Two-dimensional GEM imaging detector with delay-line readout

摘要

A 100 x 100mm~2 2D imaging detector, based on a triple-GEM gaseous multiplier, striped x ―y readout anode and discrete delay-line readout, is presented. The fast (2. 1ns tap~(-1) ) delay-line circuit was designed to match the anode-charge signal profile, namely its rise-time and length. The detector's imaging capability was systematically studied in Ar/ CO_2 (70/30) with 5.9 keV X-rays; x―y resolution of σ = 0.05 and 0.1 mm for top and bottom anode strips, respectively, and integral non-linearity of ～0.15% are demonstrated.