强激光与粒子束, 2010, 22 (5): 1077, 网络出版: 2010-09-15  

内导体半径对同轴相对论返波振荡器工作频率的影响

Influence of inner-conductor radius on operation frequency of coaxial relativistic backward wave oscillator
作者单位
国防科学技术大学光电科学与工程学院, 长沙 410073
摘要
利用电磁软件Superfish求解了同轴慢波结构中准TEM模对应的π模的电场矢量分布, 分析了内导体半径对谐振频率的影响。采用Karat 2.5维全电磁粒子模拟程序设计了一个L波段相对论返波振荡器, 研究了内导体半径参数改变对器件工作频率的影响。通过使用半径为0.50, 0.75, 1.00 cm的内导体, 实验测得微波中心频率分别为1.64, 1.63, 1.61 GHz, 变化趋势与理论分析结果一致。实验测得频率比粒子模拟结果仅高0.01 GHz, 两者吻合较好。
Abstract
The dispersion curves of the coaxial slow-wave structure(SWS) with the trapezoidal corrugation are obtained by numerical calculation. The electric field vector of π mode of the quasi-TEM mode and the influence of the inner-conductor radius on resonance frequency are calculated using the electromagnetic software Superfish. In addition, a compact L-band relativistic backward wave oscillator(RBWO) is investigated and optimized in detail with particle-in-cell(PIC) methods(Karat code) to explain effects of the inner-conductor radius. In experiment, the operation frequencies are 1.64 GHz, 1.63 GHz and 1.61 GHz when the inner-conductor radii are 0.50 cm, 0.75 cm and 1.00 cm respectiuely, which shows that the operation frequency decreases with the enlargement of the inner-conductor radius. To sum up, the experimental results are in good agreement with the results of the theoretical analysis.

葛行军, 钟辉煌, 钱宝良, 张军, 杨一明, 汪伟. 内导体半径对同轴相对论返波振荡器工作频率的影响[J]. 强激光与粒子束, 2010, 22(5): 1077. Ge Xingjun, Zhong Huihuang, Qian Baoliang, Zhang Jun, Yang Yiming, Wang Wei. Influence of inner-conductor radius on operation frequency of coaxial relativistic backward wave oscillator[J]. High Power Laser and Particle Beams, 2010, 22(5): 1077.

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