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Description
The FCC-ee injector complex is designed to deliver tunable, high-charge electron and positron bunches for injection into a collider operating at center-of-mass energies between 90 and 365 GeV. The complex comprises several linacs that sequentially boost the bunch energy up to the booster injection energy of 20 GeV. The most critical stage is the high-energy (HE) linac, which accelerates the beams from approximately 3 GeV to 20 GeV. In this work, we present detailed beam-dynamics studies aimed at minimizing emittance growth and optimizing transverse beam stability along the HE linac and at its exit. We perform comprehensive simulations exploring different phase-advance choices per cell and variations in the spacing of lattice elements. Based on these studies, we compare possible configurations and identify a final design, which is then used to optimize the radio-frequency structures. This paper summarizes the full design and optimization effort, demonstrating that the proposed HE-linac configuration satisfies the current performance requirements for efficient injection into the booster ring, thereby supporting the ambitious operational goals of the FCC-ee accelerator complex.
| In which format do you inted to submit your paper? | LaTeX |
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