Electrostatic double layers and a plasma evacuation process

Details Electrostatic double layers and a plasma evacuation process Electrostatic double layers and a plasma evacuation process

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..74..189r&link_type=abstract

Astrophysics and Space Science, vol. 74, no. 1, Jan. 1981, p. 189-206. Research supported by the Swedish Board for Space Activi

Astronomy and Astrophysics

Astrophysics

24

Electrostatics, Magnetohydrodynamic Stability, Plasma Density, Plasma Layers, Cold Plasmas, Finite Difference Theory, Nonlinear Systems, Plasma Waves

Scientific paper

An evacuation process due to the growth of current driven instabilities in a plasma is discussed. The process, which leads to localized extreme density reductions, is related to the formation of electrostatic double layers. The initial linear phase is treated using the superposition of unstable plasma waves. In the long wavelength, nondispersive limit, a density dip - which is initially present as a small disturbance - grows rapidly and remains localized in the plasma. The process works for a variety of plasma conditions provided a certain current density is exceeded. For a particular choice of plasma parameters the nonlinear development is followed, by solving the coupled Vlasov-Poisson equations by finite difference methods. The evacuation process is found to work even more effectively in the nonlinear phase and leads to an extreme density reduction within the dip. It is suggested that the growth of such structures produces weak points within the plasma that can lead to the formation of double layers.

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