• [1]

    G. Brown, K. Halbach, J. Harrio and H. Winick, N. I. M., 208(1983), 65.[2] M.W.Pool and R. P. Walker, Periodic magnets for undulators and free electron laser, the In-ternational Conference on Magnet Technology, 1981.[3] E. Hoyer et al., IEEE Trans., NS-30(1983), 3118.[4] 刘茂三等, Proceedings of the Second China-Japan Joint Symposium on Accelerators for Nuclear Science and Their : Applications, 265, Institute of Modern Physics, 1983.