带状注速调管高频结构的初步研究

 利用3维软件设计并模拟了适用于X波段高功率带状注速调管的“Ⅱ”形谐振腔，根据模拟结果分析了腔体各尺寸对电场均匀性的影响；建立了平面对称结构的3维高频互作用系统模拟平台，应用此平台讨论了扼流器法和漂移管窄壁开槽法这两种抑制漂移管中非工作模式的方法；分析了漂移管的尺寸及漂移头对谐振腔内场分布的影响。研究表明：波导高度、耦合腔宽度和高度对带状注速调管谐振腔间隙的电场均匀性影响较大；而波导长度和宽度、耦合腔长度对该电场均匀性影响不大；腔体连接处加上漂移头可使场分布更加集中；该型带状注速调管谐振腔能够产生均匀的电场，为提高注波互作用效率奠定了基础。

Preliminary research on RF structure of sheet beam klystron

The sheet beam klystron is a new kind of microwave vacuum device,which uses a high aspect ratio,thin rectangular beam to reduce space charge effects,increase power capability and beam-wave interaction efficiency.In this paper,an X-band SBK cavity was designed.The fundamental mode had an almost ideally flat field.3D simulation platforms of beam-wave interaction system with plane symmetry were established to suppress the modes propagating in the drift spaces,and choke cavities and slotting the drift tube was also discussed.The results indicate that the barbell-shaped cavity could meet the need of sheet beam klystron.The cavity sizes,the height of waveguide,the width and the height of coupling cavity are sensitive to the field flatness and the drift tube noses significantly improve the electric field distribution along z-axied.