Paschen's curve in microgaps with an electrode surface protrusion
Abstract
Paschen's curve in microgaps with a hemi-ellipsoidal protrusion on the electrode surface is examined using a two-dimensional fluid model. The breakdown voltage is identified when the discharge enters the subnormal region, according to voltage-current characteristics. It is discovered that the breakdown in a microgap with a surface protrusion on the electrode can result in a combined Paschen's curve, which transits from long-gap (distance between the cathode and anode without the presence of protrusion) behavior at low pressure to short-gap (distance between the protrusion apex to the opposite electrode) behavior at high pressure. As gas pressure decreases, the length of the optimal discharge path increases, automatically moving from the top of the protrusion to its side surface and then to the wider non-protrusion electrode gap. The effects of the protrusion height and radius as well as the discharge polarity on the Paschen's curve are viewed in detail. The effects of the protrusion aspect ratio on field enhancement are also considered. Our report provides insights into the design of microgaps with controlled breakdown voltage across many orders in pressure via engineered electrode morphology.
- Authors:
-
- Michigan State Univ., East Lansing, MI (United States)
- 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:
- 1540248
- Alternate Identifier(s):
- OSTI ID: 1462791
- Grant/Contract Number:
- SC0001939
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 113; Journal Issue: 5; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Fu, Yangyang, Zhang, Peng, and Verboncoeur, John P. Paschen's curve in microgaps with an electrode surface protrusion. United States: N. p., 2018.
Web. doi:10.1063/1.5045182.
Fu, Yangyang, Zhang, Peng, & Verboncoeur, John P. Paschen's curve in microgaps with an electrode surface protrusion. United States. https://doi.org/10.1063/1.5045182
Fu, Yangyang, Zhang, Peng, and Verboncoeur, John P. Fri .
"Paschen's curve in microgaps with an electrode surface protrusion". United States. https://doi.org/10.1063/1.5045182. https://www.osti.gov/servlets/purl/1540248.
@article{osti_1540248,
title = {Paschen's curve in microgaps with an electrode surface protrusion},
author = {Fu, Yangyang and Zhang, Peng and Verboncoeur, John P.},
abstractNote = {Paschen's curve in microgaps with a hemi-ellipsoidal protrusion on the electrode surface is examined using a two-dimensional fluid model. The breakdown voltage is identified when the discharge enters the subnormal region, according to voltage-current characteristics. It is discovered that the breakdown in a microgap with a surface protrusion on the electrode can result in a combined Paschen's curve, which transits from long-gap (distance between the cathode and anode without the presence of protrusion) behavior at low pressure to short-gap (distance between the protrusion apex to the opposite electrode) behavior at high pressure. As gas pressure decreases, the length of the optimal discharge path increases, automatically moving from the top of the protrusion to its side surface and then to the wider non-protrusion electrode gap. The effects of the protrusion height and radius as well as the discharge polarity on the Paschen's curve are viewed in detail. The effects of the protrusion aspect ratio on field enhancement are also considered. Our report provides insights into the design of microgaps with controlled breakdown voltage across many orders in pressure via engineered electrode morphology.},
doi = {10.1063/1.5045182},
journal = {Applied Physics Letters},
number = 5,
volume = 113,
place = {United States},
year = {Fri Aug 03 00:00:00 EDT 2018},
month = {Fri Aug 03 00:00:00 EDT 2018}
}
Web of Science
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