1. Department of Nuclear Engineering, Seoul National University, Seoul 08826, Republic of Korea
2. United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
3. Center for Relativistic Laser Science, Institute for Basic Science, Gwangju 61005, Republic of Korea
4. Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea