Configuration for the Surround Background Tagger (SBT) geometry. More...

#include <SBTConfig.h>

Public Member Functions
double	subLength () const
	Length of one sub-frustum along Z (mm).

double	webHeight () const
	Clear web height = height - 2*flange thickness (mm).

int	nWalls () const
	Number of aluminium walls per container (n_cells + 1).

double	zExit () const
	Exit-face Z in the DecayVolume local frame (mm).

double	xGrowth () const
	dx_half/dz of the frustum (dimensionless).

double	yGrowth () const
	dy_half/dz of the frustum (dimensionless).

double	xHalfAt (double z_mm) const
	Half-extent of the frustum envelope in X at a given Z (mm).

double	yHalfAt (double z_mm) const
	Half-extent of the frustum envelope in Y at a given Z (mm).

double	zSubLo (int s) const
	Z of the start of sub-frustum `s` (mm).

double	hbeamFlangeOffset () const
	Offset of a flange's mid-plane from the beam axis (mm).

double	hbeamHalfHeight () const
	Reach of a flange's outer surface from the beam axis (mm) = h/2.

double	zSplitOffset () const
	Z offset, from the start of a sub-frustum, of the column front-flange outer edge.

double	sideContainerHalfThickness () const
	Half-thickness of a side container in X (mm).

double	sideContainerCentreX (double x_half_mm) const
	\|X\| of a side container's centroid, given the local frustum half-width.

double	sideSensorInnerX (double x_half_mm) const
	\|X\| of a side container's innermost face (mm).

double	topBottomContainerHalfThickness () const
	Half-thickness of a top/bottom container in Y (mm).

double	topBottomContainerCentreY (double y_half_mm) const
	\|Y\| of a top/bottom container's centroid (mm).

double	topBottomSensorInnerY (double y_half_mm) const
	\|Y\| of a top/bottom container's innermost face (mm).

double	topBottomAvailX (double x_half_mm) const
	Half-extent in X available to top/bottom containers (mm).

double	longBeamCentreY (double y_half_mm) const
	\|Y\| of a top/bottom longitudinal beam's axis (mm).

double	longBeamInnerY (double y_half_mm) const
	\|Y\| reached by a longitudinal beam's inner flange surface (mm).

Public Attributes
double	x_half_entrance_mm = 1000.0

double	y_half_entrance_mm = 1500.0

double	x_half_exit_mm = 2000.0

double	y_half_exit_mm = 3000.0

double	total_length_mm = 50000.0

int	n_sub_frustum = 10

double	y_floor_mm = -3000.0

double	z_entrance_mm = -25000.0

double	hbeam_height_mm = 250.0

double	hbeam_flange_width_mm = 260.0

double	hbeam_flange_thickness_mm = 12.5

double	hbeam_web_thickness_mm = 7.5

double	container_thickness_mm = 225.0

double	wall_thickness_mm = 5.0

int	n_cells = 6

double	sensor_clearance_mm = 1.0

double	helium_clearance_mm = 0.001

std::string	material_steel = "Iron"

std::string	material_wall = "Aluminium"

std::string	material_cell = "LAB"

std::string	material_helium = "PressurisedHe90"

std::string	material_air = "Air"

Detailed Description

Configuration for the Surround Background Tagger (SBT) geometry.

Populated by readSBTConfig() from an sbt.toml file. Drives the steel H-beam supporting structure, the LAB scintillator sensor containers, and the central helium volume of the DecayVolume subsystem. All lengths in mm.

Member Function Documentation

◆ hbeamFlangeOffset()

double SHiPGeometry::SBTConfig::hbeamFlangeOffset ( ) const

inline

Offset of a flange's mid-plane from the beam axis (mm).

◆ hbeamHalfHeight()

double SHiPGeometry::SBTConfig::hbeamHalfHeight ( ) const

inline

Reach of a flange's outer surface from the beam axis (mm) = h/2.

