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Progress in Plasma Processing of Materials, 2001

ISBN:
1-56700-165-3 (Print)

THE NEAR CATHODE REGION OF HIGH CURRENT DIVERGENT CHANNEL ARC PLASMATRONS AS A METROLOGICAL OBJECT

A. A. Belevtsev
Associated Institute for High Temperatures, Russian Academy of Science, Izhorskaya 13/19, Moscow, 125412 Russia

V. F. Chinnov
Associated Institute for High Temperatures, Russian Academy of Science, Izhorskaya 13/19, Moscow, 125412 Russia

E. Kh. Isakaev
Science and Engineering Center for Energy-Efficient Processes and Equipment of Joint, Institute for High Temperatures of Russian Academy of Sciences Izhorskaya 13/19, Moscow, 127412, Russia

V. A. Khaimin
Associated Institute for High Temperatures - Russian Academy of Sciences Izhorskaya 13/19,127412 Moscow - Russia

A. V. Markin
Science and Engineering Centre for Energy Efficient Processes and Equipment, Associated Institute for High Temperatures, Russian Academy of Sciences Izhorskaya 13/19, Moscow, 127412, Russia

Abstract

Based on the extended spectroscopic investigations and high-speed visualization of the plasma filament, the view is justified that the near cathode region of atmospheric pressure electric arcs with current densities of 2 kA/cm2 and above in vortex stabilized plasmatrons with a divergent channel hold much promise for various metrological purposes. The developed automated system allows a diverse body of spectroscopic information to be rapidly processed, thus making possible setting up extensive databases on spectral characteristics of heated gases. The thermodynamic state of the generated plasmas is analyzed; the difference between the electron temperature and that of heavy species is estimated. Arguments are advanced in favour of the considered plasmas to be in a partial LTE. The quasi-stationary and local approximations are shown to hold.