1. National Fusion Research Institute, 169-148 Gwahak-ro, Yuseong-gu, Daejeon 34133, South Korea
2. National Institute Fusion Science, Toki, Gifu 509-5292, Japan
3. Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, South Korea