Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profiles

IF 2.1 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Journal of Plasma Physics Pub Date : 2023-11-21 DOI:10.1017/s0022377823001137
A. Biancalani, A. Bottino, D. Del Sarto, M.V. Falessi, T. Hayward-Schneider, P. Lauber, A. Mishchenko, B. Rettino, J.N. Sama, F. Vannini, L. Villard, X. Wang, F. Zonca, the ASDEX Upgrade team
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Abstract

Nonlinear simulations of Alfvén modes (AMs) driven by energetic particles (EPs) in the presence of turbulence are performed with the gyrokinetic particle-in-cell code ORB5. The AMs carry a heat flux, and consequently they nonlinearly modify the plasma temperature profiles. The isolated effect of this modification on the dynamics of turbulence is studied by means of electrostatic simulations. We find that turbulence is reduced when the profiles relaxed by the AM are used, with respect to the simulation where the unperturbed profiles are used. This is an example of indirect interaction of EPs and turbulence. First, an analytic magnetic equilibrium with circular concentric flux surfaces is considered as a simplified example for this study. Then, an application to an experimentally relevant case of ASDEX Upgrade is discussed.

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通过平衡剖面的修改,研究了气动系统的不稳定性与湍流的非线性相互作用
利用胞内粒子的回旋动力学代码ORB5,对湍流条件下高能粒子驱动的alfv模态(AMs)进行了非线性模拟。AMs携带热流,因此它们非线性地改变了等离子体的温度分布。通过静电模拟研究了这种修正对湍流动力学的孤立影响。我们发现,相对于使用无扰动轮廓的模拟,当使用AM放松的轮廓时,湍流减少了。这是EPs与湍流间接相互作用的一个例子。首先,考虑了一个具有圆形同心磁面的解析磁平衡作为本研究的简化例子。然后,讨论了ASDEX升级在一个实验相关案例中的应用。
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来源期刊
Journal of Plasma Physics
Journal of Plasma Physics 物理-物理:流体与等离子体
CiteScore
3.50
自引率
16.00%
发文量
106
审稿时长
6-12 weeks
期刊介绍: JPP aspires to be the intellectual home of those who think of plasma physics as a fundamental discipline. The journal focuses on publishing research on laboratory plasmas (including magnetically confined and inertial fusion plasmas), space physics and plasma astrophysics that takes advantage of the rapid ongoing progress in instrumentation and computing to advance fundamental understanding of multiscale plasma physics. The Journal welcomes submissions of analytical, numerical, observational and experimental work: both original research and tutorial- or review-style papers, as well as proposals for its Lecture Notes series.
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