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Title: A fluid-kinetic framework for self-consistent runaway-electron simulations

Abstract

The problem of self-consistently coupling kinetic runaway-electron physics to the macroscopic evolution of the plasma is addressed by dividing the electron population into a bulk and a tail. A probabilistic closure is adopted to determine the coupling between the bulk and the tail populations, preserving them both as genuine, non-negative distribution functions. Here, macroscopic one-fluid equations and the kinetic equation for the runaway-electron population are then derived, now displaying sink and source terms due to transfer of electrons between the bulk and the tail.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1515691
Alternate Identifier(s):
OSTI ID: 1456262
Grant/Contract Number:  
[AC05-00OR22725; AC02-09CH11466; SC0016268]
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

Hirvijoki, Eero, Liu, Chang, Zhang, Guannan, del-Castillo-Negrete, Diego B., and Brennan, Dylan P. A fluid-kinetic framework for self-consistent runaway-electron simulations. United States: N. p., 2018. Web. doi:10.1063/1.5030424.
Hirvijoki, Eero, Liu, Chang, Zhang, Guannan, del-Castillo-Negrete, Diego B., & Brennan, Dylan P. A fluid-kinetic framework for self-consistent runaway-electron simulations. United States. doi:10.1063/1.5030424.
Hirvijoki, Eero, Liu, Chang, Zhang, Guannan, del-Castillo-Negrete, Diego B., and Brennan, Dylan P. Thu . "A fluid-kinetic framework for self-consistent runaway-electron simulations". United States. doi:10.1063/1.5030424. https://www.osti.gov/servlets/purl/1515691.
@article{osti_1515691,
title = {A fluid-kinetic framework for self-consistent runaway-electron simulations},
author = {Hirvijoki, Eero and Liu, Chang and Zhang, Guannan and del-Castillo-Negrete, Diego B. and Brennan, Dylan P.},
abstractNote = {The problem of self-consistently coupling kinetic runaway-electron physics to the macroscopic evolution of the plasma is addressed by dividing the electron population into a bulk and a tail. A probabilistic closure is adopted to determine the coupling between the bulk and the tail populations, preserving them both as genuine, non-negative distribution functions. Here, macroscopic one-fluid equations and the kinetic equation for the runaway-electron population are then derived, now displaying sink and source terms due to transfer of electrons between the bulk and the tail.},
doi = {10.1063/1.5030424},
journal = {Physics of Plasmas},
number = [6],
volume = [25],
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
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Figures / Tables:

FIG. 1 FIG. 1: Computation of 1-$Φ$ , i.e., the runaway probability, using the simplified 2D momentum space model for particle characteristics. For illustration purposes we fixed $τ$$r$ = 1, $t$ = 0.4 and changed $Z$ and $E$. The boundary in this case was assumed to be at $p$ = 4. Asmore » expected, for a fixed valued of $Z$, the runaway region increases with $E$. On the other hand, for fixed $E$, the runaway region decreases with increasing $Z$. The red color corresponds to $Φ$ = 0 (particles become runaways with certainty) while blue corresponds to $Φ$ = 1 (particles remain in the bulk). The implementation details regarding the evaluation of the Gaussian-weighted integrals can be found in Ref.30.« less

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