Gain limits of a Thick GEM in high-purity Ne, Ar and Xe

Details Gain limits of a Thick GEM in high-purity Ne, Ar and Xe Gain limits of a Thick GEM in high-purity Ne, Ar and Xe

2010-01-26

arxiv.org/abs/1001.4741v1

Physics

Instrumentation and Detectors

15 pages, 6 figures, submitted to JINST

Scientific paper

The dependence of the avalanche charge gain in Thick Gas Electron Multipliers (THGEM) on the purity of Ne, Ar and Xe filling gases was investigated. The gain, measured with alpha-particles in standard conditions (atmospheric pressure, room temperature), was found to considerably drop in gases purified by non-evaporable getters. On the other hand, small N2 admixtures to noble gases resulted in high reachable gains. The results are of general relevance in the operation of gas-avalanche detectors in noble gases, particularly that of two-phase cryogenic detectors for rare events.

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