高Q值单间隙同轴谐振腔的物理设计与实验研究  

Design and measurement of high Q-factor coaxial resonant cavity

作　　者：吕彦奎 阳福香 党方超 葛行军 贺军涛 LüYankui;Yang Fuxiang;Dang Fangchao;Ge Xingjun;He Juntao(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,长沙410073

出　　处：《强激光与粒子束》2024年第3期72-76,共5页High Power Laser and Particle Beams

摘　　要：随着高功率微波源向高功率、高频率和长脉冲方向不断发展,同轴相对论速调管放大器(RKA)成为近年来研究热点之一,然而其发展一直受限于自激振荡等问题存在,为此,设计一种高Q值单间隙同轴谐振腔,以抑制同轴RKA中TEM模式泄露引起的自激振荡。通过对单间隙同轴谐振腔TM_(01)模式与TEM模式转化进行理论分析与仿真模拟,发现同轴谐振腔上下槽深差值与轴向错位值对其Q值变化影响很大,当上下槽深差值与轴向错位值分别为0.3 mm和0 mm时,同轴谐振腔的Q值为极大值(18764),意味着此时谐振腔中两种模式转化最小,多组谐振腔级联后自激振荡风险大大降低。将三组级联的高Q值单间隙同轴谐振腔应用于紧凑型同轴RKA,粒子模拟和实验结果表明,器件的输出微波功率稳定,频谱纯净,无自激振荡等问题存在。With the development of high power microwave sources towards high power,high frequency and long pulse,coaxial relativistic klystron amplifiers(RKA)have become one of the research hotspots in recent years.However,its development is limited by self-excited oscillation,etc.Therefore,a high Q-factor single-gap coaxial resonator is designed in this paper to suppress the self-oscillation caused by TEM mode leakage of the coaxial RKA.Through the theoretical analysis and simulation of TM_(01)mode and TEM mode conversion in a single-gap coaxial resonator,it is found that the depth difference and axial dislocated values of the upper and lower slots of the coaxial resonator have a great influence on the change of its Q factors.When the depth difference and axial dislocation value of the upper and lower slots are 0.3 mm and 0 mm respectively,the Q factor of the coaxial resonator has the maximum value(18764).This means that the conversion between the two modes in the resonator is minimal,greatly reducing the risk of self-oscillation between several cascaded coaxial resonators.When three cascaded high-Q-factor single-gap coaxial resonators are applied to the compact coaxial RKA,the output microwave power of the device is stable,the spectrum is pure,and there are no self-excited oscillations in the simulation and experiments.

关 键 词：同轴相对论速调管放大器 自激振荡 高Q值 单间隙同轴谐振腔 

分 类 号：TN62[电子电信—电路与系统]