Sheath energy transmission in a collisional plasma with collisionless sheath

Tang, Xian-Zhu; Guo, Zehua

doi:10.1063/1.4933415

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

Journal Article · Fri Oct 16 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4933415· OSTI ID:1457235

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1457235

Alternate ID(s):: OSTI ID: 1224222

Report Number(s):: LA-UR-15-22389; PHPAEN; TRN: US1901320

Journal Information:: Physics of Plasmas, Vol. 22, Issue 10; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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Numerical analysis of ion temperature effects to the plasma wall transition using a one-dimensional two-fluid model. I. Finite Debye to ionization length ratio Gyergyek, T.; Kovačič, J. Physics of Plasmas, Vol. 24, Issue 6 https://doi.org/10.1063/1.4984786	journal	June 2017
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Title: Sheath energy transmission in a collisional plasma with collisionless sheath

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