1. National Institute for Fusion Science, Toki 509-5292, Japan
2. KASTEC, Kyushu University, Kasuga 816-8580, Japan
3. Fukuoka Institute of Technology, Fukuoka 811-0295, Japan
4. Korea Atomic Energy Research Institute, Daejeon, Korea
5. National Fusion Research Institute, Daejeon, Korea
6. Thomas Keating Ltd., Station Mills, Billinghurst, West Sussex RH114 9SH, UK