Spatio-temporal electric field distributions in an atmospheric plasma jet impinging on a microchannel array surface

Raskar, S.; Adamovich, I. V.; Konina, K.; Kushner, M. J.

doi:10.1088/1361-6595/ad2117

Spatio-temporal electric field distributions in an atmospheric plasma jet impinging on a microchannel array surface

Journal Article · Thu Feb 08 23:00:00 EST 2024 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/ad2117· OSTI ID:2331497

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The Ohio State Univ., Columbus, OH (United States); University of Michigan
The Ohio State Univ., Columbus, OH (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

The electric field distribution in the ionization waves (IWs) propagating over a microchannel array dielectric surface, with the channels either empty or filled with distilled water, is measured by ps electric field induced second harmonic generation. The surface IW is initiated by the atmospheric pressure N₂–Ar plasma jet impinging on the surface vertically and powered by ns pulse discharge bursts. The results show that the electric field inside the microchannels, specifically its horizontal component, is enhanced by up to a factor of 2. The field enhancement region is localized within the channels. The vertical electric field inside the channels lags in time compared to the field measured at the ridges, indicating the transient reversal of the IW propagation direction across the channels (toward the jet). This is consistent with the phase-locked plasma emission images and confirmed by the kinetic modeling predictions, which show that the IW ‘jumps’ over the empty channels and propagates into the channels only after the jump between the adjacent ridges. When the channels are filled with water, the wave speed increases by up to 50%, due to the higher effective dielectric constant of the surface. No evidence of a significant electric field enhancement near the dielectric surface (ceramic or water) has been detected, within the spatial resolution of the present diagnostic, ~100 μm.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0020232

OSTI ID:: 2331497

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 2 Vol. 33; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
atmospheric pressure plasma jets
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Spatio-temporal electric field distributions in an atmospheric plasma jet impinging on a microchannel array surface

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