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Interaction of a test particle with a magnetized plasma

Published online by Cambridge University Press:  13 March 2009

E. W. Liang  and
A. L. Gibson
E. W. Liang
Affiliation:
Department of Natural Philosophy, University of Glasgow
A. L. Gibson
Affiliation:
Department of Natural Philosophy, University of Glasgow
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Abstract

In the presence of a sufficiently strong magnetic field, the shielding of a test particle in a two-dimensional Vlasov plasma disappears. An intermediate regime is investigated, for both a stationary and a moving test particle, in which the plasma frequency ωp and the cyclotron frequency ωc are of the same order of magnitude. In the case of a stationary test particle, this intermediate regime is approximately in the range ½ ≤ a ≤ 2, where a = ωp/ωc. For a < ½, only partial shielding occurs, the potential retaining its vacuum logarithmic dependence. For a < 2, the potential approximates to the field-free case, and falls off exponentially. For a test particle moving at electron thermal speed, the typical bow wave and wake phenomenon, associated with an unmagnetized plasma, is no longer present. We find, instead, that the potential possesses upstream—downstream symmetry.

Type
Research Article
Information
Journal of Plasma Physics , Volume 14 , Issue 3 , December 1975 , pp. 433 - 441
Copyright
Copyright © Cambridge University Press 1975

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References

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