Loading...
Publication
Multiple solutions in the theory of dc glow discharges
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 931.32 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Multiple steady-state solutions existing in the theory of dc glow discharges are computed for
the first time. The simulations are performed in 2D in the framework of the simplest
self-consistent model, which accounts for a single ion species and employs the drift–diffusion
approximation. Solutions describing up to nine different modes were found in the case where
losses of the ions and the electrons due to diffusion to the wall were neglected. One mode is
1D, exists at all values of the discharge current, and represents in essence the well-known
solution of von Engel and Steenbeck. The other eight modes are axially symmetric, exist in
limited ranges of the discharge current, and are associated with different patterns of current
spots on the cathode. The mode with a spot at the centre of the cathode exhibits a well
pronounced effect of normal current density. Account of diffusion losses affects the solutions
dramatically: the number of solutions is reduced, a mode appears that exists at all discharge
currents and comprises the Townsend, subnormal, normal and abnormal discharges. The
solutions that exist in limited current ranges describe patterns, and these patterns seem to
represent axially symmetric analogues of the 3D patterns observed in dc glow microdischarges
in xenon.
Description
Keywords
Theory of dc glow discharges DC glow discharges Glow discharges . Faculdade de Ciências Extas e da Engenharia
Citation
Almeida, P. G., Benilov, M. S., & Faria, M. J. (2010). Multiple solutions in the theory of dc glow discharges. Plasma Sources Science and Technology, 19(2), 025019. DOI: 10.1088/0963-0252/19/2/025019
Publisher
IOP Publishing