SctSensorSD.cxx

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/*
  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
*/
 
//
// SCT Sensitive Detector.
// The Hits are processed here. For every hit I get the position and
// an information on the sensor in which the interaction happened
//
 
// class headers
#include "SctSensorSD.h"
 
// athena includes
#include "MCTruth/TrackHelper.h"
 
// Geant4 includes
#include "G4Step.hh"
#include "G4ThreeVector.hh"
#include "G4SDManager.hh"
#include "G4Geantino.hh"
#include "G4ChargedGeantino.hh"
 
// CLHEP transform
#include "CLHEP/Geometry/Transform3D.h"
 
#include <memory> // For make unique
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
SctSensorSD::SctSensorSD( const std::string& name, const std::string& hitCollectionName )
  : G4VSensitiveDetector( name )
  , m_HitColl( hitCollectionName )
{
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void SctSensorSD::Initialize(G4HCofThisEvent *)
{
  if (!m_HitColl.isValid()) m_HitColl = std::make_unique<SiHitCollection>();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4bool SctSensorSD::ProcessHits(G4Step* aStep, G4TouchableHistory* /*ROhist*/)
{
  double edep = aStep->GetTotalEnergyDeposit();
  if(edep==0.) {
    if(aStep->GetTrack()->GetDefinition()!=G4Geantino::GeantinoDefinition() &&
       aStep->GetTrack()->GetDefinition()!=G4ChargedGeantino::ChargedGeantinoDefinition())
      return false;
  }
  edep *= CLHEP::MeV;
  //
  // Get the Touchable History:
  //
  const G4TouchableHistory *myTouch = dynamic_cast<const G4TouchableHistory*>(aStep->GetPreStepPoint()->GetTouchable());
  if (not myTouch) {
    G4cout << "SctSensorSD::ProcessHits bad dynamic_cast" << G4endl;
    return false;
  }
  //
  // Get the hit coordinates. Start and End Point
  //
  G4ThreeVector coord1 = aStep->GetPreStepPoint()->GetPosition();
  G4ThreeVector coord2 = aStep->GetPostStepPoint()->GetPosition();
  //
  // Calculate the local step begin and end position.
  // From a G4 FAQ:
  // http://geant4-hn.slac.stanford.edu:5090/HyperNews/public/get/geometry/17/1.html
  //
  const G4AffineTransform transformation = myTouch->GetHistory()->GetTopTransform();
  G4ThreeVector localPosition1 = transformation.TransformPoint(coord1);
  G4ThreeVector localPosition2 = transformation.TransformPoint(coord2);
  //
  // Get it into a vector in local coords and with the right units:
  //
  HepGeom::Point3D<double> lP1,lP2;
 
  lP1[SiHit::xEta] = localPosition1[2]*CLHEP::mm;
  lP1[SiHit::xPhi] = localPosition1[1]*CLHEP::mm;
  lP1[SiHit::xDep] = localPosition1[0]*CLHEP::mm;
 
  lP2[SiHit::xEta] = localPosition2[2]*CLHEP::mm;
  lP2[SiHit::xPhi] = localPosition2[1]*CLHEP::mm;
  lP2[SiHit::xDep] = localPosition2[0]*CLHEP::mm;
 
  // Now Navigate the history to know in what detector the step is:
  // and finally set the ID of det element in which the hit is.
  //
  //G4int History;
  //
  // Is it TB, barrel or endcap?
  //
  int brlEcap = 0;
  int layerDisk = 0;
  int etaMod = 0;
  int phiMod = 0;
  int side = 0;
  this->indexMethod(myTouch, coord1.z(), brlEcap, layerDisk, etaMod, phiMod, side);
  // get the HepMcParticleLink from the TrackHelper
  TrackHelper trHelp(aStep->GetTrack());
  m_HitColl->Emplace(lP1,
                     lP2,
                     edep,
                     aStep->GetPreStepPoint()->GetGlobalTime(),//use the global time. i.e. the time from the beginning of the event
                     trHelp.GenerateParticleLink(),
                     1,brlEcap,layerDisk,etaMod,phiMod,side);
  return true;
}
 
void SctSensorSD::indexMethod(const G4TouchableHistory *myTouch, double coord1z,
                              int &brlEcap, int &layerDisk, int &etaMod, int &phiMod, int &side) {
 
 
 //
  // In the case of the TB the positioning integers won't be initialized
  // and the identifying integer will be zero. There is no need to do
  // anything else
 
  const int sensorCopyNo = myTouch->GetVolume()->GetCopyNo();
 
  if (verboseLevel>5){
    for (int i=0;i<myTouch->GetHistoryDepth();i++){
      std::string detname=myTouch->GetVolume(i)->GetLogicalVolume()->GetName();
      int copyno=myTouch->GetVolume(i)->GetCopyNo();
      G4cout << "Volume "<<detname << " Copy Nr. " << copyno << G4endl;
    }
  }
 
