Abstract
It is shown via computer simulations that a protrusion on a thermionic arc cathode may dramatically change the pattern of steady-state modes of current transfer. This happens through a bifurcation of a special type occurring at certain geometry of the cathode and may play a role in operation of electrodes of compact high-intensity discharge lamps.
Highlights
C ONSIDERABLE advances in theoretical and experimental investigation of the plasma–cathode interaction in high-pressure arc discharges have been achieved during the last decade [1]
Steady-state modes of current transfer have been calculated with the use of the commercial software COMSOL Multiphysics, as described in [4]
The other mode (b) exists in a broad range of currents and is S-shaped at currents between 12 and 21 A. This mode is stable with exception of the section of the S-shape comprised between the turning points
Summary
C ONSIDERABLE advances in theoretical and experimental investigation of the plasma–cathode interaction in high-pressure arc discharges have been achieved during the last decade [1]. Steady-state modes of current transfer have been calculated with the use of the commercial software COMSOL Multiphysics, as described in [4].
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