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Title: Phase-space dynamics of runaway electrons in magnetic fields

Abstract

Dynamics of runaway electrons in magnetic fields are governed by the competition of three dominant physics: parallel electric field acceleration, Coulomb collision, and synchrotron radiation. Examination of the energy and pitch-angle flows reveals that the presence of local vortex structure and global circulation is crucial to the saturation of primary runaway electrons. Models for the vortex structure, which has an O-point to X-point connection, and the bump of runaway electron distribution in energy space have been developed and compared against the simulation data. Lastly, identification of these velocity-space structures opens a new venue to re-examine the conventional understanding of runaway electron dynamics in magnetic fields.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1364543
Report Number(s):
LA-UR-16-26162
Journal ID: ISSN 0741-3335
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Magnetic Fusion Energy; runaway electron; synchrotron radiation; phase space

Citation Formats

Guo, Zehua, McDevitt, Christopher Joseph, and Tang, Xian-Zhu. Phase-space dynamics of runaway electrons in magnetic fields. United States: N. p., 2017. Web. doi:10.1088/1361-6587/aa5952.
Guo, Zehua, McDevitt, Christopher Joseph, & Tang, Xian-Zhu. Phase-space dynamics of runaway electrons in magnetic fields. United States. doi:10.1088/1361-6587/aa5952.
Guo, Zehua, McDevitt, Christopher Joseph, and Tang, Xian-Zhu. Thu . "Phase-space dynamics of runaway electrons in magnetic fields". United States. doi:10.1088/1361-6587/aa5952. https://www.osti.gov/servlets/purl/1364543.
@article{osti_1364543,
title = {Phase-space dynamics of runaway electrons in magnetic fields},
author = {Guo, Zehua and McDevitt, Christopher Joseph and Tang, Xian-Zhu},
abstractNote = {Dynamics of runaway electrons in magnetic fields are governed by the competition of three dominant physics: parallel electric field acceleration, Coulomb collision, and synchrotron radiation. Examination of the energy and pitch-angle flows reveals that the presence of local vortex structure and global circulation is crucial to the saturation of primary runaway electrons. Models for the vortex structure, which has an O-point to X-point connection, and the bump of runaway electron distribution in energy space have been developed and compared against the simulation data. Lastly, identification of these velocity-space structures opens a new venue to re-examine the conventional understanding of runaway electron dynamics in magnetic fields.},
doi = {10.1088/1361-6587/aa5952},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 59,
place = {United States},
year = {Thu Feb 16 00:00:00 EST 2017},
month = {Thu Feb 16 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 4 works
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