Study on Wideband THz Backward Wave Oscillator Driven by Pseudospark-Sourced Sheet Electron Beam
Study on Wideband THz Backward Wave Oscillator Driven by Pseudospark-Sourced Sheet Electron Beam
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DOI：
10.1109/ted.2020.3005362
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发表时间：
2020-08
影响因子：
3.1
通讯作者：
Jin Zhang;Tianzhong Zhang;Y. Alfadhl;Xiao-dong Chen;Liang Zhang;H. Yin;A. Cross
中科院分区：
文献类型：
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作者：
Jin Zhang;Tianzhong Zhang;Y. Alfadhl;Xiao-dong Chen;Liang Zhang;H. Yin;A. Cross
研究了基于双交错光栅 (DSG) 慢波结构 (SWS) 的后向波振荡器 (BWO) 作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 在仿真中进行了优化，以具有合适的色散特性。然后，在工作电压为 24-38 kV、电流密度为 2- $5\times 10^{{7}}$ A/m2（束流为 1.5-3.8 A）下对具有宽带输出结构（由 DSG 锥形部分和 L 形连接器组成）的 BWO 进行建模。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。还分析了相互作用空间中的等离子体对BWO性能的影响，表明等离子体导致振荡频率增加1.0%–1.2%。
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%.