为了增加回旋管的功率, 采用双注磁控注入电子枪产生相对论电子注。与双阳极磁控注入电子枪相比, 双注磁控注入电子枪产生双束电子注, 在不影响电子注质量的基础上, 增加电子枪的电流; 电子枪产生相同电流时, 双注磁控注入电子枪电子注电流小, 电子注电子之间的空间电荷效应小, 能够降低电子注的速度零散, 提高电子注的质量。采用MAGIC软件数值模拟双注磁控注入电子枪, 设计出一支大束流、低速度零散的双注磁控注入电子枪。

A double-beam magnetron injection gun was used to improve the output power of gyrotrons. A double-beam magnetron injection gun can output two relativistic electron beams, which is a better way to raise the current of the magnetron injection gun without reducing the quality of electron beams. Compared with the double-anode magnetron injection gun with the same output current, the double-beam magnetron injection gun can reduce velocity spread and improve the quality of electron beams, because of its smaller influence of the space charge. Using the software MAGIC, a double-beam magnetron injection gun with a modest velocity ratio and a low velocity spread of electron beams was designed.