Twisted THz radiation from a prebunched relativistic electron beam using an ion channel guiding and helical magnetic wiggler

This study explores the enhancement of twisted terahertz (THz) radiation power by using a novel approach leveraging a relativistic electron beam modulated by twisted lasers. The modulated beam propagates through a helical magnetic wiggler and ion channel guiding that induces a transverse modulation in the electron density. The magnetic wiggler deflects the electron trajectories resulting in the emission of THz photons with a twisted phase structure. Our numerical results reveal a significant increase in THz power with rising ion channel frequency, peaking at a critical point where resonance is approached. Furthermore, we observe that maximum THz power is tunable with introduction of ion channel density and relativistic electron beam velocity. In present study, ion channeling also improves the twisted THz radiation power to the order of ∼ ${10}^{-2}$corresponding to beam energy of $1.64\mathrm{MeV}$ approximately, which increase by nearly order of magnitude compared to previously reported values.