Can focus sunlight in the focal plane, the formation area of different sizes and brightness of different focal spot.
可以把太阳光聚焦在焦面内，形成面枳大小不同和亮度不同的焦斑。
The upper limit values of blurred area coverage of focal spot caused by the fluctuation of accelerating gap voltage are also calculated using a approximate method.
同时通过近似计算给出了由于加速间隙电压波动引起束聚焦焦斑模糊范围增大的上限值。
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