Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field

Arthur, N. A.; Foster, J. E.; Barnat, E. V.

doi:10.1088/1361-6595/aac309

Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field

Journal Article · Tue May 08 00:00:00 EDT 2018 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/aac309· OSTI ID:1474090

^[1]; ^[1]; Barnat, E. V. ^[2]

Univ. of Michigan, Ann Arbor, MI (United States). Nuclear Engineering and Radiological Sciences
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

In this paper, two-dimensional electron density measurements are made in a magnetic ring cusp discharge using laser collisional induced fluorescence. The magnet rings are isolated from the anode structure such that they can be biased independently in order to modulate electron flows through the magnetic cusps. Electron density images are captured as a function of bias voltage in order to assess the effects of current flow through the cusp on the spatial extent of the cusp. We anticipated that for a fixed current density being funneled through the magnetic cusp, the leak width would necessarily increase. Unexpectedly, the leak width, as measured by LCIF images, does not increase. This suggests that the current density is not constant, and that possibly either electrons are being heated or additional ionization events are occurring within the cusp. Spatially resolving electron temperature would be needed to determine if electrons are being heated within the cusp. Finally, we also observe breakdown of the anode magnetosheath and formation of anode spots at high bias voltage.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27)

Grant/Contract Number:: NA0003525; SC0014664

OSTI ID:: 1474090

Alternate ID(s):: OSTI ID: 23001766

Report Number(s):: SAND--2018-10182J; 667942

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 5 Vol. 27; ISSN 1361-6595

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field

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