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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

Impact factor: 0.058

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v11.i3.110
pages 443-454

COLOR SEGREGATION IN METAL-HALIDE LAMPS: EXPERIMENTAL AND NUMERICAL INVESTIGATIONS

W. J. M. Brok
Eindhoven University of Technology, Department of Applied Physics, P.O.Box 513, DenDolech 2, Eindhoven, the Netherlands
T. Nimalasuriya
Eindhoven University of Technology, Department of Applied Physics, P.O.Box 513, DenDolech 2, Eindhoven, the Netherlands
A. Hartgers
Eindhoven University of Technology, Department of Applied Physics, P.O.Box 513, DenDolech 2, Eindhoven, the Netherlands
M. L. Beks
Eindhoven University of Technology, Department of Applied Physics, P.O.Box 513, DenDolech 2, Eindhoven, the Netherlands
M. Haverlag
Philips Lighting, Central Development Lamps, P.O. Box 80020, 5600 JM Eindhoven, The Netherlands; and Eindhoven University of Technology, Department of Applied Physics, P.O.Box 513, DenDolech 2, Eindhoven, the Netherlands
W. W. Stoffels
Eindhoven University of Technology, Department of Applied Physics, P.O.Box 513, DenDolech 2, 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

The COST reference lamp is a High Intensity Discharge (HID) Metal-Halide (MH) lamp that has been designed to introduce a unified lamp system used in experimental investigations and numerical simulations done by various groups working on HID lamps. By using this lamp, designed to be accessible for a variety of diagnostic techniques, measurements of various plasma parameters can be fitted together to obtain a more complete understanding of the physics of these lamps. In this paper we discuss the mechanisms responsible for colour segregation in MH lamps. The discussion is aided by experimental and numerical data obtained from studies of the COST lamp: emission spectroscopy under varying gravity conditions, x-ray induced fluorescence and numerical modelling by means of the two-dimensional fluid model toolkit Plasimo.