Radiation-driven m   =  2 island formation and dynamics near density limit in experimental advanced superconducting tokamak ohmic plasma

作者：Liqing Xu, Yanmin Duan, Kaiyun Chen, Hailin Zhao, Zhenping Luo, Zhen Zheng, Yong Liu, Haiqing Liu, Ying-Jie Chen, Yi Yuan, Liqun Hu, Hongfei Du, Tonghui Shi · 发表于：Nuclear Fusion · 年份：2017 · DOI：10.1088/1741-4326/aa7f91 · 被引用次数：18 · 研究领域：Magnetic confinement fusion research、Superconducting Materials and Applications、Ionosphere and magnetosphere dynamics

A radiation-driven m = 2 island was observed in the experimental advanced superconducting tokamak (EAST) ohmic plasma, near the density limit. The mode onset occurs when the the ohmic heating input is less than the radiative cooling loss, which agrees with the mode onset behavior of the thermo-resistive model. The evolution of the equilibrium during the mode process was obtained using the ONETWO transport code, with inputs comprising the experimental electron temperature and density profiles. A large m = 2 island can drive an m = 1 sideband mode, which leads to an internal crash that appears as a large change in temperature that occurs not only in the q = 2 region but also in the core.