  // Barrel geometry from GeoModel. Flag it with a 1000 in the IdTag
  //
  if(sensorCopyNo/1000) {
    // Barrel
    if(sensorCopyNo == 1000) {
      side = myTouch->GetVolume(1)->GetCopyNo();
      etaMod = myTouch->GetVolume(2)->GetCopyNo();
      phiMod = myTouch->GetVolume(3)->GetCopyNo();
      layerDisk = myTouch->GetVolume(5)->GetCopyNo();
    } else if(sensorCopyNo == 1100) {
      // SLHC stave layout
      int etaModTmp = myTouch->GetVolume(1)->GetCopyNo();
      int sign = (etaModTmp>=0)? +1 : -1;
      side = std::abs(etaModTmp)%2;
      etaMod = sign * std::abs(etaModTmp)/2;
      phiMod = myTouch->GetVolume(2)->GetCopyNo();
      layerDisk = myTouch->GetVolume(4)->GetCopyNo();
    } else if(sensorCopyNo/100 == 12) {
      // Segmented sensor (SLHC only)
      int iSegment = sensorCopyNo%100;
      int sensorEnvCopyNo = myTouch->GetVolume(1)->GetCopyNo();
      if (sensorEnvCopyNo == 1000) {
        side = myTouch->GetVolume(2)->GetCopyNo();
        etaMod = myTouch->GetVolume(3)->GetCopyNo() + iSegment;
        phiMod = myTouch->GetVolume(4)->GetCopyNo();
        layerDisk = myTouch->GetVolume(6)->GetCopyNo();
      } else if  (sensorEnvCopyNo == 1100) {
        // Stave layout
        int etaModTmp = myTouch->GetVolume(2)->GetCopyNo();
        int sign = (etaModTmp>=0)? +1 : -1;
        side = std::abs(etaModTmp)%2;
        etaMod = sign * std::abs(etaModTmp)/2 + iSegment;
        phiMod = myTouch->GetVolume(3)->GetCopyNo();
        layerDisk = myTouch->GetVolume(5)->GetCopyNo();
      } else {
        G4ExceptionDescription description;
        description << "ProcessHits: Unrecognized geometry in SCT sensitive detector. Please contact the maintainer of the SCT Detector Description.";
        G4Exception("SctSensorSD", "UnrecognizedSCTGeometry1", FatalException, description);
        abort();
      }
    } else {
      G4ExceptionDescription description;
      description << "ProcessHits: Unrecognized geometry in SCT sensitive detector. Please contact the maintainer of the SCT Detector Description.";
      G4Exception("SctSensorSD", "UnrecognizedSCTGeometry2", FatalException, description);
      abort();
    }
    if (verboseLevel>5){
      G4cout << "In the SCT Barrel" << G4endl;
      G4cout << "----- side       : " << side << G4endl;
      G4cout << "----- eta_module : " << etaMod << G4endl;
      G4cout << "----- phi_module : " << phiMod << G4endl;
      G4cout << "----- layer      : " << layerDisk << G4endl;
      G4cout << "----- barrel_ec  : " << brlEcap<< G4endl;
    }
  } else {
    // Endcap geometry from GeoModel. Flag it with a 500 or 600 in the IdTag
    // The level in the hierarchy is different for different geometries
    // 500 For pre DC3
    // 600 For DC3 and later (including SLHC)
    int sensorCopyNoTest =  sensorCopyNo/100;
    if(sensorCopyNoTest == 5 || sensorCopyNoTest == 6) {
      int signZ = (coord1z > 0) ? 1 : -1;
      brlEcap = 2 * signZ;
      side      = myTouch->GetVolume(0)->GetCopyNo() % 2;
      if (sensorCopyNoTest == 5) { // DC2 and Rome
        etaMod    = myTouch->GetVolume(3)->GetCopyNo();
        layerDisk = myTouch->GetVolume(4)->GetCopyNo();
      } else { // DC3 and later and SLHC
        etaMod    = myTouch->GetVolume(2)->GetCopyNo();
        layerDisk = myTouch->GetVolume(3)->GetCopyNo();
      }
      int phiNumber = myTouch->GetVolume(1)->GetCopyNo();
      // Number of modules in ring and module which becomes 0 is encoded in the copy number.
      // This is in order to recreate the correct id in the negative endcap.
      int maxModules = (phiNumber & 0x00ff0000) >> 16;
      int moduleZero = (phiNumber & 0xff000000) >> 24; // When phiMod = moduleZero -> 0 after inverting
      phiMod = phiNumber & 0x0000ffff;
      // If -ve endcap then invert numbering
      // maxModules is non-zero, but check for maxModules != 0  safeguards
      // against divide by zero (in case we create a geometry without the encoding).
      if (maxModules && signZ < 0) phiMod = (maxModules + moduleZero - phiMod) % maxModules;
 
      // Some printout
      if (verboseLevel>5){
        G4cout << "In the SCT EndCap" << G4endl;
        G4cout << "----- side       : " << side << G4endl;
        G4cout << "----- phi_module : " << phiMod<< G4endl;
        G4cout << "----- eta_module : " << etaMod << G4endl;
        G4cout << "----- layerDisk  : " << layerDisk << G4endl;
        G4cout << "----- barrel_ec  : " << brlEcap << G4endl;
      }
    } else {
      // Do not expect other numbers. Need to fix SCT_GeoModel or SCT_SLHC_GeoModel if this occurs.
      G4ExceptionDescription description;
      description << "ProcessHits: Unrecognized geometry in SCT sensitive detector. Please contact the maintainer of the SCT Detector Description.";
      G4Exception("SctSensorSD", "UnrecognizedSCTGeometry3", FatalException, description);
      abort();
    }
  }
  return;
}