München 2019 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 3: Plasma Surface Interaction I
P 3.4: Vortrag
Montag, 18. März 2019, 12:15–12:30, HS 21
Towards an understanding of the force low-temperature plasmas exert on walls — •Thomas Trottenberg and Holger Kersten — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel
Low-temperature plasmas exert tiny forces (µN cm−2) on their solid bondaries. Recent force measurements, where small test surfaces were brought in contact with a plasma, have shown that the “plasma pressure” is in the order of magnitude of the electron pressure [1,2]. However, the measured forces range from significantly smaller forces up to a few times the electron pressure force. So far, only qualitative descriptions of the underlying mechanisms for this behavior could be presented [1,2]. A one-dimensional fluid model (including spherically symmetric geometry) was applied in a general treatment of the problem, and it was concluded that the pressure at the wall should equal the electron pressure in the center of the discharge [3]. However, the found systematic deviations remained unexplained. In this study, we provide a short summary of the experiments performed in Kiel so far with force measurements in capacitively-coupled radio-frequency discharges and microwave-generated plasmas, and we report on our latest attempts to understand the observed features of the force.
[1] Trottenberg, Richter, and Kersten, Eur. Phys. J. D 69, 91 (2015).
[2] Trottenberg and Kersten, Plasma Sources Sci. Technol. 26, 055011 (2017).
[3] Czarnetzki and Tsankov, Eur. Phys. J. D 69, 236 (2015).