detector::configDefault()
{
 
  // Build TRK detector according to the scoping document
 
  mLayers.clear();
 
  LOGP(warning, "Loading Scoping Document configuration for ALICE3 TRK");
  mLayers.emplace_back(0, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(0)}, 0.5f, 50.f, 100.e-4);
  mLayers.emplace_back(1, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(1)}, 1.2f, 50.f, 100.e-4);
  mLayers.emplace_back(2, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(2)}, 2.5f, 50.f, 100.e-4);
  mLayers.emplace_back(3, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(3)}, 3.78f, 124.f, 100.e-3);
  mLayers.emplace_back(4, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(4)}, 7.f, 124.f, 100.e-3);
  mLayers.emplace_back(5, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(5)}, 12.f, 124.f, 100.e-3);
  mLayers.emplace_back(6, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(6)}, 20.f, 124.f, 100.e-3);
  mLayers.emplace_back(7, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(7)}, 30.f, 124.f, 100.e-3);
  mLayers.emplace_back(8, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(8)}, 45.f, 258.f, 100.e-3);
  mLayers.emplace_back(9, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(9)}, 60.f, 258.f, 100.e-3);
  mLayers.emplace_back(10, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(10)}, 80.f, 258.f, 100.e-3);
}
 
void Detector::buildTRKNewVacuumVessel()
{
  // Build the TRK detector according to changes proposed during
  // https://indico.cern.ch/event/1407704/
  // to adhere to the changes that were presented at the ALICE 3 Upgrade days in March 2024
  // L3 -> 7 cm, L4 -> 9 cm
 
  mLayers.clear();
 
  LOGP(warning, "Loading \"After Upgrade Days March 2024\" configuration for ALICE3 TRK");
  mLayers.emplace_back(0, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(0)}, 0.5f, 50.f, 100.e-4);
  mLayers.emplace_back(1, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(1)}, 1.2f, 50.f, 100.e-4);
  mLayers.emplace_back(2, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(2)}, 2.5f, 50.f, 100.e-4);
  mLayers.emplace_back(3, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(3)}, 7.f, 124.f, 100.e-3);
  mLayers.emplace_back(4, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(4)}, 9.f, 124.f, 100.e-3);
  mLayers.emplace_back(5, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(5)}, 12.f, 124.f, 100.e-3);
  mLayers.emplace_back(6, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(6)}, 20.f, 124.f, 100.e-3);
  mLayers.emplace_back(7, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(7)}, 30.f, 124.f, 100.e-3);
  mLayers.emplace_back(8, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(8)}, 45.f, 258.f, 100.e-3);
  mLayers.emplace_back(9, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(9)}, 60.f, 258.f, 100.e-3);
  mLayers.emplace_back(10, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(10)}, 80.f, 258.f, 100.e-3);
 
  auto& trkPars = TRKBaseParam::Instance();
 
  // Middle layers
  mLayers[3].setLayout(trkPars.layoutML);
  mLayers[4].setLayout(trkPars.layoutML);
  mLayers[5].setLayout(trkPars.layoutML);
  mLayers[6].setLayout(trkPars.layoutML);
 
  // Outer tracker
  mLayers[7].setLayout(trkPars.layoutOL);
  mLayers[8].setLayout(trkPars.layoutOL);
  mLayers[9].setLayout(trkPars.layoutOL);
  mLayers[10].setLayout(trkPars.layoutOL);
}
 
void Detector::configFromFile(std::string fileName)
{
  // Override the default geometry if config file provided
  std::ifstream confFile(fileName);
  if (!confFile.good()) {
    LOGP(fatal, "File {} not found, aborting.", fileName);
  }
 
  mLayers.clear();
 
  LOGP(info, "Overriding geometry of ALICE3 TRK using {} file.", fileName);
 
  std::string line;
  std::vector<float> tmpBuff;
  int layerCount{0};
  while (std::getline(confFile, line)) {
    if (line[0] == '/') {
      continue;
    }
    tmpBuff.clear();
    std::stringstream ss(line);
    float val;
    std::string substr;
    while (getline(ss, substr, '\t')) {
      tmpBuff.push_back(std::stof(substr));
    }
    mLayers.emplace_back(layerCount, std::string{GeometryTGeo::getTRKLayerPattern() + std::to_string(layerCount)}, tmpBuff[0], tmpBuff[1], tmpBuff[2]);
    ++layerCount;
  }
}
 
