1. Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
2. Department of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea
3. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States
4. Department of Mechanical Engineering, University of California Riverside, Riverside, California 92521, United States
5. DEMO Technology Division, National Fusion Research Institute, Daejeon 34133, Republic of Korea
6. Korea District Heating Corporation, Seoul 13585, Republic of Korea