How sheath properties change with gas pressure: modeling and simulation

Beving, L. P.; Hopkins, M. M.; Baalrud, S. D.

doi:10.1088/1361-6595/ac85d7

How sheath properties change with gas pressure: modeling and simulation

Journal Article · Tue Aug 30 00:00:00 EDT 2022 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/ac85d7· OSTI ID:1883627

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Abstract

Particle-in-cell simulations are used to study how neutral pressure influences plasma properties at the sheath edge. The high rate of ion–neutral collisions at pressures above several mTorr are found to cause a decrease in the ion velocity at the sheath edge (collisional Bohm criterion), a decrease in the edge-to-center density ratio ( h _l factor), and an increase in the sheath width and sheath potential drop. A comparison with existing analytic models generally indicates favorable agreement, but with some distinctions. One is that models for the h _l factor need to be made consistent with the collisional Bohm criterion. With this and similar corrections, a comprehensive fluid-based model of the plasma boundary transition is constructed that compares well with the simulation results.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: NA0003525; SC0022201

OSTI ID:: 1883627

Alternate ID(s):: OSTI ID: 1888550
OSTI ID: 1907099

Report Number(s):: SAND2022-10692J

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 8 Vol. 31; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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