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Stability and excitation dynamics of an argon micro-scaled atmospheric pressure plasma jet

M. Dünnbier, M. M. Becker, S. Iseni, R. Bansemer, D. Loffhagen, Stephan Reuter and K. D. Weltmann

Article (2015)

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Abstract

A megahertz-driven plasma jet at atmospheric pressure—the so-called micro-scaled atmospheric pressure plasma jet (μAPPJ)—operating in pure argon has been investigated experimentally and by numerical modelling. To ignite the discharge in argon within the jet geometry, a self-made plasma tuning unit was designed, which additionally enables measurements of the dissipated power in the plasma itself. Discharges in the α-mode up to their transition to the γ-mode were studied experimentally for varying frequencies. It was found that the voltage at the α–γ transition behaves inversely proportional to the applied frequency f and that the corresponding power scales with an f3/2law. Both these findings agree well with the results of time-dependent, spatially one-dimensional fluid modelling of the discharge behaviour, where the f3/2 scaling of the α–γ transition power is additionally verified by the established concept of a critical plasma density for sheath breakdown. Furthermore, phase resolved spectroscopy of the optical emission at 750.39 nm as well as at 810.37 nm and 811.53 nm was applied to analyse the excitation dynamics of the discharge at 27 MHz for different applied powers. The increase of the power leads to an additional maximum in the excitation structure of the 750.39 nm line emission at the α–γ transition point, whereas the emission structure around 811 nm does not change qualitatively. According to the fluid modelling results, this differing behaviour originates from the different population mechanisms of the corresponding energy levels of argon.

Uncontrolled Keywords

argon atmospheric pressure plasma jet, dissipated power, experiment and modelling, α–γ-mode transition, excitation dynamics

Subjects: 3100 Physics > 3100 Physics
3100 Physics > 3107 Plasma physics
3100 Physics > 3108 Experimental methods and instrumentation
Department: Department of Engineering Physics
Funders: German Ministry of Education and Research, German Research Foundation
Grant number: 03Z2DN12, LO 623/3-1
PolyPublie URL: https://publications.polymtl.ca/4851/
Journal Title: Plasma Sources Science and Technology (vol. 24, no. 6)
Publisher: IOP Publishing
DOI: 10.1088/0963-0252/24/6/065018
Official URL: https://doi.org/10.1088/0963-0252/24/6/065018
Date Deposited: 16 Aug 2021 13:38
Last Modified: 05 Apr 2024 17:13
Cite in APA 7: Dünnbier, M., Becker, M. M., Iseni, S., Bansemer, R., Loffhagen, D., Reuter, S., & Weltmann, K. D. (2015). Stability and excitation dynamics of an argon micro-scaled atmospheric pressure plasma jet. Plasma Sources Science and Technology, 24(6). https://doi.org/10.1088/0963-0252/24/6/065018

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