Theoretical and experimental determination of gas and electron temperatures for gas discharges in Ne and He mixtures with copper, bromine, hydrogen and strontium

Abstract

Thermal conductivities of binary gas systems are calculated on the basis of 12-6 Lennard-Jones and rigid sphere inter-atomic interaction approximations for the case of gas discharges in He and Ne with small admixtures of copper, bromine, hydrogen and strontium. Assuming that the gas temperature varies only in the radial direction and using the calculated thermal conductivities, an analytical solution of the steady-state heat conduction equation is found for two discharge tube constructions. Two cases of uniform and non-uniform power input are considered. For both cases the average gas temperature is found by averaging the radial gas temperature distribution over the radius. Measurement of the relative intensities of some He and Ne spectral lines, originating from different upper levels, has enabled us to determine the average electron temperature.

A Simple Method for Experimental Determination of Electron Temperature and Electron Density in Nanosecond Pulsed Longitudinal Discharge Used for Excitation of High-Power Lasers

“…Laser Thomson scattering measurements of electron temperature have been proved to be effective but challenging because of the low signal and excessive stray light, as well as the complicated experimental setup. Average and time-resolved electron temperatures, which were experimentally determined by the line-ratio method of optical emission spectroscopy, were reported in [7]- [9] for several metal halide vapor lasers excited by the NPLD. The average values of the electron temperature were also found by averaging the time-resolved electron temperature over the time.…”

Determination of space-time resolved electron temperature in nanosecond pulsed longitudinal discharge in various noble gases and discharge tube constructions

“…This electron temperature was space-time averaged, because space-time averaged relative intensities were measured [3][4][5]. In spite of the fact that the previous results were space-time averaged, the technique of line-ratio measurement of the temperatures proved to be applicable to NPLDs and to provide a wealth of information on those discharges with further refinement.…”

2D numerical modelling of the gas temperature in a high-temperature high-power strontium atom laser excited by nanosecond pulsed longitudinal discharge in a He-SrBr2mixture

“…Assuming that the gas temperature varies only in the radial direction and considering uniform and non-uniform power inputs, gas temperature distributions have been calculated through analytical solution of the steady-state heat-conduction equation in the case of a nanosecond pulsed longitudinal discharge in a series of gas-discharge tube constructions [1,2]. Unfortunately, despite the tremendous efforts, the analytical solution of the abovementioned steady-state heat conduction equation for the 2D (r, z) and 3D (r, ϕ, z) cases encountered some insuperable obstacles.…”