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Observations of temporal and spatial behaviour of plasmas in relation to the interchange stability boundary scaling in GAMMA 10

R Minami, T Cho, J Kohagura, M Hirata, T Numakura, H Watanabe, M Yoshida, Y Nakashima, M Ichimura, T Tamano2002年Plasma Physics and Controlled FusionIF 2.2出版社

Observations of internal core plasma structural behaviour during the magnetohydrodynamic (MHD) destabilization of the central cell plasmas are carried out by the use of our developed semiconductor x-ray detector arrays installed in both central cell and anchor regions of the GAMMA 10 tandem mirror. In the present paper, it is found from the developed x-ray diagnostics that the bulk plasmas rotate without a change in its shape and structure with an E×B velocity during the destabilization. The onset of the off-axis rotation is identified to be closely related to a scaling of the MHD stability boundary (i.e. the anchor beta requirements for stabilizing central cell hot ion plasmas). These data confirm pressure driven interchange instability in tandem mirror plasmas, and reveal the rigid rotational bulk plasma structure as the first demonstrated interior plasma property during the destabilization.

日本語訳

GAMMA 10タンデムミラーの中心セル領域およびアンカー領域の両方に設置した、我々が開発した半導体X線検出器アレイを用いて、中心セルプラズマの磁気流体力学(MHD)不安定化中の内部コアプラズマ構造挙動の観測を実施した。本論文では、開発したX線診断法により、バルクプラズマが不安定化中にその形状および構造を変化させることなくE×B速度で回転することが見出された。オフアクシス回転の開始は、MHD安定性境界のスケーリング(すなわち、中心セル高温イオンプラズマを安定化するためのアンカーベータ要件)と密接に関連することが特定された。これらのデータは、タンデムミラープラズマにおける圧力駆動型交換不安定性を確認し、不安定化中に実証された最初の内部プラズマ特性として、剛体回転バルクプラズマ構造を明らかにするものである。

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