1. National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan
2. Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro 152-8550, Japan
3. Kansai University, 3-3-35 Yamate, Suita 564-8680, Japan
4. Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Fukuoka 811-0295, Japan
5. University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
6. Kyushu University, 6-1 Kasuga-Koen, Kasuga 816-8680, Japan