Effect of plasma elongation on current dynamics during tokamak disruptions

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.

11 pages, 3 figures

References in corpus (4)

• Influence of massive material injection on avalanche runaway generation during tokamak disruptions
• Numerical calculation of the runaway electron distribution function and associated synchrotron emission
• The effect of ITER-like wall on runaway electron generation in JET
• Evaluation of the Dreicer runaway generation rate in the presence of high-Z impurities using a neural network

Cited by in corpus (1)

• Evaluation of the Dreicer runaway generation rate in the presence of high-Z impurities using a neural network