Speaker
Description
Precise modelling of spin dynamics is essential for the energy-calibration programme of the FCC-ee collider, where resonant depolarization measurements require accurate predictions of polarization buildup and of the spin-tune response to machine errors. We present spin modeling capabilities recently implemented in the Xsuite simulation framework, enabling high-performance six-dimensional tracking of particle trajectories together with their spin motion. The module includes the integration of the Thomas–BMT equation and a linearized computation of the invariant spin field (ISF), obtained from the one-turn linear map. Radiative spin effects are incorporated through the Sokolov–Ternov mechanism and its generalizations, allowing the evaluation of equilibrium polarization and of its buildup time.
The new tool has been benchmarked against the BMAD code for representative lattices, covering both spin-closed-orbit properties and long-term polarization evolution.
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