Gyrokinetic particle simulations of reversed shear Alfvén eigenmode excited by antenna and fast ions

Deng, Wenjun; Lin, Zhihong; Holod, Ihor; Wang, Xin; Xiao, Yong; Zhang, Wenlu

doi:10.1063/1.3496057

Title: Gyrokinetic particle simulations of reversed shear Alfvén eigenmode excited by antenna and fast ions

Journal Article · Tue Nov 09 00:00:00 EST 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3496057· OSTI ID:1564759

Deng, Wenjun ^[1]; Lin, Zhihong ^[2]; Holod, Ihor ^[1]; Wang, Xin ^[3]; Xiao, Yong ^[1]; Zhang, Wenlu ^[4]

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

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.

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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)

OSTI ID:: 1564759

Journal Information:: Physics of Plasmas, Vol. 17, Issue 11; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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