【摘要】 G波段超构表面行波管具有天然的双电子注通道，电子注可以在超构表面两侧传输，和超构表面的局域增强电场进行注波互作用，可提高G波段行波管的输出功率和效率。本文研究了一支适用于G波段超构表面行波管的多注电子枪，其采用八个相同的圆形阴极构成双排阵列，以产生双排多电子注，同时设计了一种三级聚焦极，使双排多电子注聚焦并与电子注通道适配。模拟结果表明，当注电压为24.6 kV、阴极半径为0.15 mm时，总注电流达到173 mA,阴极发射电流密度为30.6 A/cm~2,射程为13 mm。静态流通模拟结果表明，在0.2 T的均匀磁场聚焦下，电子注在超构表面慢波结构中可以传输70 mm。该研究为G波段超构表面行波管的研究奠定理论基础。更多还原

【Abstract】 The G-band metasurface-based traveling-wave tube(TWT) is inherently equipped with a double electron beam channel, where electron beams can be transported on both sides of the metasurface, and can be interacted with the localized enhanced electric field of the metasurface to improve the output power and efficiency of the G-band TWT. In this paper, a multi-beam electron gun suitable for the G-band metasurface-based TWT is studied, which uses eight identical circular cathodes to form a dual-row array to produce a double-layer multiple electron beam. At the same time, a three-stage focus electrode is designed to form the double-layer multiple electron beam with suitable size for the electron beam channel. The multi-beam electron gun simulation results show that when the beam voltage and the cathode radius are 24.6 kV and 0.15 mm, respectively, the total beam current is 173 mA, the corresponding emission current density is 30.6 A/cm~2, and the distance between the cathode emitting surface and the beam waist position is 13 mm. The static beam transportation simulation results indicate that under a uniform magnetic field of 0.2 T, the electron beams can be stably transported in the metasurface-based slow-wave structure for 70 mm. This study lays the theoretical foundation for the research of G-band metasurface-based TWTs.更多还原