A Physical Model of the Low-Current-Density Vacuum Arc

Alexander Bolotov, Andrey Kozyrev, Yury Korolev

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    43 Citations (Scopus)


    A one-dimensional (1-D) physical model of the low-current-density steady-state vacuum arc is proposed. The model is based on the continuity equations for ions and electrons and the energy balance for the discharge system; the electric potential distribution in the discharge gap is assumed to be nonmonotonic. It is supposed that the ion current at the cathode is generated within the cathode potential fall region due to the ionization of the evaporated atoms by the plasma thermal electrons having Boltzmann's energy distribution. The model offers a satisfactory explanation for the principal regularities of a hot-cathode vacuum arc with diffuse attachment of the current. The applicability of the model proposed to the explanation of some processes occurring in a vacuum arc, such as the flow of fast ions toward the anode, the current cutoffs and voltage bursts, and the backward motion of a cathode spot in a transverse magnetic field is discussed.

    Original languageEnglish
    Pages (from-to)884-892
    Number of pages9
    JournalIEEE Transactions on Plasma Science
    Issue number6
    Publication statusPublished - 1 Jan 1995

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Condensed Matter Physics

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