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Dynamic measurement of the electron velocity distribution in rarefied, weakly ionized argon

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Abstract

An experimental technique for the diagnosis of rarefied ionized gases has been developed. The source of the ionized gas is formed by the region behind the reflected shock in a shock tube from which it is expanded through a nozzle. This flow is sampled by an adjustable skimmer forming a molecular beam. The velocity of the electrons on the centerline of the beam is analyzed in a magnetic field and registered by an electron multiplier. By sweeping the intensity of the field during the test time the whole range of the velocity distribution is scanned. The geometric dimensions of nozzle and skimmer together with the characteristic of the analyzer allow to neglect the divergence of the flow in the evaluation of the distribution. Comparisons of evaluated electron temperatures show good agreement with a theoretically predicted temperature decay in an expansion flow.

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Author notes

  1. H. J. Thor

    Present address: Fraunhofer-Institut für Kurzzeitdynamik, Ernst-Mach-Institut, Außenstelle, Weil am Rhein, Germany

Authors and Affiliations

  1. Stoßwellenlabor, Institut für Luft- und Raumfahrt, Rheinisch-Westfälische Technische Hochschule, Templergraben, D-5100, Aachen, Germany

    H. J. Thor & H. Grönig

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  1. H. J. Thor
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  2. H. Grönig
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Thor, H.J., Grönig, H. Dynamic measurement of the electron velocity distribution in rarefied, weakly ionized argon. Experiments in Fluids 2, 42–46 (1984). https://doi.org/10.1007/BF00266317

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  • DOI: https://doi.org/10.1007/BF00266317

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