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Description
At CERN’s Future Circular Collider (FCC-ee), the beamstrahlung photon beams produced at each interaction point carry several hundred kilowatts of power, requiring a reliable and thermally efficient absorber. Building upon an initial slope-based liquid-lead concept, this work investigates two improved configurations: 1) a double-slope geometry, designed to mitigate photon backscattering observed in earlier designs; and 2) an inclined slope section with an accumulation pool at the back, intended to maximize photon absorption, reduce system size, and ensure thermal and flow stability. Both concepts operate under an inert argon atmosphere and target an effective absorption thickness of 10–20 cm, with a liquid-lead mass flow rate of approximately 300 kg/s. Monte Carlo simulations are employed to compute photon energy deposition, while multiphase computational fluid dynamics (CFD) analyses characterize the coupled thermal and hydrodynamic behavior. The results compare the performance of the two configurations and identify key parameters for further optimization of the FCC-ee liquid-lead photon dump system.
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