New chromaticity compensation approach and dynamic aperture increase in the SSRF storage ring

Abstract

TIAN Shun-Qiang( ) 1,2 HOU Jie( ) 1,2CHEN Guang-Ling( ) 1,2 LIU Gui-Min( ) 1;1)

Design and first commissioning of a new mode with lower emittance in the SSRF storage ring

“…Because the structure of the SSRF storage ring was optimized for the nominal mode, in addition to the stronger nonlinearities, nonlinear optimization of the new mode is very difficult. We have made extensive attempts by means of several methods, such as a step-by-step chromaticity compensation [4] , resonance approach [5] and Frequency Map Analysis [6] , to finally get an acceptable nonlinear solution. The sextupole strengths of the solution are listed in Table 2, where the chromaticities are compensated to zero for both the transverse planes.…”