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3D effects on RWM physics in RFX-mod

M. Baruzzo, T. Bolzonella, S.C. Guo, Y.Q. Liu, G. Marchiori, R. Paccagnella, A. Soppelsa, F. Villone, Z.R. Wang2011年被引用 16Nuclear FusionIF 3出版社

In this paper insights into the behaviour of resistive wall modes (RWMs) in the RFX-mod reversed field pinch device are given, with a focus on 3D issues in the characterization of the m spectrum of the mode and on the study of multi-harmonic coupling.In the first part of the paper the interaction between multiple unstable RWMs is studied and the presence of a coupling between different poloidal components of the most unstable RWM is demonstrated, taking advantage of the flexibility of the RFX-mod control system.In the second part of the work, the dependence of the growth rates of RWMs on a complete set of plasma parameters is studied in order to create a complete and homogeneous database, which permits a careful validation of stability codes.Finally, the experimental data are compared with the code predictions which take into account the 3D structure of conductors around the plasma. The different effects that modify the simple description, where unstable modes can be identified with single Fourier harmonics, appear to be explained by a mixture of toroidicity-induced and 3D eddy current effects.

日本語訳

本論文では、RFX-mod逆転磁場ピンチ装置における抵抗性壁モード(RWM)の挙動に関する知見を提示し、モードのmスペクトルの3次元的特徴と多高調波結合の研究に焦点を当てる。論文の第一部では、複数の不安定RWM間の相互作用を研究し、RFX-mod制御システムの柔軟性を活用して、最も不安定なRWMの異なるポロイダル成分間の結合の存在を実証する。第二部では、RWMの成長率の完全なプラズマパラメータ群への依存性を研究し、安定性コードの慎重な検証を可能にする完全かつ均質なデータベースを構築する。最後に、実験データを、プラズマ周囲の導体の3次元構造を考慮したコード予測と比較する。不安定モードが単一フーリエ高調波で同定できるという単純な記述を修正する様々な効果は、トロイダル性に起因する効果と3次元渦電流効果の混合によって説明されることが示される。

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