Simulation of a G-band sheet beam backward wave oscillator with double staggered metallic rod array
Simulation of a G-band sheet beam backward wave oscillator with double staggered metallic rod array
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DOI：
10.1088/0022-3727/46/34/345102
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
Guo Liu;Wenlong He;A. Cross;H. Yin;D. Bowes
中科院分区：
文献类型：
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作者：
Guo Liu;Wenlong He;A. Cross;H. Yin;D. Bowes
返波振荡器（BWO）是一种很有前途的太赫兹波段高功率便携式辐射源。设计并实现了一种G波段（140-220 GHz）基于双交错金属棒阵列慢波结构的片状波束返波管。如果棒阵列的高度选择适当，这种新型慢波结构可以扩大与均匀电场的相互作用区域。这可以减轻在片状束传输和潜在的寄生振荡中的束不稳定性问题。此外，由于其特殊的色散特性，可以实现相对较宽的带宽。粒子模拟结果表明，采用改进的非均匀双交错金属棒阵列结构的G波段片注返波管在186.3- 227.2GHz的连续频率调谐范围内，输出功率可达110 W以上（相对带宽20%），最大电子效率为2.8%。
Backward wave oscillators (BWO) are promising high-power portable radiation sources in the terahertz frequency range. A G-band (140–220 GHz) sheet beam BWO based on a double staggered metallic rod array as the slow wave structure (SWS) has been designed and presented in this paper. The novel SWS allowed extension of the interaction area for the sheet beam with a uniform electric field if the height of the rod array is properly chosen. This could alleviate beam instability problems in the sheet beam transportation and potential parasitic oscillations. Moreover, a relatively broad bandwidth can be achieved due to its special dispersive properties. Particle-in-cell simulation had predicted that the G-band sheet beam BWO with the improved non-uniform double staggered metallic rod array can achieve output power of over 110 W in a continuous frequency tuning range of 186.3–227.2 GHz (relative bandwidth 20%) with a maximum electronic efficiency of 2.8% by using a 200 mA sheet beam and adjusting the beam voltage from 20 to 40 kV.