CMSSW Reference Manual

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Public Member Functions
	DTTTrigSyncTOFCorr (const edm::ParameterSet &config)
	Constructor.
virtual double	offset (const DTWireId &wireId)
	Time (ns) to be subtracted to the digi time.
virtual double	offset (const DTLayer *layer, const DTWireId &wireId, const GlobalPoint &globPos, double &tTrig, double &wirePropCorr, double &tofCorr)
	Time (ns) to be subtracted to the digi time, Parameters are the layer and the wireId to which the digi is referred and the estimation of the 3D hit position (globPos) It also returns the different contributions separately: tTrig is the offset (t_trig) wirePropCorr is the delay for signal propagation along the wire tofCorr is the correction due to the particle TOF.
virtual void	setES (const edm::EventSetup &setup)
	Pass the Event Setup to the algo at each event.
virtual	~DTTTrigSyncTOFCorr ()
	Destructor.
Static Private Attributes
static bool	debug
static int	theTOFCorrType
static double	theTTrig
static double	theVPropWire

Detailed Description

This class define the offsets for RecHit building coherently to the digitization realized with the DTDigiSyncTOFCorr module. The offset is computes as:
offset = tTrig + wirePropCorr - tofCorr
where:

Constructor & Destructor Documentation

DTTTrigSyncTOFCorr::DTTTrigSyncTOFCorr ( const edm::ParameterSet & config )

Constructor.

Definition at line 21 of file DTTTrigSyncTOFCorr.cc.

References debug, edm::ParameterSet::getParameter(), edm::ParameterSet::getUntrackedParameter(), theTOFCorrType, theTTrig, and theVPropWire.

00021                                                                    {
00022   theTTrig = config.getParameter<double>("tTrig"); // FIXME: Default was 500 ns
00023   theVPropWire = config.getParameter<double>("vPropWire"); // FIXME: Default was 24.4 cm/ns
00024   theTOFCorrType = config.getParameter<int>("tofCorrType"); // FIXME: Default was 1
00025   debug = config.getUntrackedParameter<bool>("debug");
00026 
00027 }

DTTTrigSyncTOFCorr::~DTTTrigSyncTOFCorr ( ) [virtual]

Destructor.

Definition at line 31 of file DTTTrigSyncTOFCorr.cc.

00031 {}

Member Function Documentation

double DTTTrigSyncTOFCorr::offset ( const DTWireId & wireId ) [virtual]

Time (ns) to be subtracted to the digi time.

It does not take into account TOF and signal propagation along the wire

Implements DTTTrigBaseSync.

Definition at line 99 of file DTTTrigSyncTOFCorr.cc.

References theTTrig.

00099                                                         {
00100   // Correction for the float to int conversion
00101   // (half a bin on average) in DTDigi constructor
00102   static const float f2i_convCorr = (25./64.); // ns
00103   //FIXME: This should be considered only if the Digi is constructed from a float....
00104 
00105 
00106   // The tTrig is taken from a parameter
00107   return theTTrig - f2i_convCorr;
00108 }

double DTTTrigSyncTOFCorr::offset	(	const DTLayer *	layer,
		const DTWireId &	wireId,
		const GlobalPoint &	globPos,
		double &	tTrig,
		double &	wirePropCorr,
		double &	tofCorr
	)			`[virtual]`

Time (ns) to be subtracted to the digi time, Parameters are the layer and the wireId to which the digi is referred and the estimation of the 3D hit position (globPos) It also returns the different contributions separately:

tTrig is the offset (t_trig)
wirePropCorr is the delay for signal propagation along the wire
tofCorr is the correction due to the particle TOF.

Implements DTTTrigBaseSync.

Definition at line 35 of file DTTTrigSyncTOFCorr.cc.

References DTTopology::cellLenght(), DTLayer::chamber(), GenMuonPlsPt100GeV_cfg::cout, debug, lat::endl(), Exception, PV3DBase< T, PVType, FrameType >::mag(), muonGeometry::mag(), GloballyPositioned< T >::position(), DTLayer::specificTopology(), GeomDet::surface(), theTOFCorrType, theVPropWire, GeomDet::toGlobal(), GeomDet::toLocal(), DTWireId::wire(), DTTopology::wirePosition(), and PV3DBase< T, PVType, FrameType >::y().

00040                                                    {
00041   tTrig = offset(wireId);
00042 
00043   //Compute the time spent in signal propagation along wire.
00044   // NOTE: the FE is always at y>0
00045   float halfL     = layer->specificTopology().cellLenght()/2;
00046   float wireCoord = layer->toLocal(globPos).y();
00047   float propgL    = halfL - wireCoord;
00048   wirePropCorr = propgL/theVPropWire;
00049 
00050 
00051   // Compute TOF correction treating it accordingly to
00052   // the tofCorrType card
00053   float flightToHit = globPos.mag();
00054   static const float cSpeed = 29.9792458; // cm/ns
00055   tofCorr = 0.;
00056   switch(theTOFCorrType) {
00057   case 0: {
00058     // In this mode the subtraction of the TOF from IP to
00059     // estimate 3D hit digi position is done here
00060     // (No correction is needed anymore)
00061     tofCorr = -flightToHit/cSpeed;
00062     break;
00063   }
00064   case 1: {
00065     // Correction for TOF from the center of the chamber to hit position
00066     const DTChamber * chamber = layer->chamber();
00067     double flightToChamber = chamber->surface().position().mag();
00068     tofCorr = (flightToChamber-flightToHit)/cSpeed;
00069     break;
00070   }
00071   case 2: {
00072     // TOF from 3D center of the wire to hit position
00073     float flightToWire =
00074       layer->toGlobal(LocalPoint(layer->specificTopology().wirePosition(wireId.wire()), 0., 0.)).mag();
00075     tofCorr = (flightToWire-flightToHit)/cSpeed;
00076     break;
00077   }
00078   default: {
00079     throw
00080       cms::Exception("[DTTTrigSyncTOFCorr]") << " Invalid parameter: tofCorrType = "
00081                                              << theTOFCorrType 
00082                                              << std::endl;
00083     break;
00084   }
00085   }
00086 
00087   if(debug) {
00088     cout << "[DTTTrigSyncTOFCorr] Offset (ns): " << tTrig + wirePropCorr - tofCorr << endl
00089          << "      various contributions are: " << endl
00090          << "      tTrig (ns):   " << tTrig << endl
00091          << "      Propagation along wire delay (ns): " <<  wirePropCorr << endl
00092          << "      TOF correction (ns): " << tofCorr << endl
00093          << endl;
00094   }
00095   //The global offset is the sum of various contributions
00096   return tTrig + wirePropCorr - tofCorr;
00097 }

DTTTrigSyncTOFCorr Class Reference

Public Member Functions

Static Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation