Bohm Criterion of Plasma Sheaths away from Asymptotic Limits

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

doi:10.1103/physrevlett.128.085002

Bohm Criterion of Plasma Sheaths away from Asymptotic Limits

Journal Article · Wed Feb 23 00:00:00 EST 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.128.085002· OSTI ID:1874178

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Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The plasma exit flow speed at the sheath entrance is constrained by the Bohm criterion. The so-called Bohm speed regulates the plasma particle and power exhaust fluxes to the wall, and it is commonly deployed as a boundary condition to exclude the sheath region in quasineutral plasma modeling. In this work, the Bohm criterion analysis is performed in the intermediate plasma regime away from the previously known limiting cases of adiabatic laws and the asymptotic limit of infinitesimal Debye length in a finite-size system, using the transport equations of an anisotropic plasma. The resulting Bohm speed has explicit dependence on local plasma heat flux, temperature isotropization, and thermal force. Comparison with kinetic simulations demonstrates its accuracy over the plasma-sheath transition region in which quasineutrality is weakly perturbed and the Bohm criterion applies.

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 Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC). Fusion Energy Sciences (FES)

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

OSTI ID:: 1874178

Report Number(s):: LA-UR-21-20765

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 128; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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