国防科技大学 前沿交叉学科学院，高功率微波技术研究所，长沙 410073
为实现模块化相对论速调管放大器功率、频率和相位的在线测量，对紧凑型高定向性高带宽的定向耦合器进行了仿真和实验研究。利用小孔耦合理论和相位叠加原理进行理论分析，设计了一种双孔紧凑型定向耦合器，在此基础上采用主、副波导正交连接，耦合孔沿轴向和角向二维分布的方法，进一步缩短了耦合器的长度。通过电磁仿真对耦合器各参数进行优化，模拟结果表明：当中心频率为10 GHz时，普通双孔定向耦合器对TM01模式的耦合度为−60.68 dB，在250 MHz的带宽内定向性大于20 dB，此时耦合区长度为3.49 cm。改进型定向耦合器对TM01模式的耦合度为−58.1 dB，在300 MHz的带宽内定向性大于20 dB，此时耦合区长度仅为1.8 cm（约0.6λ）。耦合器的冷腔实验测量结果与仿真结果符合较好。
高功率微波 相对论速调管放大器 定向耦合器 X波段 high power microwave triaxial klystron amplifier directional coupler X-band 强激光与粒子束
2023, 35(5): 053004
强激光与粒子束
2020, 32(10): 103001
Author Affiliations
Abstract
Laboratory of High Power Microwave Technology, National University of Defense Technology, Changsha, People's Republic of China 410073
Research progresses on Cherenkov and transit-time high-power microwave (HPM) sources in National University of Defense Technology (NUDT) of China are presented. The research issues are focused on the following aspects. The pulse-shortening phenomenon in O-type Cerenkov HPM devices is suppressed. The compact coaxial relativistic backward-wave oscillators (RBWOs) at low bands are developed. The power efficiency in M-Type HPM tubes without guiding magnetic field increased. The power capacities and power efficiencies in the triaxial klystron amplifier (TKA) and relativistic transit-time oscillator (TTO) at higher frequencies increased. In experiments, some exciting results were obtained. The X-band source generated 2 GW microwave power with a pulse duration of 110 ns in 30 Hz repetition mode. Both L- and P-band compact RBWOs generated over 2 GW microwave power with a power efficiency of over 30%. There is approximately a 75% decline of the volume compared with that of conventional RBWO under the same power capacity conditions. A 1.755 GHz MILO produced 3.1 GW microwave power with power efficiency of 10.4%. A 9.37 GHz TKA produced the 240 MW microwave power with the gain of 34 dB. A 14.3 GHz TTO produced 1 GW microwave power with power efficiency of 20%.
High-power microwave (HPM) Long-pulse O-type Cerenkov source Magnetically insulated line oscillator (MILO) Coaxial relativistic backwardwave oscillator (RBWO Triaxial klystron amplifier (TKA) Transit-time oscillator (TTO) Matter and Radiation at Extremes
2016, 1(3): 2016
国防科学技术大学 光电科学与工程学院, 高功率微波技术研究所, 长沙 410073
为满足X波段三轴速调管放大器（TKA）各腔内部自激振荡的诊断需求,设计了一种结构单紧凑、无需外部密封结构的新型波导耦合器。利用小孔耦合原理和CST仿真软件,针对TKA中常见的自激振荡TE61模式,对该耦合器的耦合特性进行了理论分析和仿真设计。结合PIC方法,建立了利用该耦合器诊断TKA同轴漂移管内传输微波频谱特性的物理模型。通过仿真计算,验证了所设计的耦合器用于TKA自激振荡诊断的有效性。
三轴速调管放大器 漂移管 自激振荡 波导耦合器 电磁场诊断 triaxial klystron amplifier drift tube asymmetric mode competition waveguide coupler diagnosis of electromagnetic field 强激光与粒子束
2015, 27(11): 113001
