衰减材料对高增益相对论速调管自激振荡的抑制  

Suppression of self-oscillation in high gain relativistic klystron amplifier by RF lossy material

作　　者：吴洋[1,2] 李正红[1] 谢鸿全[3] 成会[1] 

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]高功率微波技术重点实验室,四川绵阳621900 [3]西南科技大学理学院,四川绵阳621010

出　　处：《强激光与粒子束》2014年第6期199-203,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61271109)

摘　　要：在高增益相对论速调管放大器中,自激振荡严重影响器件的正常工作并导致脉冲缩短。通过粒子模拟研究了高次模式自激振荡的激励机制,并提出在器件内加入微波衰减材料来抑制该类自激振荡。详细研究了衰减材料的电导率和几何参数与高次模式衰减常数的关系,并开展了微波衰减体的冷测实验。冷测表明微波衰减体对高次模式的衰减达11.25 dB,其性能满足器件实验要求,可以用于高增益相对论速调管的热腔实验。In the high gain relativistic klystron amplifier,higher mode self-oscillation seriously degrades klystron performancc and causes pulse shortening.The mechanism of higher mode excitation is cxplorcd in the PIC simulation,and RF lossy material is introduced to suppress higher mode self oscillation.The relations of the attenuation characteristics with thickness,electric conductivity and length of the lossy material are studied.The cold test of the lossy material is performed.The attenuation of the lossy material is about 11.25 dB which fulfills the requirement of the suppression of self-oscillation,and can be used in the high gain relativistic klystron amplifier.

关 键 词：相对论速调管放大器 高增益 自激振荡 微波衰减材料 

分 类 号：TN62[电子电信—电路与系统]