The existence of a space charge field and its strong focusing properties are tested experimentally.
实验验证了空间电荷场的存在及其强聚焦特性。
The space charge field has the essence distinction in the vacuum and the electric channel with plasma-background.
研究发现电子通道填充背景等离子体，其空间电荷场与真空中的有本质差别。
We aslo study the effect of the applied field on recording of the first three higher order harmonics of the space charge field.
当扩散场与外加电场可比拟时，外加电场对空间电荷场的影响不大；
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