Effect of Oversized Factor on 0.1 THz Surface Wave Oscillator

Abstract

Surface wave oscillator (SWO) is an intense subterahertz wave source based on the interaction of an electron beam with a surface wave in a cylindrical corrugated waveguide (CCW). The oversized factor is a key parameter of SWO and is the ratio of the CCW diameter to the wavelength of a generated wave. In this study, we experimentally examine 0.1 THz SWO with different oversized factors of 10 and 7. For an oversized factor of 7, a kilowatt class radiation with a maximum efficiency of 8% is observed. SWO operation can be improved by decreasing the factor from 10 to 7.