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Progress in Plasma Processing of Materials, 2001

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

Simulating the energy balance of a high-pressure sulphur discharge

C. Johnston
Equilibrium and Transport in Plasmas, Department of Applied Physics, Technische Universiteit Eindhoven, Postbus 5600 MB, Eindhoven

Harm van der Heijden
Department of Applied Physics, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands

G. M. Janssen
Department of Applied Physics, NLf 1.0.4, Technische Universiteit Eindhoven, 5600 MB Eindhoven, The Netherlands

J. van Dijk
Department of Applied Physics, Eindhoven University of Technology P.O. Box 513, 5600 MB Eindhoven, The Netherlands

Joost J. A. M. van der Mullen
Department of Applied Physics, Eindhoven University of Technology, P. O. Box 513, 5600 MB Eindhoven, The Netherlands

Abstract

High-pressure sulphur discharges display two main attractive lighting properties, principally high efficiency and good colouring, which stem from the fact that the light is molecular in origin. However the substantial number of radiative transitions (~105) within the sulphur molecule hampers detailed study. To further our understanding of the discharge we have used the plasma simulation program, PLASIMO [1], developed at the Equilibrium and Transport in Plasmas (ETP) group in Eindhoven. With PLASIMO we model the LTE energy balance of a high-pressure microwave powered sulphur discharge with some argon as a buffer gas. We present the model and briefly examine the technique used to deal with radiation, the quasi-static or so-called Classical Franck-Condon approach [2]. We find that within the limitations of this approach the spectrum and operational trends reflected in the spectrum can be described.