Three-dimensional simulation of a Ka-band relativistic Cherenkov source with metal photonic-band-gap structures  

作　　者：高喜 杨梓强 亓丽梅 兰峰 史宗君 李大治 梁正 

机构地区：[1]Research Institute of High Energy Electronics,University of Electronic Science and Technology of China [2]Institute for Laser Technology

出　　处：《Chinese Physics B》2009年第6期2452-2458,共7页中国物理B（英文版）

基　　金：Project supported by the National Key Basic Research Program of China (Grant No 2007CB31040);the National Natural Science Foundation of China (Grant No 60571020)

摘　　要：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.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.

关 键 词：Cherenkov source slow wave structure photonic band gap three-dimensional particlein-cell 

分 类 号：TN103[电子电信—物理电子学]