Howling, Emily Gasior, Marek Chambers, Nicolas Kieffer, Robert Krupa, Michal Lefevre, Thibaut Moser, Benjamin Sullivan, Harry Zannini, Carlo Burrows, Philip Geometrical studies for the arc beam position monitors FCC-ee JACoW IBIC 726 2025 The electron-positron Future Circular Collider (FCC-ee) has challenging requirements for beam instrumentation, including the need for thousands of high-resolution beam position monitors (BPMs) presenting low impedance to the circulating beam. This paper details the requirements for the FCC-ee arc BPMs and investigates button-type pickups with various geometries through electromagnetic simulations using FCC-ee design parameters. The simulation results are used to estimate key BPM characteristics, including impedance and heating. eng simulation; impedance; bunching; collider; operation; 2026

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