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arXiv 1912.09409physics.plasm-ph
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turbulence存在下Alfvén不稳定性的回旋动力学研究

Gyrokinetic investigation of Alfvén instabilities in the presence of turbulence

A. Biancalani, A. Bottino, A. Di Siena, F. Jenko, P. Lauber, A. Mishchenko, I. Novikau, L. Villard

摘要:

采用全局电磁回旋动力学粒子模拟程序ORB 5研究了磁约束等离子体中Alfvén模(AM)与离子温度梯度(ITG)湍流之间的自洽相互作用.在这里,一个轴对称的磁平衡与反向剪切和大的纵横比被认为是。通过引入超热离子群,使环模数n=5的AM不稳定。一旦AM在充分发展的湍流的存在下饱和,离子热通量由AM及其主要谐波主导。ITG诱导的运输也被发现在不稳定的AM的存在下增强。

英文摘要:

The global and electromagnetic gyrokinetic particle-in-cell code ORB5 is employed to investigate the self-consistent interactions between Alfvén modes (AM) and ion temperature gradient (ITG) turbulence in a magnetically confined plasma. Here, an axisymmetric magnetic equilibrium with reversed shear and large aspect ratio is considered. An AM with toroidal mode number n=5 is driven unstable by introducing a population of suprathermal ions. Once the AM saturates in the presence of the fully developed turbulence, the ion heat flux is dominated by the AM and its main harmonics. ITG-induced transport is found to also be enhanced in the presence of the unstable AM.

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