1. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu, 509-5292, Japan
2. Sukegawa Electric. Co., Ltd., 3333-23 Kamitezuna, Takahagi, Ibaraki, 318-0004, Japan
3. Kyoto Univ., Kyoto daigaku-Katsura, Nishikyo, Kyoto, 615-8540, Japan
4. Kyushyu Univ., 6-1 Kasuga-Koen, Kasuga, 816-8580, Japan
5. Okayama Univ., 1-1-1 Tsushima-naka, Kita-ku, Okayama, 700-8530, Japan