This page contains information about the most recent version of the SBND geometry (v02_00). The content here presented is constantly being updated as requested.

SBND Detector Geometry

Detector description files are stored in GDML format in the sbndcode/Geometry/gdml directory. The file name is sbnd_<PATCHLEVEL>.gdml (<PATCHLEVEL> is reported in the namesake column of the table below).

The “standard” configuration of SBND geometry is contained in the sbnd_geometry_services configuration bundle, and in particular in the sbnd_geo_source, in sbndcode/Geometry/geometry_sbnd.fcl file. The name of the GDML file loaded by LArSoft geometry is printed on the console when the Geometry service is initialised or updated.

A “no wires” version is present for each regular one, which has no TPC wires. This special file is not processed by LArSoft geometry but is intended to be used for Geant4 simulation, where the presence of wires has been shown to strongly slow down the simulation for little physics gain.

NOTE: Files produced with a version of sbndcode prior to v09_25_00_01 cannot be analyzed with v09_25_00_01 or higher, as the geometry v02_00 is a breaking change. To analyze old files, you need to add the following at the end of your fcl file in order to set the old geometry:
services.Geometry.GDML: "sbnd_v01_05.gdml"
services.Geometry.ROOT: "sbnd_v01_05.gdml"
services.AuxDetGeometry.GDML: "sbnd_v01_05.gdml"
services.AuxDetGeometry.ROOT: "sbnd_v01_05.gdml"

Series	Variant	Patch level	Present in `sbndcode`	Default in `sbndcode`	Description
`2`	`2.0`	`v02_00`	`v09_25_00_01` to `develop`	`v09_25_00_01`	Description
`1`	`1.5`	`v01_05`	`v09_01_00` to `develop`	`v09_01_00`	`v01_04` + Description
`1`	`1.4`	`v01_04`	`v08_36_01_1_MCP2_0` to `v09_25_00_01`	`v08_36_01_1_MCP2_0`	`v01_03` - bars + X-ARAPUCAs + field cage
`1`	`1.3`	`v01_03`	`v08_13_00` to `v09_25_00_01`	`v08_35_00` to `v08_36_01`	`v01_02` + semi-sphere PMTs model + 5 PMTs per APA window
`1`	`1.2`	`v01_02`	`v06_64_00` to `v09_25_00_01`		`v01_01` + arapuca, light bars and foils
`1`	`1.1`	`v01_01`	`v06_48_00_MCC` to `v09_25_00_01`	`v06_48_00_MCC`	baseline + overburden
`1`	`1.0`	`v01_00_01`	`v06_46_00` to `v06_47_00`		Two TPCs, with CRT, without overburden (baseline)
`1`	`1.0`	`v01_00`	`v06_46_00` to `v06_47_00`	`v06_46_00` to `v06_48_00`	Two TPCs, with CRT, without overburden (bugged baseline: no CPA and APA)

Versions prior to 1.0 are not documented here.

Questions about the geometry? Post them in the #sbnd_geometry Slack channel, or contact Gustavo Valdiviesso, Marina Reggiani-Guzzo, and Marco Del Tutto.