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Expansion of a multicomponent current-carrying plasma jet into vacuum

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Abstract

An expression for the ion−ion coupling in a multicomponent plasma jet is derived for an arbitrary ratio between the thermal and relative velocities of the components. The obtained expression is used to solve the problem on the expansion of a current-carrying plasma microjet emitted from the cathode surface into vacuum. Two types of plasmas with two ion components are analyzed: (i) plasma in which the ion components of equal masses are in the charge states Z 1= +1 and Z 2= +2 and (ii) plasma with ions in equal charge states but with the mass ratio m 1/m 2 = 2. It is shown that, for such plasmas, the difference between the velocities of the plasma components remains substantial (about 10% of the average jet velocity in case (i) and 15% in case (ii)) at distances of several centimeters from the emission center, where it can be measured experimentally, provided that its initial value at the emitting cathode surface exceeds a certain threshold. This effect is investigated as a function of the mass ratio and charge states of the ion components.

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Authors and Affiliations

  1. Irkutsk State University, Irkutsk, 664003, Russia

    V. I. Krasov & V. L. Paperny

Authors
  1. V. I. Krasov
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  2. V. L. Paperny
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Correspondence to V. L. Paperny.

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Original Russian Text © V.I. Krasov, V.L. Paperny, 2017, published in Fizika Plazmy, 2017, Vol. 43, No. 3, pp. 241–249.

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Krasov, V.I., Paperny, V.L. Expansion of a multicomponent current-carrying plasma jet into vacuum. Plasma Phys. Rep. 43, 298–306 (2017). https://doi.org/10.1134/S1063780X17030072

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  • DOI: https://doi.org/10.1134/S1063780X17030072

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