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Communication Dans Un Congrès Année : 2021

Electric field behavior of a modular-constructed micro cavity plasma array (MCPA) by using Stark shift and splitting of the 492nm helium line

Résumé

Micro-structured array devices get more and more interest for gas reformation and plasma catalysis. In the case of devices where cavities are integrated in the dielectric the applied electric field can strongly influence the interaction between plasma and catalyst[1]. Here, we present a metal-grid array device consisting of a high-voltage driven nickel grid, an electrical grounded magnet and a ceramic foil as dielectric in between. In contrast to silicon-based devices developed by G. Eden[2], the metal-grid array has a sufficient lifetime under laboratory conditions for long-term optical diagnostics. The 50 μm thick nickel grid contains hundreds to thousands of uniformly arranged cavities with dimensions in the 100 μm scale. This sandwich-like structure allows disassembling and exchange of the dielectric foil and the nickel grid due to the magnetic mounting[3]. Therefore, a dielectric with a catalytic coating and a nickel electrode containing a channel in place of the cavities can be integrated. Typically, the metal-grid array operates close to atmospheric pressure and is applied with a bipolar triangular voltage waveform with an amplitude up to 800 V at a frequency of about 15 kHz. To measure the macroscopic electric field, we use the 492.19 nm helium line that gets split in an allowed and a forbidden counterpart in presence of high electric field ( 5 kV/cm) shown in Fig 1. The distance between these two components is proportional to the electric field and was theoretically determined firstly by using a perturbation theory by Foster [4]. In contrast to already known methods for determining the electric field strengths, this kind of measurement just depends on quantum mechanical relations and with that it is complete independent on further plasma parameters such as the EEDF. Furthermore, an additional admixture of nitrogen is also not necessary. The cavity integrated emission is captured with a collimator and transferred with an optical fiber to a two-meter-long plane grating spectrograph with an attached ICCD-camera since the displacement between the two components is in the range of a tenth of a nanometer. We present and discuss time and spatial averaged measurements depending on typical operation parameters such as the applied voltage, cavity diameter(see Fig.2), frequency and pressure. References: [1]Yu-Ru Zhang et al.Applied Catalysis B: Environmental185 (2016) [2]G. Eden et al. J. Phys. D: Appl. Phys. 38 (2005) 1644-1648 [3]S. Dzikowski et al. PSST 29 035028 (2020) [4]J. S. Foster et al. Proc. R Soc. Lond. Ser. A 117 137 (1927)
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hal-03205106 , version 1 (22-04-2021)

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  • HAL Id : hal-03205106 , version 1

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Sebastian Dzikowski, Sylvain Iséni, Marc Böke, Volker Volker Schulz-von Der Gathen. Electric field behavior of a modular-constructed micro cavity plasma array (MCPA) by using Stark shift and splitting of the 492nm helium line. MGK Colloquium - Transient Atmospheric Plasmas: from plasmas to liquids to solids, Apr 2021, Bochum, Germany. ⟨hal-03205106⟩
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