Three-dimensional simulation of a Ka-band relativistic Cherenkov source with metal photonic-band-gap structures
Three-dimensional simulation of a Ka-band relativistic Cherenkov source with metal photonic-band-gap structures
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DOI：
10.1088/1674-1056/18/6/055
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发表时间：
2009-06
影响因子：
1.7
通讯作者：
Gao Xi;Yang Ziqiang;Qi Li-mei;Lan Feng;Shi Zongjun;Li Da-Zhi;Liang Zheng
中科院分区：
文献类型：
--
作者：
Gao Xi;Yang Ziqiang;Qi Li-mei;Lan Feng;Shi Zongjun;Li Da-Zhi;Liang Zheng
本文提出了 Ka 波段相对论切伦科夫源的三维粒子在单元 (PIC) 模拟，该源具有由金属光子带隙 (PBG) 结构组成的慢波结构 (SWS)。在模拟中，采用完美匹配层边界来吸收由具有人造金属边界的PBG晶格支持的通带模式。 SWS 横截面和表面的模拟轴向场分布表明该器件在类 TM01 模式的 π 点附近工作。轴向场作为时间和空间函数的傅里叶变换谱表明，在36.27 GHz处仅出现一个频率，这与色散曲线与梁上产生的慢空间电荷波的交点非常吻合。仿真结果表明SWS具有良好的模式选择性。
This paper presents a three-dimensional particle-in-cell (PIC) simulation of a Ka-band relativistic Cherenkov source with a slow wave structure (SWS) consisting of metal photonic band gap (PBG) structures. In the simulation, a perfect match layer boundary is employed to absorb passing band modes supported by the PBG lattice with an artificial metal boundary. The simulated axial field distributions in the cross section and surface of the SWS demonstrate that the device operates in the vicinity of the π point of a TM01-like mode. The Fourier transformation spectra of the axial fields as functions of time and space show that only a single frequency appears at 36.27 GHz, which is in good agreement with that of the intersection of the dispersion curve with the slow space charge wave generated on the beam. The simulation results demonstrate that the SWS has good mode selectivity.