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Wave form of current quench during disruptions in Tokamaks

トカマクのプラズマディスラプション時の電流減衰波形

杉原 正芳; Lukash, V.*; 河野 康則; 芳野 隆治; Gribov, Y.*; Khayrutdinov, R.*; 三木 信晴*; 大森 順次*; 嶋田 道也

Sugihara, Masayoshi; Lukash, V.*; Kawano, Yasunori; Yoshino, Ryuji; Gribov, Y.*; Khayrutdinov, R.*; Miki, Nobuharu*; Omori, Junji*; Shimada, Michiya

トカマクのプラズマディスラプション時の電流減衰波形に関して、JT-60の実験解析を行い、ITER設計の物理ガイドラインを導出した。速い電流減衰は指数関数的波形でよく表され、遅い電流減衰は直線的波形でよく表される。

The time dependence of the current decay during the current quench phase of disruptions, which can significantly influence the electro-magnetic force on the in-vessel components due to the induced eddy currents, is investigated using data obtained in JT-60U experiments in order to derive a relevant physics guideline for the predictive simulations of disruptions in ITER. It is shown that an exponential decay can fit the time dependence of current quench for discharges with large quench rate (fast current quench). On the other hand, for discharges with smaller quench rate (slow current quench), a linear decay can fit the time dependence of current quench better than exponential.

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