#include <DTTTrigSyncTOFCorr.h>

Inheritance diagram for DTTTrigSyncTOFCorr:

Public Member Functions
	DTTTrigSyncTOFCorr (const edm::ParameterSet &config)
	Constructor. More...

double	emulatorOffset (const DTWireId &wireId, double &tTrig, double &t0cell) const override

double	offset (const DTLayer *layer, const DTWireId &wireId, const GlobalPoint &globPos, double &tTrig, double &wirePropCorr, double &tofCorr) const override

double	offset (const DTWireId &wireId) const override

void	setES (const edm::EventSetup &setup) override
	Pass the Event Setup to the algo at each event. More...

	~DTTTrigSyncTOFCorr () override
	Destructor. More...

Public Member Functions inherited from DTTTrigBaseSync
	DTTTrigBaseSync ()
	Constructor. More...

virtual double	emulatorOffset (const DTWireId &wireId) const

double	offset (const DTLayer *layer, const DTWireId &wireId, const GlobalPoint &globalPos) const

virtual	~DTTTrigBaseSync ()
	Destructor. More...

Private Attributes
const bool	debug

double	theBXspace

const int	theTOFCorrType

const double	theTTrig

const double	theVPropWire

Detailed Description

Concrete implementation of a DTTTrigBaseSync. 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:

tTrig is a fixed offset defined in tTrig parameter (default 500 ns)
wirePropCorr is the correction for the signal propagation along the wire
tofCorr is the correction for the TOF of the particle set according to tofCorrType parameter:
0: tofCorrType = TOF from IP to 3D Hit position (globPos)
1: tofCorrType = TOF correction for distance difference between 3D center of the chamber and hit position
2: tofCorrType = TOF correction for distance difference between 3D center of the wire and hit position (This mode in available for backward compatibility)

The emulatorOffset is computed as:
offset = int(ttrig/BXspace)*BXspace
where:

ttrig from the fit of time box rising edge (taken from configuration, it is assumed to be in ns)
BXspace BX spacing (in ns). Taken from configuration (default 25ns).

NOTE: this should approximate what is seen online by the BTI

Author: G. Cerminara - INFN Torino

Definition at line 48 of file DTTTrigSyncTOFCorr.h.

Constructor & Destructor Documentation

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

Constructor.

Definition at line 18 of file DTTTrigSyncTOFCorr.cc.

     :                                                  // The fixed t0 (or t_trig) to be subtracted to digi time (ns)
       theTTrig(config.getParameter<double>("tTrig")),  // FIXME: Default was 500 ns
       // Velocity of signal propagation along the wire (cm/ns)
       theVPropWire(config.getParameter<double>("vPropWire")),  // FIXME: Default was 24.4 cm/ns
       // Select the mode for TOF correction:
       //     0: tofCorr = TOF from IP to 3D Hit position (globPos)
       //     1: tofCorr = TOF correction for distance difference
       //                  between 3D center of the chamber and hit position
       //                  (default)
       //     2: tofCorr = TOF correction for distance difference
       //                  between 3D center of the wire and hit position
       //                  (This mode in available for backward compatibility)
       theTOFCorrType(config.getParameter<int>("tofCorrType")),  // FIXME: Default was 1
       debug(config.getUntrackedParameter<bool>("debug")),
       theBXspace(config.getUntrackedParameter<double>("bxSpace", 25.))  // spacing of BX in ns
 {}

DTTTrigSyncTOFCorr::~DTTTrigSyncTOFCorr ( )

override

Destructor.

Definition at line 36 of file DTTTrigSyncTOFCorr.cc.

36 {}

Member Function Documentation

double DTTTrigSyncTOFCorr::emulatorOffset	(	const DTWireId &	wireId,
		double &	tTrig,
		double &	t0cell
	)		const

overridevirtual

Time (ns) to be subtracted to the digi time for emulation purposes It does not take into account TOF and signal propagation along the wire It also returns the different contributions separately:

tTrig is the offset (t_trig)
t0cell is the t0 from pulses (always 0 in this case)

Implements DTTTrigBaseSync.

Definition at line 109 of file DTTTrigSyncTOFCorr.cc.

References createfilelist::int, theBXspace, and theTTrig.

                                                                                                      {
   tTrig = theTTrig;
   t0cell = 0.;
 
   return int(tTrig / theBXspace) * theBXspace;
 }

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

overridevirtual

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 38 of file DTTTrigSyncTOFCorr.cc.

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

                                                          {
   tTrig = offset(wireId);
 
   //Compute the time spent in signal propagation along wire.
   // NOTE: the FE is always at y>0
   float halfL = layer->specificTopology().cellLenght() / 2;
   float wireCoord = layer->toLocal(globPos).y();
   float propgL = halfL - wireCoord;
   wirePropCorr = propgL / theVPropWire;
 
   // Compute TOF correction treating it accordingly to
   // the tofCorrType card
   float flightToHit = globPos.mag();
   static const float cSpeed = 29.9792458;  // cm/ns
   tofCorr = 0.;
   switch (theTOFCorrType) {
     case 0: {
       // In this mode the subtraction of the TOF from IP to
       // estimate 3D hit digi position is done here
       // (No correction is needed anymore)
       tofCorr = -flightToHit / cSpeed;
       break;
     }
     case 1: {
       // Correction for TOF from the center of the chamber to hit position
       const DTChamber* chamber = layer->chamber();
       double flightToChamber = chamber->surface().position().mag();
       tofCorr = (flightToChamber - flightToHit) / cSpeed;
       break;
     }
     case 2: {
       // TOF from 3D center of the wire to hit position
       float flightToWire =
           layer->toGlobal(LocalPoint(layer->specificTopology().wirePosition(wireId.wire()), 0., 0.)).mag();
       tofCorr = (flightToWire - flightToHit) / cSpeed;
       break;
     }
     default: {
       throw cms::Exception("[DTTTrigSyncTOFCorr]")
           << " Invalid parameter: tofCorrType = " << theTOFCorrType << std::endl;
       break;
     }
   }
 
   if (debug) {
     cout << "[DTTTrigSyncTOFCorr] Offset (ns): " << tTrig + wirePropCorr - tofCorr << endl
          << "      various contributions are: " << endl
          << "      tTrig (ns):   " << tTrig << endl
          << "      Propagation along wire delay (ns): " << wirePropCorr << endl
          << "      TOF correction (ns): " << tofCorr << endl
          << endl;
   }
   //The global offset is the sum of various contributions
   return tTrig + wirePropCorr - tofCorr;
 }

double DTTTrigSyncTOFCorr::offset ( const DTWireId & wireId ) const

overridevirtual

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.

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