1. NIFS, Toki-shi, Gifu-ken 509-5292, Japan
2. JAEA, Naka-machi, Ibaraki-ken 311-0193, Japan
3. St. Petersburg State Tech. Univ., St. Petersburg 195251, Russia
4. National Fusion Research Center, Daejeon 305-806, Korea
5. Daido Inst. Tech., Nagoya 457-8530, Japan