marlintpc::PadResponseFunctionGEM Class Reference

Functionality to evaluate the pad response function for a hit. More...

#include <PadResponseFunctionGEM.h>

Public Member Functions
	PadResponseFunctionGEM (double defocussing, double diffusion, const gear::TPCParameters &gearparameter)
	The constructor.
bool	EvaluateHit (lcio::TrackerHit *hit, lcio::Track *track=NULL)
	returns true if a PRF correction was applied, returns false if KeepCentreOfGravityInfo was used
double *	GetPRFPosition ()
	PRF improved position in global coordinates. PRF acts in rphi or xy not in z, so this is a 2D position in global coordinates.
double	GetPRFCharge ()
	Hit charge given by the integral of the PRF.
double	GetPRFChargeError ()
	Error on the hit charge.
bool	GetPRFSucceeded ()
	Option to check if the fit failed. A way to distinguish between the reseon the PRF was not used, either because enough pads or fit failed.
void	SetPRCOnly (int value)
	Option to check if the fit failed. A way to distinguish between the reseon the PRF was not used, either because enough pads or fit failed.

Protected Member Functions
void	CalculateFixedWidth (lcio::TrackerHit *hit, lcio::Track *track=NULL)
	Calculate the width to be fixed for the PRF fit from information from the hit and/or track based on a parametrisation.
void	PrepareHitData (lcio::TrackerHit *hit)
	prepare hit data, transfer info to fit object
void	FitPRF (lcio::TrackerHit *hit, bool fixCharge=false)
	Carry out the fit.
void	CalculatePRC (lcio::TrackerHit *hit)
	calculate only a position correction for the center of gravity based on parametrisation
void	KeepCentreOfGravityInfo (lcio::TrackerHit *hit)
	In case a PRF is not needed we keep the information of the original hit via the centre of gravity.

Protected Attributes
double	_defocussing
	First paramter for the parametrisation of expected width: diffusion within gem stack sigma_0^2 [mm^2].
double	_diffusion
	Second paramter for the parametrisation of expected width: diffusion in drift region D^2 [mm].
double	_fixedWidth
	width for the gaussian fit
double	_position
	position of the hit along the row in global coordinates
double	_positionRow
	position of the row of the hit in global coordinates, unaffected by PRF fit
double	_prfpos [2]
	position to give back
double	_positionRowLocal
	position of the row of the hit in local coordinates, unaffected by PRF fit
double	_charge
	charge of the hit as given by the integral
double	_chargeErr
bool	_status
	status of prf evaluation, true if fits have worked
bool	_fitOK
	status of prf fit
TGraph *	_graph
	object for fitting or calculation in local coordinates
double	_maxCharge
	max charge filled in graph
double	_maxPos
	max position in graph
double	_min
	range of graph
double	_max
const gear::TPCParameters &	_tpcParameters
	access to gear information
TF1 *	_PRFShift
	prf parametrisation for flat region
TF1 *	_PRF
	prf parametrisation
int	_PRConly
	Switch to disable the fitting, just do the calculation of a correction (like in MultiFit)

Detailed Description

Functionality to evaluate the pad response function for a hit.

This class is for GEM data where the PRF can be described as a gaussian. Goals are to improve the position of the hit, enable the correction of dead channels and channels in overrange.

Author

A.Muennich, DESY

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The documentation for this class was generated from the following files:

• PadResponseFunctionGEM.h
• PadResponseFunctionGEM.cc