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. ZOU P, XIAO L L, SUN X et al. J. Appl. Phys., 2001,90(4): 2017-20232. WU Cong-Feng, LIN Hui, WANG Lin et al. Proceedings of 2007. Particle Accelerator Conference. Albuquerque, NewMexico, USA, 2007, 2149-2151