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arXiv 2203.01162physics.plasm-ph
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具有各向同性减速快粒子分布的ASDEX升级中Alfvén模活动的回旋动力学模拟

Gyrokinetic modelling of the Alfvén mode activity in ASDEX Upgrade with an isotropic slowing-down fast-particle distribution

Francesco Vannini, Alessandro Biancalani, Alberto Bottino, Thomas Hayward-Schneider, Philipp Lauber, Alexey Mishchenko, Emanuele Poli, Brando Rettino, Gregorio … 展开作者

Francesco Vannini, Alessandro Biancalani, Alberto Bottino, Thomas Hayward-Schneider, Philipp Lauber, Alexey Mishchenko, Emanuele Poli, Brando Rettino, Gregorio Vlad, Xin wang, ASDEX Upgrade team

摘要:

在本文中,阿尔文模式的演变研究在一个现实的ASDEX升级平衡通过分析与全球,电磁,gyrokinetic粒子在细胞代码ORB 5的模拟结果。高能粒子的建模都通过新实施的各向同性减速和麦克斯韦分布函数。数值结果的比较表明,建模的高能粒子与等效麦克斯韦,而不是与减速,不影响驱动阿尔文模式的频率,而其增长率似乎被低估了一个数量的差异高达近30%。此外,各向同性慢化的选择允许一个更好的描述的非线性修改的主要阿尔文模式的频率,而一个等效的麦克斯韦低估它。

英文摘要:

In the present paper, the evolution of the Alfvén modes is studied in a realistic ASDEX Upgrade equilibrium by analysing the results of simulations with the global, electromagnetic, gyrokinetic particle-in-cell code ORB5. The energetic particles are modelled both via the newly implemented isotropic slowing-down and with Maxwellian distribution functions. The comparison of the numerical results shows that modelling the energetic particles with the equivalent Maxwellian rather than with the slowing-down, does not affect the frequency of the driven Alfvén mode, while its growth rate appears to be underestimated with a quantitative difference as large as almost 30 %. Additionally the choice of the isotropic slowing-down allows a better description of the nonlinear modification of the dominant Alfvén mode frequency, while an equivalent Maxwellian underestimates it. A good comparison with the experimental spectrogram is found.

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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