ATLAS Offline Software
SpacePointCalibrator.cxx
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1 /*
2  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
3 */
4 #include "SpacePointCalibrator.h"
5 
14 #include "GaudiKernel/PhysicalConstants.h"
17 namespace {
18  constexpr double c_inv = 1./ Gaudi::Units::c_light;
19 }
20 
21 namespace MuonR4{
25  using namespace SegmentFit;
26 
27 
28  SpacePointCalibrator::SpacePointCalibrator(const std::string& type, const std::string &name, const IInterface* parent) :
29  base_class(type, name, parent) {}
30 
33  ATH_CHECK(m_idHelperSvc.retrieve());
34  ATH_CHECK(m_mdtCalibrationTool.retrieve(EnableTool{m_idHelperSvc->hasMDT()}));
36  return StatusCode::SUCCESS;
37  }
38 
40  const CalibratedSpacePoint& spacePoint,
41  const Amg::Vector3D& segPos,
42  const Amg::Vector3D& segDir,
43  const double timeDelay) const {
44  CalibSpacePointPtr calibSP{};
45  if (spacePoint.type() != xAOD::UncalibMeasType::Other){
46  calibSP = calibrate(ctx, spacePoint.spacePoint(), segPos, segDir, timeDelay);
47  } else {
48  calibSP = std::make_unique<CalibratedSpacePoint>(spacePoint);
49  }
50  if (spacePoint.fitState() == State::Outlier) {
51  calibSP->setFitState(State::Outlier);
52  }
53  return calibSP;
54  }
55 
57  CalibSpacePointVec&& spacePoints,
58  const Amg::Vector3D& segPos,
59  const Amg::Vector3D& segDir,
60  const double timeDelay) const {
61  for (CalibSpacePointPtr& sp : spacePoints){
62  sp = calibrate(ctx, *sp, segPos, segDir, timeDelay);
63  }
64  return spacePoints;
65  }
66 
68  const SpacePoint* spacePoint,
69  const Amg::Vector3D& posInChamb,
70  const Amg::Vector3D& dirInChamb,
71  const double timeOffset) const {
72 
73  SG::ReadHandle gctx{m_geoCtxKey, ctx};
74  const Amg::Vector3D& spPos{spacePoint->positionInChamber()};
75  const Amg::Transform3D& locToGlob{spacePoint->msSector()->localToGlobalTrans(*gctx)};
76  Amg::Vector3D chDir{spacePoint->directionInChamber()};
77 
78  // Adjust the space point position according to the external seed. But only if the space point
79  // is a 1D strip
80  Amg::Vector3D calibSpPos = spacePoint->dimension() == 2 ? spPos
81  : spPos + Amg::intersect<3>(posInChamb, dirInChamb, spPos, chDir).value_or(0) * chDir;
82 
83  CalibSpacePointPtr calibSP{};
84  switch (spacePoint->type()) {
86  const Amg::Vector3D locClosestApproach = posInChamb
87  + Amg::intersect<3>(spPos, chDir,
88  posInChamb, dirInChamb).value_or(0) * dirInChamb;
89 
90  Amg::Vector3D closestApproach{locToGlob* locClosestApproach};
91  const double timeOfArrival = closestApproach.mag() * c_inv + timeOffset;
92  AmgSymMatrix(2) jac{AmgSymMatrix(2)::Identity()};
93  jac.col(0) = spacePoint->normalInChamber().block<2,1>(0,0).unit();
94  jac.col(1) = spacePoint->directionInChamber().block<2,1>(0,0).unit();
95 
96  if (spacePoint->dimension() == 1) {
97  auto* dc = static_cast<const xAOD::MdtDriftCircle*>(spacePoint->primaryMeasurement());
98  MdtCalibInput calibInput{*dc, *gctx};
99  calibInput.setTrackDirection(locToGlob.linear() * dirInChamb);
100  calibInput.setTimeOfFlight(timeOfArrival);
101  calibInput.setClosestApproach(std::move(closestApproach));
102  ATH_MSG_VERBOSE("Parse hit calibration "<<m_idHelperSvc->toString(dc->identify())<<", "<<calibInput);
103  MdtCalibOutput calibOutput = m_mdtCalibrationTool->calibrate(ctx, calibInput);
104  State fitState{State::Valid};
105  AmgSymMatrix(2) diagCov{AmgSymMatrix(2)::Identity()};
106  diagCov(toInt(AxisDefs::eta), toInt(AxisDefs::eta)) = std::pow(0.5* dc->readoutElement()->activeTubeLength(dc->measurementHash()),2);
109  ATH_MSG_DEBUG("Failed to create a valid hit from "<<m_idHelperSvc->toString(dc->identify())
