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Signal and charge collection efficiency of n-in-p strip detectors after mixed irradiation to HL-LHC fluences

: Kuehn, S.; Barber, T.; Casse, G.; Dervan, P.; Driewer, Adrian; Forshaw, D.; Huse, T.; Jakobs, K.; Parzefall, U.


Nuclear instruments and methods in physics research, Section A. Accelerators, spectrometers, detectors and associated equipment 730 (2013), S.58-61
ISSN: 0167-5087
ISSN: 0168-9002
International Conference on Radiation Effects on Semiconductor Materials Detectors and Devices (RESMDD) <9, 2012, Florence>
Zeitschriftenaufsatz, Konferenzbeitrag
Fraunhofer IMS ()
silicon particle detector; radiation damage; mixed irradiation; charge collection efficiency

For the year 2020, an upgrade of the LHC with a factor ten increase in luminosity is planned. The resulting severe radiation doses for the ATLAS tracker demand extremely radiation tolerant detectors. In this study six planar n-in-p strip sensors produced by Hamamatsu Photonics were irradiated in consecutive irradiation steps with pions of 280 Mev/c, protons of 25 Mev/c and reactor neutrons resulting in a combined fluence of up to 3×1015 1 MeV neutron equivalent particles per square centimeter (neq / cm2). This particle composition and fluence corresponds to the qualification limit specified by the ATLAS experiment for the outer pixel layers (assuming an integrated luminosity of 3000 fb-1). The 320 µm thick devices are investigated using electrons from a 90Sr source. After each irradiation step both charge collection efficiency and noise measurements have been performed using the ALIBAVA readout system, which is based on analogue Beetle ASICs clocked at 40 MHz. Measurement of the signal and signal-to-noise ratio of detectors will be given after the sensors were exposed to radiation that both influence and composition are corresponding to the expectations for the HL-LHC trackers. Conclusions will be drawn on their operation in the ATLAS inner detector upgrade.