Experimental research on the deeply detached X-point radiator regime on EAST

作者：Baoguo Wang, Rong Yan, Kedong Li, Dahuan Zhu, Rui Ding, B.-L. Zhang, W. Kai, Xin Lin, Binfu Gao, L.Y. Meng, Jianhua Yang, Lin Yu, Yanmin Duan, Jinju Yang, Kangning Geng, Qiuyang Zhang, Tao Zhang, Fudi Wang, Yifei Jin, Hailin Zhao, Bin Zhang, Pengfei Zhou, Chunyu He, Yang Wang, Liang Wang, Junling Chen, the EAST Team · 发表于：Nuclear Fusion · 年份：2025 · DOI：10.1088/1741-4326/ade4da · 被引用次数：5 · 研究领域：Magnetic confinement fusion research、Superconducting Materials and Applications、Nuclear reactor physics and engineering

Abstract Radiative divertor detachment with impurity seeding is considered one of the most promising means for mitigating particle and heat fluxes on the divertor target. To measure the impurity radiation distribution, a tangentially viewing camera system for lower divertor plasma observation has been developed and installed on EAST. A reconstructed 2D distribution of N II line radiation is obtained based on Phillips–Tikhonov regularization, revealing the electron temperature region in the range of 6–10 eV during a nitrogen (N 2 ) seeding experiment. With N 2 seeding, the deep detachment with the stable X-point radiator (XPR) has been achieved on EAST with a tungsten divertor and metal first wall components. The profiles of T et and q t with a distance to the strike point larger than 6 cm ( ρ ∼ 1.06) are radially flat on the outer divertor target in the deeply detached state. The XPR contributes to the effective divertor protection with mitigation of heat/particle fluxes and suppression of divertor target sputtering.