Gyrokinetic particle simulations of reversed shear Alfvén eigenmode excited by antenna and fast ions
Abstract
Global gyrokinetic particle simulations of reversed shear Alfvén eigenmode (RSAE) have been successfully performed and verified. We have excited the RSAE by initial perturbation, by external antenna, and by energetic ions. The RSAE excitation by antenna provides verifications of the mode structure, the frequency, and the damping rate. When the kinetic effects of the background plasma are artificially suppressed, the mode amplitude shows a near-linear growth. With kinetic thermal ions, the mode amplitude eventually saturates due to the thermal ion damping. The damping rates measured from the antenna excitation and from the initial perturbation simulation agree very well. The RSAE excited by fast ions shows an exponential growth. The finite Larmor radius effects of the fast ions are found to significantly reduce the growth rate. With kinetic thermal ions and electron pressure, the mode frequency increases due to the elevation of the Alfvén continuum by the geodesic compressibility. Here, the nonperturbative contributions from the fast ions and kinetic thermal ions modify the mode structure relative to the ideal magnetohydrodynamic (MHD) theory. The gyrokinetic simulations have been benchmarked with extended hybrid MHD-gyrokinetic simulations.
- Authors:
-
- Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
- Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Peking Univ., Beijing (China). Fusion Simulation Center
- Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Zhejiang Univ., Zhejiang (China). Inst. of Fusion Theory and Simulation
- Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Univ. of Science and Technology of China, Anhui (China). CAS Key Lab of Basic Plasma Physics
- 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:
- 1564759
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 11; 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
Deng, Wenjun, Lin, Zhihong, Holod, Ihor, Wang, Xin, Xiao, Yong, and Zhang, Wenlu. Gyrokinetic particle simulations of reversed shear Alfvén eigenmode excited by antenna and fast ions. United States: N. p., 2010.
Web. doi:10.1063/1.3496057.
Deng, Wenjun, Lin, Zhihong, Holod, Ihor, Wang, Xin, Xiao, Yong, & Zhang, Wenlu. Gyrokinetic particle simulations of reversed shear Alfvén eigenmode excited by antenna and fast ions. United States. https://doi.org/10.1063/1.3496057
Deng, Wenjun, Lin, Zhihong, Holod, Ihor, Wang, Xin, Xiao, Yong, and Zhang, Wenlu. Tue .
"Gyrokinetic particle simulations of reversed shear Alfvén eigenmode excited by antenna and fast ions". United States. https://doi.org/10.1063/1.3496057. https://www.osti.gov/servlets/purl/1564759.
@article{osti_1564759,
title = {Gyrokinetic particle simulations of reversed shear Alfvén eigenmode excited by antenna and fast ions},
author = {Deng, Wenjun and Lin, Zhihong and Holod, Ihor and Wang, Xin and Xiao, Yong and Zhang, Wenlu},
abstractNote = {Global gyrokinetic particle simulations of reversed shear Alfvén eigenmode (RSAE) have been successfully performed and verified. We have excited the RSAE by initial perturbation, by external antenna, and by energetic ions. The RSAE excitation by antenna provides verifications of the mode structure, the frequency, and the damping rate. When the kinetic effects of the background plasma are artificially suppressed, the mode amplitude shows a near-linear growth. With kinetic thermal ions, the mode amplitude eventually saturates due to the thermal ion damping. The damping rates measured from the antenna excitation and from the initial perturbation simulation agree very well. The RSAE excited by fast ions shows an exponential growth. The finite Larmor radius effects of the fast ions are found to significantly reduce the growth rate. With kinetic thermal ions and electron pressure, the mode frequency increases due to the elevation of the Alfvén continuum by the geodesic compressibility. Here, the nonperturbative contributions from the fast ions and kinetic thermal ions modify the mode structure relative to the ideal magnetohydrodynamic (MHD) theory. The gyrokinetic simulations have been benchmarked with extended hybrid MHD-gyrokinetic simulations.},
doi = {10.1063/1.3496057},
journal = {Physics of Plasmas},
number = 11,
volume = 17,
place = {United States},
year = {Tue Nov 09 00:00:00 EST 2010},
month = {Tue Nov 09 00:00:00 EST 2010}
}
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