Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session CP11: Poster Session II: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Low Aspect Ratio; Superconducting
FUND: Nonneutral, Antimatter, Strong coupled Plasmas; Waves
2:00 PM - 5:00 PM
Monday, October 17, 2022
Room: Exhibit Hall A and Online
Abstract: CP11.00084 : Ionic Heating of N2 and O2 Gas Discharges
Presenter:
Brett Scheiner
(Los Alamos National Laboratory)
Authors:
Brett Scheiner
(Los Alamos National Laboratory)
Mark C Zammit
(LANL)
Matthew M Hopkins
(Sandia National Laboratories)
Christopher H Moore
(Sandia National Laboratories)
Eddy M Timmermans
(Los Alamos Natl Lab)
We explore the heating mechanisms of N2 and O2 neutral gas in discharges using 0D and 1D PIC-DSMC simulations for cases where either a constant or self-consistently determined electric field is applied. Previously, heating on nanosecond timescales has been attributed to quenching of excited states of neutral atoms (e.g. O(1D) + O2 -> O + O2) that converts energy in electronic states into kinetic energy of the neutral gas. While this is generally true for weakly ionized discharges, another process that contributes at larger values of E/N and gas fractional ionization is direct heating by ions in elastic collisions with the background gas. These simulations demonstrate that in cases where the fractional ionization of the gas is large, the heating from ion-neutral collisions dominates over other mechanisms. Even for relatively weakly ionized discharges (~1% ionization), the energy input into the gas from ionic heating can be considerable.
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