Bulletin of the American Physical Society
76th Annual Gaseous Electronics Conference
Volume 68, Number 9
Monday–Friday, October 9–13, 2023; Michigan League, Ann Arbor, Michigan
Session GR4: Modeling & Simulation V: Validation and Verification
1:30 PM–3:30 PM,
Thursday, October 12, 2023
Room: Michigan League, Henderson
Chair: Andrew Tasman Powis, Princeton Plasma Physics Laboratory
Abstract: GR4.00006 : Modelling the vibrational non-equilibrium dynamics in a pure N2 discharge: interplay of transport and power deposition
3:00 PM–3:15 PM
Presenter:
Margherita Altin
(Maastricht University)
Authors:
Margherita Altin
(Maastricht University)
Pedro Viegas
(Instituto Superior Técnico - Universidade de Lisboa)
Luca Vialetto
(Kiel University)
Paola Diomede
(Maastricht University)
Gerard J Van Rooij
(Maastricht University)
A 1D radial time-resolved self-consistent model has been developed to study the mechanism of formation of vibrationally excited N2. Temporal and spatial profiles of gas and vibrational temperature, spontaneous optical emission, electron density and electron temperature are compared to validate the model and the choice of input power density against experimental measurements in a pulsed N2 discharge.
The model reveals two regions in the plasma: a core where chemistry is dominated by power deposition and where vibrational excitation proceeds on a time scale of ~10 μs and an outer region reliant on radial transport, where vibrational excitation happens slowly during the whole length of the pulse (200 μs). The two regions are separated by a sharp gradient in the estimated deposited power density. The latter is revealed to not be in a direct proportionality relation with the emission intensity.
The low concentration of excited species outside the prevents the gas from heating and the reduced quenching rates prevent the destruction of vibrationally excited N2 and thereby maintain the observed high non-equilibrium.
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