Hybrid simulations of Alfvén modes driven by energetic particles
Hybrid simulations of Alfvén modes driven by energetic particles
复制标题
高能粒子驱动的阿尔文模式的混合模拟
DOI：
10.1063/1.4971806
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发表时间：
2016-12
影响因子：
2.2
通讯作者：
S. Wang
中科院分区：
文献类型：
--
作者：
J. Zhu;Z. W. Ma;S. Wang
采用动力学-磁流体动力学混合程序（CLT-K）研究了高能粒子（EP）驱动下Alfvén模的非线性动力学行为.首先激发一个n = 2的环形诱导的离散剪切Alfvén本征模（TAE）型高能粒子模（Ep），它具有两个主要的极向谐波（m = 2和3），其频率在早期阶段保持不变。随后，具有单个主导极向模式（m = 3）的n = 2频率的新分支从原始TAE型谐振子分裂。新的单阶模（m = 3）随着频率的下降而缓慢地径向向外移动，并且模振幅保持在较高的水平。原始的啁啾保持在其原始位置，没有频率啁啾，但其幅度随时间衰减。最后，m = 3的频率变为主导，频率福尔斯落入阿尔文连续谱的β诱导能隙。δf在相空间中的重新分布与模式频率的向下啁啾一致，谐振区的漂移方向主要是由于有偏的自由能分布。从TAE型跃迁到单跃迁的主要原因是p = 0俘获粒子共振在相空间中的扩展。
A hybrid kinetic-magnetohydrodynamic code (CLT-K) is developed to study nonlinear dynamics of Alfvén modes driven by energetic particles (EP). A n = 2 toroidicity-induced discrete shear Alfvén eigenmode (TAE)-type energetic particle mode (EPM) with two dominant poloidal harmonics (m = 2 and 3) is first excited and its frequency remains unchanged in the early phase. Later, a new branch of the n = 2 frequency with a single dominant poloidal mode (m = 3) splits from the original TAE-type EPM. The new single m EPM (m = 3) slowly moves radially outward with the downward chirping of the frequency and the mode amplitude remains at a higher level. The original EPM remains at its original position without the frequency chirping, but its amplitude decays with time. Finally, the m = 3 EPM becomes dominant and the frequency falls into the β-induced gap of the Alfvén continuum. The redistribution of the δf in the phase space is consistent with the mode frequency downward chirping and the drifting direction of the resonance region is mainly due to the biased free energy profile. The transition from a TAE-type EPM to a single m EPM is mainly caused by extension of the p = 0 trapped particle resonance in the phase space.
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影响因子：
2.2
作者：
S. Briguglio;G. Vlad;F. Zonca;C. Kar
通讯作者：
S. Briguglio;G. Vlad;F. Zonca;C. Kar
影响因子：
2.2
作者：
S. Briguglio;F. Zonca;G. Vlad
通讯作者：
S. Briguglio;F. Zonca;G. Vlad
影响因子：
4.1
作者：
C. Cheng;M. Chance
通讯作者：
C. Cheng;M. Chance
影响因子：
--
作者：
BERNSTEIN, IB;GREENE, JM;KRUSKAL, MD
通讯作者：
KRUSKAL, MD
DOI：
10.2172/820209
发表时间：
2003-11
期刊：
--
影响因子：
--
作者：
E. Belova;R. Davidson;H. Ji;M. Yamada
通讯作者：
E. Belova;R. Davidson;H. Ji;M. Yamada