"S. Hatakeyama,M. Soya,H. Tsutsui,S. Tsuji-Iio,R. Shimada,T. Akiyama,K. Y. Watanabe","Helical coils for the positional stability and elongation of tokamak plasma","39th EPS Conference on Plasma Physics","Proceedings of 39th EPS Conference on Plasma Physics",,,," P4.044",2011,June