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Comparison between numerical and analytical results on the required rf current for stabilizing neoclassical tearing modes

Xiaojing Wang, Qingquan Yu, Xiaodong Zhang, Yang Zhang, Sizheng Zhu, Xiaoguang Wang, Bin Wu2018年Plasma Physics and Controlled FusionIF 2.2出版社

Numerical studies on the stabilization of neoclassical tearing modes (NTMs) by electron cyclotron current drive (ECCD) have been carried out based on reduced MHD equations, focusing on the amount of the required driven current for mode stabilization and the comparison with analytical results. The dependence of the minimum driven current required for NTM stabilization on some parameters, including the bootstrap current density, radial width of the driven current, radial deviation of the driven current from the resonant surface, and the island width when applying ECCD, are studied. By fitting the numerical results, simple expressions for these dependences are obtained. Analysis based on the modified Rutherford equation (MRE) has also been carried out, and the corresponding results have the same trend as numerical ones, while a quantitative difference between them exists. This difference becomes smaller when the applied radio frequency (rf) current is smaller.

日本語訳

非新古典撕裂模(NTM)の電子サイクロトロン電流駆動(ECCD)による安定化に関する数値的研究を、簡約MHD方程式に基づいて実施し、モード安定化に必要な駆動電流の量と解析結果との比較に焦点を当てた。NTM安定化に必要な最小駆動電流の、ブートストラップ電流密度、駆動電流の径方向幅、駆動電流の共鳴面からの径方向ずれ、およびECCD適用時の磁気島幅などのいくつかのパラメータへの依存性を調べた。数値結果をフィッティングすることにより、これらの依存性に対する簡潔な式を得た。また、修正ラザフォード方程式(MRE)に基づく解析も行い、対応する結果は数値結果と同様の傾向を示すが、定量的な差異が存在することがわかった。この差異は、印加する高周波(rf)電流が小さいほど小さくなることが明らかになった。

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Tearing modeNeoclassical tearing mode
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