Diocotron modes in pure electron plasmas in the APEX levitating dipole trap

Deller, A.; Bayer, V. C.; Steinbrunner, P.; Card, A.; Danielson, J. R.; Stoneking, M. R.; Stenson, E. V.

doi:10.1088/1361-6587/ad9e70

Title: Diocotron modes in pure electron plasmas in the APEX levitating dipole trap

Journal Article · 27 December 2024 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/ad9e70 · OSTI ID:2497377

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Abstract Observations of persistent toroidal modes in dipole-trapped pure electron plasmas are presented. Non-neutral electron plasmas were confined by the poloidal magnetic field of the APEX (A Positron Electron eXperiment) levitating dipole trap. The negative bias of the electron emitter was gated to control the filling time. Large amplitude, narrow-band oscillations were consistently observed in wall probe measurements after the fill. The oscillatory image-charge currents induced by the trapped electron plasma typically persisted for many seconds with fundamental frequencies, f ₀ = 50 to 500 kHz, that scale with the $\vec{E} \times \vec{B}$ drift velocity. We attribute this feature to the dipole-equivalent of the diocotron mode that is commonly observed in non-neutral plasmas in linear traps.

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Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: SC0016532

OSTI ID:: 2497377

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 1 Vol. 67; ISSN 0741-3335

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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