[1] Kyoto Univ, Grad Sch Energy Sci, Kyoto 6110011, Japan
[2] RRC Kurchatov Inst, Nucl Fus Inst, Moscow 123182, Russia
[3] Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu 5095292, Japan
[4] Kyoto Univ, Inst Adv Energy, Kyoto 6110011, Japan
[5] Ecole Polytech Fed Lausanne, Ctr Rech Phys Plasmas, Assoc Euratom Suisse, CH-1015 Lausanne, Switzerland