Gas breakdown and its scaling law in microgaps with multiple concentric cathode protrusions
Abstract
This work reports gas breakdown characteristics in microgaps with multiple concentric protrusions on the cathode in the transition from the Townsend to the subnormal glow discharge regime, using a two-dimensional hydrodynamic model. The effects of the protrusion aspect ratio, height, and protrusion spacing on the breakdown voltage are investigated. The results show that when the protrusion spacing is small, the shielding effect can play a more important role in the breakdown voltage rather than the protrusion aspect ratio; the breakdown voltage is more sensitive to the protrusion height and can be assessed by the shortest gap distance. Increasing the protrusion spacing decreases the shielding effect, which lowers the breakdown voltage in both low- and high-pressure regimes. It is found that the breakdown scaling law still holds in geometrically similar microgaps with multiple cathode protrusions despite the electric field distortion.
- Publication Date:
- Research Org.:
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); US Air Force Office of Scientific Research (AFOSR)
- OSTI Identifier:
- 1610600
- Grant/Contract Number:
- SC0001939; FA9550-18-1-0062; FA9550-18-1-0061
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 114; Journal Issue: 1; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; physics
Citation Formats
Fu, Yangyang, Zhang, Peng, Krek, Janez, and Verboncoeur, John P. Gas breakdown and its scaling law in microgaps with multiple concentric cathode protrusions. United States: N. p., 2019.
Web. doi:10.1063/1.5077015.
Fu, Yangyang, Zhang, Peng, Krek, Janez, & Verboncoeur, John P. Gas breakdown and its scaling law in microgaps with multiple concentric cathode protrusions. United States. https://doi.org/10.1063/1.5077015
Fu, Yangyang, Zhang, Peng, Krek, Janez, and Verboncoeur, John P. Wed .
"Gas breakdown and its scaling law in microgaps with multiple concentric cathode protrusions". United States. https://doi.org/10.1063/1.5077015. https://www.osti.gov/servlets/purl/1610600.
@article{osti_1610600,
title = {Gas breakdown and its scaling law in microgaps with multiple concentric cathode protrusions},
author = {Fu, Yangyang and Zhang, Peng and Krek, Janez and Verboncoeur, John P.},
abstractNote = {This work reports gas breakdown characteristics in microgaps with multiple concentric protrusions on the cathode in the transition from the Townsend to the subnormal glow discharge regime, using a two-dimensional hydrodynamic model. The effects of the protrusion aspect ratio, height, and protrusion spacing on the breakdown voltage are investigated. The results show that when the protrusion spacing is small, the shielding effect can play a more important role in the breakdown voltage rather than the protrusion aspect ratio; the breakdown voltage is more sensitive to the protrusion height and can be assessed by the shortest gap distance. Increasing the protrusion spacing decreases the shielding effect, which lowers the breakdown voltage in both low- and high-pressure regimes. It is found that the breakdown scaling law still holds in geometrically similar microgaps with multiple cathode protrusions despite the electric field distortion.},
doi = {10.1063/1.5077015},
journal = {Applied Physics Letters},
number = 1,
volume = 114,
place = {United States},
year = {Wed Jan 09 00:00:00 EST 2019},
month = {Wed Jan 09 00:00:00 EST 2019}
}
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