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Kinetic Longitudinal Eigenmodes for an Inhomogeneous Plasma Diode with Resolved Sheaths Using a Landau Analogy
KTH, Superseded Departments, Alfvén Laboratory.
2000 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 7, 481-492 p.Article in journal (Refereed) Published
Abstract [en]

Electrostatic waves in strongly inhomogeneous systems are analyzed using initial value formulations of the kinetic equations. The method resolves the gradual reflection in a trapped electron population, the successive acceleration of a kinetic beam, and it includes the outer circuit. The regularity of the electric field in the sheaths turns out to be crucial. At the turning points for closed trajectories, representing particles with a circulation time that is an integer number of inverse wave frequencies, it is shown that weak oscillating double charge layers can form. This phenomenon does not exist for homogeneous systems, since the structures rest on particle reflection. The final equations are solved numerically to illustrate the technique. Resonant damping and the singular space charge structures in the sheaths are the main differences compared with inhomogeneous fluid theory.

Place, publisher, year, edition, pages
2000. Vol. 7, 481-492 p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-95054DOI: 10.1063/1.873833ISI: 000084822700010OAI: diva2:526466
QC 20120619Available from: 2012-05-11 Created: 2012-05-11 Last updated: 2012-06-19Bibliographically approved

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Löfgren, Torbjörn
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