Beamstrahlung in Extremely High Energy Colliders

Beamstrahlung is the coherent beam-beam process (in colliders) where an electron emits synchrotron radiation due to the field of the opposing beam. In high energy colliders, it is a major hindrance in achieving high energy collisions at the interaction point, and hence it is essential to understand its effect in order to achieve the desired collision parameters in future 10 TeV Wakefield Accelerator Colliders. This effect is characterized by the beamstrahlung parameter ϒ, which characterizes the field strength in terms of the Schwinger limit. Low ϒ corresponds to the classical regime and high ϒ corresponds to the quantum regime. In the classical regime, collision metrics such as the luminosity enhancement, luminosity spectrum, electron spectrum, photon spectrum, and γγ-luminosity spectrum are well understood. However, work remains to be done to understand the quantum beamstrahlung regime. Using the Guinea-Pig and WarpX simulation codes for beam-beam collisions on NERSC's Perlmutter architecture, we benchmark simulation results with theory in the classical regime, and we present progress in understanding beam-beam collisions in the quantum beamstrahlung regime.