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Title: Scaling of spoke rotation frequency within a Penning discharge

Journal Article · · Physics of Plasmas
DOI: https://doi.org/10.1063/1.5038733 · OSTI ID:1543871

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1543871
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 25; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Fast sweeping probe system for characterization of spokes in E × B discharges journal December 2018
Boundary-induced effect on the spoke-like activity in E  ×  B plasma journal May 2019
Boundary-induced effect on the spoke-like activity in ExB plasma text January 2019
Self-Organization, Structures, and Anomalous Transport in Turbulent Partially Magnetized Plasmas with Crossed Electric and Magnetic Fields journal May 2019
An overview of discharge plasma modeling for Hall effect thrusters journal April 2019
Micro instabilities and rotating spokes in the near-anode region of partially magnetized plasmas journal July 2019