Modeling the Voltage Drop Across the Cathode Sheath in HPS

• Published in: IEEE transactions on plasma science Vol. 35; no. 4; pp. 1104 - 1110
• Main Authors: Fabela, J.L.T., Pacheco-Sotelo, J.O., Pacheco, M.P., Benitez-Read, J.S., Lopez-Callejas, R., Zissis, G., Bhosle, S.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.08.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cathode temperature distribution; Cathodes; Conductivity; Discharges for spectral sources (including inductively coupled plasmas); Electric discharges; Electric potential; electrical cathode model (ECM); Electrochemical machining; Electrodes; Electronics; Engineering Sciences; Equations; Exact sciences and technology; Finite element methods; finite-element method; Geometry; high-pressure sodium (HPS) lamps; Lamps; Mathematical models; Optics; Photonic; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Plasmas; Positive columns; Sheaths; Sodium; Temperature; Temperature distribution; Thermal conductivity; Voltage; Voltage drop; Temperature distribution; Positive column; Temperature dependence; Transport equation; Electric discharges; Lamps; Theoretical study; finite-element method; Cathode temperature distribution; High pressure; Design; Finite element method; Emissivity; Sodium; Electric resistivity; Thermal conductivity; Modelling; high-pressure sodium (HPS) lamps; electrical cathode model (ECM); Heat transfer

An electrical cathode model (ECM) of a high-pressure sodium (HPS) lamp based on physical laws has been developed. The proposed ECM calculates the instantaneous voltage drop in a cathode sheath and the temperature distribution inside the cathode using as input parameter the cathode geometry and the p...