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Abstract: The performance of thick GEMs THGEMs was compared to that of thin GEMs intwo-phase Ar avalanche detectors, in view of their potential application incoherent neutrino-nucleus scattering, dark-matter search and in otherrare-event experiments. The detectors comprised a 1 cm thick liquid-Ar layerfollowed by either a double-THGEM or a triple-GEM multiplier, operated in thesaturated vapor above the liquid phase. Three types of THGEMs were studied:those made of G10 and Kevlar and that with resistive electrodes RETHGEM. Onlythe G10-made THGEM showed a stable performance in two-phase Ar with gainsreaching 3000. Successful operation of two-phase Ar avalanche detectors witheither thin- or thick-GEM multipliers was demonstrated at low detectionthresholds, of 4 and 20 primary electrons respectively. Compared to thetriple-GEM the double-THGEM multiplier yielded slower anode signals; thisallowed applying a pulse-shape analysis to effectively reject noise signals.Noise rates of both multipliers were evaluated in two-phase Ar; with detectionthresholds of 20 electrons and applying pulse-shape analysis noise levels aslow as 0.007 Hz per 1 cm2 of active area were reached.



Autor: A. Bondar, A. Buzulutskov, A. Grebenuk, D. Pavlyuchenko, Y. Tikhonov, A. Breskin

Fuente: https://arxiv.org/







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