Open AccessOn possible reasons of positive near-anode voltage drop in high-current vacuum arc
Author(s) -
D. L. Shmelev,
S. A. Barengolts,
M. M. Tsventoukh,
I. V. Uimanov,
L. Wang
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1393/1/012026
Subject(s) - anode , voltage drop , drop (telecommunication) , plasma , current (fluid) , atomic physics , mean free path , cathode , constriction , mechanics , arc (geometry) , materials science , chemistry , electron , electrode , electrical engineering , physics , thermodynamics , cardiology , medicine , geometry , mathematics , quantum mechanics , engineering
In this paper we consider some reasons for the occurrence of a positive near-anode potential drop during current constriction in high-current vacuum arc. It is shown that if the radius of constriction is much larger than the electron mean free path, then a positive voltage drop in the near-anode plasma sheath does not occur, but an additional drop may occur in the near-anode plasma layer due to the anomalous resistance. If the current constriction radius is much less than the electron mean free path, then a positive voltage drop in the sheath arises under the usual condition, and the kinetic instabilities in the near-anode plasma do not develop.