Relation of the runaway avalanche threshold to momentum space topology
Abstract
Here, the underlying physics responsible for the formation of an avalanche instability due to the generation of secondary electrons is studied. A careful examination of the momentum space topology of the runaway electron population is carried out with an eye toward identifying how qualitative changes in the momentum space of the runaway electrons is correlated with the avalanche threshold. It is found that the avalanche threshold is tied to the merger of an O and X point in the momentum space of the primary runaway electron population. Such a change of the momentum space topology is shown to be accurately described by a simple analytic model, thus providing a powerful means of determining the avalanche threshold for a range of model assumptions.
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1417822
- Report Number(s):
- LA-UR-17-28349
Journal ID: ISSN 0741-3335
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 2; 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
Citation Formats
McDevitt, Christopher J., Guo, Zehua, and Tang, Xian -Zhu. Relation of the runaway avalanche threshold to momentum space topology. United States: N. p., 2018.
Web. doi:10.1088/1361-6587/aa9b3f.
McDevitt, Christopher J., Guo, Zehua, & Tang, Xian -Zhu. Relation of the runaway avalanche threshold to momentum space topology. United States. https://doi.org/10.1088/1361-6587/aa9b3f
McDevitt, Christopher J., Guo, Zehua, and Tang, Xian -Zhu. Fri .
"Relation of the runaway avalanche threshold to momentum space topology". United States. https://doi.org/10.1088/1361-6587/aa9b3f. https://www.osti.gov/servlets/purl/1417822.
@article{osti_1417822,
title = {Relation of the runaway avalanche threshold to momentum space topology},
author = {McDevitt, Christopher J. and Guo, Zehua and Tang, Xian -Zhu},
abstractNote = {Here, the underlying physics responsible for the formation of an avalanche instability due to the generation of secondary electrons is studied. A careful examination of the momentum space topology of the runaway electron population is carried out with an eye toward identifying how qualitative changes in the momentum space of the runaway electrons is correlated with the avalanche threshold. It is found that the avalanche threshold is tied to the merger of an O and X point in the momentum space of the primary runaway electron population. Such a change of the momentum space topology is shown to be accurately described by a simple analytic model, thus providing a powerful means of determining the avalanche threshold for a range of model assumptions.},
doi = {10.1088/1361-6587/aa9b3f},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 60,
place = {United States},
year = {2018},
month = {1}
}
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Works referencing / citing this record:
Spatial transport of runaway electrons in axisymmetric tokamak plasmas
journal, January 2019
- McDevitt, Christopher J.; Guo, Zehua; Tang, Xian-Zhu
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 2
Avalanche mechanism for runaway electron amplification in a tokamak plasma
journal, April 2019
- McDevitt, Christopher J.; Guo, Zehua; Tang, Xian-Zhu
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 5
Physics of runaway electrons in tokamaks
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