The beam then arcs circumferential ly back to a negatively charged high energy flux aperture.

然后光束沿着四周成弧状折回一个充满负电的主能量通行孔径。

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The beam then arcs circumferentially back to a negatively charged high energy flux aperture.

然后能量束转回带负电荷的高能流动孔。

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It is hard to design for beam expander with high power and wide aperture required, because it is shorten length, larger aperture, as well as on axis and off axis aberration must be corrected properly.

高倍率及大孔径扩束器要求筒长短、口径大、轴上和轴外的像差都要很好地校正，所以光学系统的设计是非常困难的。

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