Emittance tuning of the FCC-ee High Energy Booster ring

Abstract Previous studies for the electron-positron version of the Future Circular Collider (FCC-ee) have highlighted the need to define tolerances on magnet imperfections and develop correction strategies. This is crucial for ensuring the performance of one of the main elements in the acceleration chain: the High Energy Booster (HEB) ring. The efficiency and overall performance of these correction strategies, as well as the magnet field quality and misalignment tolerances, directly influence the specifications of correction magnets. This, in turn, affects key parameters such as beta functions, dispersion, transverse coupling, and emittance. Horizontal and vertical orbit corrections utilize horizontal and vertical kickers, respectively. Skew quadrupoles address vertical dispersion, introduced by normal dipole roll, and transverse coupling. Normal quadrupoles corrects the horizontal and vertical phase advances. This study simulates the distribution of these four corrector types to minimize equilibrium emittance at the extraction energy of 45.6 GeV. The computed strengths of these correctors and the associated misalignments are presented.