2008/05/14 by A. Bondar, A Bondar, A Buzulutskov +9 · 53 citations
Physics and Astronomy · #Anode #Argon #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Detector #Electrode #Electron multiplier #Gas electron multiplier #Noise (video) #Particle Detector Development and Performance #Resistive touchscreen #physics.ins-det
paper · pdf · doi:10.1088/1748-0221/3/07/p07001
published in Journal of Instrumentation 3(07), P07001 (Institute of Physics) · 11 pages, 19 figures. Submitted to JINST
arxiv created 2008/05/14 · openalex publication_date 2008/07/09 · arxiv updated 2010/03/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The performance of thick GEMs (THGEMs) was compared to that of thin GEMs in two-phase Ar avalanche detectors, in view of their potential application in coherent neutrino-nucleus scattering, dark-matter search and in other rare-event experiments. The detectors comprised a 1 cm thick liquid-Ar layer followed by either a double-THGEM or a triple-GEM multiplier, operated in the saturated vapor above the liquid phase. Three types of THGEMs were studied: those made of G10 and Kevlar and that with resistive electrodes (RETHGEM). Only the G10-made THGEM showed a stable performance in two-phase Ar with gains reaching 3000. Successful operation of two-phase Ar avalanche detectors with either thin- or thick-GEM multipliers was demonstrated at low detection thresholds, of 4 and 20 primary electrons respectively. Compared to the triple-GEM the double-THGEM multiplier yielded slower anode signals; this allowed applying a pulse-shape analysis to effectively reject noise signals. Noise rates of both multipliers were evaluated in two-phase Ar; with detection thresholds of 20 electrons and applying pulse-shape analysis noise levels as low as 0.007 Hz per 1 cm2 of active area were reached.