High power vacuum electronic devices of the millimeter wave to terahertz regime are attracting extensive interest due to their potential applications in science and technologies. In this paper, a novel sheet beam (SB) folded waveguide (FWG) slow-wave structure (SWS) is applied and studied for enhanced output power of oscillators. Through the analysis of high-frequency characteristics of the SB FWG-SWS, the selection of an appropriate beam–wave interaction point on the dispersion curve and beam position is determined for an SB folded waveguide oscillator (FWO) operating near the 2π stopband point. The fundamental mode operation of the SB FWO was verified by the particle-in-cell simulation results, which also indicate that the SB FWO exhibits a better outstanding performance (84.6 W with a beam voltage and current of 25.1 kV and 200 mA, respectively) than the conventional circular beam FWO. The transmission stability of the SB was analyzed by observing the interception beam current in the FWO. The voltage and frequency tuning performance of the SB FWO were discussed in combination with clutter suppression. A preliminary experiment was conducted by fabricating a 220 GHz SB FWG-SWS and measuring the S parameter.

中文翻译：

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薄电子束太赫兹折叠波导振荡器的研究

毫米波至太赫兹制的高功率真空电子设备由于其在科学和技术中的潜在应用而引起了广泛的关注。在本文中，一种新颖的片状梁（SB）折叠波导（FWG）慢波结构（SWS）被应用并进行了研究，以提高振荡器的输出功率。通过分析SB FWG-SWS的高频特性，可以确定在2π阻带点附近工作的SB折叠波导振荡器（FWO）在色散曲线和光束位置上选择合适的束波相互作用点。SB FWO的基本模式操作已通过粒子内仿真结果验证，这也表明SB FWO表现出更好的出色性能（84.6 W，束电压和电流为25.1 kV和200 mA，分别）。通过观察FWO中的拦截光束电流来分析SB的传输稳定性。结合杂波抑制讨论了SB FWO的电压和频率调谐性能。通过制造220 GHz SB FWG-SWS并测量S参数进行了初步实验。