Drift velocity and gain in argon- and xenon-based mixtures

Details Drift velocity and gain in argon- and xenon-based mixtures Drift velocity and gain in argon- and xenon-based mixtures

2004-02-09

arxiv.org/abs/physics/0402044v1

Nucl.Instrum.Meth.A523:302-308,2004

Physics

Instrumentation and Detectors

11 pages, 7 figures, accepted for publication in Nucl.Instrum.Meth. A. Data files available at http://www-alice.gsi.de/trd

Scientific paper

10.1016/j.nima.2003.11.426

We present measurements of drift velocities and gains in gas mixtures based on Ar and Xe, with CO2, CH4, and N2 as quenchers, and compare them with calculations. In particular, we show the dependence of Ar- and Xe-CO2 drift velocities and gains on the amount of nitrogen contamination in the gas, which in real experiments may build up through leaks. A quantification of the Penning mechanism which contributes to the Townsend coefficients of a given gas mixture is proposed.

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