在前几年里对于较高平均功率微波管的兴趣在不断增长。平均功率电平约在5到10千瓦(在x波段),由于截获电子而引起的线路发热问题,在行波管中甚至聚焦良好的实心电子注也变得难于使用了。因此超过上述的功率电平,我们必须考虑使用多电子注电子枪,或者是更好一点考虑用大的空心注电子枪。尽管对大功率亦即对空心注的兴趣增长了,然而对于产生大密度空心注电子枪的设计方法方面进 Interest in microwave tubes of higher average power in previous years has been growing. Average power levels are around 5 to 10 kilowatts (in the x-band), and even solid-focused electronic shots in traveling-wave tubes become difficult to use due to the problem of line heating due to intercepted electrons. Therefore, beyond the above power level, we must consider the use of a multi-electron electron gun or, better yet, consider a large hollow gun. Despite the growing interest in high power, ie, hollow shots, the design approach to creating large hollow shot guns