Detector response for DSSD sensors with stereo angles and cross-connection by double metal layers. More...

#include <BmnSsdSensorDssdStereo.h>

Inheritance diagram for BmnSsdSensorDssdStereo:

Collaboration diagram for BmnSsdSensorDssdStereo:

Public Member Functions
	BmnSsdSensorDssdStereo (UInt_t address=0, TGeoPhysicalNode node=nullptr, BmnSsdElement mother=nullptr)

	BmnSsdSensorDssdStereo (Double_t dy, Int_t nStrips, Double_t pitch, Double_t stereoF, Double_t stereoB)

virtual	~BmnSsdSensorDssdStereo ()

virtual Int_t	GetNofStrips (Int_t) const
	Number of strips (same for front and back side)

virtual Double_t	GetPitch (Int_t) const
	Strip pitch (same for front and back side)

Double_t	GetStereoAngle (Int_t side) const
	Stereo angle for front and back side.

virtual Bool_t	Init ()
	Initialisation @value kTRUE if parameters and node are consistent.

virtual void	ModifyStripPitch (Double_t pitch)
	Modify the strip pitch.

std::string	ToString () const
	Set the internal sensor parameters.

Public Member Functions inherited from BmnSsdSensorDssd
	BmnSsdSensorDssd (Int_t address=0, TGeoPhysicalNode node=nullptr, BmnSsdElement mother=nullptr)

virtual	~BmnSsdSensorDssd ()

virtual Int_t	FindHits (std::vector< BmnSsdCluster * > &clusters, TClonesArray hitArray, BmnEvent event, Double_t dTime)
	Find hits from clusters.

void	PrintChargeStatus () const

Public Member Functions inherited from BmnSsdSensor
	BmnSsdSensor (UInt_t address=0, TGeoPhysicalNode node=nullptr, BmnSsdElement mother=nullptr)

virtual	~BmnSsdSensor ()

void	CreateHit (Double_t xLocal, Double_t yLocal, Double_t varX, Double_t varY, Double_t varXY, BmnSsdCluster clusterF, BmnSsdCluster clusterB, Double_t du=0., Double_t dv=0.)

const BmnSsdSensorConditions *	GetConditions () const

BmnLink *	GetCurrentLink () const

BmnSsdModule *	GetModule () const

TGeoPhysicalNode *	GetNode () const

Int_t	GetSensorId () const

Int_t	ProcessPoint (const BmnSsdPoint point, Double_t eventTime=0., BmnLink link=NULL)

void	SetAddress (Int_t address)
	Set sensor address.

void	SetConditions (Double_t vFD, Double_t vBias, Double_t temperature, Double_t cCoupling, Double_t cInterstrip, Double_t bX, Double_t bY, Double_t bZ)

void	SetNode (TGeoPhysicalNode *node)
	Set the physical node.

Public Member Functions inherited from BmnSsdElement
	BmnSsdElement ()

	BmnSsdElement (Int_t address, Int_t level, TGeoPhysicalNode node=nullptr, BmnSsdElement mother=nullptr)

virtual	~BmnSsdElement ()

Int_t	GetAddress () const

BmnSsdElement *	GetDaughter (Int_t index) const

Int_t	GetIndex () const

ESsdElementLevel	GetLevel () const

BmnSsdElement *	GetMother () const

Int_t	GetNofDaughters () const

Int_t	GetNofElements (Int_t level) const

TGeoPhysicalNode *	GetPnode () const

virtual void	InitDaughters ()

void	SetMother (BmnSsdElement *mother)

virtual void	Print (Option_t *opt="") 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)
	Used for calculation of hit errors.

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 std::pair< Int_t, Int_t >	GetStrip (Int_t channel, Int_t sensorId) const

virtual Int_t	GetStripNumber (Double_t x, Double_t y, Int_t side) const
	Get strip number from point coordinates.

