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Parametric excitation and suppression of drift waves by lower hybrid fields

A.K. Sundaram, P.K. Kaw1973年被引用 46Nuclear FusionIF 3出版社

The effect of a large-amplitude, spatially uniform electric field at lower hybrid frequency, which is applied across the static magnetic field, on the dispersion relations for low-frequency drift waves (ω ≪ ωci) and drift cyclotron waves (ω ≃ ωci) in a collisionless plasma is investigated. It is found that the lower hybrid field can parametrically excite or suppress the drift waves. Expressions are derived for the threshold electric field required for such effects. A particularly interesting result is the possibility of exciting some new macroscopic instabilities when wave-particle resonances are ignored. The results of this investigation are likely to be relevant to some of the recently proposed schemes using lower hybrid waves for heating plasma ions up to fusion temperatures.

日本語訳

静磁場を横切って印加された、低混成周波数における大振幅で空間的に一様な電場が、無衝突プラズマ中の低周波ドリフト波(ω ≪ ωci)およびドリフトサイクロトロン波(ω ≃ ωci)の分散関係に及ぼす影響を調査した。低混成電場がドリフト波をパラメトリックに励起または抑制し得ることが見出された。そのような効果に必要な閾値電場の式を導出した。特に興味深い結果として、波動-粒子共鳴を無視した場合に、いくつかの新しい巨視的不安定性が励起される可能性があることが挙げられる。この調査の結果は、プラズマイオンを核融合温度まで加熱するための低混成波を用いた最近提案されたいくつかの方式に関連する可能性がある。

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