中国物理B ›› 2019, Vol. 28 ›› Issue (12): 125203-125203.doi: 10.1088/1674-1056/ab5437

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Basic features of the multiscale interaction between tearing modes and slab ion-temperature-gradient modes

L Wei(魏来), Z X Wang(王正汹), J Q Li(李继全), Z Q Hu(胡朝清), Y Kishimoto(岸本泰明)   

  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 Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
  • 收稿日期:2019-09-24 修回日期:2019-10-30 出版日期:2019-12-05 发布日期:2019-12-05
  • 通讯作者: L Wei, Z X Wang E-mail:laiwei@dlut.edu.cn;zxwang@dlut.edu.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant Nos. 2017YFE0301100 and 2017YFE0300500), the National Natural Science Foundation of China (Grant Nos. 11675038, 11775069, and 11305027), and the Fundamental Research Funds for the Central Universities of China (Grant No. DUT17RC(4)54).

Basic features of the multiscale interaction between tearing modes and slab ion-temperature-gradient modes

L Wei(魏来)1, Z X Wang(王正汹)1, J Q Li(李继全)2, Z Q Hu(胡朝清)1, Y Kishimoto(岸本泰明)3   

  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 Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
  • Received:2019-09-24 Revised:2019-10-30 Online:2019-12-05 Published:2019-12-05
  • Contact: L Wei, Z X Wang E-mail:laiwei@dlut.edu.cn;zxwang@dlut.edu.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant Nos. 2017YFE0301100 and 2017YFE0300500), the National Natural Science Foundation of China (Grant Nos. 11675038, 11775069, and 11305027), and the Fundamental Research Funds for the Central Universities of China (Grant No. DUT17RC(4)54).

摘要: Nonlinear interaction between tearing modes (TM) and slab ion-temperature-gradient (ITG) modes is numerically investigated by using a Landau fluid model. It is observed that the energy spectra with respect to wavenumbers become broader during the transition phase from the ITG-dominated stage to TM-dominated stage. Accompanied with the fast growth of the magnetic island, the frequency of TM/ITG with long/short wavelength fluctuations in the electron/ion diamagnetic direction decreases/increases respectively. The decrease of TM frequency is identified to result from the effect of the profile flattening in the vicinity of the magnetic island, while the increase of the frequencies of ITG fluctuations is due to the eigenmode transition of ITG induced by the large scale zonal flow and zonal current related to TM. Roles of zonal current induced by the ITG fluctuations in the instability of TM are also analyzed. Finally, the electromagnetic transport features in the vicinity of the magnetic island are discussed.

关键词: magnetic reconnection, tearing modes, magnetohydrodynamics, drift waves, nonlinear phenomena

Abstract: Nonlinear interaction between tearing modes (TM) and slab ion-temperature-gradient (ITG) modes is numerically investigated by using a Landau fluid model. It is observed that the energy spectra with respect to wavenumbers become broader during the transition phase from the ITG-dominated stage to TM-dominated stage. Accompanied with the fast growth of the magnetic island, the frequency of TM/ITG with long/short wavelength fluctuations in the electron/ion diamagnetic direction decreases/increases respectively. The decrease of TM frequency is identified to result from the effect of the profile flattening in the vicinity of the magnetic island, while the increase of the frequencies of ITG fluctuations is due to the eigenmode transition of ITG induced by the large scale zonal flow and zonal current related to TM. Roles of zonal current induced by the ITG fluctuations in the instability of TM are also analyzed. Finally, the electromagnetic transport features in the vicinity of the magnetic island are discussed.

Key words: magnetic reconnection, tearing modes, magnetohydrodynamics, drift waves, nonlinear phenomena

中图分类号:  (Magnetic reconnection)

  • 52.35.Vd
52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)) 52.30.Cv (Magnetohydrodynamics (including electron magnetohydrodynamics)) 52.35.Kt (Drift waves)