Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2006, Vol. 17 ›› Issue (1): 1 doi: 10.1016/S1001-8042(06)60001-8


Effects of insertion device on SSRF storage ring

ZHANG Li-Hua LIAO Yi LIU Gui-Min   

  1. Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800, China
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ZHANG Li-Hua LIAO Yi LIU Gui-Min. Effects of insertion device on SSRF storage ring.Nuclear Science and Techniques, 2006, 17(1): 1     doi: 10.1016/S1001-8042(06)60001-8

Abstract: Shanghai Synchrotron Radiation Facility (SSRF), one of the third generation light sources, aims to pro-duce high brightness and/or high flux X-ray source for users; therefore insertion devices (IDs) are important magnetic elements for SSRF. In this paper, the linear perturbations due to IDs toward its storage ring lattice, such as beta func-tion distortions, tune shifts, emittance growths, and energy spreads are estimated by using analytical formulae, and the nonlinear effects from IDs, especially dynamic aperture, are simulated by using Racetrack code. The results show that (a) the reduction of dynamic aperture from single undulator is negligible, since electron beam energy of 3.5 GeV is high and ID’s magnetic field is low, and the beta functions in the middle of straight sections, where ID is located, are well optimized; (b) however, the reduction from single wigglers, especially super-conducting wiggler, is visible, be-cause of its higher magnetic field; (c) effects of each ID on emittance growths and energy spreads are less than 7%.

Key words: SSRF, Insertion devices, Linear optics distortion, Compensation, Dynamic aperture