NDLI: Homogeneous dielectric barrier discharges in atmospheric gases

Content Provider	IEEE Xplore Digital Library
Author	Luo, Haiyun Ran, Junxia Wang, Xinxin
Copyright Year	2012
Description	Author affiliation: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China (Luo, Haiyun; Ran, Junxia; Wang, Xinxin)
Abstract	The homogenous discharges in helium, neon and argon begin with Townsend discharge and end at sub-normal glow discharge. The current limitation by dielectric induces the discharge end before normal glow discharge is reached. Penning ionization between the metastable atoms of the noble gases and impurities plays an important role in the formation of the homogenous discharges. It is easy to realize homogeneous discharge in helium and neon even with a gap as long as 8 mm. However, it is much more difficult to do that in argon even with a gap as short as 2 mm. This different behavior is caused by the difference in the metastable energy. The energies of metastable $He(2^{3}S)$ and $Ne(3^{3}S)$ are 19.8 eV and 16.6 eV, high enough to directly ionize almost all other gases. Argon has a relative low energy of 11.5 eV for metastable $Ar(4^{3}S),$ not high enough to directly ionize other gases. The homogenous discharge in nitrogen was not readily produced but produced in a gap shorter than 3mm and in a limited range of the applied voltage. By addition of a nitrogen flow, a stable homogenous discharge in a 2-mm gap was maintained with a lowest breakdown voltage of 4.9 kV that is significantly lower than the steamer breakdown voltage for this gap. The homogeneous discharge in nitrogen was identified with a Townsend discharge. The release of the shallowly trapped electrons from the dielectric surface plays an important role in providing the discharge with a sufficient amount of the seed electrons, leading to a breakdown of the gap occurring at a significantly lower voltage and the formation of Townsend discharge. The metastable $N^{2}(A^{3}Σ^{+})$ is responsible for releasing the trapped electrons from the dielectric surface. Townsend DBD in nitrogen is extinguished while the gas voltage continues rising up. The extraordinary extinction was explained by the fact that the limited number of the shallowly trapped electrons on the dielectric surface could provide the discharge with sufficient secondary electrons only for a short time. Townsend discharge in air can only be produced with the electrodes covered by specific alumina plates with a thickness of about 2 mm. If the alumina plate is too thin, the discharge transits to filamentary discharge. If it is too thick, the discharge is too weak to observe. The uniqueness of the shallow traps on the surface of the specific alumina plate and the common effect of the current limitation by dielectric work together, leading to a Townsend discharge. The detail mechanisms for the formation of Townsend discharge are still under investigation.
File Size	103065
File Format	PDF
ISBN	9781457721274
ISSN	07309244
e-ISBN	9781457721298
e-ISBN	9781457721281
DOI	10.1109/PLASMA.2012.6383400
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-08
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Discharges (electric) Dielectrics Nitrogen Surface discharges Argon Electron traps
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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