Nonlinear dynamics of beta-induced Alfvén eigenmode in tokamak

Zhang, H. S.; Lin, Z.; Deng, W.; Holod, I.; Wang, Z. X.; Xiao, Y.; Zhang, W. L.

doi:10.1063/1.4776698

Nonlinear dynamics of beta-induced Alfvén eigenmode in tokamak

Journal Article · Tue Jan 22 00:00:00 EST 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4776698· OSTI ID:1565000

Zhang, H. S. ^[1]; Lin, Z. ^[2]; Deng, W. ^[2]; Holod, I. ^[2]; Wang, Z. X. ^[2]; Xiao, Y. ^[3]; Zhang, W. L. ^[4]

Peking Univ., Beijing (China); Univ. of California, Irvine, CA (United States)
Univ. of California, Irvine, CA (United States)
Zhejiang Univ., Hangzhou (China)
Univ. of Science and Technology of China, Hefei (China)

The beta-induced Alfvén eigenmode (BAE) excited by energetic particles in toroidal plasmas is studied in the global gyrokinetic simulations. It is found that the nonlinear BAE dynamics depends on the deviation from the marginality. In the strongly driven case, the mode exhibits a bursting state with fast and repetitive chirping. The nonlinear saturation is determined by the thermal ion nonlinearity and has no clear dependence on the linear growth rate. In the weakly driven case, the mode reaches a nearly steady state with small frequency chirping. The nonlinear dynamics is dominated by the energetic particle nonlinearity. In both cases, the nonlinear intensity oscillation and frequency chirping are correlated with the evolution of the coherent structures in the energetic particle phase space. Due to the radial variation of the mode amplitude and the radially asymmetric guiding center dynamics, the wave-particle interaction in the toroidal geometry is much more complex than the conventional one-dimensional wave-particle interaction paradigm.

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 Office of Science (SC)

OSTI ID:: 1565000

Alternate ID(s):: OSTI ID: 22113356

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 20; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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