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P: Plasmaphysik

P 11: Dusty Plasmas and Low Temperature Discharges (Poster Session)

P 11.20: Poster

Thursday, April 5, 2001, 12:30–15:00, AT2

Investigation of High Pressure Arc Discharge Electrodes by Spatial and Time Resolved Spectroscopy and Pyrometry — •Lars Dabringhausen, Oliver Langenscheidt, Marco Redwitz, and Jürgen Mentel — Ruhr University of Bochum, Fundamentals of Electrical Engineering Group, Universitätsstr. 150, 44780 Bochum, Germany

For the investigation of high intensity discharge (HID-)lamps measuring methods were developed and applied to a special model lamp for DC arc discharges. For operation with time-variant currents these methods are extended to get suitable time resolution.

Two methods and first results are presented. One of the most important quantities is the electrode surface temperature, which is measured by a single-wavelength pyrometer. Essential terms of the electrode power balance can be obtained by the temperature distribution along the electrode. Results from spectroscopy on the plasma sheath in front of the electrodes can be used to determine the electron temperature and electron density.

By the measurements the transition between the spot and diffuse mode of current transfer during the cathodic operation phase is characterized.

Financial support supplied by the German Federal Ministry of Education and Research, Ref.-No. 13N7763