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Rotation of edge fluctuations in a high beta , low q tokamak plasma

H. Kiyama, S. Kiyama1996年被引用 1Nuclear FusionIF 3出版社

The toroidal and poloidal rotations of edge magnetic fluctuations in a high beta , low q tokamak plasma ( beta p>or=1,qI<2), which has a specific q profile and is self-organized through a relaxation process, and the role of the rotations for the relaxation to a stable state are investigated. The magnetic deformation starts rotating at the initial relaxation process when the plasma relaxes to a toroidally symmetric plasma. In the stable relaxed state, ballooning-like magnetic deformations rotate nearly along the magnetic lines of force. The bulk plasma rotates with the deformations. The rotation is also accelerated by each relaxation process. In this experiment, the low q plasma in the relaxed state (qI<2) is associated with plasma rotation both in the toroidal and poloidal directions, which suppresses the magnetic fluctuations, and with beta P higher than a critical value. This enables a broad pressure profile with a sharp edge density gradient, which is inherent in the high beta relaxed plasma, to be realized and the confinement to be improved. The rotation speed becomes higher with these effects, and finally the high beta relaxed state is established. The series of phenomena occurring here resembles the L-H transition

日本語訳

特定のq分布を持ち、緩和過程を通じて自己組織化される高ベータ、低qトカマクプラズマ(beta p>or=1,qI<2)における周辺磁気揺動のトロイダル方向およびポロイダル方向の回転と、安定状態への緩和に対するその回転の役割について調べた。磁気変形は、プラズマがトロイダル対称なプラズマへ緩和する初期緩和過程で回転を始める。安定な緩和状態では、バルーニング様の磁気変形が磁力線にほぼ沿って回転する。バルクプラズマは変形とともに回転する。回転はまた、各緩和過程によって加速される。本実験では、緩和状態にある低qプラズマ(qI<2)は、磁気揺動を抑制するトロイダル方向およびポロイダル方向の両方のプラズマ回転と、臨界値より高いbeta Pを伴う。これにより、高ベータ緩和プラズマに固有の、鋭い周辺密度勾配を伴う広い圧力分布が実現され、閉じ込めが改善される。回転速度はこれらの効果によって高くなり、最終的に高ベータ緩和状態が確立される。ここで生じる一連の現象はL-H遷移に類似している。

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