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Equilibrium of a small toroidal plasma column with an arbitrary current distribution along the cross section

V.D. Shafranov1963年被引用 28Nuclear FusionIF 3出版社

Transverse (meridional) cross sections of magnetic surfaces in a toroidal plasma column are circles with displaced centers in the first-approximation expansion in ratio of the column radius ϱ to the torus radius R. In the cross section of every magnetic surface a polar coordinate system of its own can be introduced (with the origin on the center of this cross section), in which the transverse magnetic field on a given magnetic surface has an azimuthal component only that changes according to the law Bω(ϱ, ω) = Bω0(ϱ) [1 + (ϱ/R)Λ(ϱ) cos ω]. The "asymmetry coefficient" Λ(ϱ) of the azimuthal field that is introduced thus for every toroidal magnetic surface is an important characteristic of the toroidal equilibrium configuration. It is shown in this paper that the distance Δ(ϱ) between the centers of the cross sections of two magnetic surfaces, is expressed by a simple formula in Λ(ϱ): Here a1 and ϱ are the radii of the chosen cross sections. In their turn the toroidal corrections to plasma pressure and magnetic field are easily expressed in terms of Δ(ϱ). In a fixed coordinate system ω, ϱ, the origin of which coincides with the center of the cross section of radius a1 of some "initial" magnetic surface, the correction to the transverse magnetic field is expressed by the formulas Bϱ(1) (ϱ, ω) = [Δ(ϱ)/R] Bω0 (ϱ) sin ω, Bω(1) (ϱ, ω) = [Bω(0)(ϱ) ϱΛ (ϱ)/R + Δ(ϱ) d Bω0(ϱ)/dϱ] cos ω, and to the longitudinal field by Bφ(1) (ϱ, ω) = [—Bφ0 (ϱ)ϱ/R + Δ(ϱ) d Bφ0(ϱ)/d φ] cos ω.The correction to the pressure is p(1)(ϱ, ω) = Δ(ϱ) cos ω d p0(ϱ)/dϱ. The asymmetry coefficient Λ(ϱ) is determined by a single integration over the values of zero order. In particular, for a continuous plasma column We have also obtained the expression Λ(ϱ) for a tubular (levitron-type) plasma column. Some examples of the calculation of toroidal corrections are given.

日本語訳

トロイダルプラズマ柱内の磁気面の横断面(子午面)は、柱半径ϱとトーラス半径Rの比に関する一次近似展開において、中心がずれた円となる。各磁気面の断面において、その断面の中心を原点とする独自の極座標系を導入することができる。この座標系では、与えられた磁気面上の横磁場は方位角成分のみを持ち、それは Bω(ϱ, ω) = Bω0(ϱ) [1 + (ϱ/R)Λ(ϱ) cos ω] という法則に従って変化する。このようにして各トロイダル磁気面に対して導入される方位角磁場の「非対称係数」Λ(ϱ) は、トロイダル平衡配位の重要な特性である。本論文では、2つの磁気面の断面の中心間の距離 Δ(ϱ) が、Λ(ϱ) の簡単な式で表されることを示す:ここで、a1 と ϱ は選ばれた断面の半径である。次に、プラズマ圧力と磁場へのトロイダル補正は、Δ(ϱ) を用いて容易に表される。原点が何らかの「初期」磁気面の半径 a1 の断面の中心と一致する固定座標系 ω, ϱ において、横磁場への補正は、式 Bϱ(1) (ϱ, ω) = [Δ(ϱ)/R] Bω0 (ϱ) sin ω, Bω(1) (ϱ, ω) = [Bω(0)(ϱ) ϱΛ (ϱ)/R + Δ(ϱ) d Bω0(ϱ)/dϱ] cos ω で表され、縦磁場への補正は Bφ(1) (ϱ, ω) = [—Bφ0 (ϱ)ϱ/R + Δ(ϱ) d Bφ0(ϱ)/d φ] cos ω で表される。圧力への補正は p(1)(ϱ, ω) = Δ(ϱ) cos ω d p0(ϱ)/dϱ である。非対称係数 Λ(ϱ) は、零次の値に対する一回の積分によって決定される。特に、連続プラズマ柱に対しては、我々はまた、管状(レビトロン型)プラズマ柱に対する Λ(ϱ) の式を得た。トロイダル補正の計算のいくつかの例が示される。

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