1. National Institute for Fusion Science, The Graduate University for Advanced Studies 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
2. Vinča Institute of Nuclear Sciences, POB 522, 11001 Belgrade, Yugoslavia and National Institute for Fusion Science, Theory and Computer Simulation Center 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
3. National Institute for Fusion Science, Theory and Computer Simulation Center 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
4. Earth Simulator Center, 3173-25 Showa-cho, Yokohama-shi 236-0001, Japan