1. Laser Technologies Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Department of Nuclear Engineering, Hanyang University, Wangsimni-ro 222, Seongdong-gu, Seoul 04763, Republic of Korea
3. Department of Nuclear and Quantum Engineering, KAIST, Daehak-ro 291, Yuseong-gu, Daejeon 34141, Republic of Korea