Erosion rate and voltage distribution in contracted (with cathode spot) and diffuse (spotless) low-current vacuum arcs

Autor:	V F Puchkarev, S M Chesnokov
Rok vydání:	1992
Předmět:	Acoustics and Ultrasonics Chemistry business.industry Vacuum arc Condensed Matter Physics Erosion rate Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Arc (geometry) Optics Impact crater law Current (fluid) Atomic physics business Current density Voltage
Zdroj:	Journal of Physics D: Applied Physics. 25:1760-1766
ISSN:	1361-6463 0022-3727
DOI:	10.1088/0022-3727/25/12/011
Popis:	The influence of ambient gas pressure and emission current on the potential distribution in a diffuse arc has been studied. The conditions determining the formation of the potential 'hump' near the cathode have been determined. The erosion rate Upsilon approximately=10-3 g C-1 for an individual crater (local erosion rate) has been measured for a contracted vacuum arc. In both types of arc the local erosion rate is well in excess of the erosion rate measured by the weighing method. The conclusion is drawn that most of the evaporated atoms ( approximately= 90%) have to return to the cathode. The diffuse and the contracted vacuum arcs reveal common properties despite a great difference in the current density. The idea of the potential hump can unite both types of arc and explain their characteristics.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::11fb40e0d4c677cf894cca0f993b2268 https://doi.org/10.1088/0022-3727/25/12/011 Zobrazit plný text záznamu