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Title: Scaling of spoke rotation frequency within a Penning discharge

Abstract

A rotating plasma spoke is shown to develop in two-dimensional full-sized kinetic simulations of a Penning discharge cross-section. Electron cross-field transport within the discharge is highly anomalous and correlates strongly with the spoke phase. Similarity between collisional and collisionless simulations demonstrates that ionization is not necessary for spoke formation. Parameter scans with discharge current Id, applied magnetic field strength B, and ion mass mi show that the spoke frequency scales with √ eErLn/mi, where Er is the radial electric field, Ln is the gradient length scale, and e is the fundamental charge. As a result, this scaling suggests that the spoke may develop as a non-linear phase of the collisionless Simon-Hoh instability.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of Saskatchewan, Saskatoon, SK (Canada)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1543871
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 7; 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; Physics

Citation Formats

Powis, Andrew T., Carlsson, Johan A., Kaganovich, Igor D., Raitses, Yevgeny, and Smolyakov, Andrei. Scaling of spoke rotation frequency within a Penning discharge. United States: N. p., 2018. Web. doi:10.1063/1.5038733.
Powis, Andrew T., Carlsson, Johan A., Kaganovich, Igor D., Raitses, Yevgeny, & Smolyakov, Andrei. Scaling of spoke rotation frequency within a Penning discharge. United States. doi:10.1063/1.5038733.
Powis, Andrew T., Carlsson, Johan A., Kaganovich, Igor D., Raitses, Yevgeny, and Smolyakov, Andrei. Thu . "Scaling of spoke rotation frequency within a Penning discharge". United States. doi:10.1063/1.5038733. https://www.osti.gov/servlets/purl/1543871.
@article{osti_1543871,
title = {Scaling of spoke rotation frequency within a Penning discharge},
author = {Powis, Andrew T. and Carlsson, Johan A. and Kaganovich, Igor D. and Raitses, Yevgeny and Smolyakov, Andrei},
abstractNote = {A rotating plasma spoke is shown to develop in two-dimensional full-sized kinetic simulations of a Penning discharge cross-section. Electron cross-field transport within the discharge is highly anomalous and correlates strongly with the spoke phase. Similarity between collisional and collisionless simulations demonstrates that ionization is not necessary for spoke formation. Parameter scans with discharge current Id, applied magnetic field strength B, and ion mass mi show that the spoke frequency scales with √eErLn/mi, where Er is the radial electric field, Ln is the gradient length scale, and e is the fundamental charge. As a result, this scaling suggests that the spoke may develop as a non-linear phase of the collisionless Simon-Hoh instability.},
doi = {10.1063/1.5038733},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}

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