FCC-ee spin tracking and polarization studies (FCC-ee SPIN-POL)
The centre-of-mass energy calibration based on resonant depolarization of the stored beams is a cornerstone of the unique precision measurement programme of FCC-ee. The present project aims at first confirming the technical feasibility and the performance of the FCC-ee collider scheme proposed in the CDR, by sufficiently detailed simulations; in particular by completing the study of the depolarization method. Secondly by The existing simulation codes for luminosity and polarization must be unified, while calculating both the spin tune and the IR centre-of-mass energy. The relationship between these two quantities and its sensitivity to tuning knobs, centre-of-mass energy and various imperfections should be investigated and if possible mitigated.