Multifaceted asymmetric radiation as well as strong poloidal asymmetry of the electron density from the edge, dubbed as 'MARFE', has been observed in high electron density Ohmically heated plasmas on J-TEXT tokamak. Equilibrium reconstruction based on the measured data from the 17-channel FIR polarimeter–interferometer indicates that an asymmetric plasma current density distribution forms at the edge region and the plasma current shrinkage locates at the MARFE affected region. Furthermore, associated with the localized plasma current shrinkage, a locked mode MHD activity is excited, which then terminate the discharge with a major disruption. Localized plasma current shrinkage at the MARFE region is considered to be the direct cause for the density limit disruptions, and the proposed interpretation is consistent with the experimental observations.
多面非对称辐射以及边缘电子密度的强极向非对称性（被称为“MARFE”）已在J-TEXT托卡马克高电子密度欧姆加热等离子体中被观测到。基于17通道法拉第旋转干涉仪测量数据的平衡重建表明，在MARFE影响区域形成了非对称等离子体电流密度分布，且等离子体电流收缩定位于MARFE区域。此外，与局域电流收缩相关的锁模磁流体动力学不稳定性被激发，最终导致等离子体破裂。局域等离子体电流收缩被认为是密度极限破裂的直接原因，所提出的解释与实验观测结果一致。