DTTopology Class Reference

#include <DTTopology.h>

Inheritance diagram for DTTopology:

Public Types
enum	Side {   zMin, zMax, xMin, xMax,   yMin, yMax, none }
	Sides of the cell. More...
Public Types inherited from Topology
typedef Point2DBase< double, LocalTag >	Local2DPoint
typedef Vector2D::MathVector	MathVector2D
typedef Basic2DVector< double >	Vector2D

Public Member Functions
float	cellHeight () const
	Returns the cell height. More...
float	cellLenght () const
float	cellWidth () const
	Returns the cell width. More...
int	channel (const LocalPoint &p) const
int	channels () const
	Returns the number of wires in the layer. More...
	DTTopology (int firstWire, int nChannels, float semilenght)
	Constructor: number of first wire, total # of wires in the layer and their lenght. More...
int	firstChannel () const
	Returns the wire number of the first wire. More...
bool	isWireValid (const int wireNumber) const
int	lastChannel () const
	Returns the wire number of the last wire. More...
LocalError	localError (const MeasurementPoint &, const MeasurementError &) const
LocalPoint	localPosition (const MeasurementPoint &) const
MeasurementError	measurementError (const LocalPoint &, const LocalError &) const
	Conversion to the measurement frame. More...
MeasurementPoint	measurementPosition (const LocalPoint &) const
Side	onWhichBorder (float x, float y, float z) const
Side	onWhichBorder_old (float x, float y, float z) const
	Returns the side of the cell in which resides the point (x,y,z) (old cell geometry). More...
float	sensibleHeight () const
	Returns the height of the actual sensible volume of the cell. More...
float	sensibleWidth () const
	Returns the width of the actual sensible volume of the cell. More...
float	wirePosition (int wireNumber) const
	Returns the x position in the layer of a given wire number. More...
virtual	~DTTopology ()
Public Member Functions inherited from Topology
virtual int	channel (const LocalPoint &lp, const LocalTrackAngles &) const
	conversion taking also the angle from the track state More...
virtual LocalError	localError (const MeasurementPoint &mp, const MeasurementError &me, const LocalTrackPred &) const
	conversion taking also the angle from the predicted track state More...
virtual LocalPoint	localPosition (const MeasurementPoint &mp, const LocalTrackPred &) const
	conversion taking also the angle from the predicted track state More...
virtual MeasurementError	measurementError (const LocalPoint &lp, const LocalError &le, const LocalTrackAngles &) const
	conversion taking also the angle from the track state More...
virtual MeasurementPoint	measurementPosition (const LocalPoint &lp, const LocalTrackAngles &) const
	conversion taking also the angle from the track state More...
virtual	~Topology ()

Private Attributes
int	theFirstChannel
float	theLength
int	theNChannels
Local2DPoint	theOffSet

Static Private Attributes
static const float	IBeamThickness = 0.13
static const float	IBeamWingLength = 0.635
static const float	IBeamWingThickness = 0.13
static const float	plateThickness = 0.15
static const float	theHeight = 1.3
static const float	theWidth = 4.2

Detailed Description

Conversion between the local frame of the DT DetUnits (i.e. a layer of cells in a superlayer) and the "measurement frame". This is a rectangular frame where x runs between (FirstCellNumber-0.5) and (LastCellNumber+0.5). Note that cell numbers follow the hardware convention, so that FirstCellNumber is either 1 or 2 depending of the layer.

Note that DTs measure a time, not a position, so unlike for strip detectors, there is no guarantee that a measurement in a cell will not end up in the neighbouring cell. This must be taken into account for all cases where a * LocalPoint is used as an argument, e.g. to get back the channel number. This will be an issue if wire misalignment is introduced.

The Topology interface is extended with methods relevant for the DT detectors, e.g. wirePosition(int), etc.

Author

R. Bellan - INFN Torino

Definition at line 28 of file DTTopology.h.

Member Enumeration Documentation

enum DTTopology::Side

Sides of the cell.

Enumerator
zMin
zMax
xMin
xMax
yMin
yMax
none

Definition at line 88 of file DTTopology.h.

{zMin,zMax,xMin,xMax,yMin,yMax,none}; 

Constructor & Destructor Documentation

DTTopology::DTTopology	(	int	firstWire,
		int	nChannels,
		float	semilenght
	)

Constructor: number of first wire, total # of wires in the layer and their lenght.

Definition at line 22 of file DTTopology.cc.

References gather_cfg::cout, theFirstChannel, theHeight, theLength, theNChannels, theOffSet, and theWidth.

