bunching space
... bunching angle 聚束角 bunching space 群聚空间 bunching voltage 聚群电压 ...
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并且分析了空间电荷波对电子束群聚的影响：在小信号时使群聚减小；在大信号时使群聚增强。
The role of the space charge wave is that it makes bunching reduce at small signal, but it makes bunching enhance at large signal.
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