Improvements in the Guinea-Pig Simulation Framework for Incoherent Pair Creation at the FCC-ee

The FCC-ee will operate at extremely high luminosities, producing intense beam-beam interactions that generate substantial detector backgrounds. These backgrounds can heavily impact detector occupancy and risk saturating the front-end electronics, making accurate modeling essential for detector design. A major source of these luminosity-induced backgrounds is Incoherent Pair Creation (IPC), in which beamstrahlung photons interact with real or virtual photons in the opposing beam to produce secondary electron-positron pairs. We present a set of improvements to the Guinea-Pig simulation software for modeling IPC using FCC-ee beam parameters at the Z-pole. These include implementing boundary conditions for particle propagation, ensuring generated pairs are transferred to the detector simulation while still within the beam-pipe to capture perfect-conductor interactions, adding the detector magnetic field in the simulation, and correcting the magnetic field propagation model. We then evaluate the effect of these updates on the predicted occupancy in the CLD and IDEA vertex detectors, providing a more realistic estimate of background conditions critical for optimizing these detectors for the FCC-ee.