THz-driven Electron Deflection for Streaking and Undulators

In recent years, it has been shown that intense THz pulses are powerful tools to manipulate, deflect or accelerate ultrashort electron bunches. The THz range is of interest, since the corresponding wavelengths are well-matched to a typical electron bunch size of several tens of microns. Here, we propose to use split-ring resonators (SRR) as key-elements to realize various tasks in electron accelerators. Through a judicious choice of shape and geometry these structure exhibit a considerable near-field enhancement, boosting the incident THz field strength by a factor of ten or more.