Nonlinear Generation of Zonal Fields by the Beta-Induced Alfvén Eigenmode in Tokamak

ZHANG Huasen (张桦森); LIN Zhihong (林志宏)

doi:10.1088/1009-0630/15/10/02

Plasma Science and Technology > 2013 > 15(10): 969-973. > DOI: 10.1088/1009-0630/15/10/02

ZHANG Huasen (张桦森), LIN Zhihong (林志宏). Nonlinear Generation of Zonal Fields by the Beta-Induced Alfvén Eigenmode in Tokamak[J]. Plasma Science and Technology, 2013, 15(10): 969-973. DOI: 10.1088/1009-0630/15/10/02

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Nonlinear Generation of Zonal Fields by the Beta-Induced Alfvén Eigenmode in Tokamak

1 Fusion Simulation Center, Peking University, Beijing 100871, China 2 Department of Physics and Astronomy, University of California, Irvine, CA92697, USA

Funds: supported by the China Scholarship Council (No.2009601135), the National Special Research Program of China for ITER (No.2013GB111000), and the U. S. Department of Energy (DOE) SciDAC GSEP center

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Received Date: April 08, 2013

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Abstract

Abstract

The zonal fields effect on the beta-induced Alfvén eigenmode (BAE) destabilized by the energetic particles in toroidal plasmas is studied through the gyrokinetic particle simulations. It is found that the localized zonal fields with a negative value around the mode rational surface are generated by the nonlinear BAE. In the weakly driven case, the zonal fields with a strong geodesic acoustic mode (GAM) component have weak effects on the nonlinear BAE evolution. In the strongly driven case, the zonal fields are dominated by a more significant zero frequency component and have stronger effects on the nonlinear BAE evolution.
- plasma Alfvén waves,
- plasma magnetohydrodynamics,
- plasma simulation

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