Plasma and Fusion Research

Volume 12, 1403032 (2017)

Regular Articles

Analysis of Avalanche Runaway Generation after Disruptions with Low-Z and Noble Gas Species
Akinobu MATSUYAMA and Masatoshi YAGI
National Institutes for Quantum and Radiological Science and Technology, Rokkasho, Aomori 039-3212, Japan
(Received 22 February 2017 / Accepted 26 June 2017 / Published 7 August 2017)

Abstract

The effects of impurities on runaway electron generation are studied using a zero-dimensional disruption simulation code. For describing collisions between fast electrons and partially stripped ions, a charge-resolved expression of the Coulomb logarithm is employed. Numerical analysis of the avalanche growth rate using the adjoint Fokker-Planck method is compared with two existing semi-analytic models, showing (i) the convergence of the growth rate to strong electric field limit of the Rosenbluth-Putvinski (R-P) model and (ii) the cancellation of the effect of second-order collisional diffusion for intermediate electric fields. Using the developed current quench (CQ) simulations, the parametric study is performed with the aid of the power balance analysis, which characterizes the onset of strong avalanche amplification in the presence of low-Z and noble gas species. Thermal quench (TQ) simulations are also developed for self-consistent evaluation of hot-tail seed electrons. The deposition timescale of impurity neutrals is shown to have significant impacts on hot-tail seeds, depending non-monotonically on the pre-TQ temperature and the injected impurity density.

Keywords

runaway electron, disruption, massive gas injection, radiation, ITER

DOI: 10.1585/pfr.12.1403032

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