Effects of insertion device on SSRF storage ring

Effects of insertion device on SSRF storage ring 1 first-author 1 1 Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800, China Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800, China Shanghai Synchrotron Radiation Facility (SSRF), one of the third generation light sources, aims to produce 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 function 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, because of its higher magnetic field; (c) effects of each ID on emittance growths and energy spreads are less than 7%. SSRF Insertion devices Linear optics distortion Compensation Dynamic aperture References Robert A . Lattice and Emittance , CERN 98-04 , 1998 Lattice and Emittance SPEAR3 Concept Design Report, 8/30/99 SPEAR3 Concept Design Report, 8/30/99 Diamond Concept Design Report , July 2003 Diamond Concept Design Report Martirosyan Y , Ivanyan M , Khachatryan M et al . Non-linear beam dynamics study in Candle light source , Proceedings of EPAC 2002 , Paris, France Non-linear beam dynamics study in Candle light source Walker R P . Insertion devices: undulators and wigglers , CERN 98-04 , 1998 Insertion devices: undulators and wigglers Wille K . Introduction to insertion devices , CERN 98-04 , 1998 Introduction to insertion devices Iazzourene F . Racetrack user's guide , Version 4.01 , July 1992 Racetrack user's guide Wiedemann H . Particle Accelerator Physics, A USPAS PROGRAM , Vol. 2 , 1998 Particle Accelerator Physics, A USPAS PROGRAM Jin Yumin . Electron storage ring physics (in Chinese) , University of Science and Technology of China Press , 2001 Electron storage ring physics (in Chinese) Helm R H , Lee M J , Morton P L . IEEE Trans Nucl Sci , 1973 , NS-20 : 3 IEEE Trans Nucl Sci 10.1016/S1001-8042(06)60001-8 TL593 2004-10-15 2006-02-20 2021-01-19 2006 Nuclear Science and Techniques 01 17