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arXiv 1705.06554physics.plasm-ph
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测地声学模式线性无碰撞动力学的交叉码陀螺动力学验证和基准

Cross-code gyrokinetic verification and benchmark on the linear collisionless dynamics of the geodesic acoustic mode

A. Biancalani, A. Bottino, C. Ehrlacher, V. Grandgirard, G. Merlo, I. Novikau, Z. Qiu, E. Sonnendruecker, X. Garbet, T. Goerler, S. Leerink, F. Palermo, D. Zarzoso

摘要:

通过解析理论和回旋动力学数值模拟的比较,研究了托卡马克中测地声学模(GAM)的线性特性。被认为是依赖于安全因子的值,有限轨道宽度的离子的径向模式宽度,磁通量表面成形,和电子/离子质量比。等离子体分布的不均匀性(如密度,温度或安全系数),电磁效应,碰撞和少数物种的存在被忽略。此外,只考虑线性模拟,专注于本地动态。我们使用三种不同的gyrokinetic代码:拉格朗日(细胞中的粒子)代码ORB 5,欧拉代码GENE和半拉格朗日代码GYSELA。本文的主要目的之一是提供一个详细的比较的数值结果和分析理论,在制度,这是可能的。这有助于更好地理解线性GAM动力学在这些不同制度的行为,行为的代码,这是至关重要的,在未来的工作中,更多的物理是目前,和制度的有效性,每个特定的分析色散关系。

英文摘要:

The linear properties of the geodesic acoustic modes (GAM) in tokamaks are investigated by means of the comparison of analytical theory and gyrokinetic numerical simulations. The dependence on the value of the safety factor, finite-orbit-width of the ions in relation to the radial mode width, magnetic-flux-surface shaping, and electron/ion mass ratio are considered. Nonuniformities in the plasma profiles (such as density, temperature, or safety factor), electro-magnetic effects, collisions and presence of minority species are neglected. Also, only linear simulations are considered, focusing on the local dynamics. We use three different gyrokinetic codes: the lagrangian (particle-in-cell) code ORB5, the eulerian code GENE and semi-lagrangian code GYSELA. One of the main aims of this paper is to provide a detailed comparison of the numerical results and analytical theory, in the regimes where this is possible. This helps understanding better the behavior of the linear GAM dynamics in these different regimes, the behavior of the codes, which is crucial in the view of a future work where more physics is present, and the regimes of validity of each specific analytical dispersion relation.

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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