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Boundary Larmor Radius Effect on Electrostatic Waves
(Fusionsplasmafysik)ORCID iD: 0000-0001-6379-1880
1991 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. B3, p. 3013-Article in journal (Refereed) Published
Abstract [en]

The linearized Vlasov–Poisson equations, which combine to an integrodifferential equation for the perturbed electric potential, are used to investigate the effect of finite plasma size on the stability of electrostatic waves in a homogeneous plasma slab. The distortion of the gyromotion of the particles at the plasma boundary influences wave stability, a phenomenon termed the boundary Larmor radius (BLR) effect. The integrodifferential equation, treated as an eigenvalue problem, is discretized into a matrix dispersion equation by use of the Galerkin method and is then solved numerically. It is found that the ion Bernstein wave,which is undamped in an infinite homogeneous plasma, now becomes damped with a maximum damping rate of 0.35 ωci at rG/L (ion Larmor radius over wall distance)≊0.15. In general, the damping is less pronounced at shorter perpendicular wavelengths. It implies a necessity to take into account the BLR effect in the kinetic stability studies for sufficiently large ion Larmor radius in comparison to the characteristic dimension.

Place, publisher, year, edition, pages
1991. Vol. B3, p. 3013-
National Category
Natural Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-240862DOI: 10.1063/1.859779OAI: oai:DiVA.org:kth-240862DiVA, id: diva2:1275176
Note

QCR 20190109

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-09Bibliographically approved

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