1. Department of Nuclear Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo, 060-8628 Japan. +81-11-706-7108
2. NBI Heating Laboratory, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193 Japan. +81-29-270-7552