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Elimination of MHD current sheets by modifications to the plasma wall in a fixed boundary model

E Kim, G B McFadden, A J Cerfon2020年Plasma Physics and Controlled FusionIF 2.2出版社

Models of magnetohydrodynamic (MHD) equilibia that for computational convenience assume the existence of a system of nested magnetic flux surfaces tend to exhibit singular current sheets. These sheets are located on resonant flux surfaces that are associated with rational values of the rotational transform. We study the possibility of eliminating these singularities by suitable modifications of the plasma boundary, which we prescribe in a fixed boundary setting. We find that relatively straightforward iterative procedures can be used to eliminate weak current sheets that are generated at resonant flux surfaces by the nonlinear interactions of resonating wall harmonics. These types of procedures may prove useful in the design of fusion devices with configurations that enjoy improved stability and transport properties.

日本語訳

計算の便宜上、入れ子状の磁気面の存在を仮定する磁気流体力学(MHD)平衡モデルは、特異な電流シートを生じる傾向がある。これらのシートは、回転変換の有理数値に関連する共鳴磁気面上に位置する。我々は、固定境界条件下で規定されるプラズマ境界の適切な修正により、これらの特異性を除去する可能性を研究する。比較的単純な反復手順を用いて、共鳴壁の非線形相互作用によって共鳴磁気面上に生成される弱い電流シートを除去できることが分かった。この種の手順は、改善された安定性と輸送特性を備えた配位を有する核融合装置の設計に有用となる可能性がある。

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