Laser Polarization of an FCC-ee bunch & Electron polarization in the EIC's RCS

• Vahid Ranjbar

Room: https://bnl.zoomgov.com/j/16079025981?pwd=QjMrdXhjdFdaeWFDRzlVcXJKVEp1dz09 Laser Polarization of an FCC-ee bunch: Polarized electron beams are essential for precision measurements at future storage-ring colliders, but conventional self-polarization can take many hours. We model repeated interactions with intense laser pulses and embed the resulting spin and energy kicks in six-dimensional BMAD tracking of an FCC-ee Z-pole bunch. At a beam-preserving operating point, the simulated polarization reaches 0.69% after 100,000 turns with no macroparticle loss, identifying both the promise and practical laser requirements of multishot polarization.