Bool_t	Intersect (Double_t xF, Double_t exF, Double_t xB, Double_t exB, Double_t &x, Double_t &y, Double_t &varX, Double_t &varY, Double_t &varXY)

virtual Int_t	IntersectClusters (BmnSsdCluster clusterF, BmnSsdCluster clusterB)

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

Protected Member Functions inherited from BmnSsdSensorDssd
virtual Int_t	CalculateResponse (BmnSsdSensorPoint *point)
	Analogue response to a track in the sensor.

void	CrossTalk (Double_t ctcoeff)

void	GetClusterPosition (Double_t ClusterCentre, Double_t &xCluster, Int_t &side)

Int_t	GetSide (Double_t channel) const

Bool_t	IsInside (Double_t x, Double_t y)

Double_t	LorentzShift (Double_t z, Int_t chargeType, Double_t bY) const
	Lorentz shift in the x coordinate.

void	ProduceCharge (BmnSsdSensorPoint *point)
	Generate charge as response to a sensor point.

void	RegisterCharge (Int_t side, Int_t strip, Double_t charge, Double_t time) const
	Register the produced charge in one strip to the module.

Bool_t	SelfTest ()

Protected Member Functions inherited from BmnSsdSensor
	BmnSsdSensor (const BmnSsdSensor &)=delete

BmnSsdSensor &	operator= (const BmnSsdSensor &)=delete

	ClassDef (BmnSsdSensor, 2)

Protected Member Functions inherited from BmnSsdElement
void	ConstructName ()

void	SetLevel (Int_t level)

Protected Attributes
Int_t	fNofStrips
	Number of strips (same for front and back)

Double_t	fPitch
	Strip pitch /same for front and back)

Double_t	fStereoF
	Stereo angle front side [degrees].

Double_t	fStereoB
	Stereo angle front back side [degrees].

Double_t	fTanStereo [2]

Double_t	fCosStereo [2]
	tangent of stereo angle front/back side

Int_t	fStripShift [2]
	cosine of stereo angle front/back side

Double_t	fErrorFac
	Shift in number of strips from bottom to top.

Protected Attributes inherited from BmnSsdSensorDssd
Double_t	fDx
	Dimension of active area in x [cm].

Double_t	fDy
	Dimension of active area in y [cm].

Double_t	fDz
	Thickness in z [cm].

Bool_t	fIsSet
	Flag whether sensor is properly initialised.

TArrayD	fStripCharge [2]

Protected Attributes inherited from BmnSsdSensor
BmnSsdSensorConditions *	fConditions
	Operating conditions.

BmnLink *	fCurrentLink
	Link to currently processed MCPoint.

TClonesArray *	fHits
	Output array for hits. Used in hit finding.

BmnEvent *	fEvent

Protected Attributes inherited from BmnSsdElement
Int_t	fAddress
	Unique element address.

ESsdElementLevel	fLevel
	Level in hierarchy.

TGeoPhysicalNode *	fNode
	Pointer to geometry.

std::vector< BmnSsdElement * >	fDaughters
	Array of daughters.

BmnSsdElement *	fMother
	Mother element.

Additional Inherited Members
Static Public Member Functions inherited from BmnSsdSensor
static UInt_t	GetAddressFromName (TString name)
	Get the address from the sensor name (static)

Static Public Member Functions inherited from BmnSsdElement
static TString	ConstructName (Int_t address, ESsdElementLevel level)

Detailed Description

Detector response for DSSD sensors with stereo angles and cross-connection by double metal layers.

Author: V.Friese v.fri.nosp@m.ese@.nosp@m.gsi.d.nosp@m.e; D. Baranov

Version: 1.0

This class describes the response of double-sided silicon strip sensors with stereo angles ( < 90 degrees) on front and/or back side. .

The stereo angle is defined with respect to the y (vertical) axis. Readout is performed at the top edge of the sensor. In case of finite stereo angle, the corner strips not reaching the top edge are connected horizontally to the corresponding strip in the other corner.

A sensor of this type may be part of a daisy chain of several sensors arranged vertically on top of each others and being connected to the same module.

The mapping of strip number and module channel is trivial in the case of just one sensor per module. In case of several daisy-chained sensors, the top-edge strip is vertically connected vertically to the corresponding strip on the bottom edge of the sensor above. This results in an offset of strip number to channel number which depends on the position of the' sensor in the daisy chain. This behaviour is implemented in the methods GetStrip and GetModuleChannel.

Definition at line 45 of file BmnSsdSensorDssdStereo.h.

