An investigation of mercury hollow cathode phenomena
An investigation of mercury hollow cathode phenomena
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汞空心阴极现象的研究
DOI：
10.2514/6.1978-705
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
P. Wilbur
中科院分区：
文献类型：
--
作者：
D. Siegfried;P. Wilbur
描述了一种实验研究，其中测量等离子体的性能和其他物理参数的上游和下游的孔板的工作汞空心阴极。这些测量包括等离子体特性曲线，内表面温度，内部压力，和光谱数据的外部放电。结果表明，羽流到斑点模式过渡的特点是显着变化的等离子体特性的下游的阴极孔，包括消失的一个明显的电子自由落体区域，这是发现存在于羽流模式。结果还表明，存在一个非常密集的等离子体（10至10至14次电子/立方厘米）与陡峭的电子密度梯度的区域上游的孔。上游的数据被发现与修改后的形式的萨哈方程。相关的分析表明，重粒子接近热平衡的电子在该地区的孔和孔的电离分数是非常高的- 80至100%。
An experimental investigation is described in which measurements were made of plasma properties and other physical parameters upstream and downstream of the orifice plate of an operating mercury hollow cathode. These measurements included plasma property profiles, internal surface temperatures, internal pressure, and spectroscopic data of the external discharge. The results show the plume-to-spot mode transition to be characterized by significant changes in the plasma properties downstream of the cathode orifice, including the disappearance of an apparent electron free-fall region which is found to be present in the plume mode. The results also indicate the existence of a very dense plasma (10 to the 10th to 10 to the 14th electrons/cu cm) with steep electron density gradients in the region upstream of the orifice. The upstream data is found to correlate well with a modified form of the Saha equation. The related analysis indicates that the heavy particles approach thermal equilibrium with the electrons in the region of the orifice and that the ionization fraction in the orifice is very high - 80 to 100%.