A dielectric loaded higher order mode THz electron injector

A dielectric loaded cavity operating in TM012 mode is designed to be used as electron injector into a THz accelerator. The designed cavity works at 360 GHz and uses about 3mJ of Thz energy. The designed gun is capable of generating electron bunches with 200 keV average energy. The bunch length and the transverse emittance of the bunch at gun exit are 5 μm and 25 π nm rad respectively. Furthermore an intrinsic focusing field at the end of the cavity, focuses the beam to 1 μm transverse size.