,Three-dimensional simulation of a Ka-band relativistic Cherenkov source with metal photonic-band-ga

• 作 者: Gao Xi Yang Zi-Qiang Qi Li-Mei Lan Feng Shi Zong-Jun Li Da-Zhi Liang Zheng
• 机 构: Research Institute of High Energy Electronics, University of Electronic Science and Technology of Ch
• 出 处: 中国物理B（英文版）
• 发表日期: 2009年6期
• 关键词: Cherenkov source slow wave structure photonic band gap three-dimensional particl

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 TM01-1ike 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.