1 Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams(Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China; 2 Southwestern Institute of Physics, Chengdu 610041, China; 3 Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China
Abstract As an obstacle in high-performance discharge in future fusion devices, disruptions may do great damages to the reactors through causing strong electromagnetic forces, heat loads and so on. The drift waves in tokamak are illustrated to play essential roles in the confinement performance as well. Depending on the plasma parameters and mode perpendicular wavelength, the mode phase velocity is either in the direction of electron diamagnetic velocity (namely, typical trapped electron mode) or in the direction of ion diamagnetic velocity (namely, the ubiquitous mode). Among them, the ubiquitous mode is directly investigated using gyro-fluid simulation associating with gyro-fluid equations for drift waves in tokamak plasmas. The ubiquitous mode is charactered by the short wavelength and propagates in ion diamagnetic direction. It is suggested that the density gradient is essential for the occurrence of the ubiquitous mode. However, the ubiquitous mode is also influenced by the temperature gradients and other plasma parameters including the magnetic shear and the fraction of trapped electrons. Furthermore, the ubiquitous mode may play essential roles in the turbulent transport. Meanwhile, the relevant parameters are scanned using a great number of electrostatic gyro-fluid simulations. The stability map is taken into consideration with the micro-instabilities contributing to the turbulent transport. The stability valley of the growth rates occurs with the assumption of the normalized temperature gradient equaling to the normalized density gradient.
Fund: Project partially supported by the National Natural Science Foundation of China (Grant Nos. 12205035 and 11925501) and also partially by the National Key Research and Development Program of China (Grant Nos. 2017YFE0301200 and 2017YFE0301201).
Corresponding Authors:
Feng Wang, Zheng-Xiong Wang
E-mail: fengwang@dlut.edu.cn;zxwang@dlut.edu.cn
Cite this article:
Hui Li(李慧), Ji-Quan Li(李继全), Feng Wang(王丰), Qi-Bin Luan(栾其斌),Hong-En Sun(孙宏恩), and Zheng-Xiong Wang(王正汹) Features of transport induced by ion-driven trapped-electron modes in tokamak plasmas 2023 Chin. Phys. B 32 075206
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