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Global MHD modes excited by energetic ions in heliotron/torsatron plasmas

K. Toi, M. Takechi, S. Takagi, G. Matsunaga, M. Isobe, T. Kondo, M. Sasao, D.S. Darrow, K. Ohkuni, S. Ohdachi1999年被引用 17Nuclear FusionIF 3出版社

Fishbone-like burst modes (FBs) and toroidal Alfvén eigenmodes (TAEs) excited by energetic ions were observed for the first time in CHS heliotron/torsatron plasmas heated by co-injected neutral beams, where the rotational transform is increased by the induced beam driven current. FBs of m = 3/n = 2 (where m, n are the poloidal and toroidal mode numbers) induce a pulsed increase in the energetic ion loss flux. FBs of m = 2/n = 1 induce sawtooth oscillations in the latter half of a discharge where the plasma β becomes high. Only when the beam velocity exceeds about half of the central Alfvén velocity and the net plasma current is induced to the required level are TAEs with n = 1 and n = 2 excited; these are localized in the plasma core region, where the magnetic shear is appreciably reduced by the net plasma current. So far, TAE induced energetic ion loss has not been observed.

日本語訳

魚骨状バースト(FB)および高エネルギーイオンによって励起されたトロイダル・アルフヴェン固有モード(TAE)が、同軸中性粒子ビーム加熱によるヘリオトロン/トルサトロン装置CHSにおいて初めて観測された。ここで、回転変換は誘起されたビーム駆動電流によって増加する。m = 3/n = 2(m、nはそれぞれポロイダルおよびトロイダルモード数を表す)のFBは、高エネルギーイオン損失束のパルス状の増加を誘起する。m = 2/n = 1のFBは、プラズマβが高くなる放電後半においてサソイド振動を誘起する。ビーム速度が中心アルフヴェン速度の約半分を超え、かつ正味のプラズマ電流が必要なレベルまで誘起された場合にのみ、n = 1およびn = 2のTAEが励起される。これらのTAEは、正味のプラズマ電流によって磁気シアが著しく低減されるプラズマコア領域に局在する。これまでのところ、TAEによって誘起された高エネルギーイオン損失は観測されていない。

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MagnetohydrodynamicsEnergetic ionHeliotronMHD modes
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