Effect of kinetic ions on the toroidal double-tearing modes
Ruibo Zhang(张睿博)1,2, Lei Ye(叶磊)1,†, Yang Chen3, Nong Xiang(项农)1, and Xiaoqing Yang(杨小庆)1
1 Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; 2 University of Science and Technology of China, Hefei 230026, China; 3 Center for Integrated Plasma Studies, University of Colorado at Boulder, Boulder, Colorado 80309, USA
Abstract We investigate the effects of kinetic ions on double-tearing modes (DTMs) using the gyrokinetic particle-in-cell simulation code GEM with a gyrokinetic ion/fluid electron hybrid model. It is found that the ion kinetic effects can decrease the growth rate of the DTMs. This effect is more significant for stronger coupling of DTMs with smaller distance between the rational surfaces. Kinetic ions can also enhance the coupling effect between the two rational surfaces. Energy transfer analyses between particles and wave fields show that the stabilizing effect of kinetic ions comes mainly from the perpendicular magnetic drift of ions in the coupling region and around the outer rational surface.
(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
Fund: This work was supported by the National MCF Energy R&D Program of China (Grant No. 2019YFE03060001), the National Key R&D Program of China (Grant No. 2017YFE0300406), and the National Natural Science Foundation of China (Grant Nos. 11975272 and 11905257). Y. Chen is supported by the SciDAC Center Advanced Tokamak Modeling Environment (AToM) (Grant No. DE-SC0017992). The numerical calculations in this work were performed on the ShenMa High Performance Computing Cluster in Institute of Plasma Physics, Chinese Academy of Sciences, and resources of the National Energy Research Scientific Computing Center (NERSC), which are supported by the Office of Science of the U.S. Department of Energy (Grant No. DEAC02-05CH11231).
Corresponding Authors:
Lei Ye
E-mail: lye@ipp.ac.cn
Cite this article:
Ruibo Zhang(张睿博), Lei Ye(叶磊), Yang Chen, Nong Xiang(项农), and Xiaoqing Yang(杨小庆) Effect of kinetic ions on the toroidal double-tearing modes 2023 Chin. Phys. B 32 025203
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