1. Japan Atomic Energy Agency, 178-4
Wakashiba, Kashiwa 277-0871, Japan
2. National Institute for Fusion
Science, 322-6 Oroshi-cho, Toki 509-5292,
Japan
3. SOKENDAI (The Graduate University for Advanced
Studies), 322-6 Oroshi-cho, Toki 509-5292,
Japan