• [1]

    . Battocletti J H. IEEE-MAG-81, 1985, 5: 1874-18762. CZOK U et al. Nucl. Instrum. Methods, 1977, 140: 39-453. ZHANG Shu-Xiu. Nuclear Physics Review, 1987, 2: 36-41(in Chinese)(张恕修等. 原子核物理评论, 1987, 2: 36-41)4. PAN Hui-Bao et al. Journal of Vacuum Science and Tech-nology, 1981, 1: 54-62(in Chinese)(潘惠宝等. 真空科学与技术学报, 1981, 1: 54-62)