CERN Accelerating science

Article
Title	ATLAS ITk strip detector for the Phase-II Upgrade
Related title	ERRATUM: ATLAS ITk strip detector for the Phase-II Upgrade
Author(s)	Herde, H (Lund U.)
Collaboration	ATLAS ITk Strip Collaboration
Publication	2024
Number of pages	9
In:	JINST 19, 03 (2024) pp.C03018 JINST 19, 06 (2024) pp.E06001
DOI	10.1088/1748-0221/19/03/C03018 (publication) 10.1088/1748-0221/19/06/E06001 (erratum)
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The inner detector of the present ATLAS experiment has been designed and developed tofunction in the environment of the present Large Hadron Collider (LHC). At the ATLAS Phase-IIUpgrade, the particle densities and radiation levels will exceed current levels by a factor often. The instantaneous luminosity is expected to reach unprecedented values, resulting in up to200 proton-proton interactions in a typical bunch crossing. The new detectors must be faster andthey need to be more highly segmented. The sensors used also need to be far more resistant toradiation, and they require much greater power delivery to the front-end systems. At the sametime, they cannot introduce excess material which could undermine tracking performance. For thosereasons, the inner tracker of the ATLAS detector was redesigned and will be rebuilt completely.The ATLAS Upgrade Inner Tracker (ITk) consists of several layers of silicon particledetectors. The innermost layers will be composed of silicon pixel sensors, and the outerlayers will consist of silicon microstrip sensors. This contribution focuses on the stripregion of the ITk. The central part of the strip tracker (barrel) will be composed ofrectangular short (∼2.5 cm) and long (∼5 cm) strip sensors. The forward regionsof the strip tracker (end-caps) consist of six disks per side, with trapezoidal shapedsensors of various lengths and strip pitches. After the completion of final design reviewsin key areas, such as Sensors, Modules, Front-End electronics, and ASICs, a large scaleprototyping program has been completed in all areas successfully. We present an overview ofthe Strip System and highlight the final design choices of sensors, module designs andASICs. We will summarise results achieved during prototyping and the current status ofpre-production and production on various detector components, with an emphasis on QA and QCprocedures.
Copyright/License	publication: © 2024 The Author(s) (License: CC-BY-4.0) erratum: (License: CC-BY-4.0)

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