S.Y. Cho, J. Kim, H.S. Kim, G.S. Lee, S.G. Lee, H.K. Park,
Korea Basic Science Institute, 52 Yeoeun-Dong, Yusung-Ku, Taejeon, 305-333, KOREA
W. Reiersen, F. Dahlgren,
Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, NJ 08543, USA
T. Brown,
Grumman Systems, 4 Independence Way, Princeton, NJ 08540, USA
and the KSTAR Team
The Korea Superconducting Tokamak Advanced Research (KSTAR) is a steady-state-capable superconducting tokamak. The vacuum vessel system consists of the toroidal vessel inner and outer shells, all ports and vacuum boundary closures, vessel supports, passive plates and their supports. The vessel shape is designed to simplify fabrication such that two cylindrical sections in the middle of inboard/outboard region, conic sections in the top/bottom of outboard region and spin-formed circular sections in the top/bottom of inboard region. The vessel is a double wall design with inner and outer shells separated by ribs and filled with shielding water. SS316 is chosen as the vessel structure material for domestic availability and cost effectiveness. There are 8 identical major horizontal ports for heating/current drive system, diagnostics, pumping and access.
Since vacuum vessel ought to support all other major components of the machine, say, plasma facing components, ports connected to the cryostat and magnets, a comprehensive analytical effort needs to be established to perform the structural analysis of the vacuum vessel with appropriate boundary conditions. The structural analysis using ANSYS code includes the effects of the major loads: dead weight, shielding water, atmospheric pressure, seismic load, and electromagnetic (EM) load resulting from engineering plasma disruption scenarios. EM load has been identified as the principal contributor to the combined vacuum vessel response.
* Work supported by the Ministry of Science and Technology of the Republic of Korea