Design of an Overmoded MW-Class Terahertz Backward Wave Oscillator
Results of the theoretical and numerical simulation studies of a mega watt, large diameter terahertz backward wave oscillator are presented in this paper. The device consists of a large cross-section (overmoded), slow wave structure (SWS) with a unique profile of wall radius specifically designed to support surface wave and to provide a strong beam-wave coupling at moderate voltage. The Particle-in-cell simulation method is used to study the effects of device parameters which are critical to the optimization of output power in a prototype 0.14 THz backward wave oscillator. Numerical results demonstrate that both the total length of SWS and length of back drift tube affect the output power remarkably, while the slot width is responsible for mode transformation. It is also found that the steady-state, singlefrequency operation in this overmoded situation could be realized by the characteristic of surface wave near upper cutoff point.
overmoded high power terahertz source surface wave backward wave oscillator
Hai Zhang Jianguo Wang
School of Electronic and Information Engineering,Xian Jiaotong University,Xian 710049,China Northwest Institute of Nuclear Technology,Xian,710024,China
国际会议
广州
英文
2008-11-19（万方平台首次上网日期，不代表论文的发表时间）