New chromaticity compensation approach and dynamic aperture increase in the SSRF storage ring |
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| Authors: | TIAN Shun-Qiang HOU Jie CHEN Guang-Ling LIU Gui-Min ) |
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| Affiliation: | [1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | ![]()
Strong chromatic sextupoles used to compensate natural chromaticities in the third generation light source storage ring usually reduce dynamic aperture drastically. Many optimization methods can be used to find solutions that provide large dynamic apertures. This paper discusses a new optimization approach of sextupole strengths with step-by-step procedure, which is applied in the SSRF storage ring, and a better solution is obtained. Investigating driving terms generated by the sextupoles in every step can analyze their convergences and guide the weight setting among different terms in object function of the single resonance approach based on the perturbation theory. |
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| Keywords: | SSRF storage ring chromaticity compensation nonlinear optimization dynamic aperture sextupole |
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