BmnSsdPhysics Class Reference

Auxiliary class for simulating physics processes in Silicon. More...

#include <BmnSsdPhysics.h>

Inheritance diagram for BmnSsdPhysics:

Collaboration diagram for BmnSsdPhysics:

Public Member Functions
virtual	~BmnSsdPhysics ()
Double_t	EnergyLoss (Double_t dz, Double_t mass, Double_t eKin, Double_t dedx) const
Double_t	LandauWidth (Double_t mostProbableCharge)
Double_t	StoppingPower (Double_t eKin, Int_t pid)
Double_t	StoppingPower (Double_t energy, Double_t mass, Double_t charge, Bool_t isElectron)

Static Public Member Functions
static Double_t	DiffusionWidth (Double_t z, Double_t d, Double_t vBias, Double_t vFd, Double_t temperature, Int_t chargeType)
static Double_t	ElectricField (Double_t vBias, Double_t vFd, Double_t dZ, Double_t z)
static Double_t	GetSiCharge ()
static BmnSsdPhysics *	Instance ()
static Double_t	PairCreationEnergy ()
static Double_t	ParticleCharge (Int_t pid)
static Double_t	ParticleMass (Int_t pid)

Detailed Description

Auxiliary class for simulating physics processes in Silicon.

Since

20.12.2018

Definition at line 20 of file BmnSsdPhysics.h.

Constructor & Destructor Documentation

~BmnSsdPhysics()

BmnSsdPhysics::~BmnSsdPhysics ( )

virtual

Destructor

Definition at line 58 of file BmnSsdPhysics.cxx.

Member Function Documentation

DiffusionWidth()

Double_t BmnSsdPhysics::DiffusionWidth ( Double_t  z, Double_t  d, Double_t  vBias, Double_t  vFd, Double_t  temperature, Int_t  chargeType  )

static

Diffusion width as function of z

Parameters

z	Distance from p side [cm]
d	Thickness of sensor [cm]
vBias	Bias voltage [V]
vFd	Full depletion voltage [V]
temperature	Temperature [K]
chargeType	0 = electron, 1 = hole @value Drift time [s]

Calculates the diffusion width (sigma) for a charge drifting from z to the readout (z = 0 for hole, z = d for electrons).

For the reference to the formulae, see the SSD digitiser note.

Definition at line 65 of file BmnSsdPhysics.cxx.

References d, log(), and sqrt().

Referenced by BmnSsdSensorDssdStereo::PropagateCharge().

ElectricField()

Double_t BmnSsdPhysics::ElectricField ( Double_t  vBias, Double_t  vFd, Double_t  dZ, Double_t  z  )

static

Electric field magnitude in a silicon sensor as function of z

Parameters

vBias	Bias voltage [V]
vFd	Full depletion voltage [V]
dZ	Thickness of sensor [cm]
z	z coordinate, measured from the p side [cm] @value z component of electric field [V/cm]

Definition at line 112 of file BmnSsdPhysics.cxx.

Referenced by BmnSsdSensorDssd::LorentzShift().

EnergyLoss()

Double_t BmnSsdPhysics::EnergyLoss	(	Double_t	dz,
		Double_t	mass,
		Double_t	eKin,
		Double_t	dedx
	)		const

Energy loss in a Silicon layer

Parameters

dz	Layer thickness [cm]
mass	Particle mass [GeV]
eKin	Kinetic energy [GeV]
dedx	Average specific energy loss [GeV/cm] @value Energy loss in the layer [GeV]

The energy loss is sampled from the Urban fluctuation model described in the GEANT3 manual (PHYS333 2.4, pp. 262-264).

Definition at line 121 of file BmnSsdPhysics.cxx.

Referenced by BmnSsdSensorDssd::ProduceCharge().

GetSiCharge()

static Double_t BmnSsdPhysics::GetSiCharge ( )

inlinestatic

Atomic charge of Silicon @value Atomic charge of Silicon [e]

Definition at line 76 of file BmnSsdPhysics.h.

Instance()

BmnSsdPhysics * BmnSsdPhysics::Instance ( )

static

Accessor to singleton instance @value Pointer to singleton instance Will instantiate a singleton object if not yet existing.

Definition at line 167 of file BmnSsdPhysics.cxx.

Referenced by BmnSsdSensorDssd::ProduceCharge().

LandauWidth()

Double_t BmnSsdPhysics::LandauWidth

(

Double_t

mostProbableCharge

)

Half width at half max of Landau distribution in ultrarelativistic case

Parameters

mostProbableCharge

[e] @value half width [e]

Definition at line 202 of file BmnSsdPhysics.cxx.

PairCreationEnergy()

static Double_t BmnSsdPhysics::PairCreationEnergy ( )

inlinestatic

Energy for electron-hole pair creation in silicon [GeV]

Definition at line 94 of file BmnSsdPhysics.h.

Referenced by BmnSsdSensorDssd::ProduceCharge().

ParticleCharge()

Double_t BmnSsdPhysics::ParticleCharge ( Int_t  pid )

static

Particle charge from PDG particle ID

Parameters

pid	PID (PDG code) @value particle charge [e]

For particles in the TDataBasePDG, the charge is taken from there. For ions, it is calculated following the PDG code convention. If not found, is returned.

Definition at line 212 of file BmnSsdPhysics.cxx.

Referenced by StoppingPower().

ParticleMass()

Double_t BmnSsdPhysics::ParticleMass ( Int_t  pid )

static

Particle mass from PDG particle ID

Parameters

pid	PID (PDG code) @value particle mass [GeV]

For particles in the TDataBasePDG, the mass is taken from there. For ions, it is calculated following the PDG code convention. If not found, zero is returned.

Definition at line 234 of file BmnSsdPhysics.cxx.

Referenced by BmnSsdSensorDssd::ProduceCharge(), and StoppingPower().

StoppingPower() [1/2]

Double_t BmnSsdPhysics::StoppingPower	(	Double_t	eKin,
		Int_t	pid
	)

Stopping power (average specific energy loss) in Silicon

Parameters

eKin	Kinetic energy pf the particle [GeV]
pid	Particle ID (PDG code) @value Stopping power [GeV/cm]

This function calculates the stopping power (average specific energy loss) in Silicon of a particle with given mass and charge. For an unknown pid, null is returned.

Definition at line 392 of file BmnSsdPhysics.cxx.

References ParticleCharge(), ParticleMass(), and StoppingPower().

Referenced by BmnSsdSensorDssd::ProduceCharge(), and StoppingPower().

StoppingPower() [2/2]

Double_t BmnSsdPhysics::StoppingPower	(	Double_t	energy,
		Double_t	mass,
		Double_t	charge,
		Bool_t	isElectron
	)

Stopping power in Silicon

Parameters

energy	Energy of particle [GeV]
mass	Particle mass [GeV]
charge	Electric charge [e]
isElectron	kTRUE if electron, kFALSE else @value Stopping power [GeV/cm]

This function calculates the stopping power (average specific energy loss) in Silicon of a particle with given mass and charge.

Definition at line 406 of file BmnSsdPhysics.cxx.

---

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

• detectors/ssd/digitize/BmnSsdPhysics.h
• detectors/ssd/digitize/BmnSsdPhysics.cxx