Design, Simulation, and Cold Test of a W-Band Double Nonparallel Staggered Grating Backward Wave Oscillator
Design, Simulation, and Cold Test of a W-Band Double Nonparallel Staggered Grating Backward Wave Oscillator
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DOI：
10.1109/ted.2022.3195484
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发表时间：
2022-10
影响因子：
3.1
通讯作者：
Jin Zhang;Y. Alfadhl;Xiao-dong Chen;Liang Zhang;A. Cross
中科院分区：
文献类型：
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作者：
Jin Zhang;Y. Alfadhl;Xiao-dong Chen;Liang Zhang;A. Cross
提出了一种新型的双非平行交错光栅慢波结构，用于提高赝火花源片状电子束驱动的${W}$波段返波振荡器的耦合阻抗。模拟结果表明，DNPSG慢波结构具有72-125 GHz的宽带带宽，与传统的双交错光栅慢波结构相比，DNPSG慢波结构具有更高的耦合阻抗。设计并制作了由10个慢波结构单元和宽带输出结构组成的DNPSG返波管结构。在DNPSG返波管的冷态测试中，测试结果表明，在大部分频带内，DNPSG返波管的S_{11}$（损耗为DNPSG返波管的2倍）均在-10 dB以上，满足了伪火花驱动大功率器件的要求。在束流电压为14-90 kV，电流密度为1.5 ~ 5.10 7A/m2的条件下，采用粒子模拟方法对DNPSG返波管的热态性能进行了分析。190千瓦）的超宽调谐频带的38 GHz（75-113 GHz），由于增强的耦合阻抗。
A novel double nonparallel staggered grating (DNPSG) slow wave structure (SWS) is proposed to enhance the coupling impedance in a ${W}$ -band backward wave oscillator (BWO) driven by a pseudospark-sourced sheet electron beam. The DNPSG SWS has been shown a broadband of 72–125 GHz and a higher coupling impedance compared with the traditional double staggered grating (DSG) SWS in simulation. The DNPSG BWO structure consisting of ten SWS units and a broadband output structure is designed and fabricated. In the cold test of the DNPSG BWO, the measured ${S}_{11}$ (double of the losses in the DNPSG BWO) is above −10 dB in most of the band, which is satisfactory in the pseudospark-driven high-power device. The hot-test performance of the DNPSG BWO is analyzed by particle-in-cell (PIC) simulation in a beam voltage range of 14–90 kV and a current density range of 1.5– $5\times10$ 7 A/m2, obtaining a high output power (max. 190 kW) over an ultrawide tuning band of 38 GHz (75–113 GHz) due to enhanced coupling impedance.