LAUSR

A novel type of two-section folded wave- guide (TSFW) slow wave structure for the development of a subterahertz (sub-THz) extended interaction oscillator (EIO) is proposed in this paper. We focus on the development of sub-THz EIO, in which the key parts, including the electron optics system, the high frequency structure for beam–wave interaction, and output window, are fabricated and tested. Based on the key parts, the prototype of EIO is developed. The experimental results show that over 12-W output power at the frequency of 107.9 GHz at 2% duty cycle is achieved. This paper demonstrates that the feasibility of a high power THz oscillator can be obtained by the use of a prebunching electron beam produced by TSFW.