# Beam-beam Blowup in the presence of x-y coupling sources at FCC-ee

## TL;DR

This paper investigates how x-y coupling sources affect beam-beam effects, including beamstrahlung and dynamic changes at the Interaction point, in the high-energy FCC-ee collider design.

## Contribution

It provides a detailed analysis of beam-beam effects in FCC-ee considering x-y coupling, which is crucial for optimizing collider performance at high energies.

## Key findings

- X-y coupling influences beam-beam interactions significantly.
- Beamstrahlung limits beam lifetime at high energies.
- Dynamic effects alter beta functions and emittances at the IP.

## Abstract

FCC-ee, the lepton version of the Future Circular Collider (FCC), is a 100 Km future machine under study to be built at CERN. It acquires two experiments with a highest beam energy of 182.5 GeV. FCC-ee aims to operate at four different energies, with different luminosities to fulfil physics requirements. Beam-beam effects at such a high energy/luminosity machine are very challenging and require a deep understanding, especially in the presence of x-y coupling sources. Beam-beam effects include the beamstrahlung process, which limits the beam lifetime at high energies, as well as dynamic effects at the Interaction point (IP) which include changes in the beta functions and emittances. In this report, we will define the beam-beam effects and their behaviours in the FCC-ee highest energy lattice after introducing x-y coupling in the ring.