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Title: 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:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. 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. doi: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. doi: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 = {2018},
month = {8}
}

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Cited by: 5 works
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