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Radiation hardness of small-pitch 3D pixel sensors up to HL-LHC fluences (1707.01045v1)
Published 4 Jul 2017 in physics.ins-det and hep-ex
Abstract: A new generation of 3D silicon pixel detectors with a small pixel size of 50$\times$50 and 25$\times$100 $\mu$m${2}$ is being developed for the HL-LHC tracker upgrades. The radiation hardness of such detectors was studied in beam tests after irradiation to HL-LHC fluences up to $1.4\times10{16}$ n$_{\mathrm{eq}}$/cm$2$. At this fluence, an operation voltage of only 100 V is needed to achieve 97% hit efficiency, with a power dissipation of 13 mW/cm$2$ at -25${\circ}$C, considerably lower than for previous 3D sensor generations and planar sensors.