                                                                   : theFirstChannel(firstWire),
                                                                   theNChannels(nChannels),
                                                                   theLength(semilenght*2){
  theOffSet = Local2DPoint(-theNChannels/2. * theWidth, -theLength/2.);
  
#ifdef VERBOSE
  cout <<"Constructing DTTopology with:"<<endl
       <<"number of wires = "<<theNChannels
       <<", first wire number = "<<theFirstChannel<<endl
       <<", width = "<<theWidth
       <<", height = "<<theHeight
       <<", length = "<<theLength
       <<endl;
#endif
}

virtual DTTopology::~DTTopology ( )

inlinevirtual

Definition at line 34 of file DTTopology.h.

{}

Member Function Documentation

float DTTopology::cellHeight ( ) const

inline

Returns the cell height.

Definition at line 70 of file DTTopology.h.

References theHeight.

Referenced by FWRecoGeometryESProducer::addDTGeometry(), and DTDigitizer::dumpHit().

{return theHeight;}

float DTTopology::cellLenght ( ) const

inline

Returns the cell length. This is the length of the sensitive volume, i.e. lenght of the wire minus the lenght of the two tappini (1.55 mm each)

Definition at line 73 of file DTTopology.h.

References theLength.

Referenced by FWRecoGeometryESProducer::addDTGeometry(), DTDigitizer::dumpHit(), DTDigitizer::externalDelays(), DTTTrigSyncTOFCorr::offset(), DTTTrigSyncFromDB::offset(), and DTRecHitQuality::simHitDistFromFE().

{return theLength;}

float DTTopology::cellWidth ( ) const

inline

Returns the cell width.

Definition at line 68 of file DTTopology.h.

References theWidth.

Referenced by FWRecoGeometryESProducer::addDTGeometry(), DTDigitizer::dumpHit(), DTTrigGeomUtils::phiRange(), and DTTrigGeomUtils::thetaRange().

{return theWidth;}

int DTTopology::channel ( const LocalPoint &  p ) const

virtual

Return the wire number, starting from a LocalPoint. This method is deprecated: when converting the position of a rechit, there is no guarantee that the converted value can be interpreted as the cell where the hit belongs, see note on neighbouring cells in the class header.

Implements Topology.

Definition at line 79 of file DTTopology.cc.

References theFirstChannel, theOffSet, theWidth, PV2DBase< T, PVType, FrameType >::x(), and PV3DBase< T, PVType, FrameType >::x().

Referenced by MuonSimHitProducer::produce().

{
  return static_cast<int>( (lp.x()-theOffSet.x())/theWidth + theFirstChannel);
}

int DTTopology::channels ( ) const

inline

Returns the number of wires in the layer.

Definition at line 75 of file DTTopology.h.

References theNChannels.

Referenced by FWRecoGeometryESProducer::addDTGeometry(), DTTrigGeom::getGeom(), DTTrigGeomUtils::phiRange(), and DTTrigGeomUtils::thetaRange().

{return theNChannels;} 

int DTTopology::firstChannel ( ) const

inline

Returns the wire number of the first wire.

Definition at line 78 of file DTTopology.h.

References theFirstChannel.

Referenced by FWRecoGeometryESProducer::addDTGeometry(), DTTPDeadWriter::analyze(), DTNoiseCalibration::analyze(), DTt0DBValidation::beginRun(), dtCalibration::DTT0WireInChamberReferenceCorrection::correction(), DTT0Correction::endJob(), DTNoiseCalibration::endJob(), DTTrigGeom::getGeom(), DTLocalTriggerBaseTest::phiRange(), MuonSimHitProducer::produce(), and ValidateGeometry::validateDTLayerGeometry().

{return theFirstChannel;} 

bool DTTopology::isWireValid ( const int  wireNumber ) const

inline

Definition at line 65 of file DTTopology.h.

References lastChannel(), and theFirstChannel.

Referenced by DTLinearDriftAlgo::compute(), DTLinearDriftFromDBAlgo::compute(), DTNoDriftAlgo::compute(), and wirePosition().

{return (wireNumber - (theFirstChannel - 1) <= 0 || wireNumber - lastChannel() > 0 ) ? false : true;}

int DTTopology::lastChannel ( ) const

inline

Returns the wire number of the last wire.

Definition at line 80 of file DTTopology.h.

References theFirstChannel, and theNChannels.

Referenced by FWRecoGeometryESProducer::addDTGeometry(), DTNoiseCalibration::analyze(), DTnoiseDBValidation::beginRun(), DTt0DBValidation::beginRun(), DTT0Correction::endJob(), DTNoiseCalibration::endJob(), isWireValid(), DTLocalTriggerBaseTest::phiRange(), MuonSimHitProducer::produce(), ValidateGeometry::validateDTLayerGeometry(), and wirePosition().

{return theNChannels+theFirstChannel-1;} 

LocalError DTTopology::localError ( const MeasurementPoint &  , const MeasurementError &  me  ) const

virtual

Conversion between measurement coordinates and local cartesian coordinates.

