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TY - UNPB AU - Yu, L. AU - Feng, J. AU - Kaiser, A. AU - Liu, J.Z. AU - Schaff, O.S. AU - Sun, J.G. AU - Tang, W.X. AU - Tromp, R.M. AU - Wan, W. AU - Wei, Z. AU - Wu, S.J. AU - Yang, X.D. AU - Zheng, C.X. AU - Zhu, L. ED - Ko, Kwok C. ED - Schaa, Volker R.W. ED - Tang, Chuanxiang ED - Yan, Heping TI - Design of Ultrafast Spin Polarized Electron Gun J2 - Proc. of ICAP2015, Shanghai, China, 12-16 October 2015 C1 - Shanghai, China T2 - International Computational Accelerator Physics Conference T3 - 12 LA - english AB - We describe a design for ultrafast spin polarized electron gun, which will be incorporated into the high resolution aberration-corrected LEEM/PEEM and HT-STM system at Chongqing University. The addition of spin-polarized ultrafast electron source complements the standard cold field emission electron source and expands the analytical capabilities of the system, permitting research in spin dynamics and low dimensional magnetism. With the necessary ancillary electron optical components, the spin gun can realize time resolved aberration-corrected spin-polarized LEEM (TR-AC-SPLEEM) at high spatial (2 nm) and temporal (10 ps) resolution. This design takes advantage of the high electron-optical symmetry of the AC- LEEM design to minimize deleterious effects of space-charge force and time broadening, while maintaining full control of the electron spin. Meanwhile, we also consider the coherence length of electron beam in our system. We find that our system can operate with the transverse coherence length of 4nm and longitudinal coherence length of 13 nm at the sample, respectively. PB - JACoW CP - Geneva, Switzerland ER -