THz-driven split ring resonator undulator

We propose a short period undulator based on the electromagnetic field pattern in THz-driven split ring resonator structure. An analytical model is developed that allows us to assess key performance parameters of and estimate emitted radiation spectrum. Different geometric configurations are compared detail using numerical simulations. A 100 MeV electron bunch with 5 pC charge shown emit narrow band 83 eV photon pulses peak brightness approximately ${10}^{19}\text{ }\mathrm{photons}/(\mathrm{s}\text{ }{\mathrm{mrad}}^{2}\text{ }{\mathrm{mm}}^{2}\text{ }\text{ }0.1%\text{ }\mathrm{BW})$ when passing through mm long 1 period.