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Ponderomotive stabilization of interchange modes at ICRF heating

I A Kotelnikov, S G Yakovchenko1994年Plasma Physics and Controlled FusionIF 2.2出版社

The ponderomotive stabilization of plasma in an axisymmetric mirror device is considered. It is assumed that (i) the RF field is excited by a full-turn-loop antenna and (ii) its frequency is below the eigenfrequency spectrum of the plasma column. It is shown that the dissipation of the RF power drives an instability that originates from a resonant-particle interaction. This instability is weak except for the case when the minority ion scheme of ICRF heating is used. However, even in the latter case, the resonant-particle instability can be suppressed by quasilinear diffusion of the minority ions in the velocity space at a sufficiently high level of RF power. With the instability suppressed, a simple criterion for the ponderomotive force to stabilize flute perturbations in mirror plasmas is obtained.

日本語訳

軸対称ミラー装置におけるプラズマのポンデロモーティブ安定化について考察する。(i)RF場が全周ループアンテナによって励起され、(ii)その周波数がプラズマ柱の固有振動数スペクトルより低いと仮定する。RFパワーの散逸が、共鳴粒子相互作用に起因する不安定性を駆動することが示される。この不安定性は、ICRF加熱の少数イオン方式を用いる場合を除いて弱い。しかしながら、後者の場合でも、十分に高いRFパワーレベルでの少数イオンの速度空間における準線形拡散により、共鳴粒子不安定性は抑制され得る。不安定性が抑制された状態で、ミラー装置におけるフルート摂動を安定化するためのポンデロモーティブ力に関する簡潔な条件が得られる。

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