电子束激励TM模虚阴极振荡器的分析

Analysis on the TM modes of axial vircator driven by electron beam

从理论上对实心电子束和空心电子束激励轴向虚阴极振荡器产生高功率微波的情况进行了比较分析。通过数值计算比较了在相同的结构参数条件下输出微波功率的大小。分别讨论了在激励TM01和高阶TM02,TM03模式时电子束半径的优化值。用KARAT软件进行粒子模拟初步验证了数值计算的结果。数值计算和粒子模拟结果均表明:要在轴向虚阴极振荡器中有效地激励TM01主模式,应采用实心电子束;而空心电子束则在激励高阶TM0n模式时,可能更为有效。

Axial vircators driven by hollow electron beam and solid electron beam, respectively, are compared with each other and analyzed theoretically. The output power of microwave under the same structural parameters was numerically calculated for comparison. Further analysis on the radius of electron beams for the TM01, the TM02 and the TM03 modes was also carried out. PIC simulations using KARAT are accordant with the calculation. Results show that the power of TM01 mode driven by the solid electron beam is higher than the case of hollow electron beam, but in the case of the higher order TM0n modes, the hollow electron beam is probably better for the power generation of microwaves.