Preferential electron‐cyclotron heating of hot electrons and formation of overdense plasmas
作者:
B. H. Quon,
R. A. Dandl,
期刊:
Physics of Fluids B: Plasma Physics
(AIP Available online 1989)
卷期:
Volume 1,
issue 10
页码: 2010-2017
ISSN:0899-8221
年代: 1989
DOI:10.1063/1.859064
出版商: AIP
数据来源: AIP
摘要:
Three electron‐cyclotron‐heating techniques, which preferentially couple microwave power to different energy segments of the electron distribution function, have been experimentally investigated in the AMPHED facility [C. Bodeldijk, Special Supplement, Nucl. Fusion26, 184 (1986)]. Whistler waves launched from the high‐field mirror throat are strongly absorbed in a single pass across the resonant interaction layer, producing highly overdense cold background plasma but no relativistic hot particles. On the other hand, ordinary waves launched from the system side wall are only weakly damped, giving rise to local cylindrical cavity modes and preferential coupling to hot electrons in the 100 keV region. Low levels (≤5%) of upper‐off‐resonance heating power were shown to be most effective for preferential hot‐electron plasma formation, with ∼100% of the injected power being absorbed by the energetic electrons.
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