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The CERN FCC-ee top-up booster synchrotron will accelerate electrons andpositrons from an injection energy of 20 GeV up to an extraction energy between45.6 GeV and 182.5 GeV depending on the operation mode. These accelerated beamswill be used for the initial filling of the high-luminosity FCC-ee collider andfor keeping the beam current constant over time using continuous top-upinjection. Due to the high-intensities of the circulating beams, collectiveeffects may represent a limitation in the top-up booster. In this work wepresent a first evaluation of the impedance model and the effects on beamdynamics. Methods to mitigate possible instabilities will be also discussed.

Study of collective effects in the CERN FCC-ee top-up booster