Progress of the KSTAR tokamak engineering

The KSTAR tokamak is under construction with aim of establishing a scientific and technological basis for an attractive fusion reactor. The KSTAR tokamak system consists of a vacuum vessel, magnet systems, in-vessel components, a cryostat, thermal shields, a vacuum pumping system, and ancillary systems. These systems are in the final stage of engineering design and prototype manufacturing with industrial manufacturer's involvement. The extensive structural analyses of the vacuum vessel, cryostat and supporting structures have been performed. The prototype vacuum vessel of a full-scale 62-degree sector has been constructed to verify the overall fundamental characteristics of the developed manufacturing techniques. A prototype TF coil has been wound in D-shape without an internal joint and finished the heat treatment process. For magnet structures, final design modifications and extensive structural analyses have been carried out to maintain mechanical rigidity against electromagnetic forces for various operation scenarios. Substantial progress in engineering has been made on in-vessel components, thermal shields and vacuum pumping system.