1. Central Research Institute of Electric Power Industry, Iwadokita 2-11-1, Komae-shi, Tokyo, 201-8511, Japan
2. Kawasaki Plant Systems, Ltd., MinamiSuna 2-11-1, Koto-ku, Tokyo, 136-8588, Japan
3. Graduate School of Frontier Sciences, the Univ. of Tokyo, Kashiwanoha 5-1-5, Kashiwa-shi, Chiba, 277-8583, Japan
4. High Temperature Plasma Center, the Univ. of Tokyo, Kashiwanoha 5-1-5, Kashiwa-shi, Chiba, 277-8568, Japan