Verification of Energetic-Particle-Induced Geodesic Acoustic Mode in Gyrokinetic Particle Simulations
Yang Chen1,2,3 , Wenlu Zhang2,4,3,1,5* , Jian Bao2,3 , Zhihong Lin6 , Chao Dong2,3 , Jintao Cao2,3 , and Ding Li2,4,3,5
1 School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China2 Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China4 Songshan Lake Materials Laboratory, Dongguan 523808, China5 CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China6 Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
Abstract ：The energetic-particle-induced geodesic acoustic mode (EGAM) is studied using gyrokinetic particle simulations in tokamak plasmas. In our simulations, exponentially growing EGAMs are excited by energetic particles with a slowing-down distribution. The frequencies of EGAMs are always below the frequencies of GAMs, which is due to the non-perturbative contribution of energetic particles (EPs). The mode structures of EGAMs are similar to the corresponding mode structures of GAMs. Our gyrokinetic simulations show that a high EP density can enhance the EGAM growth rate, due to high EP free energy, and that EPs' temperature and the pitch angle of the distribution modify the EGAM frequency/growth rate by means of the resonance condition. Kinetic effects of the thermal electrons barely change the EGAM frequency, and have a weak damping effect on the EGAM. Benchmarks between the gyrokinetic particle simulations and a local EGAM dispersion relation exhibit good agreement in terms of EGAM frequency and growth rate.
收稿日期: 2020-05-27
出版日期: 2020-09-01
:
52.35.Bj
(Magnetohydrodynamic waves (e.g., Alfven waves))
52.40.Mj
(Particle beam interactions in plasmas)
52.30.-q
(Plasma dynamics and flow)
引用本文:
. [J]. 中国物理快报, 2020, 37(9): 95201-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/9/095201
或
https://cpl.iphy.ac.cn/CN/Y2020/V37/I9/95201
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2020, Vol. 37 
