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Modeling the thermalization of electrons in conditions relevant to atmospheric pressure He-O2 nanosecond pulsed discharges
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Advisor(s)
Abstract(s)
The electron thermalization process is significant in nanosecond pulsed discharges
due to the applied voltage pulse’s short duration and rapid rise and fall times. In this
contribution a comparison was made between two approaches to modeling the electron
kinetics of electron thermalization in atmospheric pressure helium plasma with an oxygen
admixture. Modeling based on the direct solution of the local time-dependent electron
Boltzmann equation was compared with modeling based on the commonly used but less
general local mean energy approximation. For modeling based on the local time-dependent
electron Boltzmann equation, a temporary faster decay in the population of electrons in
the high energy tail, and a slower decay in the population of intermediate energy electrons
was observed while the electron swarm cooled from an average energy of above 8 eV,
without an electric field present. During that period, the electron impact reaction rate
coefficients of helium direct ionization and electronic excitation decreased by more than
3 orders of magnitude as compared to the modeling based on the local mean energy
approximation. Global modeling of the evolution of plasma species densities in response
to an electric field typical of atmospheric pressure pulsed discharges was performed with
the two approaches to electron kinetics. Differences in the species densities were observed
between the two approaches, with an 100% increase in the maximum density of electrons
found with the modeling based on the local mean energy approximation.
Description
Keywords
Electron thermalization Modeling . Faculdade de Ciências Exatas e da Engenharia
Citation
Bieniek, M. S., Walsh, J. L., & Hasan, M. I. (2021). Modeling the thermalization of electrons in conditions relevant to atmospheric pressure He-O 2 nanosecond pulsed discharges. Physics of Plasmas, 28(6), 063501.