We present a new design and assembly procedure of a
large-area gas-avalanche Resistive-Plate WELL (RPWELL) detector. A
50 × 50 cm2 prototype was tested in
80 GeV/c muon beam at CERN-SPS, presenting improved
performances compared to previous ones: MIP detection efficiency
over 96% with 3% uniformity across the entire detector area, a
charge gain of ≈ 7.5 × 103 with a uniformity of 22%,
and discharge probability below 10-6 with a few single
hotspots attributed to production imperfections. These results pave
the way towards further up-scaling detectors of this kind.
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