セパラトリクスの外側にプラズマが存在する逆転磁場平衡配位

概要

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Two dimensional equilibria of field reversed configuration with plasma outside the separatrix is investigated. By numerical calculation, it is found that the separatrix (ψ=0) becomes spindly as βs (beta ratio on the surface ψ=0) increases. Remarkable is that the surface ψ=0 becomes an open surface and no more the separatrix as βs is increased beyond a critical value, and furthermore, that only axially uniform configurations are obtained when βs is greater than a second critical value. Existance of the critical values of βs are explained with use of a long thin plasma model and a condition of axial force balance which takes into account the plasma outside the separatrix. The critical values obtained with this model well agree with the two dimensional numerical results as well as radii of the plasma at the center plane and at the ends of vessel.
社団法人プラズマ・核融合学会の論文