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We study a two-stream backward-wave oscillator with a slot-hole structure at short millimeter waves with the help of a three-dimensional particle-in-cell simulation. In order to increase the interaction region of the electron beam, the efficiency and the output power, a slot-hole loaded rectangular waveguide structure used as the high-frequency system is proposed. Based on the mechanism of the backward-wave oscillator, a slow-wave oscillator with a frequency of 0.14 THz is designed. The simulations show that the output power and the efficiency of the oscillator can be enhanced due to the coupling between the two beams through the slot holes. The interaction efficiency is 5.18%, and the starting current density is below 5 A·cm-2 for the two beams. These attractive results indicate that, based on the two-stream backward-wave oscillator, we can get short millimeter wave sources with high power and low current density. 相似文献
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基于Smith-Purcell(SP)效应,采用粒子模拟的方法探讨了电子束团激发一维介质光子晶体中的SP辐射特性.模拟研究了单个束团激发一维介质圆柱光子晶体产生的SP辐射现象,并对周期束团激发的THz频段的相干SP辐射进行了模拟分析.研究表明,提高介质的相对介电常数和增加光子晶体的层数都可使辐射强度增加,选择合适的参数能够有效地增强THz频段的相干SP辐射强度. 相似文献
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