o2::tpc::ElectronTransport Class Reference

#include <ElectronTransport.h>

Public Member Functions
	~ElectronTransport ()=default
	Destructor.
void	updateParameters (float vdrift=0)
	Update the OCDB parameters cached in the class. To be called once per event.
GlobalPosition3D	getElectronDrift (GlobalPosition3D posEle, float &driftTime)
bool	isCompletelyOutOfSectorCoarseElectronDrift (GlobalPosition3D posEle, const Sector &sector) const
bool	isElectronAttachment (float driftTime)
float	getDriftTime (float zPos, float signChange=1.f) const

Static Public Member Functions
static ElectronTransport &	instance ()

Detailed Description

This class handles the electron transport in the active volume of the TPC. In particular, in deals with the diffusion of the charge cloud while drifting towards the readout chambers and the loss of electrons during that drift due to attachement.

Definition at line 35 of file ElectronTransport.h.

Constructor & Destructor Documentation

~ElectronTransport()

o2::tpc::ElectronTransport::~ElectronTransport ( )

default

Destructor.

Member Function Documentation

getDriftTime()

float o2::tpc::ElectronTransport::getDriftTime ( float  zPos, float  signChange = 1.f  ) const

inline

Compute electron drift time from z position

Parameters

zPos	z position of the charge
signChange	If the zPosition of the charge is shifted to the other TPC side, the drift length needs to be accordingly longer. In such cases, this parameter is set to -1

Returns

Time of the charge

Definition at line 96 of file ElectronTransport.h.

getElectronDrift()

GlobalPosition3D ElectronTransport::getElectronDrift	(	GlobalPosition3D	posEle,
		float &	driftTime
	)

Drift of electrons in electric field taking into account diffusion

Parameters

posEle

GlobalPosition3D with start position of the electrons

Returns

driftTime Drift time taking into account diffusion in z direction

GlobalPosition3D with position of the electrons after the drift taking into account diffusion

For drift lengths shorter than 1 mm, the drift length is set to that value

The position is smeared by a Gaussian with mean around the actual position and a width according to the diffusion coefficient times sqrt(drift length)

If there is a sign change in the z position, the hit has changed sides This is not possible, but rather just an elongation of the drift time. In such cases, the old z position of the hit is returned, and the drift time is computed accordingly

Definition at line 36 of file ElectronTransport.cxx.

instance()

static ElectronTransport & o2::tpc::ElectronTransport::instance ( )

inlinestatic

Definition at line 38 of file ElectronTransport.h.

isCompletelyOutOfSectorCoarseElectronDrift()

bool ElectronTransport::isCompletelyOutOfSectorCoarseElectronDrift	(	GlobalPosition3D	posEle,
		const Sector &	sector
	)		const

Drift of electrons in electric field taking into account diffusion with 3 sigma of the width

Parameters

posEle

GlobalPosition3D with start position of the electrons

Returns

GlobalPosition3D with position of the electrons after the drift taking into account diffusion with 3 sigma of the width

For drift lengths shorter than 1 mm, the drift length is set to that value

Three sigma of the expected average transverse diffusion

Definition at line 68 of file ElectronTransport.cxx.

isElectronAttachment()

bool o2::tpc::ElectronTransport::isElectronAttachment ( float  driftTime )

inline

Attachment probability for a given drift time

Parameters

driftTime

Drift time of the electron

Returns

Boolean whether the electron is attached (and lost) or not

electron is attached and lost

not attached

Definition at line 87 of file ElectronTransport.h.

updateParameters()

void ElectronTransport::updateParameters

(

float

vdrift = 0

)

Update the OCDB parameters cached in the class. To be called once per event.

Definition at line 29 of file ElectronTransport.cxx.

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

• /home/runner/work/AliceO2/AliceO2/Detectors/TPC/simulation/include/TPCSimulation/ElectronTransport.h
• /home/runner/work/AliceO2/AliceO2/Detectors/TPC/simulation/src/ElectronTransport.cxx