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首页> 外文期刊>Technical physics letters: Letters to the Russian journal of applied physics >Mode Selection in an S-Band Relativistic Backward Wave Oscillator Based on a Coaxial Waveguide
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Mode Selection in an S-Band Relativistic Backward Wave Oscillator Based on a Coaxial Waveguide

机译：基于同轴波导的S波段相对论倒波振荡器的模式选择

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摘要

The competition of oscillations in a relativistic backward wave oscillator (RBWO) based on a coaxial waveguide has been studied by theoretical and experimental methods. It is established that the starting current for asymmetric magnetic TEm1 type waves is lower than that for the TEM wave. Predominant excitation of the former waves is confirmed by numerical simulations using the PIC-code KARAT. In an experimental RBWO prototype, the excitation of asymmetric oscillations was suppressed by longitudinal cuts in the central conductor of the coaxial waveguide. As a result, stable generation of the TEM wave has been achieved at a frequency of 1.23 GHz, a peak power of 260 MW, and a 28% efficiency of electron-beam-power conversion into radiation power for a microwave-pulse duration of 33 ns.
机译：通过理论和实验方法研究了基于同轴波导的相对论后向波振荡器（RBWO）中的振荡竞争。可以确定的是，不对称磁性TEm1型波的启动电流低于TEM波的启动电流。通过使用PIC代码KARAT进行的数值模拟，确认了前者的主要激发。在一个实验性的RBWO原型中，同轴波导中心导体的纵向切口抑制了非对称振荡的激发。结果，在微波脉冲持续时间为33的情况下，在1.23 GHz的频率，260 MW的峰值功率和28％的电子束功率转换为辐射功率的效率方面，已经实现了TEM波的稳定生成。 ns。

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