Gap length dependence of two-dimensional electron and copper vapour density distribution over vacuum plasma
Gap length dependence of two-dimensional electron and copper vapour density distribution over vacuum plasma
复制标题
真空等离子体上二维电子和铜蒸气密度分布的间隙长度依赖性
DOI：
10.1088/1748-0221/10/12/c12007
复制
发表时间：
2015
影响因子：
1.3
通讯作者：
K. Hidaka
中科院分区：
文献类型：
--
作者：
Y. Inada;T. Kamiya;S. Matsuoka;A. Kumada;H. Ikeda;K. Hidaka
利用Shack-Hartmann型激光波前传感器对真空等离子体击穿阶段和持续弧段的二维电子和铜蒸气密度分布进行了同时可视化研究。我们对铜电极间距为3 mm的实验结果表明，真空击穿阶段的电子主要来自从阳极蒸发的铜蒸气的电离过程。此外，在强烈的弧光模式下，3 mm间隙的电子和铜蒸气密度与我们以前实验中1.2 mm间隙的电子和铜蒸气密度相当。同时记录的电压和电流波形验证了观测结果的有效性，表明弧柱电导随间隙长度的增加而成反比下降。
Shack-Hartmann type laser wavefront sensors were used for simultaneous visualisation of two-dimensional electron and copper vapour density distributions over vacuum plasmas in a breakdown phase and sustainable arc phase. Our experimental results for a 3-mm gap between Cu electrodes showed that the electrons in the vacuum breakdown stage were mainly supplied from the ionisation process of the copper vapour evaporating from the anode. In addition, the electron and copper vapour densities in an intense arc mode for the 3-mm gap were comparable to those for the 1.2-mm gap in our previous experiments. The validity of the observation results was verified by simultaneously recorded voltage and current waveforms demonstrating an inversely proportional decrease in arc column conductance with increasing gap length.