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

I. Korolov, M. Vass, Z. Donkó

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Measurements of transport coefficients 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 profiles predicted by theory, makes it possible to determine the 'time-of-flight' transport coefficients: the bulk drift velocity, the longitudinal diffusion coefficient and the effective ionization coefficient, in a well-defined way. From these data, the effective Townsend ionization coefficient 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 coefficients.

Original languageEnglish
Article number415203
JournalJournal of Physics D: Applied Physics
Volume49
Issue number41
DOIs
Publication statusPublished - Sep 13 2016

Fingerprint

Argon
Deuterium
Methane
Ionization
deuterium
ionization coefficients
methane
transport properties
Gases
argon
tubes
Scanning
scanning
Electrons
air
Air
gases
electrons
Hydrodynamics
diffusion coefficient

Keywords

  • drift tube
  • electron swarm
  • transport coefficients

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

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AB - Measurements of transport coefficients 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 profiles predicted by theory, makes it possible to determine the 'time-of-flight' transport coefficients: the bulk drift velocity, the longitudinal diffusion coefficient and the effective ionization coefficient, in a well-defined way. From these data, the effective Townsend ionization coefficient 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 coefficients.

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