Berlin 2005 – wissenschaftliches Programm

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P: Plasmaphysik

P 2: Niedertemperaturplasmen / Plasmatechnologie 1

P 2.4: Vortrag

Freitag, 4. März 2005, 12:00–12:15, HU 3038

Electrical characteristics of low-pressure sine wave driven He-Xe lamps — •Detlef Loffhagen, René Bussiahn, Sergey Gorchakov, and Hartmut Lange — INP Greifswald, Friedrich-Ludwig-Jahn-Str. 19, D-17489 Greifswald

Low-pressure discharges in mixtures of xenon with other rare gases are the most promising substitutes for mercury in light sources for publicity lighting. The main disadvantage of such discharges is their lower luminous efficacy in comparison with mercury lamps. In order to improve the output characteristics an optimization of such parameters like mixture composition, pressure, discharge current and operation mode are necessary. The present contribution deals with the electrical characteristics of sine wave driven He-Xe discharges. Experimental studies and self-consistent model calculations have been performed for mixtures of He with 2% Xe at varying mean current density, gas pressure and frequency. The measured and predicted periodic evolutions of discharge voltage and current are reported. Generally good agreement between experimental and calculated results is found. The ionization and heavy particle kinetics are analysed and the most important properties of sine wave driven discharges are discussed in comparison with square wave pulse operation mode.

Supported by BMBF (FKZ: 13N8153)