Numerical study on the stabilization of neoclassical tearing modes by electron cyclotron current drive

• DOI: 10.1063/1.4913352
• Publication Date: 2015-02-23T18:00:29Z
• Authors: Xiaoguang Wang; Xiaodong Zhang; Bin Wu; Sizheng Zhu; Yemin Hu
• Keywords: Tearing; Duty cycle; Bootstrap current; Modulation (music)

It is well known that electron cyclotron current drive (ECCD) around the o-point of magnetic island along plasma direction can stabilize neoclassical tearing modes (NTMs) in tokamak devices. The effects radial misalignment between and driven current, phase misalignment, on-duty ratio for modulated on NTM stabilization are studied numerically this paper. A small found to significantly decrease stabilizing effect. When a sufficiently large occurs ECCD, effect also reduced lot. optimal ECCD NTMs be range 60%–70%. larger than 50% could mitigate if it not too large. There no benefit from modulation threshold.