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Sökning: WFRF:(Helander Per 1967)

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  • Fülöp, Tünde, 1970, et al. (författare)
  • Effect of plasma elongation on current dynamics during tokamak disruptions
  • 2020
  • Ingår i: Journal of Plasma Physics. - 0022-3778 .- 1469-7807. ; 86:1
  • Tidskriftsartikel (refereegranskat)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. © Cambridge University Press 2020.
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  • Fülöp, Tünde, 1970, et al. (författare)
  • Magnetic field threshold for runaway generation in tokamak disruptions
  • 2008
  • Ingår i: 35th European Physical Society Conference on Plasma Physics, EPS 2008 Combined with the 10th International Workshop on Fast Ignition of Fusion Targets; Hersonissos, Crete; Greece; 9 June 2008 through 13 June 2008. - 9781622763351 ; 32:2, s. 1014-1017
  • Konferensbidrag (refereegranskat)abstract
    • Experimental observations on large tokamaks show that the number of runaway electrons produced in disruptions depends sensitively on the magnetic field strength. The presence of a whistler wave instability (WWI) excited by runaway electrons may be the reason for this observation since the linear growth rates of these waves are such that they are stable for high magnetic field (so the runaway beam can form) but unstable for low magnetic field. The quasi-linear diffusion process due to the WWI represents a very efficient pitch-angle scattering mechanism for runaways and consequently may stop runaway beam formation. In this work, the criterion for runaway suppression by WWI is compared with a criterion for substantial runaway production obtained by calculating how many runaway electrons can be produced before the induced toroidal electric field diffuses out of the plasma.
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  • Resultat 1-10 av 27

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