Trk::MaterialProperties Class Reference

Material with information about thickness of material. More...

#include <MaterialProperties.h>

Collaboration diagram for Trk::MaterialProperties:

Public Member Functions
	MaterialProperties ()=default
	Default Constructor.
	MaterialProperties (const MaterialProperties &mprop)=default
	Copy Constructor.
MaterialProperties &	operator= (const MaterialProperties &mprop)=default
	Assignment Operator.
	MaterialProperties (MaterialProperties &&mprop)=default
	Move Constructor.
MaterialProperties &	operator= (MaterialProperties &&mprop)=default
	Move Assignment Operator.
	~MaterialProperties ()=default
	Destructor.
	MaterialProperties (float path, float Xo, float Lo, float averageA, float averageZ, float averageRho, float dEdX=0.)
	Constructor - for averaged material.
	MaterialProperties (const Material &material, float path)
	Constructor - for full Material class.
MaterialProperties *	clone () const
	Pseudo-Constructor clone()
MaterialProperties &	operator*= (float scale)
	Scale operator - scales the material thickness.
const Material &	material () const
	Return the stored Material.
Material &	material ()
	Return the stored Material.
float	x0 () const
	Return the radiation length.
float	l0 () const
	Return the nuclear interaction length.
float	thickness () const
	Return the thickness in mm.
float	thicknessInX0 () const
	Return the radiationlength fraction.
float	thicknessInL0 () const
	Return the nuclear interaction length fraction.
float	averageZ () const
	Returns the average Z of the material.
float	averageA () const
	Return the average A of the material [gram/mole].
float	averageRho () const
	Return the average density of the material.
float	zOverAtimesRho () const
	Return the \( Z/A * rho \).
float	zOverAtimesRhoTimesD () const
	Return the \( d* Z/A * rho \).
float	dEdX () const
	Return method for \( dE/dX \).
void	addMaterial (const Material &mp, float dInX0)
	Material averaging.
void	setMaterial (const Material &mp, float thickness=1.)
	Set Material.

Protected Member Functions
void	setDeDx (float dEdX)
	Set dEdX - important for material calibarion.

Protected Attributes
Material	m_material
float	m_dInX0 = 0
	thickness in units of radiation length
float	m_dInL0 = 0
	thickness in units of nuclear interaction length
float	m_zOaTrTd
	\( \frac{Z}{A}\cdot\rho\cdot d \) - in ATLAS units

Friends
class	::MaterialPropertiesCnv_p1

Detailed Description

Material with information about thickness of material.

the units are :

• thickness [mm] ( only used for layer description)
• X0 [mm]
• L0 [mm]
• A [g/mole]
• Z
• rho [g/mm3]

The Trk::MaterialProperties describe material associated with a Trk::Layer

Author

Andre.nosp@m.as.S.nosp@m.alzbu.nosp@m.rger.nosp@m.@cern.nosp@m..ch

Definition at line 40 of file MaterialProperties.h.

Constructor & Destructor Documentation

MaterialProperties() [1/5]

Trk::MaterialProperties::MaterialProperties ( )

default

Default Constructor.

MaterialProperties() [2/5]

Trk::MaterialProperties::MaterialProperties ( const MaterialProperties & mprop )

default

Copy Constructor.

MaterialProperties() [3/5]

Trk::MaterialProperties::MaterialProperties ( MaterialProperties && mprop )

default

Move Constructor.

~MaterialProperties()

Trk::MaterialProperties::~MaterialProperties ( )

default

Destructor.

MaterialProperties() [4/5]

Trk::MaterialProperties::MaterialProperties	(	float	path,
		float	Xo,
		float	Lo,
		float	averageA,
		float	averageZ,
		float	averageRho,
		float	dEdX = 0. )

Constructor - for averaged material.

Definition at line 13 of file MaterialProperties.cxx.

    : m_material(Xo, Lo, averageA, averageZ, averageRho, dEdX),
      m_dInX0(Xo * Xo > 10e-10 ? path / Xo : 0.),
      m_dInL0(Lo * Lo > 10e-10 ? path / Lo : 0.),
      m_zOaTrTd(averageA * averageA > 10e-10
                    ? averageZ / averageA * averageRho * path
                    : 0.) {}

MaterialProperties() [5/5]

Trk::MaterialProperties::MaterialProperties	(	const Material &	material,
		float	path )

Constructor - for full Material class.

Definition at line 24 of file MaterialProperties.cxx.

    : m_material(material),
      m_dInX0(material.X0 * material.X0 > 10e-10 ? path / material.X0 : 0.),
      m_dInL0(material.L0 * material.L0 > 10e-10 ? path / material.L0 : 0.),
      m_zOaTrTd(material.A * material.A > 10e-10
                    ? path * material.Z / material.A * material.rho
                    : 0.) {}

Member Function Documentation

addMaterial()

void Trk::MaterialProperties::addMaterial	(	const Material &	mp,
		float	dInX0 )

Material averaging.

<

Todo

update ?

Definition at line 46 of file MaterialProperties.cxx.

