DTTTrigSyncTOFCorr Class Reference

#include <DTTTrigSyncTOFCorr.h>

Inheritance diagram for DTTTrigSyncTOFCorr:

Public Member Functions
	DTTTrigSyncTOFCorr (const edm::ParameterSet &config)
	Constructor. More...
virtual double	emulatorOffset (const DTWireId &wireId, double &tTrig, double &t0cell)
virtual double	offset (const DTLayer *layer, const DTWireId &wireId, const GlobalPoint &globPos, double &tTrig, double &wirePropCorr, double &tofCorr)
virtual double	offset (const DTWireId &wireId)
virtual void	setES (const edm::EventSetup &setup)
	Pass the Event Setup to the algo at each event. More...
virtual	~DTTTrigSyncTOFCorr ()
	Destructor. More...
Public Member Functions inherited from DTTTrigBaseSync
	DTTTrigBaseSync ()
	Constructor. More...
virtual double	emulatorOffset (const DTWireId &wireId)
double	offset (const DTLayer *layer, const DTWireId &wireId, const GlobalPoint &globalPos)
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 50 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 ( )

virtual

Destructor.

Definition at line 40 of file DTTTrigSyncTOFCorr.cc.

{}

Member Function Documentation

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

virtual

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 120 of file DTTTrigSyncTOFCorr.cc.

References 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  )

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 44 of file DTTTrigSyncTOFCorr.cc.

References DTTopology::cellLenght(), DTLayer::chamber(), gather_cfg::cout, debug, edm::hlt::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 )

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 108 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;
}

virtual void DTTTrigSyncTOFCorr::setES ( const edm::EventSetup &  setup )

inlinevirtual

Pass the Event Setup to the algo at each event.

Implements DTTTrigBaseSync.

Definition at line 61 of file DTTTrigSyncTOFCorr.h.

{}

Member Data Documentation

const bool DTTTrigSyncTOFCorr::debug

private

Definition at line 108 of file DTTTrigSyncTOFCorr.h.

Referenced by pkg.AbstractPkg::generate(), pkg.AbstractPkg::get_kwds(), offset(), and pkg.AbstractPkg::write().

double DTTTrigSyncTOFCorr::theBXspace

private

Definition at line 110 of file DTTTrigSyncTOFCorr.h.

Referenced by emulatorOffset().

const int DTTTrigSyncTOFCorr::theTOFCorrType

private

Definition at line 105 of file DTTTrigSyncTOFCorr.h.

Referenced by offset().

const double DTTTrigSyncTOFCorr::theTTrig

private

Definition at line 92 of file DTTTrigSyncTOFCorr.h.

Referenced by emulatorOffset(), and offset().

const double DTTTrigSyncTOFCorr::theVPropWire

private

Definition at line 97 of file DTTTrigSyncTOFCorr.h.

Referenced by offset().