Entire plasmas can be restructured when electrons are emitted from the boundaries

doi:10.1063/1.4918339

Title: Entire plasmas can be restructured when electrons are emitted from the boundaries

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4918339· OSTI ID:22408282

Campanell, M. D., E-mail: michaelcampanell@gmail.com ^[1]

Lawrence Livermore National Laboratory, P.O. Box 808 (L-630), Livermore, California 94551 (United States)

It is well known that electron emission can restructure the thin sheaths at plasma-facing surfaces. But conventional models assume that the plasma's structure negligibly changes (the “presheath” is still thought to be governed by ion acceleration to the Bohm speed). Here, it is shown by theory and simulation that the presheath can take a fundamentally different structure where the emitted electrons entering the quasineutral region cause numerous changes. Gradients of total plasma density, ion and electron pressures, and electric potential throughout the “inverted” presheath can carry different magnitudes, and opposite signs, from Bohm presheaths.

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OSTI ID:: 22408282

Journal Information:: Physics of Plasmas, Vol. 22, Issue 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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Are two plasma equilibrium states possible when the emission coefficient exceeds unity? Campanell, M. D.; Umansky, M. V. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4976856	journal	May 2017
Kinetic modeling of the electronic response of a dielectric plasma-facing solid Bronold, Franz X.; Fehske, Holger Journal of Physics D: Applied Physics, Vol. 50, Issue 29 https://doi.org/10.1088/1361-6463/aa7901	journal	July 2017
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