                                                       {
  // averaging factors based on thickness
  float fnew = dInX0 * mat.X0 / (m_dInX0 * m_material.X0 + dInX0 * mat.X0);
  float fold = 1. - fnew;
 
  // updated material thickness
  m_dInX0 += dInX0;
 
  // updated material
  m_material = Trk::Material(1. / (fnew / mat.X0 + fold / m_material.X0),
                             1. / (fnew / mat.L0 + fold / m_material.L0),
                             fnew * mat.A + fold * m_material.A,
                             fnew * mat.Z + fold * m_material.Z,
                             fnew * mat.rho + fold * m_material.rho);
 
  // updated derived members
  m_dInL0 = m_dInX0 * m_material.X0 / m_material.L0;
  m_zOaTrTd = m_material.A > 0 ? m_dInX0 * m_material.X0 * m_material.Z /
                                     m_material.A * m_material.rho
                               : 0;
}

averageA()

float Trk::MaterialProperties::averageA

(

)

const

Return the average A of the material [gram/mole].

averageRho()

float Trk::MaterialProperties::averageRho

(

)

const

Return the average density of the material.

• in [g/mm^3]

averageZ()

float Trk::MaterialProperties::averageZ

(

)

const

Returns the average Z of the material.

clone()

Trk::MaterialProperties * Trk::MaterialProperties::clone

(

)

const

Pseudo-Constructor clone()

Definition at line 33 of file MaterialProperties.cxx.

                                                          {
  return new Trk::MaterialProperties(*this);
}

dEdX()

float Trk::MaterialProperties::dEdX

(

)

const

Return method for \( dE/dX \).

l0()

float Trk::MaterialProperties::l0

(

)

const

Return the nuclear interaction length.

material() [1/2]

Material & Trk::MaterialProperties::material

(

)

Return the stored Material.

material() [2/2]

const Material & Trk::MaterialProperties::material

(

)

const

Return the stored Material.

operator*=()

Trk::MaterialProperties & Trk::MaterialProperties::operator*=

(

float

scale

)

Scale operator - scales the material thickness.

Definition at line 37 of file MaterialProperties.cxx.

                                                                    {
  // assuming rescaling of the material thickness
  m_dInX0 *= scale;
  m_dInL0 *= scale;
  m_zOaTrTd *= scale;
 
  return (*this);
}

operator=() [1/2]

MaterialProperties & Trk::MaterialProperties::operator= ( const MaterialProperties & mprop )

default

Assignment Operator.

operator=() [2/2]

MaterialProperties & Trk::MaterialProperties::operator= ( MaterialProperties && mprop )

default

Move Assignment Operator.

setDeDx()

void Trk::MaterialProperties::setDeDx ( float dEdX )

protected

Set dEdX - important for material calibarion.

Definition at line 79 of file MaterialProperties.cxx.

                                              {
  // set the DE/DX value
  m_material.dEdX = dEdX;
}

setMaterial()

void Trk::MaterialProperties::setMaterial	(	const Material &	mp,
		float	thickness = 1. )

Set Material.

Definition at line 70 of file MaterialProperties.cxx.

                                                           {
  // just overwrite what you have
  m_material = mat;
  m_dInX0 = thickness / mat.X0;
  m_dInL0 = thickness / mat.L0;
  m_zOaTrTd = mat.Z / mat.A * mat.rho * thickness;
}

thickness()

float Trk::MaterialProperties::thickness

(

)

const

Return the thickness in mm.

thicknessInL0()

float Trk::MaterialProperties::thicknessInL0

(

)

const

Return the nuclear interaction length fraction.

thicknessInX0()

float Trk::MaterialProperties::thicknessInX0

(

)

const

Return the radiationlength fraction.

x0()

float Trk::MaterialProperties::x0

(

)

const

Return the radiation length.

zOverAtimesRho()

float Trk::MaterialProperties::zOverAtimesRho

(

)

const

Return the \( Z/A * rho \).

zOverAtimesRhoTimesD()

float Trk::MaterialProperties::zOverAtimesRhoTimesD

(

)

const

Return the \( d* Z/A * rho \).

Friends And Related Symbol Documentation

::MaterialPropertiesCnv_p1

friend class ::MaterialPropertiesCnv_p1

friend

Definition at line 116 of file MaterialProperties.h.

Member Data Documentation

m_dInL0

float Trk::MaterialProperties::m_dInL0 = 0

protected

thickness in units of nuclear interaction length

Definition at line 123 of file MaterialProperties.h.

m_dInX0

float Trk::MaterialProperties::m_dInX0 = 0

protected

thickness in units of radiation length

Definition at line 122 of file MaterialProperties.h.

m_material

Material Trk::MaterialProperties::m_material

protected

Definition at line 121 of file MaterialProperties.h.

m_zOaTrTd

float Trk::MaterialProperties::m_zOaTrTd

protected

Initial value:

=
      0

\( \frac{Z}{A}\cdot\rho\cdot d \) - in ATLAS units

Definition at line 124 of file MaterialProperties.h.

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

• MaterialProperties.h
• MaterialProperties.cxx