3D computations in the discharge channel of the COST reference jet*

A 3D plasma-fluid model is applied to the COST reference jet [1], for calculations in He/O₂ mixtures. The model is based on the formalism and the assumptions of the 2D cross-field plasma model (CFPM) [2], allowing for fast calculations of species densities in the discharge channel of the jet, with a computational cost close to that of a 2D model. The results show that, due to proximity of the inter-electrode to inter-dielectric distance (ratio equal to 1), the phenomena taking place in the inter-dielectric direction (spatial variation of the species and wall losses on the dielectrics), and not considered in 1D and 2D models, cannot be ignored [3,4]. For low values of voltage and gas feed, the average difference of the species densities between the 2D and 3D model, is ~80%.

[1] Golda J, et al. 2016 J. Phys. D: Appl. Phys. 49 084003

[2] Mouchtouris S and Kokkoris G 2021 Plasma Sources Sci. Technol. 30 01LT

[3] Lazzaroni C, Chabert P, Lieberman M A, Lichtenberg A J and Leblanc A 2012 Plasma Sources Sci. Technol. 21 035013

[4] Waskoenig J, Niemi K, Knake N, Graham L M, Reuter S, Gathen V S-v d and Gans T 2010 Plasma Sources Sci. Technol. 19 045018