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Effect of plasma elongation on current dynamics during tokamak disruptions

  • T. Fülöp (a1), P. Helander (a2), O. Vallhagen (a1), O. Embreus (a1), L. Hesslow (a1), P. Svensson (a1), A. J. Creely (a3), N. T. Howard (a4) and P. Rodriguez-Fernandez (a4)...

Abstract

Plasma terminating disruptions in tokamaks may result in relativistic runaway electron beams with potentially serious consequences for future devices with large plasma currents. In this paper, we investigate the effect of plasma elongation on the coupled dynamics of runaway generation and resistive diffusion of the electric field. We find that elongated plasmas are less likely to produce large runaway currents, partly due to the lower induced electric fields associated with larger plasmas, and partly due to direct shaping effects, which mainly lead to a reduction in the runaway avalanche gain.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Email address for correspondence: tunde@chalmers.se

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Keywords

Effect of plasma elongation on current dynamics during tokamak disruptions

  • T. Fülöp (a1), P. Helander (a2), O. Vallhagen (a1), O. Embreus (a1), L. Hesslow (a1), P. Svensson (a1), A. J. Creely (a3), N. T. Howard (a4) and P. Rodriguez-Fernandez (a4)...

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