A hybrid REBCO-Cu coating has been proposed as an alternative solution for CERN’s Future Circular Collider (FCC) beam screen. This would allow for acceptable levels of coupling impedance and field quality, ensuring beam stability. In this work, we present field quality simulations of FCC’s beam screen chamber by the means of H-formulation, with REBCO resistivity based on Anderson-Kim’s power law and taking into account Jc dependency with magnetic field intensity and angle obtained from experimental measurements with commercially available REBCO coated conductors. Results show that there are several possible configurations that satisfy both beam stability criteria. We also show that the effect of the AC magnetic field produced by the charged particle beam on the current flowing in the superconductors and, ultimately, on field quality is only relevant under FCC’s operating conditions for high magnetic fields, possibly increasing field quality in such scenario. Finally, trapped field measurements are performed on delaminated REBCO tapes, with striation patterns according to the simulation settings, confirming that trapped field decreases considerably with the introduction of alternating stripes of copper and REBCO.

Keywords: FCC, Beam Screen, REBCO Superconductor, Field Quality Simulations