Effect of plasma elongation on current dynamics during tokamak disruptions. (February 2020)

• Record Type: Journal Article
• Authors: Fülöp, T.; Helander, P.; Vallhagen, O.; Embreus, O.; Hesslow, L.; Svensson, P.; Creely, A. J.; Howard, N. T.; Rodriguez-Fernandez, P.
• Is Part Of: Journal of plasma physics. Volume 86:Number 1(2020)
• Publication Date: 2020-02
• Subjects: fusion plasma, -- runaway electrons; Plasma (Ionized gases) -- Periodicals; 530.4405
• DOI: 10.1017/S002237782000001X
• Languages: English
• ISSNs: 0022-3778

Abstract

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.