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Analytic study of MHD-equilibria of plasmas with non-circular cross-sections

G. Becker1974年被引用 17Nuclear FusionIF 3出版社

MHD-equilibria of plasmas with various half-axis ratios a/b are studied by conformal mapping in a sharpboundary model with surface currents (upper limit for compression ratio κb) and a conducting wall. Plasma surface and wall are co-ordinate surfaces. First, an exact equilibrium solution for a semi-infinite plasma slab between parallel walls is derived (a/b → ∞). It is found that κb is only 2, and that the plasma end is almost semi-circular in shape. Then a class of mapping functions is determined for various a/b that yields sufficiently accurate equilibria and flux lines in the vacuum field region (computing time of only a few seconds). The asymptotic value (a/b → ∞) of the κb-versus-a/b curve is the semi-infinite-slab result.

日本語訳

種々の半軸比a/bを持つプラズマのMHD平衡を、表面電流を伴うシャープバウンダリーモデル(圧縮比κbの上限)と導体壁を用いて、等角写像により研究する。プラズマ表面と壁は座標面を成す。まず、平行平板間の半無限プラズマに対する厳密な平衡解を導出する(a/b → ∞)。この場合、κbはわずか2であり、プラズマ端部はほぼ半円形状であることが見出される。次に、種々のa/bに対して、真空磁場領域における十分に正確な平衡と磁力線を僅か数秒の計算時間で与える写像関数のクラスを決定する。κb対a/b曲線の漸近値(a/b → ∞)は半無限平板の結果と一致する。

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Magnetohydrodynamics
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