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Title: 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:
 [1];  [2]; ORCiD logo [3];  [4]
  1. Peking Univ., Beijing (China); Inst. of Applied Physics and Computational Mathematics, Beijing (China)
  2. Peking Univ., Beijing (China)
  3. Univ. of California, Irvine, CA (United States)
  4. 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:
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. doi: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. doi: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 = {2016},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 4 works
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