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Cathode-constriction and column-constriction in high current vacuum arcs subjected to an axial magnetic field
| Content Provider | Scilit |
|---|---|
| Author | Zhang, Zaiqin Ma, Hui Liu, Zhiyuan Geng, Yingsan Wang, Jianhua |
| Copyright Year | 2018 |
| Description | Journal: Journal of Physics D: Applied Physics The influence of the applied axial magnetic field on the current density distribution in the arc column and electrodes is intensively studied. However, the previous results only provide a qualitative explanation, which can not quantitatively explain a recent experimental data on anode current density. The objective of this paper is to quantitatively determine the current constriction subjected to an axial magnetic field in high-current vacuum arcs according to the recent experimental data. A magnetohydrodynamic model is adopted to describe the high current vacuum arcs. The vacuum arc is in a diffuse arc mode with an arc current ranged from 6 kArms to 14 kArms and an axial magnetic field ranged from 20 mT to 110 mT. By a comparison of the recent experimental work of current density distribution on the anode, the modelling results show that there are two types of current constriction. On one hand, the current on the cathode shows a constriction, and this constriction is termed as the cathode-constriction. On the other hand, the current constricts in the arc column region, and this constriction is termed as the column-constriction. The cathode boundary is of vital importance in a quantitative model. An improved cathode constriction boundary is proposed. Under the improved boundary, the simulation results are in good agreement with the recent experimental data on the anode current density distribution. It is demonstrated that the current density distribution at the anode is sensitive to that at the cathode, so that measurements of the anode current density can be used, in combination with the vacuum arc model, to infer the cathode current density distribution. |
| Related Links | http://iopscience.iop.org/article/10.1088/1361-6463/aab1ec/pdf |
| ISSN | 00223727 |
| e-ISSN | 13616463 |
| DOI | 10.1088/1361-6463/aab1ec |
| Journal | Journal of Physics D: Applied Physics |
| Issue Number | 14 |
| Volume Number | 51 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2018-02-23 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics D: Applied Physics Applied Physics Condensed Matter Physics Cathode Constriction Column Constriction Vacuum Arcs Density Distribution |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Acoustics and Ultrasonics Condensed Matter Physics Electronic, Optical and Magnetic Materials |
