Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode

Zhang, H. S.; Liu, Y. Q.; Lin, Z.; Zhang, W. L.

doi:10.1063/1.4947205

Gyrokinetic particle simulation of beta-induced Alfven-acoustic eigenmode

Journal Article · Mon Apr 25 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4947205· OSTI ID:1565472

Zhang, H. S. ^[1]; Liu, Y. Q. ^[2]; ^[3]; Zhang, W. L. ^[4]

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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1565472

Alternate ID(s):: OSTI ID: 22599131
OSTI ID: 1249758

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 23; ISSN PHPAEN; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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On energetic-particle excitations of low-frequency Alfvén eigenmodes in toroidal plasma Chen, Liu; Zonca, Fulvio Physics of Plasmas, Vol. 24, Issue 7 https://doi.org/10.1063/1.4993056	journal	July 2017
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Shear Alfvén and acoustic continuum in general axisymmetric toroidal geometry Falessi, Matteo Valerio; Carlevaro, Nakia; Fusco, Valeria Physics of Plasmas, Vol. 26, Issue 8 https://doi.org/10.1063/1.5098982	journal	August 2019

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