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Progress in Plasma Processing of Materials, 1997

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

OBSERVATIONS OF THE ARC SPOT ON THE ELECTRIC ARC CATHODE SURFACE

B. Pokrzywka
Mt.Suhora, Observatory of Cracow Pedagogical University, ul. Podchorazych 2, 30-084, Krakow, Poland

K. Musiol
Marian Smoluchowski Inst. of Physics, Jagellonian University, ul. Reymonta 4,30-459 Krakow, Poland

Stephane Pellerin
GREMI, CNRS-Universite d'Orleans, BP 6759, 45067 Orleans Cedex 2, France LASEP, Universite d'Orleans - Antenne de Bourges, BP4043, 18028 Bourges, France

J.-M. Cormier
GREMI-ESPEO, CNRS-Universite d'Orleans, BP 6759, 45067 Orleans Cedex 2, France

J. Chapelle
LASEP, Centre Universitaire de Bourges, Rue Gaston Berger, BP 4043, 18028 Bourges Cedex, France

Abstract

CCD camera images of the near-cathode region of an electric arc, working at atmospheric pressure in argon, permitted to observe some phenomena that take place in this region, e.g., a "dark zone" in the cathode sheath region, low-frequency (f < O.1 Hz) fluctuations of discharge parameters and emitted light, the existence of several hot spots on the cathode surface, different kinds of movements of the arc spot on the cathode surface, and modification of the cathode surface structure.