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

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

doi:10.1063/1.3496057

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

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3496057· OSTI ID:21531980

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

Department of Physics and Astronomy, University of California, Irvine, California 92697 (United States)

Global gyrokinetic particle simulations of reversed shear Alfven 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 Alfven continuum by the geodesic compressibility. 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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OSTI ID:: 21531980

Journal Information:: Physics of Plasmas, Vol. 17, Issue 11; Other Information: DOI: 10.1063/1.3496057; (c) 2010 American Institute of Physics; ISSN 1070-664X

Country of Publication:: United States

Language:: English

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