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Response of MHD stability to resonant magnetic perturbation in the Large Helical Device

S. Sakakibara, Y. Narushima, Y. Takemura, M. Okamoto, K.Y. Watanabe, Y. Suzuki, S. Ohdachi, K. Ida, M. Yoshinuma, K. Tanaka2013年被引用 21Nuclear FusionIF 3出版社

Penetration of m/n = 1/1 resonant magnetic perturbation (RMP) in different magnetic configurations was investigated in the Large Helical Device (LHD). In the experiments with constant plasma parameters and heating condition, it was found that the mode penetration threshold increased linearly with increase in the magnetic shear. Also the threshold of penetration was increased by mitigating the magnetic hill. The amplitude of the perturbation field after the penetration was larger than that given by the RMP field. When the magnetic shear was further reduced by the plasma current and the plasma entered the ideal unstable regime, m/n = 1/1 minor collapse occurred after the mode rotation was decelerated and stopped. The occurrence of the collapse was independent of the existence of the error field.

日本語訳

m/n = 1/1共鳴磁気摂動(RMP)の浸透を、大型ヘリカル装置(LHD)において異なる磁気配位で調査した。プラズマパラメータと加熱条件を一定にした実験において、モード浸透閾値は磁気シアの増加に伴って線形に上昇することが見出された。また、磁気ヒルを緩和することにより浸透閾値は上昇した。浸透後の摂動磁場の振幅は、RMP磁場によって与えられる値よりも大きかった。磁気シアをプラズマ電流によってさらに低減し、プラズマが理想不安定領域に入ると、モード回転が減速・停止した後にm/n = 1/1マイナーコラプスが発生した。このコラプスの発生は誤差磁場の有無に依存しなかった。

装置

lhd高精度(タイトル一致)

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MagnetohydrodynamicsMagnetic perturbationResonant magnetic perturbationHelical deviceMHD stability
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