Bulletin of the American Physical Society
77th Annual Gaseous Electronics Conference
Monday–Friday, September 30–October 4 2024; San Diego, California
Session IR4: Plasma Diagnostics IV
1:30 PM–3:30 PM,
Thursday, October 3, 2024
Room: Great Room 5
Chair: Uwe Czarnetzki, Ruhr University Bochum
Abstract: IR4.00007 : In-liquid nanosecond-pulsed plasma: comparison of water and liquid nitrogen, and estimations of electric fields*
3:15 PM–3:30 PM
Presenter:
Danil Dobrynin
(Drexel University)
Authors:
Danil Dobrynin
(Drexel University)
Alexander Fridman
(Drexel University)
Zhiheng Song
(Drexel university)
Using imaging and optical emission spectroscopy, we estimate neutrals temperatures and densities, as well as local electric field values, and the obtained results indicate that the discharge develops via streamer (“electronic”) mechanism. We show that mm-scale plasma propagates in liquid nitrogen with the velocities of ~500 km/s with corresponding required local electric fields as high as 25 MV/cm, while estimated local electric field in the “core” of the discharge are around 6-8 MV/cm (corresponding to reduced electric field values of 600-1000 Td). The neutral and electron densities in the “main body” of the discharge were done using broadened argon lines, indicating that the neutral densities in the near-electrode region are around 1020 cm-3 (tens of atmospheres), while maximum recorded temperature was just a few tens of degrees above the surrounding liquid. Electron densities were estimated to be ~1017 cm-3, about two orders of magnitude lower that those measured for water discharge.
*This work was supported by the US National Science Foundation award # 2108117, PI: Dobrynin.
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