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Title: Particle-in-cell simulations of anomalous transport in a Penning discharge

Abstract

Electrostatic particle-in-cell simulations of a Penning discharge are performed in order to investigate azimuthally asymmetric, spoke-like structures previously observed in experiments. Two-dimensional simulations show that for Penning-discharge conditions, a persistent nonlinear spoke-like structure forms readily and rotates in the direction of E × B and electron diamagnetic drifts. The azimuthal velocity is within about a factor of 2 of the ion acoustic speed. The spoke frequency follows the experimentally observed scaling with ion mass, which indicates the importance of ion inertia in spoke formation. The spoke provides enhanced (anomalous) radial electron transport, and the effective cross-field conductivity is several times larger than the classical (collisional) value. The level of anomalous current obtained in the simulations is in good agreement with the experimental data. Furthermore, the rotating spoke channels most of the radial current, observable by an edge probe as short pulses.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [4]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Crow Radio and Plasma Science, Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Princeton Univ., Princeton, NJ (United States)
  4. Univ. of Saskatchewan, Saskatoon, SK (Canada)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1464518
Grant/Contract Number:  
FA9550-17-1- 0010
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 6; 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

Carlsson, Johan, Kaganovich, Igor, Powis, Andrew, Raitses, Yevgeny, Romadanov, Ivan, and Smolyakov, Andrei. Particle-in-cell simulations of anomalous transport in a Penning discharge. United States: N. p., 2018. Web. doi:10.1063/1.5017467.
Carlsson, Johan, Kaganovich, Igor, Powis, Andrew, Raitses, Yevgeny, Romadanov, Ivan, & Smolyakov, Andrei. Particle-in-cell simulations of anomalous transport in a Penning discharge. United States. doi:10.1063/1.5017467.
Carlsson, Johan, Kaganovich, Igor, Powis, Andrew, Raitses, Yevgeny, Romadanov, Ivan, and Smolyakov, Andrei. Tue . "Particle-in-cell simulations of anomalous transport in a Penning discharge". United States. doi:10.1063/1.5017467. https://www.osti.gov/servlets/purl/1464518.
@article{osti_1464518,
title = {Particle-in-cell simulations of anomalous transport in a Penning discharge},
author = {Carlsson, Johan and Kaganovich, Igor and Powis, Andrew and Raitses, Yevgeny and Romadanov, Ivan and Smolyakov, Andrei},
abstractNote = {Electrostatic particle-in-cell simulations of a Penning discharge are performed in order to investigate azimuthally asymmetric, spoke-like structures previously observed in experiments. Two-dimensional simulations show that for Penning-discharge conditions, a persistent nonlinear spoke-like structure forms readily and rotates in the direction of E × B and electron diamagnetic drifts. The azimuthal velocity is within about a factor of 2 of the ion acoustic speed. The spoke frequency follows the experimentally observed scaling with ion mass, which indicates the importance of ion inertia in spoke formation. The spoke provides enhanced (anomalous) radial electron transport, and the effective cross-field conductivity is several times larger than the classical (collisional) value. The level of anomalous current obtained in the simulations is in good agreement with the experimental data. Furthermore, the rotating spoke channels most of the radial current, observable by an edge probe as short pulses.},
doi = {10.1063/1.5017467},
journal = {Physics of Plasmas},
number = 6,
volume = 25,
place = {United States},
year = {2018},
month = {4}
}

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    Control of Coherent Structures via External Drive of the Breathing Mode
    journal, February 2019