Thin gap parallel mesh chamber: a sparkless high-rate detector
P. Fonte, R. Ferreira-Marques, Y. Ivaniouchenkov, V. Peskov, A. Policarpo
Abstract
In this work we describe a parallel geometry gaseous detector constituted by a thin (0.6 mm) amplifying gap preceded by a drift region. The gap is delimited by a metal plate and by a wire mesh. The detector can count up to a rate of 107 Hz/mm2 at gain 1000 and retains at lower counting rates the high gains (close to 106) that are typical of parallel geometry detectors. Additionally it was found that in the thin amplifying gap the discharges seem to be self-quenched and that full sparks do not develop. This fact, together with the robustness of the electrode materials, makes this an extremely resilient high-rate detector.
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