#include "OpDetBacktrackerRecord.h"

Public Types
typedef int	TrackID_t
	Type of track ID (the value comes from Geant4) More...

Public Member Functions
	SDP ()
	Default constructor (sets "bogus" values) More...

	SDP (SDP const &sdp, int offset)
	Constructor: copies an SDP, and applies the specified offset to track ID. More...

	SDP (TrackID_t tid, float nPh, float e, float xpos, float ypos, float zpos)
	Constructor: sets all data members. More...

Public Attributes
TrackID_t	trackID
	Geant4 supplied track ID. More...

float	numPhotons
	number of photons at the optical detector for this track ID and time More...

float	energy
	energy deposited by ionization More...

float	x
	x position of ionization [cm] More...

float	y
	y position of ionization [cm] More...

float	z
	z position of ionization [cm] More...

Detailed Description

This class stores information about the Scintillation Light from the simulation of a small step of a track through the TPC active volume.

Scintillation information consists of both energy and number of photons. It is of paramount importance to understand what each field stores:

position: where the scintillation occurred (from Geant4 simulation)
track ID: Geant4 track ID of the ionizing particle
energy: amount of energy in G4Step (from Geant4 simulation)
photons: amount of photons reaching the optical detector

Note the different definition of the photons respect to the rest: it describes the photons at the OpticlaDetector, while all the other quantities can be related to the moment the scintillation happened.

The number of photons is the result of the OpFastScintillation sim, so no real photons are simulated.

Each SDP is also typically associated with a time (timePDclock) count, that is the time at which the scintillation photons are generated, as drift time is assumed to be zero for the photons. This time will differ from the time reflected in recob::OpHits as the time stored does not account for any signal processing time. The backtracker will handle that with a FCL parameter called Delay. Each experiment will have to determine the correct Delay to use with their system. For dune10KT the delay is ~300 ns.

The SDP (Scintillation Deposited Photons) records are generated in OpFastScintillation.cxx.

Definition at line 70 of file OpDetBacktrackerRecord.h.

Member Typedef Documentation

typedef int sim::SDP::TrackID_t

Type of track ID (the value comes from Geant4)

Definition at line 73 of file OpDetBacktrackerRecord.h.

Constructor & Destructor Documentation

sim::SDP::SDP ( )

Default constructor (sets "bogus" values)

Definition at line 26 of file OpDetBacktrackerRecord.cxx.

     : trackID     (util::kBogusI)
     , numPhotons  (util::kBogusD)
     , energy      (util::kBogusD)
     , x           (util::kBogusD)
     , y                 (util::kBogusD)
     , z                 (util::kBogusD)
   {}

sim::SDP::SDP	(	sim::SDP const &	sdp,
		int	offset
	)

Constructor: copies an SDP, and applies the specified offset to track ID.

Definition at line 36 of file OpDetBacktrackerRecord.cxx.

References trackID.

     : SDP(sdp)
   {
     trackID += offset;
   }

sim::SDP::SDP	(	TrackID_t	tid,
		float	nPh,
		float	e,
		float	xpos,
		float	ypos,
		float	zpos
	)

inline

Constructor: sets all data members.

Definition at line 83 of file OpDetBacktrackerRecord.h.

     : trackID     (tid)
     , numPhotons  (nPh)
     , energy      (e)
     , x           (xpos)
     , y           (ypos)
     , z           (zpos)
     {}