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Nonlinear parametric phenomena in plasma during radio frequency heating in the ion cyclotron frequency range

K N Stepanov1996年Plasma Physics and Controlled FusionIF 2.2出版社

Parametric phenomena in plasma which occur due to varying electric fields with the ion cyclotron frequency are reviewed. Beam-like lower hybrid instability emerges in strong pumping fields provided that the transverse relative velocity of particles is larger than the ion thermal speed . The resulting turbulence and the following numerous manifestations observed experimentally are addressed. The turbulence may prove important for experiments aimed at plasma production or radio frequency (RF) cleaning of metallic surfaces of vacuum chambers in stellarators, tokamaks and helicon devices. In contrast, for a weak field the kinetic parametric instabilities of ion cyclotron oscillations arise due to electrons. The issues of the turbulence, mathematical modelling, its role in turbulent heating observed on the torsatron Uragan-3M, decay instabilities associated with ion cyclotron oscillations and the triggering of ion quasimodes are considered.

日本語訳

イオンサイクロトロン周波数を持つ変動電場によって生じるプラズマ中のパラメトリック現象を概説する。粒子の横方向相対速度がイオン熱速度よりも大きい場合、強いポンピング場において低混成不安定性が出現する。結果として生じる乱流と、その後実験的に観測される多様な現象について考察する。この乱流は、ステラレーター、トカマク、ヘリコンプラズマにおけるプラズマ生成や、金属壁の高周波(RF)クリーニングを目的とした実験にとって重要となり得る。一方、弱い場の場合、イオンサイクロトロン振動の運動論的不安定性は電子に起因して生じる。乱流の問題、数値モデリング、トルサトロンUragan-3Mで観測された乱流加熱におけるその役割、イオンサイクロトロン振動に伴う崩壊不安定性、およびイオン準モードの励起について考察する。

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