void Detector::configToFile(std::string fileName)
{
  LOGP(info, "Exporting TRK Detector layout to {}", fileName);
  std::ofstream conFile(fileName.c_str(), std::ios::out);
  conFile << "/// TRK configuration file: inn_radius  z_length  lay_thickness" << std::endl;
  for (auto layer : mLayers) {
    conFile << layer.getInnerRadius() << "\t" << layer.getZ() << "\t" << layer.getChipThickness() << std::endl;
  }
}
 
void Detector::configServices()
{
  mServices = TRKServices{2.6f, 50.f, 150.e-3};
}
 
void Detector::createMaterials()
{
  int ifield = 2;      // ?
  float fieldm = 10.0; // ?
  o2::base::Detector::initFieldTrackingParams(ifield, fieldm);
 
  float tmaxfdSi = 0.1;    // .10000E+01; // Degree
  float stemaxSi = 0.0075; //  .10000E+01; // cm
  float deemaxSi = 0.1;    // 0.30000E-02; // Fraction of particle's energy 0<deemax<=1
  float epsilSi = 1.0E-4;  // .10000E+01;
  float stminSi = 0.0;     // cm "Default value used"
 
  float tmaxfdAir = 0.1;        // .10000E+01; // Degree
  float stemaxAir = .10000E+01; // cm
  float deemaxAir = 0.1;        // 0.30000E-02; // Fraction of particle's energy 0<deemax<=1
  float epsilAir = 1.0E-4;      // .10000E+01;
  float stminAir = 0.0;         // cm "Default value used"
 
  float tmaxfdCer = 0.1;        // .10000E+01; // Degree
  float stemaxCer = .10000E+01; // cm
  float deemaxCer = 0.1;        // 0.30000E-02; // Fraction of particle's energy 0<deemax<=1
  float epsilCer = 1.0E-4;      // .10000E+01;
  float stminCer = 0.0;         // cm "Default value used"
 
  // AIR
  float aAir[4] = {12.0107, 14.0067, 15.9994, 39.948};
  float zAir[4] = {6., 7., 8., 18.};
  float wAir[4] = {0.000124, 0.755267, 0.231781, 0.012827};
  float dAir = 1.20479E-3;
 
  // Carbon fiber
  float aCf[2] = {12.0107, 1.00794};
  float zCf[2] = {6., 1.};
 
  o2::base::Detector::Mixture(1, "AIR$", aAir, zAir, dAir, 4, wAir);
  o2::base::Detector::Medium(1, "AIR$", 1, 0, ifield, fieldm, tmaxfdAir, stemaxAir, deemaxAir, epsilAir, stminAir);
 
  o2::base::Detector::Material(3, "SILICON$", 0.28086E+02, 0.14000E+02, 0.23300E+01, 0.93600E+01, 0.99900E+03);
  o2::base::Detector::Medium(3, "SILICON$", 3, 0, ifield, fieldm, tmaxfdSi, stemaxSi, deemaxSi, epsilSi, stminSi);
}
 
void Detector::createGeometry()
{
  TGeoManager* geoManager = gGeoManager;
  TGeoVolume* vALIC = geoManager->GetVolume("barrel");
  if (!vALIC) {
    LOGP(fatal, "Could not find barrel volume while constructing TRK geometry");
  }
  new TGeoVolumeAssembly(GeometryTGeo::getTRKVolPattern());
  TGeoVolume* vTRK = geoManager->GetVolume(GeometryTGeo::getTRKVolPattern());
  vALIC->AddNode(vTRK, 2, new TGeoTranslation(0, 30., 0));
 
  char vstrng[100] = "TRKVol";
  vTRK->SetTitle(vstrng);
 
  for (auto& layer : mLayers) {
    layer.createLayer(vTRK);
  }
 
  // Add service for inner tracker
  mServices.createServices(vTRK);
}
 
void Detector::InitializeO2Detector()
{
  LOG(info) << "Initialize TRK O2Detector";
  mGeometryTGeo = GeometryTGeo::Instance();
  defineSensitiveVolumes();
}
 
void Detector::defineSensitiveVolumes()
{
  TGeoManager* geoManager = gGeoManager;
  TGeoVolume* v;
 
  TString volumeName;
  LOGP(info, "Adding TRK Sensitive Volumes");
 
