Guoxiang Shu1, Guo Liu2, Le Chen3, Hasitha Bambarandage4 and Zhengfang Qian5
http://iopscience.iop.org/article/10.1088/1361-6463/aaa20e/pdf
Terahertz (THz) radiation obtained from the interaction between multiple sheet electron beams and a high-order mode (HOM) provides an effective method to extend the operating frequency and power capacity. Two ridges were introduced in the double staggered grating waveguide slow wave structure (SWS) to achieve a suitable band-gap between the HOM and low-order mode (LOM) for the HOM operation of a backward wave oscillator (BWO). The dispersion and transmission simulations of this improved SWS showed that a good frequency selective property was achieved and the LOM competition was effectively suppressed. Particle-in-cell analysis predicted that the HOM BWO could radiate >0.46 W output power in the range of 1.19-1.24 THz. It is indicated that the HOM BWO is a promising compact radiation source for generating high power THz-wave.
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