A magnetron-injection gun able to provide very high ratio t_j≈ 0.5 of the beam current to the Langmuir current has been designed, while maintaining good enough quality and stability of a formed helical electron beam. The specific feature of the gun is the shape of the cathode with two singular points of the electric field distribution which ensure close to uniform electric field profile within the emitter ring for wide range of operating currents. The gun provides the smoothed dependence of the beam parameters for currents up to 1.5–2 A and is suitable for wide (~ 10 GHz) frequency range gyrotron operation with the central frequency of 0.2 THz and output power ~ 1 kW within the whole tuning band. Such approach for the magnetron-injection gun design can be used for development of other promising high power sub-THz gyrotrons.

能够提供很高比率t _j的磁控注入枪在保持形成的螺旋电子束的足够好的质量和稳定性的同时，设计了相对于Langmuir电流约0.5％的束流。喷枪的特定特征是阴极的形状，具有两个电场分布的奇异点，可确保在宽范围的工作电流下，在发射环内接近均匀的电场分布。该喷枪可对电流高达1.5–2 A的光束参数提供平滑的依赖性，适用于宽频率（〜10 GHz）的回旋加速器操作，其中心频率为0.2 THz，在整个调谐频带内的输出功率均为〜1 kW 。磁控管注入枪设计的这种方法可用于开发其他有前途的高功率亚太赫兹回旋管。