Influence of magnetic angle on the E × B drift in a magnetic presheath

Caron, D.; Scime, E. E.

doi:10.1063/5.0046708

Influence of magnetic angle on the E × B drift in a magnetic presheath

Journal Article · Mon Aug 09 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0046708· OSTI ID:1853558

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West Virginia University, Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States)
West Virginia University, Morgantown, WV (United States)

In this work, we provide experimental measurements of the E X B flow above a non-magnetic, absorbing boundary in a magnetized plasma. Measurements are taken as a function of the angle between the background magnetic field and the boundary normal. The measurements are compared to computational predictions for oblique magnetic fields based on Chodura's model. Ion flow measurements were obtained with laser induced fluorescence and the presheath potential structure was measured with an emissive probe. The ions were found to accelerate to nearly 30% of the sound speed parallel to the boundary at oblique angles of the magnetic field (~80°) and the ion speed at the electrostatic sheath edge was found to decrease with angle. The edge of the magnetic presheath has been experimentally determined based on the appearance of the E X B drift and is found to be independent of the angle of the magnetic field. We also demonstrate that laser induced fluorescence is suitable as a non-perturbative diagnostic to measure the electric field in a magnetized sheath.

View Accepted Manuscript (DOE)

Research Organization:: West Virginia University, Morgantown, WV (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0020294

OSTI ID:: 1853558

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 28; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Influence of magnetic angle on the E × B drift in a magnetic presheath

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