Theoretical Research on a TM02 Mode Terahertz Extended Interaction Oscillator

An overmoded terahertz (THz) extended interaction oscillator (EIO) with high beam loading capability is presented. Through the reconstruction of the high-order mode field, a super-large beam processing mechanism is established. It proves that the overmoded operation oriented by increasing the circuit size has more potential technology expansions related to beam-wave energy conversion. This EIO is driven by annular electron beam with operating voltage 28.4kV and current 0.7 A. Beam with outside diameter 3.56mm and inside diameter 3.3mm is designed. Through particle in cell (PIC) simulation, the circuit is proved to achieve kilowatt-level output power at 0.1 THz when operating stably in TM02 mode.