中国物理B ›› 2023, Vol. 32 ›› Issue (7): 75206-075206.doi: 10.1088/1674-1056/acae7e

所属专题： SPECIAL TOPIC — Plasma disruption

• • 上一篇    下一篇

Features of transport induced by ion-driven trapped-electron modes in tokamak plasmas

Hui Li(李慧)1, Ji-Quan Li(李继全)2, Feng Wang(王丰)1,†, Qi-Bin Luan(栾其斌)3, Hong-En Sun(孙宏恩)3, and Zheng-Xiong Wang(王正汹)1,‡   

  1. 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
  • 收稿日期:2022-09-23 修回日期:2022-12-14 接受日期:2022-12-27 出版日期:2023-06-15 发布日期:2023-06-29
  • 通讯作者: Feng Wang, Zheng-Xiong Wang E-mail:fengwang@dlut.edu.cn;zxwang@dlut.edu.cn
  • 基金资助:
    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).

Features of transport induced by ion-driven trapped-electron modes in tokamak plasmas

Hui Li(李慧)1, Ji-Quan Li(李继全)2, Feng Wang(王丰)1,†, Qi-Bin Luan(栾其斌)3, Hong-En Sun(孙宏恩)3, and Zheng-Xiong Wang(王正汹)1,‡   

  1. 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
  • Received:2022-09-23 Revised:2022-12-14 Accepted:2022-12-27 Online:2023-06-15 Published:2023-06-29
  • Contact: Feng Wang, Zheng-Xiong Wang E-mail:fengwang@dlut.edu.cn;zxwang@dlut.edu.cn
  • Supported by:
    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).

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摘要： 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.

关键词: drift waves, nonlinear phenomena, plasma simulation

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.

Key words: drift waves, nonlinear phenomena, plasma simulation

中图分类号:  (Drift waves)

  • 52.35.Kt
52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)) 52.65.-y (Plasma simulation)