Boundary-induced effect on the spoke-like activity in E × B plasma

Rodríguez, Eduardo; Skoutnev, V.; Raitses, Y.; Powis, A.; Kaganovich, I.; Smolyakov, A.

doi:10.1063/1.5092702

Title: Boundary-induced effect on the spoke-like activity in E × B plasma

Journal Article · 07 May 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5092702 · OSTI ID:1558788

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Saskachewan, Saskatoon, SK(Canada)

The spoke instability in an E × B Penning discharge is shown to be strongly affected by the boundary that is perpendicular to B field lines. The instability is the strongest when bounded by dielectric walls. With a conducting wall, biased to collect electron current from the plasma, the spoke becomes faster, less coherent, and localized closer to the axis. The corresponding anomalous cross-field transport is assessed via simultaneous time-resolved measurements of plasma potential and density. Here, this shows a dominant large-scale E × B anomalous character of the electron cross-field current for dielectric walls reaching 40%–100% of the discharge current, with an effective Hall parameter β_eff ~10. The anomalous current is greatly reduced with the conducting boundary (characterized by β_eff ~ 10²). These experimental measurements are shown to be qualitatively consistent with the decrease in the E field that triggers the collisionless Simon-Hoh instability.

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

Sponsoring Organization:: USDOE

Contributing Organization:: This work was supported by the Air Force Office of Scientific Research (AFOSR).

OSTI ID:: 1558788

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 26; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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