Control of neoclassical tearing mode by synergetic effects of resonant magnetic perturbation and electron cyclotron current drive in reversed magnetic shear tokamak plasmas

Nuclear Fushion

article

Weikang Tang¹  Zheng-Xiong Wang¹  Lai Wei¹  Jialei Wang¹  Shuangshuang Lu¹ 

[1] Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams ,(Ministry of Education), School of Physics, Dalian University of Technology

关键词: neo-classical tearing mode;    reversed magnetic shear;    resonant magneticperturbation;    electron cyclotron current drive;   

DOI  :  10.1088/1741-4326/ab61d5

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

Synergetic effects of resonant magnetic perturbation (RMP) and electron cyclotron current drive (ECCD) on stabilizing neoclassical tearing mode (NTM) in reversed magnetic shear (RMS) tokamak plasmas are numerically investigated based on a set of reduced MHD equations. For the moderate separation, it is found that the explosive burst induced by the fast reconnection of double tearing mode (DTM) in the RMS configuration can be completely suppressed by externally applied RMPs. Zonal flows with strong shear induced by a rotating RMP play an important role in this suppression process. Moreover, turning on ECCD in advance is essential to mitigate the NTM. For the large separation without the explosive burst, two strategies, i.e. a continuous ECCD with static RMP and a modulated ECCD with rotating RMP, are separately investigated. It is shown that when the NTM is decelerated by a relatively slow rotating RMP, the modulated ECCD can have a better stabilizing effect. In addition, the ECCD deposition widths in both radial and helical angle directions, as well as the ECCD on-duty time, are analyzed in detail. The best effectiveness of ECCD is obtained and the relevant physical mechanisms are discussed.

【 授权许可】

Unknown