多注集成带状注微波管电子光学传输特性研究

Simulation of Influence of Magnetic Fields on Electron Optical Transmission of Multi Sheet-Beam Integrated Microwave Tubes

带状注在高频率、高功率、大电流密度等方面具有很好的前景,且其平面形的结构对于多注集成来说极具优势。为此该文选取了相对便于多注集成的均匀磁场、Wiggler磁场和周期会切(PCM)磁场,使用微波管模拟器套装的电子光学模拟器对带状电子注的传输特性进行了研究。结果表明:均匀磁场下带状注可以稳定传输最远;随着带状电子注电流密度的增大,相对不易获取的磁场结构依次是PCM磁场(最难获得)、Wiggler磁场和均匀磁场;Wiggler磁场相对而言,是比较便于工程应用,并保证电流密度较大带状电子注可以稳定传输的最好选择。给出了Wiggler磁场3×3多注集成的模拟结果,其电流密度为110 A/cm2,该Wiggler磁场结构的凹槽可以使带状电子注在传输过程中具有一定的聚束效果,对于约束互作用后的电子注将有良好的效果。

The electron optical transmission characteristics of the multi sheet-beam integrated microwave tubes. The influence of the uniform, Wiggler, and periodically cusped magnetic （PCM） fields on the electron transport of the sheet- beam was modeled and simulated with software, the electron optic simulator of the microwave tube simulator suite. The simulate results show that the magnetic field distribution strongly affects the electron transport. For example, the uniform magnetic field results in the longest stable transmission; as the sheet-beam current density, increases, the generation diffi- culties of PCM, Wiggler, and uniform magnetic fields follows a descending order. When it comes to engineering applica- tions, Wiggler magnetic field is the best choice because it is less difficult to be generated and it is capable of stably trans- mitting high density sheet-beam. The current density was 110 A/cm2 in simulatian of the 3×3 multi sheet-beam in Wig- gler magnetic field. Besides, the center notched structure focuses the sheet-beam in the transmission, confining the beam after beam wave interaction.