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Physics of penetration of resonant magnetic perturbations used for Type I edge localized modes suppression in tokamaks

M. Bécoulet, G. Huysmans, X. Garbet, E. Nardon, D. Howell, A. Garofalo, M. Schaffer, T. Evans, K. Shaing, A. Cole2009年被引用 84Nuclear FusionIF 3出版社

Non-linear reduced MHD modelling of the toroidally rotating plasma response to resonant magnetic perturbations (RMPs) is presented for DIII-D and ITER-like typical parameter and RMP coils. The non-linear cylindrical reduced MHD code was adapted to take into account toroidal rotation and plasma braking mechanisms such as resonant one (∼j × B) and the neoclassical toroidal viscosity (NTV) calculated for low collisionality regimes ('1/ν' and 'ν'). Counter toroidal rotation by NTV is predicted for ITER with the proposed RMP coils in 1/ν-limit. Resonant braking is localized near resonant surfaces and is weak compared with NTV in the 1/ν regime for typical DIII-D and ITER parameters. Toroidal rotation leads to the effective screening of RMPs that is larger for stronger rotation and lower resistivity, resulting mainly in central islands screening. Non-resonant helical harmonics (q ≠ m/n) in RMP spectrum are not influenced by plasma rotation, and hence penetrate and are important in NTV mechanism.

日本語訳

DIII-DおよびITER類似の典型的なパラメータとRMPコイルに対する、トロイダル回転するプラズマの共鳴磁場摂動(RMP)応答の非線形簡約MHDモデリングを提示する。非線形円筒簡約MHDコードを、トロイダル回転および共鳴(∼j × B)や低衝突度領域('1/ν'および'ν')で計算された新古典トロイダル粘性(NTV)などのプラズマ制動機構を考慮に入れるように適応させた。提案されたRMPコイルを用いたITERでは、1/ν極限においてNTVによる反トロイダル回転が予測される。共鳴制動は共鳴面近傍に局在し、典型的なDIII-DおよびITERパラメータにおける1/ν領域のNTVと比較して弱い。トロイダル回転はRMPの効果的な遮蔽をもたらし、その遮蔽はより強い回転およびより低い抵抗率で大きくなり、主に中心部の島の遮蔽をもたらす。RMPスペクトル中の非共鳴ヘリカル高調波(q ≠ m/n)はプラズマ回転の影響を受けず、したがって侵入してNTV機構において重要である。

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diii-d中精度(概要文一致)iter中精度(概要文一致)

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Edge localized modeMagnetic perturbationResonant magnetic perturbation
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