Runaway electron transport in stochastic toroidal magnetic fields
Abstract
Here, we study the transport and confinement properties of runaway electrons (RE) in the presence of magnetic fields with perturbations producing different levels of stochasticity. We use Kinetic Orbit Runaway Electron Code (KORC) [Carbajal et al., Phys. Plasmas 24, 042512 (2017) and del-Castillo-Negrete et al., Phys. Plasmas 25, 056104 (2018)] for simulating the full-orbit (FO) and guiding-center (GC) dynamics of RE in perturbed magnetic fields that exhibit magnetic islands. We extend previous works on this problem [Wingen et al., Nucl. Fusion 46, 941 (2006); Izzo et al., Nucl. Fusion 51, 063032 (2011); Papp et al., Nucl. Fusion 51, 043004 (2011); V. Izzo and P. Parks, Phys. Plasmas 24, 060705 (2017); and Sommariva et al., Nucl. Fusion 58, 016043 (2018)] by studying in detail full-orbit effects on the RE dynamics. We quantify FO effects on RE transport by performing one-to-one comparisons between FO and GC simulations. It is found that, for the magnetic field configurations considered, GC simulations predict twice the RE losses of FO simulations for 1 MeV and four times the RE losses of FO simulations for 25 MeV. Similarly, we show how different GC and FO dynamics of RE moving around magnetic islands can be, especially in themore »
- Authors:
-
[1];
[2];
[1]
- Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico). Inst. de Ciencias Nucleares
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Autonomous University of Mexico (UNAM)
- OSTI Identifier:
- 1649272
- Alternate Identifier(s):
- OSTI ID: 1603192
- Grant/Contract Number:
- AC05-00OR22725; IN11211S; LANCAD-UNAM-DGTIC-104
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 3; 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; plasma transport properties; kinetic theory; plasma confinement; tokamaks; stochastic processes; runaway electrons
Citation Formats
Carbajal, L., del-Castillo-Negrete, Diego, and Martinell, Julio J. Runaway electron transport in stochastic toroidal magnetic fields. United States: N. p., 2020.
Web. doi:10.1063/1.5135588.
Carbajal, L., del-Castillo-Negrete, Diego, & Martinell, Julio J. Runaway electron transport in stochastic toroidal magnetic fields. United States. https://doi.org/10.1063/1.5135588
Carbajal, L., del-Castillo-Negrete, Diego, and Martinell, Julio J. Thu .
"Runaway electron transport in stochastic toroidal magnetic fields". United States. https://doi.org/10.1063/1.5135588. https://www.osti.gov/servlets/purl/1649272.
@article{osti_1649272,
title = {Runaway electron transport in stochastic toroidal magnetic fields},
author = {Carbajal, L. and del-Castillo-Negrete, Diego and Martinell, Julio J.},
abstractNote = {Here, we study the transport and confinement properties of runaway electrons (RE) in the presence of magnetic fields with perturbations producing different levels of stochasticity. We use Kinetic Orbit Runaway Electron Code (KORC) [Carbajal et al., Phys. Plasmas 24, 042512 (2017) and del-Castillo-Negrete et al., Phys. Plasmas 25, 056104 (2018)] for simulating the full-orbit (FO) and guiding-center (GC) dynamics of RE in perturbed magnetic fields that exhibit magnetic islands. We extend previous works on this problem [Wingen et al., Nucl. Fusion 46, 941 (2006); Izzo et al., Nucl. Fusion 51, 063032 (2011); Papp et al., Nucl. Fusion 51, 043004 (2011); V. Izzo and P. Parks, Phys. Plasmas 24, 060705 (2017); and Sommariva et al., Nucl. Fusion 58, 016043 (2018)] by studying in detail full-orbit effects on the RE dynamics. We quantify FO effects on RE transport by performing one-to-one comparisons between FO and GC simulations. It is found that, for the magnetic field configurations considered, GC simulations predict twice the RE losses of FO simulations for 1 MeV and four times the RE losses of FO simulations for 25 MeV. Similarly, we show how different GC and FO dynamics of RE moving around magnetic islands can be, especially in the scenario where the RE Larmor radius is on the order of the size of the magnetic island. We also study the role of rotation of the magnetic islands on RE confinement, and we find that low-frequency toroidal rotation has no observable effect on RE transport in the cases considered. These results shed some light into the potential of avoidance or mitigation mechanisms based on magnetic perturbations.},
doi = {10.1063/1.5135588},
journal = {Physics of Plasmas},
number = 3,
volume = 27,
place = {United States},
year = {Thu Mar 05 00:00:00 EST 2020},
month = {Thu Mar 05 00:00:00 EST 2020}
}
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