Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 8: Complex Plasmas and Dusty Plasmas I
P 8.4: Talk
Tuesday, February 27, 2024, 12:00–12:15, WW 1: HS
Electrostatic probes in high Havnes nanodusty plasmas — •Franko Greiner1 and Julian Held2 — 1Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — 2Department of Mechanical Engineering, University of Minnesota, Minneapolis, USA
Invasive diagnostics, such as Langmuir probes, pose challenges when employed in nanodusty plasmas with high dust density. When a floating probe is utilized, it establishes a dust-free ’probe void’ around itself. Applying a more negative probe voltage expands this void, while a more positive probe voltage results in a significant dust flow toward the probe upon reaching the plasma potential. Since the plasma potential is unknown, probe contamination and the disruption of the nanodusty plasma become inevitable.
Double probes, which inherently float below the plasma potential at zero voltage bias, appear to be the preferred choice for probes. This choice helps in avoiding probe contamination, and the impact on dust density is minimal across all probe voltages. In our study, we present measurements of ion density and electron temperature in a nanodusty, strongly electron-depleted argon plasma.
Keywords: nanodusty plasma; plasma diagnostic; Havnes effect; reactive plasma; double probes