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

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arxiv physics/0402044 v1 pith:MUWZRQZF submitted 2004-02-09 physics.ins-det

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

classification physics.ins-det
keywords driftgainsmixturesvelocitiesamountargon-buildcalculations
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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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