摘要
设计和实验了一台可用于会聚几十keV强流离子束的空间电荷透镜.实验结果可用简化的物理模型来解释.实验验证了空间电荷场的存在及其强聚焦特性.指出在这一实验条件下空间电荷场形成的弛豫时间比10μs小得多,因而可以用来会聚脉宽为几百μs量级或更长的脉冲束.
A space charge lens has been designed and tested which can be used to focus intense ion beams at several tens of keV. The experimental: results obtained can be interpreted with a simplified physical model. The existence of a space charge field and its strong focusing properties are tested experimentally. And it is shown that the relaxation time for the formation of space charge field is much less than 10μs under our experimental conditions, thus the lens can be used to focus pulsed beams with length of several hundreds of μs or longer.
