Plasma and Fusion Research

Volume 1, 016 (2006)

Regular Articles

Modeling of Plasma Current Decay during Disruptions Caused by Massive Impurity Injection
Hirokazu OHWAKI, Masayoshi SUGIHARA1) and Akiyoshi HATAYAMA
Keio University
1)
ITER International Team, Naka JWS
(Received 14 March 2005 / Accepted 20 January 2006 / Published 28 March 2006)

Abstract

A numerical model is developed to evaluate the decay time of plasma current during the disruption following intense impurity injections. Our model is based on the power balance equation between joule heating and impurity radiation as a way to evaluate the electron temperature and charge state after the thermal quench. The model is applied to the experimental results of massive N2 gas injections in JFT-2M, which simulate the “ingress-of-coolant event” (ICE) as well as disruption mitigations in ITER. It is confirmed that the model can reproduce the experiments reasonably well.

Keywords

disruption, current decay time, impurity radiation, mitigation, tokamak

DOI: 10.1585/pfr.1.016

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This paper may be cited as follows:

Hirokazu OHWAKI, Masayoshi SUGIHARA and Akiyoshi HATAYAMA, Plasma Fusion Res. 1, 016 (2006).