Detailed Analysis of the Dynamic Behavior of the JT-60 Vacuum Vessel under the Saddle-Like Electromagnetic Forces

摘要

Dynamic response analyses of the vacuum vessel of JT-60 were carried out under three kinds of saddle-like electromagnetic forces. In the analysis, the dynamic response of the bellows was obtained by dividing it into three components; the first caused by the forced deflection due to the displacement of the adjacent rigid ring, the second caused by the inertia force and the third caused by the saddle-like electromagnetic force. Eigenvalue analyses showed that the typical rotation mode of the rigid ring around the major radius is found at the 20th with the natural frequency of 46.3 Hz. And from the results of the dynamic response analyses, it was shown that the maximum displacement response of the rigid ring is 3.1 mm and the dynamic response is remarkable in case of plasma disruption with time constant of 1 msec. In cases of start-up and plasma disruption with time constant of 50 msec, the rigid ring vibrates quasi-statically. (Atomindex citation 13:643423)