Improved model for cathode spot crater in vacuum arc

Improved model for cathode spot crater in vacuum arc
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真空电弧阴极点弧坑的改进模型

DOI:
10.1088/1361-6463/aaeac0
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发表时间:
2018-11
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
Jia Shenli
Jia Shenli
中科院分区:
其他
文献类型:
--
作者:
Zhang Xiao;Wang Lijun;Ma Jinwei;Wang Yuan;Jia Shenli

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在前人工作的基础上,提出了一种改进的二维轴对称旋涡模型来描述真空弧阴极斑点形成和发展的详细物理过程。在目前的模型中,考虑了等离子体云、蒸发、背离子、热场(T-F)发射、背向扩散电子、自生磁场和洛伦兹力的影响。外部参数包括电子温度、近阴极压降、平均电荷数、离子数密度、空间函数和时间函数。讨论了电流密度、能流密度和外压的组成,并研究了外加参数的影响。模拟结果表明,来自T-F发射的电子电流密度是电流密度的最重要组成部分,而对于能流密度和压力,来自等离子体云的离子通量占主导地位。在相同的外界条件下,难熔金属的烧蚀比易熔金属的烧蚀小得多。仿真结果与其他研究人员的结果吻合较好。
An improved two-dimensional axisymmetric swirl model based on former work has been developed to describe the detailed physical process in the formation and development of vacuum arc cathode spot. In the current model, the influence of plasma cloud, evaporation, backing ion, thermo-field (T-F) emission, back-diffused electron, self-generated magnetic field and Lorentz force are all considered. External parameters include electron temperature, near cathode voltage drop, average charge number, ion number density, space function and time function. The compositions of current density, energy flux density and external pressure are discussed and the influence of external parameters are studied. Simulation results show that electron current density from T-F emission is the most important component for current density; as for energy flux density and pressure, ion flux from plasma cloud is dominant. Ablation on a refractory metal is much less than that on a fusible metal under the same external conditions. The simulation results are in good agreement with other researchers’ results.
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