Constructor & Destructor Documentation

◆ BmnSsdSensorDssdStereo() [1/2]

BmnSsdSensorDssdStereo::BmnSsdSensorDssdStereo	(	UInt_t	address = `0`,
		TGeoPhysicalNode *	node = `nullptr`,
		BmnSsdElement *	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 BmnSsdSensorDssdStereo.cxx.

◆ BmnSsdSensorDssdStereo() [2/2]

BmnSsdSensorDssdStereo::BmnSsdSensorDssdStereo	(	Double_t	dy,
		Int_t	nStrips,
		Double_t	pitch,
		Double_t	stereoF,
		Double_t	stereoB
	)

Constructor

Parameters

dy	Length of active area in y [cm]
nStrips	Number of strips (same front and back)
pitch	Strip pitch [cm]
stereoF	Stereo angle front side [degrees]
stereoB	Stereo angle back side [degrees]

Definition at line 36 of file BmnSsdSensorDssdStereo.cxx.

References BmnSsdSensorDssd::fDy.

◆ ~BmnSsdSensorDssdStereo()

virtual BmnSsdSensorDssdStereo::~BmnSsdSensorDssdStereo ( )

inlinevirtual

Destructor

Definition at line 71 of file BmnSsdSensorDssdStereo.h.

Member Function Documentation

◆ Diffusion()

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

protectedvirtual

Used for calculation of hit errors.

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 58 of file BmnSsdSensorDssdStereo.cxx.

References fCosStereo, BmnSsdSensorDssd::fDx, BmnSsdSensorDssd::fDy, fPitch, and fTanStereo.

Referenced by PropagateCharge().

◆ GetModuleChannel()

Int_t BmnSsdSensorDssdStereo::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.

Implements BmnSsdSensorDssd.

Definition at line 101 of file BmnSsdSensorDssdStereo.cxx.

References fNofStrips, and fStripShift.

◆ GetNofStrips()

virtual Int_t BmnSsdSensorDssdStereo::GetNofStrips ( Int_t ) const

inlinevirtual

Number of strips (same for front and back side)

Parameters

side	Not used @value Number of strips

Implements BmnSsdSensorDssd.

Definition at line 78 of file BmnSsdSensorDssdStereo.h.

References fNofStrips.

◆ GetPitch()

virtual Double_t BmnSsdSensorDssdStereo::GetPitch ( Int_t ) const

inlinevirtual

Strip pitch (same for front and back side)

Parameters

side	Not used @value Strip pitch

Implements BmnSsdSensorDssd.

Definition at line 85 of file BmnSsdSensorDssdStereo.h.

References fPitch.

◆ GetStereoAngle()

Double_t BmnSsdSensorDssdStereo::GetStereoAngle ( Int_t side ) const

inline

Stereo angle for front and back side.

Parameters

side	0 = front side, 1 = back side @value Stereo angle [degrees] on the specified sensor side

Definition at line 92 of file BmnSsdSensorDssdStereo.h.

References fStereoB, and fStereoF.

Referenced by BmnSsdStation::GetSensorStereoAngle().

◆ GetStrip()

pair< Int_t, Int_t > BmnSsdSensorDssdStereo::GetStrip	(	Int_t	channel,
		Int_t	sensorId
	)		const

protectedvirtual

Get strip and side from module channel.

Parameters

[in]	channel	Channel number in module
[in]	sensorId	Sensor index in module @value Pair of strip number and side

Note: This must be the inverse of GetModuleChannel.

Implements BmnSsdSensorDssd.

Definition at line 124 of file BmnSsdSensorDssdStereo.cxx.

References fNofStrips, and fStripShift.

◆ GetStripNumber()

Int_t BmnSsdSensorDssdStereo::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 154 of file BmnSsdSensorDssdStereo.cxx.

References BmnSsdSensorDssd::fDx, BmnSsdSensorDssd::fDy, fNofStrips, fPitch, and fTanStereo.

Referenced by PropagateCharge().

◆ Init()

Bool_t BmnSsdSensorDssdStereo::Init ( )

virtual

Initialisation @value kTRUE if parameters and node are consistent.

The consistency of geometric node and sensor parameters is checked; derived parameters are calculated.

