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Internal plasma pressure peaking in low-shear open and closed magnetic confinement systems

M.M. Tsventoukh2011年被引用 6Nuclear FusionIF 3出版社

The plasma convective (flute-interchange) stability for low magnetic shear systems, with a low collisionality and a low beta, is considered in terms of the necessary and sufficient collisionless kinetic criterion. The magnetic confinement systems under consideration are axially symmetric mirrors equipped with outer divertors and inner field reversing rings (cusps, internal rings, high-beta cells) and closed multimirror traps. A simple approach is proposed for plasma stabilization resulting in a substantial steepening of the critical pressure profile. The essence is the combination of the plasma stabilization by a strong and an alternating-sign field-line curvature. Axially symmetric tandem mirror systems composed of a mirror device having an outer divertor and an inner field reversing ring are shown to have an internal radially peaked stable pressure profile. Bumpy tori are also shown to have an internally peaked stable pressure profile.

日本語訳

低磁気シア、低衝突頻度、低ベータの磁気閉じ込め系におけるプラズマの対流性(フルート)交換安定性を、必要十分な無衝突安定性判定基準に基づいて考察する。対象とする磁気閉じ込め系は、外部ダイバータと内部磁場反転リング(カスプ、内部リング、高ベータセル)を備えた軸対称ミラー、および閉じた多ミラー閉じ込め装置である。臨界圧力分布の大幅な急峻化をもたらすプラズマ安定化のための簡便な手法を提案する。その本質は、強力かつ符号反転する磁力線曲率によるプラズマ安定化の組み合わせにある。外部ダイバータと内部磁場反転リングを備えたミラー装置から構成される軸対称タンデムミラー系が、内部に動径方向のピークを持つ安定な圧力分布を有することを示す。バンピートーラスもまた、内部にピークを持つ安定な圧力分布を有することを示す。

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