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Progress in Plasma Processing of Materials, 1997

ISBN:
1-56700-093-2 (Print)

On investigation of the physics of near-cathode layers of the metal vapor arcs

Mikhail S. Benilov
Departamento de Fisica, FCEE, Universidade da Madeira, Funchal, Portugal; Instituto de Plasmas e Fusao Nuclear, 1ST, Universidade de Lisboa, Portugal

Abstract

Characteristics of the near-cathode layer are evaluated by means of a conventional macroscopic approach which is based on the concept of quasistationary (non-explosive) emission. An approximate solution is obtained by means of decoupling the equations of electron emission and of balance of the electron energy from a general system of equations describing current transfer across the near-cathode layer of an arc discharge. The obtained data are used for analysis of available experimental data on the near-cathode phenomena in an arc operating in a spotless (diffuse) mode.