Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 3: Plasma Technology I

P 3.1: Hauptvortrag

Montag, 17. März 2014, 14:00–14:30, SPA HS201

Spots on cathodes of DC glow and arc discharges: self-organization theory and its applications — •Mikhail Benilov — Departamento de Fisica, CCEEE, Universidade da Madeira, Largo do Municipio, 9000 Funchal, Portugal

A new class of stationary solutions in the theory of glow discharges and plasma-cathode interaction in arc discharges has been found during the past 15 years. These solutions exist simultaneously with the solution given in textbooks, which describes a discharge mode with a uniform or smooth distribution of current over the cathode surface, and describe modes with various configurations of cathode spots: normal spots on glow cathodes, patterns of multiple spots recently observed on cathodes of glow microdischarges, spots on arc cathodes. In particular, these solutions show that cathode spots represent a manifestation of self-organization caused by basic mechanisms of near-cathode space-charge sheath; another illustration of the richness of the gas discharge science. As far as arc cathodes are concerned, the new solutions have proved relevant for industrial applications. This talk is dedicated to analysis of properties of these solutions and their physical meaning. The analysis is performed in the context of general trends of self-organization in bi-stable nonlinear dissipative systems, which allows one to treat glow discharges and arc-cathode interaction within a single framework and offers a possibility of systematic computation of the multiple solutions. Relevant computational aspects and possible directions of future work are discussed.