Speaker
Description
Beamstrahlung and secondary pair production are relevant sources of backgrounds but can also be exploited as potential tuning signals at the FCC-ee. They depend on possible IP optics errors and on general beam–beam conditions. Using GUINEA-PIG, we simulate beamstrahlung photon spectra, emitted power, and pair production through Breit–Wheeler, Bethe–Heitler, and Landau–Lifshitz processes for different sets of IP aberrations, including waist shift, vertical dispersion, and transverse coupling. The resulting photon and pair energy–angle distributions are examined, where comparisons with analytical expectations allow for consistency checks. We also compare GUINEA-PIG beamstrahlung predictions with single-turn results delivered by the new code Xsuite, for a further benchmarking of Xsuite's beam-beam simulation package. Our study sheds light on possible beamstrahlung-related signals at the FCC-ee, including electron-positron pair production, and their dependence on the quality of the IP optics tuning.
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