Anticathode effect on electron kinetics in electron beam generated E × B plasma

Chopra, Nirbhav Singh; Romadanov, Ivan; Raitses, Yevgeny

doi:10.1088/1361-6595/ad8c7d

Title: Anticathode effect on electron kinetics in electron beam generated E × B plasma

Journal Article · 06 December 2024 · Plasma Sources Science and Technology

DOI: https://doi.org/10.1088/1361-6595/ad8c7d · OSTI ID:2479936

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Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
Princeton Univ., NJ (United States)

Electron beam (e-beam) generated plasmas with applied crossed electric and magnetic (E x B) fields are promising for low damage processing of materials with applications to microelectronics and quantum information systems. In cylindrical e-beam E x B plasmas, radial confinement of electrons and ions is achieved by an axial magnetic field and radial electric field, respectively. To control the axial confinement of electrons, such e-beam generated plasma sources may incorporate a conducting boundary known as an anticathode, which is placed on the axially opposite side of the plasma from the cathode. In this work, it is shown that varying the anticathode voltage bias can control the degree to which the anticathode collects or repels incident electrons, allowing control of warm electron (electron energies in 10–30 eV range) and beam electron population confinement. It is suggested that the effect of the anticathode bias on the formation of these distinct electron populations is also associated with the transition between weak turbulence and strong Langmuir turbulence.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: US Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2479936

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 12 Vol. 33; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
anticathode
electron beam
electron kinetics
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