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Initial tests of large format sensors for the ATLAS ITk strip tracker
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SYSNO ASEP 0541870 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Initial tests of large format sensors for the ATLAS ITk strip tracker Author(s) Klein, C. T. (GB)
Hommels, L. B. A. (GB)
Fadeyev, V. (US)
Gillberg, D. (CA)
Hara, K. (JP)
Keller, J.S. (CA)
Koffas, T. (CA)
Kroll, Jiří (FZU-D) ORCID
Lee, S.J. (CA)
Mikeštíková, Marcela (FZU-D) RID, ORCID
Nakamura, K. (JP)
Staats, E. (CA)
Unno, Y. (JP)Number of authors 13 Article number 164677 Source Title Nuclear Instruments & Methods in Physics Research Section A. - : Elsevier - ISSN 0168-9002
Roč. 986, Jan (2021)Number of pages 6 s. Language eng - English Country NL - Netherlands Keywords HL-LHC ; ATLAS ITk ; micro-strip sensor ; leakage current ; depletion ; strip test Subject RIV BF - Elementary Particles and High Energy Physics OECD category Particles and field physics R&D Projects LTT17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CERN-CZ II - 90104 - Fyzikální ústav AV ČR, v. v. i. Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000594622600008 EID SCOPUS 85092747845 DOI 10.1016/j.nima.2020.164677 Annotation For the construction of the Inner Tracker (ITk) as part of the phase-II upgrade programme of the ATLAS detector or the High-Luminosity (HL) LHC, batches of Long Strip (LS) and Short Strip (SS) n+-in-p type micro-strip sensors have been produced by Hamamatsu Photonics and Infineon. The full size sensors measure approximately 98×98 mm2 and are designed and engineered for tolerance against the 9.7×1014 1 MeV neq/cm2 fluence expected at the HL-LHC, including a safety factor of 1.5. Each sensor has 2 or 4 columns of 1280 individual channels arranged at 75.5 μm horizontal pitch. To ensure the sensors comply with their specifications, a Quality Control (QC) procedure has been implemented, comprising measurements on every individual sensor as well as on a sample basis. Every sensor is subjected to an initial visual inspection, after which the full surface of the sensor is captured with very high resolution by an automated camera setup. Non-contact metrology is performed to obtain the sensor surface profile. Electrical measurements establishing the reverse bias leakage current and depletion voltage are then conducted automatically. Sample sensors from every batch are subjected to 40 h of leakage stability checks in controlled atmosphere, and tests on every channel measuring leakage current, coupling capacitance and bias resistance are done. The recorded results are uploaded to a production database following data quality checks. In this paper, QC test validation data and the compiled results for the first batches of production grade sensors are presented. The QC protocol was validated, and the first production sensors were confirmed to be within specification. The results are compared to those from the previous generation of prototype sensors. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2022 Electronic address https://doi.org/10.1016/j.nima.2020.164677
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