A backward wave oscillator (BWO) based on a double-staggered grating (DSG) slow wave structure (SWS) is investigated as a high-power wideband terahertz (THz) source, driven by a sheet electron beam emitting from a pseudospark plasma cathode. First, the DSG SWS is optimized in simulation to have a suitable dispersion characteristic. Then, the BWO with a wideband output structure consisting of a tapered section of DSG and an L-shaped connector is modeled under an operating voltage of 24–38 kV and a current density of 2– $5\times 10^{{7}}$ A/m2 (beam current of 1.5–3.8 A). A maximum power of 3.9 kW is obtained, and a wide bandwidth of over 38 GHz (343–381 GHz) is achieved. The impact of fabricating errors of the SWS on the performance of the BWO is analyzed in simulation. The effects of the plasma in the interaction space on the BWO performance are also analyzed, showing that the plasma causes an increase in the oscillation frequency by 1.0%–1.2%.

中文翻译：

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伪火花源片状电子束驱动的宽带太赫兹后向波振荡器的研究

基于双交错光栅 (DSG) 慢波结构 (SWS) 的后向波振荡器 (BWO) 被研究为高功率宽带太赫兹 (THz) 源，由赝火花等离子体阴极发射的片状电子束驱动。首先，DSG SWS 在模拟中被优化以具有合适的色散特性。然后，在 24-38 kV 的工作电压和 2- $5\times 10^{{7}} 的工作电压和电流密度下对具有由 DSG 的锥形部分和 L 形连接器组成的宽带输出结构进行建模$ A/m2（射束电流为 1.5–3.8 A）。获得了 3.9 kW 的最大功率，并实现了超过 38 GHz (343–381 GHz) 的宽带宽。仿真分析了SWS的制造误差对BWO性能的影响。