Low-alpha optics design for SSRF

SYNCHROTRON SCIENCE AND TECHNOLOGY

Low-alpha optics design for SSRF

WANG Xin，

TIAN Shunqiang，

LIU Guimin

Nuclear Science and Techniques

Vol.21, No.3

pp.134-140

Published in print 20 Jun 2010

DOI：10.13538/j.1001-8042/nst.21.134-140

36900

In this paper, short pulse radiation in Shanghai Synchrotron Radiation Facility (SSRF) is generated by the low momentum compaction factor (α_C) optics, and three kinds of the low-α_C optics are found, with the very low α_C being adopted by reducing dispersion in the straight section to negative value in the SSRF. Energy acceptance is selected as objective functions in nonlinear optimization rather than the second order α_C or other nonlinear driving terms. The optimal result is improved step-by-step by randomly setting harmonic sextupole strengths. Two optics modes, i.e. low positive α_C and low negative α_C, are analyzed. In order to get a large energy acceptance and only one stable point in longitudinal phase space, the low negative α_C optics is taken as an operation mode for the short pulse radiation in the SSRF.

SSRFlow-αCbeam optics designnonlinear optimizationand energy acceptance

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