110  <<std::endl<<calibInput<<std::endl<<calibOutput);
111  fitState = State::FailedCalib;
112  diagCov(toInt(AxisDefs::phi), toInt(AxisDefs::phi)) = std::pow(dc->readoutElement()->innerTubeRadius(), 2);
113  } else {
114  double uncert = calibOutput.driftRadiusUncert();
116  uncert = std::hypot(uncert, calibOutput.driftUncertSigProp());
117  }
118  diagCov(toInt(AxisDefs::phi), toInt(AxisDefs::phi)) = std::pow(m_mdtErrorScale * uncert, 2);
119  }
120  calibSP = std::make_unique<CalibratedSpacePoint>(spacePoint, std::move(calibSpPos), std::move(chDir), fitState);
121  calibSP->setCovariance<2>(jac.inverse()*diagCov*jac);
122  calibSP->setDriftRadius(calibOutput.driftRadius());
123  } else {
124  auto* dc = static_cast<const xAOD::MdtTwinDriftCircle*>(spacePoint->primaryMeasurement());
125  MdtCalibInput calibInput{*dc, *gctx};
126  calibInput.setClosestApproach(closestApproach);
127  calibInput.setTimeOfFlight(timeOfArrival);
128 
129  MdtCalibInput twinInput{dc->twinIdentify(), dc->twinAdc(), dc->twinTdc(), dc->readoutElement(), *gctx};
130  twinInput.setClosestApproach(closestApproach);
131  twinInput.setTimeOfFlight(timeOfArrival);
132 
133  MdtCalibTwinOutput calibOutput = m_mdtCalibrationTool->calibrateTwinTubes(ctx,
134  std::move(calibInput),
135  std::move(twinInput));
136 
137  AmgSymMatrix(2) diagCov{AmgSymMatrix(2)::Identity()};
138  State fitState{State::Valid};
140  ATH_MSG_DEBUG("Failed to create a valid hit from "<<m_idHelperSvc->toString(dc->identify())
141  <<std::endl<<calibOutput);
142  diagCov(toInt(AxisDefs::phi), toInt(AxisDefs::phi)) = std::pow(dc->readoutElement()->innerTubeRadius(), 2);
143  diagCov(toInt(AxisDefs::eta), toInt(AxisDefs::eta)) = std::pow(0.5* dc->readoutElement()->activeTubeLength(dc->measurementHash()), 2);
144  fitState = State::FailedCalib;
145  } else {
147  diagCov(toInt(AxisDefs::eta), toInt(AxisDefs::eta)) = std::pow(calibOutput.sigmaZ(), 2);
148  }
149  calibSP = std::make_unique<CalibratedSpacePoint>(spacePoint, std::move(calibSpPos), std::move(chDir), fitState);
150  calibSP->setCovariance<2>(jac.inverse()*diagCov*jac);
151  calibSP->setDriftRadius(calibOutput.primaryDriftR());
152  }
153  break;
154  }
156  auto* strip = static_cast<const xAOD::RpcMeasurement*>(spacePoint->primaryMeasurement());
157 
159  const Amg::Transform3D toGasGap{strip->readoutElement()->globalToLocalTrans(*gctx, strip->layerHash()) * locToGlob};
160  const Amg::Vector3D lPos = toGasGap * calibSpPos;
161  using EdgeSide = MuonGMR4::RpcReadoutElement::EdgeSide;
162  calibSP = std::make_unique<CalibratedSpacePoint>(spacePoint, std::move(calibSpPos), std::move(chDir));
163  AmgSymMatrix(3) cov{AmgSymMatrix(3)::Identity()};
164  cov.block<2,2>(0, 0) = spacePoint->covariance();
165 
167 
168  const double time1 = strip->time()
169  - strip->readoutElement()->distanceToEdge(strip->layerHash(),
170  lPos.block<2,1>(0,0),
171  EdgeSide::readOut) /m_rpcSignalVelocity;
172 
173  if (spacePoint->dimension() == 2) {
174  auto* strip2 = static_cast<const xAOD::RpcMeasurement*>(spacePoint->secondaryMeasurement());
175 
176  const double time2 = strip2->time() -
177  strip2->readoutElement()->distanceToEdge(strip2->layerHash(),
178  Eigen::Rotation2D{M_PI_2}*lPos.block<2,1>(0,0),
179  EdgeSide::readOut)/m_rpcSignalVelocity;
181  calibSP->setTimeMeasurement(0.5*(time1 + time2));
183  cov(2,2) += std::pow(0.5*(time1 - time2), 2);
184  cov(2,1) = cov(1,2) = - strip->readoutElement()->stripPhiPitch() /m_rpcSignalVelocity / std::sqrt(12.)* std::sqrt(cov(2, 2));
185  cov(2,0) = cov(0,2) = - strip->readoutElement()->stripEtaPitch() /m_rpcSignalVelocity / std::sqrt(12.)* std::sqrt(cov(2, 2));
