Theoretical Coupling of Free-Flowing Ions and Magnetically Insulated Electrons

Darr, Adam M.; Cartwright, Keith L.

doi:10.1103/physrevlett.133.245001

Title: Theoretical Coupling of Free-Flowing Ions and Magnetically Insulated Electrons

Journal Article · 13 December 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.133.245001 · OSTI ID:2481179

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Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Magnetic insulation of electrons prevents losses and can be applied to generating radiation or electron sources for high current and high power applications. Ion emission from the anode may degrade magnetic insulation. We develop equilibrium theory, self-consistently coupling magnetically insulated electron flow with free-flowing injected ions. Generally, ion injection is self-limiting from space charge; however, once insulation strength drops below about 1.2x the magnetic insulation threshold, ion space-charge limits vanish. Further, the gap effectively short-circuits and the electron flow layer asymptotically approaches the anode. In this regime a quasineutral, nonthermal plasma manifests, effectively reducing gap distance and suggesting quasiequilibrium gap closure evolution.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: NA0003525

OSTI ID:: 2481179

Report Number(s):: SAND--2024-16745J

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 133; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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