◆ longBeamCentreY()

double SHiPGeometry::SBTConfig::longBeamCentreY ( double y_half_mm ) const

inline

|Y| of a top/bottom longitudinal beam's axis (mm).

◆ longBeamInnerY()

double SHiPGeometry::SBTConfig::longBeamInnerY ( double y_half_mm ) const

inline

|Y| reached by a longitudinal beam's inner flange surface (mm).

The beam is inclined by the frustum taper, so its cross-section is rotated: the flange surface lies hbeamHalfHeight()/cos(atan(yGrowth)) from the axis measured in world Y, not hbeamHalfHeight().

◆ nWalls()

int SHiPGeometry::SBTConfig::nWalls ( ) const

inline

Number of aluminium walls per container (n_cells + 1).

◆ sideContainerCentreX()

double SHiPGeometry::SBTConfig::sideContainerCentreX ( double x_half_mm ) const

inline

|X| of a side container's centroid, given the local frustum half-width.

◆ sideContainerHalfThickness()

double SHiPGeometry::SBTConfig::sideContainerHalfThickness ( ) const

inline

Half-thickness of a side container in X (mm).

◆ sideSensorInnerX()

double SHiPGeometry::SBTConfig::sideSensorInnerX ( double x_half_mm ) const

inline

|X| of a side container's innermost face (mm).

◆ subLength()

double SHiPGeometry::SBTConfig::subLength ( ) const

inline

Length of one sub-frustum along Z (mm).

◆ topBottomAvailX()

double SHiPGeometry::SBTConfig::topBottomAvailX ( double x_half_mm ) const

inline

Half-extent in X available to top/bottom containers (mm).

The container stops half a flange width short of the frustum wall (that is where the columns' inner face is), less a 1 mm gap so it does not land flush against them. The 1 mm is inherited from the original SBTSensorBuilder and is a literal, not sensor_clearance_mm — the two happen to be equal at the current settings, which is worth being aware of when changing sensor_clearance_mm, but they are not the same quantity and this one is deliberately left as-is.

◆ topBottomContainerCentreY()

double SHiPGeometry::SBTConfig::topBottomContainerCentreY ( double y_half_mm ) const

inline

|Y| of a top/bottom container's centroid (mm).

◆ topBottomContainerHalfThickness()

double SHiPGeometry::SBTConfig::topBottomContainerHalfThickness ( ) const

inline

Half-thickness of a top/bottom container in Y (mm).

◆ topBottomSensorInnerY()

double SHiPGeometry::SBTConfig::topBottomSensorInnerY ( double y_half_mm ) const

inline

|Y| of a top/bottom container's innermost face (mm).

◆ webHeight()

double SHiPGeometry::SBTConfig::webHeight ( ) const

inline

Clear web height = height - 2*flange thickness (mm).

◆ xGrowth()

double SHiPGeometry::SBTConfig::xGrowth ( ) const

inline

dx_half/dz of the frustum (dimensionless).

◆ xHalfAt()

double SHiPGeometry::SBTConfig::xHalfAt ( double z_mm ) const

inline

Half-extent of the frustum envelope in X at a given Z (mm).

◆ yGrowth()

double SHiPGeometry::SBTConfig::yGrowth ( ) const

inline

dy_half/dz of the frustum (dimensionless).

◆ yHalfAt()

double SHiPGeometry::SBTConfig::yHalfAt ( double z_mm ) const

inline

Half-extent of the frustum envelope in Y at a given Z (mm).

◆ zExit()

double SHiPGeometry::SBTConfig::zExit ( ) const

inline

Exit-face Z in the DecayVolume local frame (mm).

◆ zSplitOffset()

double SHiPGeometry::SBTConfig::zSplitOffset ( ) const

inline

Z offset, from the start of a sub-frustum, of the column front-flange outer edge.

Sensor containers are split here: the piece upstream of it must present a flat outer face, or it would eat into the column.

◆ zSubLo()

double SHiPGeometry::SBTConfig::zSubLo ( int s ) const

inline

Z of the start of sub-frustum s (mm).

