The performance of the GPSC/MSGC hybrid detector with neon-xenon gas mixtures

Abstract

The performance for X-ray spectrometry of neon-xenon gas proportional scintillation counters using a CsI-coated microstrip plate in direct contact with the scintillation gas as a VUV photosensor is investigated for different neon-xenon mixtures. At best operation conditions, the detector gain can reach values about 50% higher than those achieved with pure xenon filling. The highest gains and the best energy resolutions are achieved for xenon contents around 40%. However, the achieved energy resolutions are similar to those achieved with pure xenon. As in pure xenon and argon-xenon mixture gas fillings, the detector performance is limited by optical positive feedback resulting from additional scintillation produced in the electron avalanche processes around the MSP anodes. The best energy resolutions are achieved for positive feedback gains in the range of 1.1 to 1.2. The performance achieved with neon-xenon mixtures is inferior to that achieved with argon-xenon mixtures.Index Terms-CsI-photocathode, gas scintillation counter, microstrip gas chamber (MSGC), X-ray.

Measurement of the photoelectron-collection efficiency in noble gases and methane

“…3 also shows that the photoelectron-collection efficiency in Ne is lower than that for Ar. If the same relative effect is observed for xenon scintillation light, centered at 172 nm, then this could be one of the reasons for the poorer performance obtained with a microstrip-based photosensor operating in Ne-Xe atmospheres [10] when comparing with those obtained in Ar-Xe mixtures [14].…”