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Role of stochastic anisotropy and shear on magnetic field lines diffusion

M Negrea, I Petrisor, B Weyssow2007年Plasma Physics and Controlled FusionIF 2.2出版社

Anisotropy in the magnetic fluctuation spectrum (stochastic anisotropy) and magnetic shear induce variations of global averaged quantities such as the running and the asymptotic diffusion tensors that can be investigated using a semi-analytical method. The study considers ranges for the anisotropy parameter, magnetic Kubo number and shear parameter leading to contrasting dynamical behaviors. In particular, the trapping of the stochastic magnetic field lines is analyzed. An asymptotic 'poloidal' velocity larger for stronger anisotropy is obtained for the wandering of the magnetic field lines for different values of the parameters.

日本語訳

磁場変動スペクトルにおける異方性(確率的異方性)および磁気シアは、半解析的手法を用いて調査可能なランニング拡散テンソルや漸近拡散テンソルなどの大域的平均量の変動を誘起する。本研究では、異なる力学的挙動をもたらす異方性パラメータ、磁気クーボ数、およびシアパラメータの範囲を考察する。特に、確率的磁力線の捕捉が解析される。パラメータの異なる値に対して、磁力線のウォンダリングに関し、より強い異方性に対してより大きな漸近的「ポロイダル」速度が得られる。

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