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Transition characteristics and electron kinetics in microhollow cathode discharges

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0033282· OSTI ID:1850773
 [1];  [2];  [3];  [4];  [5]
  1. Michigan State Univ., East Lansing, MI (United States). Dept. of Computational Mathematics, Science and Engineering; Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering; Michigan State Univ., East Lansing, MI (United States)
  2. Michigan State Univ., East Lansing, MI (United States). Fraunhofer Center for Coatings and Diamond Technologies
  3. Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering
  4. Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering; Michigan State Univ., East Lansing, MI (United States). Fraunhofer Center for Coatings and Diamond Technologies; Michigan State Univ., East Lansing, MI (United States). Dept. of Chemical Engineering and Material Science
  5. Michigan State Univ., East Lansing, MI (United States). Dept. of Computational Mathematics, Science and Engineering; Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering
We demonstrate the transition characteristics and electron kinetics of microdischarges in a microgap with a cathode having microstructures using two-dimensional particle-in-cell/Monte Carlo collision (2d3v) simulations. It is found that the microdischarge is inside the hollow cavity at lower pressures, forming microhollow cathode discharges (MHCDs), while the dominant discharge moves outside the cavity at higher pressures, locating above the cathode rectangular protrusion tip. The spatial distributions of the microdischarge parameters (e.g., electric potential and electron density) are presented by capturing the transition characteristics. The electron kinetics of the microdischarges are examined based on the moment analysis of the electron Boltzmann equation. The collisional and non-collisional components of the electron power absorption are decomposed, which were seldomly investigated for microdischarges previously. The results provide fundamental insights into MHCD formation with a structured electrode at varying pressure conditions, which could be beneficial for the design and fabrication of microplasma devices in practical applications.
Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0001939
OSTI ID:
1850773
Alternate ID(s):
OSTI ID: 1756214
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 2 Vol. 129; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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