NDLI: Calculation of current density and temperature distributions at the cathode surface using a collisional sheath model

Content Provider	IEEE Xplore Digital Library
Author	Paul, K.C. Takemura, T. Hiramoto, T. Benilov, M. Dawson, F. Erraki, A. Gonzalez, J.J. Zissis, G. Lavers, D. Gleizes, A.
Copyright Year	2004
Description	Author affiliation: R&D Center, Ushio Inc., Shizuoka, Japan (Paul, K.C.; Takemura, T.; Hiramoto, T.)
Abstract	Summary form only given. Thoriated-tungsten is a widely used cathode material in HID (high intensity density) lamps. The degree of thorium coverage, as defined on the tungsten surface may change the current density and temperature distributions at the cathode/plasma interface considerably. This paper presents these distributions that are calculated assuming a collision-dominated sheath. A 1-D model for the micron-order cathode sheath-region of the plasma is developed first to yield heat-flux and current density lookup tables whose entries are a function of cathode surface temperature for a given combined parametric sheath and pre-sheath potential drop. The lookup tables, generated for atmospheric pressure mercury, are used to solve the energy balance and current continuity equations in the cathode body in order to get the current density and temperature distributions at the cathode/plasma interface. Figure 1 shows the current density distributions obtained for a total current of 10 A and for different degrees of surface coverage. Thorium coverage on tungsten changes the work function and Richardson's constant of the surface and therefore, affects the current density distribution.
Sponsorship	Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc
File Size	79174
File Format	PDF
ISBN	0780383346
ISSN	07309244
DOI	10.1109/PLASMA.2004.1339874
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Current density Temperature distribution Cathodes Plasma temperature Plasma density Plasma sheaths High intensity discharge lamps Tungsten Atmospheric-pressure plasmas Table lookup
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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