Experimental Observation of a Magnetic-Turbulence Threshold for Runaway-Electron Generation in the TEXTOR Tokamak

L. Zeng, H. R. Koslowski, Y. Liang, A. Lvovskiy, M. Lehnen, D. Nicolai, J. Pearson, M. Rack, H. Jaegers, K. H. Finken, K. Wongrach, Y. Xu, and the TEXTOR team
Phys. Rev. Lett. 110, 235003 – Published 5 June 2013

Abstract

Magnetic turbulence is observed at the beginning of the current quench in intended TEXTOR disruptions. Runaway electron (RE) suppression has been experimentally found at magnetic turbulence larger than a certain threshold. Below this threshold, the generated RE current is inversely proportional to the level of magnetic turbulence. The magnetic turbulence originates from the background plasma and the amplitude depends strongly on the toroidal magnetic field and plasma electron density. These results explain the previously found toroidal field threshold for RE generation and have to be considered in predictions for RE generation in ITER.

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  • Received 22 March 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.235003

© 2013 American Physical Society

Authors & Affiliations

L. Zeng1,2, H. R. Koslowski1, Y. Liang1, A. Lvovskiy1, M. Lehnen1,3, D. Nicolai1, J. Pearson1, M. Rack1, H. Jaegers1, K. H. Finken4, K. Wongrach4, Y. Xu5, and the TEXTOR team

  • 1Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research—Plasma Physics (IEK-4), Association EURATOM-FZJ, Trilateral Euregio Cluster, 52425 Jülich, Germany
  • 2Institute of Plasma Physics, Chinese Academy of Sciences, 230031 Hefei, China
  • 3ITER Organization, Route de Vinon sur Verdon, 13115 St Paul Lez Durance, France
  • 4Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
  • 5Laboratoire de Physique des Plasmas—Laboratorium voor Plasmafysica, Association ‘Euratom-Belgian state’, Ecole Royale Militaire—Koninklijke Militaire School, Trilateral Euregio Cluster, 1000 Brussels, Belgium

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Vol. 110, Iss. 23 — 7 June 2013

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