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Diffusion of stochastic magnetic field lines with average poloidal magnetic component

M Negrea2019年Plasma Physics and Controlled FusionIF 2.2出版社

We study the diffusion of stochastic isotropic and anisotropic magnetic field lines in turbulence with average poloidal magnetic field component. In the current work we employ the so-called DeCorrelation Trajectory method in order to compute the running and asymptotic diffusion coefficients of stochastic magnetic field lines with average poloidal magnetic field component. A modification of the diffusion coefficients is caused by the average magnetic field component parameter in the presence of trajectory trapping. We calculate the field line diffusion coefficients Dxx and Dyy for different values of the magnetic Kubo number K, the average magnetic field component parameter Kav and the anisotropy parameter Λ. Furthermore we compare our new findings with those already obtained in papers dealing with the calculus of the diffusion coefficients for a stochastic sheared magnetic field.

日本語訳

我々は、平均ポロイダル磁場成分を有する乱流中の確率的等方性および異方性磁力線の拡散を研究する。本研究では、いわゆるデコリレーション軌道法を用いて、平均ポロイダル磁場成分を有する確率的磁力線の漸近的および有限時間拡散係数を計算する。拡散係数の修正は、軌道捕捉の存在下での平均磁場成分パラメータによって引き起こされる。我々は、異なる磁気久保数K、平均磁場成分パラメータKav、および異方性パラメータΛの値に対して、磁力線拡散係数DxxおよびDyyを計算する。さらに、我々の新しい結果を、確率的せん断磁場の拡散係数の計算を扱った既存の論文で得られた結果と比較する。

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