Radiative divertor behavior and physics in Ar seeded plasma on EAST

Chen Jingbo^{1, 2}, Duan Yanmin¹, Yang Zhongshi^{1, 2, †}, Wang Liang¹, Wu Kai^{1, 2}, Li Kedong^{1, 2}, Ding Fang¹, Mao Hongmin¹, Xu Jichan^{1, 2}, Gao Wei¹, Zhang Ling¹, Wu Jinhua¹, Luo Guang-Nan^{1, 2}, EAST Team

(color online) Time trace of major types of impurity in upper divertor region: (a) Ar, (b) C, (c) Li, and (d) W, which were observed by divertor tungsten spectroscopy. There was no evident change of tungsten after Ar seeding in this shot.