Physics – Plasma Physics
Scientific paper
2010-09-15
IEEE Trans. Plasma Science 39, 644 (2011)
Physics
Plasma Physics
8 pages, 5 figures, published version
Scientific paper
Plasma walls accumulate electrons more efficiently than ions leading to wall potentials which are negative with respect to the plasma potential. Theoretically, walls are usually treated as perfect absorber for electrons and ions implying perfect sticking of the particles to the wall and infinitely long desorption times for particles stuck to the wall. For electrons we question the perfect absorber model and calculate, specifically for a planar dielectric wall, the electron sticking coefficient $s_e$ and the electron desorption time $\tau_e$. For the uncharged wall we find $s_e\ll 1$ and $\tau_e\approx 10^{-4}s$. Thus, in the early stage of the build-up of the wall potential, when the wall is essentially uncharged, the wall is not a perfect absorber for electrons. For the charged wall we find $\tau_e^{-1}\approx 0$. Thus, $\tau_e$ approaches the perfect absorber value. But $s_e$ is still only of the order of $10^{-1}$. Calculating $s_e$ as a function of the wall potential and combining this expression with the quasi-stationary balance equations for the electron and ion surface densities we find the selfconsistent wall potential, including surface effects, to be 30% of the perfect absorber value.
Bronold Franz Xaver
Fehske Holger
Heinisch Rafael L.
Marbach Johannes
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