Speaker
Description
The 100 km FCC-ee e+/e- circular collider requires luminosities in the order of 10^35 cm^-2 s^-1 and very low emittances of 1nm for eps_x and 2pm for eps_y. In order to reach these requirements, extreme focusing of the beam is needed in the interaction regions, leading to a vertical beta function of 2mm at the IP. These challenges make the FCC-ee design particularly susceptible to misalignment and field errors. This talk describes the tolerance of the machine to magnet alignment errors and the effectiveness of optics and orbit correction methods that were implemented in order to bring the vertical dispersion to reasonable values. As betatron coupling is also a very important source of emittance growth, its correction has been integrated to the challenging correction scheme to keep the vertical emittance as low as possible. Thousands of misalignment and error seeds were introduced in madx simulations and a comprehensive correction strategy was implemented. The results are summarised in this talk.
