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JOURNALS // Teplofizika vysokikh temperatur // Archive

TVT, 2019 Volume 57, Issue 3, Pages 338–346 (Mi tvt11054)

This article is cited in 8 papers

Plasma Investigations

Highly ionized helium arc plasma. Determination of the temperature in nonequilibrium conditions and the effect of plasma microfields

O. V. Korshunov, V. F. Chinnov, D. I. Kavyrshin

Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow

Abstract: Methods are proposed for the spectral measurement of electron temperature $T_e$ in a highly ionized nonequilibrium He plasma at atmospheric pressure based on a comparison of the intensities of atomic and ionic lines with a whole complex of experimental data (primarily, $n_e$). The large energy gap between the emitting $\rm HeI$ and $\rm HeII$ excited levels (of more than $50$ eV) and allowance for the nonequilibrium manifested in the overpopulation of the atomic levels with respect to the ionic levels make it possible to make reliable and simple $T_e$ estimates, especially if the ionization energies of the emitting levels of the atom and the ion are close. For practical use, three pairs of $\rm HeI$ and $\rm HeII$ lines observed in the spectral range of $200$$1100$ nm are recommended. The radial and temporal (upon the quasistationary pulsed heating of the electric arc plasma) dependences of $T_e$ are obtained in the range of axial values of $3.2$$4.7$ eV.

UDC: 537.523.5; 533.93

Received: 22.05.2018
Revised: 22.05.2018
Accepted: 10.10.2018

DOI: 10.1134/S004036441902008X


 English version:
High Temperature, 2019, 57:3, 308–315

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