marlintpc::MokkaToVoxelProcessor Class Reference

The MokkaToVoxelProcessor is a fast digitisation processor. More...

#include <MokkaToVoxelProcessor.h>

Inheritance diagram for marlintpc::MokkaToVoxelProcessor:

Public Member Functions
virtual Processor *	newProcessor ()
	MokkaToVoxelProcessor ()
	C'tor.
virtual	~MokkaToVoxelProcessor ()
	D'tor.
virtual void	init ()
	Called at the begin of the job before anything is read. More...
virtual void	processRunHeader (lcio::LCRunHeader *run)
	Called for every run.
virtual void	processEvent (lcio::LCEvent *evt)
	Called for every event - the working horse.
virtual void	check (lcio::LCEvent *evt)
virtual void	end ()
	Called after data processing for clean up.

Protected Attributes
std::string	_inputCollectionName
	Name of input collection.
std::string	_outputCollectionName
	Name of output collection.
std::string	_negativeOutputCollectionName
	Name of output collection for the negative half TPC.
std::string	_conditionsColName
	Name of collection with conditions data.
marlintpc::VoxelTPC *	_MokkaHitsInVoxelTPC_positive
marlintpc::VoxelTPC *	_MokkaHitsInVoxelTPC_negative
gear::PadRowLayout2D const *	_padLayout
int	_transient
	If not 0 output collection is set transient.
double	_ionisationEnergy
	Ionisation energy of the gas.
double	_readoutFrequency
	Frequency of the readout electronics.
double	_amplification
	Total amplification of primary electrons.
double	_diffTrans
	Transversal diffusion coefficient, comes from TPCConditions or as processor parameter.
double	_diffLong
	Longitudinal diffusion coefficient, comes from TPCConditions or as processor parameter.
double	_defocusTrans
	Transversal defocussing, comes from TPCConditions or as processor parameter.
double	_vDrift
	Electron drift velocity, comes from TPCConditions or as processor parameter.
double	_sigmaElectronics
	Charge broadening due to electronics shaping, which is assumed to be Gaussian.
double	_zAnode
	The z position of the anode (edge of the readout terminating the drift volume)

Detailed Description

The MokkaToVoxelProcessor is a fast digitisation processor.

It takes hits from Mokka simulations for input and does the whole digitisation in the TPC in one step. The energy deposition of the Mokka hit is transformed into the corresponding charge. The charge is then multiplied by a user given amplification factor. The broadening of the amplified charges is calculated from transverse diffusion and transverse defocussing. The time binning of the TPCVoxels is done by the frequency of the readout electronics. The broadening of the charge in longitudinal direction is done by the longitudinal diffusion and width of the electronics shaping, which is assumed to be gaussian. No event overlay is done.

Input - Prerequisites

• A Collection of SimTrackerHits (from Mokka)
• GEAR TPCParameters with a pad layout and maximum drift length
• tpcconddata::TPCConditions for the drift velocity, transverse diffusion and transverse defocussing

Output

A collection of TPCVoxel which contain charges detected on the corresponding pad at the corresponding time

Parameters

InputCollectionName	Name of input SimTrackerHit collection (default: MokkaHits)
OutputCollectionName	Name of output TPCVoxel collection (default: MokkaHitsInVoxels)
TPCConditionsCollection	Name of the input collection containing the TPC conditions data (default: TPCConditions::getDefaultColName())
Transient	If not 0 the output collection is set transient (default: 0)
ReadoutFrequency	Frequency of readout electronics in [MHz] (default: 40)
Amplification	Total amplification factor of primary electrons (default: 1)
IonisationEnergy	Mean ionisation energy of the chambers gas in [GeV] (default: 26E-9 (argon))
SigmaElectronics	Width of the electronics shaping, which is assumed to be gaussian (default: 0)

Author

Thorsten Krautscheid, University of Bonn

Martin Killenberg, CERN

Member Function Documentation

void marlintpc::MokkaToVoxelProcessor::init ( )

virtual

Called at the begin of the job before anything is read.

Use to initialize the processor, e.g. book histograms.

References _readoutFrequency, and _zAnode.

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

• MokkaToVoxelProcessor.h
• MokkaToVoxelProcessor.cc