0.5 THz双电子注返波管注波互作用的高频结构优化

Structure optimization and beam wave interaction of 0.5 THz rectangular grating BWO with double beams

摘要:

返波振荡器是一种重要的真空电子学太赫兹源，具有高功率、高工作频率和宽带调谐等特点。为提高圆形电子注与光栅慢波结构的互作用，提出一种双电子注嵌入矩形光栅的慢波结构，使电子注与光栅表面电场更好地充分相互作用，从而提高互作用效率和输出功率。通过数值求解和仿真计算其色散特性，结果表明，相比于相同结构参数的普通矩形单栅，该结构可以实现更高的工作频率和耦合阻抗。利用CST进行PIC仿真，优化结构和电子注参数，最终得到工作频率501 GHz,10.6 W的稳定输出。研究成果为设计0.5 THz的返波管提供了理论指导。

Abstract:

Backward Wave Oscillator(BWO) is one of the most attractive terahertz sources belong to the vacuum electron devices, which has superior performances in power capacity, high frequency, and bandwidth. For the purpose of improving the interaction between the circular electron beam and the grating slow-wave structure in BWO, a novel slow-wave structure with double electron beams embedded in the rectangular grating is proposed. The dispersion characteristics of such structure are verified by numerical calculation and simulation part, and the results show that it can achieve higher operating frequency and coupling impedance compared with a common rectangular single grating with the same structural parameters. Moreover, PIC simulations are carried out to optimize its structure, and a stable output 10.6 W with 501 GHz frequency is obtained. This research would provide guidance for the design of 0.5 THz BWO.