The influence of the self-consistent mode structure on the Coriolis pinch effect
The influence of the self-consistent mode structure on the Coriolis pinch effect
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DOI：
10.1063/1.3124133
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发表时间：
2009-06
影响因子：
2.2
通讯作者：
A. Peeters;C. Angioni;Y. Camenen;F. Casson;W. Hornsby;A. Snodin;D. Strintzi
中科院分区：
文献类型：
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作者：
A. Peeters;C. Angioni;Y. Camenen;F. Casson;W. Hornsby;A. Snodin;D. Strintzi
本文讨论了模式结构对科里奥利箍缩效应的影响[A. G.彼得斯角Angioni和D. Strintzi，Phys. Rev. Lett. 98，265003（2007）]。结果表明，科里奥利漂移效应可以通过一个有限的平行波矢量进行补偿，从而降低动量箍缩速度。在全环面几何的陀螺动力学模拟表明，平行动力学有效地消除了科里奥利箍缩的绝热电子的情况下，而由于平行动力学的补偿是不完整的动力学电子的情况下，在有限的箍缩速度。在动力学电子的情况下的有限通量被解释为与电子捕获，这防止了相对于低场侧位置的静电势中的强不对称。这里开发的物理图片导致两个意想不到的效果的发现和解释：第一，收缩速度尺度与被困粒子分数（根的反纵横比），第二，没有强烈的碰撞依赖。后者与被困电子的作用有关，被困电子在本征模中保持一定的对称性，但在扰动的平行速度中不起作用。
This paper discusses the effect of the mode structure on the Coriolis pinch effect [A. G. Peeters, C. Angioni, and D. Strintzi, Phys. Rev. Lett. 98, 265003 (2007)]. It is shown that the Coriolis drift effect can be compensated for by a finite parallel wave vector, resulting in a reduced momentum pinch velocity. Gyrokinetic simulations in full toroidal geometry reveal that parallel dynamics effectively removes the Coriolis pinch for the case of adiabatic electrons, while the compensation due to the parallel dynamics is incomplete for the case of kinetic electrons, resulting in a finite pinch velocity. The finite flux in the case of kinetic electrons is interpreted to be related to the electron trapping, which prevents a strong asymmetry in the electrostatic potential with respect to the low field side position. The physics picture developed here leads to the discovery and explanation of two unexpected effects: First the pinch velocity scales with the trapped particle fraction (root of the inverse aspect ratio), and second there is no strong collisionality dependence. The latter is related to the role of the trapped electrons, which retain some symmetry in the eigenmode, but play no role in the perturbed parallel velocity.