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P: Fachverband Plasmaphysik

P 22: Theory and Modelling III

P 22.6: Vortrag

Donnerstag, 3. März 2016, 12:40–12:55, b305

On the pressure exerted by a plasma on a wall — Uwe Czarnetzki and •Tsanko Vaskov Tsankov — Institute for Plasma and Atomic Physics, Ruhr-University Bochum, 44780 Germany

Recent measurements [1] have drawn the attention of the community to the pressure that a plasma exerts on surfaces it is in contact with. However, these high-quality measurements were lacking an ab initio theoretical explanation. Here an analytical model backed up by numerical simulations provide such an explanation.

It is shown that for a 1D case that the sum of all pressures – static and dynamic pressures by the particles and the “pressure” of the electrostatic field – remain constant at each point in the plasma. Therefore, the pressure obtained by the measurements at the walls is equal to the pressure in the center of the plasma, where the static pressure by the electrons is the major contributor. This interpretation of the experimental results provides a novel method for plasma diagnostics. The theory is generalised also for higher dimensions where slight deviations from a constant pressure appear.

[1] Th. Trottenberg, Th. Richter and H. Kersten, Eur. Phys. J. D 69 (2015) 91.