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Author Ding, N. ♦ Huang, L. ♦ Qiu, X. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION ♦ MEDIUM-BETA PLASMA ♦ ALFVEN WAVES ♦ TOKAMAK DEVICES ♦ ALPHA PARTICLES ♦ DISPERSION RELATIONS ♦ MODE CONVERSION ♦ ION ACOUSTIC WAVES ♦ LANDAU DAMPING ♦ THERMONUCLEAR REACTIONS
Abstract In this paper, a model for the kinetic Alfv{acute e}n wave (KAW) in the presence of fusion alphas is established. The finite-{beta} (relative to low {beta}) and alpha particle effects on KAW are investigated. In this model, ion sound, transit time magnetic pumping (TTMP), the response of alpha particles (alphas), and those effects considered by preceding authors are included. In cylindrical geometry, a set of three second-order differential equations in {ital r} for the perturbed fields {ital E}{sub {ital r}}, {ital E}{sub {perpendicular}}, and {ital E}{sub {parallel}} is numerically solved. A dispersion relation of the Alfv{acute e}n wave in the fusion tokamak plasma is derived. The mode conversion and the energy deposition are qualitatively discussed on the basis of this relation. Both the analytical and numerical analyses indicate that (i) no matter whether {ital m} (poloidal mode number) is positive [N. Ding {ital et} {ital al}., Phys. Plasmas {bold 2}, 1529 (1995)] or negative (mainly studied in the present paper), the alphas do not affect the compressional Alfv{acute e}n wave, but they do affect the KAW evidently; (ii) for {ital m}{lt}0, it is preferable to choose the frequency {omega} of the injected wave so that the inequality {omega}{approx_gt}({ital P}{sub {ital m}{plus_minus}1}/{ital R}{sub {ital m}{plus_minus}1}){sup {minus}1}{omega}{sub {asterisk}{alpha}{ital m}} holds for optimal power absorption. The energy deposition at the resonant position close to the interior of the fusion tokamak plasma in taking account of the effects of ion sound and TTMP is less than that without taking account of these effects. But for the same {beta} value, at the position adjacent to the edge the contrary is the case. For a certain resonant position, as the {beta} value increases, the energy deposition decreases. {copyright} {ital 1996 American Institute of Physics.}
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Journal Physics of Plasmas
Volume Number 3
Issue Number 6


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