Theory of plasma heating by magnetosonic cavity mode absorption
作者:
Edward Ott,
Jean‐Marie Wersinger,
Paul T. Bonoli,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1978)
卷期:
Volume 21,
issue 12
页码: 2306-2315
ISSN:0031-9171
年代: 1978
DOI:10.1063/1.862181
出版商: AIP
数据来源: AIP
摘要:
Absorption of magnetosonic cavity modes by excitation of the spatial Alfve´n resonance and by resonant particle absorption (transit time magnetic pumping) are studied and the strengths of the two damping mechanisms compared. For the mode studied, the poloidal mode number is low. This implies that the magnetosonic turning point is close to the Alfve´n resonance. To deal with the resulting differential equation an asymptotic expansion technique is utilized, first using ideal magnetohydrodynamic equations, and, subsequently, with finite ion Larmor radius effects included. The antenna impedance and cavityQare studied as a function of plasma and antenna parameters. It is found that either Alfve´n resonance or resonant particle absorption dominate depending principally on radial mode number.
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