#include <DTTopology.h>

Inheritance diagram for DTTopology:

Public Types
enum	Side { zMin, zMax, xMin, xMax, yMin, yMax, none }
	Sides of the cell. More...
Public Member Functions
const float	cellHeight () const
	Returns the cell height.
const float	cellLenght () const
const float	cellWidth () const
	Returns the cell width.
int	channel (const LocalPoint &p) const
const int	channels () const
	Returns the number of wires in the layer.
	DTTopology (int firstWire, int nChannels, float semilenght)
	Constructor: number of first wire, total # of wires in the layer and their lenght.
const int	firstChannel () const
	Returns the wire number of the first wire.
const bool	isWireValid (const int wireNumber) const
const int	lastChannel () const
	Returns the wire number of the last wire.
LocalError	localError (const MeasurementPoint &, const MeasurementError &) const
LocalPoint	localPosition (const MeasurementPoint &) const
MeasurementError	measurementError (const LocalPoint &, const LocalError &) const
	Conversion to the measurement frame.
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).
const float	sensibleHeight () const
	Returns the height of the actual sensible volume of the cell.
const float	sensibleWidth () const
	Returns the width of the actual sensible volume of the cell.
float	wirePosition (int wireNumber) const
	Returns the x position in the layer of a given wire number.
virtual	~DTTopology ()
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.

Date:: 2009/04/30 09:05:25

Revision:: 1.5

Author:: R. Bellan - INFN Torino

Definition at line 30 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 90 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 24 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 ( ) [inline, virtual]

Definition at line 36 of file DTTopology.h.

{}

Member Function Documentation

const float DTTopology::cellHeight ( ) const [inline]

Returns the cell height.

Definition at line 72 of file DTTopology.h.

References theHeight.

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

{return theHeight;}

const 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 75 of file DTTopology.h.

References theLength.

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

{return theLength;}

const float DTTopology::cellWidth ( ) const [inline]

Returns the cell width.

Definition at line 70 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 68 of file DTTopology.cc.

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

Referenced by MuonSimHitProducer::produce().

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

const int DTTopology::channels ( ) const [inline]

Returns the number of wires in the layer.

Definition at line 77 of file DTTopology.h.

References theNChannels.

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

{return theNChannels;}

const int DTTopology::firstChannel ( ) const [inline]

Returns the wire number of the first wire.

Definition at line 80 of file DTTopology.h.

References theFirstChannel.

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

{return theFirstChannel;}

const bool DTTopology::isWireValid ( const int wireNumber ) const [inline]

Definition at line 67 of file DTTopology.h.

References lastChannel(), and theFirstChannel.

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

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

const int DTTopology::lastChannel ( ) const [inline]

Returns the wire number of the last wire.

Definition at line 82 of file DTTopology.h.

References theFirstChannel, and theNChannels.

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

{return theNChannels+theFirstChannel-1;}

LocalError DTTopology::localError	(	const MeasurementPoint &	mp,
		const MeasurementError &	me
	)		const `[virtual]`

Conversion between measurement coordinates and local cartesian coordinates.

Implements Topology.

Definition at line 53 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 48 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 &	lp,
		const LocalError &	le
	)		const `[virtual]`

Conversion to the measurement frame.

Implements Topology.

Definition at line 63 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 58 of file DTTopology.cc.

References theFirstChannel, theLength, theOffSet, theWidth, PV3DBase< T, PVType, FrameType >::x(), PV2DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV2DBase< 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 94 of file DTTopology.cc.

References 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 126 of file DTTopology.cc.

References 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;
}

const float DTTopology::sensibleHeight ( ) const

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

Definition at line 44 of file DTTopology.cc.

References plateThickness, and theHeight.

Referenced by onWhichBorder(), and onWhichBorder_old().

                                            {
  return theHeight-plateThickness;
}

const float DTTopology::sensibleWidth ( ) const

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

Definition at line 40 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 73 of file DTTopology.cc.

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

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

                                                  {
  if (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();
}