Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode
Abstract
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.
- Authors:
-
[3];
- 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)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1565472
- Alternate Identifier(s):
- OSTI ID: 1249758
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 4; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics
Citation Formats
Zhang, H. S., Liu, Y. Q., Lin, Z., and Zhang, W. L. Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode. United States: N. p., 2016.
Web. doi:10.1063/1.4947205.
Zhang, H. S., Liu, Y. Q., Lin, Z., & Zhang, W. L. Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode. United States. https://doi.org/10.1063/1.4947205
Zhang, H. S., Liu, Y. Q., Lin, Z., and Zhang, W. L. Mon .
"Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode". United States. https://doi.org/10.1063/1.4947205. https://www.osti.gov/servlets/purl/1565472.
@article{osti_1565472,
title = {Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode},
author = {Zhang, H. S. and Liu, Y. Q. and Lin, Z. and Zhang, W. L.},
abstractNote = {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.},
doi = {10.1063/1.4947205},
journal = {Physics of Plasmas},
number = 4,
volume = 23,
place = {United States},
year = {Mon Apr 25 00:00:00 EDT 2016},
month = {Mon Apr 25 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
On energetic-particle excitations of low-frequency Alfvén eigenmodes in toroidal plasma
journal, July 2017
- Chen, Liu; Zonca, Fulvio
- Physics of Plasmas, Vol. 24, Issue 7
Mode structure symmetry breaking of energetic particle driven beta-induced Alfvén eigenmode
journal, January 2018
- Lu, Z. X.; Wang, X.; Lauber, Ph.
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Shear Alfvén and acoustic continuum in general axisymmetric toroidal geometry
journal, August 2019
- Falessi, Matteo Valerio; Carlevaro, Nakia; Fusco, Valeria
- Physics of Plasmas, Vol. 26, Issue 8