Implements Topology.

Definition at line 58 of file DTTopology.cc.

References theLength, theWidth, MeasurementError::uu(), and MeasurementError::vv().

{
  return LocalError(me.uu()*(theWidth*theWidth), 0,
                    me.vv()*(theLength*theLength));
}

LocalPoint DTTopology::localPosition ( const MeasurementPoint &  mp ) const

virtual

Conversion between measurement coordinates and local cartesian coordinates.

Implements Topology.

Definition at line 51 of file DTTopology.cc.

References theFirstChannel, theLength, theOffSet, theWidth, PV2DBase< T, PVType, FrameType >::x(), and PV2DBase< T, PVType, FrameType >::y().

{
    return LocalPoint( (mp.x() - theFirstChannel)*theWidth + theOffSet.x() , 
                       (1-mp.y())*theLength + theOffSet.y());
}

MeasurementError DTTopology::measurementError ( const LocalPoint &  , const LocalError &  le  ) const

virtual

Conversion to the measurement frame.

Implements Topology.

Definition at line 72 of file DTTopology.cc.

References theLength, theWidth, LocalError::xx(), and LocalError::yy().

{
  return MeasurementError(le.xx()/(theWidth*theWidth),0,
                          le.yy()/(theLength*theLength));
}

MeasurementPoint DTTopology::measurementPosition ( const LocalPoint &  lp ) const

virtual

Conversion to the measurement frame. (Caveat: when converting the position of a rechit, there is no guarantee that the converted value can be interpreted as the cell where the hit belongs, see note on neighbouring cells in the class header.

Implements Topology.

Definition at line 65 of file DTTopology.cc.

References theFirstChannel, theLength, theOffSet, theWidth, PV2DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::x(), PV2DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::y().

{
  return MeasurementPoint( static_cast<int>( (lp.x()-theOffSet.x())/theWidth + theFirstChannel),
                           1 - (lp.y()-theOffSet.y())/theLength);
}

DTTopology::Side DTTopology::onWhichBorder	(	float	x,
		float	y,
		float	z
	)		const

Returns the side of the cell in which resides the point (x,y,z) (new cell geometry, i.e. with I-beam profiles).

Definition at line 109 of file DTTopology.cc.

References geometryDiff::epsilon, IBeamWingLength, IBeamWingThickness, none, sensibleHeight(), sensibleWidth(), xMax, xMin, zMax, and zMin.

Referenced by DTDigitizer::computeTime(), DTDigitizer::dumpHit(), and DTHitAssociator::SimHitOK().

{
  
  // epsilon = Tolerance to determine if a hit starts/ends on the cell border.
  // Current value comes from CMSIM, where hit position is
  // always ~10um far from surface. For OSCAR the discrepancy is < 1um.
  const float epsilon = 0.0015; // 15 um
  
  // with new geometry the cell shape is not rectangular, but is a
  // rectangular with the I-beam "Wing" subtracted.
  // The height of the Wing is 1.0 mm and the length is 6.35 mm: these 4
  // volumens must be taken into account when the border is computed
   
  Side side = none;
  
  if ( fabs(z) > ( sensibleHeight()/2.-epsilon) ||
       (fabs(x) > ( sensibleWidth()/2.-IBeamWingLength-epsilon) &&
        fabs(z) > ( sensibleHeight()/2.-IBeamWingThickness-epsilon) ) ){ //FIXME 

    if (z > 0.) side = zMax; // This is currently the INNER surface.
    else side = zMin;
  }
  
  else if ( fabs(x) > ( sensibleWidth()/2.-epsilon) ){ 
    if (x > 0.) side = xMax;
    else side = xMin;
  }   // FIXME: else if ymax, ymin...

  return side;
}

DTTopology::Side DTTopology::onWhichBorder_old	(	float	x,
		float	y,
		float	z
	)		const

Returns the side of the cell in which resides the point (x,y,z) (old cell geometry).

Definition at line 143 of file DTTopology.cc.

References geometryDiff::epsilon, none, sensibleHeight(), sensibleWidth(), xMax, xMin, zMax, and zMin.

{

  // epsilon = Tolerance to determine if a hit starts/ends on the cell border.
  // Current value comes from CMSIM, where hit position is
  // always ~10um far from surface. For OSCAR the discrepancy is < 1um.
  const float epsilon = 0.0015; // 15 um

  Side side = none;

  if ( fabs(z) > ( sensibleHeight()/2.-epsilon)) {
    if (z > 0.) { 
      side = zMax; // This is currently the INNER surface.
    } else {
      side = zMin;
    }
  } else if ( fabs(x) > ( sensibleWidth()/2.-epsilon)) {
    if (x > 0.) {
      side = xMax; 
    } else {
      side = xMin;
    }
  }   // FIXME: else if ymax, ymin...
  
  return side;
}

float DTTopology::sensibleHeight

(

)

const

Returns the height of the actual sensible volume of the cell.

