强激光与粒子束2025，Vol.37Issue(9)：27-32,6.DOI:10.11884/HPLPB202537.250041
220GHz共焦波导回旋行波管放大器衍射损耗率分析
Analysis of reasonable diffraction loss rate in 220 GHz confocal waveguide gyro-TWT amplifier
摘要
Abstract
[Background]The confocal waveguide structure can effectively suppress mode competition due to its characteristic of reducing mode density through diffraction loss,thereby facilitating stable operation of gyro-traveling-wave-tube(gyro-TWT)amplifiers in the terahertz(more than 100 GHz)frequency range.[Purpose]This study aims to conduct a comprehensive analysis of the diffraction loss rate(DLR)in a 220 GHz confocal waveguide gyro-TWT,employing a combination of theoretical analysis and three-dimensional particle-in-cell(3D-PIC)simulations.[Methods]The research integrates field distribution theory with 3D-PIC simulations to investigate the DLR of the confocal waveguide.A non-ideal waveguide model incorporating the mirror width angle was utilized,and simulations were performed to evaluate beam-wave interaction dynamics under varying DLR conditions.[Results]The study reveals that a low DLR induces gyro-backward-wave oscillation(GBWO)in low-order competing modes,while a high DLR significantly reduces beam-wave interaction efficiency,gain,and bandwidth,and lowers tolerance to electron beam velocity spread.[Conclusions]For stable single-mode operation of the HE07 mode in the designed gyro-TWT,the DLR should not be less than 0.38 dB/cm,with the corresponding mirror-surface width angle not exceeding 47°.These findings provide crucial design guidelines for terahertz gyro-TWTs.关键词
共焦波导/衍射损耗率/太赫兹源/回旋行波管Key words
confocal waveguide/diffraction loss rate/terahertz generation/gyro-TWT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,王俊清,史彦超..220GHz共焦波导回旋行波管放大器衍射损耗率分析[J].强激光与粒子束,2025,37(9):27-32,6.基金项目
国家自然科学基金项目(12175182) （12175182）
