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Motohashi, K.; Kubota, T.; Nakamura, K.; Hori, R.; Gallrapp, C.; Unno, Y.; Jinnouchi, O.; Altenheiner, S.; Arai, Y.; Hagihara, M.; Backhaus, M.; Bomben, M.; Forshaw, D.; George, M.; Hanagaki, K.; Hara, K.; Hirose, M.; Ikegami, Y.; Ishijima, N.; Jentzsch, J.; Kawagoe, K.; Kimura, N.; Kono, T.; Macchiolo, A.; Nishimura, R.; Oda, S.; Otono, H.; Rubinskiy, I.; Rummler, A.; Takashima, R.; Takubo, Y.; Teoh, J.J.; Terada, S.; Todome, K.; Tojo, J.; Usui, J.; Weigell, P.; Weingarten, J.; Yamaguchi, D.; Yorita, K.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 11/2014, Letnik: 765Journal Article
Various structures for n-in-p planar pixel sensors have been developed at KEK in order to cope with the huge particle fluence in the upcoming LHC upgrades. Performances of the sensors with different structures have been evaluated with testbeam. The n-in-p devices were connected by bump-bonding to the ATLAS Pixel front-end chip (FE-I4A) and characterized before and after the irradiation to 1×1016 1MeV neq/cm2. Results of measurements with 120GeV/c momentum pion beam at the CERN Super Proton Synchrotron (SPS) in September 2012 are presented. •Pixel sensors with two biasing and two isolation structures were evaluated.•Overall hit efficiency of 97.6% was confirmed at −1200V after 1×1016neq/cm2.•Inefficiency regions were observed in non-irradiated samples with P-spray isolation.•Inefficiency regions after high irradiation were observed under bias rail and PolySi.•The potential of the surface structure is thought to affect the charge collection.
