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arXiv 1801.09495physics.plasm-ph
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多物种仿星器等离子体中纬向流的振荡弛豫

Oscillatory relaxation of zonal flows in a multi-species stellarator plasma

E. Sánchez, I. Calvo, J. L. Velasco, F. Medina, A. Alonso, P. Monreal, R. Kleiber, the TJ-II team

AI总结:

本文通过全域回旋动理学模拟研究TJ-II仿星器中多物种等离子体纬向流的振荡弛豫,证明可用单物种外推公式准确获得频率,并阐明多物种碰撞对阻尼的影响。

摘要:

在TJ-II仿星器中(该现象首次在实验中被探测到),对纬向势扰动的低频振荡弛豫进行了数值研究。该研究在全域回旋动理学模拟的多物种等离子体中开展。所获得的振荡频率与基于单物种模拟并使用简化解析关系的预测进行了比较。结果表明,多物种等离子体的该振荡频率可以通过使用外推公式从单物种计算中准确获得。详细研究了振荡的阻尼以及不同物种间碰撞的影响。结论是,考虑多个动理学离子和电子,并采用对TJ-II等离子体而言符合实际的杂质浓度,能够解释实验中观测到的纬向流弛豫的频率值和阻尼率值。

英文摘要:

The low frequency oscillatory relaxation of zonal potential perturbations is studied numerically in the TJ-II stellarator (where it was experimentally detected for the first time). It is studied in full global gyrokinetic simulations of multi-species plasmas. The oscillation frequency obtained is compared with predictions based on single-species simulations using simplified analytical relations. It is shown that the frequency of this oscillation for a multi-species plasma can be accurately obtained from single-species calculations using extrapolation formulas. The damping of the oscillation and the influence of the different inter-species collisions is studied in detail. It is concluded that taking into account multiple kinetic ions and electrons with impurity concentrations realistic for TJ-II plasmas allows to account for the values of frequency and damping rate in zonal flows relaxations observed experimentally.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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