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arXiv 1502.06390physics.plasm-ph
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非轴对称等离子体中磁面切向漂移对新经典输运的影响

Effects of magnetic drift tangential to magnetic surfaces on neoclassical transport in non-axisymmetric plasmas

Seikichi Matsuoka, Shinsuke Satake, Ryutaro Kanno, Hideo Sugama

摘要:

在用径向局部模拟方法计算新经典输运时,为了保持相空间体积守恒,通常忽略与通量面相切的磁漂移。本文研究了切向磁场漂移对局域新经典输运的影响。为了在新经典输运的局部处理中保留切向磁漂移的影响,发展了一种新的漂移动力学模拟的局部公式。将切向磁漂移引起的相空间体积的可压缩性作为漂移动力学方程的源项,用非哈密顿系统的双权$δf$ Monte Carlo方法[G.~ Hu和J.~ A.~等离子体物理$\rm \textbf{1}$,863(1994)]。结果表明,漂移对托卡马克中新经典输运的影响是可以忽略的。然而,在非轴对称系统中,切向磁漂移实质上改变了新经典输运对径向电场$E_{\rm r}$的依赖性。通过考虑切向磁漂移,消除了传统局域新经典输运模拟中观测到的$E_{\rm r} = 0$周围新经典径向通量的峰值行为。

英文摘要:

In evaluating neoclassical transport by radially-local simulations, the magnetic drift tangential to a flux surface is usually ignored in order to keep the phase-space volume conservation. In this paper, effect of the tangential magnetic drift on the local neoclassical transport are investigated. To retain the effect of the tangential magnetic drift in the local treatment of neoclassical transport, a new local formulation for the drift kinetic simulation is developed. The compressibility of the phase-space volume caused by the tangential magnetic drift is regarded as a source term for the drift kinetic equation, which is solved by using a two-weight $δf$ Monte Carlo method for non-Hamiltonian system [G.~Hu and J.~A.~Krommes, Phys. Plasmas $\rm \textbf{1}$, 863 (1994)]. It is demonstrated that the effect of the drift is negligible for the neoclassical transport in tokamaks. In non-axisymmetric systems, however, the tangential magnetic drift substantially changes the dependence of the neoclassical transport on the radial electric field $E_{\rm r}$. The peaked behavior of the neoclassical radial fluxes around $E_{\rm r} = 0$ observed in conventional local neoclassical transport simulations is removed by taking the tangential magnetic drift into account.

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