Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 6: Poster I

P 6.27: Poster

Monday, February 26, 2024, 16:30–18:30, ELP 6: Foyer

On the use of configurational temperature for an ion focus measurement — •Natascha Blosczyk and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany

Complex plasmas -especially those using micronsized dust grains- allow to study fundamental physical processes. Due to the particle size they attain a large negative charge and allow to study strongly coupled systems in a fluid and crystalline state. However, in the plasma sheath the negatively charged dust grains perturb the ion flow, resulting in a positive space charge region downstream of each particle which modifies the interparticle interaction force. This positive space charge region is called the ion focus and has a non-negligible effect on interaction strength as its charge is comparable to a significant portion of particle charge and its distance to the particle layer is of the order of interparticle distance. However, to determine the strength and position of the ion focus is a difficult task. In this contribution the configurational temperature method will be used to estimate the focus properties. If the particle charge and the screening length are known, the contribution of ion focus in terms of focus strength and position can be estimated from force equilibrium and a configurational temperature fit. The method is tested for results of MD-simulations as well as experimental data.