  // The names of the TRK sensitive volumes have the format: TRKLayer(0...mLayers.size()-1)
  for (int j{0}; j < mLayers.size(); j++) {
    volumeName = GeometryTGeo::getTRKSensorPattern() + TString::Itoa(j, 10);
    LOGP(info, "Trying {}", volumeName.Data());
    v = geoManager->GetVolume(volumeName.Data());
    LOGP(info, "Adding TRK Sensitive Volume {}", v->GetName());
    AddSensitiveVolume(v);
  }
}
 
void Detector::EndOfEvent() { Reset(); }
 
void Detector::Register()
{
  // This will create a branch in the output tree called Hit, setting the last
  // parameter to kFALSE means that this collection will not be written to the file,
  // it will exist only during the simulation
 
  if (FairRootManager::Instance()) {
    FairRootManager::Instance()->RegisterAny(addNameTo("Hit").data(), mHits, true);
  }
}
 
void Detector::Reset()
{
  if (!o2::utils::ShmManager::Instance().isOperational()) {
    mHits->clear();
  }
}
 
bool Detector::ProcessHits(FairVolume* vol)
{
  // This method is called from the MC stepping
  if (!(fMC->TrackCharge())) {
    return false;
  }
 
  int lay = vol->getVolumeId();
  int volID = vol->getMCid();
 
  // Is it needed to keep a track reference when the outer ITS volume is encountered?
  auto stack = (o2::data::Stack*)fMC->GetStack();
  if (fMC->IsTrackExiting() && (lay == 0 || lay == mLayers.size() - 1)) {
    // Keep the track refs for the innermost and outermost layers only
    o2::TrackReference tr(*fMC, GetDetId());
    tr.setTrackID(stack->GetCurrentTrackNumber());
    tr.setUserId(lay);
    stack->addTrackReference(tr);
  }
  bool startHit = false, stopHit = false;
  unsigned char status = 0;
  if (fMC->IsTrackEntering()) {
    status |= Hit::kTrackEntering;
  }
  if (fMC->IsTrackInside()) {
    status |= Hit::kTrackInside;
  }
  if (fMC->IsTrackExiting()) {
    status |= Hit::kTrackExiting;
  }
  if (fMC->IsTrackOut()) {
    status |= Hit::kTrackOut;
  }
  if (fMC->IsTrackStop()) {
    status |= Hit::kTrackStopped;
  }
  if (fMC->IsTrackAlive()) {
    status |= Hit::kTrackAlive;
  }
 
  // track is entering or created in the volume
  if ((status & Hit::kTrackEntering) || (status & Hit::kTrackInside && !mTrackData.mHitStarted)) {
    startHit = true;
  } else if ((status & (Hit::kTrackExiting | Hit::kTrackOut | Hit::kTrackStopped))) {
    stopHit = true;
  }
 
  // increment energy loss at all steps except entrance
  if (!startHit) {
    mTrackData.mEnergyLoss += fMC->Edep();
  }
  if (!(startHit | stopHit)) {
    return false; // do noting
  }
 
  if (startHit) {
    mTrackData.mEnergyLoss = 0.;
    fMC->TrackMomentum(mTrackData.mMomentumStart);
    fMC->TrackPosition(mTrackData.mPositionStart);
    mTrackData.mTrkStatusStart = status;
    mTrackData.mHitStarted = true;
  }
  if (stopHit) {
    TLorentzVector positionStop;
    fMC->TrackPosition(positionStop);
    // Retrieve the indices with the volume path
    int stave(0), halfstave(0), chipinmodule(0), module;
    fMC->CurrentVolOffID(1, chipinmodule);
    fMC->CurrentVolOffID(2, module);
    fMC->CurrentVolOffID(3, halfstave);
    fMC->CurrentVolOffID(4, stave);
 
    Hit* p = addHit(stack->GetCurrentTrackNumber(), lay, mTrackData.mPositionStart.Vect(), positionStop.Vect(),
                    mTrackData.mMomentumStart.Vect(), mTrackData.mMomentumStart.E(), positionStop.T(),
                    mTrackData.mEnergyLoss, mTrackData.mTrkStatusStart, status);
    // p->SetTotalEnergy(vmc->Etot());
 
    // RS: not sure this is needed
    // Increment number of Detector det points in TParticle
    stack->addHit(GetDetId());
  }
 
  return true;
}
 
o2::itsmft::Hit* Detector::addHit(int trackID, int detID, const TVector3& startPos, const TVector3& endPos,
                                  const TVector3& startMom, double startE, double endTime, double eLoss, unsigned char startStatus,
                                  unsigned char endStatus)
{
  mHits->emplace_back(trackID, detID, startPos, endPos, startMom, startE, endTime, eLoss, startStatus, endStatus);
  return &(mHits->back());
}
} // namespace trk
} // namespace o2
 
ClassImp(o2::trk::Detector);
 
// Define Factory method for calling from the outside
extern "C" {
o2::base::Detector* create_detector_trk(bool active)
{
  return o2::trk::Detector::create(active);
}
}