计算的正柱区伏-安特性与实验符合。

The calculation agrees with the experimental results.

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最后到达的区域是正柱区，这里，电子和离子具有相等的密度。

Finally the positive column is reached where electrons and ions have equal densities.

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结果表明，放电单元采用大电极间距可获得正柱区放电，正柱区的形成是正离子在阴极鞘层区不断积累将电位抬高所致。

The results show that the long electrode gap leads to the positive column which is caused by the climbing voltage on the cathode surface due to the accumulation of positive ions.

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