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  • Alviggi, M.G.; Biglietti, M.; Pietra, M. Della; Donato, C. Di; Farina, E.; Franchino, S.; Iengo, P.; Iodice, M.; Petrucci, F.; Rossi, E.; Sekhniaidze, G.; Sidiropoulou, O.; Vecchio, V.

    2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2017-Oct.
    Conference Proceeding

    We present here the development of resistive Micromegas with O(mm 2 ) pad readout aiming at improving the high rate capability of the detector. The goal application is precision tracking in high rate environment without efficiency loss up to few MHz/cm 2 . In the proposed layout, small anode pads are overlayed by an insulating layer with a pattern of resistive pads on top. The readout and resistive pads are connected by intermediate resistors embedded in the insulating layer. A first prototype has been constructed at CERN and thoroughly tested. It consists of a 48x16 matrix of 0.8x2.8 mm 2 rectangular pads with a pitch of 1 and 3 mm in the two coordinates. The active surface is 4.8x4.8 cm 2 with a total number of 768 channels read-out by 6 APV-25 chips. The drift and amplification gaps of this Micromegas prototype are 5 mm and 128 \mu \mathrm{m}, respectively. The detector is operated with an Ar/CO2 (93:7) gas mixture. Characterization and performance studies of the detector have been carried out by means of radioactive sources, X-Rays and test beam.