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 dem
and 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脳10
15 1 MeV neutron equivalent particles per square centimeter . 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
鈭?). The 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.
Measurements of the signal and signal-to-noise ratio of detectors will be given after the sensors were exposed to radiation that both in fluence 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.