marlintpc::IonsInVoxelsProcessor Class Reference

This processor takes all ions from the primary ionisation and stores there charges in voxels. More...

#include <IonsInVoxelsProcessor.h>

Inheritance diagram for marlintpc::IonsInVoxelsProcessor:

Public Member Functions
virtual Processor *	newProcessor ()
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	end ()
	Write the root file and close it porperly.
int	getPad (gear::PadRowLayout2D const *padLayout, SimTrackerHit *hit)
	Function to get the pad corresponding to a hit for the different pad layouts.

Protected Member Functions
void	fillTree (LCCollectionVec *outputVoxelCollection)
	a helper function to avoid code duplication.

Protected Attributes
std::string	_inputIonsColName
std::string	_outputVoxelColName
gear::PadRowLayout2D const *	_padLayout
int	_padLayoutType
marlintpc::VoxelTPC *	_voxelTPC
bool	_outputIsPersistent
	Flag whether to write the output to disk.
int	_outputType
	Output type: event based or total.
int	_nEvt
double	_binLength
	Length of the zBins.
double	_ionisationEnergy
	The mean ionisation energy in the gas.
int	_writeAfterNEvents
	Only write after n events (and summ up until then)
std::string	_rootFileName
	Name of the file for the debug tree.
double	_maxDriftLength
std::vector< double >	_leaf_chargePerVolume
	the charge per volume in the voxel (in C/mm^2)
std::vector< int >	_leaf_charge
	charge per voxel
std::vector< int >	_leaf_padIndex
	the gear pad index
std::vector< int >	_leaf_zIndex
	the z index
std::vector< double >	_leaf_x
std::vector< double >	_leaf_y
std::vector< double >	_leaf_z
	the coordinates of the voxel centre
TTree *	_chargeInVoxelsTree
TFile *	_rootFile
bool	_useNegativeHalf

Detailed Description

This processor takes all ions from the primary ionisation and stores there charges in voxels.

The binning of the voxels is given in the x,y-plane by the pads of the readout plane. The length of the voxel in the z-direction can be chosen via the steering file. For storing and management of the voxels the helper class VoxelTPC is used. Output collections contain the charges of all the ions which emerged to the given event or all ions which appeared up to the given events in the TPC.

A root tree for debugging can be written out. This happens for every event if OutputType==0 or once at the end if OutputType==1. I case WriteAfterNEvents is turned on, the tree is also written after n events.

Input - Prerequisites

Collection of SimTrackerHits with charge values set as dEdx

Output

Collection containing the charges of the primary ions in TPCVoxels.

Parameters

InputCollectionName	Name of input collection, SimTrackerHits
OutputCollectionName	Name of output collection, TPCVoxel
WriteOutputToStorage	If true the output collection is written (default: true)
OutputType	If 0 only ions from one event are written, else all events are summed up (default 0)
BinLength	Length of the bins in z direction ( default: 2.5 mm)
IonisationEnergy	The energy in GeV needed to ionize a gas particle (default: 26.E-9 = Argon)
WriteAfterNEvents	Force readout of the full TPC after overlaying n events (optional) Forses the OutputType to 1
WriteRootFile	File name for a root tree with the charge per voxel for debugging (optional)
UseNegativeHalfTPC	Use the negative instead of the positive half TPC (default: false)

Author

Thorsten Krautscheid (University of Bonn)

Martin Killenberg (CERN)

Member Function Documentation

void marlintpc::IonsInVoxelsProcessor::init ( )

virtual

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

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

References _binLength, _leaf_charge, _leaf_chargePerVolume, _leaf_padIndex, _leaf_z, _leaf_zIndex, _outputType, and _rootFileName.

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

• IonsInVoxelsProcessor.h
• IonsInVoxelsProcessor.cc