186 
187  } else {
188  calibSP->setTimeMeasurement(time1);
189  if (strip->measuresPhi()) {
190  cov(2,1) = cov(1,2) = - 0.5 *strip->readoutElement()->stripPhiLength() /m_rpcSignalVelocity * std::sqrt(cov(2, 2));
191  } else {
192  cov(2,0) = cov(0,2) = - 0.5 *strip->readoutElement()->stripEtaLength() /m_rpcSignalVelocity * std::sqrt(cov(2, 2));
193  }
194  }
195  calibSP->setCovariance<3>(std::move(cov));
197  ATH_MSG_VERBOSE("Create rpc space point "<<m_idHelperSvc->toString(strip->identify())<<", dimension "<<spacePoint->dimension()
198  << ", at "<<Amg::toString(calibSP->positionInChamber())<<", uncalib time: "
199  <<strip->time()<<", calib time: "<<calibSP->time()<<" cov " <<toString(calibSP->covariance()));
200  break;
201  }
204  calibSP = std::make_unique<CalibratedSpacePoint>(spacePoint, std::move(calibSpPos), std::move(chDir));
205  calibSP->setCovariance<2>(spacePoint->covariance());
206  break;
207  }
208  default:
209  ATH_MSG_WARNING("Do not know how to calibrate "<<m_idHelperSvc->toString(spacePoint->identify()));
210  }
211  return calibSP;
212  }
213 
215  const std::vector<const SpacePoint*>& spacePoints,
216  const Amg::Vector3D& posInChamb,
217  const Amg::Vector3D& dirInChamb,
218  const double timeOffset) const {
219  CalibSpacePointVec calibSpacePoints{};
220  calibSpacePoints.reserve(spacePoints.size());
221  for(const SpacePoint* spacePoint : spacePoints) {
222  CalibSpacePointPtr hit = calibrate(ctx, spacePoint, posInChamb, dirInChamb, timeOffset);
223  if (hit) calibSpacePoints.push_back(std::move(hit));
224  }
225  return calibSpacePoints;
226  }
227  double SpacePointCalibrator::driftVelocity(const EventContext& ctx,
228  const CalibratedSpacePoint& spacePoint) const {
229  if(spacePoint.type() == xAOD::UncalibMeasType::MdtDriftCircleType) {
230  const MuonCalib::MdtFullCalibData* calibConsts = m_mdtCalibrationTool->getCalibConstants(ctx, spacePoint.spacePoint()->identify());
231  bool valid{false};
232  const double driftTime = calibConsts->rtRelation->tr()->tFromR(spacePoint.driftRadius(), valid);
233  return calibConsts->rtRelation->rt()->driftVelocity(driftTime);
234  }
235  return 0.;
236  }
237  double SpacePointCalibrator::driftAcceleration(const EventContext& ctx,
238  const CalibratedSpacePoint& spacePoint) const {
239  if(spacePoint.type() == xAOD::UncalibMeasType::MdtDriftCircleType) {
240  const MuonCalib::MdtFullCalibData* calibConsts = m_mdtCalibrationTool->getCalibConstants(ctx, spacePoint.spacePoint()->identify());
241  bool valid{false};
242  const double driftTime = calibConsts->rtRelation->tr()->tFromR(spacePoint.driftRadius(), valid);
243  return calibConsts->rtRelation->rt()->driftAcceleration(driftTime);
244  }
245  return 0.;
246  }
247 }
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Definition: ISpacePointCalibrator.h:26
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Definition: MdtCalibOutput.cxx:56
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Returns the state of the calibrated space point.
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Returns the uncertainty on the drift radius.
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The calibrated Space point is created during the calibration process.
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The pointer to the space point out of which this space point has been built.
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The drift radius of the calibrated space point.
Definition: CalibratedSpacePoint.cxx:27
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Returns the drift radius of the calibrated object.
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