通过对磁聚焦系统进行优化设计，外层电子注轨迹得到明显改善。
Optimization of the magnetic focusing system can decrease the radial magnetic induction and improve the electron beam quality.
通过对磁聚焦系统进行优化设计，外层电子注轨迹得到明显改善。
Optimization of the magnetic focusing system can decrease the radial magnetic induction and improve the electron beam quality.
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