O<sub>2</sub> influence on the spatio-temporal density of Ar(1s5) in micro-plasma jets with varying shieldings
ORAL
Abstract
Argon micro-plasma jets (AMPJs) can be created by streamers propagating along the jet [1], which excite argon species that interact with air [2] or targets [3]. Jets lead to the admixture of ambient species into the main flow, resulting in discharges produced in evolving gas compositions.
We studied the influence of air on a pure AMPJs (1 slm) produced by a square-pulsed sDBD, with two discharges per applied voltage pulse. Using laser absorption spectroscopy, we measured spatiotemporal Ar(1s5) absorbance profiles, to compare its quenching in different N2-O2 shieldings in a co-flow reactor (0.1 to 3 slm and ~0 to 100% of O2). We processed this data into spatiotemporal density and effective-lifetime profiles of Ar(1s5), for both discharges.
Absence of O2 leads to the lowest peak Ar(1s5) density for both discharges and lowers the reproducibility of the first. Increasing O2 fraction increases the propagation velocity of the first discharge and decreases that of the second, with temporal profiles further altered with the radius.
Isolating the effect of O2 on AMPJs could be helpful for future applications, and the obtained data can help validate computational models.
We studied the influence of air on a pure AMPJs (1 slm) produced by a square-pulsed sDBD, with two discharges per applied voltage pulse. Using laser absorption spectroscopy, we measured spatiotemporal Ar(1s5) absorbance profiles, to compare its quenching in different N2-O2 shieldings in a co-flow reactor (0.1 to 3 slm and ~0 to 100% of O2). We processed this data into spatiotemporal density and effective-lifetime profiles of Ar(1s5), for both discharges.
Absence of O2 leads to the lowest peak Ar(1s5) density for both discharges and lowers the reproducibility of the first. Increasing O2 fraction increases the propagation velocity of the first discharge and decreases that of the second, with temporal profiles further altered with the radius.
Isolating the effect of O2 on AMPJs could be helpful for future applications, and the obtained data can help validate computational models.
*Work partially supported by FCT UIDB/50010/2020 & UIDP/50010/2020, and grant PD/BD/142972/2018 (PD-F APPLAuSE).
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Publication: [1] T. Darny et al., Plasma Sources Sci. Technol., 30 2021 105021
[2] Et. Es-sebbar et al., J. Appl. Phys., 126 2019 073302
[3] K. Gazeli et al., J. Phys. D: Appl. Phys., 53 2020 475202
Presenters
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Duarte Gonçalves
- 1-Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa. 2-Université Paris-Saclay, CNRS, Laboratoire de Physique des Gaz et des Plasmas
- 1-Université Paris-Saclay, CNRS, Laboratoire de Physique des Gaz et des Plasmas. 2-Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa