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Effects of transition particles on plasma instabilities in a quasi-isodynamic stellarator

V S Marchenko, S N Reznik2016年Plasma Physics and Controlled FusionIF 2.2出版社

We consider the impact of transition particles on the Alfvén waves and electrostatic trapped ion modes in a stellarator with closed contours of the second adiabatic invariant, which do not perfectly coincide with magnetic surfaces (a so-called quasi-isodynamic (QI) stellarator). Due to orbit transitions, the damping rate of Alfvén eigenmodes on localized electrons becomes independent of the collision frequency in the broad range of low-collision rates. Dissipative trapped ion modes (Kadomtsev–Pogutse (KP) modes) induced by the ion temperature gradient (ITG) are strongly stabilized by collisionless orbit transitions.

日本語訳

我々は、第二断熱不変量の閉曲線が磁気面と完全には一致しない(いわゆる準等力学(QI)ステラレーター)における、遷移粒子がアルヴェーン波および静電捕捉イオンモードに及ぼす影響を考察する。軌道遷移により、アルヴェーン固有モードの減衰率は、低衝突頻度の広い範囲において衝突周波数に依存しなくなる。イオン温度勾配(ITG)によって誘起される散逸性捕捉イオンモード(カドムツェフ–ポグツェ(KP)モード)は、無衝突軌道遷移によって強く安定化される。

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