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Title: New mechanism of runaway electron diffusion due to microturbulence in tokamaks

Abstract

Chaotic transport of runaway electrons in a toroidal system in the presence of a weak small-scale magnetic turbulent field with a wide mode spectrum is studied. Using a fast running mapping, the radial profiles of turbulent diffusion coefficients are calculated. It is found that at large Kubo numbers the chaotic transport of the electrons is described by a fractal-like radial dependence of the diffusion coefficients with reduced or zero values near low-order rational drift surfaces which form transport barriers. The latter can be one of the main reasons of the improved confinement of runaway electrons in tokamaks. One can expect that this effect may lead to the formation of the nested beams of runaway electrons.

Authors:
 [1];  [1];  [2]
  1. Institute for Energy and Climate Research-Plasma Physics, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, Partner in the Trilateral Euregio Cluster, D-52425 Juelich (Germany)
  2. Institut fuer Laser und Plasmaphysik, Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstr.1, 40225 Duesseldorf (Germany)
Publication Date:
OSTI Identifier:
22072565
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 7; Other Information: (c) 2012 Euratom; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAMS; CHAOS THEORY; DIFFUSION; FRACTALS; PLASMA CONFINEMENT; RUNAWAY ELECTRONS; SPECTRA; SURFACES; TOKAMAK DEVICES; TURBULENCE

Citation Formats

Abdullaev, S S, Finken, K H, Institut fuer Laser und Plasmaphysik, Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstr.1, 40225 Duesseldorf, and Forster, M. New mechanism of runaway electron diffusion due to microturbulence in tokamaks. United States: N. p., 2012. Web. doi:10.1063/1.4736718.
Abdullaev, S S, Finken, K H, Institut fuer Laser und Plasmaphysik, Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstr.1, 40225 Duesseldorf, & Forster, M. New mechanism of runaway electron diffusion due to microturbulence in tokamaks. United States. https://doi.org/10.1063/1.4736718
Abdullaev, S S, Finken, K H, Institut fuer Laser und Plasmaphysik, Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstr.1, 40225 Duesseldorf, and Forster, M. 2012. "New mechanism of runaway electron diffusion due to microturbulence in tokamaks". United States. https://doi.org/10.1063/1.4736718.
@article{osti_22072565,
title = {New mechanism of runaway electron diffusion due to microturbulence in tokamaks},
author = {Abdullaev, S S and Finken, K H and Institut fuer Laser und Plasmaphysik, Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstr.1, 40225 Duesseldorf and Forster, M},
abstractNote = {Chaotic transport of runaway electrons in a toroidal system in the presence of a weak small-scale magnetic turbulent field with a wide mode spectrum is studied. Using a fast running mapping, the radial profiles of turbulent diffusion coefficients are calculated. It is found that at large Kubo numbers the chaotic transport of the electrons is described by a fractal-like radial dependence of the diffusion coefficients with reduced or zero values near low-order rational drift surfaces which form transport barriers. The latter can be one of the main reasons of the improved confinement of runaway electrons in tokamaks. One can expect that this effect may lead to the formation of the nested beams of runaway electrons.},
doi = {10.1063/1.4736718},
url = {https://www.osti.gov/biblio/22072565}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 19,
place = {United States},
year = {Sun Jul 15 00:00:00 EDT 2012},
month = {Sun Jul 15 00:00:00 EDT 2012}
}