Fd. Vandenberg et al., GAS GAIN STABILITY IN MSGCS AND MGCS AT HIGH-RATE OPERATION, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 392(1-3), 1997, pp. 94-98
MicroStrip Gas Counters (MSGCS) with strip patterns on bare and coated
borosilicate glass as well as MicroGap Counters (MGCs) have been irra
diated with 5.4 keV X-rays to investigate their high rate capability a
nd ageing behaviour. The application of semiconductive coatings under
the strips of MSGCs results in an improved short-and long-term gain st
ability in comparison to counters with uncoated borosilicate substrate
s, for count rates up to 10(5) Hz/mm(2). However, the absolute gain of
a coated detector is significantly smaller than that of a conventiona
l one. The MGC has high-rate characteristics, as good as those for coa
ted MSGCs. Results on the ageing of MSGCs on coated and uncoated glass
, and of the MGC, are presented.