Moderation of neoclassical impurity accumulation in high temperature plasmas of helical devices by Velasco, J, Calvo, I, Satake, S, Alonso, A, Nunami, M, Yokoyama, M, Sato, M, Estrada, T, Fontdecaba, J, Liniers, M, McCarthy, K, Medina, F, Ph Van Milligen, B, Ochando, M, Parra Diaz, F, Sugama, H, Zhezhera, A, LHD Experimental Team, TJ-II Team