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Large Debye Distance Effects in a Homogeneous Plasma
KTH, School of Electrical Engineering and Computer Science (EECS). (Fusionsplasmafysik)ORCID iD: 0000-0001-6379-1880
1989 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 41, p. 493-Article in journal (Refereed) Published
Abstract [en]

The classical phenomenon of electron plasma oscillations has been investigated from new aspects. The applicability of standard normal-mode analysis of plasma perturbations has been judged from comparisons with exact numerical solutions to the linearized initial-value problem. We consider both Maxwellian and non-Maxwellian velocity distributions. Emphasis is on perturbations for which α*λD is of order unity, where α is the wavenumber and λD the Debye distance. The corresponding large-Debye-distance (LDD) damping is found to substantially dominate over Landau damping. This limits the applicability of normal-mode analysis of non-Maxwellian distributions. The physics of LDD damping and its close connection to large-Larmor-radius (LLR) damping is discussed. A major discovery concerns perturbations of plasmas with non-Maxwellian, bump-in-tail, velocity distribution functions f0(w). For sufficiently large α*λD (of order unity) the plasma responds by damping perturbations that are initially unstable in the Landau sense, i.e. with phase velocities initially in the interval where df0/dw > 0. It is found that the plasma responds through shifting the phase velocity above the upper velocity limit of this interval. This is shown to be due to a resonance with the drifting electrons of the bump, and explains the Penrose criterion.

Place, publisher, year, edition, pages
1989. Vol. 41, p. 493-
National Category
Natural Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-240864DOI: 10.1017/S0022377800014045OAI: oai:DiVA.org:kth-240864DiVA, id: diva2:1275182
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QCR 20190128

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-28Bibliographically approved

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Publisher's full texthttps://www.cambridge.org/core/journals/journal-of-plasma-physics/article/large-debye-distance-effects-in-a-homogeneous-plasma/C03E0A440D70FFA5B139C06715584634

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