Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode
- Peking Univ., Beijing (China); Inst. of Applied Physics and Computational Mathematics, Beijing (China)
- Peking Univ., Beijing (China)
- Univ. of California, Irvine, CA (United States)
- Chinese Academy of Sciences, Beijing (China)
The beta-induced Alfven-acoustic eigenmode (BAAE) in toroidal plasmas is verified and studied by global gyrokinetic particle simulations. When ion temperature is much lower than electron temperature, the existence of the weakly damped BAAE is verified in the simulations using initial perturbation, antenna excitation, and energetic particle excitation, respectively. When the ion temperature is comparable to the electron temperature, the unstable BAAE can be excited by realistic energetic particle density gradient, even though the stable BAAE (in the absence of energetic particles) is heavily damped by the thermal ions. In the simulations with reversed magnetic shear, BAAE frequency sweeping is observed and poloidal mode structure has a triangle shape with a poloidal direction similar to that observed in tokamak experiments. Here, the triangle shape changes the poloidal direction, and no frequency sweeping is found in the simulations with normal magnetic shear.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 1565472
- Alternate ID(s):
- OSTI ID: 1249758
- Journal Information:
- Physics of Plasmas, Vol. 23, Issue 4; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
On energetic-particle excitations of low-frequency Alfvén eigenmodes in toroidal plasma
|
journal | July 2017 |
Mode structure symmetry breaking of energetic particle driven beta-induced Alfvén eigenmode
|
journal | January 2018 |
Shear Alfvén and acoustic continuum in general axisymmetric toroidal geometry
|
journal | August 2019 |
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