1. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5202, Japan
2. Fusion Science Program, The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5202, Japan
3. Department of Physics, Mahasarakham University, Maha Sarakham 44150, Thailand
4. Department of Fusion Science, The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5202, Japan
5. National Institute of Technology, Gakujutsu-Sogo-Center 10F, 2-1-1 Hitotsubashi, Chiyoda-ku 101-0003, Japan