H. Tomizawa, T. Sato, K. Ogawa, K. Togawa, T. Tanaka, T. Hara, M. Yabashi, H. Tanaka, T. Ishikawa, T. Togashi, S. Matsubara, Y. Okayasu, T. Watanabe, E.J. Takahashi, K. Midorikawa, M. Aoyama, K. Yamakawa, S. Owada, A. Iwasaki, K. Yamanouchi. Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling[J]. High Power Laser Science and Engineering, 2015, 3(2): 02000001