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Magneto-thermal reconnection processes, related mode momentum and formation of high energy particle populations

B. Coppi, B. Basu, A. Fletcher2017年被引用 3Nuclear FusionIF 3出版社

In the context of a two-fluid theory of magnetic reconnection, when the longitudinal electron thermal conductivity is relatively large, the perturbed electron temperature tends to become singular in the presence of a reconnected field component and an electron temperature gradient. A finite transverse thermal diffusivity removes this singularity while a finite 'inductivity' can remove the singularity of the relevant plasma displacement. Then (i) a new 'magneto-thermal' reconnection producing mode, is found with characteristic widths of the reconnection layer remaining significant even when the macroscopic distances involved are very large; (ii) the mode phase velocities can be both in the direction of the electron diamagnetic velocity as well in the opposite (ion) direction. A numerical solution of the complete set of equations has been carried out with a simplified analytical reformulation of the problem. A sequence of processes is analyzed to point out that high-energy particle populations can be produced as a result of reconnection events. These involve mode-particle resonances transferring energy of the reconnecting mode to a superthermal ion population and the excitation of lower hybrid waves that can lead to a significant superthermal electron population. The same modes excited in axisymmetric (e.g. toroidal) confinement configurations can extract angular momentum from the main body of the plasma column and thereby sustain a local 'spontaneous rotation' of it.

日本語訳

磁気リコネクションの二流体理論の文脈において、縦方向の電子熱伝導率が比較的大きい場合、再結合した磁場成分と電子温度勾配の存在下で、摂動電子温度は特異になる傾向がある。有限の横方向熱拡散率はこの特異性を取り除く一方、有限の「インダクティビティ」は関連するプラズマ変位の特異性を取り除くことができる。そのとき、(i) 新しい「磁気熱的」リコネクション生成モードが見いだされ、リコネクション層の特性幅は、関連する巨視的距離が非常に大きい場合でも有意なままである;(ii) モードの位相速度は、電子反磁性速度の方向と、その反対(イオン)方向の両方をとり得る。完全な方程式系の数値解が、問題の簡略化された解析的再定式化を用いて得られた。一連の過程が分析され、リコネクション事象の結果として高エネルギー粒子集団が生成され得ることが指摘される。これらには、リコネクションモードのエネルギーを超熱的イオン集団に移すモード-粒子共鳴と、有意な超熱的電子集団をもたらし得る低混成波の励起が含まれる。軸対称(例えばトロイダル)閉じ込め配位で励起された同じモードは、プラズマ柱の主要部から角運動量を抽出し、それによってプラズマ柱の局所的な「自発回転」を維持することができる。

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