针对0.14 THz行波管对于效率、尺寸等指标的提升需求,开展高性能多级降压收集极设计.为了实现收集极小型化,构建了合适的横向磁场,能够使剩余电子注轨迹向热沉方向偏转,有利于缩短轴向长度、抑制返流及提高散热效率.通过MTSS微波工作室软件开展多级降压收集极仿真优化,具体包括降压级数及降压值选取、横向磁场设计、电极结构优化,设计结果显示,收集极在140～160 GHz共20 GHz带宽内,收集极效率大于97.6％,返流率低于0.39％,收集极主要尺寸为外径24 mm,长度 27 mm.
Design of a High Performance Multistage Depressed Collector for 0.14 THz Traveling Wave Tubes
In order to meet the requirements of higher efficiency and smaller overall size for 0.14 THz trave-ling wave tubes,a multistage depressed collector(MDC)with an additional transverse magnetic field is investi-gated.By constructing and optimizing a suitable transverse magnetic field in collector region,the spent beam elec-trons are deflected towards heat sink side,which significantly shortens axial length,suppresses back-streaming and enhances heat dissipation.The MDC is simulated by using microwave tube simulation studio(MTSS)code,the process mainly includes the selection of depressed stages and electrode potentials,optimization of transverse magnetic field and design of electrode shape.The simulation results show that the collector efficiency is greater than 97.6％and the back-streaming rate is lower than 0.39％within 20 GHz bandwidth of 140～160 GHz.The outside diameter of the MDC is 24 mm and the length is 27 mm.
万方数据
