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Control of neoclassical tearing mode by synergetic effects of resonant magnetic perturbation and electron cyclotron current drive in reversed magnetic shear tokamak plasmas

Weikang Tang, Zheng-Xiong Wang, Lai Wei, Jialei Wang, Shuangshuang Lu2020年被引用 33Nuclear FusionIF 3出版社

Synergetic effects of resonant magnetic perturbation (RMP) and electron cyclotron current drive (ECCD) on stabilizing neoclassical tearing mode (NTM) in reversed magnetic shear (RMS) tokamak plasmas are numerically investigated based on a set of reduced MHD equations. For the moderate separation, it is found that the explosive burst induced by the fast reconnection of double tearing mode (DTM) in the RMS configuration can be completely suppressed by externally applied RMPs. Zonal flows with strong shear induced by a rotating RMP play an important role in this suppression process. Moreover, turning on ECCD in advance is essential to mitigate the NTM. For the large separation without the explosive burst, two strategies, i.e. a continuous ECCD with static RMP and a modulated ECCD with rotating RMP, are separately investigated. It is shown that when the NTM is decelerated by a relatively slow rotating RMP, the modulated ECCD can have a better stabilizing effect. In addition, the ECCD deposition widths in both radial and helical angle directions, as well as the ECCD on-duty time, are analyzed in detail. The best effectiveness of ECCD is obtained and the relevant physical mechanisms are discussed.

日本語訳

反転磁気シア(RMS)トカマクプラズマにおける新古典テアリングモード(NTM)の安定化に対する共鳴磁気摂動(RMP)と電子サイクロトロン電流駆動(ECCD)の相乗効果を、簡約化MHD方程式系に基づいて数値的に調査した。中程度の分離の場合、RMS配位における二重テアリングモード(DTM)の高速磁気リコネクションによって誘起される爆発的バーストが、外部印加RMPによって完全に抑制できることが見出された。回転RMPによって誘起される強いシアを有する帯状流が、この抑制過程において重要な役割を果たす。さらに、ECCDを事前に投入することがNTMの緩和に不可欠である。爆発的バーストを伴わない大きな分離の場合、静的RMPを伴う連続ECCDと回転RMPを伴う変調ECCDという2つの戦略をそれぞれ調査した。比較的遅い回転RMPによってNTMが減速される場合、変調ECCDの方がより良い安定化効果を得られることが示された。さらに、ECCDの堆積幅(径方向および螺旋角方向の両方)とECCDのデューティ比について詳細に解析した。ECCDの最適な有効性が得られ、関連する物理メカニズムについて議論する。

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Current driveTearing modeMagnetic perturbationResonant magnetic perturbationNeoclassical tearing modeElectron cyclotron current driveMagnetic shearReversed magnetic shear
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