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Physics issues of compact drift optimized stellarators

D.A. Spong, S.P. Hirshman, L.A. Berry, J.F. Lyon, R.H. Fowler, D.J. Strickler, M.J. Cole, B.N. Nelson, D.E. Williamson, A.S. Ware2001年被引用 87Nuclear FusionIF 3出版社

Physics issues are discussed for compact stellarator configurations which achieve good confinement by the fact that the magnetic field modulus |B| in magnetic co-ordinates is dominated by poloidally symmetric components. Two distinct configuration types are considered: (1) those which achieve their drift optimization and rotational transform at low β and low bootstrap current by appropriate plasma shaping; and (2) those which have a greater reliance on plasma β and bootstrap currents for supplying the transform and obtaining quasi-poloidal symmetry. Stability analysis of the latter group of devices against ballooning, kink and vertical displacement modes has indicated that stable β values on the order of 15% are possible. The first class of devices is being considered for a low β near term experiment that could explore some of the confinement features of the high β configurations.

日本語訳

コンパクトなステラレーター配位について、磁気座標における磁場強度 |B| がポロイダル対称成分によって支配されることで良好な閉じ込めを達成する物理的課題を議論する。2つの異なる配位タイプを考察する:(1) 適切なプラズマ形状形成により、低いβ値および低いブートストラップ電流でドリフト最適化と回転変換を実現するもの、および (2) プラズマβとブートストラップ電流に大きく依存して、準ポロイダル対称性を得るもの。後者のグループに対するバルーニング、キンク、および垂直変位モードに対する安定性解析は、β値が約15%のオーダーで安定な配位が可能であることを示している。前者のクラスは、高β配位の閉じ込め特性の一部を探求できる低βの近未来実験として検討されている。

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