NDLI: Plasma Walls Beyond the Perfect Absorber Approximation for Electrons

Content Provider	IEEE Xplore Digital Library
Author	Bronold, F.X. Heinisch, R.L. Marbach, J. Fehske, H.
Copyright Year	1973
Abstract	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 τ_e. For the uncharged wall, we find s_e ≪ 1 and τ_e≈ 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 τ_e^-1≈ 0. Thus, τ_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 self-consistent wall potential, including surface effects, to be 30% of the perfect absorber value.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	644
Ending Page	651
Page Count	8
File Size	301472
File Format	PDF
ISSN	00933813
Volume Number	39
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric potential Plasmas Surface treatment Dielectrics Charge carrier processes Electron microscopy Potential energy wall charging Plasma sheath plasma–wall interaction
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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