Abstract
The GeoModel class library for detector description has recently been released as an open-source package and extended with a set of tools to allow much of the detector modeling to be carried out in a lightweight development environment, outside of large and complex software frameworks. These tools include the mechanisms for creating persistent representation of the geometry, an interactive 3D visualization tool, various command-line tools, a plugin system, and XML and JSON parsers. The overall goal of the tool suite is a fast geometry development cycle with quick visual feedback. The tool suite can be built on both Linux and Macintosh systems with minimal external dependencies. It includes useful command-line utilities: gmclash which runs clash detection, gmgeantino which generates geantino maps, and fullSimLight which runs GEANT4 simulation on geometry imported from GeoModel description. The GeoModel tool suite is presently in use in both the ATLAS and FASER experiments. In ATLAS it will be the basis of the LHC Run 4 geometry description.
Highlights
A class library for the description of detector geometry, called the GeoModel toolkit, has been used to express the ATLAS [1] detector in software for simulation and reconstruction workflows
The ATLAS experiment prepares for Run 3 of the Large Hadron Collider (LHC), and simultaneously gears up for Run 41, which is the first run of the High Luminosity LHC (HL-LHC) [3]
The GeoModel geometry kernel is a class library that has been developed within the ATLAS experiment in or around 2005 and used ever since, but recently it has been repackaged as an independent API, together with more recent elements of a tool suite that is described
Summary
A class library for the description of detector geometry, called the GeoModel toolkit, has been used to express the ATLAS [1] detector in software for simulation and reconstruction workflows. This phase will involve substantial changes for the ATLAS detector, with the installation of new sub-detector systems like the Inner Tracker (ITk) [4] and the HGTD [5], as well as major upgrades to the muon spectrometer In view of this future run, the authors are extending the GeoModel toolkit to a full tool suite [6], which contains powerful lightweight visual and GEANT4[7]-based debugging tools for detector description, and which can be used outside of the highly complex ATLAS computing infrastructure. Reproduction of this article or parts of it is allowed as specified in the CC-BY-4.0 license
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