Study of Terahertz-band Sheet Electron Beam Extended Interaction Oscillators

Our recent research regarding sheet beam extened interacion oscillators (SB-EIOs) are presented in this paper. In recent years, we have conducted the research of terahertz-band SB-EIOs around two issues: (1) to increase the output power, and (2) to extend the tunable frequency bandwidth. For the first issue, the idea of combining the advantages of a ladder-like interaction circuit (high gain per unit length) and a pseudospark-sourced sheet electron beam (high beam current density and large beam cross-sectional area) is proposed. Such an idea was experimentally verified by using hot-test results. For the second issue, the concept of multiple-mode operation has been proposed to replace the traditional single-mode operation. Such a methodology so far has been initially confirmed by using cold-test results.