Apparent secondary-electron emission coefficient and the voltage-current characteristics of argon glow discharges

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Abstract

The accuracy of secondary-electron emission coefficients, that are used as input data of discharge models, seriously influences the calculated discharge characteristics. As it is very difficult to consider all possible electron emission processes of a cold cathode separately, in most of the recent models an apparent secondary coefficient (Formula presented) is applied, which is often assumed to be constant, even for a wide range of discharge conditions. In contrast with this common assumption, the present calculations—based on a heavy-particle hybrid model—show that in abnormal glow discharges (Formula presented) varies considerably with changing discharge conditions: a factor of 3 change of (Formula presented) has been found in the range of reduced current densities (Formula presented) covered in this study. The present simulations also confirm that ionization by heavy particles plays a significant role in the ion production at the abnormal cathode fall. Moreover, it is shown, that the fast heavy particles reflected from the cathode surface play the dominant role in the gas heating.

Original languageEnglish
Number of pages1
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume64
Issue number2
DOIs
Publication statusPublished - Jan 1 2001

Fingerprint

secondary emission
glow discharges
electron emission
Voltage
argon
Electron
electric potential
Coefficient
coefficients
cathodes
cold cathodes
Ionization
Range of data
Heating
Vary
current density
ionization
Model
ions
Simulation

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)

Cite this

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abstract = "The accuracy of secondary-electron emission coefficients, that are used as input data of discharge models, seriously influences the calculated discharge characteristics. As it is very difficult to consider all possible electron emission processes of a cold cathode separately, in most of the recent models an apparent secondary coefficient (Formula presented) is applied, which is often assumed to be constant, even for a wide range of discharge conditions. In contrast with this common assumption, the present calculations—based on a heavy-particle hybrid model—show that in abnormal glow discharges (Formula presented) varies considerably with changing discharge conditions: a factor of 3 change of (Formula presented) has been found in the range of reduced current densities (Formula presented) covered in this study. The present simulations also confirm that ionization by heavy particles plays a significant role in the ion production at the abnormal cathode fall. Moreover, it is shown, that the fast heavy particles reflected from the cathode surface play the dominant role in the gas heating.",
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