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Plasma equilibrium and stability in a longitudinally inhomogeneous system with non-circular magnetic surfaces

T.F. Volkov, A.V. Dobryakov, B.A. Trubnikov1985年被引用 4Nuclear FusionIF 3出版社

Equilibrium equations representing a generalization of the corresponding Shafranov-Yurchenko equations are derived for a study of plasma equilibrium and stability in an arbitrarily inhomogeneous magnetic configuration and are solved for one specific case. The stability analysis is performed on the basis of the Mercier criterion. It is shown that, in an approximation linear with respect to ellipticity, the deepening of the magnetic well as a result of plasma displacement can, given an appropriate geometry, outweigh the contribution from ballooning modes. Such geometry is exemplified by the magnetic confinement system Drakon. The improvement in stability is already found in the second-order-pressure approximation (∼β2), whereas in the homogeneous case a similar effect of self-stabilization is observed at higher orders.

日本語訳

平衡方程式は、対応するシャフラノフ–ユルチェンコ方程式の一般化を表すものであり、任意の不均一磁場配位におけるプラズマ平衡と安定性の研究のために導出され、特定の一つの場合について解かれる。安定性解析はメルシエ規準に基づいて行われる。楕円度に関して線形な近似において、プラズマ変位の結果として生じる磁気井戸の深化が、適切な幾何学形状が与えられれば、バルーニングモードからの寄与を上回り得ることが示される。そのような幾何学形状は、磁気閉じ込めシステム「ドラコン」によって例示される。この安定性の改善は、二次の圧力近似(∼β²)においてすでに見出されるのに対し、均一な場合には同様の自己安定化効果はより高次の項で観測される。

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Plasma equilibrium
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