Dependence of ELM instability on separatrix density in EAST long-pulse H-mode plasmas oleh Y.F. Wang, G.Z. Jia, G.S. Xu, R. Chen, L. Chen, N. Yan, L. Wang, Q. Zang, T. Zhang, Y.M. Duan, T.F. Zhou, Y.F. Jin, M.R. Wang, H.Q. Liu, W. Gao, Y.W. Yu, G.H. Hu, Q.Q. Yang, K.D. Li, X. Lin, Y. Ye, Z.Y. Liu, H.Q. Wang, J. Huang, X.Z. Gong, EAST Teams