A high-power subterahertz surface wave oscillator with separated overmoded slow wave structures

Wang Guang-Qiang^{1, 2}, Wang Jian-Guo^{1, 3, †,}, Zeng Peng^{1, 2}, Wang Dong-Yang^{1, 2}, Li Shuang^{1, 2, 3}

Interaction width Δk versus beam energy at a beam current of 1 kA. The solid line represents the fitted curve of the discrete Δk (solid circles), and the dashed lines represent 2π/L for different values of L.