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Title: Sheath energy transmission in a collisional plasma with collisionless sheath

Abstract

Sheath energy transmission governs the plasma energy exhaust onto a material surface. The ion channel is dominated by convection, but the electron channel has a significant thermal conduction component, which is dominated by the Knudsen layer effect in the presence of an absorbing wall. First-principle kinetic simulations also reveal a robustly supersonic sheath entry flow. The ion sheath energy transmission and the sheath potential are accurately predicted by a sheath model of truncated bi-Maxwellian electron distribution. The electron energy transmission is further enhanced by a parallel heat flux of the perpendicular degrees of freedom.

Authors:
ORCiD logo [1]; ORCiD logo [1]
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
OSTI Identifier:
1457235
Alternate Identifier(s):
OSTI ID: 1224222
Report Number(s):
LA-UR-15-22389
Journal ID: ISSN 1070-664X; PHPAEN; TRN: US1901320
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 10; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; transmission coefficient; Maxwell equations; plasma flows; speed of sound; thermal conduction; plasma sheaths; plasma materials processing; plasma temperature; magnetic fields; plasma sources

Citation Formats

Tang, Xian-Zhu, and Guo, Zehua. Sheath energy transmission in a collisional plasma with collisionless sheath. United States: N. p., 2015. Web. doi:10.1063/1.4933415.
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Tang, Xian-Zhu, & Guo, Zehua. Sheath energy transmission in a collisional plasma with collisionless sheath. United States. https://doi.org/10.1063/1.4933415
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Tang, Xian-Zhu, and Guo, Zehua. Fri . "Sheath energy transmission in a collisional plasma with collisionless sheath". United States. https://doi.org/10.1063/1.4933415. https://www.osti.gov/servlets/purl/1457235.
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@article{osti_1457235,
title = {Sheath energy transmission in a collisional plasma with collisionless sheath},
author = {Tang, Xian-Zhu and Guo, Zehua},
abstractNote = {Sheath energy transmission governs the plasma energy exhaust onto a material surface. The ion channel is dominated by convection, but the electron channel has a significant thermal conduction component, which is dominated by the Knudsen layer effect in the presence of an absorbing wall. First-principle kinetic simulations also reveal a robustly supersonic sheath entry flow. The ion sheath energy transmission and the sheath potential are accurately predicted by a sheath model of truncated bi-Maxwellian electron distribution. The electron energy transmission is further enhanced by a parallel heat flux of the perpendicular degrees of freedom.},
doi = {10.1063/1.4933415},
journal = {Physics of Plasmas},
number = 10,
volume = 22,
place = {United States},
year = {Fri Oct 16 00:00:00 EDT 2015},
month = {Fri Oct 16 00:00:00 EDT 2015}
}
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Journal Article:
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https://doi.org/10.1063/1.4933415
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    Works referencing / citing this record:

    Critical role of electron heat flux on Bohm criterion
    journal, December 2016

    • Tang, Xian-Zhu; Guo, Zehua
    • Physics of Plasmas, Vol. 23, Issue 12
    • DOI: 10.1063/1.4971808

    Plasma Power Recycling at the Divertor Surface
    journal, January 2017

    • Tang, Xian-Zhu; Guo, Zehua
    • Fusion Science and Technology, Vol. 71, Issue 1
    • DOI: 10.13182/fst16-119
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