CbmStsSensorDssdOrtho Class Reference

Detector response for DSSD sensors with orthogonal strips. More...

#include <CbmStsSensorDssdOrtho.h>

Inheritance diagram for CbmStsSensorDssdOrtho:

Collaboration diagram for CbmStsSensorDssdOrtho:

Public Member Functions
	CbmStsSensorDssdOrtho (UInt_t address=0, TGeoPhysicalNode *node=nullptr, CbmStsElement *mother=nullptr)
virtual	~CbmStsSensorDssdOrtho ()
virtual Double_t	GetPitch (Int_t side) const
	Strip pitch for front and back side.
virtual void	ModifyStripPitch (Double_t pitch)
	Modify the strip pitch.
Bool_t	SetParameters (Int_t nStripsF, Double_t pitchF, Int_t nStripsB, Double_t pitchB)
	Set the internal sensor parameters.
std::string	ToString () const

Protected Member Functions
virtual void	Diffusion (Double_t x, Double_t y, Double_t sigma, Int_t side, Double_t &fracL, Double_t &fracC, Double_t &fracR)
	Strip pitch front/back side [cm].
virtual Int_t	GetModuleChannel (Int_t strip, Int_t side, Int_t sensorId) const
	Get the readout channel in the module for a given strip.
virtual Int_t	GetNofStrips (Int_t side) const
	Number of strips on front or back side.
virtual Int_t	GetStripNumber (Double_t x, Double_t y, Int_t side) const
	Get strip number from point coordinates.
virtual void	PropagateCharge (Double_t x, Double_t y, Double_t z, Double_t charge, Double_t bY, Int_t side)

Protected Attributes
Int_t	fNofStrips [2]
	Number of strips on front/back side.
Double_t	fPitch [2]

Detailed Description

Detector response for DSSD sensors with orthogonal strips.

Author

V.Friese v.fri.nosp@m.ese@.nosp@m.gsi.d.nosp@m.e

Version

1.0

This class describes the response of double-sided silicon strip sensors with vertical strips on the front side, which are read out at the top edge, and horizontal strips at the back side, which are read out at the left edge.

For these sensors, a daisy-chain with other sensors is not allowed. The mapping of strip number and module channel is thus trivial.

Definition at line 29 of file CbmStsSensorDssdOrtho.h.

Constructor & Destructor Documentation

CbmStsSensorDssdOrtho()

CbmStsSensorDssdOrtho::CbmStsSensorDssdOrtho	(	UInt_t	address = 0,
		TGeoPhysicalNode *	node = nullptr,
		CbmStsElement *	mother = nullptr
	)

Constructor

Parameters

address	Unique element address
node	Pointer to geometry node
mother	Pointer to mother element (module)

Definition at line 22 of file CbmStsSensorDssdOrtho.cxx.

~CbmStsSensorDssdOrtho()

virtual CbmStsSensorDssdOrtho::~CbmStsSensorDssdOrtho ( )

inlinevirtual

Destructor

Definition at line 44 of file CbmStsSensorDssdOrtho.h.

Member Function Documentation

Diffusion()

void CbmStsSensorDssdOrtho::Diffusion ( Double_t  x, Double_t  y, Double_t  sigma, Int_t  side, Double_t &  fracL, Double_t &  fracC, Double_t &  fracR  )

protectedvirtual

Strip pitch front/back side [cm].

Charge diffusion into adjacent strips

Parameters

[in]	x	x coordinate of charge centre (local c.s.) [cm]
[in]	y	y coordinate of charge centre (local c.s.) [cm]
[in]	sigma	Diffusion width [cm]
[in]	side	0 = front (p) side, 1 = back (n) side
[out]	fracL	Fraction of charge in left neighbour strip
[out]	fracC	Fraction of charge in centre strip
[out]	fracR	Fraction of charge in right neighbour strip

Calculates the fraction of charge in the most significant (centre) strip and its left and right neighbours. The charge distribution is assumed to be a 2-d Gaussian (resulting from thermal diffusion) with centre (x,y) and width sigma in both dimensions. The integration is performed in the coordinate across the strips. For simplicity, all charge left (right) of the centre strip is accumulated in the left (right) neighbour; this is justified since typical values of the diffusion width are much smaller than the strip pitch. The charge in the neighbouring strip is neglected if it is more distant than 3 sigma from the charge centre. Edge effects are neglected, i.e. diffusion into the inactive area is allowed.

Definition at line 34 of file CbmStsSensorDssdOrtho.cxx.

References fPitch.

