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.
类型: 期刊论文
作者: 魏来,王正汹,李继全,胡朝清,岸本泰明
来源: Chinese Physics B 2019年12期
年度: 2019
分类: 基础科学
专业: 力学
单位: Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics,Dalian University of Technology,Southwestern Institute of Physics,Graduate School of Energy Science, Kyoto University
基金: 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),the Fundamental Research Funds for the Central Universities of China(Grant No.DUT17RC(4)54)
分类号: O361.3
页码: 241-251
总页数: 11
文件大小: 2539K
下载量: 7
本文来源: https://www.lunwen90.cn/article/11b72a5d3f8a115bac3c6874.html