1. National Institute of Technology, Toyama College, 13 Hongo-mach, Toyama 939-8630, Japan
2. National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki, Gifu 509-5202, Japan
3. SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki, Gifu 509-5202, Japan
4. Department of Energy Systems Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea
5. School of Engineering, Tohoku University, 6-6-01-2 Atamaki aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan
6. Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan