#include <acts/blob/sPHENIX/Core/include/Acts/Material/AccumulatedMaterialSlab.hpp>

Collaboration diagram for Acts::AccumulatedMaterialSlab:

Public Member Functions
void	accumulate (MaterialSlab slabAlongTrack, float pathCorrection=1)

void	trackAverage (bool useEmptyTrack=false)

std::pair< MaterialSlab, unsigned int >	totalAverage () const

Private Attributes
MaterialSlab	m_trackAverage
	Averaged properties for a single track.

MaterialSlab	m_totalAverage
	Averaged properties over multiple tracks.

unsigned int	m_totalCount = 0u

Detailed Description

Accumulate material properties from multiple hits/track and multiple tracks.

This is a helper class for the SurfaceMaterialMapper to handle material accumulation and averaging for one surface bin. The accumulation procedure is done in two steps:

The per-track store accumulates material steps from one track/particle. Multiple material steps can be assigned to the same bin time by one particle, e.g. if the simulation has created more than one step in the material or if several components are compressed into one description. Multiple steps are treated as if they are passed one after the other.
The total store averages the accumulated material properties over all tracks. Each track contributes equally.

Definition at line 29 of file AccumulatedMaterialSlab.hpp.

View newest version in sPHENIX GitHub at line 29 of file AccumulatedMaterialSlab.hpp

Member Function Documentation

void Acts::AccumulatedMaterialSlab::accumulate	(	MaterialSlab	slabAlongTrack,
		float	pathCorrection = `1`
	)

Add the material to the current per-track store.

Parameters

slabAlongTrack	Recorded equivalent material slab for this step
pathCorrection	Correction factor due to non-perpendicular incident

The recoded material slab is assumed to be defined along the track direction. The track can have non-perpendicular incidence on the surface and the recorded slab has to be projected along the surface normal. The path correction gives the scaling factor from normal incidence to the recorded incidence as provided by the Surface interface.

Vacuum steps with a non-zero thickness can be added to account for holes in material structures.

Definition at line 13 of file AccumulatedMaterialSlab.cpp.

View newest version in sPHENIX GitHub at line 13 of file AccumulatedMaterialSlab.cpp

References Acts::detail::combineSlabs(), m_trackAverage, and Acts::MaterialSlab::scaleThickness().

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std::pair< Acts::MaterialSlab, unsigned int > Acts::AccumulatedMaterialSlab::totalAverage ( ) const

Return the average material properties from all accumulated tracks.

Returns: Average material properties and the number of contributing tracks

Only contains the information up to the last .trackAverage(...) call. If there have been additional calls to .accumulate(...) afterwards, the information is not part of the total average. The thickness corresponds to the average thickness seen by the tracks.

Definition at line 43 of file AccumulatedMaterialSlab.cpp.

View newest version in sPHENIX GitHub at line 43 of file AccumulatedMaterialSlab.cpp

void Acts::AccumulatedMaterialSlab::trackAverage ( bool useEmptyTrack = false )

Add the accumulated material for the current track to the total average.

Parameters

useEmptyTrack indicate whether to consider an empty track store

This finishes the material accumulation for the current track and resets the per-track store. Subsequent calls to .accumulate(...) will start accumulating material for a new track.

Each track contributes equally to the total average regardless of its measured path within the material. An empty per-track store, i.e. vanishing per-track material thickness, does not contribute to the total unless explicitely requested.

Definition at line 21 of file AccumulatedMaterialSlab.cpp.

View newest version in sPHENIX GitHub at line 21 of file AccumulatedMaterialSlab.cpp

References Acts::detail::combineSlabs(), and Acts::UnitConstants::u.

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