Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 9: Low Pressure Plasmas III
P 9.4: Vortrag
Mittwoch, 18. März 2026, 12:00–12:15, KH 01.020
Characterization of millimeter-sized low-pressure argon plasmas in aeroglass — Karin Hansen1, Jonas Lumma2, Rainer Adelung2, and •Franko Greiner1 — 1Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — 2Department of Materials Science, Kiel University, Kiel, Germany
Electrodes and other solid boundaries are invariably separated from the plasma by a layer known as the plasma sheath. Depending on the discharge pressure, this sheath has a minimum thickness on the order of the electron Debye length. The intrinsic properties of the material and its surface structure may affect the plasma. Macroscopic gaps in the surface are only filled with plasma if their size is comparable to the sheath thickness. To study how plasma-facing walls made from aeroglass[1] influence the characteristics of a low-pressure argon discharge, we generated a plasma inside a millimeter bore in an aeroglass cylinder with a height of 8 mm and a diameter of 8 mm. Since the ratio of interface area to plasma volume increases as the bore radius decreases, any influence of the aeroglass should become observable for these small systems. Plasma diagnostics were carried out using electrostatic double probes. At discharge pressures of about 1000 Pa, we observed a high-density plasma mode that does not occur with conventional wall materials.
[1] Lena M. Saure et al., ACS Nano 2023, 17, 22, 22444*22455, DOI: 10.1021/acsnano.3c05329
Keywords: multiscaled aeroglass; electrostatic double probes; low pressure plasma; plasma in millimeter bores; material properties