Paper Title:
Application of WFS for Simultaneous Work Function and Secondary Electron Emission Measurement on Ba Covered Tungsten
  Abstract

In the present paper the secondary emission and work function of W covered with different thickness Ba layers are compared. The secondary emission and work function were measured by Work Function Spectroscopy (WFS). It is clearly pointed out that the thin Ba coating causes the the enhancement of electron induced secondary electron emission. In high pressure discharge lamps high secondary emission and high thermionic current are required for reliable operating conditions, i.e., for reaching the nominal burning voltage and current etc. The results prove that the Ba spreading on the W surface from an alkali earth tungstate material is advantageous for lowering the work function and, simultaneously, for increasing the secondary emission yield.

  Info
Periodical
Materials Science Forum (Volumes 473-474)
Edited by
J. Gyulai
Pages
293-296
DOI
10.4028/www.scientific.net/MSF.473-474.293
Citation
G. Vida, I. Beck, V. K. Josepovits, M. Győr, "Application of WFS for Simultaneous Work Function and Secondary Electron Emission Measurement on Ba Covered Tungsten ", Materials Science Forum, Vols. 473-474, pp. 293-296, 2005
Online since
January 2005
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Price
$32.00
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