放电管：装有低压气体的封闭绝缘容器，当电极有足够的电压时，通过它电流就开始流动。
Discharge tube: a closed insulating vessel containing a gas at low pressure through which an electric current flows when sufficient voltage is applied to its electrodes.
此“ 先期放电”不但清除了部份的壁电荷还增加空间中带电荷粒子数量并使得其后产生的维持放电可于较低电压时开始。
The pre-discharge not only eliminates partial wall charges but also increases density of priming particles which help the coplanar-type discharge start at a lower cell voltage.
本发明在放电时，通过放电单元中心部较强电场减少放电开始电压以及放电维持电压。
In the process of discharge, the invention can reduce the discharge initial voltage and the discharge maintaining voltage via the stronger electric field of the center of discharge unit.
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