强激光与粒子束2025，Vol.37Issue(7)：28-33,6.DOI:10.11884/HPLPB202537.250042
相对论强流电子束驱动的X波段同轴回旋管腔体设计
Design of X-band coaxial gyrotron cavity driven by intense relativistic electron beam
摘要
Abstract
Under the driving of explosive-emission cathodes,relativistic gyrotrons frequently suffer from virtual cathode phenomena induced by ultrahigh beam currents(＞300 A),where electron beams readily impact the inner conductor surfaces,accompanied by unintended excitations of cyclotron resonance and backward-wave oscillation(BWO)modes.This study systematically investigates the electromagnetic characteristics of an X-band coaxial gyrotron cavity driven by an intense relativistic electron beam(IREB),combining theoretical analysis with three-dimensional particle-in-cell(PIC)simulations.The results demonstrate that stable IREB transmission and TE01 single-mode operation can be achieved through cavity geometry optimization and electron beam parameter matching.The cavity quality factor(Qcav)plays a critical role in suppressing parasitic mode competition:TE21-BWO modes are excited when Qcav＜65,while TE31 cyclotron resonance modes emerge when Qcav＞90.Stable TE01 single-mode oscillation with an output power of 35 MW(voltage:300 kV,current:500 A,transverse-to-longitudinal velocity ratio:1.2)and efficiency of 34.4%are maintained within the Qcav range of 65-90.Further studies reveal that the cavity exhibits significant robustness against electron beam velocity spread(Δβ＜25%),providing critical insights for high-power microwave source design.关键词
相对论回旋管/强流相对论电子束/模式竞争/三维粒子模拟Key words
relativistic gyrotron/intense relativistic electron beam/mode competition/3D-particle-in-cell simulation分类
信息技术与安全科学引用本文复制引用
安晨翔,周宁,陈坤,王登攀,李冲,桂猷猷,杨以航,崔新红,史彦超..相对论强流电子束驱动的X波段同轴回旋管腔体设计[J].强激光与粒子束,2025,37(7):28-33,6.基金项目
国家自然科学基金项目(12175182) （12175182）