Referenced by PropagateCharge().

GetModuleChannel()

Int_t CbmStsSensorDssdOrtho::GetModuleChannel ( Int_t  strip, Int_t  side, Int_t  sensorId  ) const

protectedvirtual

Get the readout channel in the module for a given strip.

Parameters

strip	Strip number
side	Side (0 = front, 1 = back)
sensorId	Index of sensor within module

Returns

Channel number in module

This method defines the mapping of the sensor strips to the readout channels in the module.

Definition at line 76 of file CbmStsSensorDssdOrtho.cxx.

References fNofStrips.

GetNofStrips()

virtual Int_t CbmStsSensorDssdOrtho::GetNofStrips ( Int_t  side ) const

inlineprotectedvirtual

Number of strips on front or back side.

Parameters

side	0 = front side, 1 = back side

Returns

Number of strips

Definition at line 132 of file CbmStsSensorDssdOrtho.h.

References fNofStrips.

GetPitch()

virtual Double_t CbmStsSensorDssdOrtho::GetPitch ( Int_t  side ) const

inlinevirtual

Strip pitch for front and back side.

Parameters

side	0 = front side, 1 = back side @value Strip pitch [cm] on the specified sensor side

Definition at line 51 of file CbmStsSensorDssdOrtho.h.

References fPitch.

GetStripNumber()

Int_t CbmStsSensorDssdOrtho::GetStripNumber ( Double_t  x, Double_t  y, Int_t  side  ) const

protectedvirtual

Get strip number from point coordinates.

Parameters

x	x coordinate [cm]
y	y coordinate [cm]
side	0 = front side, 1 = back side

Returns

strip number on selected side

Definition at line 94 of file CbmStsSensorDssdOrtho.cxx.

References dist(), and fPitch.

Referenced by PropagateCharge().

ModifyStripPitch()

void CbmStsSensorDssdOrtho::ModifyStripPitch ( Double_t  pitch )

virtual

Modify the strip pitch.

Parameters

New	strip pitch [cm]

The number of strips is re-calculated accordingly.

Definition at line 124 of file CbmStsSensorDssdOrtho.cxx.

References fNofStrips, and fPitch.

PropagateCharge()

void CbmStsSensorDssdOrtho::PropagateCharge ( Double_t  x, Double_t  y, Double_t  z, Double_t  charge, Double_t  bY, Int_t  side  )

protectedvirtual

Propagate a charge created in the sensor to the readout strips

Parameters

x	x origin of charge in local c.s. [cm]
y	y origin of charge in local c.s. [cm]
z	z origin of charge in local c.s. [cm]
charge	Charge [e]
bY	Magnetic field (y component) [T]
side	0 = front (n) side; 1 = back (p) side
sensor	Pointer to sensor object

Definition at line 146 of file CbmStsSensorDssdOrtho.cxx.

References Diffusion(), fNofStrips, GetStripNumber(), and CbmStsSetup::Instance().

SetParameters()

Bool_t CbmStsSensorDssdOrtho::SetParameters	(	Int_t	nStripsF,
		Double_t	pitchF,
		Int_t	nStripsB,
		Double_t	pitchB
	)

Set the internal sensor parameters.

Parameters

nStripsF	Number of strips front side (vertical)
pitchF	Strip pitch front side [cm]
stereoF	Strip stereo angle front side [degrees]
nStripsB	Number of strips back side (horizontal)
pitchB	Strip pitch back side [cm]
stereoB	Strip stereo angle back side [degrees] @value kTRUE if parameters are successfully set; else kFALSE

Definition at line 236 of file CbmStsSensorDssdOrtho.cxx.

References fNofStrips, and fPitch.

ToString()

string CbmStsSensorDssdOrtho::ToString

(

)

const

String output

Definition at line 277 of file CbmStsSensorDssdOrtho.cxx.

References fNofStrips, and fPitch.

Member Data Documentation

fNofStrips

Int_t CbmStsSensorDssdOrtho::fNofStrips[2]

protected

Number of strips on front/back side.

Definition at line 85 of file CbmStsSensorDssdOrtho.h.

Referenced by GetModuleChannel(), GetNofStrips(), ModifyStripPitch(), PropagateCharge(), SetParameters(), and ToString().

fPitch

Double_t CbmStsSensorDssdOrtho::fPitch[2]

protected

Definition at line 86 of file CbmStsSensorDssdOrtho.h.

Referenced by Diffusion(), GetPitch(), GetStripNumber(), ModifyStripPitch(), SetParameters(), and ToString().

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

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