Reimplemented from BmnSsdSensor.

Definition at line 200 of file BmnSsdSensorDssdStereo.cxx.

References fCosStereo, BmnSsdSensorDssd::fDx, BmnSsdSensorDssd::fDy, BmnSsdSensorDssd::fDz, fErrorFac, BmnSsdSensorDssd::fIsSet, BmnSsdElement::fNode, fNofStrips, fPitch, fStereoB, fStereoF, BmnSsdSensorDssd::fStripCharge, fStripShift, fTanStereo, and BmnSsdSensorDssd::SelfTest().

Referenced by BmnSsdSetup::DefaultSensor().

◆ Intersect()

Bool_t BmnSsdSensorDssdStereo::Intersect	(	Double_t	xF,
		Double_t	exF,
		Double_t	xB,
		Double_t	exB,
		Double_t &	x,
		Double_t &	y,
		Double_t &	varX,
		Double_t &	varY,
		Double_t &	varXY
	)

protected

Intersection point of two strips / cluster centres

Parameters

[in]	xF	x coordinate on read-out edge, front side [cm]
[in]	exF	uncertainty on xF [cm]
[in]	xB	x coordinate on read-out edge, back side [cm]
[in]	eBF	uncertainty on xB [cm]
[out]	x	x coordinate of crossing [cm]
[out]	y	y coordinate of crossing [cm]
[out]	varX	Variance in x [cm^2]
[out]	varY	Variance in y [cm^2]
[out]	varXY	Covariance of x and y [cm^2]

Returns: kTRUE if intersection is inside active area.

This function calculates the intersection point of two lines starting at xF and xB at the top edge with slopes corresponding to the respective stereo angle.

All coordinates are in the sensor frame with the origin in the bottom left corner of the active area.

Definition at line 279 of file BmnSsdSensorDssdStereo.cxx.

References BmnSsdSensorDssd::fDx, BmnSsdSensorDssd::fDy, fErrorFac, fStereoB, fStereoF, fTanStereo, and BmnSsdSensorDssd::IsInside().

Referenced by IntersectClusters().

◆ IntersectClusters()

Int_t BmnSsdSensorDssdStereo::IntersectClusters	(	BmnSsdCluster *	clusterF,
		BmnSsdCluster *	clusterB
	)

protectedvirtual

Find the intersection points of two clusters. For each intersection point, a hit is created.

Parameters

clusterF	Pointer to cluster on front side
clusterB	Pointer to cluster on back side
sensor	Pointer to sensor object

Returns: Number of intersection points inside active area

Implements BmnSsdSensorDssd.

Definition at line 342 of file BmnSsdSensorDssdStereo.cxx.

References BmnSsdSensor::CreateHit(), BmnSsdSensorDssd::fDx, BmnSsdSensorDssd::fDy, fPitch, fStereoB, fStereoF, fTanStereo, BmnSsdSensorDssd::GetClusterPosition(), BmnSsdElement::GetIndex(), BmnSsdCluster::GetPosition(), BmnSsdCluster::GetPositionError(), and Intersect().

◆ ModifyStripPitch()

void BmnSsdSensorDssdStereo::ModifyStripPitch ( Double_t pitch )

virtual

Modify the strip pitch.

Parameters

New	strip pitch [cm]

The number of strips is re-calculated accordingly.

Implements BmnSsdSensorDssd.

Definition at line 457 of file BmnSsdSensorDssdStereo.cxx.

References BmnSsdSensorDssd::fDx, BmnSsdSensorDssd::fIsSet, fNofStrips, fPitch, and BmnSsdSensorDssd::fStripCharge.

◆ PropagateCharge()

void BmnSsdSensorDssdStereo::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

Implements BmnSsdSensorDssd.

Definition at line 476 of file BmnSsdSensorDssdStereo.cxx.

References Diffusion(), BmnSsdPhysics::DiffusionWidth(), BmnSsdSensorDssd::fDz, fNofStrips, BmnSsdSensorDssd::fStripCharge, fTanStereo, BmnSsdSensor::GetConditions(), GetStripNumber(), BmnSsdSetup::Instance(), BmnSsdSensorDssd::IsInside(), and BmnSsdSensorDssd::LorentzShift().