Definition at line 45 of file DTTopology.cc.

References plateThickness, and theHeight.

Referenced by onWhichBorder(), and onWhichBorder_old().

{
  return theHeight-plateThickness;
}

float DTTopology::sensibleWidth

(

)

const

Returns the width of the actual sensible volume of the cell.

Definition at line 39 of file DTTopology.cc.

References IBeamThickness, and theWidth.

Referenced by onWhichBorder(), and onWhichBorder_old().

{
  return theWidth-IBeamThickness;
}

float DTTopology::wirePosition

(

int

wireNumber

)

const

Returns the x position in the layer of a given wire number.

Definition at line 86 of file DTTopology.cc.

References edm::hlt::Exception, isWireValid(), lastChannel(), theFirstChannel, theOffSet, theWidth, and PV2DBase< T, PVType, FrameType >::x().

Referenced by DTResolutionAnalysisTask::analyze(), DTSegmentUpdator::calculateT0corr(), DTRecHitSegmentResidual::compute(), DTLinearDriftAlgo::compute(), DTLinearDriftFromDBAlgo::compute(), DTNoDriftAlgo::compute(), DTCalibValidation::compute(), DTDigitizer::computeTime(), DTDigiSyncTOFCorr::digitizerOffset(), DTSegmentUpdator::fit(), DTTrigGeom::getGeom(), DTTMax::InfoLayer::InfoLayer(), DTClusterer::initHits(), DTTrigGeom::localPosition(), DTTTrigSyncFromDB::offset(), DTTTrigSyncTOFCorr::offset(), DTLocalTriggerBaseTest::phiRange(), DTCalibValidation::recHitDistFromWire(), DTRecHitQuality::recHitDistFromWire(), GlobalRecHitsAnalyzer::recHitDistFromWire(), GlobalRecHitsProducer::recHitDistFromWire(), DTResidualCalibration::segmentToWireDistance(), DTRecHitQuality::simHitDistFromWire(), GlobalRecHitsAnalyzer::simHitDistFromWire(), GlobalRecHitsProducer::simHitDistFromWire(), DTHitAssociator::SimHitOK(), DTTrigGeom::tubePosInCh(), DTSegmentUpdator::updateHits(), and ValidateGeometry::validateDTLayerGeometry().

{
  if (!isWireValid( wireNumber ))//- (theFirstChannel-1) <= 0. || wireNumber > lastChannel() )
    throw cms::Exception("InvalidWireNumber") << "DTTopology::wirePosition:" 
                          << " Requested wire number: "<< wireNumber 
                          << " ,but the first wire number is "<< theFirstChannel
                          << " and the last wire number is "<< lastChannel()
                          << std::endl;
  else
    return  (wireNumber - (theFirstChannel-1) - 0.5)*theWidth + theOffSet.x();
}

Member Data Documentation

const float DTTopology::IBeamThickness = 0.13

staticprivate

Definition at line 107 of file DTTopology.h.

Referenced by sensibleWidth().

const float DTTopology::IBeamWingLength = 0.635

staticprivate

Definition at line 105 of file DTTopology.h.

Referenced by onWhichBorder().

const float DTTopology::IBeamWingThickness = 0.13

staticprivate

Definition at line 104 of file DTTopology.h.

Referenced by onWhichBorder().

const float DTTopology::plateThickness = 0.15

staticprivate

Definition at line 106 of file DTTopology.h.

Referenced by sensibleHeight().

int DTTopology::theFirstChannel

private

Definition at line 97 of file DTTopology.h.

Referenced by channel(), DTTopology(), firstChannel(), isWireValid(), lastChannel(), localPosition(), measurementPosition(), and wirePosition().

const float DTTopology::theHeight = 1.3

staticprivate

Definition at line 101 of file DTTopology.h.

Referenced by cellHeight(), DTTopology(), and sensibleHeight().

float DTTopology::theLength

private

Definition at line 102 of file DTTopology.h.

Referenced by cellLenght(), DTTopology(), localError(), localPosition(), measurementError(), and measurementPosition().

int DTTopology::theNChannels

private

Definition at line 98 of file DTTopology.h.

Referenced by channels(), DTTopology(), and lastChannel().

Local2DPoint DTTopology::theOffSet

private

Definition at line 109 of file DTTopology.h.

Referenced by channel(), DTTopology(), localPosition(), measurementPosition(), and wirePosition().

const float DTTopology::theWidth = 4.2

staticprivate

Definition at line 100 of file DTTopology.h.

Referenced by cellWidth(), channel(), DTTopology(), localError(), localPosition(), measurementError(), measurementPosition(), sensibleWidth(), and wirePosition().