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P: Fachverband Plasmaphysik

P 14: Poster Session - Theory and Modelling

P 14.9: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

Modelling and characterization of a microwave driven low pressure lamp based on indium(I)iodide argon system — •Celal Mohan Ögün, Timo Doll, and Rainer Kling — Lichttechnisches Institut des Karlsruher Instituts für Technologie, Karlsruhe, Deutschland

Compact fluorescent lamps struggle with acceptance problems due to the hazardous mercury they contain. Light Technology Institute carries out a project to substitute mercury with non-hazardous metal halides. Thus, a collisional-radiative model of a low pressure plasma based on the indium(I)iodide-argon system is developed. The electron impact cross sections for collisions of the first as well the second kind are calculated by means of Gryzinski method and Klein-Rosseland formula. Additionally, the Gryzinski method is extended for the molecular indium(I)iodide. Furthermore, the lifetimes of each species due to the free and ambipolar diffusions are calculated by Chapman-Enskog-theory. The rate balance equations for individual generation and loss processes have been created. The densities of electrons, heavy particles and line emission coefficients have been calculated as a function of electron temperature for varied lamp parameters, such as argon buffer gas pressure and cold spot temperature. The lamp was characterized experimentally by means of spatially resolved radiance measurements. The measurement results were converted to line emission coefficients with the help of the inverse Abel transform. The plasma parameters were determined by comparing the measured values with the calculated ones from the model.