Abstract
In order to control the plasma vertical stability of ITER, a novel magnet is developed, that is the vertical stability coil. The coil is located in the vacuum vessel and its safe operation is very important for ITER’s reliable working. During the normal operation, the coil should bear the electromagnetic force caused by the external superconducting magnet and plasma current. The electromagnetic load is one of the important factors to affect the lifetime of the VS coil. Therefore, it is necessary to calculate the magnetic field and evaluate the structural reliability under the electromagnetic load. In this paper, the current at the time “end of burn” was selected to perform the electromagnetic calculation. Based on the Maxwell equation, the magnetic field on the cross section of the upper VS coil was computed and the maximum electromagnetic force corresponding to the magnetic field was also presented. In order to verify the current design model, the finite element model was created by use of ANSYS. The Tresca stress was extracted and classified based on analytical design. The peak stress was compared with the ASME criteria. The analysis has verified the physical model from the perspective of electromagnetic load, and it will offer a guidance for the future optimization.
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