Scanning drift tube measurements of electron transport parameters in different gases: argon, synthetic air, methane and deuterium

Korolov, Ihor and Vass, Máté and Donkó, Zoltán (2016) Scanning drift tube measurements of electron transport parameters in different gases: argon, synthetic air, methane and deuterium. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 49. p. 415203. ISSN 0022-3727

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Abstract

Measurements of transport coef cients of electrons in a scanning drift tube apparatus are reported for different gases: argon, synthetic air, methane and deuterium. The experimental system allows the spatio-temporal development of the electron swarms (‘swarm maps’) to be recorded and this information, when compared with the pro les predicted by theory, makes it possible to determine the ‘time-of- ight’ transport coef cients: the bulk drift velocity, the longitudinal diffusion coef cient and the effective ionization coef cient, in a well-de ned way. From these data, the effective Townsend ionization coef cient is determined as well. The swarm maps provide, additionally, direct, unambiguous information about the hydrodynamic/ non-hydrodynamic regimes of the swarms, aiding the selection of the proper regions applicable for the determination of the transport coef cients.

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