Loss cone effects and monotonic sheath conditions of a partially magnetized plasma sheath

Castillo, Andres M.; Hara, Kentaro

doi:10.1063/5.0187972

Loss cone effects and monotonic sheath conditions of a partially magnetized plasma sheath

Journal Article · Tue Mar 05 00:00:00 EST 2024 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0187972· OSTI ID:2567880

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Stanford University, CA (United States)

In this Letter, we propose the conditions for monotonic plasma sheaths adjacent to a floating wall in the presence of an applied, oblique magnetic field. The electron velocity distribution function (VDF) at the sheath edge obtained from a kinetic model exhibits a loss cone shaped truncation. Using an approximation of the truncated VDF, we derive an analytical framework of the sheath edge condition (i.e., Bohm condition), namely, the relation of ion injection velocity and sheath potential drop as a function of the magnetic field angle. The results show that the sheath edge velocity and total potential drop decrease for a steady-state sheath, which eventually collapses when the magnetic field lines become parallel to the wall.

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Research Organization:: Stanford University, CA (United States)

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

Grant/Contract Number:: SC0020623

OSTI ID:: 2567880

Alternate ID(s):: OSTI ID: 2479078

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 31; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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