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MHD tilting modes for nearly spherical compact toroids with arbitrary plasma pressure

J.H. Hammer1981年被引用 30Nuclear FusionIF 3出版社

The ideal-MHD analysis of tilting is extended to arbitrary plasma pressure and configuration with the limitation that the separatrix and wall remain nearly spherical. An expansion about the lowest-order eigenmode, a rigid rotation, is used to reduce δW to surface integrals involving only known equilibrium quantities. Previous results are recovered, showing that elliptically prolate structures are unstable for a wall outside the separatrix and elliptically oblate structures are stable with a conducting shell close but outside the separatrix. New results include: non-elliptical prolate shapes can be stable (problimaks); a wall inside the separatrix is stabilizing; stability is insensitive to the magnitude of the plasma pressure but somewhat sensitive to the current profile; at fixed wall-surface area, factors of two in the stability conditions are achieved by changing the separatrix and wall shapes.

日本語訳

理想MHDの傾斜解析は、セパラトリクスと壁がほぼ球状を保つという制限のもとで、任意のプラズマ圧力と配位に拡張される。最低次の固有モード(剛体回転)に関する展開を用いて、δWを既知の平衡量のみを含む表面積分に帰着させる。先行研究の結果が再現され、楕円長球状構造はセパラトリクスの外側に壁がある場合に不安定であり、楕円扁平状構造は導体シェルがセパラトリクスの近くにあるが外側にある場合に安定であることが示される。新たな結果には以下が含まれる:非楕円の長球状形状は安定であり得る(プロブリマック);セパラトリクスの内側の壁は安定化に寄与する;安定性はプラズマ圧力の大きさには鈍感であるが、電流分布にはやや敏感である;固定された壁表面積において、セパラトリクスと壁の形状を変えることで安定性条件の2倍の変化が達成される。

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