Defect investigation in irradiated ATLAS18 ITk Strip Sensors using transient spectroscopy techniques

With the upgrade of the LHC to the High-Luminosity LHC (HL-LHC), the Inner Detector will be replaced with the new all-silicon ATLAS Inner Tracker (ITk). Comprising an active area of 165 m 2 , the outer detector layers will host strip modules, built with single-sided micro-strip sensors. The ATLAS18 main sensors were tested at different institutes in the collaboration for mechanical and electrical compliance with technical specifications, while technological parameters were verified on test structures from the same wafers before and after irradiation. Diodes fabricated as test structures were studied using variants of Deep-Level Transient Spectroscopy (DLTS). Irradiated diode samples were measured with Current-DLTS, using both electrical and photo-induced injection. Utilising DLTS spectra with varying test parameters, trap energy levels and cross-sections associated with defects were obtained. This was done to improve the precision of sensor simulations as well as to compile a more complete model of radiation damage in ITk Strip Sensors. Moreover, previously observed features such as an increasing trend in the full depletion voltage after irradiation and little beneficial annealing in charge collection after high fluence irradiation of high energy protons were also investigated. Results obtained for samples with radiation damage from different sources at various fluences were compared.

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Publication Details

Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
Published
2025-06-16
DOI
https://doi.org/10.1016/j.nima.2025.170713
Primary Topic
Particle Detector Development and Performance
Type
article
Field-Weighted Citation Impact
0.00

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article

Defect investigation in irradiated ATLAS18 ITk Strip Sensors using transient spectroscopy techniques

C. E. Jessiman, V. Fadeyev, V. Cindro, J.S. Keller et al.
3 links
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
Particle Detector Development and Performance
article

Defect investigation in irradiated ATLAS18 ITk Strip Sensors using transient spectroscopy techniques

C. E. Jessiman, V. Fadeyev, V. Cindro, J.S. Keller, E. J. Staats, T. Koffas, P. Federičová, Y. Unno, C. Klein, M. Mikeštíková, M. Ullán, J. Kvasnička, Y. Zhao, I. Mandić, J. R. Dandoy, J. Kroll
article en

Abstract

With the upgrade of the LHC to the High-Luminosity LHC (HL-LHC), the Inner Detector will be replaced with the new all-silicon ATLAS Inner Tracker (ITk). Comprising an active area of 165 m 2 , the outer detector layers will host strip modules, built with single-sided micro-strip sensors. The ATLAS18 main sensors were tested at different institutes in the collaboration for mechanical and electrical compliance with technical specifications, while technological parameters were verified on test structures from the same wafers before and after irradiation. Diodes fabricated as test structures were studied using variants of Deep-Level Transient Spectroscopy (DLTS). Irradiated diode samples were measured with Current-DLTS, using both electrical and photo-induced injection. Utilising DLTS spectra with varying test parameters, trap energy levels and cross-sections associated with defects were obtained. This was done to improve the precision of sensor simulations as well as to compile a more complete model of radiation damage in ITk Strip Sensors. Moreover, previously observed features such as an increasing trend in the full depletion voltage after irradiation and little beneficial annealing in charge collection after high fluence irradiation of high energy protons were also investigated. Results obtained for samples with radiation damage from different sources at various fluences were compared.

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated EquipmentVol. 1080
High Energy Accelerator Research Organization (JP), University of California, Santa Cruz (US), Czech Academy of Sciences (CZ), Jožef Stefan Institute (SI), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Institut de Microelectrònica de Barcelona (ES), Institute of Particle and Nuclear Studies, Carleton University (CA)
U.S. Department of Energy, Canada Foundation for Innovation, Ministerstvo Školství, Mládeže a Tělovýchovy, Javna Agencija za Raziskovalno Dejavnost RS, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Natural Sciences and Engineering Research Council of Canada
Openalex Percentile: Top 94%
Particle Detector Development and Performance
DOIOpen Access PDFOpenAlex
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