Annealing studies of irradiated p-type sensors designed for the upgrade of ATLAS phase-II strip tracker

Journal Article · Mon Oct 01 00:00:00 EDT 2018 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2018.10.014· OSTI ID:1480142

Wiik-Fuchs, L.; Diehl, L.; Mori, R.; Hauser, M.; Jakobs, K.; Kühn, S.; Parzefall, U.; Affolder, A. A.; Fadeyev, V.; García, C.; Lacasta, C.; Madaffari, D.; Soldevila, U.; Unno, Y.

The upgrade of the LHC to the High Luminosity LHC will challenge the silicon strip detector performance with high fluence and long operation time. Sensors have been designed and tests on charge collection and electrical performance have been carried out in order to evaluate their behaviour. Besides that, it is important to understand and predict the long-term evolution of the sensor properties. In this work, detailed studies on the annealing behaviour of ATLAS12 strip sensors designed by the ITK Strip Sensor Working Group and irradiated from 5 x 10¹³ n_eq cm^-2 to 2 x 10¹⁵ n_eq cm^-2 are presented. Systematic charge collection and leakage current measurements have been carried out during the annealing process until break-down or the appearance of charge multiplication. The annealing was carried out, separating the sensors into two groups being either annealed at 23 °C or 60 °C. Sensors showing charge multiplication have been then kept at high voltage for a long time in order to monitor their stability. The difference in the annealing behaviour between the two temperatures has been analysed and compared to similar measurements on n-type sensors and with a theoretical model. From the impedance measurements for the samples irradiated to low fluences it was possible to extract the effective doping concentration. This was compared to similar measurements on n-type sensors and with a theoretical model.

• Research Organization: Univ. of California, Santa Cruz, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: SC0010107
• OSTI ID: 1480142
• Alternate ID(s): OSTI ID: 1611351; OSTI ID: 1636232
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

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