基于低磁场返波管振荡器的工作原理,设计了一个捷变频相对论返波管振荡器,该器件由两段对电子束参数要求基本一致的慢波结构串接而成,通过调节引导磁场强度实现器件频率的调节,使其分别工作于C波段和X波段。在电子能量和束流分别为670keV和8kA的条件下,当引导磁场强度为0.5T时,采用2.5维PIC程序模拟得到频率为6.28GHz、功率为1.0GW 的微波输出;而当引导磁场强度为0.8T时,得到频率为9.25GHz、功率为0.75GW 的微波输出。

Based on the working principle of the backward wave oscillator(BWO)with a low magnetic field, a frequency-agile relativistic backward wave oscillator(RBWO), whose frequency can be counterchanged between X band and C band by changing the strength of the guiding magnetic field, is designed. To actualize frequency’s agile counterchange, two sections of slow wave structure(SWS), whose appeals on parameters of electron beams are accordant, are linked. When the energy of the electron is 670 keV while the beam current is 8 kA, the simulated result of 1.0 GW output microwave power with 6.28 GHz frequency is obtained on conduction of 0.5 T guiding magnetic field, while 0.75 GW output microwave power with 9.26 GHz frequency is obtained on conduction of 0.8 T guiding magnetic field.