Evaluation of heat generation caused by plasma disruption in superconductor of JT-60SA

Kizu, Kaname; Yoshida, Kiyoshi; Edaya, Masahiro; Tsuchiya, Katsuhiko; Matsukawa, Makoto; Ichige, Toshikatsu*

AC losses are generated in the CS and EF coils by the change of magnetic field and operational current caused by plasma disruption. It is required that the temperature margin for current sharing temperature has to be larger than 1 K even though the event of disruption. Thus, the heat evolution by disruption was evaluated as follows. At first, time evolution of current in coil, vacuum vessel, baffle plate, control coil and plasma was investigated by circuit analysis. Then, time evolution of magnetic field in each coil was calculated by the current pattern. Finally, AC losses were evaluated by the field pattern. It was found that the temperature increase of innermost turn in EF 1 coil becomes about 0.5 K. This indicates that the 1 K temperature margin is attained taking into account the temperature increase by standard plasma operational scenario.