◆ ToString()

std::string BmnSsdSensorDssdStereo::ToString ( ) const

virtual

Set the internal sensor parameters.

Parameters

dy	Size of active area in y [cm]
nStrips	Number of strips (same for front and back)
pitch	Strip pitch [cm] (same for front and back)
stereoF	Strip stereo angle front side [degrees]
stereoB	Strip stereo angle back side [degrees] @value kTRUE if parameters are successfully set; else kFALSE

String output

Implements BmnSsdSensorDssd.

Definition at line 574 of file BmnSsdSensorDssdStereo.cxx.

References BmnSsdSensor::fConditions, BmnSsdSensorDssd::fDy, fNofStrips, fPitch, fStereoB, fStereoF, BmnSsdElement::GetPnode(), and BmnSsdSensorConditions::ToString().

Member Data Documentation

◆ fCosStereo

Double_t BmnSsdSensorDssdStereo::fCosStereo[2]

protected

tangent of stereo angle front/back side

Definition at line 140 of file BmnSsdSensorDssdStereo.h.

Referenced by Diffusion(), and Init().

◆ fErrorFac

Double_t BmnSsdSensorDssdStereo::fErrorFac

protected

Shift in number of strips from bottom to top.

Definition at line 142 of file BmnSsdSensorDssdStereo.h.

Referenced by Init(), and Intersect().

◆ fNofStrips

Int_t BmnSsdSensorDssdStereo::fNofStrips

protected

Number of strips (same for front and back)

Definition at line 133 of file BmnSsdSensorDssdStereo.h.

Referenced by GetModuleChannel(), GetNofStrips(), GetStrip(), GetStripNumber(), Init(), ModifyStripPitch(), PropagateCharge(), and ToString().

◆ fPitch

Double_t BmnSsdSensorDssdStereo::fPitch

protected

Strip pitch /same for front and back)

Definition at line 134 of file BmnSsdSensorDssdStereo.h.

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

◆ fStereoB

Double_t BmnSsdSensorDssdStereo::fStereoB

protected

Stereo angle front back side [degrees].

Definition at line 136 of file BmnSsdSensorDssdStereo.h.

Referenced by GetStereoAngle(), Init(), Intersect(), IntersectClusters(), and ToString().

◆ fStereoF

Double_t BmnSsdSensorDssdStereo::fStereoF

protected

Stereo angle front side [degrees].

Definition at line 135 of file BmnSsdSensorDssdStereo.h.

Referenced by GetStereoAngle(), Init(), Intersect(), IntersectClusters(), and ToString().

◆ fStripShift

Int_t BmnSsdSensorDssdStereo::fStripShift[2]

protected

cosine of stereo angle front/back side

Definition at line 141 of file BmnSsdSensorDssdStereo.h.

Referenced by GetModuleChannel(), GetStrip(), and Init().

◆ fTanStereo

Double_t BmnSsdSensorDssdStereo::fTanStereo[2]

protected

Temporary variables to avoid frequent calculations

Definition at line 139 of file BmnSsdSensorDssdStereo.h.

Referenced by Diffusion(), GetStripNumber(), Init(), Intersect(), IntersectClusters(), and PropagateCharge().

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

detectors/ssd/digitize/BmnSsdSensorDssdStereo.h
detectors/ssd/digitize/BmnSsdSensorDssdStereo.cxx

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ BmnSsdSensorDssdStereo() [1/2]

◆ BmnSsdSensorDssdStereo() [2/2]

◆ ~BmnSsdSensorDssdStereo()

Member Function Documentation

◆ Diffusion()

◆ GetModuleChannel()

◆ GetNofStrips()

◆ GetPitch()

◆ GetStereoAngle()

◆ GetStrip()

◆ GetStripNumber()

◆ Init()

◆ Intersect()

◆ IntersectClusters()

◆ ModifyStripPitch()

◆ PropagateCharge()

◆ ToString()

Member Data Documentation

◆ fCosStereo

◆ fErrorFac

◆ fNofStrips

◆ fPitch

◆ fStereoB

◆ fStereoF

◆ fStripShift

◆ fTanStereo