Member Data Documentation

◆ container_thickness_mm

double SHiPGeometry::SBTConfig::container_thickness_mm = 225.0

◆ hbeam_flange_thickness_mm

double SHiPGeometry::SBTConfig::hbeam_flange_thickness_mm = 12.5

◆ hbeam_flange_width_mm

double SHiPGeometry::SBTConfig::hbeam_flange_width_mm = 260.0

◆ hbeam_height_mm

double SHiPGeometry::SBTConfig::hbeam_height_mm = 250.0

◆ hbeam_web_thickness_mm

double SHiPGeometry::SBTConfig::hbeam_web_thickness_mm = 7.5

◆ helium_clearance_mm

double SHiPGeometry::SBTConfig::helium_clearance_mm = 0.001

◆ material_air

std::string SHiPGeometry::SBTConfig::material_air = "Air"

◆ material_cell

std::string SHiPGeometry::SBTConfig::material_cell = "LAB"

◆ material_helium

std::string SHiPGeometry::SBTConfig::material_helium = "PressurisedHe90"

◆ material_steel

std::string SHiPGeometry::SBTConfig::material_steel = "Iron"

◆ material_wall

std::string SHiPGeometry::SBTConfig::material_wall = "Aluminium"

◆ n_cells

int SHiPGeometry::SBTConfig::n_cells = 6

◆ n_sub_frustum

int SHiPGeometry::SBTConfig::n_sub_frustum = 10

◆ sensor_clearance_mm

double SHiPGeometry::SBTConfig::sensor_clearance_mm = 1.0

◆ total_length_mm

double SHiPGeometry::SBTConfig::total_length_mm = 50000.0

◆ wall_thickness_mm

double SHiPGeometry::SBTConfig::wall_thickness_mm = 5.0

◆ x_half_entrance_mm

double SHiPGeometry::SBTConfig::x_half_entrance_mm = 1000.0

◆ x_half_exit_mm

double SHiPGeometry::SBTConfig::x_half_exit_mm = 2000.0

◆ y_floor_mm

double SHiPGeometry::SBTConfig::y_floor_mm = -3000.0

◆ y_half_entrance_mm

double SHiPGeometry::SBTConfig::y_half_entrance_mm = 1500.0

◆ y_half_exit_mm

double SHiPGeometry::SBTConfig::y_half_exit_mm = 3000.0

◆ z_entrance_mm

double SHiPGeometry::SBTConfig::z_entrance_mm = -25000.0

The documentation for this struct was generated from the following file:

subsystems/DecayVolume/include/DecayVolume/SBTConfig.h

Public Member Functions

Public Attributes

Detailed Description

Member Function Documentation

◆ hbeamFlangeOffset()

◆ hbeamHalfHeight()

◆ longBeamCentreY()

◆ longBeamInnerY()

◆ nWalls()

◆ sideContainerCentreX()

◆ sideContainerHalfThickness()

◆ sideSensorInnerX()

◆ subLength()

◆ topBottomAvailX()

◆ topBottomContainerCentreY()

◆ topBottomContainerHalfThickness()

◆ topBottomSensorInnerY()

◆ webHeight()

◆ xGrowth()

◆ xHalfAt()

◆ yGrowth()

◆ yHalfAt()

◆ zExit()

◆ zSplitOffset()

◆ zSubLo()

Member Data Documentation

◆ container_thickness_mm

◆ hbeam_flange_thickness_mm

◆ hbeam_flange_width_mm

◆ hbeam_height_mm

◆ hbeam_web_thickness_mm

◆ helium_clearance_mm

◆ material_air

◆ material_cell

◆ material_helium

◆ material_steel

◆ material_wall

◆ n_cells

◆ n_sub_frustum

◆ sensor_clearance_mm

◆ total_length_mm

◆ wall_thickness_mm

◆ x_half_entrance_mm

◆ x_half_exit_mm

◆ y_floor_mm

◆ y_half_entrance_mm

◆ y_half_exit_mm

◆ z_entrance_mm