28 GHz低速度离散回旋管电子枪三维电磁设计  

3D Electromagnetic Design of a 28GHz Gyrotron Electron Gun with Low Velocity Spread

作　　者：张江华 曾旭[2] ZHANG Jiang-hua;ZENG Xu(National Innovation Institute of Defense Technology,Academy of Military Sciences PLA,Beijing100071,China;National Key Laboratory of Science and Technology on Vacuum Electronics,Beijing Vacuum Electronics Research Institute,Beijing100015,China)

机构地区：[1]军事科学院国防科技创新研究院,北京100071 [2]北京真空电子技术研究所微波电真空器件技术国家级重点实验室,北京100015

出　　处：《真空电子技术》2022年第4期43-46,66,共5页Vacuum Electronics

基　　金：国家自然科学基金资助项目(11805276)。

摘　　要：磁控注入电子枪可以产生具有角向旋转速度分量的电子束,是回旋管的核心部件之一,其性能优劣直接决定了整管的系统性能。本文首先分析了两种典型的磁控注入电子枪结构,根据28GHz回旋管互作用腔束-波互作用工作需求,设计了一种双阳极结构的电子枪。三维粒子仿真设计结果表明,在阴极电压40kV、调制阳极电压18.2kV、电流3.2A的条件下,引导中心半径为3.2mm,横纵速度比为1.5,横向速度离散达到了1.06%。与此同时,所设计的电子枪具有较大的工作区间,在横纵速度比为1.9时,横纵速度比离散依旧能够达到不高于5%的要求。Magnetron injection gun(MIG)can produce electron beam with angular velocity compo-nent.As one of the core components of gyrotron,it can directly determine the whole system performance.Two typical magnetron injection gun structures are analyzed.According to the beam-wave interaction re-quirements of a 28GHz gyrotron,an electron gun with double anode structure is designed.The three-di-mensional(3D)particle simulation results show that under the condition of 40kV cathode voltage,18.2 kV modulated anode voltage and 3.2Abeam current,the radius of the beam guide center is 3.2mm,the transverse-to-axial velocity ratio is 1.5,and the perpendicular velocity spread at the cavity center is only 1.06%.At the same time,the MIG has a large working range.When the transverse-to-axial velocity ratio is 1.9,the standard deviation of it is controlled below 5%.

关 键 词：磁控注入电子枪 回旋管 28GHz 三维 

分 类 号：TN124[电子电信—物理电子学]