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TY - UNPB AU - Bogomyagkov, A.V. ED - Li, Ying-ying ED - Li, Lu ED - Schaa, Volker RW TI - Systematic Errors Between Beam Energy and Spin Tune at FCC-ee J2 - Proc. of eeFACT2018, Hong Kong, China, 24-27 September 2018 CY - Hong Kong, China T2 - ICFA ABDW on High Luminosity Circular e$^+$e$^-$ Colliders T3 - 62 LA - english AB - The goal of beam energy calibration is to define central mass energy at the interaction point (IP). The most accurate method is resonant depolarization technique with relative error of 1 ppm in single beam energy calibration. The whole procedure consists of measurement of spin precession frequency, and calculations of beam energy averaged over circumference, beam energy at IP and central mass energy. The talk is discussing errors introduced on each step of central mass energy determination. PB - JACoW Publishing CP - Geneva, Switzerland ER -