Boundary-induced effect on the spoke-like activity in E × B plasma
Abstract
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 βeff ~10. The anomalous current is greatly reduced with the conducting boundary (characterized by βeff ~ 102). These experimental measurements are shown to be qualitatively consistent with the decrease in the E field that triggers the collisionless Simon-Hoh instability.
- Authors:
-
[1];
[1];
[1];
[1];
[2]
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of Saskachewan, Saskatoon, SK(Canada)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- This work was supported by the Air Force Office of Scientific Research (AFOSR).
- OSTI Identifier:
- 1558788
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Rodríguez, Eduardo, Skoutnev, V., Raitses, Y., Powis, A., Kaganovich, I., and Smolyakov, A. Boundary-induced effect on the spoke-like activity in E × B plasma. United States: N. p., 2019.
Web. doi:10.1063/1.5092702.
Rodríguez, Eduardo, Skoutnev, V., Raitses, Y., Powis, A., Kaganovich, I., & Smolyakov, A. Boundary-induced effect on the spoke-like activity in E × B plasma. United States. https://doi.org/10.1063/1.5092702
Rodríguez, Eduardo, Skoutnev, V., Raitses, Y., Powis, A., Kaganovich, I., and Smolyakov, A. Tue .
"Boundary-induced effect on the spoke-like activity in E × B plasma". United States. https://doi.org/10.1063/1.5092702. https://www.osti.gov/servlets/purl/1558788.
@article{osti_1558788,
title = {Boundary-induced effect on the spoke-like activity in E × B plasma},
author = {Rodríguez, Eduardo and Skoutnev, V. and Raitses, Y. and Powis, A. and Kaganovich, I. and Smolyakov, A.},
abstractNote = {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 βeff ~10. The anomalous current is greatly reduced with the conducting boundary (characterized by βeff ~ 102). These experimental measurements are shown to be qualitatively consistent with the decrease in the E field that triggers the collisionless Simon-Hoh instability.},
doi = {10.1063/1.5092702},
journal = {Physics of Plasmas},
number = 5,
volume = 26,
place = {United States},
year = {2019},
month = {5}
}
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