Transport physics dependence of Bohm speed in presheath–sheath transition

Li, Yuzhi; Srinivasan, Bhuvana; Zhang, Yanzeng; Tang, Xian-Zhu

doi:10.1063/5.0110379

Transport physics dependence of Bohm speed in presheath–sheath transition

Journal Article · Tue Nov 08 00:00:00 EST 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0110379· OSTI ID:1907779

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Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

We report the ion exit flow speed at the sheath entrance is constrained by the Bohm criterion, which is used as a boundary condition for simulations that do not resolve the sheath region. Traditional Bohm criterion analysis invokes the equation of state and, thus, ignores transport physics in the sheath transition problem. An expression for the Bohm speed away from the asymptotic limit is derived from a set of anisotropic plasma transport equations. The thermal force, collisional temperature isotropization, and heat flux enter into the evaluation of the Bohm speed. By comparison with kinetic simulation results, this expression is shown to be accurate in the presheath–sheath transition region rather than a single point at the sheath entrance over a broad range of collisionality.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: 89233218CNA000001; AC02-05CH11231; SC0018276

OSTI ID:: 1907779

Alternate ID(s):: OSTI ID: 1897304
OSTI ID: 2228512

Report Number(s):: LA-UR--22-26588

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 29; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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