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

Campanell, M. D.

doi:10.1063/1.4918339

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

Journal Article · Tue Apr 14 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4918339· OSTI ID:1266688

Campanell, M. D. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (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. As a result, 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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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; AC02-09CH11466

OSTI ID:: 1266688

Alternate ID(s):: OSTI ID: 1228596

Report Number(s):: LLNL-JRNL-665867

Journal Information:: Physics of Plasmas, Vol. 22, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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Sheath structure in plasma with two species of positive ions and secondary electrons Zhao, Xiao-Yun; Xiang, Nong; Ou, Jing Chinese Physics B, Vol. 25, Issue 2 https://doi.org/10.1088/1674-1056/25/2/025202	journal	February 2016
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
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

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