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The FCC-ee injector complex aims to deliver tunable, high-charge electrons and positron bunches for injection into the booster ring first and the final collider ring. The injector complex includes multiple linacs that sequentially boost the energy of the bunches to the booster injection energy of 20 GeV. This work addresses the significant challenges posed by the required beam parameters. We investigated the transverse and longitudinal dynamics considering static and dynamics effects as well for single- and multi-bunch. The design underwent several iterations in the past 3 years. This paper summarizes the design and optimization studies which brought to the present layout, which meets all current requirements for efficient injection into the booster ring, paving the way for the ambitious operational goals of the FCC-ee accelerator complex.
