1. [1] K. Yamazaki and Y. Abe, Tokastar: Tokamak-Stellarator Hybrid with Possible Bean-Shaped operation, Research Report of the Institute of Plasma Physics, Nagoya, Japan,IPPJ-718 (1985).
2. [2] Y. Taira, K. Yamazaki, H. Arimoto and T. Shoji, Plasma Fusion Res. 5, S1025 (2010).
3. [3] J. Fujita et al., IEEE Trans. Plasma Sci. PS-9, 180 (1981).
4. [4] M. Hasegawa, K. Yamazaki, H. Arimoto, T. Oishi, K. Baba, M. Suwabe and T. Shoji, Plasma Fusion Res. 6, 2402141 (2011).