Microscopic theory of electron absorption by plasma-facing surfaces
Abstract
We describe a method for calculating the probability with which the wall of a plasma absorbs an electron at low energy. The method, based on an invariant embedding principle, expresses the electron absorption probability as the probability for transmission through the wall's long-range surface potential times the probability to stay inside the wall despite of internal backscattering. To illustrate the approach we apply it to a \SiOTwo\ surface. Besides emission of optical phonons inside the wall we take elastic scattering at imperfections of the plasma-wall interface into account and obtain absorption probabilities significantly less than unity in accordance with available electron-beam scattering data but in disagreement with the widely used perfect absorber model.
Cite
@article{arxiv.1607.02851,
title = {Microscopic theory of electron absorption by plasma-facing surfaces},
author = {Franz X. Bronold and Holger Fehske},
journal= {arXiv preprint arXiv:1607.02851},
year = {2017}
}
Comments
8 pages, 7 figures. arXiv admin note: text overlap with arXiv:1506.06356