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Stabilization of the resistive wall mode in DIII–D by plasma rotation and magnetic feedback

M Okabayashi, J Bialek, M S Chance, M S Chu, E D Fredrickson, A M Garofalo, R Hatcher, T H Jensen, L C Johnson, R J La Haye2002年Plasma Physics and Controlled FusionIF 2.2出版社

Suppression of the resistive wall mode (RWM) has been successfully demonstrated in the DIII–D tokamak by using rotational stabilization in conjunction with a close-fitting vacuum vessel wall. The duration of the high-pressure discharge was extended to hundreds of times the wall skin time. Frequently, the plasma pressure reached the ideal-wall magnetohydrodynamic (MHD) kink limit. The confined pressure is up to twice as high as the no-wall ideal MHD kink limit. Near its marginal stability point, the RWM is found to resonate with residual non-axisymmetric fields (e.g. components of the error field). A magnetic feedback system has been used to identify and compensate for the residual non-axisymmetric fields. This is to the best of our knowledge, the first demonstration of the sustainment of a stable plasma with pressure at levels well above the no-wall pressure limit. This technique is expected to be applicable to other toroidal devices.

日本語訳

抵抗性壁モード(RWM)の抑制は、回転安定化と密着した真空容器壁を組み合わせることにより、DIII–Dトカマクにおいて成功裏に実証された。高圧力放電の持続時間は、壁の表皮時間の数百倍にまで延長された。しばしば、プラズマ圧力は理想壁磁気流体力学(MHD)キンク限界に達した。閉じ込められた圧力は、無壁理想MHDキンク限界の最大2倍に達する。その臨界安定点付近では、RWMは残留する非軸対称磁場(例えば、誤差磁場の成分)と共鳴することが見出された。磁気フィードバックシステムは、残留する非軸対称磁場を同定し補償するために使用された。我々の知る限り、これは無壁圧力限界をはるかに超える圧力レベルでの安定なプラズマの維持の初めての実証である。この手法は、他のトロイダル装置にも適用可能であると期待される。

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DIII-DPlasma rotationResistive wall mode
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