NDLI: Deviation from LTE conditions in high pressure mercury discharge lamps

Content Provider	IEEE Xplore Digital Library
Author	Elloumi, H. Zissis, G. Charrada, K.
Copyright Year	1998
Description	Author affiliation: Centre de Phys. des Plasmas et de Leurs Applic. de Toulouse, 118 Route de Narbonne, F-31062 Toulouse, France (Elloumi, H.)
Abstract	Summary form only given. Up to now the positive column of high pressure light sources have been investigated mainly as a system in local thermodynamic equilibrium (LTE). Recent measurements in mercury arcs suggest the existence of departures from equilibrium in the axis and in the periphery in such an arc. The deviation from equilibrium leads to complicated distributions such that the plasma cannot be described by a single temperature. In these conditions, the only practical method of investigation is the direct measurement of the neutral atom densities. In the present work we investigate the same range of pressure as Elloumi et al. (1997). We compare the experimental results with those calculated using a two temperature model. The opportunity to compare such densities gave a lot of additional information. Therefore, the results are interpreted in term of nonequilibrium. Results for the lowest pressure (0.2 bar) show that the discrepancy are very pronounced in the arc core and in the periphery of the discharge (the axial density is (0.25/spl times/10/sup 18/ cm/sup -3/), while the departure from equilibrium becomes insignificant for high pressure (the axial density is 6.5/spl times/10/sup 18/ cm/sup -3/).
File Size	106776
File Format	PDF
ISBN	0780347927
ISSN	07309244
DOI	10.1109/PLASMA.1998.677500
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-06-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasma measurements Plasma temperature Atomic measurements Fault location Light sources Thermodynamics Plasma density Plasma sources Temperature distribution Density measurement
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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